OPTICAL DEVICE, POLARIZING PLATE, RETARDATION FILM, ILLUMINATING DEVICE, AND LIQUID CRYSTAL DISPLAY

摘要

An optical device is obtained as follows: a coating liquid is obtained by dissolving a polymerizable liquid crystal compound, a polymerization initiator and a chiral agent, and additionally if necessary, a surface active agent, an alignment control agent and the like in a solvent; the coating liquid is applied onto an isotropic transparent film in a film form and dried thereon; and then the dried film is subjected to polymerization. In this optical device, the lower limit ?<SUB>L</SUB> of the range reflecting light at an incident angle of 0 degree is longer than the wavelength ?<SUB>R1</SUB> of the light exhibiting the maximum emission intensity in a wavelength range of 600-700 nm among the light emitted from the light source, and the average transmittance to light having a wavelength of 600-700 nm at the incident angle of 60 degrees is not less than 40% but not more than 90%.