Optical component for wearable device

Abstract

An optical component for wearable device is provided to solve the problem of low dimming contrast ratio of the conventional glasses of wearable device. The optical component includes two parallel and opposite substrates and a liquid crystal layer filled with a liquid crystal material between the two substrates. The two substrates are respectively electrically connected to a voltage source to generate a switchable electric field between the two substrates. The inner side of the two substrates each have an alignment film. The surfaces of the two alignment films opposite to each other form a vertical alignment. A thickness of the liquid crystal layer is the distance between the two substrates. The liquid crystal material contains a negative nematic liquid crystal, a chirality molecule, and at least one dye. The birefringence of the negative nematic liquid crystal is between

Claims

1. An optical element for a wearable device, comprising: two substrates, parallel to each other, each substrate electrically connected to a voltage source, forming a switchable electric field between the two substrates, each substrate having an alignment film on its inner side, the opposing surfaces of the two alignment films being perpendicularly aligned; and a liquid crystal layer filled between the two substrates by a liquid crystal material, the thickness of the liquid crystal layer being the distance between the two substrates, the liquid crystal material comprising a negative liquid crystal, a cyclic molecule and at least one dye, the birefringence of the negative liquid crystal being between 0.05 and 0.09, and the product of the thickness and the birefringence being between 0.21 micrometers and 0.77 micrometers; when no voltage is applied to the voltage source, the liquid crystal layer is in a transparent bright state that allows incident light to pass through; when a voltage is applied to the voltage source, the liquid crystal layer is switched to a dark state that reduces the transmittance of incident light by absorbing at least part of the incident light.

2. The optical element for wearable devices as described in claim 1, wherein, The thickness of the liquid crystal layer is between 3 micrometers and 8.5 micrometers.

3. The optical element for wearable devices as described in claim 1, wherein, The rotational force of this molecule is between 8 micrometers⁻¹ and 12 micrometers⁻¹.

4. The optical element for wearable devices as described in claim 1, wherein, The weight percentage concentration of the cycloid in the liquid crystal material is between 0.55% and 1.2%.

5. The optical element for wearable devices as claimed in claim 1, wherein, The dye is at least one of the following: azo dyes, anthraquinone dyes, and phthalocyanine dyes.

6. The optical element for wearable devices as claimed in claim 1, wherein, The total amount of the at least one dye in the liquid crystal material is between 0.1% and 5% by weight.

7. The optical element for wearable devices as claimed in claim 1, wherein, Each substrate contains a transparent conductive material, such as indium tin oxide, nano silver wires, or a transparent conductive metal.

8. The optical element for wearable devices as claimed in claim 1, wherein, The voltage applied by this voltage source is between 0.2 volts and 30 volts.

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