Thin film color filter for liquid crystal display
AssigneeSeiko Epson Corporation
InventorsFumiaki Matsushima, Mitsuro Atobe, Yoshihiro Ono, Yasuto Nose
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Abstract
Thin film devices including a film of a functional organic material, inorganic material or mixtures which are either insoluble or sparingly soluble in water, and deposited by electroplating. Particles of the functional material are dispersed in a micelle solution of a surfactant which is oxidizable and reducible by electrolysis in a colloidal state. Thin film devices prepared include color filters, optical recording media, electrochemical photoreceptors, nonlinear switching elements, and other devices requiring thin films of materials which are substantially insoluble in water.
Claims24
A color filter comprising
- a transparent substrate;
- a transparent electrically conductive layer supported by the substrate in the form of spaced and substantially parallel electrode stripes;
- a thin film with a thickness of from about 0.4 to 1.1 .mu.m consisting of at least two different organic pigments and optionally including dopant material for increasing the electrical conductivity of the thin film, disposed on the conductive layer, the organic pigments being substantially insoluble in water, the thin film of organic pigments deposited on the conductive layer by electrolysis from a solution containing a redox reactive surfactant in which the organic pigments are colloidally dispersed, the two different pigments of the thin film each having different wavelength transmittance properties and a primary particle size of from 0.005 to 0.5 .mu.m.
A color filter for a liquid crystal display, comprising:
- a transparent substrate;
- a transparent electrically conductive layer disposed on a portion of the substrate in the form of three groups of substantially parallel electrode stripes;
- a red thin film on a first group of stripes, a green thin film on a second group of stripes and a blue thin film on a third group of stripes, each thin film including at least two organic pigments having different light transmittance properties, the thin films having been disposed on the stripes by electrolysis from at least one solution containing a surfactant that is oxidizable or reducible, in which the organic pigments are colloidally dispersed, the organic pigments being substantially insoluble in water;
- the pigments having a primary particle size of between about 0.005 and 0.5 .mu.m;
- and the thin films being about 0.4 to 1.1 .mu.m thick
A color filter, comprising a transparent substrate;
- at least two groups of substantially parallel transparent electrode stripes;
- at least two groups of differently colored thin film organic pigment layers having a thickness from about 0.4 to 1.1 .mu.m, each group of differently colored thin films being on an associated group of electrodes, the groups of differently colored thin film layers being at least two groups selected from (a) red layers having an essential light transmission wavelength range substantially between 600 and 700 nm (b) blue layers having an essential light transmission wavelength in the range from about 450 to 500 nm or and (c) green layers having an essential light transmission wavelength range between about 500 and 550 nm, to form at least two groups of differently colored transparent electrode stripes;
- the thin film organic pigment layers being formed from pigments having a primary particle size between about 0.005 and 0.5 .mu.m, the pigment layers being deposited from a colloidal dispersion of said organic pigments in an aqueous micelle solution of a redox reactive surfactant.
Dependencies are inferred from the claim text.