This invention relates to a display, particularly, to a double-sided display structure that can be used to show the same or different still and/or moving images on two sides thereof, for example to such a display structure that can be used as an advertising sign.
Advertising signs are known in many different shapes, sizes and designs. A common design hitherto has been a sign having a multiplicity of square or triangular shaped prisms, which are arranged to rotate about their axes mounted generally side-by-side with their axes vertically. Each side of the prisms has a vertical strip of a poster or other image mounted on them, and the rotation is synchronized so that all the strips for one image are shown at once to make up a complete image. Thus, for triangular prisms, there can be three different images, which change periodically, as the prisms rotate. For square prisms there can be four different images, with both sides of the sign being visible and displaying different images.
Another type of advertising sign is one that is formed directly of a matrix of light emitting devices, whether of one colour or of several or many different colours. If the matrix is of light sources of a single colour, then they can be controlled to be turned on and off in particular patterns to provide a monochrome advertisement. If there are a large number, particularly if of different colours, then large, self-luminescent advertisements can be produced by programming the controller that controls the switching of the light sources on and off. As light emitting diodes have become available, especially in several colours, this has become a preferred form of the light source for such matrices. Such electronic signs can display either still or moving images. Such signs are not, however, generally double-sided unless two independent such signs are mounted back-to-back.
The present invention therefore seeks to provide a display structure that provides a double-sided display of the same or different still and/or moving images.
Accordingly, in a first aspect, the invention provides a double-sided display structure comprising a light transmitting element comprising a light transmitting material, the light transmitting element having a pair of opposed light receiving faces and a pair of opposed light emitting faces substantially orthogonally disposed to the light receiving faces, a light reflecting layer disposed at an oblique angle to the light receiving faces and the light emitting faces, and a pair of light-emitting displays for displaying the same or different still and/or moving images and being mounted such that an image from a respective light-emitting display is emitted into a respective light receiving face and is transmitted through the light transmitting element to be reflected by the reflecting layer to a respective light emitting face, whereby the images received at the pair of opposed light receiving faces are visible to observers through the pair of opposed light emitting faces of the display structure.
In a preferred embodiment, the light transmitting material has a first refractive index and the light reflecting layer has a second refractive index different to the first refractive index, and the difference in the first and second refractive indices and the oblique angle are sufficient to cause the images to be substantially reflected by the light reflecting layer.
Preferably, the light transmitting material is a first fluid medium and the light reflecting layer includes a second fluid medium, different to the first fluid medium.
In one embodiment, the first fluid medium comprises a liquid, such as water or oil, for example silicone oil, within a tank formed of a solid, light transmitting material, such as glass or plastics material.
The second fluid medium preferably comprises gas, such as air, enclosed within a substantially planar element formed of a pair of walls sealed together at their periphery and formed of solid, light transmitting material, such as glass or plastics material.
In one embodiment, the tank is substantially cylindrical with a pair of end faces forming the pair of opposed light emitting faces, and opposite portions of the curved periphery form the pair of opposed light receiving faces, the planar element extending within the tank at an oblique angle to both the end faces of the tank and the opposed curved portions of the periphery.
Preferably, the planar element is provided with a pair of opposed extensions extending from opposite ends of the planar element at an obtuse angle thereto so as to contact the opposed end faces of the tank and to thereby retain the planar element in position within the tank.
In another embodiment, the tank is substantially cubical or cuboidal with a pair of end faces forming the pair of opposed light emitting faces, and a pair of side faces forming the pair of opposed light receiving faces, the planar element extending within the tank at an oblique angle to both the end faces and the side faces of the tank.
Preferably, the light transmitting element is formed of a pair of tanks of substantially prism-like shape, each having an oblique face substantially adjacent each other with a layer of air therebetween providing the light reflecting layer.
Alternatively, the light transmitting element may be formed of a solid light transmitting material and is formed in two parts of substantially prism-like shape, each having an oblique face substantially adjacent each other with a layer of air therebetween providing the light reflecting layer.
The two parts are preferably formed as right-angled triangular prisms.
The double-sided display structure preferably further comprises a mount for mounting the pair of light-emitting displays adjacent a respective light receiving face, the mount being generally opaque so as to hide the light-emitting displays and the light receiving faces of the light transmitting element.
The mount may comprise, in one embodiment, a pair of spaced mounting members, each member having one of the light-emitting displays and one of the light receiving faces therein, whereby the light transmitting element extends between the spaced mounting elements, such that the light emitting faces are viewable by observers between the spaced mounting members.
Alternatively, the mount may comprise an annular mounting member wherein the light-emitting displays and the light receiving faces are hidden therein, but the light emitting faces of the light transmitting element are visible through the center of the annular mounting member, such that the light emitting faces are viewable by observers.
Preferably, the images displayed by the pair of light emitting displays are different and one such image is visible to an observer looking at one of the light emitting faces and the other such image is visible to an observer looking at the other of the light emitting faces.
The double-sided display structure may comprise a plurality of said light transmitting elements mounted vertically next to each other, with a plurality of pairs of light emitting displays arranged adjacent the light receiving faces of the plurality of light transmitting elements.
The double-sided display structure may further comprise a light assembly arranged to shine light into the light transmitting element.
According to a second aspect, the invention provides an advertising sign comprising a double-sided display structure as described above.
Embodiments of the invention will now be more fully described, by way of example, with reference to the drawings, of which:
Thus, as best shown in
A generally cuboidal transparent block 5 is mounted between the pair of mounting elements 2, 3. The block 5 (as also shown in
As best shown in
As shown in
The light-emitting displays 14, 14′ are preferably similar to portable electronic displays of the well known type that display either still images, or moving images, which may be stored either in internal memory of the device, for example in MP4 format, on an external memory and coupled via a wire or wirelessly to the device, or be stored on a storage medium, for example a DVD or CD ROM and played by the device. It will be appreciated that the method whereby the image is displayed on the screen of each device is immaterial and any suitable method will suffice. In a preferred embodiment, the devices are portable MP4 players that can display either still or moving images, and can be programmed to change the images displayed either in a predetermined or in random sequence. The screens, can be either LCD or LED or any other suitable light-emitting display which generates an image that can be seen through the prisms.
Thus, it will be apparent that, in the above-described embodiment, the displays and the first faces of the prisms are enclosed within the mounting members and are not visible to an observer. An observer can only see a second face of a prism and there sees only an image from one of the diplays which has been reflected from the hypotenuse face of that prism. However, when an observer moves to look at the other second face of the other prism, only the other image from the other display is visible, and the two images thus appear to be visible from the two sides of the block 5 without any visible means of their generation.
Since each of the two images is independently generated, and is visible from an opposite face of the block 5, the advertising sign can be used to provide two different images and, if the sign is positioned, for example, at a doorway which serves as an entrance and an exit to a building, the sign could display a first image appropriate for someone entering the building on one side and an image appropriate to someone leaving the building on the other side.
Nevertheless, although the scale of the above described embodiment is shown as being fairly large, with the mounting members being firmly affixed in the ground so that the images are visible at about eye level of an observer, it will be appreciated that other embodiments could be made either smaller or larger. For example, it is envisaged that the device could be made of small acrylic prisms with small light emitting displays arranged on opposing faces, so that images, still or moving, could be displayed through the other opposed faces. Such a device could be made portable, event to the extent of being small enough to be attached to a key ring, for example to display souvenir images of a particular location, with or without advertising images displayed thereon. Such a souvenir image display could thus be made relatively cheaply, if the light emitting displays were to be made cheaply, for example displaying a small selection of images, such a set of slides
Alternatively, the structure could be made even larger that originally described, by mounting several blocks made up of pairs of prisms, with associated displays, vertically next to each other in the mount, with the mounting members being elongate and extending vertically, so that a number of images can be seen from each side of the sign.
In another embodiment, as shown schematically in
If desired, depending on the images to be displayed and the effects that may be required, a lighting assembly may also be provided to shine light onto the top and/or bottom faces of the prisms.
A further embodiment of the invention will now be described with reference to
As can be seen in
A still further embodiment of a display structure can be seen in
It will be appreciated that although only a few particular embodiments of the invention have been described in detail, various modifications and improvements can be made by a person skilled in the art without departing from the scope of the present invention. For example, it will be apparent that it does not matter what media are used for the light transmitting element, provided that the light from the light emitting displays can pass through the medium to the reflecting layer, which, again, can be of any material, including a double sided reflecting material, such as a mirror, if desired, although a layer of a medium having a different refractive index to that of the material forming the light transmitting element is preferable. The shape of the light transmitting element may be any desired shape, for example cubic, cuboidal or cylindrical, as described, or any other desired shape. Furthermore, as explained, the scale of the display structure can be anything from portable in one hand, or smaller, to large fixed structures, and can be used to display images, such as souvenir images, which can be still or moving, or advertising images, whether commercial advertising, or information signs or images. Finally, as explained, the light emitting element can be solid or liquid and can be formed of two separate parts with a layer of air therebetween, or as a single element with a layer of air or other appropriate material arranged within the element to provide the reflecting layer.
Number | Date | Country | Kind |
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0911190.7 | Jun 2009 | GB | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2010/003932 | 6/29/2010 | WO | 00 | 12/23/2011 |
Publishing Document | Publishing Date | Country | Kind |
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WO2011/000545 | 1/6/2011 | WO | A |
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20080291152 | Nakao et al. | Nov 2008 | A1 |
Number | Date | Country | |
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20120096749 A1 | Apr 2012 | US |