Abstract: A Braille display for denoting characters by the positions of six or eight movable projections or pins (10, 11, 12) arranged in two parallel columns. Each projection is movable between an elevated position and a lowered position by a rotary cam actuator (30) so that different rotary positions of the cam members (31) cause the projections to adopt different predetermined permutations of the elevated and lowered positions of the projections corresponding to respective characters to be denoted by the Braille display. There is one cam member (31) for each column of projections. Drive elements in the form of stepping motors (35) selectively rotate the cam members (31) between their different rotary positions. Each pin (10, 11, 12) preferentially adopts its lowered position, e.g. by action of biasing springs (20, 21, 22).