The fabrication of an optical image converter composed of CdS/CdTe photo-sensitive heterojunction film and nematic liquid crystal film is investigated. Its performance is described in this paper. The CdS film and the CdTe film is vacuum evaporated under careful monitoring in order to obtain high photo-sensitivity and high electrical reactance. The correlation between the optical and electrical parameters of these composing films and the performance of the device is discussed. It is shown that these properties dopend not only on the parameters of each individual film but also on the matching between different films under optimization.