Seal for dynamic scattering-twisted nematic liquid crystal display

Claim 1

A matrix liquid crystal display device for video image using DTN mode comprising a pair of transparent substrates defining a pair of mutually facing surfaces, a transparent electrode assembly provided on each of said mutually facing surfaces, an insulating layer with orienting property formed on said electrode assembly, a liquid crystal layer formed by depolarization in a twisted nematic layer, said liquid crystal being nematic with a negative dielectric anisotropy, said liquid crystal layer being disposed between said mutually facing insulating layers, and a polarizer provided on the opposite surface of each of said substrates from said liquid crystal layer, said liquid crystal layer satisfying the following relationship within a range of ambient temperatures: ##EQU7## in which N stands for the number of multiplex driving, F stands for the frame frequency of an image signal, C stands for the capacitance per unit area of said insulating layers, and C o stands for the capacitance per unit area of said insulating layers when they have a specific dielectric constant ε of about 4, and a thickness of about 100 Å the fc value of the device being at least about 29 kHz, whereby the reproduction of a video image with a half-tone is achieved; said substrates being adhered to each other and sealed by two resin layers in which the outer layer is a thermoplastic polyamide layer and the inner layer is a saturated polyester layer having a higher melting point than said polyamide.