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US 11,143,898 B2Granted
Multicolor liquid crystal writing device
AssigneeWicue, Inc.
InventorsFenghua Li, Rui Bao
Life of this patent
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Abstract
Described are multicolor liquid crystal writing devices that exhibit high brightness and contrast and methods for manufacturing multicolor liquid crystal writing devices that exhibit high brightness and contrast. The liquid crystals used in the devices and methods described are photosensitized using UV light to modify a reflective character of the liquid crystals and different amounts, intensities, wavelengths, or exposure durations of UV light provide for different reflective colors.
Claims12
A liquid crystal device comprising:
- a first conductive layer;
- a second conductive layer;
- and;
- a liquid crystal film between the first conductive layer and the second conductive layer, the liquid crystal film comprising a liquid crystal layer including cholesteric liquid crystals, the cholesteric liquid crystals comprising nematic liquid crystals and a photosensitive chiral dopant, the liquid crystal layer including a first region and a second region, the first region and the second region correspond to transversely separated areas across the liquid crystal layer, wherein:
- the first region corresponds to a first ultraviolet (UV) light exposure region,
- the second region corresponds to a second UV light exposure region,
- the first UV light exposure region and the second UV light exposure region correspond to regions of different UV light exposure across the liquid crystal film,
- the liquid crystals in the first region are photosensitized by UV exposure, based on the first UV light exposure region, to have a first pitch, and
- the liquid crystals in the second region are photosensitized by UV exposure, based on the second UV light exposure region, to have a second pitch that is different from the first pitch.
6 more elements
Dependencies are inferred from the claim text.