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US 2026/0299364 A1Published application
Light control sheet, light control device, and method for producing light control sheet
AssigneeToppan Holdings Inc.
InventorTetsushi YOSHIDA
Life of this patent
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Abstract
A liquid crystal composition includes a liquid crystal compound and at least one dichroic dye. The liquid crystal compound accounts for 45% by mass or more of the sum of the mass of a transparent polymer layer and the mass of the liquid crystal composition. A light control sheet exhibiting a second state has a total light transmittance T of 10% or more and 80% or less. The anisotropy value Rm of the dichroic dye is 0.25 or higher and 0.94 or lower, and satisfies equation (1). In equation (1), ln denotes a natural logarithm. Anisotropy value Rm≥0.3434 ln(T)−0.4297 . . . Equation (1).
Claims12
A light control sheet comprising:
- a first transparent electrode layer;
- a second transparent electrode layer;
- and
- a light control layer interposed between the first transparent electrode layer and the second transparent electrode layer, the light control layer including a transparent polymer layer containing a plurality of voids and a liquid crystal composition occupying the plurality of voids,
- wherein the light control sheet exhibits a first state and a second state having a lower haze value than the first state, depending on a magnitude of a voltage applied to the light control layer,
- the liquid crystal composition contains a liquid crystal compound and at least one dichroic dye,
- the liquid crystal compound comprises 45% by mass or more of a sum of mass of the transparent polymer layer and mass of the liquid crystal composition,
- the light control sheet exhibiting the second state has a total light transmittance T of 10% or more and 80% or less, and
- the dichroic dye has an anisotropy value Rm of 0.25 or higher and 0.94 or lower, the anisotropy value Rm satisfying equation (1):
- Anisotrophy
-
- value
-
- Rm
- ≥
- 0
- .
- 3
-
- 434
-
- ln
-
- (
- T
- )
- -
- 0.4297
- Equation
-
- (
- 1
- )
- where ln denotes a natural logarithm.
31 more elements
A light control sheet comprising:
- a first transparent electrode layer;
- a second transparent electrode layer;
- and
- a light control layer interposed between the first transparent electrode layer and the second transparent electrode layer, the light control layer including a transparent polymer layer containing a plurality of voids and a liquid crystal composition occupying the plurality of voids,
- wherein the light control sheet exhibits a first state and a second state having a lower haze value than the first state, depending on a magnitude of a voltage applied to the light control layer,
- the liquid crystal composition contains a liquid crystal compound and at least one dichroic dye,
- the liquid crystal compound comprises 55% by mass or more of a sum of mass of the transparent polymer layer and mass of the liquid crystal composition,
- the light control sheet exhibiting the second state has a total light transmittance T of 10% or more and 80% or less, and
- the dichroic dye has an anisotropy value Rm of 0.25 or higher and 0.94 or lower, the anisotropy value Rm satisfying equation (2):
- Anisotrophy
-
- value
-
- Rm
- ≥
- 0.2989
- ln
-
- (
- T
- )
- -
- 0
- .
- 3
-
- 472
- Equation
-
- (
- 2
- )
- where ln denotes a natural logarithm.
30 more elements
A method for producing a light control sheet including
- a first transparent electrode layer,
- a second transparent electrode layer, and
- a light control layer interposed between the first transparent electrode layer and the second transparent electrode layer, the light control layer including a transparent polymer layer containing a plurality of voids and a liquid crystal composition occupying the plurality of voids, the light control sheet being configured to exhibit a first state and a second state having a lower haze value than the first state, depending on a magnitude of a voltage applied to the light control layer, the method comprising:
- formulating a coating solution containing a liquid crystal compound, a dichroic dye, and a polymerizable composition;
- forming a coating film between the first transparent electrode layer and the second transparent electrode layer with the coating solution;
- and
- polymerizing the polymerizable composition in the coating film,
- wherein formulating the coating solution includes
- formulating the coating solution such that the liquid crystal compound accounts for 45% by mass or more of total mass of the coating solution, and
- selecting the dichroic dye having an anisotropy value Rm of 0.25 or higher and 0.94 or lower, the anisotropy value Rm satisfying equation (1), and
- the light control sheet exhibiting the second state has a total light transmittance T of 10% or more and 80% or less
- Anisotrophy
-
- value
-
- Rm
- ≥
- 0
- .
- 3
-
- 434
-
- ln
-
- (
- T
- )
- -
- 0.4297
- Equation
-
- (
- 1
- )
- where ln denotes a natural logarithm.
33 more elements
A method for producing a light control sheet including
- a first transparent electrode layer,
- a second transparent electrode layer, and
- a light control layer interposed between the first transparent electrode layer and the second transparent electrode layer, the light control layer including a transparent polymer layer containing a plurality of voids and a liquid crystal composition occupying the plurality of voids, the light control sheet being configured to exhibit a first state and a second state having a lower haze value than the first state, depending on a magnitude of a voltage applied to the light control layer, the method comprising:
- formulating a coating solution containing a liquid crystal compound, a dichroic dye, and a polymerizable composition;
- forming a coating film between the first transparent electrode layer and the second transparent electrode layer with the coating solution;
- and
- polymerizing the polymerizable composition in the coating film,
- wherein formulating the coating solution includes
- formulating the coating solution such that the liquid crystal compound accounts for 55% by mass or more of total mass of the coating solution, and
- selecting the dichroic dye having an anisotropy value Rm of 0.25 or higher and 0.94 or lower, the anisotropy value Rm satisfying equation (2), and
- the light control sheet exhibiting the second state has a total light transmittance T of 10% or more and 80% or less,
- Anisotrophy
-
- value
-
- Rm
- ≥
- 0.2989
- ln
-
- (
- T
- )
- -
- 0
- .
- 3
-
- 472
- Equation
-
- (
- 2
- )
- where ln denotes a natural logarithm.
32 more elements
Dependencies are inferred from the claim text.