# US 2023/0273698 A1 · Touch substrate having layers with varying refractive index, touch displaying device, and manufacturing method of touch substrate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0273698 A1 - Document ID: US20230273698A1 - Status: Published application - Kind: A1 - Application number: 18/312,038 - Filed: 2023-05-04 - Published: 2023-08-31 - Earliest claimed: 2020-11-18 - Assignees: Wuhan BOE Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Wuhan Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Inventors: Xia Shi; Yuanhui Guo; Jie Han; Jian Zhao; Peipei Zhang; Yujie Gao - Web page: https://patentgrep.com/patent/US20230273698A1 ## CPC - G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0443: {using a single layer of sensing electrodes} - G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - G06F 2203/04111: Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate - G06F 2203/04112: Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A touch substrate includes a base plate; touch electrodes; and at least three light adjustment layers stacked on a side of the base plate, and adjacent two of the light adjustment layers have different refractive indexes; the touch electrodes include a first touch electrode and a second touch electrode that are disposed on a side, backing onto the light adjustment layers, of the base plate, the second touch electrode is disposed on a side, backing onto the base plate, of the first touch electrode; the touch substrate further includes: a first insulating layer disposed between the base plate and the first touch electrode; a second insulating layer disposed between the first touch electrode and the second touch electrode; and a third insulating layer disposed on a side, backing onto the base plate, of the second touch electrode. ## Claims ### Claim 1 A touch substrate, comprising: a base plate; touch electrodes; and at least three light adjustment layers stacked on a side of the base plate, wherein adjacent two of the light adjustment layers have different refractive indexes; wherein the touch electrodes comprise a first touch electrode and a second touch electrode that are disposed on a side, backing onto the light adjustment layers, of the base plate, the second touch electrode is disposed on a side, backing onto the base plate, of the first touch electrode; wherein the touch substrate further comprises: a first insulating layer disposed between the base plate and the first touch electrode; a second insulating layer disposed between the first touch electrode and the second touch electrode; and a third insulating layer disposed on a side, backing onto the base plate, of the second touch electrode. ### Claim 2 (depends on 1) The touch substrate according to claim 1, wherein the light adjustment layers comprises a first light adjustment layer, a second light adjustment layer, a third light adjustment layer, a fourth light adjustment layer and a fifth light adjustment layer stacked in sequence, wherein the fifth light adjustment layer is disposed close to the base plate, the first light adjustment layer is disposed far away from the base plate; wherein the refractive indexes of the first light adjustment layer, the third light adjustment layer and the fifth light adjustment layer are less than the refractive indexes of the second light adjustment layer and the fourth light adjustment layer. ### Claim 3 (depends on 2) The touch substrate according to claim 2, wherein the first light adjustment layer, the third light adjustment layer and the fifth light adjustment layer are made from at least one of silicon dioxide and magnesium fluoride, and the second light adjustment layer and the fourth light adjustment layer are made from at least one of titanium dioxide and niobium oxide. ### Claim 4 (depends on 3) The touch substrate according to claim 3, wherein when a host material of the first light adjustment layer, the third light adjustment layer and the fifth light adjustment layer is silicon dioxide and the host material of the second light adjustment layer and the fourth light adjustment layer is niobium oxide, a thickness of the fifth light adjustment layer is greater than thicknesses of the first light adjustment layer, the second light adjustment layer, the third light adjustment layer and the fourth light adjustment layer, the thicknesses of the second light adjustment layer and the fourth light adjustment layer are greater than thicknesses of the first light adjustment layer and the third light adjustment layer. ### Claim 5 (depends on 4) The touch substrate according to claim 4, wherein the thicknesses of the first light adjustment layer, the second light adjustment layer, the third light adjustment layer, the fourth light adjustment layer and the fifth light adjustment layer are all greater than or equal to 50 nm, and less than or equal to 150 nm. ### Claim 6 (depends on 1) The touch substrate according to claim 1, wherein the first insulating layer and the second insulating layer have different refractive indexes, and the third insulating layer and the second insulating layer have different refractive indexes. ### Claim 7 (depends on 6) The touch substrate according to claim 6, wherein the refractive index of the second insulating layer is less than the refractive indexes of the first insulating layer and the third insulating layer. ### Claim 8 (depends on 7) The touch substrate according to claim 7, wherein the first insulating layer and the third insulating layer are made from at least one of titanium dioxide and niobium oxide; the second insulating layer is made from at least one of silicon dioxide and magnesium fluoride. ### Claim 9 (depends on 1) The touch substrate according to claim 1, wherein the light adjustment layers comprise a sixth light adjustment layer, a seventh light adjustment layer, and an eighth light adjustment layer stacked in sequence, wherein the sixth light adjustment layer is disposed close to the base plate, the eighth light adjustment layer is disposed far away from the base plate, and the refractive index of the seventh light adjustment layer is less than refractive indexes of the sixth light adjustment layer and the eighth light adjustment layer. ### Claim 10 (depends on 9) The touch substrate according to claim 9, wherein the sixth light adjustment layer and the eighth light adjustment layer are made from at least one of titanium dioxide and niobium oxide, the seventh light adjustment layer is made from at least one of silicon dioxide and magnesium fluoride. ### Claim 11 (depends on 9) The touch substrate according to claim 9, wherein when host materials of the sixth light adjustment layer and the eighth light adjustment layer are niobium oxide, the host material of the seventh light adjustment layer is silicon dioxide, thicknesses of the sixth light adjustment layer and the eighth light adjustment layer are both greater than or equal to 100 nm, and less than or equal to 130 nm; the thickness of the seventh light adjustment layer is greater than or equal to 80 nm, and less than or equal to 110 nm. ### Claim 12 (depends on 1) The touch substrate according to claim 1, wherein the first touch electrode and the second touch electrode intersect with each other, and form metal grids. ### Claim 13 (depends on 12) The touch substrate according to claim 12, wherein the metal grids comprise: a first metal grid formed by intersection of the first touch electrode, wherein the first metal grid comprises a first node located at a crossing point of the first touch electrode, and a first hollow area surrounded by the first touch electrode; and a second metal grid formed by intersection of the second touch electrode, wherein the second metal grid comprises a second node located at a crossing point of the second touch electrode, and a second hollow area surrounded by the second touch electrode; wherein an orthographic projection of the first node on the base plate is located at a center of the orthographic projection of the second hollow area on the base plate, and the orthographic projection of the second node on the base plate is located at a center of the orthographic projection of the first hollow area on the base plate. ### Claim 14 (depends on 12) The touch substrate according to claim 12, wherein the first touch electrode and the second touch electrode have an uneven surface on a side facing away from the base plate. ### Claim 15 (depends on 1) A touch displaying device, comprising a display panel and the touch substrate according to claim 1, wherein the touch substrate is located on a light emitting side of the display panel. ### Claim 16 (depends on 15) The touch displaying device according to claim 15, wherein the display panel is located on the side, backing onto the light adjustment layers, of the base plate. ### Claim 17 (depends on 15) The touch displaying device according to claim 15, wherein the touch substrate and the display panel are bonded with an optically clear adhesive. ### Claim 18 A manufacturing method of a touch substrate, comprising: providing a base plate; forming at least three light adjustment layers on a side of the base plate sequentially, wherein refractive indexes of adjacent light adjustment layers are different; and forming a first insulating layer, a first touch electrode, a second insulating layer, a second touch electrode and a third insulating layer on a side, backing onto the light adjustment layers, of the base plate sequentially. ### Claim 19 (depends on 18) The manufacturing method according to claim 18, wherein the forming at least three light adjustment layers on a side of the base plate sequentially comprises: forming a fifth light adjustment layer on a side of the base plate; forming a fourth light adjustment layer on a side, backing onto the base plate, of the fifth light adjustment layer; forming a third light adjustment layer on a side, backing onto the base plate, of the fourth light adjustment layer; forming a second light adjustment layer on a side, backing onto the base plate, of the third light adjustment layer; and forming a first light adjustment layer on a side, backing onto the base plate, of the second light adjustment layer; wherein the refractive indexes of the first light adjustment layer, the third light adjustment layer and the fifth light adjustment layer are less than the refractive indexes of the second light adjustment layer and the fourth light adjustment layer. ### Claim 20 (depends on 19) The manufacturing method according to claim 19, wherein a DC magnetron sputtering process is used to form the second light adjustment layer and the fourth light adjustment layer, and a radio frequency magnetron sputtering process is used to form the first light adjustment layer, the third light adjustment layer and the fifth light adjustment layer.