# US 12,772,706 B2 · Light emitting display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,772,706 B2 - Document ID: US12772706B2 - Status: Granted - Kind: B2 - Application number: 18/503,988 - Filed: 2023-11-07 - Published: 2024-07-04 - Granted: 2026-10-20 - Earliest claimed: 2022-12-29 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: In-Goo Lee; Hyeon-Hye Yu - Web page: https://patentgrep.com/patent/US12772706B2 ## CPC - H10K 59/878: {comprising reflective means} - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A light emitting display device includes a bank that is on a substrate and includes an opening corresponding to each of a plurality of pixel regions of a display region. The display device includes an inclined reflective portion that is below the bank and disposed in each of the plurality of pixel regions. The display device includes a light emitting diode disposed in the opening. Each of the plurality of pixel regions is configured such that the corresponding opening and reflective portion have a cardioid-shaped structure with a cusp. The plurality of pixel regions include a pixel region in which the cardioid-shaped structure is located in a first azimuth, and a pixel region in which the cardioid-shaped structure is located in a second azimuth opposite to the first azimuth. ## Claims ### Claim 1 A light emitting display device, comprising: a bank that is on a substrate and includes an opening corresponding to each of a plurality of pixel regions of a display region; an inclined reflective portion that is below the bank and disposed in each of the plurality of pixel regions; and a light emitting diode disposed in the opening, wherein each of the plurality of pixel regions is configured such that the corresponding opening and reflective portion have a cardioid-shaped structure with a cusp, and wherein the plurality of pixel regions includes a pixel region in which the cardioid-shaped structure is located in a first azimuth, and a pixel region in which the cardioid-shaped structure is located in a second azimuth opposite to the first azimuth. ### Claim 2 (depends on 1) The light emitting display device of claim 1, wherein within the display region, a number of the pixel region in the first azimuth and a number of the pixel region in the second azimuth are the same. ### Claim 3 (depends on 1) The light emitting display device of claim 1, wherein the pixel region in the first azimuth and the pixel region in the second azimuth are arranged alternately along one direction. ### Claim 4 (depends on 1) The light emitting display device of claim 1, wherein the plurality of pixel regions includes red, green, and blue pixel regions, and wherein the red, green, and blue pixel regions each include the pixel region in the first azimuth and the pixel region in the second azimuth. ### Claim 5 (depends on 1) The light emitting display device of claim 1, wherein the cardioid-shaped structure is defined as r=r0*(1+ε*cos (θ/2)), where θ is an azimuth angle, r0 is a radius at the cusp, r is a radius at θ, and ε is a deformation parameter. ### Claim 6 (depends on 1) The light emitting display device of claim 1, wherein the cardioid-shaped structure of the opening is configured to implement resonance for light in a horizontal direction of the corresponding pixel region. ### Claim 7 (depends on 1) The light emitting display device of claim 1, wherein the light emitting diode includes a first electrode, an emission layer on the first electrode, and a second electrode on the emission layer, and wherein the reflective portion extends from the first electrode. ### Claim 8 A light emitting display device, comprising: a light emitting diode that is in each of a plurality of pixel regions arranged in a display region on a substrate, and includes an emission layer forming an interface of a cardioid-shaped structure with a side surface of a bank; and an inclined reflective portion that is below the bank and disposed outside the interface, wherein the plurality of pixel regions includes a pixel region in which the cardioid-shaped structure is located in a first azimuth, and a pixel region in which the cardioid-shaped structure is located in a second azimuth opposite to the first azimuth, and wherein the reflective portion has the same cardioid-shaped structure as the interface of the corresponding pixel region. ### Claim 9 (depends on 8) The light emitting display device of claim 8, wherein within the display region, a number of the pixel region in the first azimuth and a number of the pixel region in the second azimuth are the same. ### Claim 10 (depends on 8) The light emitting display device of claim 8, wherein the pixel region in the first azimuth and the pixel region in the second azimuth are arranged alternately along one direction. ### Claim 11 (depends on 8) The light emitting display device of claim 8, wherein the plurality of pixel regions includes red, green, and blue pixel regions, and wherein the red, green, and blue pixel regions each include the pixel region in the first azimuth and the pixel region in the second azimuth. ### Claim 12 (depends on 8) The light emitting display device of claim 8, wherein the cardioid-shaped structure is defined as r=r0*(1+ε*cos (θ/2)), where θ is an azimuth angle, r0 is a radius at a cusp of the cardioid-shaped structure, r is a radius at θ, and ε is a deformation parameter. ### Claim 13 (depends on 8) The light emitting display device of claim 8, wherein the cardioid-shaped structure of the interface is configured to implement resonance for light in a horizontal direction of the corresponding pixel region. ### Claim 14 (depends on 8) The light emitting display device of claim 8, wherein the light emitting diode includes a first electrode and a second electrode respectively disposed below and on the emission layer, and wherein the reflective portion extends from the first electrode. ### Claim 15 A light emitting display device, comprising: an overcoat layer that is on a substrate and includes a concave groove corresponding to at least one pixel region; a first electrode including a reflective portion disposed along an inclined surface of the concave groove; a bank disposed on the first electrode and including an opening; and an organic emission layer and a second electrode disposed in the opening, wherein at least two of the concave groove, the reflective portion, and the opening are configured in a cardioid-shaped structure with a cusp. ### Claim 16 (depends on 15) The light emitting display device of claim 15, wherein the at least one pixel region includes a first emission region corresponding to the opening, and a second emission region corresponding to the reflective portion and surrounding the first emission region, and wherein the second emission region is in a black state or in a low luminance state at a section of the cusp to be discontinuous. ### Claim 17 (depends on 8) The light emitting display device of claim 8, wherein the bank includes an opening corresponding to each of the plurality of pixel regions, and wherein the opening has the same cardioid-shaped structure as the interface of the corresponding pixel region.