# US 7,608,991 B2 · Light emitting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,991 B2 - Document ID: US7608991B2 - Status: Granted - Kind: B2 - Application number: 11/280,684 - Filed: 2005-11-16 - Published: 2006-05-18 - Granted: 2009-10-27 - Earliest claimed: 2004-11-16 - Assignees: KYOCERA Corporation - Inventors: Shinichi Abe; Motohiko Asano; Kazumasa Kobayashi; Koji Murayama - Web page: https://patentgrep.com/patent/US7608991B2 ## CPC - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 59/873: {Encapsulations} - H10K 59/875: {Arrangements for extracting light from the devices} - H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair} - H10K 59/879: {comprising refractive means, e.g. lenses} - H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light} - H10K 2102/351: {Thickness} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract There is provided a light emitting device having a plurality of luminous elements emitting with different colors respectively being improved in a luminous intensity deviation and a color deviation without deterioration of a luminous efficiency. In the light emitting device having a plurality of luminous elements respectively emitting with different colors, both a traveling wave of light and a reflected wave of light enhance intensity of light. ## Claims ### Claim 1 A light emitting device comprising: a plurality of luminous elements emitting different colors, respectively, each element including a first electrode, a second electrode transmitting light, and a luminous layer disposed between an upper surface of the first electrode and a lower surface of the second electrode; a protecting layer covering the plurality of luminous elements, placed on an upper surface of the second electrode; and a control layer placed on the upper surface of the second electrode of one luminous element or more in the plurality of luminous elements, wherein when an interval from an upper surface of an uppermost layer among layers placed on an upper surface of the second electrode to the upper surface of the second electrode is defined as a first interval, an interval from a lower surface of the second electrode to the upper surface of the uppermost layer is defined as a second interval, and an interval from the upper surface of the first electrode to the upper surface of the uppermost layer is defined as a third interval, the first through the third intervals include a region outside of the luminous element, and optical distances of the respective intervals are set such that both a traveling wave of light and a reflected wave of light traveling within at least the first interval in the first through third intervals enhance intensity of light in each of the plurality of luminous elements. ### Claim 2 A light emitting device comprising: a plurality of luminous elements emitting different colors, respectively, each element including a first electrode, a second electrode transmitting light, a luminous layer disposed between the first electrode and the second electrode, and a reflective layer disposed between the first electrode and the second electrode; a protecting layer covering the plurality of luminous elements, placed on the second electrode of the luminous element; and a control layer placed on the second electrode of one luminous element or more in the plurality of luminous elements, wherein when an interval from an upper surface of an uppermost layer among layers placed on an upper surface of the second electrode to an upper surface of the reflective layer is defined as a first interval, an interval from a lower surface of the reflective layer to the upper surface of the uppermost layer is defined as a second interval, and an interval from an upper surface of the first electrode to the upper surface of the uppermost layer is defined as a third interval, the first through the third intervals include an region outside of the luminous element, and optical distances of the respective intervals are set such that both a traveling wave of light and a reflected wave of light traveling within at least the first interval in the first through third intervals enhance intensity of light in each of the plurality of luminous elements. ### Claim 3 (depends on 1) The light emitting device according to claim 1, wherein, when a luminous wavelength of the luminous element is defined as λ, a phase change of the light incident from a side of the uppermost layer to the upper surface of the second electrode and being reflected from the upper surface of the second electrode to the side of the uppermost layer is defined as φ1, the optical distance of the first interval is defined as L1, a phase change of the light incident from a side of the upper surface of the second electrode to the lower surface of the second electrode and being reflected from the lower surface of the second electrode to the side of the upper surface of the second electrode is defined as φ2, the optical distance of the second interval is defined as L2, a phase change of the light incident from a side of the luminous layer to the upper surface of the first electrode and being reflected from the upper surface of the first electrode to the side of the luminous layer is defined as φ3, and the optical distance of the third interval is defined as L3, there exists 0 or higher integers m satisfying one or more formulas in following formulas; |L1+(φ1/π−2m)λ/4|<λ/8(−π<φ1≦π) |L2+(φ2/π−2m)λ/4|<λ/8(−π<φ2≦π) |L3+(φ3/π−2m)λ/4|<λ/8(−π<φ3≦π). ### Claim 4 (depends on 2) The light emitting device according to claim 2, wherein, when a luminous wavelength of the luminous element is defined as λ, a phase change of the light incident from a side of the uppermost layer to the upper surface of the reflective layer and being reflected from the upper surface of the reflective layer to the side of the uppermost layer is defined as φ1, the optical distance of the first interval is defined as L1, a phase change of the light incident from a side of the second electrode to the lower surface of the reflective layer and being reflected from the lower surface of the reflective layer to the side of the second electrode is defined as φ2, the optical distance of the second interval is defined as L2, a phase change of the light incident from a side of the luminous layer to the upper surface of the first electrode and being reflected from the upper surface of the first electrode to the side of the luminous layer is defined as φ3, and the optical distance of the third interval is defined as L3, there exists 0 or higher integers m satisfying one or more formulas in following formulas; |L1+(φ1/π−2m)λ/4|<λ/8(−π<φ−1≦π) |L2+(φ2/π−2m)λ/4|<λ/8(−π<φ−2≦π) |L3+(φ3/π−2m)λ/4|<λ/8(−π<φ−3≦π). ### Claim 5 (depends on 1) The light emitting device according to claim 1, wherein the control layer has a smaller thickness than the protecting layer. ### Claim 6 (depends on 2) The light emitting device according to claim 2, wherein the control layer has a smaller thickness than the protecting layer. ### Claim 7 (depends on 1) The light emitting device according to claim 1, wherein the control layer is disposed nearer to the second electrode than the protecting layer. ### Claim 8 (depends on 2) The light emitting device according to claim 2, wherein the control layer is disposed nearer to the second electrode than the protecting layer. ### Claim 9 (depends on 1) The light emitting device according to claim 1, wherein the protecting layer is disposed nearer to the second electrode than the control layer. ### Claim 10 (depends on 2) The light emitting device according to claim 2, wherein the protecting layer is disposed nearer to the second electrode than the control layer. ### Claim 11 (depends on 1) The light emitting device according to claim 1, wherein a refractivity n1 of the control layer, and refractivities n2, n3 of respective layers disposed on both sides of the control layer have a relation of n3