Agfa Gevaert Nv

Agfa-gevaert

Raymond A Roosen

Marcel J Monbaliu

Marcellus H De Meyer

Wilhelmus Janssens

Luc J Vanmaele

Jean-Pierre D Tahon

Robert J Pollet

Antoon Leon Vandenberghe

Herman Van Gorp

Modest Vereycken

In a process for the manufacture of a multi-color filter array element, for use in color flat panel displays, a multi-layer color photographic material is exposed to printing light, modulated by a master. Instead of varying the conditions of the printing light in order to achieve specified calorimetric characteristics, the filter density of the pixels on the master is established such that a correct color print is obtained under fixed standard printing conditions. A method is disclosed for computing and achieving the required spectral densities on the color print and on the master.

Production of matching color prints by establishing suitable color master

A method is provided for manufacturing a multicolor filter array element, firmly associated with a transparent electrode layer in a multicolor liquid crystal display device, comprising the steps of:

Method for photographically producing multi-color filter arrays for use

Black colored dye mixture for use in thermal dye sublimation transfer composed of at least four dyes and comprising two dyes having absorption maxima in the spectral range between 470 and 600 nm that are at least 30 nm apart from each other.

Black colored dye mixture for use according to thermal dye sublimation

A photographic print material suited for the production of a multicolor filter array element for use in a liquid crystal display device including a liquid crystal layer wherein the print material comprises a glass plate supporting on one side thereof (i) a silver halide emulsion layer sensitive to blue light and containing a yellow dye forming color coupler, (ii) a silver halide emulsion layer sensitive to green light and containing a magenta dye forming color coupler, and (iii) a sliver halide emulsion layer sensitive to red light and containing a cyan dye forming color coupler. The red light sensitive emulsion layer is disposed on the side of the array remote from the glass supporting plate and in each of the silver halide emulsion layers the equivalent ratio of silver halide to color coupler is at least 1 and preferably 1.2. A water-impermeable organic resin covering layer is applied over the red light sensitive emulsion layer and a transparent electrode layer is vacuum deposited over the covering layer. In the liquid crystal display device, the filter array element is arranged with its glass plate opposite from the liquid crystal layer.

Photographic print material suited for the production of a multicolor

In a liquid crystal display wherein a liquid crystal material is contained in a gap defined between two surfaces, at least one of the said facing surfaces of the gap is constructed by a multi-color relief layer obtained by the color-development of a single hydrophilic colloid silver halide emulsion layer. The relief layer has different regions of multiple different thicknesses corresponding to the plurality of colors thereof, the thickness of each such relief region being characteristic of the particular color of that region. Each different relief region contains a dye of the corresponding color derived from a color coupling agent by the color development and a diffusion-resistant colorless compound derived from a colorless coupling agent by said color development. The colorless compound is present in each relief region in an amount which is different from that in each other relief region and is characteristic of that region. The different thicknesses of the relief layer are so determined in relation to the wave lengths of the corresponding colors that an improvement in visual contrast between electrically energized and electrically non-energized regions of the display is obtained.

Liquid crystal display

Method for the production of a multicolor filter array wherein individual color pixels are delineated by a light absorbing contour pattern, which method comprises the steps of:

Method for the production of a multicolor filter array

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:

Process for the manufacture of a relief element

Novel photographic imaging process and materials suitable therefor are provided, which can find their application in multi-color motion picture and simultaneous sound recording, in direct-positive image formation, in image-intensification processes, etc. A photographic silver image is formed in at least one hydrophilic colloid layer of a light-sensitive photographic material incorporating silver halide, by means of exposure and alkaline development steps, followed by bleaching of quantities of silver which are present in areas of said layer extraneous to those where imaging silver is required. A non-diffusible silver bleach inhibitor is initially present in said layer or is released therein during processing of the material but before the bleaching step to prevent bleaching of the required imaging silver in said layer in the bleaching step and the prevention of the bleaching of the silver by the bleach inhibitor in the areas extraneous to those where imaging silver is required is counteracted by the presence in the corresponding areas of such layer of a bleach accelerator which is caused to diffuse into such areas from an adjacent hydrophilic colloid layer during the development processing of the material.

Growing community of inventors

's-Gravenwezel, Belgium

Raymond A Roosen