JPS6317392B2 - - Google Patents

Description

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

Background technology Projection type television receivers, which project images onto a screen using a projector consisting of three projection tubes that correspond to the three primary colors of red, green, and blue, are different from stationary type television receivers. Images can be projected on an incredibly large screen, and for this reason, it is often used for viewing by a large number of people in large conference rooms, public squares, etc. In addition, a 3-tube multi-projector constructed by assembling multiple sets of 3-tube projectors of this type is capable of projecting a unique image for each 3-tube projector, or for projecting a single image as a whole. Because it allows you to
It is attracting attention as a video media that can support a variety of video sources.

For example, as shown in FIG. 1A, a conventional three-tube multi-projector 2 is constructed by arranging nine sets of three-tube projectors 1 in three rows and columns in parallel.
Every three-tube projector 1 has a projection tube 1a.
are arranged in the order of red R, green G, and blue B from the left. Therefore, at the boundary of the images from the three-tube projectors 1 that are adjacent to each other on the left and right, the projection tubes 1 of the same color
There is a difference in distance (optical path length) from a to the screen. 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.

Therefore, the conventional three-tube multi-projector 2
In this case, a difference in color occurs at the boundary between the images from the left and right adjacent sets of 3-tube projectors 1. For example, when all 3-tube projectors 1 project the same image, the color difference between adjacent images There were drawbacks such as creating a sense of incongruity or creating waves of color shading when a single image was projected as a whole.

DISCLOSURE OF THE INVENTION The present invention eliminates the above drawbacks, and
When multiple sets of 3-tube projectors are installed in parallel, each set has three color projection tubes: red, green, and blue.
By arranging a set of three-tube projectors so that the projection tubes of the same color are axisymmetric with respect to each other's boundaries,
An object of the present invention is to provide a three-tube multi-projector that eliminates color steps at image boundaries.

To achieve this objective, the present invention provides red, green,
In a 3-tube multi-projector made up of multiple sets of 3-tube projectors each consisting of one set of projection tubes of three colors of blue, two adjacent sets of 3-tube projectors must have projection tubes of the same color with respect to their boundaries. The gist is that the projection tubes are arranged in line-symmetrical positions.

According to the present invention, a plurality of sets of three-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 sets, so that each three-tube projector projected on the screen is 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 3-tube projector, for example, to eliminate the sense of incongruity between adjacent images when any set of 3-tube projectors project the same image, 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 plan view, and a white balance characteristic diagram of essential parts, respectively, showing an embodiment of the three-tube multi-projector of the present invention.

In Figures 2 and 3, 3-tube multi-projector 11
9 is an inline three-tube projector 1 in which three color projection tubes 1a of red, green, and blue are lined up in a horizontal row.
The projector is constructed by arranging the projector tubes 1a of the adjacent 3-tube projector 1 in a matrix, with 3 sets arranged in three stages, upper, middle, and lower. That is, regarding the four sets of three-tube projectors 1 that are adjacent to each other in the upper, lower, left, and right directions, the projection tubes 1a of the same color are lined up in line symmetry with respect to the boundary line of each set. Therefore, by changing the direction of the three-tube projector 1 located between the left and right in the upper, middle, and lower three stages from the conventional one, from the left in FIG.
The nine projection tubes 1a are arranged in a line in the order of green, red, red, green, blue, blue, green, and red.

Therefore, as shown in FIG. 3, the image boundaries of the three-tube multi-projector 11 adjacent to the left and right are projected by the projection tubes 1a of the same color that are equidistant from each other. Therefore, the conditions are similar to the image boundaries of the three-tube projectors 1 that are vertically adjacent to each other. 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 three-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 three-tube projector 21 used in the three-tube multi-projector 31 shown in FIG. projection tube 1a
Of course, a delta type in which the points are located at each vertex of an equilateral triangle may also be used.

As explained above, according to the three-tube multi-projector 11 having the above-mentioned configuration, two adjacent sets of three-tube projectors 1 have projection tubes of the same color line-symmetrical with respect to each other's boundary line. Therefore, among the images projected by each three-tube projector 1 on the screen 3, the boundaries between adjacent images are projected by the projection tubes 1a of the same color, which are equidistant from each other. As a result, it is possible to eliminate the color difference at the boundary of images produced by adjacent sets of 3-tube projectors 1, which has been a drawback in the past. 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 three-tube multi-projector, respectively, and FIGS. 2 to 4 are a three-tube multi-projector of the present invention, respectively. A front view, a plan 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 three-tube multi-projector of the present invention. 1, 21... 3-tube projector, 1a... projection tube, 11, 31... 3-tube multi-projector.

Claims (1)

[Claims] 1. In a 3-tube multi-projector consisting of multiple sets of 3-tube projectors each consisting of one set of red, green, and blue projection tubes, two adjacent sets of 3-tube projectors are Projection tubes of the same color are arranged in line-symmetrical positions with respect to the boundary line 3
Tube multi projector.