Television – Stereoscopic – Stereoscopic display device
Patent
1995-10-13
1997-09-30
Sikes, William L.
Television
Stereoscopic
Stereoscopic display device
349 73, 349 74, 349 84, 349152, G02F 1133, G02F 11347, G02F 11333, G02F 11345
Patent
active
056730918
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a liquid crystal display device comprising an array of pixels and including an assembly of at least first and second, elements each having a first face and a second face opposite the first face.
A device of this type is disclosed in French patent application No 2 656 451 filed 21 Dec. 1990 by the company MITSUBISHI.
This display device forms an array by edge-to-edge assembly of a plurality of liquid crystal panels. An electrode substrate comprising data bus lines and grid control bus lines is used to make the interconnections.
This device has a number of drawbacks including irregularities in the pitch of the pixels.
At present a strictly constant pitch between the pixels of an array liquid crystal display device can only be achieved by the use of a single element but in this case the maximal dimensions are limited to 300 mm by 400 mm due to limitations of the current technology.
Large liquid crystal display devices have been constructed from alphanumeric or mosaic modules assembled on X and Y axes to constitute a large alphanumeric display system. In these display systems there is virtually no perceptible irregularity of the pitch between the assembled alphanumeric modules.
U.S. Pat. No. 4,808,836 describes a display panel in which electrical continuity between LCD modules is achieved by contacts constituted by electrodes outside active display areas. Another object of this arrangement is to maintain a constant flatness between the modules (column 3--lines 3 through 13). This panel has the drawback that it cannot be used as a constant pitch graphics panel, mainly because it requires a mask.
At present there is no large display device using liquid crystals for applications in urban, railway station, airport, etc displays despite the obvious advantages of liquid crystals (in particular low power consumption and high reliability) as compared to the display devices known for such applications (including light-emitting diodes and electromagnetic display devices).
SUMMARY OF THE INVENTION
The invention therefore concerns a liquid crystal display device comprising an array of pixels which can be used to produce a large graphic display.
The display device of the invention is to this end characterized in that it comprises at least first and second display elements assembled together with an overlap between the ends of the elements so as to maintain a constant pitch between the pixels, said elements having an electrical connection first end including electric contacts disposed on a first face of said elements and a second end opposite the first end, the overlap being between the second end of the first face of the first element and the first end of the second face of the second element. By disposing the elements in the manner of roof tiles, it is possible to compensate the additional width due to the presence of an electrical connection area on one edge of the liquid crystal elements.
The first face of the device may include a rebate which extends it and which incorporates said electrical contacts.
Each element can be made in a manner that is known in itself in the form of two glass plates sealed together with a liquid crystal element trapped between them.
Each element can advantageously include an elementary matrix of pixels. The latter can be addressed electrically and either individually or in matrix-fashion.
In a preferred embodiment, the first ends of at least some of the elements are abutted against a corresponding lateral face of a housing.
The elements can advantageously be parallel to each other.
The display device of the invention may constitute a two-dimensional matrix of elements in which the elements overlap in one dimension and are disposed edge-to-edge in the other dimension. This leads to an assembly of the elements in the manner of roof tiles so that the pitch is always the same from one pixel to the next in the X direction and in the Y direction, both within the same element and on passing from one element to another in either direction
REFERENCES:
patent: 3846015 (1974-11-01), Moi
patent: 4106860 (1978-08-01), Kaufmann
patent: 4408836 (1983-10-01), Kikuno
patent: 4917466 (1990-04-01), Nakamura et al.
patent: 5519524 (1996-05-01), Fergason et al.
Patent Abstracts of Japan, vol. 8, No. 33, P-254 No. 58-189614 No Date.
Boisdron Jean-Francois
Chaudagne Michel
Ngo Julie
Sikes William L.
Souriau Diagnostic Electronique
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