JP3876517B2 - Rear projection multi-vision display device - Google Patents

Description

表１において、○は実用上問題なしとの判定を示し、×は実用上問題ありとの判定を示す。
【００３８】
【発明の効果】
以上説明したように、本発明によれば、スクリーン面の法線方向に対して第１の反射体がなす第１の角度と第２の反射体がなす第２の角度とを所定の範囲内とし且つ所定の関係に維持するようにしたことで、装置の薄型化効果と高さ低減効果とを実現して装置寸法を小さくしながら、各単位スクリーン部分に形成される分割画像の画質を良好に維持し、これら分割画像の間の画質のばらつきを小さくして画面全体として画質の均一性の向上させることの可能な背面投写型マルチビジョンディスプレイ装置を提供することができる。
【図面の簡単な説明】
【図１】本発明による背面投写型マルチビジョンディスプレイ装置の一実施形態を示す部分断面概略図である。
【図２】本発明による背面投写型マルチビジョンディスプレイ装置の一実施形態を示す正面概略図である。
【図３】本発明による背面投写型マルチビジョンディスプレイ装置の一実施形態を示す平面概略図である。
【図４】反射体の具体例を示す切断斜視図である。
【符号の説明】
２ スクリーン面
２Ａ，２Ｂ，２Ｃ，２Ｄ 単位スクリーン部分
４ 外枠部材
６ 装置フレーム
８ キャスタ
１０ レベル調整部材
１２Ａ，１２Ｂ プロジェクタ
１４Ａ，１４Ｂ 反射体
１６Ａ，１６Ｂ 投写ユニット
２２ 反射フィルム
２４ 保持枠
２６ 保護部材[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of image display, and particularly relates to a rear projection type multi-vision display device.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, in order to perform a large screen display, the screen is divided into a plurality of sections, and necessary image light is projected from independent projectors on the back of each divided screen, and one image is displayed as the entire screen. An apparatus for observing the screen from the front side has been proposed. Such a device for displaying a large screen is often called a rear projection type multi-vision display device.
[0003]
That is, in the rear projection type multi-vision display device, a plurality of unit screen portions are arranged on a single plane, and constitute a screen surface (screen) as a whole. For example, in the case of a screen having a spread in the vertical direction and the horizontal direction, a plurality of unit screen portions are arranged in the vertical direction, and a plurality of unit screen portions are also arranged in the horizontal direction.
[0004]
By the way, in the rear projection type multi-vision display device, if the projector is arranged directly behind the corresponding unit screen portion so that the optical axis of the projector is substantially orthogonal to the screen surface, the device is made thinner (reduction in depth dimension). ) Is difficult. Therefore, in order to meet the demand for thinning the device, the light projected from each projector is reflected by the corresponding flat reflector (mirror) and the optical path is bent, and then the unit screen portion corresponding to it. Projecting.
[0005]
When arranging a plurality of projection units having such projectors and mirrors, the projector of a certain projection unit is arranged between the mirrors of the projection unit and the mirrors of the adjacent projection units. The thickness (particularly the dimension in the direction perpendicular to the thickness direction [for example, the vertical direction]) has been reduced (Japanese Patent Laid-Open Nos. 5-300458 and 2-278976).
[0006]
In JP-A-5-300458, when the projection units are arranged in two upper and lower stages, the angle formed by the mirror of the lower projection unit with the horizontal plane is made larger than the angle formed by the mirror of the upper projection unit with the horizontal plane. It is disclosed. Similarly, Japanese Laid-Open Patent Publication No. 2-278976 discloses that when the projection units are arranged in a plurality of upper and lower stages, the mirror setting angle (angle formed in the vertical direction) is increased as the projection unit is arranged on the upper side. Has been. According to these publications, what is cited as the significance of adopting the mirror arrangement as described above is that the arrangement of the projector is made more efficient and the space utilization efficiency is improved, so that the effect of thinning the apparatus by adopting the mirror is achieved. At the same time, an effect of reducing the height of the apparatus is realized, and the apparatus size is reduced. These publications describe the magnitude relationship between mirror tilts in adjacent projection units, but do not describe specific numerical values of mirror tilt angles between adjacent projection units.
[0007]
On the other hand, in a rear projection type multi-vision display device, for example, a projector using a CRT (cathode ray tube), a liquid crystal panel or a mirror panel is used, but the pixels of these projectors are gradually miniaturized due to the demand for higher image quality. In addition, the enlargement magnification of each divided image projected from each projector onto the unit screen portion is gradually increased due to the demand for a larger screen.
[0008]
Under such circumstances, variations in image quality between divided images formed on each unit screen by each projection unit are very conspicuous. There is a demand for display with good image quality uniformity.
[0009]
Accordingly, the present invention provides a rear projection multivision display device that includes a projector and a mirror in each of the projection units as described above, thereby improving the efficiency of space-saving and improving the thinning effect of the device by improving the layout of the projector and increasing the space utilization efficiency. It is possible to improve the uniformity of the image quality of the entire screen by reducing the size of the apparatus by realizing the effect of reducing the size and reducing the variation in image quality between the divided images formed on each unit screen portion. An object of the present invention is to provide a rear projection type multi-vision display device.
[0010]
[Means for Solving the Problems]
According to the present invention, the object as described above is achieved.
A first unit screen portion and a second unit screen portion are disposed adjacent to each other in a first direction, and one screen surface includes the first unit screen portion and the second unit screen portion. A first projector for projecting the first image light from the back side of the screen surface to the first unit screen portion, and the first image light from the first projector. A first projection unit including a first reflector that reflects toward the first unit screen portion; and a second image from the back side of the screen surface with respect to the second unit screen portion. A second projector for projecting light, and a second reflector for reflecting the second image light from the second projector toward the second unit screen portion. A rear projection type multi-vision display device having a projection unit,
The first projector is disposed on the second reflector side with respect to the first reflector, and the second projector is opposite to the first reflector with respect to the second reflector. The first reflector made by the first reflector with respect to the normal direction of the screen surface is 45 degrees, and the second reflection with respect to the normal direction of the screen surface body is a second angle 55 degrees form the first angle rather than 10 degrees smaller the second angle,
Each of the first projector and the second projector is a cathode ray tube, a liquid crystal panel, or a mirror panel, and the horizontal and vertical dimensions of the pixels on the screen surface are 1.5 mm or less. A rear projection type multi-vision display device is provided.
[0011]
In one aspect of the present invention, a set of the first unit screen portion and the first projection unit in a second direction perpendicular to both the first direction and the normal direction of the screen surface; A second configuration equivalent to the first configuration is arranged adjacent to the first configuration including two sets of the second unit screen portion and the second projection unit.
[0012]
In one aspect of the present invention, the first direction is a vertical direction, and the normal direction of the screen surface is a horizontal direction.
[0013]
In one aspect of the present invention, the direction of the optical axis of the first projector is substantially vertical within a cross section including both the first direction and the normal direction of the screen surface.
[0014]
In one aspect of the present invention, each of the first reflector and the second reflector is formed by holding a film having a reflective layer in a planar shape by applying a tensile force.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a partial sectional schematic view showing an embodiment of a rear projection type multivision display device according to the present invention, FIG. 2 is a schematic front view thereof, and FIG. 3 is a schematic plan view thereof.
[0018]
In these drawings, reference numeral 2 denotes a screen surface, which is composed of four unit screen portions 2A, 2B, 2C, and 2D. These unit screen portions 2A, 2B, 2C, and 2D are composed of, for example, a lenticular lens sheet disposed on the front side and a circular Fresnel lens sheet disposed on the back side.
[0019]
The screen surface 2 is attached to the outer frame member 4, and the outer frame member 4 is attached to the apparatus frame 6. The apparatus frame 6 is placed on the floor surface 12 via a caster 8 and a level adjusting member 10, and can be moved by applying the caster 8. A predetermined level can be obtained by applying the level adjusting member 10. It is possible to fix in the posture.
[0020]
Projection units corresponding to the unit screen portions 2A, 2B, 2C, and 2D are attached to the frame 6.
[0021]
As shown in FIG. 1, corresponding to the unit screen portion 2A (corresponding to the first unit screen portion referred to in the present invention), it includes a first projector 12A and a first reflector 14A. A first projection unit 16A is arranged. A second projection unit 16B including a second projector 12B and a second reflector 14B is disposed corresponding to the unit screen portion 2B (corresponding to the second unit screen portion in the present invention). Has been. Examples of the first projector 12A and the second projector 12B include those using a cathode ray tube, a liquid crystal panel, or a mirror panel. A mirror panel is a panel which controls each pixel which comprises a screen by operation | movement of a mirror like DMD (digital micromirror device) system.
[0022]
In the present embodiment, the first unit screen portion 2A and the second unit screen portion 2B are arranged adjacent to each other in the vertical direction, that is, the first direction is the vertical direction, and the normal line of the screen surface 2 is present. The direction is horizontal.
[0023]
The first reflector 14A reflects the first image light emitted from the first projector 12A toward the first unit screen portion 2A. The second reflector 14B reflects the second image light emitted from the second projector 12B toward the second unit screen portion 2B. In FIG. 1, reference numeral 12A ′ indicates an image of the first projector 12A by the first reflector 14A, and reference numeral 12B ′ indicates an image of the second projector 12B by the second reflector 14B. The direction of the optical axis of the first projector image 12A ′ and the direction of the optical axis of the second projector image 12B ′ are both horizontal.
[0024]
As shown, the first projector 12A is disposed on the second reflector 14B side with respect to the first reflector 14A (in particular, the first reflector 14A and the second reflector 14B). The second projector 12B is disposed on the side opposite to the first reflector 14A with respect to the second reflector 14B.
[0025]
The first reflector 14A is at a first angle θ ₁ with respect to the normal direction (horizontal direction) of the screen surface 2, and the second reflector 14B is normal to the screen surface 2 (horizontal direction). Direction) to a second angle θ ₂ . Here, the first angle θ ₁ is 40 to 55 degrees, and the second angle θ ₂ is 45 to 60 degrees. Moreover, the first angle θ ₁ is 5 to 15 degrees smaller than the second angle θ ₂ . By adopting such a range of the first angle θ ₁ and the second angle θ ₂ , the effect of reducing the depth of the apparatus (dimension in the screen surface normal direction) and the first projector 12A as the second In addition to obtaining both the effect of reducing the height of the apparatus by being arranged close to the second reflector 14B in the space on the back side of the reflector 14B, the first unit screen portion The image quality between the first image projected and formed on 2A and the second image projected and formed on the second unit screen portion 2B is comprehensive depending on the size of resolution, distortion, blur, color unevenness, etc. (This can be determined by human vision).
[0026]
If the first angle θ ₁ or the second angle θ ₂ becomes too small, the depth of the apparatus tends to increase due to the projector arrangement, and the image quality tends to deteriorate, whereas the first angle θ ₁ or If the second angle θ ₂ becomes too large, the depth of the apparatus tends to increase or the height tends to increase due to the projector arrangement, and the image quality tends to deteriorate. When the first angle θ ₁ is smaller than the second angle θ ₂ by less than 5 degrees, the first projector 12A is placed in the space on the back side of the second reflector 14B. When the first angle θ ₁ becomes smaller than the second angle θ _{2 by} more than 15 degrees because the effect of reducing the height of the apparatus due to the arrangement close to 14B becomes insufficient, the first unit screen The difference in image quality between the image formed in the portion 2A and the image formed in the second unit screen portion 2B tends to be large.
[0027]
The above effects become remarkable when the horizontal and vertical dimensions of the pixel on the screen surface are 1.5 mm or less (for example, high vision, SVGA, XGA, and SXGA).
[0028]
As shown in FIG. 3, the first projector 12A (the image 12A ′ of which is shown in FIG. 3) includes a first primary color tube 12A-1, a second primary color tube 12A-2, and It is possible to use a tube composed of three tubes of the third primary color tube 12A-3 (the images 12A′-1, 12A′-2 and 12A′-3 are shown in FIG. 3). In this case, the optical axis of the first projector 12A is not strictly one, but can be represented by the optical axis of the central primary color tube 12A-2. Further, when viewed in the cross section of FIG. 1, the direction of the optical axis of the projector 12A is one.
[0029]
FIG. 3 also shows a projector 12D (its image 12D ′ is shown in FIG. 3) and reflector 14D corresponding to the unit screen portion 2D shown in FIG. In FIG. 3, the projector 12D has three tubes of a first primary color tube 12D-1, a second primary color tube 12D-2, and a third primary color tube 12D-3 (FIG. 3 shows their images 12D′-1, 12D'-2 and 12D'-3 are shown).
[0030]
In the present embodiment, the first unit screen is composed of two sets: a set of the first unit screen portion 2A and the first projection unit 16A and a set of the second unit screen portion 2B and the second projection unit 16B. Is equivalent to the second configuration including two sets of the unit screen portion 2C and the corresponding projection unit and the unit screen portion 2D and the corresponding projection unit (including the projector 12D and the reflector 14D). It is. The first configuration and the second configuration are adjacently arranged in a second direction orthogonal to both the first direction (vertical direction) and the normal direction of the screen surface.
[0031]
FIG. 4 is a cut perspective view showing a specific example of the first reflector and the second reflector. In this example, the reflector is attached by holding a film 22 having a reflective layer (for example, silver-deposited polyester film having a thickness of about 100 to 200 μm) 22 in a planar state with a tensile force applied to the holding frame 24. It will be. Thereby, good flatness can be easily obtained. Reference numeral 26 denotes a protective member made of expanded polystyrene disposed on the back side of the film 22.
[0032]
By using such a reflector, the cost can be easily reduced, but the flatness may be slightly lowered due to the change with time. However, even in this case, according to the present invention, it is possible to minimize image quality degradation and image quality variation between unit screen portions.
[0033]
In the above embodiment, the first direction is the up-down direction, the second direction is the horizontal direction, and the normal direction of the screen surface is the horizontal direction. However, the present invention is not limited to this. For example, the first direction can be the horizontal direction, the second direction can be the vertical direction, and the normal direction of the screen surface can be the horizontal direction.
[0034]
Examples and comparative examples In the rear projection type multi-vision display device shown in Figs. 1 to 3, the first angle? ₁ and the second angle? ₂ are changed to change the depth of each device and each unit. The image quality of the screen portion and the image quality variation (image quality difference) of the unit screen portion were examined.
[0035]
The size of the unit screen part is 1016 mm in the horizontal direction (horizontal direction) and 810 mm in the vertical direction (vertical direction). A rear projection type multi-vision display device having a screen surface arranged in stages and having a screen surface of a four-plane configuration with a horizontal (horizontal) length of 2032 mm and a vertical (vertical) length of 1620 mm. The magnification of each projector was set to 7.5 times. On each unit screen portion, the number of pixels is 800 × 600, and the size of each pixel is 1.27 mm and 1.35 mm (RGB personal computer SVGA). The distance from the screen surface to the observer was 2430 mm.
[0036]
The results are shown in Table 1 below:
[0037]
[Table 1]

In Table 1, ◯ indicates that there is no practical problem, and × indicates that there is a practical problem.
[0038]
【The invention's effect】
As described above, according to the present invention, the first angle formed by the first reflector and the second angle formed by the second reflector with respect to the normal direction of the screen surface are within a predetermined range. And maintaining the predetermined relationship, the image quality of the divided images formed on each unit screen portion is improved while reducing the size of the device by realizing the thinning effect and height reduction effect of the device. Thus, it is possible to provide a rear projection type multi-vision display device capable of reducing the variation in image quality between the divided images and improving the uniformity of the image quality as a whole screen.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional schematic view showing an embodiment of a rear projection multivision display device according to the present invention.
FIG. 2 is a schematic front view showing an embodiment of a rear projection multivision display device according to the present invention.
FIG. 3 is a schematic plan view showing an embodiment of a rear projection multivision display device according to the present invention.
FIG. 4 is a cut perspective view showing a specific example of a reflector.
[Explanation of symbols]
2 Screen surface 2A, 2B, 2C, 2D Unit screen portion 4 Outer frame member 6 Device frame 8 Caster 10 Level adjustment member 12A, 12B Projector 14A, 14B Reflector 16A, 16B Projection unit 22 Reflective film 24 Holding frame 26 Protective member

Claims (5)

A first unit screen portion and a second unit screen portion are disposed adjacent to each other in a first direction, and one screen surface includes the first unit screen portion and the second unit screen portion. A first projector for projecting the first image light from the back side of the screen surface to the first unit screen portion, and the first image light from the first projector. A first projection unit including a first reflector that reflects toward the first unit screen portion; and a second image from the back side of the screen surface with respect to the second unit screen portion. A second projector for projecting light, and a second reflector for reflecting the second image light from the second projector toward the second unit screen portion. A rear projection type multi-vision display device having a projection unit,
The first projector is disposed on the second reflector side with respect to the first reflector, and the second projector is opposite to the first reflector with respect to the second reflector. The first reflector made by the first reflector with respect to the normal direction of the screen surface is 45 degrees, and the second reflection with respect to the normal direction of the screen surface body is a second angle 55 degrees form the first angle rather than 10 degrees smaller the second angle,
Each of the first projector and the second projector is a cathode ray tube, a liquid crystal panel, or a mirror panel, and the horizontal and vertical dimensions of the pixels on the screen surface are 1.5 mm or less. A rear projection type multi-vision display device.   A set of the first unit screen portion and the first projection unit and a second unit screen portion in a second direction orthogonal to both the first direction and the normal direction of the screen surface; The second configuration equivalent to the first configuration is arranged adjacent to the first configuration composed of two sets of the second projection unit. The rear projection type multi-vision display device described in 1.   3. The rear projection type multi-vision display device according to claim 1, wherein the first direction is a vertical direction, and a normal direction of the screen surface is a horizontal direction.   The direction of the optical axis of the first projector is substantially vertical in a cross section including both the first direction and the normal direction of the screen surface. The rear projection type multi-vision display device according to any one of the above.   The first reflector and the second reflector are both formed by holding a film having a reflective layer in a planar shape by applying a tensile force. The rear projection type multi-vision display device according to any one of the above.

Images