<title>Thin crystalline film retarders for LCD</title>

Abstract

We have studied a new class of materials for LCD retarders produced by Cascade crystallization method. Advanced materials comprise the amphiphilic compounds and include salts of carboxylic and sulfonic acids with conjugated aromatic cores, which do not absorb light in visible range of light spectra. The Cascade crystallization method of manufacturing of the thin crystalline films (TCF) is based on printing from aqueous solution of lyotropic liquid crystal phase. We have produced and examined a series of retardation films that exhibit properties of negative A-plates. As compared to conventional retardation materials, new retardation films produced with the Cascade crystallization method are strikingly thinner (thickness range is 100 -1000 nm), whereas birefringence is typically much higher (delta n varies from 0.05 to 0.40). Such a broad range of available thickness and retardation values makes feasible tailoring of LCD designs for customer needs. Viewing angle performance of the crossed polarizers is significantly improved in the presence of TCF retardation films, so that the light leakage at oblique incidence decreases several times. Formation of the new coatable stretchiess retardation coatings by a roll-to-roll process can be easily incorporated into the techniques widely used in the LCD industry. The TCF retarders are aimed for LCD HTV application and open up opportunities for the manufacturing cost reduction.

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“…It shows broad peaks between 3600 and 2500 cm À1 and 1650 and 1400 cm À1 corresponding to stretching vibrations of cyclohexylammonium (nNH 3 + , nC-H) and (nO-H) of P-OH groups, respectively. 41 The stretching vibrations of the PO 2 central groups are observed between 1100 and 1300 cm À1 , those between 1260 and 955 cm À1 correspond to stretching vibrations of the PO 3 terminal groups 42,43 and those ranging from 975 to 650 cm À1 correspond to stretching P-O-P modes. 44 The bending vibrations of the PO 3 terminal groups are situated in the interval 610-460 cm À1 .…”

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