# US 10,768,461 B2 · Light modulation device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,768,461 B2
- Document ID: US10768461B2
- Status: Granted
- Kind: B2
- Application number: 16/480,497
- Filed: 2018-04-30
- Published: 2019-12-19
- Granted: 2020-09-08
- Earliest claimed: 2017-04-28
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Hyun Jun Lee; Eun Jung Lim; Jung Sun You; Min Jun Gim; Dong Hyun Oh; Jin Hong Kim
- Web page: https://patentgrep.com/patent/US10768461B2

## CPC

- G02C 7/101: {having an electro-optical light valve (electro-optical elements per se G02F)}
- B32B 7/00: Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B 7/035: using arrangements of stretched films, e.g. of mono-axially stretched films arranged alternately
- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- G02B 27/01: Head-up displays
- G02F 1/0126: {Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass}
- G02F 1/133305: {Flexible substrates, e.g. plastics, organic film}
- G02F 1/13363: Birefringent elements, e.g. for optical compensation
- G02F 1/133631: {with a spatial distribution of the retardation value}
- G02F 1/134309: {characterised by their geometrical arrangement}
- G02F 1/13475: {in which at least one liquid crystal cell or layer is doped with a pleochroic dye, e.g. GH-LC cell (G02F1/13476 takes precedence)}
- G02F 1/13725: {based on guest-host interaction (G02F1/13762, G02F1/13737, take precedence)}
- G02F 1/13737: {in liquid crystals doped with a pleochroic dye}
- G02F 1/1396: {the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell (G02F1/141 takes precedence)}
- G02F 1/153: Constructional details
- G02B 27/0172: {characterised by optical features}
- G02B 27/0176: {characterised by mechanical features}
- G02B 2027/0178: {Eyeglass type (eyeglass details G02C)}
- G02C 2202/16: Laminated or compound lenses
- G02F 1/1326: {Liquid crystal optical waveguides or liquid crystal cells specially adapted for gating or modulating between optical waveguides}
- G02F 1/133365: {Cells in which the active layer comprises a liquid crystalline polymer}
- G02F 1/133528: {Polarisers}
- G02F 1/133536: {Reflective polarizers (G02F1/13362 takes precedence)}
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- G02F 1/133635: {Multifunctional compensators}
- G02F 1/13439: {characterised by their electrical, optical, physical properties; materials therefor; method of making}
- G02F 1/1347: Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
- G02F 2202/04: dye
- G02F 2413/01: Number of plates being 1
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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

## Abstract

The present application relates to a light modulation device and a use thereof. The present application can provide a light modulation device having both excellent mechanical properties and optical properties by applying a polymer film that is also optically anisotropic and mechanically anisotropic to a substrate.

## Claims

### Claim 1

A light modulation device comprising:
a first polymer film substrate and second polymer film substrate disposed opposite to each other, and
an active liquid crystal film layer having an active liquid crystal layer which is disposed between the first polymer film substrate and the second polymer film substrate,
wherein the active liquid crystal film layer contains a liquid crystal host and a dichroic dye guest,
wherein the active liquid crystal layer is configured to switch between a horizontal orientation state and a vertical orientation state,
each of the first polymer film substrate and the second polymer film substrate has an in-plane retardation of 4,000 nm or more for light having a wavelength of 550 nm,
each of the polymer film substrates has a ratio (E1/E2) of an elongation (E1) in a first direction to an elongation (E2) in a second direction perpendicular to the first direction of 3 or more, and
the first polymer film substrate and the second polymer film substrate are disposed so that an angle formed by the first direction of the first polymer film substrate and the first direction of the second polymer film substrate is in a range of 0 degrees to 10 degrees.

### Claim 2 (depends on 1)

The light modulation device according to claim 1, wherein each of the first polymer film substrate and second polymer film substrate is an electrode film substrate in which an electrode layer is formed on one side, and the first polymer film substrate and second polymer film substrate are disposed so that the electrode layers of the first polymer film substrate and the electrode layer of the second polymer film substrate face each other.

### Claim 3 (depends on 1)

The light modulation device according to claim 1, wherein the first polymer film substrate and second polymer film substrate are polyester film substrates.

### Claim 4 (depends on 1)

The light modulation device according to claim 1, wherein each of the first polymer film substrate and second polymer film substrate has the elongation (E1) in the first direction of 20% or more.

### Claim 5 (depends on 1)

The light modulation device according to claim 1, wherein each of the first polymer film substrate and second polymer film substrate has an elongation (E3) in a third direction, wherein an angle formed with both the first and second directions is in a range of 40 degrees to 50 degrees,
the elongation (E3) in a third direction is larger than the elongation (E1) in the first direction, and a ratio (E3/E2) of the elongation (E3) in the third direction to the elongation (E2) in the second direction is 5 or more.

### Claim 6 (depends on 1)

The light modulation device according to claim 1, wherein each of the first polymer film substrate and second polymer film substrate has a ratio (CTE2/CTE1) of a coefficient of thermal expansion (CTE2) in the second direction to a coefficient of thermal expansion (CTE1) in the first direction of 1.5 or more.

### Claim 7 (depends on 6)

The light modulation device according to claim 6, wherein the coefficient of thermal expansion (CTE2) in the second direction is in a range of 50 to 100 ppm/° C.

### Claim 8 (depends on 1)

The light modulation device according to claim 1, wherein each of the first polymer film substrate and second polymer film substrate has a ratio (YM1/YM2) of an elastic modulus (YM1) in the first direction to an elastic modulus (YM2) in the second direction of 1.5 or more.

### Claim 9 (depends on 8)

The light modulation device according to claim 8, wherein the elastic modulus (YM1) in the first direction is in a range of 2 to 10 GPa.

### Claim 10 (depends on 1)

The light modulation device according to claim 1, wherein each of the first polymer film substrate and second polymer film substrate has a ratio (MS1/MS2) of a maximum stress (MS1) in the first direction to a maximum stress (MS2) in the second direction of 1.5 or more.

### Claim 11 (depends on 10)

The light modulation device according to claim 10, wherein the maximum stress (MS1) in the first direction is in a range of 150 to 250 MPa.

### Claim 12 (depends on 1)

An eyewear comprising a left eye lens a right eye lens, and a frame for supporting the left eye lens and the right eye lens,
wherein the left eye lens and the right eye lens each comprise the light modulation device of claim 1.