Patent US6020866A successfully refreshed from Google Patents.
US6020866A
Expired / Lapsed
US
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Method and display panel for displaying color image
Assignee: NEC Corp
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Filing: 1996-11-26
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Granted: 2000-02-01
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Expires: 2016-11-26
Abstract
Abstract A color image is displayed by using a display panel with a color pattern layer which is formed on one side of a transparent substrate and has, for example, three separate sets of transparent pixel areas in red, green and blue colors which constitute a regularly repetitive pattern and a set of opaque band-like areas by which each pixel area is bordered. The display panel further comprises, usually on the opposite side of the substrate, either a thermal recording layer which exhibits reversible changes in transmittance with temperature or a magnetic recording layer which contains flaky particles of a ferromagnetic metal dispersed in a polymer and exhibits reversible changes in transmittance with orientations of the flaky particles. To display an image, the thermal recording layer is heated in areas opposite to selected pixel areas of the color pattern layer, or a magnetic field parallel to or perpendicular to the display panel is applied to the magnetic recording layer in areas opposite to selected pixel areas, and then the display panel is backlighted.
Inventors
- 👤 Chiseki Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:03
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/375; C; C09; C09K; C09K2323/00; C09K2323/06; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/31504; Y10T428/31536; Y10T428/31801
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
155 words
A method of displaying a color image on a display panel, the method comprising: using a display panel having a transparent substrate, a color pattern layer which is formed on one side of the substrate and has a multiplicity of transparent pixel areas consisting of at least two separate sets of pixel areas in different colors which constitute a repetitive pattern and a set of repetitively arranged opaque areas by which each of the pixel areas is bordered, and a recording layer which is formed on the substrate to lie parallel to the color pattern layer and is formed of a recording material which exhibits reversible changes in transmittance by application of external stimulus; selectively applying an external stimulus to the recording layer of the display panel to change the transmittance of the recording layer in areas opposite to selected pixel areas of the color pattern layer; and backlighting the display from a selected side.
Claim 2
Independent Claim
155 words
A method of displaying a color image on a display panel, the method comprising: using a display panel having a transparent substrate, a color pattern layer which is formed on one side of the substrate and has a multiplicity of transparent pixel areas consisting of at least two separate sets of pixel areas in different colors which constitute a repetitive pattern and a set of repetitively arranged opaque areas by which each of the pixel areas is bordered, and a recording layer which is formed on the substrate to lie parallel to the color pattern layer and is formed of a recording material which exhibits reversible changes in transmittance by application of external stimulus; selectively applying an external stimulus to the recording layer of the display panel to change the transmittance of the recording layer in areas opposite to selected pixel areas of the color pattern layer; and backlighting the display from a selected side.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein said recording material is a thermal recording material which exhibits reversible changes in transmittance with temperature, said external stimulus being heat.
Claim 4
Dependent Claim
22 words
A method according to claim 1, wherein said recording material is a magnetic recording material, said external stimulus being a magnetic field.
Claim 5
Dependent Claim
64 words
A method according to claim 3, wherein said magnetic recording material comprises flaky particles of a ferromagnetic metal dispersed in a transparent polymer, said magnetic field being in such a direction that said flaky particles in said areas are oriented in a direction selected from a first direction which is parallel to said substrate and a second direction which is perpendicular to said substrate.
Claim 6
Independent Claim
150 words
A method of displaying a color image on a display panel, the method comprising: using a display panel having a transparent substrate, a color pattern layer which is formed on one side of the substrate and has a multiplicity of transparent pixel areas consisting of at least two separate sets of pixel areas in different colors which constitute a repetitive pattern and a set of repetitively arranged opaque areas by which each of the pixel areas is bordered, and a thermal recording layer which is formed on the opposite side of the substrate and is formed of a thermal recording material which exhibits reversible changes in transmittance with temperature; selectively heating the thermal recording layer to change the transmittance of the recording layer in areas opposite to selected pixel areas of the color pattern layer; and backlighting the display panel from the side on which the color pattern layer exists.
Claim 7
Independent Claim
150 words
A method of displaying a color image on a display panel, the method comprising: using a display panel having a transparent substrate, a color pattern layer which is formed on one side of the substrate and has a multiplicity of transparent pixel areas consisting of at least two separate sets of pixel areas in different colors which constitute a repetitive pattern and a set of repetitively arranged opaque areas by which each of the pixel areas is bordered, and a thermal recording layer which is formed on the opposite side of the substrate and is formed of a thermal recording material which exhibits reversible changes in transmittance with temperature; selectively heating the thermal recording layer to change the transmittance of the recording layer in areas opposite to selected pixel areas of the color pattern layer; and backlighting the display panel from the side on which the color pattern layer exists.
Claim 8
Dependent Claim
22 words
A method according to claim 5, wherein said thermal recording material comprises a mixture of a fatty acid and a thermoplastic resin.
Claim 9
Dependent Claim
16 words
A method according to claim 5, wherein said thermal recording material comprises a polymer liquid crystal.
Claim 10
Dependent Claim
15 words
A method according to claim 5, wherein said thermal recording material comprises a polymer blend.
Claim 11
Dependent Claim
27 words
A method according to claim 5, wherein the color pattern layer has three separate sets of pixel areas which are in red, green and blue colors, respectively.
Claim 12
Dependent Claim
14 words
A method according to claim 5, wherein all the pixel areas are rectangular areas.
Claim 13
Dependent Claim
13 words
A method according to claim 5, wherein said opaque, areas are black areas.
Claim 14
Independent Claim
200 words
A method of displaying a color image on a display panel, the method comprising: using a display panel having a transparent substrate, a color pattern layer which is formed on one side of the substrate and has a multiplicity of transparent pixel areas consisting of at least two separate sets of pixel areas in different colors which constitute a repetitive pattern and a set of repetitively arranged opaque areas by which each of the pixel areas is bordered, and a magnetic recording layer which is formed on the substrate to lie parallel to the color pattern layer and is formed of a magnetic recording material comprising flaky particles of a ferromagnetic metal dispersed in a transparent polymer; orienting said flaky particles in the magnetic recording layer in a first direction which is parallel to the substrate or in a second direction which is perpendicular to the substrate; selectively applying a magnetic field to the magnetic recording layer to change the orientation of said flaky particles to one of said first and second directions in areas opposite to selected pixel areas of the color pattern layer; and backlighting the display panel from the side on which the color pattern layer exists.
Claim 15
Independent Claim
200 words
A method of displaying a color image on a display panel, the method comprising: using a display panel having a transparent substrate, a color pattern layer which is formed on one side of the substrate and has a multiplicity of transparent pixel areas consisting of at least two separate sets of pixel areas in different colors which constitute a repetitive pattern and a set of repetitively arranged opaque areas by which each of the pixel areas is bordered, and a magnetic recording layer which is formed on the substrate to lie parallel to the color pattern layer and is formed of a magnetic recording material comprising flaky particles of a ferromagnetic metal dispersed in a transparent polymer; orienting said flaky particles in the magnetic recording layer in a first direction which is parallel to the substrate or in a second direction which is perpendicular to the substrate; selectively applying a magnetic field to the magnetic recording layer to change the orientation of said flaky particles to one of said first and second directions in areas opposite to selected pixel areas of the color pattern layer; and backlighting the display panel from the side on which the color pattern layer exists.
Claim 16
Dependent Claim
18 words
A method according to claim 12, wherein said flaky particles are confined in microcapsules of an organic material.
Claim 17
Dependent Claim
26 words
A method according to claim 12, wherein said color pattern layer and said magnetic recording layer are formed on the opposite sides of the substrate, respectively.
Claim 18
Dependent Claim
27 words
A method according to claim 12, wherein the color pattern layer has three separate sets of pixel areas which are in red, green and blue colors, respectively.
Claim 19
Dependent Claim
14 words
A method according to claim 12, wherein all the pixel areas are rectangular areas.
Claim 20
Dependent Claim
13 words
A method according to claim 12, wherein said opaque, areas are black areas.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-31 | 2003-08-02 | 2004-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-31 | 2007-08-02 | 2008-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-31 | 2011-08-02 | 2012-02-01 | $7700.00 | Window Closed / Lapsed |