Light control device
AssigneeToppan Holdings Inc.
InventorYuka Kurokawa
Life of this patent
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Abstract
A first light control device includes a first light control sheet and a driving unit that applies voltage to the first light control sheet. The haze of the first light control sheet is 80% or more when the first voltage is applied, and the haze of the first light control sheet is less than 10% when the second voltage is applied. In the first light control sheet, the difference in lightness index L* between when the second and third voltages are applied is 20 or more, and the difference in color coordinate a* is 15 or more or the difference in color coordinate b* is 20 or more between when the second and third voltages are applied.
Claims10
A light control device, comprising:
- a light control sheet comprising a first transparent electrode layer, a second transparent electrode layer, and a light control layer formed between the first and second transparent electrode layers;
- and
- a driving unit comprising circuitry configured to apply a first voltage, a second voltage, and a third voltage to the light control sheet such that a potential difference between the first transparent electrode layer and the second transparent electrode layer is zero at the first voltage and that the third voltage has a magnitude between the first and second voltages,
- wherein the light control layer of the light control sheet includes a transparent polymer layer having a plurality of voids and a liquid crystal composition filling the voids, and the light control sheet has a haze of 80% or more when the first voltage is applied, the haze of less than 10% when the second voltage is applied, a difference of 20 or more in lightness index L* between when the second voltage is applied and when the third voltage is applied, and a difference of 15 or more in color coordinate a* or a difference of 20 or more in color coordinate b* between when the second voltage is applied and when the third voltage is applied.
A light control device, comprising:
- a light control sheet comprising a first transparent electrode layer, a second transparent electrode layer, a light control layer formed between the first and second transparent electrode layers, a first alignment layer formed between the first transparent electrode layer and the light control layer, and a second alignment layer formed between the second transparent electrode layer and the light control layer;
- and
- a driving unit comprising circuitry configured to apply a first voltage, a second voltage, and a third voltage to the light control sheet such that a potential difference between the first transparent electrode layer and the second transparent electrode layer is zero at the second voltage and that the third voltage has a magnitude between the first and second voltages,
- wherein the light control layer of the light control sheet includes a transparent polymer layer having a plurality of voids and a liquid crystal composition filling the voids, and the light control sheet has a haze of 80% or more when the first voltage is applied and is a minimum voltage value, the haze of 15% or less when the second voltage is applied, a difference 20 or more in lightness index L* between when the second voltage is applied and when the third voltage is applied, and a difference of 15 or more in color coordinate a* or a difference of is 20 or more in color coordinate b* between when the second voltage is applied and when the third voltage is applied.
Dependencies are inferred from the claim text.