# US 12,007,649 B2 · Vehicle quantum dot display system and method

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- Number: US 12,007,649 B2
- Document ID: US12007649B2
- Status: Granted
- Kind: B2
- Application number: 18/013,471
- Filed: 2020-06-30
- Published: 2023-08-31
- Granted: 2024-06-11
- Earliest claimed: 2020-06-30
- Assignees: Harman International Industries, Incorporated
- Applicants: Harman International Industries, Incorporated
- Inventors: Benjamin Edward Lewis
- Web page: https://patentgrep.com/patent/US12007649B2

## CPC

- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- 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 2202/36: Micro- or nanomaterials
- 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 vehicle display system may include a light guide, a quantum dot film arranged adjacent with the light guide and configured to receive blue light from the light guide and convert the blue light to red and green light, at least one buffer film, and a blue color filter arranged between the quantum dot film and the at least one buffer film, the blue color filter configured to transmit blue light back to the quantum dot film to further convert the red and green light.

## Claims

### Claim 1

A vehicle display system, comprising:
a light guide;
a quantum dot film arranged adjacent with the light guide and configured to receive blue light from the light guide and convert the blue light to red and green light;
at least one buffer film; and
a blue color filter arranged between the quantum dot film and the at least one buffer film, the blue color filter configured to transmit blue light back to the quantum dot film to further convert the red and green light.

### Claim 2 (depends on 1)

The system of claim 1, wherein the blue color filter is a blue reflective filter configured to reflect the blue light back to the quantum dot film.

### Claim 3 (depends on 1)

The system of claim 1, wherein the blue color filter causes additional unconverted red and green light to enter the light guide.

### Claim 4 (depends on 1)

The system of claim 1, wherein the light guide is configured to pass the additional red and green light to pan through the quantum dot film.

### Claim 5 (depends on 1)

The system of claim 1, further comprising at least on polarizer arranged adjacent the at least one buffer film.

### Claim 6 (depends on 1)

The system of claim 1, wherein the blue color filter is in direct contact with the quantum dot film.

### Claim 7 (depends on 1)

The system of claim 1, wherein the blue color filter is in direct contact with the at least one buffer film.

### Claim 8

A display system, comprising:
a light guide;
a quantum dot film arranged adjacent with the light guide and configured to receive blue light from the light guide and convert the blue light to red and green light; and
a blue color filter configured to transmit blue light back to the quantum dot film to convert the red and green light.

### Claim 9 (depends on 8)

The system of claim 8, further comprising at least one buffer film arranged between the quantum dot film and the blue color filter.

### Claim 10 (depends on 9)

The system of claim 9, wherein the blue color filter is arranged between the quantum dot film and the at least one buffer film.

### Claim 11 (depends on 9)

The system of claim 9, wherein the blue color filter is in direct contact with the at least one buffer film.

### Claim 12 (depends on 8)

The system of claim 8, wherein the blue color filter is a blue reflective filter configured to reflect the blue light back to the quantum dot film.

### Claim 13 (depends on 8)

The system of claim 8, wherein the blue color filter causes additional red and green light to enter the light guide.

### Claim 14 (depends on 8)

The system of claim 8, wherein the light guide is configured to present the additional red and green light to pass through the quantum dot film.

### Claim 15 (depends on 8)

The system of claim 8, further comprising at least on polarizer arranged adjacent the at least one buffer film.

### Claim 16 (depends on 8)

The system of claim 8, wherein the blue color filter is in direct contact with the quantum dot film.

### Claim 17

A method for providing vehicle display system, comprising:
providing a light guide;
positioning a quantum dot film adjacent to a light guide to receive blue light from the light guide;
converting the blue light to red and green light with the quantum dot film;
positioning a blue color filter arranged between at least one buffer film and the quantum dot film; and
transmitting the blue light back to the quantum dot film to convert the red and green light.

### Claim 18 (depends on 17)

The method of claim 17 further comprising positioning at least one buffer film between the quantum dot film and the blue color filter.

### Claim 19 (depends on 18)

The method of claim 18 further comprising positioning the blue color filter between the quantum dot film and the at least one buffer film.

### Claim 20 (depends on 18)

The method of claim 18, further comprising positioning the blue color filter in direct contact with the at least one buffer film.