Light Emitting Device and Projector
US-2020279974-A1 · Sep 3, 2020 · US
Light emitting device, projector, and display
US12224556B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12224556-B2 |
| Application number | US-202217693394-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 13, 2022 |
| Priority date | Mar 15, 2021 |
| Publication date | Feb 11, 2025 |
| Grant date | Feb 11, 2025 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The light emitting device includes a substrate, and a laminated structure including columnar parts, wherein the columnar parts include a first semiconductor layer of a first conductivity type, a second semiconductor layer of a second conductivity type, and a light emitting layer disposed between the first semiconductor layer and the second semiconductor layer, the light emitting layer has a c-plane and a facet plane, the second semiconductor layer is disposed on the c-plane and the facet plane, the first semiconductor layer has a first portion and a second portion smaller in diametrical size than the first portion, the second portion is disposed between the substrate and the first portion, and the c-plane and the second portion overlap each other, and the c-plane is smaller in diametrical size than the second portion in a plan view from a stacking direction of the first semiconductor layer and the light emitting layer.
First claim
Opening claim text (preview).
What is claimed is: 1. A light emitting device comprising: a substrate; and a laminated structure including a plurality of columnar parts, wherein the columnar part includes a first semiconductor layer of a first conductivity type, a second semiconductor layer of a second conductivity type different from the first conductivity type, and a light emitting layer disposed between the first semiconductor layer and the second semiconductor layer, the first semiconductor layer is disposed between the substrate and the light emitting layer, the light emitting layer has a c-plane and a facet plane, the second semiconductor layer is disposed on the c-plane and the facet plane, the first semiconductor layer has a first portion and a second portion smaller in diametrical size than the first portion, the second portion is disposed between the substrate and the first portion, and the c-plane and the second portion overlap each other, and the c-plane is smaller in diametrical size than the second portion in a plan view from a stacking direction of the first semiconductor layer and the light emitting layer. 2. The light emitting device according to claim 1 , wherein the light emitting layer is larger in diametrical size than the c-plane and the second portion. 3. The light emitting device according to claim 1 , wherein a step is formed at a boundary between the first portion and the second portion. 4. The light emitting device according to claim 1 , wherein the substrate is provided with an insulating layer having an opening part, and the second portion is disposed in the opening part. 5. The light emitting device according to claim 4 , wherein the insulating layer is disposed between the substrate and the first portion. 6. The light emitting device according to claim 1 , wherein in the plan view, a portion of the second semiconductor layer overlapping the c-plane is higher in impurity concentration than a portion of the second semiconductor layer overlapping the facet plane. 7. A projector comprising: the light emitting device according to claim 1 . 8. A display comprising: the light emitting device according to claim 1 .
Assignees
Inventors
Classifications
LED or laser light sources · CPC title
characterised by their shape, e.g. curved or truncated substrates · CPC title
Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title
having specific optical properties, e.g. transparent electrodes · CPC title
having only horizontal cavities, e.g. horizontal cavity surface-emitting lasers [HCSEL] (comprising a photonic bandgap structure H01S5/11) · CPC title
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Frequently asked questions
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- What does patent US12224556B2 cover?
- The light emitting device includes a substrate, and a laminated structure including columnar parts, wherein the columnar parts include a first semiconductor layer of a first conductivity type, a second semiconductor layer of a second conductivity type, and a light emitting layer disposed between the first semiconductor layer and the second semiconductor layer, the light emitting layer has a c-p…
- Who is the assignee on this patent?
- Seiko Epson Corp, Sophia School Corp
- What technology area does this patent fall under?
- Primary CPC classification H01S5/11. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 11 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 12 related publications on this page (citations in our corpus or others sharing the same primary CPC).