Patent ID: 11938816
Assignee: ENVISICS LTD
Field: Optics (Instruments)
Classification: CPC B  G | IPC B  G

Claim 18:
19. A method of reducing the volume of a head-up display comprising a picture generating unit arranged to display picture content within a quadrilateral area on a screen and an optical system arranged to direct light from the quadrilateral area to an optical combiner, wherein the optical combiner is arranged to reflect the light from the quadrilateral area to an eye-box thereby forming a virtual image of the picture content, the method comprising:
restricting picture content to a sub-area of the quadrilateral area;
mapping the sub-area of the quadrilateral area onto an optical component of the optical system to identify an active area of the component;
shaping the optical component in correspondence with the active area to reduce the inactive area of the component;
wherein the step of restricting the picture content comprises excluding a region of the quadrilateral area which would otherwise form a virtual image overlaying an area closest to the vehicle and/or to one side of the quadrilateral area.