US5473448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device having a mesomorphic diffraction grating layer adjacent a polymer dispersed layer
Assignee: Canon Inc
•
Filing: 1995-03-21
•
Granted: 1995-12-05
•
Expires: 2015-03-21
Abstract
Abstract A display device is constituted by disposing a first display layer and a second display layer between a pair of electrode plates including at least one transparent electrode plate. The first display layer contains a low-molecular weight mesomorphic compound dispersed in or impregnating a polymer matrix. The second display layer is formed by disposing a diffraction grating and being filled with the low-molecular weight mesomorphic compound. The display device is incorporated in a display apparatus to effect a good display with a high contrast ratio.
Inventors
- 👤 Kazuo Yoshinaga
- 👤 Hajime Sakata
- 👤 Yomishi Toshida
- 👤 Toshikazu Ohnishi
- 👤 Koichi Sato
- 👤 Takeo Eguchi
- 👤 Tsuyoshi Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:36
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/542; C09K19/544; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13476; G02F1/1334; G02F2201/00; G02F2201/30; G02F2201/305
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
77 words
A display device, comprising: a pair of electrode plates each comprising a substrate and an electrode thereon including at least one substrate having thereon a transparent electrode, and a first display layer and a second display layer disposed between the electrode plates; wherein said first display layer comprises a polymer matrix and a low-molecular weight mesomorphic compound dispersed in the polymer matrix, and said second display layer comprises a diffraction grating and a low-molecular weight mesomorphic compound.
Claim 2
Dependent Claim
77 words
A display device, comprising: a pair of electrode plates each comprising a substrate and an electrode thereon including at least one substrate having thereon a transparent electrode, and a first display layer and a second display layer disposed between the electrode plates; wherein said first display layer comprises a polymer matrix and a low-molecular weight mesomorphic compound dispersed in the polymer matrix, and said second display layer comprises a diffraction grating and a low-molecular weight mesomorphic compound.
Claim 3
Dependent Claim
20 words
A display device according to claim 1, wherein said diffraction grating has a grating constant of 0.8 to 10 microns.
Claim 4
Dependent Claim
19 words
A display device according to claim 1, wherein said polymer matrix comprises a porous polymer film having open pores.
Claim 5
Dependent Claim
15 words
A display device according to claim 1, wherein said diffraction grating has a two-dimensional form.
Claim 6
Dependent Claim
23 words
A display device according to claim 1, wherein said low-molecular weight mesomorphic compound in said first display layer comprises a nematic liquid crystal.
Claim 7
Dependent Claim
24 words
A display device according to claim 1, wherein said low-molecular weight mesomorphic compound in said first display layer comprises a chiral smectic mesomorphic compound.
Claim 8
Dependent Claim
24 words
A display device according to claim 1, wherein said low-molecular weight mesomorphic compound in said first display layer comprises a non-chiral smectic mesomorphic compound.
Claim 9
Dependent Claim
23 words
A display device according to claim 1, wherein said low-molecular weight mesomorphic compound in said second display layer comprises a nematic liquid crystal.
Claim 10
Dependent Claim
41 words
A display device according to claim 1, further comprising a third display layer, said third molecular layer comprising a diffraction grating and a low-molecular weight mesomorphic compound, wherein said first display layer is disposed between said second and third display layers.
Claim 11
Dependent Claim
34 words
A display device according to claim 9, wherein each of said two diffraction gratings have a stripe shape including lines and spaces, and are disposed such that their stripes are perpendicular to each other.
Claim 12
Dependent Claim
19 words
A display device according to claim 1, wherein said diffraction grating has a stripe shape including lines and spaces.
Claim 13
Dependent Claim
45 words
A display apparatus, including: a display device according to any one of claims 1-5; means for applying voltage to said display device; means for illuminating said display device with light; means for projecting transmitted light passed through said display device onto a projection image-receiving member.
Claim 14
Dependent Claim
39 words
A display method, comprising: illuminating a display device according to any one of claims 1-5 with light; applying voltage to said display device; and projecting transmitted light obtained by passing said light through said display device to effect display.
Claim 15
Dependent Claim
142 words
A display apparatus, including: a display device, comprising: a pair of electrode plates each comprising a substrate and an electrode thereon including at least one substrate having thereon a transparent electrode, and a first display layer and a second display layer disposed between the electrode plates; wherein said first display layer comprises a polymer matrix and a low-molecular weight mesomorphic compound dispersed in the polymer matrix, and said second display layer comprises a diffraction grating and a low-molecular weight mesomorphic compound; means for applying voltage to the display device; means for separating light emitted by a light source into light fluxes having three primary colors and projecting the light fluxes to the display device, thereby separating the light fluxes into transmitted light fluxes and scattered light fluxes through the display device; and means for projecting the transmitted light fluxes onto a screen.
Claim 16
Dependent Claim
142 words
A display apparatus, including: a display device, comprising: a pair of electrode plates each comprising a substrate and an electrode thereon including at least one substrate having thereon a transparent electrode, and a first display layer and a second display layer disposed between the electrode plates; wherein said first display layer comprises a polymer matrix and a low-molecular weight mesomorphic compound dispersed in the polymer matrix, and said second display layer comprises a diffraction grating and a low-molecular weight mesomorphic compound; means for applying voltage to the display device; means for separating light emitted by a light source into light fluxes having three primary colors and projecting the light fluxes to the display device, thereby separating the light fluxes into transmitted light fluxes and scattered light fluxes through the display device; and means for projecting the transmitted light fluxes onto a screen.
Claim 17
Dependent Claim
20 words
A display device according to claim 14, wherein said diffraction grating has a grating constant of 0.8 to 10 microns.
Claim 18
Dependent Claim
19 words
A display device according to claim 14, wherein said polymer matrix comprises a porous polymer film having open pores.
Claim 19
Dependent Claim
15 words
A display device according to claim 14, wherein said diffraction grating has a two-dimensional form.
Claim 20
Dependent Claim
23 words
A display device according to claim 14, wherein said low-molecular weight mesomorphic compound in said first display layer comprises a nematic liquid crystal.
Claim 21
Dependent Claim
24 words
A display device according to claim 14, wherein said low-molecular weight mesomorphic compound in said first display layer comprises a chiral smectic mesomorphic compound.
Claim 22
Dependent Claim
24 words
A display device according to claim 14, wherein said low-molecular weight mesomorphic compound in said first display layer comprises a non-chiral smectic mesomorphic compound.
Claim 23
Dependent Claim
23 words
A display device according to claim 14, wherein said low-molecular weight mesomorphic compound in said second display layer comprises a nematic liquid crystal.
Claim 24
Dependent Claim
41 words
A display device according to claim 14, further comprising a third display layer, said third molecular layer comprising a diffraction grating and a low-molecular weight mesomorphic compound, wherein said first display layer is disposed between said second and third display layers.
Claim 25
Dependent Claim
34 words
A display device according to claim 22, wherein each of said two diffraction gratings have a stripe shape including lines and spaces, and are disposed such that their stripes are perpendicular to each other.
Claim 26
Dependent Claim
19 words
A display device according to claim 14, wherein said diffraction grating has a stripe shape including lines and spaces.
References Cited (Backward Citations)
JPS533928A
Cited
JPS5331727A
Cited
US4251137A
Cited
JPS56107216A
Cited
US4367924A
Cited
US4411495A
Cited
US4435047A
Cited
US4707080A
Cited
US4729640A
Cited
US4850681A
Cited
US5148302A
Cited
US4995705A
Cited
JPS63271233A
Cited
EP0313053A2
Cited
JPH01198725A
Cited
US5059000A
Cited
US5066107A
Cited
US5011623A
Cited
US5141785A
Cited
US5194973A
Cited
EP0512397A2
Cited
US5296952A
Cited
US5299289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-04 | 1999-06-05 | 1999-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-04 | 2003-06-05 | 2003-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-04 | 2007-06-05 | 2007-12-05 | $7700.00 | Window Closed / Lapsed |