Abstract 57 A heads up liquid crystal display including a twisted nematic liquid crystal panel (24) mounted behind a vehicle windshield (12) in the field of view of the operator. The display panel has crossed polarizers (26, 28) and is normally transparent so the operator can view all or part of the scene ahead of the vehicle through the display. Electrically activated display segments selectively form opaque portions on the display panel so that information is presented to the operator as a pattern of dark images in the viewing area. For viewing at nightime, ambient light is supplemented by artificial light passing through the display panel.
A heads up display for presenting information in the field of view of a vehicle operator characterised by a predominantly transparent liquid crystal display panel (10) mounted to the rear of the vehicle windshield (12) for frontal illumination by light passing through the windshield, the panel being positioned in the operator's field of view; the display panel comprising a twisted nematic liquid crystal cell (4) including energizing electrodes (34) for actuating portions of the display panel and crossed polarizing filters (26,28) on opposite sides of the cell so that only activated portions of the display panel are opaque to the frontal illumination thereby presenting information in the form of dark patterns in the operator's field of view.
Claim 2
Dependent Claim
117 words
A heads up display for presenting information in the field of view of a vehicle operator characterised by a predominantly transparent liquid crystal display panel (10) mounted to the rear of the vehicle windshield (12) for frontal illumination by light passing through the windshield, the panel being positioned in the operator's field of view; the display panel comprising a twisted nematic liquid crystal cell (4) including energizing electrodes (34) for actuating portions of the display panel and crossed polarizing filters (26,28) on opposite sides of the cell so that only activated portions of the display panel are opaque to the frontal illumination thereby presenting information in the form of dark patterns in the operator's field of view.
Claim 3
Dependent Claim
57 words
A heads up display as claimed in Claim 1, characterised by supplemental lighting for the display panel (10) comprising a source of radiation (40) and a layer (38) of material in front of the front polarizing filter (26) responsive to the source of radiation for directing light through the display panel to render the dark patterns visible.
Claim 4
Dependent Claim
59 words
A heads up display as claimed in Claim 2, characterised by the layer (38) of material in front of the front polarizing filter (26) comprising a layer of clear material which emits visible light when energized by ultraviolet radiation to further illuminate the display panel, and an ultraviolet source for irradiating the material provides the source of radiation (40).
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