# US 2010/0165449 A1 · Display element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0165449 A1 - Document ID: US20100165449A1 - Status: Published application - Kind: A1 - Application number: 12/377,998 - Filed: 2007-08-01 - Published: 2010-07-01 - Earliest claimed: 2006-08-22 - Assignees: Konica Minolta Holdings, Inc. - Inventors: Takeshi Hakii - Web page: https://patentgrep.com/patent/US20100165449A1 ## CPC - G02F 1/1506: caused by electrodeposition, e.g. electrolytic deposition of an inorganic material on or close to an electrode - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract Provided is a display element, which has simple member configuration, can be driven at a low voltage, and has high display contrast, white display reflectance and high display speed and less display nonuniformity in a long term. The display element has an electrolyte layer, which includes silver or a compound having silver in the chemical structure, between counter electrodes and drives the counter electrodes to melt and deposit the silver. The electrolyte layer contains a butyral resin, a coloring material having an average primary grain diameter of 200 nm or more but not more than 1,000 nm, and an organic solvent having a boiling point of 120° C. or higher but not higher than 300° C. The mass ratio of the organic solvent to the butyral resin is 10:1 or more but not more than 10:5. ## Claims ### Claim 1 A display element comprising an electrolyte layer containing silver or a compound containing silver in a chemical structure thereof between opposed electrodes, and carrying out driving operation for the opposed electrodes to induce silver dissolution and deposition, wherein the electrolyte layer comprises a butyral resin, a coloring material having an average primary particle diameter of from 200 nm to 1,000 nm, an organic solvent having a boiling point of from 120° C. to 300° C., and a weight ratio of the organic solvent to the butyral resin is between 10:1 and 10:5. ### Claim 2 (depends on 1) The display element of claim 1, wherein the weight ratio of the organic solvent to the butyral resin is between 10:1 and 10:3. ### Claim 3 (depends on 1) The display element of claim 1, wherein the butyral resin has a polymerization degree of from 300 to 1,000. ### Claim 4 (depends on 1) The display element of claim 1, wherein the butyral resin has a polymerization degree of from 400 to 800. ### Claim 5 (depends on 1) The display element of claim 1, wherein a number of PVA group represented by (A) is from 15% to 25% based on a total number of the PVA group represented by (A), PVAc group represented by (B) and PVB group represented by (C); wherein R is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group. ### Claim 6 (depends on 1) The display element of claim 1, wherein the organic solvent has a boiling point of from 200° C. to 300° C. ### Claim 7 (depends on 1) The display element of claim 1, wherein the organic solvent has a dielectric constant of from 30 to 80. ### Claim 8 (depends on 1) The display element of claim 1, wherein the organic solvent is a cyclic carboxylic acid ester type compound. ### Claim 9 (depends on 1) The display element of claim 1, wherein the coloring material is a titanium dioxide. ### Claim 10 (depends on 9) The display element of claim 9, wherein a surface of the titanium dioxide is treated by SiO2, Al2O3 or an organic compound. ### Claim 11 (depends on 1) The display element of claim 1, wherein the weight ratio of the organic solvent to the coloring material in the electrolyte layer is between 10:1 and 10:10. ### Claim 12 (depends on 1) The display element of claim 1, wherein the weight ratio of the organic solvent to the coloring material in the electrolyte layer is between 10:2 and 10:8. ### Claim 13 (depends on 1) The display element of claim 1, wherein the electrolyte layer contains a mercapto compound or a thioether compound. ### Claim 14 (depends on 13) The display element of claim 13, wherein the mercapto compound is a compound represented by Formula 1, wherein M is a hydrogen atom, a metal atom or a quaternary ammonium, Z is a nitrogen-containing heterocyclic group, n is an integer of from 0 to 5, and R1 is a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkylcarbonamido group, an arylcarbonamido group, an alkylsulfonamido group, an arylsulfonamido group, an alkyloxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylcarbamoyl group, an arylcarbamoyl group, a carbamoyl group, an alkylsulfamoyl group, an arylsulfamoyl group, a sulfamoyl group, a cyano group, an alkylsulfonyl group, an arylsulfonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylcarbonyl group, an arylcarbonyl group, an acyloxy group, a carboxyl group, a carbonyl group, a sulfonyl group, an amino group, a hydroxyl group and a heterocyclic group. Each of the groups of R1 may be the same as or different from each other when n is 2 or more and may form a condensed ring by bonding with each others. ### Claim 15 (depends on 13) The display element of claim 13, wherein the thioether compound is a compound represented by Formula 2, R2—S—R3 Formula 2: , wherein R2 and R3 each are an alkyl group, an aryl group or a heterocyclic group which may be the same or different and may form a ring by bonding with each others. ### Claim 16 (depends on 1) The display element of claim 1, wherein the electrolyte layer is formed by a screen printing. ### Claim 17 (depends on 1) The display element of claim 1, wherein the electrolyte layer is formed by a dropping from a dispenser. ### Claim 18 (depends on 1) The display element of claim 1, wherein the electrolyte layer is formed by an inkjet method. ### Claim 19 (depends on 1) The display element of claim 1, wherein at least one of the opposite electrodes is formed on a plastic substrate plate. ### Claim 20 (depends on 1) The display element of claim 1, wherein the electrolyte layer is formed by adding the coloring material after dissolving the butyral type resin in the organic solvent.