Method and display panel for displaying color image
First Claim
1. 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.
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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.
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Citations
17 Claims
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1. A method of displaying a color image on a display panel, the method comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. A method of displaying a color image on a display panel, the method comprising:
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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. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method of displaying a color image on a display panel, the method comprising:
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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. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification