# US 10,863,678 B2 · Sunlight conversion device including wavelength conversion film comprising a control to adjust the wavelength outputted through a wavelength converting film

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- Number: US 10,863,678 B2
- Document ID: US10863678B2
- Status: Granted
- Kind: B2
- Application number: 16/282,353
- Filed: 2019-02-22
- Published: 2019-06-20
- Granted: 2020-12-15
- Earliest claimed: 2018-06-14
- Assignees: Sherpa Space Inc.
- Applicants: Sherpa Space Inc.
- Inventors: Choamun Yun; Wonjoon Choi
- Web page: https://patentgrep.com/patent/US10863678B2

## CPC

- A01G 7/045: {with electric lighting}
- A01G 9/243: {Collecting solar energy (in general F24S)}
- A01G 33/00: Cultivation of seaweed {or algae}
- H10F 77/1433: {Quantum dots}
- H10F 77/413: {directly associated or integrated with the devices, e.g. back reflectors (directly associated or integrated with photovoltaic cells H10F77/42)}
- H10F 77/45: Wavelength conversion means, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
- Y02A 40/25: Greenhouse technology, e.g. cooling systems therefor
- Y02B 10/10: Photovoltaic [PV]
- Y02E 10/52: PV systems with concentrators
- Y02P 60/12: using renewable energies, e.g. solar water pumping
- Y02P 60/14: Measures for saving energy, e.g. in green houses
- A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12)
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present disclosure relates to a sunlight converting device including a wavelength converting film using a wavelength conversion material such as a quantum dot or an inorganic phosphor. More particularly, the present disclosure provides a sunlight converting device including a wavelength converting film using a wavelength conversion material, which can optimize plant growth and provide improved plant quality by installing a wavelength converting film on which a wavelength conversion material is applied so as to be converted into a predetermined wavelength and output to a greenhouse, (glasshouse), a vinyl house or a microalga culture facility, varying the sunlight irradiation area of the wavelength converting film, and supplying light of various wavelengths required for species of plant including microalgae or growth cycles thereof.

## Claims

### Claim 1

A sunlight converting device comprising:
a wavelength converting unit including a wavelength converting film and configured to convert a wavelength of incident sunlight, the wavelength converting film coated with a wavelength conversion material for outputting light corresponding to a predetermined wavelength;
a driving unit configured to move the wavelength converting unit to thereby change a sunlight irradiated region of the wavelength converting film;
a control unit configured to control an operation of the driving unit to thereby adjust a wavelength outputted through the wavelength converting unit; and
an image acquiring unit configured to acquire a growth state image of a plant or microalgae cultivated in a facility and transmit the growth state image to the control unit.

### Claim 2 (depends on 1)

The sunlight converting device according to claim 1, wherein the wavelength converting unit is installed at an upper portion or a side portion of the facility.

### Claim 3 (depends on 1)

The sunlight converting device according to claim 1, wherein the wavelength converting film includes:
a polymer resin including divided regions and having a wavelength conversion material coated in each region thereof, the wavelength conversion material configured to convert sunlight into light of a predetermined wavelength and output the converted light;
a barrier film laminated on both surfaces of the polymer resin for preventing deterioration of the wavelength conversion material; and
a composite material formed on at least one surface of the barrier film to provide a supporting force.

### Claim 4 (depends on 1)

The sunlight converting device according to claim 1, further comprising:
a sensor unit configured to sense a state and a wavelength of the sunlight,
wherein the control unit controls the driving unit to adjust the sunlight irradiated region of the wavelength converting unit depending on a state of the sunlight varying according to a day, time, a location, and weather, based on the state and the wavelength of the sunlight transmitted from the sensor unit.

### Claim 5 (depends on 1)

The sunlight converting device according to claim 1, wherein the wavelength converting unit has the wavelength converting film wound around two rollers provided on both sides thereof, and the sunlight-irradiated region of the wavelength converting film is changed as the driving unit winds or unwinds the two rollers.

### Claim 6 (depends on 1)

The sunlight converting device according to claim 1, wherein the wavelength converting unit has the wavelength converting film provided in a form of a foldable curtain, and the sunlight-irradiated region is changed as the driving unit folds or unfolds the wavelength converting film.

### Claim 7 (depends on 1)

The sunlight converting device according to claim 1, wherein the wavelength converting unit has the wavelength converting film provided in multiple layers, and the sunlight-irradiated region is changed as the driving unit changes a position of each layer of the wavelength converting film composed of the multiple layers.

### Claim 8 (depends on 1)

The sunlight converting device according to claim 1,
wherein the wavelength converting film includes a plurality of separated regions, and
wherein the separated regions include:
a first region including a wavelength conversion material emitting a red color;
a second region including a wavelength conversion material emitting a green color;
a third region including a wavelength conversion material emitting a blue color;
a fourth region including a wavelength conversion material emitting an arbitrary color obtained by mixing together two or more of the wavelength converting materials emitting the red color, the green color, and the blue color;
a fifth region formed by stacking two or more of the wavelength converting materials emitting the red color, the green color, the blue color, and the arbitrary color;
a sixth region configured to allow the sunlight to be outputted as is; and
a seventh region configured to block the sunlight.

### Claim 9 (depends on 1)

The sunlight converting device according to claim 1, wherein the control unit controls the driving unit to adjust the sunlight-irradiated region of the wavelength converting unit by analyzing the growth state image of the plant or microalgae cultivated in the facility acquired by the image acquiring unit to analyze a required wavelength matching a growth phase of the plant or microalgae cultivated in the facility from a growth model DB (database) and controlling the driving unit such that the required wavelength is outputted.

### Claim 10 (depends on 1)

The sunlight converting device according to claim 1, wherein the wavelength conversion material comprises either quantum dots or inorganic phosphors.