# US 11,112,653 B2 · Wide color-gamut vehicle infotainment display system with quantum dot element

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- Number: US 11,112,653 B2
- Document ID: US11112653B2
- Status: Granted
- Kind: B2
- Application number: 15/836,752
- Filed: 2017-12-08
- Published: 2018-04-12
- Granted: 2021-09-07
- Earliest claimed: 2015-05-29
- Assignees: Harman International Industries, Incorporated
- Applicants: Harman International Industries, Incorporated
- Inventors: Rashmi Rao; Elijah Auger
- Web page: https://patentgrep.com/patent/US11112653B2

## CPC

- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces}
- 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}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- G02F 2202/108: quantum wells
- 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

## Abstract

A display device includes a planar array of blue light-emitting diodes (LEDs) that are each configured to generate a blue output light, wherein the planar array is positioned parallel to a light-receiving surface of a liquid crystal module and a nanocrystal material that is disposed between the planar array and the liquid crystal module, and the liquid crystal module. The nanocrystal material is configured to: receive the blue output light, convert a first portion of the blue output light to a green light emission, convert a second portion of the blue output light to a red light emission, and transmit a remainder portion of the blue output light. The liquid crystal module is configured to generate an image that includes a portion of the green light emission, a portion of the red light emission, and a portion of the remainder portion of the blue output light.

## Claims

### Claim 1

A display device, comprising:
an array of blue light-emitting diodes (LEDs) that are each configured to generate a blue output light;
a nanocrystal material that is disposed at a first position along a path of light from the array of blue LEDs to a liquid crystal module, the nanocrystal material configured to receive the blue output light,
wherein at least a first portion of the nanocrystal material is configured based on one of a first shape and converts a first portion of the blue output light to a green light emission having a first peak wavelength,
wherein at least a second portion of the nanocrystal material is configured based on a second shape and converts a second portion of the blue output light to a red light emission having a second peak wavelength, wherein the second shape is different from the first shape, and
wherein at least a third portion of the nanocrystal material is configured to transmit a remainder portion of the blue output light;
a color filter assembly disposed at a second position along the path of light, wherein the second position is located along a path from the first position to the liquid crystal module, wherein the color filter assembly is configured with a first passband that is configured to match the first peak wavelength, a second passband that is configured to match the second peak wavelength, and a third passband that includes a peak wavelength of the remainder portion of the blue output light; and
the liquid crystal module, which is configured to receive the green light emission passed through the color filter assembly, the red light emission passed through the color filter assembly, and the remainder portion of the blue output light passed through the color filter assembly and generate an image that includes a portion of the green light emission, a portion of the red light emission, and a portion of the remainder portion of the blue output light,
wherein the first position at which the nanocrystal material is disposed comprises an outer surface of at least one blue LED included in the array of blue LEDs and forms an outermost surface of an LED assembly in which the at least one blue LED is disposed.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the blue output light is emitted toward a light-receiving surface of the liquid crystal module.

### Claim 3 (depends on 1)

The display device of claim 1, wherein each blue LED included in the array of blue LEDs is mounted on a first printed circuit board.

### Claim 4 (depends on 1)

The display device of claim 1, wherein the nanocrystal material is disposed on an outer surface of the array.

### Claim 5 (depends on 1)

The display device of claim 1, wherein the nanocrystal material is formed as a continuous film that is disposed at the first position.

### Claim 6 (depends on 1)

The display device of claim 1, wherein the first position at which the nanocrystal material is disposed comprises a light-emitting surface of each of the blue LEDs.

### Claim 7

A vehicle infotainment system, comprising:
a processor configured to generate digital images; and
a display device for displaying the digital images that includes:
an array of multiple blue light-emitting diodes (LEDs) that are each configured to generate a blue output light;
a nanocrystal material that is disposed at a first position along a path of light from the array of blue LEDs to a liquid crystal module, the nanocrystal material configured to receive the blue output light,
wherein at least a first portion of the nanocrystal material is configured based on a first shape and converts a first portion of the blue output light to a green light emission having a first peak wavelength,
wherein at least a second portion of the nanocrystal material is configured based on a second shape and converts a second portion of the blue output light to a red light emission having a second peak wavelength, wherein the second shape is different from the first shape, and
wherein at least a third portion of the nanocrystal material is configured to transmit a remainder portion of the blue output light;
a color filter assembly disposed at a second position along the path of light, wherein the second position is located along a path from the first position to the liquid crystal module, wherein the color filter assembly is configured with a first passband that is configured to match the first peak wavelength, a second passband that is configured to match the second peak wavelength, and a third passband that includes a peak wavelength of the remainder portion of the blue output light; and
the liquid crystal module configured to receive the green light emission passed through the color filter assembly, the red light emission passed through the color filter assembly, and the remainder portion of the blue output light passed through the color filter assembly and generate an image that includes a portion of the green light emission, a portion of the red light emission, and a portion of the remainder portion of the blue output light,
wherein the first position at which the nanocrystal material is disposed comprises an outer surface of at least one blue LED included in the array of blue LEDs and forms an outermost surface of an LED assembly in which the at least one blue LED is disposed.

### Claim 8 (depends on 7)

The display device of claim 7, wherein the nanocrystal material is disposed on an outer surface of the array.

### Claim 9 (depends on 7)

The display device of claim 7, wherein the nanocrystal material is formed as a continuous film that is disposed at the first position.

### Claim 10 (depends on 7)

The display device of claim 7, wherein the first position at which the nanocrystal material is disposed comprises a light-emitting surface of each of the blue LEDs.

### Claim 11 (depends on 7)

The display device of claim 7, wherein the nanocrystal material includes at least one of quantum dots or quantum rods.

### Claim 12 (depends on 7)

The display device of claim 7, wherein in combination, the red light emission, the green light emission, and the remainder portion of the blue output light produce a white light substantially equivalent to International Commission on Illumination (CIE) Standard Illuminant D65.

### Claim 13

A display device, comprising:
an array of blue light-emitting diodes (LEDs) that are each configured to generate a blue output light;
a nanocrystal material that is disposed at a first position along a path of light from the array of blue LEDs to a liquid crystal module, the nanocrystal material configured to receive the blue output light,
wherein at least a first portion of the nanocrystal material is configured based on a first shape and converts a first portion of the blue output light to a green light emission having a first peak wavelength,
wherein at least a second portion of the nanocrystal material is configured based on a second shape and converts a second portion of the blue output light to a red light emission having a second peak wavelength, wherein the second shape is different from the first shape, and
wherein at least a third portion of the nanocrystal material is configured to transmit a remainder portion of the blue output light;
a color filter assembly disposed at a second position along the path of light, wherein the second position is located along a path from the first position to the liquid crystal module, wherein the color filter assembly is configured with a first passband that is configured to match the first peak wavelength, a second passband that is configured to match the second peak wavelength, and a third passband that includes a peak wavelength of the remainder portion of the blue output light; and
the liquid crystal module, which is configured to receive the green light emission passed through the color filter assembly, the red light emission passed through the color filter assembly, and the remainder portion of the blue output light passed through the color filter assembly and generate an image that includes a portion of the green light emission, a portion of the red light emission, and a portion of the remainder portion of the blue output light,
wherein the first position at which the nanocrystal material is disposed comprises an outer surface of at least one blue LED included in the array of blue LEDs and forms an outermost surface of an LED assembly in which the at least one blue LED is disposed.