# US 2012/0073116 A1 · Method for Manufacturing Electrophoretic Display Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0073116 A1 - Document ID: US20120073116A1 - Status: Published application - Kind: A1 - Application number: 13/227,636 - Filed: 2011-09-08 - Published: 2012-03-29 - Earliest claimed: 2010-09-24 - Assignees: LG Display Co., Ltd. - Inventors: Yu Sok LIM; Myoung Ho LEE; Young Mu OH; Seung Han PAEK; Young Jun YU; Sung Jin PARK; Seung-Hee KANG - Web page: https://patentgrep.com/patent/US20120073116A1 ## CPC - G02F 1/167: by electrophoresis - G02F 1/1679: Gaskets; Spacers; Sealing of cells; Filling or closing of cells - G02F 1/1681: having two or more microcells partitioned by walls, e.g. of microcup type - Y10T 29/49002: Electrical device making - Y10T 29/49146: with encapsulating, e.g., potting, etc. - Y10T 29/49226: Electret making - 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 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A method for manufacturing an electrophoretic display device includes forming partition walls for defining a plurality of pixel regions on a lower substrate; filling charged particles into the plurality of pixel regions; filling a pixel solvent in the plurality of pixel regions having been filled with the charged particles; and attaching the lower substrate and an upper substrate to each other. ## Claims ### Claim 1 A method for manufacturing an electrophoretic display device, comprising: forming partition walls for defining a plurality of pixel regions on a lower substrate; filling charged particles into the plurality of pixel regions; filling a pixel solvent into the plurality of pixel regions having been filled with the charged particles; and attaching the lower substrate and an upper substrate to each other. ### Claim 2 (depends on 1) The method according to claim 1, further comprising sealing an upper part of the partition walls and the pixel solvent. ### Claim 3 (depends on 1) The method according to claim 1, wherein the step of filling the charged particles into the plurality of pixel regions includes: filling the pixel regions with a filing solvent having the charged particles; and volatilizing the filling solvent. ### Claim 4 (depends on 3) The method according to claim 3, wherein the step of filling the charged particles into the plurality of pixel regions includes: filling charged red color particles; filling charged green color particles, and filling charged blue color particles. ### Claim 5 (depends on 4) The method according to claim 4, wherein the step of filling the charged particles into the plurality of pixel regions includes: partially or totally volatilizing the filling solvent after filling the filling solvent including red-colored charged particles into red pixels among the plurality of pixel regions; partially or totally volatilizing the filling solvent after filling the filling solvent including green-colored charged particles into green pixels among the plurality of pixel regions; and partially or totally volatilizing the filling solvent after filling the filling solvent including blue-colored charged particles into blue pixels among the plurality of pixel regions. ### Claim 6 (depends on 3) The method according to claim 3, wherein the viscosity of the filling solvent is larger than the viscosity of the pixel solvent. ### Claim 7 (depends on 6) The method according to claim 6, wherein the viscosity of the filling solvent is between 100 cP and 100 kcP. ### Claim 8 (depends on 6) The method according to claim 6, wherein the viscosity of the pixel solvent is between 1 cP and 100 cP. ### Claim 9 (depends on 3) The method according to claim 3, wherein the step of filling the pixel regions with the filing solvent having the charged particles includes filling with 10-30 percent by volume of solvent and 70-90 percent by volume of charged particles. ### Claim 10 (depends on 3) The method according to claim 3, wherein the filling solvent filled in the plurality of pixel regions is totally volatilized before filling the pixel solvent into the plurality of pixel regions. ### Claim 11 (depends on 10) The method according to claim 10, wherein the filling solvent is volatilized by applying a temperature less than 150° C. ### Claim 12 (depends on 3) The method according to claim 3, wherein the step of volatilizing the filling solvent is carried out for period between 1 minute and 24 hours. ### Claim 13 (depends on 3) The method according to claim 3, wherein the pixel solvent is simultaneously filled into the plurality of pixel regions after totally volatilizing the filing solvent. ### Claim 14 (depends on 3) The method according to claim 3, wherein the filling solvent and pixel solvent include one of a halogenated solvent, a saturated hydrocarbon, silicon oil, a low-molecular weight halogen-containing polymer, an epoxide, a vinylether, a vinylestr, an aromatic hydrocarbon, toluene, naphthalene, a paraffinic liquid, or a poly chlorotrifluoroethylene polymer. ### Claim 15 (depends on 3) The method according to claim 3, wherein the filling solvent and pixel solvent include non-polar organic materials. ### Claim 16 (depends on 1) The method according to claim 1, wherein the charged particles include colored charged particles. ### Claim 17 (depends on 1) The method according to claim 1, wherein the step of filling the charged particles into the plurality of pixel regions includes a screen printing method using a mask which selectively opens a red pixel, a green pixel, and a blue pixel among the plurality of pixel regions under a squeeze speed of 5-50 mm/second and a squeeze pressure of 0.1-30 kgf. ### Claim 18 (depends on 1) The method according to claim 1, wherein the step of filling the pixel solvent into the plurality of pixel regions includes: inverting the lower substrate having the partition walls; and contacting the inverted lower substrate with pixel solvent so as to fill the plurality of pixel regions with the pixel solvent. ### Claim 19 (depends on 1) The method according to claim 1, wherein the step of filling the charged particles into the plurality of pixel regions and the step of filling the pixel solvent into the plurality of pixel regions are carried out by any one of a die coating method, a casting method, a bar coating method, a slit coating method, a dispense method, a squeezing method, a screen-printing method, and an inkjet printing method. ### Claim 20 (depends on 1) The method according to claim 1, wherein the partition walls have wall portions with a height of 10 μm-100 μm, and a width of 5 μm-30 μm.