# US 9,519,132 B2 · Electrowetting display device and method for preparing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,132 B2 - Document ID: US9519132B2 - Status: Granted - Kind: B2 - Application number: 14/413,369 - Filed: 2014-04-28 - Published: 2016-09-22 - Granted: 2016-12-13 - Earliest claimed: 2013-09-10 - Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd. - Applicants: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd. - Inventors: Mingchao Wang; Junwei Wang - Web page: https://patentgrep.com/patent/US9519132B2 ## CPC - G02B 26/005: {based on electrowetting} - C23F 1/00: Etching metallic material by chemical means (manufacture of printing surfaces B41C; manufacture of printed circuits H05K) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 ## Abstract The present invention discloses an electrowetting display device and a method for preparing the same. The electrowetting display device comprises several fluid chambers and a polar fluid accommodated in the fluid chambers, wherein the fluid chamber comprises a base; the base comprises a first electrode and a second electrode that are insulated from each other and an electro-conversion film, wherein the electro-conversion film is located on one side of the first electrode that is adjacent to the polar fluid; and wherein the contact angle between the electro-conversion film and the polar fluid converts in the range from a first contact angle to a second contact angle according to the magnitude of a voltage applied; the first contact angle is no larger than 25 degrees, and the second contact angle is no less than 90 degrees. ## Claims ### Claim 1 An electrowetting display device, comprising several fluid chambers and a polar fluid accommodated in the fluid chambers, wherein: the fluid chamber comprises a base, and the base comprises a first electrode and a second electrode that are insulated from each other and an electro-conversion film, wherein the electro-conversion film is located on one side of the first electrode that is adjacent to the polar fluid; wherein, the contact angle between the electro-conversion film and the polar fluid converts in the range from a first contact angle to a second contact angle according to a voltage applied to the first electrode; the first contact angle is no larger than 25 degrees, and the second contact angle is no less than 90 degrees. ### Claim 2 (depends on 1) The electrowetting display device according to claim 1, wherein, the first contact angle is no larger than 10 degrees, and the second contact angle is no less than 150 degrees. ### Claim 3 (depends on 1) The electrowetting display device according to claim 1, wherein, the electro-conversion film is formed of a material of which the molecule includes a hydrophilic group and a hydrophobic group; wherein, the hydrophilic group comprises a thiol group and a carboxyl group, and the hydrophobic group comprises one or more of an alkyl, a benzene ring, a carboxyl group and a fluorine group. ### Claim 4 (depends on 3) The electrowetting display device according to claim 3, wherein, a nonpolar fluid is further provided in the fluid chamber, and the fluid chamber is divided into a shrinking region and an expanding region; wherein, the shrinking region is configured for the aggregation of the nonpolar fluid, and the electro-conversion film is located in the expanding region. ### Claim 5 (depends on 4) The electrowetting display device according to claim 4, wherein, the first electrode is located in the expanding region. ### Claim 6 (depends on 4) The electrowetting display device according to claim 4, wherein, the polar fluid is water, and the nonpolar fluid is a pigment-containing oil layer. ### Claim 7 (depends on 1) A method for preparing the electrowetting display device according to claim 1, comprising: forming a pattern including a second electrode on a first substrate; forming a pattern including a first electrode that is insulated from the second electrode; and forming a pattern including an electro-conversion film on the pattern including a first electrode that is formed. ### Claim 8 (depends on 7) The method for preparing an electrowetting display device according to claim 7, further comprising: forming a retaining wall of the fluid chamber on the pattern including an electro-conversion film; providing a polar fluid and a nonpolar fluid in the fluid chamber; and oppositely arranging a second substrate and the first substrate on which the above steps have been performed, to form a cell. ### Claim 9 (depends on 7) The method for preparing an electrowetting display device according to claim 7, wherein, the fluid chamber is divided into a shrinking region and an expanding region, and the electro-conversion film is only formed in the expanding region. ### Claim 10 (depends on 9) The method for preparing an electrowetting display device according to claim 9, wherein, the first electrode is only formed in the expanding region. ### Claim 11 (depends on 2) The electrowetting display device according to claim 2, wherein, the electro-conversion film is formed of a material of which the molecule includes a hydrophilic group and a hydrophobic group; wherein, the hydrophilic group comprises a thiol group and a carboxyl group, and the hydrophobic group comprises one or more of an alkyl, a benzene ring, a carboxyl group and a fluorine group. ### Claim 12 (depends on 11) The electrowetting display device according to claim 11, wherein, a nonpolar fluid is further provided in the fluid chamber, and the fluid chamber is divided into a shrinking region and an expanding region; wherein, the shrinking region is configured for the aggregation of the nonpolar fluid, and the electro-conversion film is located in the expanding region. ### Claim 13 (depends on 12) The electrowetting display device according to claim 12, wherein, the first electrode is located in the expanding region. ### Claim 14 (depends on 12) The electrowetting display device according to claim 12, wherein, the polar fluid is water, and the nonpolar fluid is a pigment-containing oil layer. ### Claim 15 (depends on 8) The method for preparing an electrowetting display device according to claim 8, wherein, the fluid chamber is divided into a shrinking region and an expanding region, and the electro-conversion film is only formed in the expanding region. ### Claim 16 (depends on 15) The method for preparing an electrowetting display device according to claim 15, wherein, the first electrode is only formed in the expanding region.