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US 8,264,621 B2Granted
Viewing device for widescreen comprising means of correcting the doubling of images due to said widescreen
AssigneeThales
InventorPhilippe Augereau
Life of this patent
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AssigneeThales
InventorPhilippe Augereau
Estimating the term…
The general technical field of the invention is that of viewing devices mounted on vehicles and comprising a display whose image is reflected by the windscreen of the vehicle, making it possible to superimpose the displayed image on the outside world. One of the major problems with this type of display is that the windscreen gives, by reflection, two non-superimposed doubled images. The basic principle of the invention is that the initial image is such that the combination of the first reflected image and the second image reflected by the windscreen gives a “clean” or “ideal” perceived image without any offsets. To perform this function, an image is generated on the display that comprises, obviously, the “ideal” image, but also a succession of offset images comprising negatives of the “ideal” image so that the resultant sum of the first reflected image and of the second reflected image includes no more than the “ideal” image. Obviously, the principle of the invention can be applied to simple displays or to displays comprising an image collimated to infinity or to a great distance.
Viewing device comprising at least one display (1) and means of generating an initial image IINIT on said display, the image being referenced in a reference plane (x,y), said device being intended to be mounted in a vehicle and used with a windscreen (2), the arrangement of the viewing device being such that, the device being mounted in the vehicle, the image is reflected on an area of the windscreen before being perceived by a user, said windscreen including at least two reflecting dioptres, an internal dioptre (21) and an external dioptre (22), the internal dioptre giving, from the initial image IINIT, a first reflected image IREF1 the external dioptre giving, from the initial image IINIT, a second reflected image spatially offset from the first reflected image IREF2, the offsets being denoted (dx,dy) in the plane (x,y), the relative reflection coefficient of the second image relative to the first image being equal to k, k being strictly less than 1, the image seen by the user being the sum of these two reflected images, wherein the initial image IINIT generated on the display is equal to a succession of offset images, each image being alternately the “positive” and the “negative” of an ideal image IIDEAL, such that
Viewing device comprising at least one display, means of generating an initial image IINIT on said display, the image being referenced in a reference plane (x,y) and means of collimating the initial image, said means having an optical power P, said device being intended to be mounted in a vehicle and used with a windscreen, the arrangement of the viewing device being such that, the device being mounted in the vehicle, the collimated image P.IINIT is reflected on an area of the windscreen before being perceived by a user, said windscreen including at least two reflecting dioptres, an internal dioptre and an external dioptre, the internal dioptre giving, from the collimated image P.IINIT, a first reflected image IREF1, the external dioptre giving, from the initial image IINIT, a second reflected image angularly offset from the first reflected image IREF2, the offsets denoted (dα,dβ) corresponding to offsets (dx,dy) in the plane (x,y), the relative reflection coefficient of the second image relative to the first image being equal to k, k being strictly less than 1, wherein the image seen by the user being the sum of these two reflected images, the initial image IINIT generated on the display is equal to a succession of offset images, each image being alternately the “positive” and the “negative” of an ideal image IIDEAL such that
Dependencies are inferred from the claim text.