FIELD OF VIEW OPTIMISATION OF A HEAD-UP DISPLAY DEVICE

A head up display comprising an eye-box. The eye-box or eye-motion-box has a first dimension and second dimension. The head-up display is arranged to form a first image in a first image area at a first image area distance from the eye-box. The head-up display is further arranged to form a second image in a second image area at a second image area distance from the eye-box. An image area distance is a distance perpendicular to a plane containing the first dimension and second dimension. The first image and second image may be formed at substantially the same time, for example, from the same display event or in the same display interval. Alternatively, the first image and second image may be formed in rapid succession, for example, using time interlacing. The first image area distance is less than the second image area distance. The first image may be referred to as a near image or near-field image. The second image may be referred to as a far image or far-field image. The first image area is at least partially overlapping in the first dimension with the second image area. The overlap may be an overlap in angular space from the centre of the eye-box. The overlap may be apparent when viewed from the eye-box such as from the centre of the eye-box. The second image area extends less far in angular space than the first image area in at least one direction of the first dimension. In some embodiments, the second image area is cropped on at least one side so that the second image area extends less far than the first image area. The field of view of the second image area is less than the field of view of the first image area in at least one direction of the first dimension.