Head-up display with two fresnel lenses
First Claim
1. A head up display system having an HUD optical axis, said head up display for installation in or adjacent to a dashboard of a vehicle and comprising:
- a first Fresnel lens adapted to be provided on an upper plate of the dashboard;
a liquid crystal display positioned below and spaced apart from said first Fresnel lens, said liquid crystal display and said first Fresnel lens defining a space therebetween;
instrument meter clusters disposed in said space;
a first light source provided below said liquid crystal display;
a combiner adapted to be positioned above the upper plate of the dashboard and having a reflecting optical axis, for reflecting a virtual image of said liquid crystal display which is transmitted by said first Fresnel lens through said space so as to cause said virtual image of said liquid crystal display to be visible to a driver;
a second light source provided behind said instrument meter clusters; and
a second Fresnel lens disposed in said space in front of said instrument cluster meters so as to cause said virtual image of said instrument meter clusters to be visible to the driver.
1 Assignment
0 Petitions
Accused Products
Abstract
A head up display is provided for projecting as a virtual image the information from control meters in an airplane or an automobile in the front visual field. The display includes a light source disposed at the bottom of a casing, an LCD shutter disposed just above the light source, a first Fresnel lens disposed on the upper surface of the casing for the purpose of enlarging information on the LCD shutter, and a combiner disposed at an adjustable angle on the upper surface of the casing for the purpose of producing a virtual image of the information on the LCD shutter. The first Fresnel lens is disposed on the same face as that of the dashboard, and another Fresnel lens is provided on the front side of the casing so that the meter can be directly viewed through the casing.
70 Citations
14 Claims
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1. A head up display system having an HUD optical axis, said head up display for installation in or adjacent to a dashboard of a vehicle and comprising:
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a first Fresnel lens adapted to be provided on an upper plate of the dashboard; a liquid crystal display positioned below and spaced apart from said first Fresnel lens, said liquid crystal display and said first Fresnel lens defining a space therebetween; instrument meter clusters disposed in said space; a first light source provided below said liquid crystal display; a combiner adapted to be positioned above the upper plate of the dashboard and having a reflecting optical axis, for reflecting a virtual image of said liquid crystal display which is transmitted by said first Fresnel lens through said space so as to cause said virtual image of said liquid crystal display to be visible to a driver; a second light source provided behind said instrument meter clusters; and a second Fresnel lens disposed in said space in front of said instrument cluster meters so as to cause said virtual image of said instrument meter clusters to be visible to the driver. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A head up display system having an HUD optical axis, said head up display system for installation in or adjacent to a dashboard of a vehicle and comprising:
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a casing; a first Fresnel lens mounted on said casing such that when said casing is mounted on the vehicle, said first Fresnel lens is disposed substantially parallel to an upper plate of the dashboard; a liquid crystal display positioned below and spaced apart from said first Fresnel lens within said casing, said liquid crystal display and said first Fresnel lens defining a space therebetween; instrument meter clusters disposed in said space; a first light source provided below said liquid crystal display within said casing; a combiner positioned above said first Fresnel lens and having a reflecting optical axis, for reflecting a virtual image of said liquid crystal display which is transmitted by said first Fresnel lens through said space so as to cause said virtual image of said liquid crystal display to be visible to a driver; a second light source provided behind said instrument meter clusters within said casing; and a second Fresnel lens disposed within said casing in said space in front of said instrument meter clusters so as to cause a virtual image of said instrument meter clusters to be visible to the driver. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification