# US 11,275,265 B2 · Control of illumination spectra for LCD displays

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- Number: US 11,275,265 B2
- Document ID: US11275265B2
- Status: Granted
- Kind: B2
- Application number: 15/691,775
- Filed: 2017-08-31
- Published: 2018-02-08
- Granted: 2022-03-15
- Earliest claimed: 2015-11-16
- Assignees: Moleculed Ltd.
- Applicants: StoreDot Ltd.
- Inventors: Daniel Szwarcman; Ziv Sobol
- Web page: https://patentgrep.com/patent/US11275265B2

## CPC

- G02F 1/133514: {Colour filters}
- C08G 83/001: {Macromolecular compounds containing organic and inorganic sequences, e.g. organic polymers grafted onto silica}
- C09B 11/12: without any OH group bound to an aryl nucleus
- C09B 11/24: Phthaleins containing amino groups {; Phthalanes; Fluoranes; Phthalides; Rhodamine dyes; Phthaleins having heterocyclic aryl rings; Lactone or lactame forms of triarylmethane dyes}
- C09B 62/465: the reactive group being an acryloyl group, a quaternised or non-quaternised aminoalkyl carbonyl group or a (—N)n—CO—A—O—X or (—N)n—CO—A—Hal group, wherein A is an alkylene or alkylidene group, X is hydrogen or an acyl radical of an organic or inorganic acid, Hal is a halogen atom, and n is 0 or 1
- C09B 67/0083: {Solutions of dyes}
- C09B 69/008: {Dyes containing a substituent, which contains a silicium atom}
- C09B 69/103: {containing a diaryl- or triarylmethane dye}
- C09K 11/025: {non-luminescent particle coatings or suspension media}
- C09K 11/06: containing organic luminescent materials
- G02F 1/133516: {Methods for their manufacture, e.g. printing, electro-deposition or photolithography}
- G02F 1/133528: {Polarisers}
- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- G02F 1/133621: {providing coloured light (G02F1/133617, G02F1/133533 take precedence)}
- G03F 7/0007: {Filters, e.g. additive colour filters; Components for display devices}
- G03F 7/105: having substances, e.g. indicators, for forming visible images
- C09K 2211/1007: Non-condensed systems
- C09K 2211/1011: Condensed systems
- C09K 2211/1018: Heterocyclic compounds
- C09K 2211/1048: with oxygen
- C09K 2211/1088: containing oxygen as the only heteroatom
- C09K 2323/00: Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K 2323/03: Viewing layer characterised by chemical composition
- 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
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G)

## Abstract

Color conversion films for a LCD (liquid crystal display) having RGB (red, green, blue) color filters, as well as such displays, formulations, precursors and methods are provided, which improve display performances with respect to color gamut, energy efficiency, materials and costs. The color conversion films absorb backlight illumination and convert the energy to green and/or red emission at high efficiency, specified wavelength ranges and narrow emission peaks. Film integration and display configurations further enhance the display performance with color conversion films utilizing various color conversion elements and possibly patterned and/or integrated with a crosstalk blocking matrix. For example, color conversion and/or assistant dyes may be used to enhance spectral regions transmitted through the color filters and shape the illumination spectrum, to improve efficiency and performance.

## Claims

### Claim 1

An LCD (liquid crystal display) comprising:
a backlight unit configured to provide illumination, and
an LCD panel configured to receive illumination from the backlight unit and comprising, sequentially with respect to the received illumination: a polarizing film, a liquid crystal layer, an analyzer film, an RGB (red, green, blue) color filter layer which is integrated with a color conversion film that is folded into a zig-zag shape, and a protective layer, the RGB color filter layer comprises RBG filters, wherein in respect to the received illumination—the RGB filters follows the color conversion film; wherein each of the RGB color filters is configured to (a) pass a RGB light component and (b) to remove two other RGB light components;
wherein the color conversion film comprises rhodamine-based fluorescent (RBF) compounds selected to (a) absorb illumination from the backlight unit, (b) perform color conversion and (c) emit emitted radiation, wherein the RBF compounds have at least one of a Red emission peak and a Green emission peak;
wherein the color conversion film is positioned between a first optical element that comprises a dual brightness enhancement film (DBEF) film which is transparent to blue light and reflective to red and green light, and a second optical element that comprises another DBEF film that is transparent to the blue light and reflective to the red and green light.

### Claim 2

An LCD (liquid crystal display) comprising:
a backlight unit configured to provide illumination, and
an LCD panel configured to receive illumination from the backlight unit and comprising, sequentially with respect to the received illumination: a polarizing film, a liquid crystal layer, an analyzer film, an RGB (red, green, blue) color filter layer which is integrated with a color conversion film that is folded into a zig-zag shape, and a protective layer, the RGB color filter layer comprises RGB color filters, wherein in respect to the received illumination—the RGB filters follows the color conversion layer, wherein each of the RGB color filters is configured to (a) pass a RGB light component and (b) to remove two other RGB light components;
wherein the color conversion film further comprises at least one fluorescent compound selected to have, when embedded in the color conversion film, an absorption peak outside a respective transmission region of one of the RGB filters and a fluorescence peak inside the respective transmission region of a RGB filter of the RGB filters,
wherein the color conversion film comprises rhodamine-based fluorescent (RBF) compounds selected to (a) absorb illumination from the backlight unit, (b) perform color conversion and (c) emit emitted radiation, wherein the RBF compounds have at least one of a Red emission peak and a Green emission peak; and
wherein the color conversion film is positioned between a first optical element that comprises a dual brightness enhancement film (DBEF) film which is transparent to blue light and reflective to red and green light, and a second optical element that comprises another DBEF film that is transparent to the blue light and reflective to the red and green light.

### Claim 3

An LCD (liquid crystal display) comprising:
a backlight unit configured to provide illumination, and
an LCD panel configured to receive illumination from the backlight unit and comprising, sequentially with respect to the received illumination: a polarizing film, a liquid crystal layer, an analyzer film, an RGB (red, green, blue) color filter layer which is integrated with a color conversion film, and a protective layer, the RGB color filter layer comprises RGB color filters, wherein in respect to the received illumination—the RGB filters follows the color conversion layer, wherein each of the RGB color filters is configured to (a) pass a RGB light component and (b) to remove two other RGB light components;
wherein the color conversion film is positioned between a first optical element that comprises a dual brightness enhancement film (DBEF) film which is transparent to blue light and reflective to red and green light, and a second optical element that comprises another DBEF film that is transparent to the blue light and reflective to the red and green light;
wherein the color conversion film further comprises at least one fluorescent compound selected to have, when embedded in the color conversion film, an absorption peak outside a respective transmission region of one of the RGB filters and a fluorescence peak inside the respective transmission region of a RGB filter of the RGB filters; and
wherein the color conversion film comprises rhodamine-based fluorescent (RBF) compounds selected to (a) absorb illumination from the backlight unit, (b) perform color conversion and (c) emit emitted radiation, wherein the RBF compounds have at least one of a Red emission peak and a Green emission peak.