# US 10,480,753 B2 · Illumination device and display device

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- Number: US 10,480,753 B2
- Document ID: US10480753B2
- Status: Granted
- Kind: B2
- Application number: 16/263,914
- Filed: 2019-01-31
- Published: 2019-05-30
- Granted: 2019-11-19
- Earliest claimed: 2012-11-09
- Assignees: Saturn Licensing LLC
- Applicants: Saturn Licensing LLC
- Inventors: Hirohisa Ishino
- Web page: https://patentgrep.com/patent/US10480753B2

## CPC

- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- G02B 6/0023: {provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source}
- G02B 6/0026: {Wavelength selective element, sheet or layer, e.g. filter or grating}
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- F21Y 2115/10: Light-emitting diodes [LED]
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

Provided is an illumination device that makes it possible to enhance utilization efficiency of light, and a display device that includes the illumination device. The illumination device includes: a light source that is configured to generate light of a first wavelength; a luminescent body that is configured to wavelength-convert the light of the first wavelength to light of a second wavelength, the second wavelength being different from the first wavelength; and a wavelength selective filter that is provided on a light-incident side of the luminescent body, the wavelength selective filter being configured to transmit the light of the first wavelength and to reflect the light of the second wavelength.

## Claims

### Claim 1

A display device comprising:
a light source configured to emit blue light;
a luminescent body comprising quantum dot material provided in a cured resin and positioned to receive the blue light, and configured to convert some of the blue light into each of green light and red light;
a wavelength selective filter provided outside the cured resin and positioned on one side of the luminescent body, the wavelength selection filter position to receive the green light and the red light, and configured to transmit the blue light and to reflect the green light and the red light; and
a display panel positioned on another side of the luminescent body,
wherein the luminescent body is configured such that a portion of the blue light entering the luminescent body transmits through the luminescent body without colliding with luminescent material that comprises the quantum dot material.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein
the luminescent body is in a container, and
the container includes, in an inside of the container, an accommodating section of the quantum dot material in the cured resin, and
a width of the wavelength selective filter is larger than a width of the accommodating section.

### Claim 3 (depends on 2)

The display device according to claim 2, wherein
the container has a shape of a cuboid, and is disposed with a surface of the cuboid facing the light source, and
the wavelength selective filter is provided at least on a surface that faces the light source of the container.

### Claim 4 (depends on 3)

The display device according to claim 3, wherein the surface that faces the light source of the container is curved convexly toward the light source.

### Claim 5 (depends on 3)

The display device according to claim 3, wherein the wavelength selective filter extends, beyond the surface that faces the light source of the container, on at least part of a surface adjacent to the surface that faces the light source of the container.

### Claim 6 (depends on 5)

The display device according to any one of claim 5, wherein the light guide plate has an end surface as a light-incident surface that faces the luminescent body.

### Claim 7 (depends on 6)

The display device according to claim 6, wherein a disposed region in which the luminescent body is disposed crosses a region through which the light that travels from the light source to the end surface passes.

### Claim 8

A display device comprising:
a light source configured to emit blue light;
a luminescent body comprising wavelength conversion material provided in a cured resin and positioned to receive the blue light, and configured to convert some of the blue light into each of green light and red light; and
a display panel positioned on another side of the luminescent body,
wherein the luminescent body is configured such that a portion of the blue light entering the luminescent body transmits through the luminescent body without colliding with the wavelength conversion material.

### Claim 9 (depends on 8)

The display device of claim 8 further comprising at least one light source substrate and comprises multiple light sources mounted on the light source substrate.

### Claim 10 (depends on 8)

The display device of claim 8, wherein the wavelength conversion material is quantum dot material.

### Claim 11 (depends on 8)

The display device of claim 8 further comprising:
a wavelength selective filter provided outside the cured resin and positioned on one side of the luminescent body, the wavelength selective filter positioned to receive the green light and the red light, and configured to transmit the blue light and to reflect the green light and the red light, wherein the wavelength conversion material is quantum dot material.

### Claim 12 (depends on 11)

The display device of claim 11 further comprising:
a light guide plate positioned to receive the receive the green light, red light, and unconverted blue light; and
a reflection member on a side of the light guide plate.

### Claim 13 (depends on 9)

The display device of claim 9 further comprising:
a wavelength selective filter provided outside the cured resin and positioned on one side of the luminescent body, the wavelength selective filter positioned to receive the green light and the red light, and configured to transmit the blue light and to reflect the green light and the red light.

### Claim 14 (depends on 13)

The display device according to claim 13 comprising an optical member, wherein the wavelength selective filter is between the optical member and the luminescent body.

### Claim 15 (depends on 9)

The display device according to claim 9, wherein
the luminescent body is in a container, and
the container is configured such that a portion of the blue light entering the container transmits through the container without colliding with the luminescent body.

### Claim 16 (depends on 15)

The display device according to claim 15, comprising a wavelength selective filter provided outside the luminescent body and positioned on one side of the luminescent body, the wavelength selection filter position to receive the green light and the red light, and configured to transmit the blue light and to reflect the green light and the red light.

### Claim 17 (depends on 16)

The display device according to claim 16, wherein the wavelength selective filter is provided on an outer surface on a light-incident side of the container.

### Claim 18

A display device comprising:
a light source configured to emit blue light;
a luminescent body comprising wavelength conversion material provided in a cured resin and positioned to receive the blue light, and configured to convert some of the blue light into each of green light and red light;
a wavelength selective filter provided outside the cured resin and positioned on one side of the luminescent body, the wavelength selection filter position to receive the green light and the red light, and configured to transmit the blue light and to reflect the green light and the red light; and
a display panel positioned on another side of the luminescent body,
wherein the luminescent body is configured such that a portion of the blue light entering the luminescent body transmits through the luminescent body without colliding with luminescent material that comprises the wavelength conversion material.