# US 2021/0240012 A1 · Transmittance-Variable Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0240012 A1 - Document ID: US20210240012A1 - Status: Published application - Kind: A1 - Application number: 17/270,090 - Filed: 2019-09-04 - Published: 2021-08-05 - Earliest claimed: 2018-09-04 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Eun Jung Lim; Sergey Belyaev; Min Jun Gim; Dong Hyun Oh; Jung Sun You; Nam Gyu Kim; Jin Hong Kim; Hyun Jun Lee - Web page: https://patentgrep.com/patent/US20210240012A1 ## CPC - G02B 27/281: {used for attenuating light intensity, e.g. comprising rotatable polarising elements} - G02C 7/101: {having an electro-optical light valve (electro-optical elements per se G02F)} - G02F 1/13363: Birefringent elements, e.g. for optical compensation - G02F 1/133636: {with twisted orientation, e.g. comprising helically oriented LC-molecules or a plurality of twisted birefringent sublayers} - G02F 1/133638: {Waveplates, i.e. plates with a retardation value of lambda/n} - G02F 1/1337: Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers - G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid} - G02B 27/0172: {characterised by optical features} - G02F 1/133784: {by rubbing} - G02F 1/13725: {based on guest-host interaction (G02F1/13762, G02F1/13737, take precedence)} - 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 2202/04: dye - G02F 2202/40: Materials having a particular birefringence, retardation - G02F 2413/08: with a particular optical axis orientation - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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) - 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 A transmittance-variable device is provided in the present application. The present application provides a transmittance-variable device, which can be applied to various applications without causing problems such as a crosstalk phenomenon, a rainbow phenomenon or a mirroring phenomenon, while having excellent transmittance-variable characteristics. ## Claims ### Claim 1 A transmittance-variable device, comprising: a retardation film having in-plane retardation of 5,000 nm or more for light having a wavelength of 550 nm; a liquid crystal alignment film; and a transmittance-variable layer configured to generate a polarization component, wherein the retardation film, the liquid crystal alignment film and the transmittance-variable layer are comprised in the above order, and wherein a smallest angle among angles between a slow axis of the retardation film and an alignment direction of the liquid crystal alignment film is in a range of 0 degrees to 70 degrees. ### Claim 2 (depends on 1) The transmittance-variable device according to claim 1, wherein a ratio (Tmax/Tmin) of a maximum transmittance (Tmax) to a minimum transmittance (Tmin) is in a range from 1.5 to 10. ### Claim 3 (depends on 1) The transmittance-variable device according to claim 1, wherein the liquid crystal alignment film is formed on a surface of the retardation film. ### Claim 4 (depends on 1) The transmittance-variable device according to claim 1, further comprising a substrate on having a first surface of on which the liquid crystal alignment film is formed, wherein the retardation film is attached to a second surface of the substrate on which the liquid crystal alignment film is not formed. ### Claim 5 (depends on 1) The transmittance-variable device according to claim 1, wherein the transmittance-variable layer is a liquid crystal layer configured to form a horizontal orientation mode or an oblique orientation mode. ### Claim 6 (depends on 5) The transmittance-variable device according to claim 5, wherein the horizontal orientation mode and the oblique orientation mode are twist modes. ### Claim 7 (depends on 1) The transmittance-variable device according to claim 1, wherein the transmittance-variable layer is a liquid crystal layer configured to implement a twist orientation mode, and wherein an angle between the slow axis of the retardation film and the alignment direction of the liquid crystal alignment film measured along a twisting direction of the twist orientation mode is in a range from 0 degrees to 70 degrees. ### Claim 8 (depends on 7) The transmittance-variable device according to claim 7, wherein the twist orientation mode is a horizontal twist orientation mode or an oblique twist orientation mode. ### Claim 9 (depends on 5) The transmittance-variable device according to claim 5, wherein the liquid crystal layer comprises a dichroic dye. ### Claim 10 (depends on 7) The transmittance-variable device according to claim 7, wherein the liquid crystal layer comprises a chiral agent. ### Claim 11 (depends on 1) The transmittance-variable device according to claim 1, wherein the liquid crystal layer has a thickness of 20 μm or less. ### Claim 12 (depends on 1) An eyewear, comprising: a left eye lens and a right eye lens; and a frame configured to support the left eye lens and the right eye lens, wherein each of the left eye lens and the right eye lens comprises the transmittance-variable device of claim 1. ### Claim 13 (depends on 7) The transmittance-variable device according to claim 7, wherein the liquid crystal layer comprises a dichroic dye. ### Claim 14 (depends on 1) The transmittance-variable device according to claim 1, the retardation film has the in-plane retardation between 5000 nm and 50,000 nm. ### Claim 15 (depends on 1) The transmittance-variable device according to claim 1, wherein the liquid crystal layer has a thickness between 0.01 um to 20 um.