# US 11,308,726 B2 · Display device and fabricating method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,308,726 B2 - Document ID: US11308726B2 - Status: Granted - Kind: B2 - Application number: 16/615,499 - Filed: 2018-12-11 - Published: 2021-11-25 - Granted: 2022-04-19 - Earliest claimed: 2018-10-15 - Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Haoran Cao; Pilgeun Chun - Web page: https://patentgrep.com/patent/US11308726B2 ## CPC - G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing} - G06V 40/1324: {by using geometrical optics, e.g. using prisms (G06V40/1312 takes precedence)} - H10K 59/40: OLEDs integrated with touch screens - H10K 59/65: OLEDs integrated with inorganic image sensors - H10K 71/80: using temporary substrates - H10K 85/10: Organic polymers or oligomers - H10K 59/1201: {Manufacture or treatment} - H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light} - H10K 2102/311: {Flexible OLED} - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A display device and a fabricating method thereof are provided. The display device has a display panel and an optical fingerprint recognition sensor. The display panel has a transparent organic material layer, a barrier layer, a buffer layer, and an array substrate sequentially stacked and disposed from bottom to top. A surface of the transparent organic material layer opposite to the barrier layer is a back surface of the transparent organic material layer. The optical fingerprint recognition sensor is disposed on the back surface of the transparent organic material layer. ## Claims ### Claim 1 A display device, comprising a display panel and an optical fingerprint recognition sensor, the display panel comprising a transparent organic material layer, a barrier layer, a buffer layer, and an array substrate sequentially stacked and disposed from bottom to top, wherein a surface of the transparent organic material layer opposite to the barrier layer is a back surface of the transparent organic material layer, and the optical fingerprint recognition sensor is disposed on the back surface of the transparent organic material layer, wherein the back surface of the transparent organic material layer is provided with a groove, the optical fingerprint recognition sensor is disposed in the groove, and the transparent organic material layer is a polyester film layer. ### Claim 2 (depends on 1) The display device according to claim 1, wherein material of the buffer layer is at least one of silicon nitride and silicon oxide. ### Claim 3 (depends on 1) The display device according to claim 1, wherein a number of the optical fingerprint recognition sensor is plural, and the plurality of optical fingerprint recognition sensors are distributed on the back surface of the transparent organic material layer, wherein positions of the optical fingerprint recognition sensors correspond to a part of display areas or all of the display areas of the display panel. ### Claim 4 (depends on 3) The display device according to claim 3, wherein the plurality of optical fingerprint recognition sensors are distributed on the back surface of the transparent organic material layer in arrays. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the display panel is a flexible active matrix/organic light emitting diode (AMOLED) display panel, and the display panel further comprises an electroluminescent layer, a thin film encapsulation layer, a touch layer, a polarizing sheet, and a cover plate. ### Claim 6 A display device, comprising a display panel and an optical fingerprint recognition sensor, the display panel comprising a transparent organic material layer, a barrier layer, a buffer layer, and an array substrate sequentially stacked and disposed from bottom to top, wherein a surface of the transparent organic material layer opposite to the barrier layer is a back surface of the transparent organic material layer, and the optical fingerprint recognition sensor is disposed on the back surface of the transparent organic material layer. ### Claim 7 (depends on 6) The display device according to claim 6, wherein the back surface of the transparent organic material layer is provided with a groove, and the optical fingerprint recognition sensor is disposed in the groove. ### Claim 8 (depends on 6) The display device according to claim 6, wherein material of the buffer layer is at least one of silicon nitride and silicon oxide. ### Claim 9 (depends on 6) The display device according to claim 6, wherein the transparent organic material layer is a polyester film layer. ### Claim 10 (depends on 6) The display device according to claim 6, wherein a number of the optical fingerprint recognition sensor is plural, and the plurality of optical fingerprint recognition sensors are distributed on the back surface of the transparent organic material layer, wherein positions of the optical fingerprint recognition sensors correspond to a part of display areas or all of the display areas of the display panel. ### Claim 11 (depends on 10) The display device according to claim 10, wherein the plurality of optical fingerprint recognition sensors are distributed on the back surface of the transparent organic material layer in arrays. ### Claim 12 (depends on 6) The display device according to claim 6, wherein the display panel is a flexible active matrix/organic light emitting diode (AMOLED) display panel, and the display panel further comprises an electroluminescent layer, a thin film encapsulation layer, a touch layer, a polarizing sheet, and a cover plate. ### Claim 13 A fabricating method of a display device, comprising steps of: providing a base plate; forming a buffer layer and an array substrate on the base plate in sequence; removing the base plate, and forming a barrier film layer on a surface of the buffer layer opposite to the array substrate; forming a transparent organic material layer on a surface of the barrier film layer opposite to the buffer layer, wherein a surface of the transparent organic material layer opposite to the barrier layer is a back surface of the transparent organic material layer; and mounting an optical fingerprint recognition sensor on the back surface of the transparent organic material layer. ### Claim 14 (depends on 13) The fabricating method according to claim 13, wherein after forming the transparent organic material layer on the surface of the barrier film layer opposite to the buffer layer, the fabricating method further comprises: forming a groove on the back surface of the transparent organic material layer, wherein the step of mounting the optical fingerprint recognition sensor on the back surface of the transparent organic material layer comprises mounting the optical fingerprint recognition sensor in the groove. ### Claim 15 (depends on 13) The fabricating method according to claim 13, wherein the step of providing the base plate comprises: providing a glass plate; and forming a polyimide film layer on the glass plate to form the base plate, wherein the step of removing the base plate comprises separating the glass plate from the polyimide film layer by a laser lift-off process, and then separating the polyimide film layer from the buffer layer by the laser lift-off process to remove the base plate. ### Claim 16 (depends on 13) The fabricating method according to claim 13, wherein after the step of forming the buffer layer and the array substrate on the substrate in sequence further comprises: forming an electroluminescent layer, a thin film encapsulation layer, and a touch layer on the array substrate in sequence; and forming a polarizing sheet or a protective film on the touch layer. ### Claim 17 (depends on 13) The fabricating method according to claim 13, wherein the transparent organic material layer is a polyester film layer. ### Claim 18 (depends on 13) The fabricating method according to claim 13, wherein material of the buffer layer is at least one of silicon nitride and silicon oxide. ### Claim 19 (depends on 13) The fabricating method according to claim 13, wherein a number of the optical fingerprint recognition sensor is plural, and positions of the plurality of optical fingerprint recognition sensors correspond to a part of display areas or all of the display areas of the display device.