# US 10,120,114 B2 · Light conversion member, and backlight unit and display device including the same

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- Number: US 10,120,114 B2
- Document ID: US10120114B2
- Status: Granted
- Kind: B2
- Application number: 14/734,756
- Filed: 2015-06-09
- Published: 2016-08-04
- Granted: 2018-11-06
- Earliest claimed: 2015-02-04
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seongman Jeon; Jinmok Oh; Moongoo Choi; Hyunkwon Shin; Jinwoo Sung
- Web page: https://patentgrep.com/patent/US10120114B2

## CPC

- G02B 6/0003: {the light guides being doped with fluorescent agents}
- G02B 6/0011: {the light guides being planar or of plate-like form}
- G02F 1/133609: {including means for improving the color mixing, e.g. white}
- G02F 2/02: Frequency-changing of light, e.g. by quantum counters
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources}
- G02B 6/0073: {Light emitting diode [LED]}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- G02F 1/133624: {characterised by their spectral emissions}
- G02F 2203/055: wavelength filtering
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

A light conversion member having excellent reliability and white balance characteristics, and a backlight unit and a display device including the same are provided. The light conversion member according to the present disclosure includes at least one light conversion layer including quantum dots and at least one band-pass filter which reduces transmittance of light having a wavelength band of 480 nm or more.

## Claims

### Claim 1

A light conversion member, comprising:
a light conversion layer comprising red light-emitting quantum dots that convert a blue light having a blue light wavelength band into a red light having a red light wavelength band, and green light-emitting quantum dots that convert the blue light into a green light having a green light wavelength band, the red light-emitting quantum dots and the green light-emitting quantum dots having a sphere shape;
a first band-pass filter surrounding a circumference of a corresponding red light-emitting quantum dot and having light transmittance of the red light of 85% to 95%; and
a second band-pass filter surrounding a circumference of a corresponding green light-emitting quantum dot and having light transmittance of the green light of 85% to 95%.

### Claim 2 (depends on 1)

A backlight unit, comprising:
a light source unit comprising a plurality of light sources; and
the light conversion member according to claim 1.

### Claim 3 (depends on 2)

The backlight unit according to claim 2, wherein the light source unit comprises a blue light-emitting diode.

### Claim 4 (depends on 1)

A display device, comprising:
a backlight unit which comprises a light source unit comprising a plurality of light sources, and the light conversion member according to claim 1; and
a display panel which is disposed on the backlight unit.