In this work we investigated the electro-optic properties of nematic liquid crystals (NLC) aligned by photo-oriented azo-dye films. We found that the response times depend on the terms of orienting film preparation, We have measured the electro-optic characteristics of LC cells with twist orientation, obtained by photo-processed orienting films. We have found that the photo-oriented films prepared with the azo-dyes investigated are thermostable.