A directional backlight device comprising: at least one light guide plate; a light source configured to provide light to the at least one light guide plate; and a first group of grating elements and a second group of grating elements disposed on an emission surface of the at least one light guide plate and configured to externally emit the light from the emission surface, wherein first and second gratings of the first group of grating elements are arranged such that light beams emitted by the first grating of the first group of grating elements propagate through a first pixel point location that is spaced apart from the emission surface and such that light beams emitted by the second grating of the first group of grating elements propagate through a second pixel point location that is spaced apart from both the emission surface and the first pixel point location, characterised in that first and second gratings of the second group of grating elements are arranged such that light beams emitted from the first grating of the second group of grating elements propagate through the first pixel point location and such that light beams emitted by the second grating of the second group of grating elements propagate through the second pixel point location, and in that the first and second groups of grating elements are arranged such that the light beams emitted by the first and second groups form respective first and second groups of view points, and that a second region within which the second group of view points is formed does not overlap with a first region within which the first group of view points is formed. at least one light guide plate; a light source configured to provide light to the at least one light guide plate; and a first group of grating elements and a second group of grating elements disposed on an emission surface of the at least one light guide plate and configured to externally emit the light from the emission surface, wherein first and second gratings of the first group of grating elements are arranged such that light beams emitted by the first grating of the first group of grating elements propagate through a first pixel point location that is spaced apart from the emission surface and such that light beams emitted by the second grating of the first group of grating elements propagate through a second pixel point location that is spaced apart from both the emission surface and the first pixel point location, characterised in that first and second gratings of the second group of grating elements are arranged such that light beams emitted from the first grating of the second group of grating elements propagate through the first pixel point location and such that light beams emitted by the second grating of the second group of grating elements propagate through the second pixel point location, and in that the first and second groups of grating elements are arranged such that the light beams emitted by the first and second groups form respective first and second groups of view points, and that a second region within which the second group of view points is formed does not overlap with a first region within which the first group of view points is formed.