Light source for plant cultivation

Patent metadata

Field	Value
Publication number	US-11638400-B2
Application number	US-202217897925-A
Country	US
Kind code	B2
Filing date	Aug 29, 2022
Priority date	Aug 24, 2018
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

A plant cultivation light source includes a plurality of light sources configured to be turned on or turned off depending on a selected plant and a growth stage of the selected plant, and a controller. The controller is operable to turn on the light sources during a light period such that the light sources are operable to emit a light having a spectrum with a plurality of peaks to the selected plant. The light period including a first period and a second period and the first period preceding or following the second period. The controller is operable to adjust the spectrum of the light to alternate the first period and the second period during the light period.

First claim

What is claimed is:

1. A plant cultivation light source, comprising:
a light source module configured to emit a light to a plant, the light source module including:
a controller operable to turn on the light module during a light period,
a first light emitter having a first active layer emitting light having a first peak wavelength within a first color wavelength band range,
a second light emitter having a second active layer emitting light having a second peak wavelength within a second wavelength band range, and
a third light emitter having a third active layer emitting light having a third peak wavelength within a third color wavelength band range,

wherein the controller operates the first light emitter to emit light having a relatively high intensity,
wherein the controller operates the third light emitter to emit light having a lower intensity than the first peak wavelength,
wherein the light period comprises a first period and a second period, and
wherein the controller uses at most two of the first, second, and third light emitters for at least one growth stage of the plant during the second period.

2. The plant cultivation light source of claim 1 , wherein the controller controls the light module to emit light having a first spectral pattern in the first period that enables photosynthesis of the plant.

3. The plant cultivation light source of claim 1 , wherein the controller controls the light module to emit light having a second spectral pattern in the second period that increases a content of a predetermined substance in the plant.

4. The plant cultivation light source of claim 1 , wherein each light emitter further comprises a first semiconductor layer, a second semiconductor layer and a first and a second electrodes.

5. The plant cultivation light source of claim 4 , wherein the light source module further comprises a substrate having a printed circuit, wherein the printed circuit electrically connects to the light emitters through the first and the second electrodes.

6. The plant cultivation light source of claim 1 , wherein:
the first light emitter has a first energy band gap of the first active layer, and
the second light emitter has a second energy band gap of the second active layer,
wherein the first energy band gap has a longer peak wavelength than the second energy band gap.

7. The plant cultivation light source of claim 6 , wherein:
the third light emitter has a third energy band gap of the third active layer,
wherein the second energy band gap has a longer peak wavelength than the third energy band gap.

8. The plant cultivation light source of claim 1 , wherein the controller is further operable to alternate the first period and the second period during the light period.

9. The plant cultivation light source of claim 1 , wherein the controller further controls the light source module to continuously irradiate the light in the second period.

10. A plant cultivation light source, comprising:
a first light emitter having a first energy band gap of a first active layer,
a second light emitter having a second energy band gap of a second active layer, and
a third light emitter having a third energy band gap of a third active layer,
a controller operable to turn on one or more of the first, second, and third light emitters during a light period,
wherein the first energy band gap has longer peak wavelength than the second energy band gap,
wherein the second energy band gap has longer peak wavelength than the third energy band gap,
wherein the light period comprises a first period and a second period, and
wherein at least one of the first, second, third light emitter is off depending on a growth stage of the plant during the second period.

11. The plant cultivation light source of claim 10 , wherein the controller operates the light emitters to emit light having a first spectral pattern in the first period that enables photosynthesis of the plant.

12. The plant cultivation light source of claim 10 , wherein the controller operates the light emitters to emit light having a second spectral pattern in the second period that increases a content of a predetermined substance in the plant.

13. The plant cultivation light source of claim 10 , wherein each light emitter further comprises a first semiconductor layer, a second semiconductor layer and a first and a second electrodes.

14. The plant cultivation light source of claim 13 , further comprising a substrate having a printed circuit, wherein the printed circuit electrically connects to the light emitters through the first and the second electrodes.

15. The plant cultivation light source of claim 10 , wherein the controller is further operable to alternate the first period and the second period during the light period.

16. The plant cultivation light source of claim 10 , wherein the controller further controls the light emitters to continuously irradiate the light in the second period.

17. A plant cultivation device comprising:
a housing having an inner space capable of growing plants;
a light source disposed on the housing and configured to emit light into the inner space; and
a controller disposed on the housing and operable to turn on one or more emitters in the light source during a light period,
wherein the light source includes:
a first light emitter having a first active layer emitting light having a first peak wavelength within a first color wavelength band range,
a second light emitter having a second active layer emitting light having a second peak wavelength within a second wavelength band range, and
a third light emitter having a third active layer emitting light having a third peak wavelength within a third color wavelength band range,

wherein the first peak wavelength has a relatively high intensity,
wherein the third peak wavelength has a lower intensity than the first peak wavelength,
wherein the light period comprises a first period and a second period, and
wherein at least one of the first, second, and third light emitters is off for at least one growth stage of the plant during the second period.

18. The plant cultivation device of claim 17 , wherein:
the first light emitter has a first energy band gap of the first active layer, and
the second light emitter has a second energy band gap of the second active layer,
wherein the first energy band gap has a longer peak wavelength than the second energy band gap.

19. The plant cultivation device of claim 17 , further comprising a culture platform configured for placement in the inner space of the housing for cultivating the plants, wherein the culture platform includes a plate disposed at a position spaced apart upward from a bottom portion of the housing, wherein the plate includes a plurality of through-holes having a uniform size.

20. The plant cultivation device of claim 17 , further comprising at least one water supply unit to supply water to the plants.

Assignees

• Seoul Viosys Co Ltd

Inventors

• Kim Se Ryung
• Ko Sang Min
• Kim Jin Won
• Song Hyun Su

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/8252

  characterised by the dopants · CPC title

• H10H20/832

  characterised by their material · CPC title

• H10H20/831

  characterised by their shape · CPC title

• A01G9/249

  Lighting means (with special arrangements for promoting growth A01G7/045) · CPC title