Method for preprinting and/or reliquifying subpixels to achieve color uniformity in color filters
AssigneePalo Alto Research Center Incorporated
InventorJohn Fitch
Life of this patent
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Abstract
A first fluid, e.g., a clear solvent, is printed in a subpixel of a color filter prior to printing droplets of a second fluid such as colored liquid into the subpixel areas. This first fluid could have surface wetting properties such that it is hydrophilic to the substrate (glass) but hydrophobic to the boundary (black matrix). Therefore, the first fluid would flow over the entire subpixel area, but not onto the black matrix. The first fluid would then allow color fluid to disperse uniformly throughout the subpixel. This first fluid may also be used in additional embodiments to re-liquify a dry or partially dry color subpixel, so that color non-uniformities can be corrected.
Claims22
A method for forming a color filter on a substrate comprising:
- forming a plurality of boundary elements on the substrate, the boundary elements defining a plurality of pixel areas, each pixel area comprised of subpixel areas;
- selecting at least one subpixel area;
- applying a first fluid to the selected subpixel area;
- and,
- emitting at least one drop of a second fluid into the first fluid within the selected subpixel area.
A method for forming a color filter on a substrate having formed thereon a plurality of boundary elements, the boundary elements defining a plurality of pixel areas, each pixel area comprised of subpixel areas, the method comprising:
- selecting at least one subpixel area;
- applying a first fluid to the selected subpixel area;
- and,
- emitting at least one drop of a second fluid into the first fluid within the selected subpixel area.
A method for providing uniformity in color to a color filter, the color filter being formed on a substrate having formed thereon a plurality of boundary elements, the boundary elements defining a plurality of pixel areas, each pixel area comprised of subpixel areas, the method comprising:
- identifying at least one subpixel area that is non-uniform in color;
- and
- applying a first fluid to the identified subpixel area.
Dependencies are inferred from the claim text.