Transflective liquid crystal display with patterned optical layer
一种液晶显示器、光学层的技术,应用在制造这种显示器,图案化光学层领域,能够解决不是、降低对比度和图像锐度、模糊等问题,达到易于制造、避免视差问题、优化光学性质的效果
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example 1
[0092] The substrate is provided with an alignment layer (rubbed polyimide or photo-alignment layer). A mixture of active LC materials including some (active) isomerizable chiral compounds is spin-coated on top of the alignment layer, which provides a layer of cholesteric ordered material with a cholesteric pitch less than or equal to 300 nm. The mixture may further include a reactive achiral LC, a non-isomerizable chiral compound and a photoinitiator. The layer can be irradiated in a desired pattern so that in the irradiated regions (where the layer has become nematic) the isomerizable chiral compound is switched and the cholesteric pitch is increased to infinity. This can be achieved if the helical twisting power (HTP) of the isomerizable chiral compound is zero at the time of the switch, or if the product of the HTP times the concentration of the isomerizable chiral compound is divided by the HTP and the HTP present in the mixture after the switch The products of the conce...
example 2
[0095] In this second approach, active chiral LC compounds or mixtures of (chiral) active LC materials are used which exhibit a chiral nematic (cholesteric) phase as well as a smectic A phase. The material or mixture is spin-coated on a substrate provided with an alignment layer. At low temperatures, the material is in the smectic A phase and in this way forms a uniaxial retardation layer after spin coating. Irradiating the layer according to the desired pattern will produce photopolymerization in the irradiated areas. Subsequently, the temperature is raised above the transition temperature from the smectic A phase to the cholesteric phase. In the non-polymerized regions, the order will change from smectic to cholesteric, while the smectic order will remain in the polymerized regions. Flood exposure at elevated temperature will freeze the cholesteric order by photopolymerization and produce a patterned optical layer.
example 3
[0097] Biregions are prepared for example according to the methods described by Imura et al., J Photopolym Sci Technol 8, p. 257 (1995) and Schadt et al., Nature 381, p. 212 (1996) or other methods known to those skilled in the art A photoaligned alignment film where the director orientation is determined by the polarization of the UV light used during the two-step UV exposure. Liquid crystal mixture RMM34 (available from Merck) was spin-coated on top of a dual domain light alignment film, eg LPP 265 CP layer. This achieves planar alignment of the active LC monomers. Exposure through a UV mask under a nitrogen atmosphere partially cross-linked the optical layer to freeze into the desired planar state (tilt angle of 0°) required for λ / 4 retardation in the reflective portion of the pixel. The optical layer is then annealed at an elevated temperature for about 10 minutes. During the annealing step, the volatile surfactants in the liquid crystal mixture are evaporated so that a s...
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