Temporally multiplexed display with landscape and portrait operation modes

A display device, comprising:

• a transmissive spatial light modulator comprising an array of pixels arranged to modulate light passing therethrough;
• a waveguide having an input end and first and second, opposed guide surfaces for guiding light along the waveguide, extending from the input end across the spatial light modulator, wherein the first guide surface is arranged to guide light by total internal reflection and the second guide surface has a plurality of light extraction features inclined to reflect light guided through the waveguide in directions allowing exit through the first guide surface as output light for supply through the spatial light modulator, the waveguide being arranged to direct input light from different input positions across the input end in output directions relative to the normal to the first guide surface that are dependent on said input position;
• and
• arranged between the waveguide and the spatial light modulator, an array of focusing elements aligned with respective light extraction features, which focusing elements each have a positive optical power in respective first meridians extending across the light extraction features and no optical power in respective second meridians perpendicular to the first meridians, the focusing elements being arranged with a focus on the respective light extraction features.