# US 12,007,650 B2 · Low blue light displays

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- Number: US 12,007,650 B2
- Document ID: US12007650B2
- Status: Granted
- Kind: B2
- Application number: 17/385,058
- Filed: 2021-07-26
- Published: 2022-02-17
- Granted: 2024-06-11
- Earliest claimed: 2017-08-04
- Assignees: Korrus, Inc.
- Applicants: Korrus, Inc.
- Inventors: Aurelien J. F. David
- Web page: https://patentgrep.com/patent/US12007650B2

## CPC

- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- F21V 9/38: Combination of two or more photoluminescent elements of different materials
- G02B 5/201: {in the form of arrays}
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- H10W 90/00: Package configurations
- F21Y 2115/10: Light-emitting diodes [LED]
- F21Y 2115/15: Organic light-emitting diodes [OLED]
- F21Y 2115/30: Semiconductor lasers
- G02F 1/133514: {Colour filters}
- G02F 1/133624: {characterised by their spectral emissions}
- H10H 20/833: Transparent materials
- H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings
- H10H 20/851: Wavelength conversion means
- 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
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- 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
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A display for emitting display light comprising: (a) a light source for emitting a source light; and (b) a filter positioned in the path of said source light, said filter comprising at least short, medium and long filters, wherein said short filter is configured to transmit short-primary light from said source light, said short-primary light comprising a violet portion having wavelengths from 400 to 440 nm and at least a second portion having wavelengths above 440 nm such that said short-primary light is perceptually blue, said short-primary light having a short-primary SPD having a short-primary power between 380-780 nm and a blue power between 440-500 nm, wherein said blue power is less than 5% of said short-primary power.

## Claims

### Claim 1

A display having a low-blue display emission, said display comprising:
a plurality of pixels, each of said plurality of pixels comprising a plurality of subpixels, each of said plurality of subpixels comprising at least
a blue subpixel for emitting perceptively blue light having a first peak in in a range of 400 and 440 nm and a second peak in a range of 500 and 520 nm;
a green subpixel for emitting green light; and
a red subpixel for emitting red light.

### Claim 2 (depends on 1)

The display of claim 1, wherein said first peak is a range of 415 and 430 nm.

### Claim 3 (depends on 2)

The display of claim 2, further comprising:
a backlight; and
a plurality of filters overlaying said backlight, said plurality of filter corresponding to said plurality of subpixels, said plurality of filters comprises at least
a blue primary filter for emitting said perceptively blue light;
a green primary filter for emitting said green light; and
a red primary filter for emitting said red light.

### Claim 4 (depends on 3)

The display of claim 3, wherein said a blue primary filter comprises a violet filter and a cyan filter.

### Claim 5 (depends on 3)

The display of claim 3, wherein said green primary filter has a peak at 527 nm.

### Claim 6 (depends on 3)

The display of claim 3, wherein said red primary filter has a single peak at 638 nm.

### Claim 7 (depends on 2)

The display of claim 2, wherein each of said plurality of subpixels comprises at least
a blue primary emitter for emitting said perceptively blue light;
a green primary emitter for emitting said green light; and
a red primary emitter for emitting said red light.

### Claim 8 (depends on 7)

The display of claim 7, wherein said a blue primary emitter comprises a violet emitter and a cyan emitter.

### Claim 9 (depends on 7)

The display of claim 7, wherein said green primary emitter has a peak at 527 nm.

### Claim 10 (depends on 7)

The display of claim 7, wherein said red primary emitter has a single peak at 638 nm.

### Claim 11 (depends on 1)

The display of claim 1, wherein said red primary emitter has a single peak at 638 nm.

### Claim 12 (depends on 1)

The display of claim 1, further comprising a short wave filter with at least 50% transmittance between 400 and 520 nm.

### Claim 13 (depends on 1)

The display of claim 1, further comprising a short wave filter with at least 80% transmittance between 400 and 500 nm.