Abstract: The invention relates to a message display panel comprising a plurality of light emitting elements arranged in matrix form on a display surface. Each emitter element is constituted by a first end face of an oblong body made of transparent material which comprises on its second end face at least one cylindrical housing in which a light emitting source is placed. The housing comprises a bottom 18 having a convex internal surface which concentrates the light flux received towards the first end face. The body is square in section and preferably comprises three housings each receiving an electroluminescent diode.

Abstract: The invention relates to a display matrix having light-conveying fibers that are maskable by disks each having a plurality of sectors and rotated by non-reversible motors each having two stable positions and under the control of a display control device. Each disk is provided with a detector device for detecting at least one angular position of said disk and connected to a device for monitoring matching, which device is itself connected to the display control device and acts on an activation device for the motor of said disk. The detection device advantageously includes a photoelectric sensor and a reflecting element disposed on a light-blocking sector of the disk.