JPS6317393B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a six-tube multi-projector that eliminates color differences at the boundaries of individual images projected by a plurality of six-tube projectors.

Background technology A projection type television receiver that projects images onto a screen using a six-tube projector equipped with two projection tubes each for the three primary colors of red, green, and blue is a stationary type television receiver. It can display images on a screen that is incomparably larger than that of a machine, and is therefore often used for viewing by a large number of people in large conference rooms and public plazas. Additionally, in a 6-tube multi-projector constructed by assembling multiple units of this type of 6-tube projector, each 6-tube projector can project its own image, or a single image can be projected as a whole. It is attracting attention as a video media that can handle a variety of video sources.

For example, as shown in FIG. 1, the projection tubes 1a are arranged in two horizontal rows, with the upper row being red R, green G, and blue B, and the lower row being blue B, green G, and red R, so that they are adjacent to each other on the left and right. There is a difference in the distance (optical path length) from the projection tubes 1a of the same color to the screen at the boundary portion of the image produced by the unit three-tube projector 1. As a result, as is clear from the white balance characteristics shown in Figure 1B, the gains B/G and R/G of blue B and red R based on green G become positive and negative at the boundary of the image. It had become extremely different.

In addition, the conventional 6-tube multi-projector 2
For the same reason that a difference in color occurs at the boundary between the images of the 6-tube projector 1 adjacent to the left and right, a difference in color also occurs at the boundary of the image of the 6-tube projector 1 adjacent to the top and bottom. For example, if all 6-tube projectors 1 project the same image, a sense of color difference may occur between adjacent images, or if a single image is projected as a whole, waves of color shading may occur. There were other drawbacks.

DISCLOSURE OF THE INVENTION The present invention eliminates the above drawbacks, and
Two sets of three-color projection tubes, red, green, and blue, are used as one unit.6
By arranging a plurality of tube projectors in parallel and arranging two adjacent units of 6-tube projectors so that the projection tubes of the same color are line-symmetrical with respect to each other's boundary line, the optical path length to the screen can be reduced. An object of the present invention is to provide a six-tube multi-projector that eliminates color steps at image boundaries based on differences.

To achieve this objective, the present invention provides red, green,
In a 6-tube multi-projector consisting of multiple units of 6-tube projectors arranged in parallel, with 2 sets of 3-color blue projection tubes in one unit, adjacent 2 units of 6-tube projectors are separated from each other by the boundary line. The gist is that the projection tubes of the same color are located at line-symmetrical positions.

According to the present invention, a plurality of units of 6-tube projectors are arranged so that the projection tubes of the same color are line-symmetrical with respect to the boundary line between two adjacent units, so that each 6-tube projector projected on the screen Of the images from each tube projector, the boundaries between adjacent images are projected by projection tubes of the same color that are equidistant from each other. It is possible to eliminate the difference in color at the boundary of the images produced by a 6-tube projector, for example, to eliminate the sense of incongruity between adjacent images when the same image is projected by any unit of 6-tube projector, or to eliminate the difference in color between images when a single image is projected as a whole. It is possible to reduce the wave of color shading, etc., which occurs when a large screen is used, and has excellent effects such as obtaining a good image that does not give the impression of roughness on a large screen.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to FIG. 2 and subsequent figures. 2 to 4 are a front view, a side view, and a white balance characteristic diagram of essential parts, respectively, showing an embodiment of the six-tube multi-projector of the present invention.

In Figures 2 and 3, 6-tube multi-projector 11
The inline type 6-tube projector 1 has 9 units of in-line 6-tube projector 1 in which 2 sets of projection tubes 1a of 3 colors of red, green, and blue are arranged in 2 rows horizontally in an upside-down order, and 3 units each in 3 stages at the top, middle, and bottom. The projection tubes 1a of the adjacent six-tube projector 1 are arranged in a matrix.
The arrangement is distinctive. That is, if we look at the four units of six-tube projector 1 that are adjacent to each other vertically and horizontally, with respect to the boundary line of each unit, projection tubes 1a of the same color
Care has been taken so that the lines are lined up line-symmetrically. Therefore, by reversing the arrangement of the projection tubes 1a of the 6-tube projector 1, which is a total of 5 units located at the center and on the left, right, top, and bottom of the center, blue, green, and red are displayed from the left in FIG. , red, green, blue, blue, green, red, or red, green, blue, blue, green, red, red, green, blue, 9
The unit projection tubes 1a are lined up in a row.

Therefore, the image boundaries of the 6-tube projector 1 that are adjacent to the left and right of the 6-tube multi-projector 11 are projected by the projection tubes 1a of the same color that are equidistant from each other, as shown in FIG. The conditions are similar to the image boundaries of the six-tube projector 1a of the vertically adjacent units shown. Note that 3 is a screen.

This is also clear from the white balance characteristics shown in Figure 4, where the gains B/G and R/G of blue B and red R with respect to green G are continuous at the boundary of the image. , there is no inconvenience such as extreme difference between plus and minus as in the conventional case. Therefore, the color level difference at the image boundary is eliminated, and an easy-to-see image without any chromatic discomfort or wave of color shading is obtained.

In the above description, the 6-tube projector 1 is not limited to the inline type, but can be used in three colors of red, green, and blue, such as the 6-tube projector 21 used in the 6-tube multi-projector 31 shown in FIG. projection tube 1a
Of course, it is also possible to provide two sets of delta types in which the vertices are located at each vertex of an equilateral triangle.

As explained above, according to the six-tube multi-projector 11 having the above configuration, two adjacent units of the six-tube projector 1 are line-symmetrical with respect to each other's boundary line, and the projection tubes 1a of the same color are line-symmetrical. Therefore, among the images projected on the screen 3 by each six-tube projector 1, the boundaries between adjacent images are projected by the projection tubes 1a of the same color located at the same distance. As a result, it is possible to eliminate the color difference at the boundary of images caused by 6-tube projectors in adjacent units, which has been a drawback in the past.For example, 6-tube projectors 1 in any unit can project the same image. It is possible to reduce the sense of incongruity between adjacent images when a single image is displayed, or the wave of color shading when a single image is projected as a whole, resulting in a good image without the harshness of a large screen. It will be done.

[Brief explanation of the drawing]

FIGS. 1A and 1B are a front view and a white balance characteristic diagram of the main parts showing an example of a conventional 6-tube multi-projector, respectively, and FIGS. 2 to 4 are a 6-tube multi-projector of the present invention, respectively. A front view, a side view, and a white balance characteristic diagram of main parts showing an example of the
FIG. 5 is a front view showing another embodiment of the six-tube multi-projector of the present invention. 1, 21... 6-tube projector, 1a... projection tube, 11, 31... 6-tube multi-projector.

Claims (1)

[Claims] 1. In a 6-tube multi-projector in which multiple units of a 6-tube projector are arranged in parallel, two sets of red, green, and blue three-color projection tubes are arranged in parallel, two adjacent
The unit 6-tube projector is a 6-tube multi-projector configured such that projection tubes of the same color are positioned in line-symmetrical positions with respect to each other's boundaries.