mounted disks which have opposite bright and dark surfaces the bright surface of each disk is illuminated by an adjacent light emitter when positioned in a direction of viewing light from each light emitter is blocked from illuminating disks other than the adjacent disk in the array application_number US 20408598 A description in the drawings fig1 shows a portion of a column of display elements in accord with the invention the stator 10 of each element shows an open front housing with base 12 side walls 14 s end walls 14 e extending forwardly from the base to define a square display element having a good packing factor and making efficient use of the display area at diametrically opposed corners of the element square towers 16 have wells 18 to receive the spindles 20 of a display disk having a dark side 22 d and a bright side 22 b the disk is notched at 31 to allow it to rotate past the then adjacent core 26 in moving between limiting positons the drive is preferably magnetic and a magnet 24 has its n s axis transverse to the rotation axis of the disk and is driven by the switching of the cores 26 b and 26 d which.