# US 12,604,647 B2 · Display panel and display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,647 B2 - Document ID: US12604647B2 - Status: Granted - Kind: B2 - Application number: 17/834,169 - Filed: 2022-06-07 - Published: 2022-09-29 - Granted: 2026-04-14 - Earliest claimed: 2020-06-22 - Assignees: Yungu (Gu'an) Technology Co., Ltd. - Applicants: Yungu (Gu'an) Technology Co., Ltd. - Inventors: Xiaokang Zhou; Zhenhua Lou; Qiqi Qin; Xiaocong Li; Hongyu Wang; Wenkai Chen - Web page: https://patentgrep.com/patent/US12604647B2 ## CPC - H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light} - H10K 59/8731: {multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers} - H10K 59/879: {comprising refractive means, e.g. lenses} - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 59/40: OLEDs integrated with touch screens - H10K 2102/351: {Thickness} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A display panel includes: a substrate; a light emitting unit located on the substrate; and one or more combinational structure layers located on a side of the light emitting unit away from the substrate, each of the combinational structure layers includes a first structure layer, a second structure layer and a third structure layer, a refractive index of the first structure layer is greater than a refractive index of the second structure layer, and the refractive index of the second structure layer is greater than a refractive index of the third structure layer. ## Claims ### Claim 1 A display panel, comprising: a substrate; a light emitting unit located on the substrate; one or more combinational structure layers located on a side of the light emitting unit away from the substrate, each of the combinational structure layers comprising a first structure layer, a second structure layer and a third structure layer, a refractive index of the first structure layer being greater than a refractive index of the second structure layer, and the refractive index of the second structure layer being greater than a refractive index of the third structure layer; an encapsulation layer stacked on the side of the light emitting unit away from the substrate; and a touch layer stacked on a side of the encapsulation layer away from the substrate, wherein the encapsulation layer comprises a part of one of the combinational structure layers, and the touch layer comprises another part of the one of the combinational structure layers; the encapsulation layer comprises a second inorganic film layer disposed toward the touch layer, the touch layer comprises a third inorganic film layer disposed toward the encapsulation layer, and a third auxiliary film layer being arranged between the third inorganic film layer and the second inorganic film layer; and in the one of the combinational structure layers, the first structure layer is the second inorganic film layer, the second structure layer is the third auxiliary film layer, and the third structure layer is the third inorganic film layer. ### Claim 2 (depends on 1) The display panel of claim 1, wherein the refractive index of the first structure layer is N1, the refractive index of the second structure layer is N2, the refractive index of the third structure layer is N3, and N1, N2 and N3 satisfy: N2=√{square root over (N1×N3)}. ### Claim 3 (depends on 1) The display panel of claim 1, wherein the encapsulation layer comprises at least a first inorganic film layer, and an organic film layer; the encapsulation layer further comprises a first auxiliary film layer located between the first inorganic film layer and the organic film layer, and in a same combinational structure layer, the first structure layer is the first inorganic film layer; and/or the encapsulation layer further comprises a second auxiliary film layer located between the organic film layer and the second inorganic film layer. ### Claim 4 (depends on 3) The display panel of claim 3, wherein the first auxiliary film layer is a single-layer structure layer; or the first auxiliary film layer is a composite structure layer comprising N stacked first film layers, and in a direction from the first inorganic film layer to the organic film layer, a refractive index of an i-th first film layer is greater than a refractive index of a (i+1)-th first film layer, N is a positive integer greater than or equal to 2, and i=1, 2, 3, . . . , N−1. ### Claim 5 (depends on 3) The display panel of claim 3, wherein a thickness d1 of the first auxiliary film layer satisfies: d1=(2k1−1)λ/4n1 wherein n1 is a refractive index of the first auxiliary film layer, λ is a wavelength of visible light, and k1 is a positive integer. ### Claim 6 (depends on 5) The display panel of claim 5, wherein the thickness d1 of the first auxiliary film layer is 60 nm- 120 nm. ### Claim 7 (depends on 3) The display panel of claim 3, wherein the first auxiliary film layer comprises a plurality of first auxiliary sub-layers arranged in an array, each of the first auxiliary sub-layers corresponds to sub-pixels of the display panel, and thicknesses of the first auxiliary sub-layers corresponding to sub-pixels emitting a same color are the same. ### Claim 8 (depends on 3) The display panel of claim 3, wherein a refractive index of the first inorganic film layer is 1.7-4.8, a refractive index of the first auxiliary film layer is 1.6-4.7, and a refractive index of the organic film layer is 1.4-1.6. ### Claim 9 (depends on 3) The display panel of claim 3, wherein the first auxiliary film layer and the first inorganic film layer have a same composition. ### Claim 10 (depends on 3) The display panel of claim 3, wherein the encapsulation layer further comprises the second auxiliary film layer located between the organic film layer and the second inorganic film layer; the second auxiliary film layer is a single-layer structure layer; or the second auxiliary film layer is a composite structure layer comprising M stacked second film layers, and in a direction from the organic film layer to the second inorganic film layer, a refractive index of a j-th second film layer is less than a refractive index of a (j+1)-th second film layer, M is a positive integer greater than or equal to 2, and j=1, 2, 3, . . . , M−1; the second auxiliary film layer is an inorganic material layer. ### Claim 11 (depends on 10) The display panel of claim 10, wherein a thickness d2 of the second auxiliary film layer satisfies: d2=(2k2−1)λ/4n2 wherein n2 is a refractive index of the second auxiliary film layer, λ is a wavelength of visible light, and k2 is a positive integer. ### Claim 12 (depends on 11) The display panel of claim 11, wherein the thickness d2 of the second auxiliary film layer is 60 nm- 120 nm. ### Claim 13 (depends on 1) The display panel of claim 1, wherein the third auxiliary film layer is a single-layer structure layer, or the third auxiliary film layer is a composite structure layer comprising W third film layers that are stacked, and in a direction from the second inorganic film layer to the third inorganic film layer, a refractive index of a p-th third film layer is greater than a refractive index of a (p+1)-th third film layer, W is a positive integer greater than or equal to 2, and p=1, 2, 3, . . . , W−1; a thickness d3 of the third auxiliary film layer satisfies: d3=(2k3−1)λ/4n3 wherein n3 is a refractive index of the third auxiliary film layer, λ is a wavelength of visible light, and k3 is a positive integer. ### Claim 14 (depends on 13) The display panel of claim 13, wherein the thickness d3 of the third auxiliary film layer is 60 nm- 120 nm. ### Claim 15 (depends on 1) A display apparatus comprising the display panel of claim 1. ### Claim 16 A display panel, comprising: a substrate; a light emitting unit located on the substrate; one or more combinational structure layers located on a side of the light emitting unit away from the substrate, each of the combinational structure layers comprising a first structure layer, a second structure layer and a third structure layer, a refractive index of the first structure layer being greater than a refractive index of the second structure layer, and the refractive index of the second structure layer being greater than a refractive index of the third structure layer; an encapsulation layer stacked on the side of the light emitting unit away from the substrate; and a touch layer stacked on a side of the encapsulation layer away from the substrate, wherein the touch layer comprising at least one of the combinational structure layers, or each of the encapsulation layer and the touch layer comprising at least one of the combinational structure layers, the touch layer comprises a fourth inorganic film layer, a second metal layer, and an optical adhesive layer that are stacked on the encapsulation layer, a fourth auxiliary film layer located between the fourth inorganic film layer and the second metal layer, and a fifth auxiliary film layer located between the second metal layer and the optical adhesive layer; and in a same combinational structure layer, the first structure layer is the fourth inorganic film layer, the second structure layer is the fourth auxiliary film layer, and the third structure layer is the fifth auxiliary film layer. ### Claim 17 (depends on 16) The display panel of claim 16, wherein the touch layer further comprises a third inorganic film layer and a first metal layer that are stacked on the encapsulation layer.