| 摘要 |
PROBLEM TO BE SOLVED: To obtain a double refractive index control effect type liquid crystal display device with which the unequal display is prevented and the display grade is improved. SOLUTION: The surface temp. difference arising on the display surface of a liquid crystal display element 23 heated by a back light 24 of a liquid crystal display device 25 having, for example, the STN type liquid crystal display element 23 subjected to photoirradiation from behind by the back light 24 is specified to >=1 to <10 deg.C. The temp. change rate of the refractive index anisotropyΔn of the liquid crystals 19 of the liquid crystal display element is set at <=0.50(%/ deg.C) and the temp. change rate of the dielectric anisotropy As thereof is set at <=0.75(%/ deg.C).
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