KR20040077131A - Multi-projection type image displayer - Google Patents

Abstract

PURPOSE: A multi-projection type image display device is provided to create a multi-screen image in various directions by using one projector. CONSTITUTION: A multi-projection type image display device includes a display device body(102), a projector(104), a beam splitter(106) and three projection screens(108a,108b,108c). The projector(104) is installed in the display device body(102) and includes a plurality of signal processors for processing image signals and an optical system for converting the processed image signal into an image beam, which is projected to each of the three projection screens(108a,108b,108c). The beam splitter(106) splits the image beams into red, green and blue beams according to wavelengths thereof.

Description

Multi-projection image display device {MULTI-PROJECTION TYPE IMAGE DISPLAYER}

The present invention relates to a projection type image display device, and more particularly, to a multi-projection type image display device suitable for displaying an image by projecting a beam from the rear side of a projection screen using a projector.

Recently, the expansion of projection type image display devices that display a target image on a projection screen by projecting an image beam for an image through a projector to the rear side of the projection screen (the side opposite to the viewing side of the image) has been expanded. Such a projection image display device is widely used as a television for broadcasting a broadcast signal, an outdoor display board, and the like.

3 is a schematic structural diagram showing a conventional projection type image display device, which includes a display body 302, a projector 304, and a projection screen 306. As shown in FIG.

Referring to FIG. 3, the projector 304 includes a plurality of signal processing processors for processing an image signal therein and an optical system for projecting the signal processed image signal as an image beam. The image beam is projected in the rearward direction (direction A) of the projection screen 306.

In addition, although not shown in the drawings, a lenticular lens is formed on the viewing surface of the projection screen 306, and the image beam projected to the rear surface of the projection screen 306 is dispersed through the lenticular lens. In addition, viewers will be able to watch the screen image in the viewing range.

Therefore, in the conventional projection type image display device having the above structure, viewers watch a screen image (for example, a broadcast image, an advertisement image, etc.) displayed through a projection screen, that is, use one projector and a screen. I could watch a single screen image.

Recently, there are frequent cases where the projection image display device is used indoors (for example, exhibition halls, etc.) and / or outdoor billboards, and a plurality of projection image display devices are installed in a specific area depending on the need or purpose. There must be a case. For example, when it is necessary to be able to see the billboards in all three directions from where there are lengths in three directions, according to the conventional method, the projection type image display apparatus has to be provided in each of the three directions.

Therefore, when using a conventional projection type image display apparatus to provide a screen image in multiple directions at the same place, there is a problem that the cost is excessive because it is necessary to install as many projectors as desired directions. Since it occupies as much installation space, there is a problem that the utilization of the space around the image display device is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-projection type image display apparatus capable of generating a multi-screen image that can be projected in different directions using a single projector.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a projection type image display apparatus for displaying a screen image by projecting an image beam from a projector onto a screen, the projector comprising: projecting a predetermined image beam; A beam splitter for splitting and reflecting the projected image beam for each wavelength band to generate a plurality of split image beams traveling at different angles; And a plurality of projection screens each receiving the generated separate image beams and displaying a plurality of screen images corresponding to the images of the projection image beams, respectively.

1 is a schematic structural diagram of a multi-projection image display device according to an embodiment of the present invention;

2 is a schematic structural diagram of a multi-projection image display device according to another embodiment of the present invention;

3 is a schematic structural diagram showing a conventional projection type image display apparatus;

<Explanation of symbols for the main parts of the drawings>

102, 202: display body 104, 204: projector

106,206: beam splitter 106a, 106b, 206a, 206b: prism or mirror

108a-108c, 208a-208c: projection screen

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A key technical aspect of the present invention is that, unlike the aforementioned conventional method of providing only one screen image using one projector and a projection screen, a plurality of projection screens in which one projector and a viewing surface are arranged in different directions are provided. And X-Prism, X-Dichroic Mirror, etc. separates and reflects the image beam projected from one projector for each wavelength band and projects it to each projection screen As a result, it is possible to provide a plurality of screen images (multi-screen images) having different directions, and it is easy to achieve the object of the present invention through such technical means.

Example 1

1 is a schematic structural diagram of a multi-projection image display device according to an embodiment of the present invention, which includes a display body 102, a projector 104, a beam splitter 106, and three projection screens 108a, 108b, and 108c. It includes.

Referring to FIG. 1, a projector 104 located in a display body 102 includes a plurality of signal processing processors for processing an image signal therein, an optical system for projecting a signal processed image signal as an image beam, and the like. Including, to project the image beam to be provided to each projection screen (108a, 108b, 108c) through the optical system.

Next, the beam splitter 106 is, for example, an X-Prism, an X-Dichroic Mirror, or the like, and the image beams projected from the projector 104 are transferred. The light is separated by wavelength, for example, red (R), green (G), and blue (B), respectively, and reflected at a predetermined angle.

More specifically, the two X-shaped prisms or mirrors 106a and 106b constituting the beam splitter 106 transmit all of the image beams of the red wavelength band (arrow B direction), and the prism or mirror 106a in one direction. ) Reflects only the image beam in the red (R) wavelength range by 90 degrees (arrow A direction), and the prism or mirror 106b in the other direction reflects only the image beam in the blue (B) wavelength band by 90 degrees (arrow C) Direction).

That is, the image beams projected from the projector 104 are divided into image beams of the R, G, and B wavelength bands through the transmission and reflection functions of the beam splitter 106, respectively, in opposite directions when viewed from the image beams of the G wavelength band. Reflected at an angle of 90 degrees.

Therefore, the image beam of the red (R) wavelength band reflected and traveling in the direction of arrow A is projected to the rear side of the projection screen 108a, so that the screen image having a red color overall on the projection screen 108a is viewed from the viewing surface (i.e. The image beam of the green (G) wavelength band, which is displayed on the opposite side of the rear surface and is transmitted and travels in the direction of the arrow B, is projected to the rear side of the projection screen 108b, so that the overall color of the green is projected on the projection screen 108b. A prominent screen image is displayed on the viewing side (i.e., the reverse side of the rear side), and the image beam of the blue (B) wavelength band reflected and traveling in the direction of arrow C is projected to the rear side of the projection screen 108c, thereby projecting the screen 108c. ) Displays an overall blue color screen image on the viewing side (i.e., the reverse side of the back side).

As a result, on each projection screen 108a, 108b, 108c, the screen images with different colors for the same image are displayed at the same time so that the viewers in the three directions are each projected in their own visual directions. Through the screen, it is possible to simultaneously view the same screen image (multi-screen image having different directions).

Therefore, according to the multi-projection type image display device of the present embodiment, the same screen image (multi-screen) in different directions is obtained by separating and reflecting an image beam projected through one projector for each wavelength band and inducing a projection screen in different directions. Since multiple images can be displayed simultaneously, a multi-screen image having different orientations can be realized at a low installation cost, and an image display apparatus can be realized by using only one projector to implement multi-screen images having different orientations. It is possible to reduce the occupied area for the installation of the can enhance the space utilization around the image display device.

Example 2

2 is a schematic structural diagram of a multi-projection image display device according to another embodiment of the present invention.

2, in view of the multi-projection image display apparatus of the present embodiment, the display apparatus body 202, the projector 204, the beam splitter 206, and three projection screens 208a, 208b, and 208c are provided. This is substantially the same as the image display device in the first embodiment described above.

The difference in the reflection angles of the two X-shaped prisms or mirrors 206a and 206b constituting the beam splitter 206 is different from each other. This is not to install at an angle, but to allow the angle between projection screens to be wider or narrower than 90 degrees if necessary.

Therefore, the multi-projection type image display device according to the present embodiment not only obtains the same result (effect) as in the above-described embodiment, but also makes it possible to flexibly cope with the installation adaptability by allowing the angle between the projection screens to be adjusted. Has more advantages.

Meanwhile, in the present exemplary embodiments, the image beams projected from the projector are separated into image beams of R, G, and B wavelengths using a beam splitter, but the present invention is not limited thereto. By coating a thin film material having any color on each of the prisms or mirrors, the color of the screen image displayed through the projection screen 108a and the projection screen 108c may be changed.

In addition, the projection screen 108a in such a way that one prism or mirror reflects the image beam in the R and G wavelength bands, and the other prism or mirror reflects the image beam in the B and G wavelength bands. Of course, it is possible to change the color of the screen image displayed through the and projection screen 108c, respectively.

Furthermore, the present invention employs a half-mirror and two projection screens instead of an X-prism or X-dichroic mirror as a beam splitter, so that two screen images having different orientations can be displayed. In addition, by coating a thin film material having an arbitrary color on the reflective surface of the half mirror, the color of the separated screen image displayed through the projection screen may be changed.

On the other hand, the present embodiment has been described using a rear projection image display device as an example, but the present invention is not necessarily limited thereto, and a person skilled in the art may apply the multi-projection image display device of the present invention to a front projection type. You can easily understand that.

In the foregoing description, the present invention has been described with reference to preferred embodiments, but the present invention is not necessarily limited thereto. Those skilled in the art will appreciate that the present invention may be modified without departing from the spirit of the present invention. It will be readily appreciated that branch substitutions, modifications and variations are possible.

As described above, according to the present invention, unlike the aforementioned conventional method of providing only one screen image by using one projector and a projection screen, the image beam projected through one projector is separated and reflected for each wavelength band. By providing the same screen image (multi-screen image) in multiple directions at the same time by leading to projection screens of different directions, it is possible to realize a multi-screen image having different orientations at a low installation cost, Since a multi-screen image having different orientations is implemented using only one projector, the occupancy area for installing the image display device can be reduced, and thus the space utilization around the image display device can be improved.

Claims (7)

A projection type image display device for displaying a screen image by projecting an image beam from a projector onto a screen, The projector projecting a predetermined image beam; A beam splitter for splitting and reflecting the projected image beam for each wavelength band to generate a plurality of split image beams traveling at different angles; And And a plurality of projection screens each receiving the generated separate image beams and displaying a plurality of screen images corresponding to the images of the projection image beams, respectively. The X-Prism or X-Dichroic mirror (X) according to claim 1, wherein the beam splitter transmits and reflects the projected image beam to generate three separate image beams having different directions. -Dichroic Mirror). 3. The multi-projection image of claim 2, wherein each of the reflective surfaces of the X-prism or X-dichroic mirror is formed with a coating material for changing the color of the corresponding split image beam, respectively. Display. 3. The reflection surface of the X-prism or X-dichroic mirror transmits an image beam in the G wavelength band, one reflection surface reflects the image beam in the R wavelength band, and the other reflection surface is in the B wavelength band. A multi-projection image display device, characterized in that for reflecting the image beam. 3. The reflective surface of claim 2, wherein each of the reflective surfaces of the X-prism or X-dichroic mirror transmits an image beam in the G wavelength band, one of the reflective surfaces reflects the image beam in the R and G wavelength bands, and the other of the reflective surfaces A multi-projection image display device which reflects an image beam in the B and G wavelength bands. The multi-projection image display apparatus of claim 1, wherein the beam splitter is a half mirror that transmits and reflects the projection image beam to generate two separate image beams having different directions. 7. The multi-projection image display apparatus according to claim 6, wherein the reflective surface of the half mirror is formed with a coating material for changing the color of the reflected split image beam.