Optical: systems and elements – Projection screen – With reflector or additional screen
Patent
1994-08-02
1995-10-24
Wintercorn, Richard A.
Optical: systems and elements
Projection screen
With reflector or additional screen
348840, G03B 2156
Patent
active
054615100
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a method for assembling modules or elements in a panel structure, especially for assembling of display modules in a large screen according to the introduction of claim 1. The invention also concerns a device for assembling of modules or elements in a panel structure, especially for assembling of display modules in a large screen according to the introduction of claim 7.
Typical examples of panel structures of the kind described in the introduction are large screens for displaying television broadcasts or video film, where the large screen is composed of a number of display modules, each of which shows a section of the television or video picture. Each individual module therefore constitutes an independent television or video receiver and can be based on, for example, cathode ray tubes or large LCD modules. The panel structure according to the present invention may, however, also be in the form of large screens of a different kind, e.g. module-based light panels for advertising and information purposes or module-based solar panels which are linked together. In the case of such module-based panel structures, where the individual modules have some kind of electrical connection, there will be a frequent need to replace individual modules, e.g. for maintenance or repair of faults. The replacement should preferably be able to be performed while the panel structure, i.e. e.g. the large screen, is in operation, and without the necessity of disconnecting or removing other modules which do not require to be replaced. This means that assembling and disassambling of the modules should preferably be able to be performed from the back of the panel structure or screen.
From prior art there are known panel structures composed of modules, where the panel structure's supporting element is designed as a rigid, e.g., rectangular frame and the individual modules are fitted in the frame, a lattice-like device, which is secured in the frame, being used for this purpose. In this connection assembling or disassembling of the modules usually has to be performed from the front of the frame and often involves a considerable amount of work, which again results in the assembly and disassembly work becoming both time-consuming and expensive.
An additional factor is that, in order to support the weight of the display modules while simultaneously permitting the assembling and disassembling, the frame and lattice are designed with dimensions which cause the weight of the panel structure over and above the weight of the modules to become very great. Attempts have been made to avoid this by designing the lattice in the form of orthogonally crossing chords or wires which are under tension and permanently secured to the sides of the frame.
Finally the weight of the above-lying on the below-lying modules constitutes a problem with module-based panel structures or large screens of this type. Thus all prior art solutions for module-based large screens are both extremely heavy and present complications when replacing individual modules.
The object of the present invention is therefore to mitigate and eliminate the above-mentioned problems with prior art module-based panel structures for, e.g., large screens.
A further object is to provide a module-based panel structure which has as low a weight as possible and where the weight of the above-lying modules does not place a strain on the below-lying modules. Yet another object is that the modules should be able to be simply and easily replaced separately from the back, even while the panel structure is in use or the large screen in operation. A further object is to provide a panel structure wherein the mechanical loading on the individual modules is independent of the location of the module in the image surface. Another object of the present invention is to provide a panel structure with a tight fit between the individual modules and without the use of separate frames for each individual module in order to achieve such a fit. The last object will be of vital importance when the
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Cooper Iver P.
Wintercorn Richard A.
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