Optics: image projectors – Composite projected image
Reexamination Certificate
1998-09-21
2001-02-27
Dowling, William (Department: 2851)
Optics: image projectors
Composite projected image
C353S048000
Reexamination Certificate
active
06193375
ABSTRACT:
RELATED APPLICATIONS
This application is based on Application No. HEI 9-256377 filed in Japan, the content of which is hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a display device such as a head-mounted display (HMD) and display device for projectors of the laser scanning type.
2. Description of the Related Art
Heretofore, in liquid crystal display devices such as head-mounted displays, background projection type projectors and the like, so-called multiple panel type display devices have been realized which use a plurality of superposed liquid crystal panels to display wide area or high resolution images. Such display devices, for example, divide an original image vertically and horizontally among a plurality of liquid crystal panels, and by means of and optical system which receives the light of each area projects the image of each area on a screen with consideration given to the projection distance.
In this instance, resolution can be maintained while realizing a display of a wide area if the number of pixels of the screen used as a reference is used directly in plurality grouping. Furthermore, high resolution can be attained using the same screen size if the screen used as reference is divided and the number of pixels of each screen after division is set at the same number of pixels as the original reference screen. More simply, CRT displays may be arranged in multiple grouping to achieve wide area display. This arrangement is typically called “multivision.”
Well understood disadvantages arise in the aforesaid multiple panel type liquid crystal display, however, inasmuch as the borders of each screen are visible and overlap so as to produce a so-called black matrix over the entire screen. As a result, conventional methods must invariably use discrete light sources for each screen, and since projection of the image is accomplished by optical units which receive the light of each area, attempting to eliminate the borders around each screen produces blurring which prevents accurate overlapping of adjacent areas.
Magnification and screen size vary due to slight differences of the optical path of each optical unit. Furthermore, gaps open between the various screens due to interference of adjacent elements of the optical units, and mechanical errors prevent overlapping. When using the aforesaid multivision type CRT display, a frame is clearly apparent on the periphery of each Braun tube from the original. Extremely complex mechanical elements are required to achieve tight overlapping of the areas, with the result that errors cannot be eliminated.
SUMMARY OF THE INVENTION
An object of the present invention is to eliminate the previously described disadvantages.
Another object of the present invention is to provide an improved display device which provides a single image by combining a plurality of display images.
Still another object of the present invention is to provide a display device capable of displaying wide area and high resolution images without uncomfortable borders between images.
Yet another object of the present invention is to provide a display device capable of displaying a single large image with a clear border on the image periphery using a plurality of scanning optical units.
These and other objects are attained by providing a display device comprising; a plurality of light sources, a plurality of scanner for scanning light emitted from the light sources, and a screen to project from behind an array of a plurality of scanned images.
The aforesaid objects are further attained by providing a display device comprising; a plurality of light sources, a plurality of scanner for scanning light emitted from the light sources, a screen for projecting from behind an array of a plurality of scanned images, a sensor for monitoring the border areas between images, and a controller for controlling a position of the image on the screen based on an output of the sensor.
The invention itself, together with further objects and attendant advantages, will be best understood by reference to the following detailed description taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4772095 (1988-09-01), Spencer
patent: 5023725 (1991-06-01), McCutchen
patent: 5085495 (1992-02-01), Iwahara et al.
patent: 5153621 (1992-10-01), Vogeley
patent: 5181122 (1993-01-01), Ooishi
patent: 5539483 (1996-07-01), Nalwa
patent: 5640171 (1997-06-01), Shimada
patent: 5913591 (1999-06-01), Melville
Nagata Hideki
Sato Akira
Burns Doane , Swecker, Mathis LLP
Dowling William
Minolta Co. , Ltd.
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