# US 2026/0076084 A1 · Display device including a dummy electrode, optical device and electronical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0076084 A1 - Document ID: US20260076084A1 - Status: Published application - Kind: A1 - Application number: 19/203,709 - Filed: 2025-05-09 - Published: 2026-03-12 - Earliest claimed: 2024-09-06 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Sung Hyun PARK; Joo Hong SEO; Seung Suk YANG - Web page: https://patentgrep.com/patent/US20260076084A1 ## CPC - H10K 59/88: Dummy elements, i.e. elements having non-functional features - G02B 27/0172: {characterised by optical features} - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/80516: {combined with auxiliary electrodes, e.g. ITO layer combined with metal lines} - H10K 59/878: {comprising reflective means} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - H10K 59/352: {the areas of the RGB subpixels being different} - H10K 59/38: comprising colour filters or colour changing media [CCM] - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A display device includes a substrate, first electrodes disposed on the substrate, a pixel defining layer disposed on the first electrodes and having a trench, a light emitting stack disposed on the first electrode and the pixel defining layer, and a dummy electrode disposed between the substrate and the trench, and between the first electrodes, wherein a voltage applied to the dummy electrode and a voltage applied to the first electrodes are different. ## Claims ### Claim 1 A display device comprising: a substrate; a plurality of first electrodes disposed on the substrate; a pixel defining layer disposed on the plurality of first electrodes and having a trench; a light emitting stack disposed on the plurality of first electrodes and the pixel defining layer; and a dummy electrode disposed between the substrate and the trench, and between the plurality of first electrodes, wherein a voltage applied to the dummy electrode and a voltage applied to the plurality of first electrodes are different. ### Claim 2 (depends on 1) The display device of claim 1, wherein the dummy electrode is connected to one of a ground, a first driving voltage line supplying a first driving voltage, or a third driving voltage line supplying an initialization voltage, and the voltage applied to the dummy electrode is smaller than the voltage applied to the plurality of first electrodes. ### Claim 3 (depends on 1) The display device of claim 1, wherein the dummy electrode overlaps the trench. ### Claim 4 (depends on 1) The display device of claim 1, wherein the trench defines a cavity, and a residual layer is disposed on a bottom surface of the trench below the cavity. ### Claim 5 (depends on 1) The display device of claim 1, further comprising an insulating layer disposed between the dummy electrode and the trench. ### Claim 6 (depends on 1) The display device of claim 1, wherein a bottom surface of the trench is disposed above, and spaced apart from, a top surface of the dummy electrode. ### Claim 7 (depends on 1) The display device of claim 1, wherein the dummy electrode and the trench are connected to each other, and a top surface of the dummy electrode defines a bottom surface of the trench. ### Claim 8 (depends on 1) The display device of claim 1, wherein the dummy electrode is disposed along the trench in a plan view. ### Claim 9 (depends on 1) The display device of claim 1, wherein the pixel defining layer has a plurality of trenches surrounding different emission areas, and the dummy electrode overlaps a plurality of neighboring trenches. ### Claim 10 (depends on 9) The display device of claim 9, wherein an edge of the dummy electrode overlaps the plurality of neighboring trenches. ### Claim 11 (depends on 10) The display device of claim 10, wherein a central portion of the dummy electrode overlaps the pixel defining layer between the plurality of neighboring trenches. ### Claim 12 (depends on 1) The display device of claim 1, wherein the dummy electrode does not overlap the trench, and the dummy electrode overlaps the pixel defining layer. ### Claim 13 (depends on 1) The display device of claim 1, wherein the pixel defining layer has a plurality of trenches surrounding different emission areas, and the dummy electrode overlaps a pixel defining layer between a plurality of neighboring trenches. ### Claim 14 (depends on 1) The display device of claim 1, wherein, in plan view, the dummy electrode surrounds an emission area and defines the pixel defining layer. ### Claim 15 (depends on 14) The display device of claim 14, wherein, in plan view, the dummy electrode has a through hole surrounding the emission area. ### Claim 16 (depends on 1) The display device of claim 1, wherein, between the substrate and the trench, the dummy electrode includes a plurality of dummy electrodes disposed along a direction toward the trench from the substrate. ### Claim 17 (depends on 1) The display device of claim 1, further comprising a reflective electrode connected to the first electrode, wherein the dummy electrode is disposed on a same layer as the reflective electrode, and the dummy electrode is formed of a same material as the reflective electrode. ### Claim 18 An optical device comprising: a display device; and an optical path changing member on the display device, wherein the display device comprises: a substrate; a plurality of first electrodes disposed on the substrate; a pixel defining layer disposed on the plurality of first electrodes, and having a trench; a light emitting stack disposed on the plurality of first electrodes and the pixel defining layer; and a dummy electrode disposed between the substrate and the trench, and between the plurality of first electrodes, wherein the dummy electrode defines a leakage current path from the plurality of first electrodes. ### Claim 19 (depends on 18) The optical device of claim 18, wherein the dummy electrode is connected to one of a ground, a first driving voltage line supplying a first driving voltage, or a third driving voltage line supplying an initialization voltage, and a voltage applied to the dummy electrode is smaller than a voltage applied to the plurality of first electrodes. ### Claim 20 An electronical device comprising: a display device including a display panel, wherein the display device comprises: a substrate; a plurality of first electrodes disposed on the substrate; a pixel defining layer disposed on the plurality of first electrodes, and having a trench; a light emitting stack disposed on the plurality of first electrodes and the pixel defining layer; and a dummy electrode disposed between the substrate and the trench, and between the plurality of first electrodes, wherein a voltage applied to the dummy electrode and a voltage applied to the plurality of first electrodes are different.