# US 10,481,306 B2 · Display panel and method of manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,306 B2 - Document ID: US10481306B2 - Status: Granted - Kind: B2 - Application number: 15/354,766 - Filed: 2016-11-17 - Published: 2017-06-08 - Granted: 2019-11-19 - Earliest claimed: 2015-12-03 - Assignees: Kabushiki Kaisha Tokai Rika Denki Seisakusho - Applicants: Kabushiki Kaisha Tokai Rika Denki Seisakusho - Inventors: Yoshinori Takano; Takeshi Fujimoto - Web page: https://patentgrep.com/patent/US10481306B2 ## CPC - G02B 5/003: {Light absorbing elements} - B44C 5/04: Ornamental plaques, e.g. decorative panels, decorative veneers - B44F 1/00: Designs or pictures characterised by special or unusual light effects - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B44C: PRODUCING DECORATIVE EFFECTS (processes for applying liquids or other fluent materials to surfaces, in general B05D; shaping of plastics or substances in a plastic state B29C; printing processes to produce transfer pictures B41M3/12; thermographic duplication or marking methods B41M5/00); MOSAICS; TARSIA WORK (imitation of mosaic or tarsia work patterns B44F11/04); PAPERHANGING {(labels G09F; multi-step processes for making paper labels or tags B31D1/02)} - B44F: SPECIAL DESIGNS OR PICTURES ## Abstract A display panel includes a base material that transmits light, a groove portion defined in a back surface of the base material and defined corresponding to a display pattern that is displayed on a front surface side of the base material, a light-blocking film, formed on the back surface where the groove portion is not defined and on a side surface of the groove portion, that blocks light through the back surface, a light-transmissive region that includes a region on an upper surface of the groove portion where the light-blocking film is not formed and that transmits light, and a metal film formed in at least the light-transmissive region. ## Claims ### Claim 1 A display panel, comprising: a base material that transmits light and that is formed in a plate shape; a groove portion defined in a back surface of the base material and defined corresponding to a display pattern that is displayed on a front surface side of the base material; a light-blocking film, formed on the back surface where the groove portion is not defined and on a side surface of the groove portion, that blocks light through the back surface; a light-transmissive region that comprises a region on an upper surface of the groove portion where the light-blocking film is not formed and that transmits light; and a metal film formed in at least the light-transmissive region, wherein the metal film overlies the light-blocking film, and is of such a thickness that it transmits light, wherein the light-blocking film is configured to reduce an intensity of light transmitted therethrough, and wherein the light-blocking film is configured to have a light transmittance of not more than 1%. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein the light-blocking film suppresses reflection of light entering through the front surface side of the base material. ### Claim 3 (depends on 1) The display panel according to claim 1, wherein the light-blocking film is formed covering an entirety of the side surface of the groove portion. ### Claim 4 (depends on 1) The display panel according to claim 1, wherein the upper surface of the groove portion is parallel to a front surface of the base material. ### Claim 5 (depends on 1) The display panel according to claim 1, wherein the metal film on the light-transmissive region is more than a half of a thickness of the base material away from the light-blocking film on the back surface. ### Claim 6 (depends on 1) The display panel according to claim 1, wherein the light-blocking film is formed covering only one or more side surfaces of the groove portion. ### Claim 7 (depends on 1) The display panel according to claim 1, wherein the light-blocking film is formed covering an entirety of opposing side surfaces of the groove portion. ### Claim 8 A method of manufacturing a display panel, comprising: defining a groove portion in a back surface of a base material corresponding to a display pattern, the base material being formed in a plate shape; forming a light-blocking film that blocks light on the back surface and on the groove portion by applying a material of the light-blocking film to the back surface such that the light-blocking film covers an entirety of the back surface; forming a light-transmissive region that transmits light by removing the light-blocking film on an upper surface of the groove portion; and forming a metal film in at least the light-transmissive region of such a thickness that it transmits light, wherein the light-blocking film is configured to reduce an intensity of light transmitted therethrough, and wherein the light-blocking film is configured to have a light transmittance of not more than 1%.