# US 10,872,943 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,943 B2 - Document ID: US10872943B2 - Status: Granted - Kind: B2 - Application number: 16/522,025 - Filed: 2019-07-25 - Published: 2020-02-06 - Granted: 2020-12-22 - Earliest claimed: 2018-07-31 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Changhwa Jun - Web page: https://patentgrep.com/patent/US10872943B2 ## CPC - H10K 59/124: Insulating layers formed between TFT elements and OLED elements - H10K 59/1213: {the pixel elements being TFTs} - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/80515: {characterised by their shape} - H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers} - H10K 59/878: {comprising reflective means} - H10D 86/451: {characterised by the compositions or shapes of the interlayer dielectrics} - H10D 86/60: wherein the TFTs are in active matrices - H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT] - H10K 59/8731: {multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers} - H10K 2102/3026: {Top emission} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract A display device includes a substrate provided with a plurality of subpixel areas, a circuit element layer provided on the substrate and provided with a transistor for each subpixel area, an insulating layer provided on the circuit element layer and provided with a recessed portion formed to overlap the transistor, a reflective electrode provided on the insulating layer and provided in the recessed portion, a first electrode provided on the reflective electrode while being overlapped with the recessed portion, an organic light emitting layer provided on the first electrode, a bank provided between the subpixel areas while covering an end of the first electrode, and a second electrode provided on the organic light emitting layer, wherein the recessed portion, the reflective electrode and the first electrode may be provided with N stages, wherein N is an integer greater than 1, whereby light efficiency may be improved. ## Claims ### Claim 1 A display device comprising: a substrate provided with a plurality of subpixel areas; a circuit element layer provided on the substrate and provided with a transistor for each subpixel area; an insulating layer provided on the circuit element layer and provided with a recessed portion formed to overlap the transistor in a direction perpendicular to a longest plane of the substrate; a reflective electrode provided on the insulating layer and provided in the recessed portion; a first electrode provided on the reflective electrode while being overlapped with the recessed portion; an organic light emitting layer provided on the first electrode; a bank provided between the subpixel areas while covering an end of the first electrode; and a second electrode provided on the organic light emitting layer, wherein the recessed portion, the reflective electrode and the first electrode are provided with N stages, wherein N is an integer greater than 1. ### Claim 2 (depends on 1) The display device of claim 1, wherein the reflective electrode includes: a plurality of first reflective electrodes parallel with the substrate; and a plurality of second reflective electrodes inclined with respect to the substrate. ### Claim 3 (depends on 2) The display device of claim 2, wherein the first reflective electrodes are arranged at their respective heights different from each other based on the substrate. ### Claim 4 (depends on 1) The display device of claim 1, wherein the circuit element layer includes a through hole formed at a portion where the recessed portion is overlapped with the transistor, and the reflective electrode is in contact with the transistor through the through hole. ### Claim 5 (depends on 4) The display device of claim 4, wherein the recessed portion, the reflective electrode and the first electrode are arranged symmetrically based on the through hole. ### Claim 6 (depends on 2) The display device of claim 2, wherein each of the second reflective electrodes has a first angle with the substrate, and the first angle ranges from 20° to 70°. ### Claim 7 (depends on 2) The display device of claim 2, wherein the first electrode includes a plurality of first sub electrodes which are in contact with the first reflective electrodes and a plurality of second sub electrodes which are in contact with the second reflective electrodes, the organic light emitting layer includes a plurality of first organic light emitting layers which are in contact with the first sub electrodes, and a plurality of second organic light emitting layers which are in contact with the second sub electrodes, and the first organic light emitting layers are thicker than the second organic light emitting layers. ### Claim 8 (depends on 7) The display device of claim 7, wherein the second sub electrodes are spaced apart from each other at a first spaced distance which is increased at a longer distance from the substrate. ### Claim 9 (depends on 8) The display device of claim 8, wherein the first spaced distance is 0.14 in or more. ### Claim 10 (depends on 3) The display device of claim 3, wherein the recessed portion includes: a first recessed portion arranged at one side of the subpixel area; a second recessed portion arranged at the other side of the subpixel area; and a convex portion arranged between the first recessed portion and the second recessed portion. ### Claim 11 (depends on 10) The display device of claim 10, wherein each of the second reflective electrodes respectively arranged on the first and second recessed portions and the convex portion has a second angle with the substrate, and the second angle ranges from 20° to 70°. ### Claim 12 (depends on 10) The display device of claim 10, wherein the transistor is provided to overlap any one of the first recessed portion and the second recessed portion. ### Claim 13 (depends on 12) The display device of claim 12, wherein the first reflective electrode arranged on each of the first recessed portion and the second recessed portion is connected to the transistor. ### Claim 14 (depends on 10) The display device of claim 10, wherein the first reflective electrode arranged on the convex portion is arranged at the same height as that of at least one of the plurality of first reflective electrodes arranged on the first recessed portion. ### Claim 15 (depends on 10) The display device of claim 10, wherein the second reflective electrode includes a first recessed reflective electrode arranged on the first recessed portion and a second recessed reflective electrode arranged on the second recessed portion, and the first recessed reflective electrode and the second recessed reflective electrode are symmetrical based on the convex portion. ### Claim 16 (depends on 15) The display device of claim 15, wherein the second reflective electrode includes a first convex reflective electrode arranged on the convex portion to face the first recessed reflective electrode, and a second convex reflective electrode arranged on the convex portion to face the second recessed reflective electrode, the first electrode includes a first recessed sub electrode which is in contact with the first recessed reflective electrode, a first convex sub electrode which is in contact with the first convex reflective electrode, a second recessed sub electrode which is in contact with the second recessed reflective electrode, and a second convex sub electrode which is in contact with the second convex reflective electrode, the first recessed sub electrode and the first convex sub electrode are spaced apart from each other at a second spaced distance and the second recessed sub electrode and the second convex sub electrode are spaced apart from each other at a third spaced distance, and the second spaced distance and the third spaced distance are equal to each other. ### Claim 17 (depends on 16) The display device of claim 16, wherein the second spaced distance is 0.14 μm or more. ### Claim 18 (depends on 1) The display device of claim 1, further comprising a lens array spaced apart from the substrate, and a storage case storing the substrate and the lens array. ### Claim 19 (depends on 1) The display device of claim 1, wherein the recessed portion is a contact hole for connecting the reflective electrode or the first electrode to the transistor and used as a light emitting area. ### Claim 20 (depends on 10) The display device of claim 10, wherein the transistor is connected to the first reflective electrode provided on at least one of the first recessed portion and the second recessed portion.