G - Physics – 03 – C
Patent
G - Physics
03
C
96/270
G03C 5/26 (2006.01) G02F 1/1335 (2006.01) G03F 7/00 (2006.01) G03F 7/30 (2006.01)
Patent
CA 2015612
-i- METHOD OF MAKING OPAQUE GRID LINES FOR THERMALLY-TRANSFERRED COLOR FILTER ARRAY ELEMENT Abstract A process of making opaque grid lines for a color filter array element comprising a) exposing to light through a negative grid pattern a photo-hardenable element comprising a support having thereon a coating comprising a water-soluble polymer; a water-soluble dichromate salt; and up to 1 g/m2 of a black pigment, black dye or dyes providing an opaque color, or a precursor thereof; b) washing the element with a solvent to remove the unexposed areas of the element, leaving a grid line pattern of hardened polymeric substance on the element; and c) drying the element to produce open cells on the support divided by opaque lines of the hardened polymeric substance greater than 0.3 µm in height above the support. In another embodiment of the invention, the above dichromate salt coating does not contain any black pigment or dye, and the grid pattern is dyed black before the drying step. Thus, a process of making opaque grid lines for a color filter array element according to another embodiment of the invention comprises a) exposing to light through a negative grid pattern a photo-hardenable element comprising a support having thereon a coating comprising a water-soluble polymer and a water-soluble dichromate salt; b) washing the element with a solvent to remove the unexposed areas of the element, leaving -ii- a grid line pattern of hardened polymeric substance on the element; c) soaking the element in a solution of black dye or dyes providing a black, opaque color of sufficient concentration to provide a laydown of up to 1.0 g/m2, and d) drying the element to produce open cells on the support divided by opaque lines of the hardened polymeric substance greater than 0.3µm in height above the support. In another preferred embodiment, the above processes include the further steps of: e) coating the cellular element with a polymeric dye-receiving layer; and f) thermally transferring individual dyes to form a color filter array element comprising a repeating mosaic pattern of colorants in a polymeric binder, the pattern being made up of color patches bounded by the opaque lines in a grid pattern.
Eastman Kodak Company
Gowling Lafleur Henderson Llp
Simons Michael J.
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