# US 2014/0198149 A1 · Printing apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0198149 A1 - Document ID: US20140198149A1 - Status: Published application - Kind: A1 - Application number: 13/927,335 - Filed: 2013-06-26 - Published: 2014-07-17 - Earliest claimed: 2013-01-17 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Yoon-Ho KANG - Web page: https://patentgrep.com/patent/US20140198149A1 ## CPC - B41J 3/28: for printing downwardly on flat surfaces, e.g. of books, drawings, boxes {, envelopes, e.g. flat-bed ink-jet printers} - B41J 3/407: for marking on special material - B41J 11/06: Flat page-size platens {or smaller flat platens having a greater size than line-size platens (B41J11/0085 takes precedence)} - H10K 71/135: {using ink-jet printing} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A printing apparatus that recognizes a location of a substrate, which is a printing target, and performs printing. The printing apparatus includes: a stage to which the substrate is mounted; a location recognition unit recognizing a location of the substrate mounted to the stage; and a printing unit disposed in an upper portion of the stage and coating a printing solution on the substrate, and the location recognition unit includes a plurality of alignment marks formed in the substrate and a camera photographing the alignment marks. The plurality of alignment marks are disposed to be rotationally symmetrical to each other with reference to the center of the substrate for the locations of the alignment marks to be the same even though the substrate is rotated by a predetermined angle with reference to the center of the substrate. ## Claims ### Claim 1 A printing apparatus recognizing a location of a substrate which is a printing target, and performing printing, comprising: a stage to which the substrate is mounted; a location recognition unit recognizing a location of the substrate mounted to the stage; and a printing unit disposed in an upper portion of the stage and coating a printing solution on the substrate, wherein the location recognition unit comprises, a plurality of alignment marks formed in the substrate and a camera photographing the alignment marks, and the plurality of alignment marks are disposed to be rotationally symmetrical to each other with reference to the center of the substrate for the locations of the alignment marks to be the same even though the substrate is rotated by a predetermined angle with reference to the center of the substrate. ### Claim 2 (depends on 1) The printing apparatus of claim 1, wherein the alignment marks include at least four alignment marks, and the at least four alignment marks are rotationally symmetrical for every 90 degree angle. ### Claim 3 (depends on 2) The printing apparatus of claim 2, wherein the at least four alignment marks are disposed in the shape of a square. ### Claim 4 (depends on 1) The printing apparatus of claim 1, wherein each of the alignment marks is rotationally symmetric. ### Claim 5 (depends on 1) The printing apparatus of claim 1, wherein the location recognition unit further comprises an operation device that recognizes a coordinate of the alignment mark photographed by the camera. ### Claim 6 (depends on 1) The printing apparatus of claim 1, wherein the camera comprises at least two cameras. ### Claim 7 (depends on 6) The printing apparatus of claim 6, wherein the at least two cameras are disposed in a fixed manner so as to correspond to the locations of the alignment marks. ### Claim 8 (depends on 1) The printing apparatus of claim 1, wherein the printing unit, comprises: a printing head dropping the printing solution on the substrate; and a moving frame in which the printing head is provided movable to at least two axis directions. ### Claim 9 (depends on 8) The printing apparatus of claim 8, wherein the moving frame, comprises: a frame member provided movable to a first axis direction in an upper portion of the stage; and a moving member provided movable to a second axis direction that is perpendicular to the first axis direction in the frame member, wherein the printing head is provided in one side of the moving member. ### Claim 10 (depends on 1) The printing apparatus of claim 1, further comprising: a controller controlling a location of the substrate through information recognized by the location recognition unit. ### Claim 11 A printing apparatus for printing on a substrate, comprising: a printing unit that coats a printing solution onto said substrate; and a location recognition unit to recognize a location of the substrate, said location recognition unit comprises: a plurality of alignment marks formed in the substrate; and a plurality of cameras photographing the alignment marks, said plurality of cameras positioned to correspond to said plurality of alignment marks, the plurality of alignment marks are disposed to be rotationally symmetrical to each other with reference to the center of the substrate for the locations of the alignment marks to be the same even though the substrate is rotated by a predetermined angle with reference to the center of the substrate. ### Claim 12 (depends on 11) The printing apparatus of claim 11, wherein the alignment marks include at least four alignment marks, and the at least four alignment marks are rotationally symmetrical for every 90 degree angle. ### Claim 13 (depends on 12) The printing apparatus of claim 12, wherein the at least four alignment marks are disposed in the shape of a square. ### Claim 14 (depends on 11) The printing apparatus of claim 11, wherein each of the alignment marks is rotationally symmetric. ### Claim 15 (depends on 11) The printing apparatus of claim 11, wherein the location recognition unit further comprises an operation device that recognizes a coordinate of the alignment mark photographed by the camera. ### Claim 16 (depends on 11) The printing apparatus of claim 11, wherein the plurality of cameras is two cameras. ### Claim 17 (depends on 16) The printing apparatus of claim 16, wherein the two cameras are disposed in a fixed manner so as to correspond to the locations of the alignment marks. ### Claim 18 (depends on 11) The printing apparatus of claim 11, wherein the printing unit comprises a printing head dropping the printing solution on the substrate; and a moving frame in which the printing head is provided movable to at least two axis directions. ### Claim 19 (depends on 18) The printing apparatus of claim 18, wherein the moving frame, comprises: a frame member provided movable to a first axis direction in an upper portion of the stage; and a moving member provided movable to a second axis direction that is perpendicular to the first axis direction in the frame member, wherein the printing head is provided in one side of the moving member. ### Claim 20 (depends on 11) The printing apparatus of claim 11, further comprising: a controller controlling a location of the substrate through information recognized by the location recognition unit.