Abstract: A process for the manufacture of a relief element useful in liquid crystal display panels to control the gap-width of the liquid crystal layer, which process comprises the steps of:(I) pattern-wise photo-exposing a photographic silver halide emulsion material comprising on a support a single gelatin containing silver halide emulsion layer to form a latent pattern of exposed silver halide, and(II) treating the exposed silver halide emulsion layer with an aqueous solution containing a developing agent for said halide in the presence of a colorless coupling agent capable of forming with oxidized developing agent a diffusion resistant colorless reaction product increasing the thickness of said emulsion layer in the exposed regions.The treating step (II) can occur also in the presence of a color developing agent reactive with the oxidized developing agent to form a colored reaction product in the exposed regions.
January 13, 1988
Date of Patent:
May 16, 1989
Raymond A. Roosen, Marcellus H. De Meyer, Marcel J. Monbaliu
Abstract: A process is disclosed for enhancing the speed of both certain black and white and color films, through initial black-and-white development, and redevelopment with color coupling developers and color coupling dye units, and replacement of silver units with multiple color dye units for each silver unit that provide a color image enhanced over that provided by the silver image.
Abstract: A process for forming a color filter, which comprises patternwise exposing a black-and-white silver halide emulsion layer of a photographic material comprising a support having thereon at least one black-and-white silver halide emulsion layer, developing the photographic material with a developing solution containing a color dye developer to form a pattern containing a color dye for a pattern containing at least one dye, and removing remaining silver and/or silver halide. The patternwise exposure and color coupler containing development steps can be repeated using different color couplers to produce patterns with additional color dyes.
Abstract: A method for producing a multicolor optical filter, which comprises exposing a photographic material comprising a support and at least one black-and-white silver halide emulsion layer to light through a first pattern; developing the exposed emulsion layer with a first coupler-containing color developer to form a pattern of a first dye; then exposing an unexposed portion of said emulsion layer to light through a second pattern; developing the exposed area with a second coupler-containing color developer to form a pattern of a second dye; optionally repeating exposure and development to form patterns containing dyes of third and subsequent colors, thereby to form color patterns of at least two colors; and subjecting the product to a silver removal treatment after the final color development step.