Over the last decade, as Artificial Intelligence (AI) has become more capable, the demand for replacing human judges by the AI or other algorithmic decision-making systems is far greater than before. Needless to say, AI is one of the major milestones on the way to the completed modernization of judicial system, since AI can enhance the quality and efficiency of judicial services in various aspects. By the way, the use of AI in the judicial system must be in responsible manners. That is to say, the movement toward the full-scale digitalization must be in compliance with the right to a fair trial, which is the basic fundamental right in judicial proceedings. This paper seeks to map out, on the basis of the right to a fair trial, the limits of deploying AI in the judicial frameworks in order to address these new concerns.