DISPLAY DEVICE

Dual-image devices (19) direct light in left and right directions (1,2) to display different images (1,2), e.g. stereoscopic images. A cross-talk problem (dual-images are visible in a normal direction 9') is addressed. According to a first invention, LC molecules of a non-twisted LCD cell (20') are aligned parallel with (or perpendicular to) the input polarisation, so that a tilt, which may be induced by applying a usual driving voltage (0-5 volt) to modulate oblique light, has no effect in the normal direction. The second invention differs: right-left symmetry is ensured by orientations layers of a twisted LCD cell (20'') which are symmetrical (±45°) with respect to a vertical input polarisation; and a pre-tilt, which may be induced by driving the cell above a threshold voltage (3 volt) with a special driving voltage (3-10 volt) to modulate oblique light, has no (significant) modulation effect in the normal direction (shorter optical path length), if the retardation value of the twisted LCD cell (20'') is low (dDeltan