DE20114295U1 - Video container - Google Patents

Description

HS Consulting GmbH, Kantstraße 99, 42553 Vebeir

Video container

Gl2205GB

Description:

The present invention relates to a device for projecting large images, which is designed to be stackable.

Known devices for projecting large images have a large screen or, in the case of beam projection, a large screen onto which an image is projected. If the screen is large enough to create an image impression for the viewer from a greater distance, the installation is costly and time-consuming.

The object of the present invention is to provide a means for displaying video images which can be easily and largely set up anywhere and wherein the surface onto which a large image can be projected is variable in size.

The device according to the invention for projecting large images has at least one stackable projection surface. For example, this is a projection screen, also known as a canvas. In accordance with the "German Industrial Standard" for projection screens - DIN 19405 - there can be different projection screens.

Type D (diffuse): refers to a diffusely reflecting surface and represents a more or less matt white surface that disperses the light evenly. This screen therefore offers a uniform but not too bright image impression from all viewing directions.

Type S (Speculum): This code letter designates metallized surfaces that reflect the incident light like a mirror, for example a silver cloth. In physical terms,

thus "angle of incidence equals angle of radiation", which is called angular-reflective.

Type B (Beaded): a screen of this type reflects light back in the direction from which it came (also called "retro-reflective"). These are beaded screens, for example myriads of tiny glass beads embedded in a base material.

The device according to the invention for projecting large images also has means for stacking several projection surfaces. These are preferably designed so that the individual projection surfaces can be stacked so that the area available for projection is then larger than the individual projection surface. For example, the means for stacking comprise a frame surrounding the respective projection surface. The frame has sufficient load-bearing capacity so that several projection surfaces can be stacked on top of one another so that the area onto which the projection can be made is thereby increased. The frame is designed, for example, so that several projection surfaces stacked on top of one another are almost adjacent to one another. A transition between the individual projection surfaces, which would disturb the image impression, is thus largely avoided.

For example, the means for stacking comprise recesses on one side of the projection surface or frame and complementarily shaped protruding parts on the other side of the projection surface or frame, so that they interlock when stacked on top of each other and thus increase the stability of the stacked projection surfaces.

The device according to the claims further comprises projection means which are arranged and designed such that they project an image onto the projection surface or onto the stacked projection surfaces.

For example, these are devices that use a moving laser beam to create images on the projection surface.

For example, colored light sources are used that illuminate the respective projection surface. Furthermore, the projection means and the projection surface can have a

Liquid crystal display with thin film transistor or double super twisted nematic structure. In particular, these have a reflective thin film transistor liquid crystal display. Such displays do not require a backlight but use specially developed electrodes with a micro-reflection structure to generate the image. This enables use in direct sunlight.

For example, these can also be projection devices that have several LEDs arranged in one or more large arrays. The device can be used as an indoor or outdoor display system, as a dynamic advertising board, information display in sports halls and stadiums or as a general information display for displaying text and graphic information.

By using LEDs, the projection media are particularly long-lasting.

Advantageously, projection means are used which cause the image to be projected onto the projection surface or surfaces using light waves with a wavelength of 400 to 700 nm. As a result, the device according to the invention for projecting large images can be manufactured particularly inexpensively and insensitively.

Preferably, at least one slide projector or one video projector is used for this purpose. These projectors can easily be purchased commercially. When using several projectors, their individual control via control electronics is particularly easy to accomplish. For example, if there are several projection surfaces stacked on top of each other, the projector(s) each project an image onto the total surface that results from the stacked projection surfaces.

Preferably, the projection means are arranged or designed such that one image is projected onto one projection surface at a time.

This creates a sufficient light intensity or luminance on each projection surface. Furthermore, each projector can be controlled separately and the simultaneous but different projection onto each projection surface creates a special optical effect for the viewer, drawing the viewer's attention to the large image.

The device according to the invention advantageously has a projection surface which is designed in such a way that, in the case of rear projection, an image appears on the front. In this transmitted-light projection, the projection means are not located in a disturbing manner in the area from which the projected image is viewed.

The suppression of ambient light ensures significantly better image contrast and therefore more vivid colors when projecting from the rear.

Furthermore, the viewer is not spatially disturbed by the projection media. In particular, if he happens to look into the projector, he is not blinded,

It also prevents air pollution from making the projection beams visible and thus disrupting the viewer's impression of the image. Furthermore, air pollution, rain or strong ambient light, which may impair the projection, can remain unaffected.

For example, the projection means are arranged as close as possible to the projection surface in order to obtain a structure with a large surface area but a comparatively small depth. In order to be able to project onto a large surface, the projection means have, for example, one or more mirrors, so that the image is projected onto the projection surface via these mirrors.

For example, the projection surface for rear projection has a frosted screen, for example made of frosted glass.

In particular, ground glass screens with a multi-layer structure use the light output of the projectors particularly effectively. For example, concentric circles ground into the back form a fine lens structure (Fresnel lens) with a defined optical focal length, which initially aligns the point-shaped light cone from the projector in an almost cylindrical manner as it passes through the screen. Then a fine, vertically arranged strip lens profile (lenticular layer) on the front of the screen ensures that the light beam is expanded in an exclusively horizontal plane as the light "cylinder" emerges.

In contrast to a diffusely scattering screen, this achieves an extreme concentration of the available projection light in the direction of the viewer. No light is deflected unused towards the floor or ceiling, which can create a "light-enhancing" effect. The image brightness is maintained even at a large lateral viewing angle.

Furthermore, parts of the device according to the invention are advantageously designed to be weatherproof in order to enable outdoor use under all weather conditions.

In the device according to the invention, the dimensions of the projection surface are preferably greater than 1.20 m,

The device according to the invention also advantageously comprises at least one stackable container, wherein a side wall of the container is a projection surface.

The container is suitable for accommodating parts of the device. Furthermore, the use of a container increases the stackability of the device, for example due to the relatively large base area of the container or its external design.

For example, the containers can also be dimensioned so that they can be stored on Euro pallets to facilitate transport to and from the site.

In one embodiment of the invention, construction containers are used for this purpose, which are commercially available and designed to be stackable.

For example, the respective side wall of the container is a screen onto which an image is projected from the inside of the container. This image is then also visible to a viewer who looks at the container from the outside. Appropriate means, for example optical ones, can be provided so that a projected image appears correctly on the side surface to be viewed.

In the device according to the invention, several side walls of the container are advantageously projection surfaces. This creates a special visual impression for the viewer.

For example, if the side walls serving as projection surfaces border each other and different images are projected accordingly, a three-dimensional impression can be created for the viewer.

Furthermore, in the device according to the invention, the projection means are advantageously arranged inside the container. This protects them from external influences. In particular, ambient light is blocked out so that the projection is not impaired. Furthermore, air pollution or rain cannot interfere with the projection or even damage the projection means.

The device according to the invention advantageously has a generator for the electrical power supply. This makes it particularly easy to use the device, for example outdoors, without the need for a complex power supply.

Claims (11)

1. Device for projecting large images with at least one stackable projection surface, with means for stacking several projection surfaces, with projection means which are arranged and designed such that they project an image onto the projection surface or onto the stacked projection surfaces. 2. Device for projecting large images according to the preceding claim with projection means which project the image with light waves of wavelength 400 to 700 nm. 3. Device for projecting large images, wherein the projection means comprise at least one slide projector or at least one video projector. 4. Device for projecting large images according to one of the preceding claims, with a plurality of stacked projection surfaces, wherein the projection means are arranged or designed such that one image is projected onto one of the stacked projection surfaces. 5. Device for projecting large images according to one of the preceding claims, wherein the stackable projection surface is designed such that an image appears on the front side during rear projection. 6. Device for projecting large images according to one of the preceding claims, wherein parts of the device are designed to be weatherproof. 7. Device for projecting large images according to one of the preceding claims, wherein the individual stackable projection surface has dimensions above 1.20 m. 8. Device for projecting large images according to one of the preceding claims, with at least one stackable container and a side wall of the container is the projection surface. 9. Device for projecting large images according to one of the preceding claims, with at least one stackable container and several side walls of the container are each projection surfaces. 10. Device for projecting large images according to claims 8 or 9, wherein the projection means are arranged within the container. 11. Device for projecting large images according to one of the preceding claims with a power generator for supply.