Transmittance-variable device

Patent metadata

Field	Value
Publication number	US-11630330-B2
Application number	US-201917270090-A
Country	US
Kind code	B2
Filing date	Sep 4, 2019
Priority date	Sep 4, 2018
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

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.

First claim

The invention claimed is:

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 an angle between a slow axis of the retardation film and an alignment direction of the liquid crystal alignment film is in a range of 8 degrees to 70 degrees, wherein the transmittance-variable layer is an active liquid crystal layer comprising a liquid crystal compound and a dichroic dye,
wherein the liquid crystal alignment film determines an initial orientation of the liquid crystal compound in the active liquid crystal layer.

2. 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.

3. The transmittance-variable device according to claim 1 , wherein the liquid crystal alignment film is formed on a surface of the retardation film.

4. The transmittance-variable device according to claim 1 , further comprising a substrate having a first surface 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.

5. The transmittance-variable device according to claim 1 , wherein the active liquid crystal layer is configured to form a horizontal orientation mode or an oblique orientation mode.

6. The transmittance-variable device according to claim 5 , wherein the horizontal orientation mode and the oblique orientation mode are twist modes.

7. The transmittance-variable device according to claim 1 , wherein the active crystal layer is 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.

8. 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.

9. The transmittance-variable device according to claim 1 , wherein the active liquid crystal layer further comprises a chiral agent.

10. The transmittance-variable device according to claim 1 , wherein the active liquid crystal layer has a thickness of 20 μm or less.

11. 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 .

12. The transmittance-variable device according to claim 1 , the retardation film has the in-plane retardation between 5000 nm and 50,000 nm.

13. The transmittance-variable device according to claim 1 , wherein the liquid crystal layer has a thickness between 0.01 um to 20 um.

Assignees

• Lg Chemical Ltd

Inventors

• Lim Eun Jung
• Belyaev Sergey
• Gim Min Jun
• Oh Dong Hyun
• You Jung Sun
• Kim Nam Gyu
• Kim Jin Hong
• Lee Hyun Jun

Classifications

• G02F1/1396

  the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell (G02F1/141 takes precedence) · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title

• G02F2413/08

  with a particular optical axis orientation · CPC title

• G02F1/13725

  based on guest-host interaction (G02F1/13762, G02F1/13737, take precedence) · CPC title

• G02B27/281 Primary

  used for attenuating light intensity, e.g. comprising rotatable polarising elements · CPC title