JPH10319500A - Multiscreen projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technique to inconspicuously display joined parts between respective display pictures when the display pictures of plural projection type display devices are synthesized and one display picture is displayed. SOLUTION: A liquid crystal panel 4 is illuminated with nearly parallel beams from a rotary parabolic mirror 2 having a xenon arc lamp 1 at a focus, and the nearly parallel beams are condensed by a condenser lens 3 and are made incident, so that they are displayed as the display picture 6aa on a screen 6 by a projection lens 5. An end part 4a equivalent to the nearly center part of one side of the picture part of the liquid crystal panel 4 is arranged in the vicinity of the optical axis L0 of the projection lens 5 and a part equivalent to the end part 4a is displayed at the nearly center part 6c of the screen 6. Another similar projection display device (not shown in a figure) is arranged by the side of a display device, and similar projection is executed on the screen 6 so as to obtain the display picture 6ab. Thus, respective display pictures 6aa and 6ab are synthesized on the screen 6 and a whole display picture 6a is displayed by using two projection type display devices.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen projection type display device for displaying a television picture or the like on a large screen and with inconspicuous screen joints.

[0002]

2. Description of the Related Art As a device for displaying a television image or the like on a large screen, a projection display device using a liquid crystal or the like as an image forming element is used. There is a multi-screen projection display device that uses a plurality of projection display devices to project and combine and display the same on a single screen in order to display a larger screen. FIG.
FIG. 1 is a schematic diagram of (A) a display screen at the time of normal display, (B) a display screen at the time of reduced display, and (C) a display screen at the time of enlarged display of a conventional multi-screen display device using two projection display devices. is there.
A large screen is displayed by projecting each projection screen onto one screen and synthesizing each of the display screens 51aa, 51ab, 51ac, 51ad to form the entire display screen 51a. However, in such a multi-screen projection display device,
Generally, each display screen 51aa, 51ab,
The central portions of 51ac and 51ad are displayed bright, and the peripheral portions are displayed dark. Therefore, as the entire display screen 51a,
The central part becomes dark, and each display screen 51aa, 51ab, 51
The joint between ac and 51ad becomes conspicuous, and there is a problem of deteriorating the display quality. Further, when a zoom lens is used as the projection lens, and when the display screens 51ba, 51bb, 51bc, 51bd are reduced and displayed by zooming back, there is a gap between the respective display screens of the entire display screen 51b. And each display screen 51bc
When a, 51cb, 51cc, and 51cd are displayed in an enlarged manner, the respective display screens of the entire display screen 51c overlap with each other, so that the projection position from each display device must be readjusted each time. There was also a problem.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and when displaying one display screen by synthesizing display screens of a plurality of projection-type display devices, the present invention provides It is an object of the present invention to provide a technique for displaying joints inconspicuously.

[0004]

Means for Solving the Problems Each of the display screens projected on one screen by using a plurality of projection type display devices for enlarging and projecting an image created by an image forming element such as a liquid crystal panel with a projection lens and displaying the image is displayed. In a multi-screen projection display device that performs large-screen display by combining images, an end of an image of the image forming element is disposed substantially on an optical axis of the projection lens, and a portion corresponding to the same end of each display screen is provided. Is displayed substantially at the center of the screen so that the substantially center of the optical axis is located at the center of the combined display screen, and the joints of the respective display screens are made inconspicuous.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality of display screens projected on one screen are synthesized by using a plurality of projection type display devices for displaying an image created by an image forming element such as a liquid crystal panel by enlarging and projecting with a projection lens. In a multi-screen projection display device that performs a large screen display, an end of the image of the image forming element is disposed substantially on the optical axis of the projection lens, and a portion corresponding to the same end of each of the display screens is formed. It is displayed almost at the center of the screen.

The projection lens is a zoom lens that enlarges or reduces a display screen without changing the projection position of the projection display device.

The number of the projection display devices is two, and the center of one side of the image of the image forming element is disposed substantially on the optical axis of the projection lens.

The number of the projection type display devices is four, and one corner of the image of the image forming element is arranged substantially on the optical axis of the projection lens.

A substantially roof-type reflecting mirror is arranged on an optical path in front of a projection lens of the projection display device, and the projection light of one projection display device is reflected by one mirror surface of the reflection mirror, and the other is reflected. The projection light of the projection display device is reflected by another mirror surface of the reflecting mirror, and is synthesized on the screen to perform display.

A substantially quadrangular pyramid-type reflecting mirror is disposed on an optical path in front of a projection lens of the projection display device, and the projection light from each projection display device is reflected by one mirror surface of the reflection mirror. Combine and display on the screen.

A condenser lens for condensing a light beam from the element to the projection lens is disposed near the image forming element. The condenser lens has its center aligned with the optical axis and has an outer shape perpendicular to the optical axis. Is made substantially equal to the outer shape of the image forming element.

[0012]

1 is a plan view showing a concept of one projection type display device showing the concept of one embodiment of a multi-screen display device according to the present invention. FIG. Figure,
(C) It is a front view of a display screen. A xenon arc lamp 1, a paraboloid of revolution 2, a condenser lens 3, a liquid crystal panel 4, a projection lens 5 and the like constitute one projection display device 10. A liquid crystal panel 4 as an image forming element is illuminated by a substantially parallel light from a rotating parabolic mirror 2 having a substantially point light source made of a xenon arc lamp 1 and the like focused on the liquid crystal panel 4 and directed to a projection lens 5 by a condenser lens 3. An image formed on the liquid crystal panel by forming an image on the screen 6 by the projection lens 5 is displayed as a display screen 6aa. An end portion 4 corresponding to a substantially central portion of one side of an image portion of the liquid crystal panel 4
a is arranged near the optical axis L0 of the projection lens 5 and a portion corresponding to the end 4a is displayed on a substantially central portion 6c of the screen 6. Another similar projection-type display device (not shown) is arranged beside the above-mentioned display device and similarly projected on the screen 6 to form a display screen 6ab. In this way, using the two projection display devices, the respective display screens 6aa, 6ab
Are combined on the screen 6 to display the entire display screen 6a.

FIG. 2 shows the concept of another embodiment of a multi-screen display device according to the present invention.
(B) The same top view, (C) It is a front view of a display screen. Liquid crystal panel 3 as an image forming element of one projection display device
The one corner 34a of the image portion of No. 4 is arranged near the optical axis L30 of the projection lens to obtain a display image 26aa on the screen. A portion corresponding to one corner 34a of the image portion of the liquid crystal panel 34 is projected onto a substantially central portion 26c of the screen. Four similar display devices are arranged vertically and horizontally, projected on the same screen, and their display screens 26aa, 26ab, 26a
c and 26ad are combined to obtain the entire display screen 26a.
The condenser lens 33 that condenses the light beam illuminating the liquid crystal panel 34 toward the projection lens has an optical axis L30
, The outer shape in the direction perpendicular to the optical axis is set to an outer shape 33a substantially equal to the liquid crystal panel 34. As a zoom lens for displaying the projection lens of each projection display device by enlarging or reducing the display screen, each display screen 26b reduced by zoom back
a, 26bb, 26bc, and 26bd can be combined and displayed as the entire display screen 26b reduced around the substantially central portion 26c of the screen. Similarly, when the image is enlarged and displayed by zooming in, the central portion 26c of the screen is displayed.
Can be enlarged and displayed around the center.

FIG. 3 is a plan view showing the concept of another embodiment of the multi-screen display device according to the present invention. On the optical path in front of the projection lenses 5a and 5b of the two projection display devices 10a and 10b, a substantially roof-shaped reflecting mirror 41 is arranged. The projection light L40a of one projection display device 10a is reflected by one mirror surface 41a of the reflector 41, and the other projection display device 10b
Is reflected by the other mirror surface 41b of the reflecting mirror 41, and is combined as projection light L41-L41 on a screen (not shown) to perform display such as the display screen 6a. Here, the projection lights L40a and L40b from the projection display devices 10a and 10b are once reflected by the mirrors 42a and 42b and made incident on the reflection mirror 41, but the directions of the projection display devices 10a and 10b are changed. The light can be directly incident on the reflecting mirror 41.

Similarly to the above, four projection display devices are arranged vertically and horizontally, and a substantially quadrangular pyramid-type reflecting mirror is arranged on the optical path in front of the projection lens. Can be reflected on each of the four mirror surfaces of the substantially quadrangular pyramid-type reflecting mirror and combined on a screen to perform display such as the display screen 26a described above.

[0016]

The present invention is embodied in the form described above, and has the following effects.

Using a plurality of projection display devices, which enlarge and project an image created by an image forming element such as a liquid crystal panel with a projection lens and display the images, combine the respective display screens projected on one screen to display a large screen. In the multi-screen projection display device, the end of the image of the image forming element is disposed substantially on the optical axis of the projection lens, and a portion corresponding to the same end of each of the display screens is substantially centered on the screen. The center of each display screen is displayed bright by making the approximate center of the optical axis come to the center of the combined display screen, and the joints of each display screen are made inconspicuous. Can be.

[0018] The projection lens is a zoom lens that zooms in or zooms out a display screen without changing the projection position of the projection type display device. Can also be displayed without the display screens being separated from each other or overlapping, eliminating the need to readjust the display position from each projection display device.

The number of the projection display devices is two, and the central portion of one side of the image of the image forming element is disposed substantially on the optical axis of the projection lens, so that each display screen composed of two screens is provided. The joint can be displayed smoothly.

The number of the projection type display devices is four, and one corner of the image of the image forming element is arranged substantially on the optical axis of the projection lens, so that the joint between the four display screens is made smooth. Can be displayed.

A substantially roof-type reflecting mirror is arranged on an optical path in front of a projection lens of the projection display device, and the projection light of one projection display device is reflected by one mirror surface of the reflection mirror, and the other is reflected. By reflecting the projection light of the projection display device on the other mirror surface of the reflecting mirror and synthesizing and displaying on the screen, geometric distortion of each display screen projected from the two projection display devices can be minimized. can do.

An approximately quadrangular pyramid-type reflecting mirror is arranged on the optical path in front of the projection lens of the projection display device, and the projection light from each projection display device is reflected by one mirror surface of the reflection mirror. By combining and displaying on the screen, the geometric distortion of each display screen projected from the four projection display devices can be minimized. .

A condenser lens for condensing light rays from the image forming element on the projection lens is disposed near the image forming element. The condenser lens has its center aligned with the optical axis and has an outer shape perpendicular to the optical axis. The size of the condenser lens can be reduced by making it substantially equal to the outer shape of the image forming element.

[Brief description of the drawings]

FIG. 1 is a plan view showing a concept of one projection type display device showing a concept of an embodiment of a multi-screen display device according to the present invention. FIG. Figure,
(C) It is a front view of a display screen.

2A is a front view of a liquid crystal panel, FIG. 2B is a plan view of the same, and FIG. 2C is a front view of a display screen, showing the concept of another embodiment of the multi-screen display device according to the present invention.

FIG. 3 is a plan view showing the concept of another embodiment of the multi-screen display device according to the present invention.

FIG. 4 shows (A) a display screen at the time of normal display, (B) a display screen at the time of reduced display, and (C) a display screen at the time of enlarged display of a conventional multi-screen display device using four projection display devices. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Xenon arc lamp 2 Rotating parabolic mirror 3 Condenser lens 4 Liquid crystal panel 5, 5a, 5b Projection lens 6 Screen 10, 10a, 10b Projection display device L0 Optical axis of projection lens 6a Display screen 33 Condenser lens 34 Liquid crystal panel L30 Optical axis of projection lens 26a Display screen 41 Roof-type reflector 42a, 42b Mirror L41 Projection light 51a, 51b, 51c Display image

Claims (7)

[Claims] An image created by an image forming element such as a liquid crystal panel is projected and enlarged on a single screen by using a plurality of projection type display devices for projecting an image by a projection lens. In a multi-screen projection display device that performs screen display, an end of the image of the image forming element is disposed substantially on the optical axis of the projection lens, and a portion corresponding to the same end of each display screen is formed on the screen. A multi-screen projection display device characterized by being displayed substantially at the center. 2. The zoom lens according to claim 1, wherein the projection lens is a zoom lens that enlarges or reduces a display screen without changing a projection position of the projection display device.
The multi-screen projection display device as described in the above. 3. The multiple display device according to claim 1, wherein the number of the projection display devices is two, and a central portion of one side of an image of the image forming element is disposed substantially on an optical axis of the projection lens. Screen projection display device. 4. The multi-screen projection type display according to claim 1, wherein the number of the projection type display devices is four, and one corner of the image of the image forming element is disposed substantially on the optical axis of the projection lens. Display device. 5. A substantially roof-type reflecting mirror is disposed on an optical path in front of a projection lens of the projection display device, and a projection light of one projection display device is reflected by one mirror surface of the reflection mirror,
4. The multi-screen projection display device according to claim 3, wherein the projection light of the other projection display device is reflected by another mirror surface of the reflection mirror, and is synthesized and displayed on the screen. 6. A substantially quadrangular pyramid-type reflecting mirror is arranged on an optical path in front of a projection lens of the projection display device, and the projection light from each projection display device is reflected by one mirror surface of the reflection mirror. 5. The multi-screen projection display device according to claim 4, wherein display is performed by combining the images on the screen. 7. A condenser lens for converging light rays from the image forming element to the projection lens near the image forming element, the condenser lens having its center aligned with the optical axis, and having a direction perpendicular to the optical axis. 5. The multi-screen projection display device according to claim 3, wherein an outer shape of the image forming element is substantially equal to an outer shape of the image forming element.