International audienceThis paper proposes a reading of Derrida's "Double séance" (session / screening), in La Dissémination. Why did Derrida focus on Mallarmé, and especially on "Mimique" ? Because in Mallarmé' questioning, Derrida meets the same purpose his personal work is targeting : to stay within the logic of the text and within the field of literature, but from that border to thank the other border, where image and new operative devices are, where contemporary world belongs. To think that other border, Mallarmé invented a new screen device, the double screening.Le point de départ de ce travail est une lecture de « La double séance », dans La Dissémination de Jacques Derrida. Pourquoi Derrida s'est-il intéressé à Mallarmé, et notamment...