# US 12,015,109 B2 · Display panel 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 12,015,109 B2 - Document ID: US12015109B2 - Status: Granted - Kind: B2 - Application number: 17/473,030 - Filed: 2021-09-13 - Published: 2021-12-30 - Granted: 2024-06-18 - Earliest claimed: 2019-09-20 - Assignees: KunShan Go-Visionox Opto-Electronics Co., Ltd - Applicants: Kunshan Go-Visionox Opto-Electronics Co., Ltd - Inventors: Chunliang Yao; Xiaokang Zhou; Mengzhen Li; Huashan Bao - Web page: https://patentgrep.com/patent/US12015109B2 ## CPC - H10H 20/854: characterised by their material, e.g. epoxy or silicone resins - H10H 20/853: characterised by their shape - H10H 20/855: Optical field-shaping means, e.g. lenses - H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout} - H10W 90/00: Package configurations - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A display panel and a display device. The display panel includes a substrate, at least three different light-emitting units disposed on the substrate, and at least three different buffer encapsulation layers disposed on the side of the at least three different light-emitting units facing away from the substrate. The at least three different light-emitting units emit at least three different colors. The thickness of at least one buffer encapsulation layer corresponding to at least one light-emitting unit among the at least three different light-emitting units is different from the respective thicknesses of the other buffer encapsulation layers corresponding to the other light-emitting units among the at least three different light-emitting units. ## Claims ### Claim 1 A display panel, comprising: a substrate; at least three different light-emitting units disposed on the substrate and emitting at least three different colors; and at least three buffer encapsulation layers disposed on a side of the at least three different light-emitting units facing away from the substrate, wherein the at least three buffer encapsulation layers are in one-to-one correspondence with the at least three different light-emitting units, a thickness of at least one buffer encapsulation layer corresponding to at least one light-emitting unit among the at least three different light-emitting units is different from respective thicknesses of the other buffer encapsulation layers corresponding to the other light-emitting units among the at least three different light-emitting units, and thicknesses of cathode layer of the at least three different light-emitting units vary in proportion to rates at which brightness of light emitted from each light-emitting unit decays. ### Claim 2 (depends on 1) The display panel of claim 1, further comprising: a plurality of light extraction layers disposed on one side of the at least three buffer encapsulation layers adjacent to the at least three different light-emitting units; wherein a thickness of at least one light extraction layer corresponding to at least one light-emitting unit among the at least three different light-emitting units is different from respective thicknesses of the other light extraction layers corresponding to the other light-emitting units among the at least three different light-emitting units. ### Claim 3 (depends on 2) The display panel of claim 2, wherein the at least three different light-emitting units comprise a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit; wherein a wavelength of light emitted from the first light-emitting unit is greater than a wavelength of light emitted from the second light-emitting unit, and the wavelength of the light emitted from the second light-emitting unit is greater than a wavelength of light emitted from the third light-emitting unit. ### Claim 4 (depends on 3) The display panel of claim 3, wherein as a viewing angle increases in a range, a rate at which a brightness of the light emitted from the first light-emitting unit decays is greater than a rate at which a brightness of the light emitted from the second light-emitting unit decays and a rate at which a brightness of the light emitted from the third light-emitting unit decays respectively, and a thickness of a buffer encapsulation layer corresponding to the first light-emitting unit is greater than a thickness of a buffer encapsulation layer corresponding to the second light-emitting unit and a thickness of a buffer encapsulation layer corresponding to the third light-emitting unit respectively. ### Claim 5 (depends on 3) The display panel of claim 3, wherein as a viewing angle increases in a range, a rate at which a brightness of the light emitted from the second light-emitting unit decays is greater than a rate at which a brightness of the light emitted from the first light-emitting unit decays and a rate at which a brightness of the light emitted from the third light-emitting unit decays respectively, and a thickness of a buffer encapsulation layer corresponding to the second light-emitting unit is less than a thickness of a buffer encapsulation layer corresponding to the first light-emitting unit and a thickness of a buffer encapsulation layer corresponding to the third light-emitting unit respectively. ### Claim 6 (depends on 3) The display panel of claim 3, wherein as a viewing angle increases in a range, a rate at which a brightness of the light emitted from the third light-emitting unit decays is greater than a rate at which a brightness of the light emitted from the first light-emitting unit decays and a rate at which a brightness of the light emitted from the second light-emitting unit decays respectively, and a thickness of a buffer encapsulation layer corresponding to the third light-emitting unit is greater than a thickness of a buffer encapsulation layer corresponding to the first light-emitting unit and a thickness of a buffer encapsulation layer corresponding to the second light-emitting unit respectively. ### Claim 7 (depends on 4) The display panel of claim 4, wherein a thickness of a light extraction layer corresponding to the first light-emitting unit is less than a thickness of a light extraction layer corresponding to the second light-emitting unit and a thickness of a light extraction layer corresponding to the third light-emitting unit respectively. ### Claim 8 (depends on 4) The display panel of claim 4, wherein a thickness of a light extraction layer corresponding to the second light-emitting unit is less than a thickness of a light extraction layer corresponding to the first light-emitting unit and a thickness of a light extraction layer corresponding to the third light-emitting unit, respectively. ### Claim 9 (depends on 4) The display panel of claim 4, wherein a thickness of a light extraction layer corresponding to the third light-emitting unit is greater than a thickness of a light extraction layer corresponding to the first light-emitting unit and a thickness of a light extraction layer corresponding to the second light-emitting unit respectively. ### Claim 10 (depends on 1) The display panel of claim 1, wherein a material of one of the at least three buffer encapsulation layers comprises lithium fluoride (LiF) or calcium fluoride (CaF2). ### Claim 11 (depends on 3) The display panel of claim 3, wherein one of the at least three different light-emitting units comprises an anode, a light-emitting layer, and a cathode layer. ### Claim 12 A display panel comprising: a substrate; at least three different light-emitting units disposed on the substrate and emitting at least three different colors; and at least three buffer encapsulation layers disposed on a side of the at least three different light-emitting units facing away from the substrate, wherein the at least three buffer encapsulation layers are in one-to-one correspondence with the at least three different light-emitting units, a thickness of at least one buffer encapsulation layer corresponding to at least one light-emitting unit among the at least three different light-emitting units is different from respective thicknesses of the other buffer encapsulation layers corresponding to the other light-emitting units among the at least three different light-emitting units, one of the at least three different light-emitting units comprises an anode, a light-emitting layer, and a cathode layer, and as a viewing angle increases in a range, a rate at which a brightness of the light emitted from the third light-emitting unit decays is greater than a rate at which a brightness of the light emitted from the first light-emitting unit decays and a rate at which a brightness of the light emitted from the second light-emitting unit decays respectively, and a thickness of the cathode layer of the third light-emitting unit is less than a thickness of the cathode layer of the first light-emitting unit and a thickness of the cathode layer of the second light-emitting unit respectively. ### Claim 13 (depends on 1) The display panel of claim 1, wherein a thickness of one of the at least three buffer encapsulation layers is in a range from 30 nm to 80 nm. ### Claim 14 (depends on 2) The display panel of claim 2, wherein a thickness of one of the light extraction layers is in a range from 50 nm to 120 nm. ### Claim 15 (depends on 11) The display panel of claim 11, wherein a thickness of the cathode layer of each of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is in a range from 15 nm to 23 nm. ### Claim 16 (depends on 3) The display panel of claim 3, wherein a color of light emitted from the first light-emitting unit is red, a color of light emitted from the second light-emitting unit is green, and a color of light emitted from the third light-emitting unit is blue. ### Claim 17 A display device, comprising a display panel, wherein the display panel comprises: a substrate; at least three different light-emitting units disposed on the substrate and emitting at least three different colors; and at least three buffer encapsulation layers disposed on a side of the at least three different light-emitting units facing away from the substrate, wherein the at least three buffer encapsulation layers are in one-to-one correspondence with the at least three different light-emitting units, a thickness of at least one buffer encapsulation layer corresponding to at least one light-emitting unit among the at least three different light-emitting units is different from respective thicknesses of the other buffer encapsulation layers corresponding to the other light-emitting units among the at least three different light-emitting units, and thicknesses of each cathode layer of the at least three different light-emitting units vary in proportion to rates at which brightness of light emitted from each light-emitting unit decays. ### Claim 18 (depends on 17) The A-display device of claim 17, wherein the display device is used in a mobile phone, a wearable device with a display function, or a computer. ### Claim 19 A display panel, comprising: a substrate; at least three different light-emitting units disposed on the substrate and configured to emit at least three different colors; at least three buffer encapsulation layers disposed on a side of the at least three different light-emitting units facing away from the substrate, wherein the at least three buffer encapsulation layers are in one-to-one correspondence with the at least three different light-emitting units and one of the at least three different light-emitting units comprises an anode, a light-emitting layer, and a cathode layer, and the plurality of light extraction layers is in direct contact with the cathode layer; and a plurality of light extraction layers disposed on one side of the at least three buffer encapsulation layers adjacent to the at least three different light-emitting units, wherein a thickness of at least one buffer encapsulation layer corresponding to at least one light-emitting unit among the at least three different light-emitting units is different from respective thicknesses of the other buffer encapsulation layers corresponding to the other light-emitting units among the at least three different light-emitting units. ### Claim 20 (depends on 19) The display panel of claim 19, wherein a refractive index of the at least three buffer encapsulation layers is less than a refractive index of the plurality of light extraction layers, and the at least three buffer encapsulation layers are at a same layer.