# US 9,439,248 B2 · Electroluminescent display screen and method for preparing the same, and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,439,248 B2 - Document ID: US9439248B2 - Status: Granted - Kind: B2 - Application number: 14/363,258 - Filed: 2013-12-13 - Published: 2015-08-06 - Granted: 2016-09-06 - Earliest claimed: 2013-08-02 - Assignees: Boe Technology Group Co., Ltd.; Ordos Yuansheng Optoelectronics Co., Ltd. - Applicants: Boe Technology Group Co., Ltd.; Ordos Yuansheng Optoelectronics Co., Ltd. - Inventors: Junsheng Chen - Web page: https://patentgrep.com/patent/US9439248B2 ## CPC - H05B 33/04: Sealing arrangements {, e.g. against humidity} - H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources - H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces - H10K 59/8722: {Peripheral sealing arrangements, e.g. adhesives, sealants} - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract The invention provides an electroluminescent display screen and a method for preparing the same, and a display device, by which an electroluminescent display screen can automatically screen the irradiation of a laser, so that a mask can be omitted, the requirement on the manufacture process can be lowered, the production cost can be reduced, and the production capacity can be increased. An electroluminescent display screen according to the invention includes: a back plane; a package substrate; and a luminescent layer and a frit sealant provided between the back plane and the package substrate. The electroluminescent display screen further comprises a light-shielding pattern layer for shielding the region other than the frit sealant when a laser irradiates on the frit sealant, which is formed on one side of the package substrate that faces the back plane. ## Claims ### Claim 1 An electroluminescent display screen, comprising: a back plane; a package substrate; and a luminescent layer and a frit sealant provided between the back plane and the package substrate, wherein the electroluminescent display screen further comprises a light-shielding pattern layer for shielding the region other than the frit sealant when a laser irradiates on the frit sealant, which is formed on one side of the package substrate that faces the back plane, wherein the light-shielding pattern layer comprises the first annular region and the second annular region, and wherein, the frit sealant surrounds the first annular region, and the second annular region surrounds the frit sealant, wherein a distance between an outmost side edge of a first annular region and an inmost side edge of a second annular region is in a range of 0.6 mm to 1.2 mm, wherein a distance between an inmost side edge of the first annular region and an outmost side edge of the second annular region is a sum of a width of a laser beam and a laser alignment precision, wherein the first annular region is located inside the frit sealant, and the second annular region is located outside the frit sealant, the first annular region functions as a barrier layer for laser irradiation and as a black frame on the cover plate of the display screen, and is used for defining a display region. ### Claim 2 (depends on 1) The electroluminescent display screen according to claim 1, wherein a color of the light-shielding pattern layer is black. ### Claim 3 (depends on 2) The electroluminescent display screen according to claim 2, wherein a material of the light-shielding pattern layer is a metal material, carbon black or titanium black. ### Claim 4 (depends on 3) The electroluminescent display screen according to claim 3, wherein the metal material is aluminum, manganese, chromium, an oxide of chromium or a nitride of chromium. ### Claim 5 (depends on 1) An electroluminescent display device, comprising the electroluminescent display screen according to claim 1. ### Claim 6 A method for preparing an electroluminescent display screen, comprising: forming a luminescent layer on a back plane; forming, on one side of a package substrate that faces the back plane, a light-shielding pattern layer for shielding a region other than a frit sealant when a laser irradiates on the frit sealant; forming a frit sealant on one side of the back plane that faces the package substrate or on one side of the package substrate that faces the back plane; irradiating the frit sealant through a laser from one side of the package substrate that is away from the back plane, and packaging the package substrate and the back plane, 1wherein the light-shielding pattern layer comprises the first annular region and the second annular region, and wherein, the frit sealant surrounds the first annular region, and the second annular region surrounds the frit sealant, wherein a distance between an outmost side edge of a first annular region and an inmost side edge of a second annular region is in a range of 0.6 mm to 1.2 mm, and wherein a distance between an inmost side edge of the first annular region and an outmost side edge of the second annular region is a sum of a width of a laser beam and a laser alignment precision, wherein the first annular region is located inside the frit sealant, and the second annular region is located outside the frit sealant, the first annular region functions as a barrier layer for laser irradiation and as a black frame on the cover plate of the display screen, and is used for defining a display region. ### Claim 7 (depends on 6) The method according to claim 6, wherein the forming, on one side of a package substrate that faces the back plane, a light-shielding pattern layer for shielding a region other than the frit sealant when a laser irradiates on the frit sealant comprises: forming a light-shielding pattern layer for shielding a region other than the frit sealant when a laser irradiates on the frit sealant on one side of a package substrate that faces the back plane through a patterning process. ### Claim 8 (depends on 7) The method according to claim 7, wherein the forming a light-shielding pattern layer for shielding a region other than the frit sealant when a laser irradiates on the frit sealant on one side of a package substrate that faces the back plane through a patterning process comprises: coating a material of the light-shielding pattern layer on one side of the package substrate that faces the back plane; coating a photoresist on the material of the light-shielding pattern layer, and exposing and developing the photoresist to form a first photoresist-removed region in the region of the package substrate that corresponds to the frit sealant, form a first photoresist-reserved region inside a frit sealant region, form a second photoresist-reserved region outside the frit sealant region, and form a second photoresist-removed region inside the first photoresist-reserved region; and etching the material of the light-shielding pattern layer in the photoresist-removed region and peeling off the photoresist, and obtaining the light-shielding pattern layer consisted of the first annular region inside the frit sealant region and the second annular region outside the frit sealant region. ### Claim 9 (depends on 2) The electroluminescent display screen according to claim 2, wherein there is no black light-shielding pattern layer in the display region of the electroluminescent display screen. ### Claim 10 (depends on 1) The electroluminescent display screen according to claim 1, wherein the luminescent layer is a red-green-blue luminescent layer.