JP3015695B2 - Projection screen unit having adjustment mechanism and display device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type screen which is used for displaying a stereoscopic image and has an adjusting mechanism for displaying an appropriate image, and a display device using the screen.

[0002]

2. Description of the Related Art When an image from a television receiver is projected on a large screen, a projection screen is often used as is well known. This screen (9) is shown in FIG.
As shown in the figure, a cathode ray tube (90) for projecting a television image is provided at a lower portion inside the cabinet (7) with its upper surface obliquely rearward. . On the optical path of the cathode ray tube (90), a reflection mirror (91) is mounted in the interior of the cabinet (7).
The beam emitted from (0) through the magnifying lens (92) is reflected by the reflecting mirror (91) and reaches the screen (9).
(See Japanese Utility Model Laid-Open No. 2-71834).

FIG. 16 shows the structure of the screen (9).
(Japanese Utility Model Laid-Open No. 4-129151)
No.). The screen (9) has a transparent Fresnel lens (52) having a thickness of several mm on a well-known lenticular lens (5) having a vertically extending semicylindrical wrench surface (5a) juxtaposed laterally, and a sealing material. The two lenses (5) and (52) are formed of an acrylic resin. The reason why the two lenses (5) and (52) are tightly joined is to reduce the warping and deformation of the lenticular lens (5) due to changes in temperature and humidity.

[0004]

In recent years, stereoscopic televisions have been proposed which display images stereoscopically using binocular parallax of a human. As shown in FIG. 17, the television includes, in a cabinet (7), an L-side projector (6) for irradiating an image incident on the left eye and an R-side projector (60) for irradiating an image incident on the right eye. And project both images on the screen (9). L-side projector for the left eye of the viewer
Only the light from (6) is incident, and the right eye is the R-side projector
Only light from (60) is incident, and stereoscopic images can be recognized by binocular parallax. Therefore, the light from each of the projectors (6) and (60) must accurately reach both eyes of the viewer, and the requirement for warpage and deformation of the screen (9) becomes severe. In other words, as shown by a dashed line in FIG. 17, when the screen (9) is bent and deformed due to a change in temperature or humidity, light does not accurately reach both eyes of the viewer.

However, in the structure of the conventional screen (9), since the lenticular lens (5) and the Fresnel lens (52) are formed of the same material, warpage and deformation due to changes in temperature and humidity are reduced. It cannot be strictly controlled, and it is difficult for a viewer to accurately recognize a stereoscopic image. The applicant previously tried to prevent warpage and deformation by bonding a glass plate to one surface of the lenticular lens (5), but the warpage and deformation also occur due to the difference in expansion coefficient. SUMMARY OF THE INVENTION It is an object of the present invention to provide a screen capable of suppressing a warp due to a change in temperature or humidity more strictly than before, and allowing a viewer to accurately recognize a stereoscopic image, and a display device using the screen.

[0006]

Means for Solving the Problems Projection type screen unit
(1) includes a screen in which a lenticular lens (5) is tightly sandwiched between reinforcing plates (50) (50) made of a glass material having a smaller expansion coefficient than the lens (5).
In addition, the projection type screen unit (1) has a projection side screen (3) including a lenticular lens (5) and an observation side screen (4) in front and behind, respectively, with an intermediate screen plate (2) made of glass material interposed therebetween. And the intermediate screen plate (2) and the observation screen (4) are aligned with the projection screen (3) along the left and right adjustment holes (20) formed in the intermediate screen plate (2).
A first adjustment mechanism (300) for moving in the left-right direction with respect to
The observation screen (4) is rotated about the optical axis along the elongated hole (41) formed in the observation screen (4) with respect to the intermediate screen plate (2) and the projection screen (3). Second
The two adjustment mechanisms (300) and (400) can be operated by the same adjustment means.

[0007]

[Function and effect] The lenticular lens (5) is
A reinforcing plate made of a glass material with a smaller expansion coefficient than (5) (5
0 and (50), the warp and deformation are suppressed by the reinforcing plates (50) and (50) even when the temperature and humidity change. Therefore, the viewer can accurately recognize the stereoscopic video. The first adjustment mechanism (300) adjusts the intermediate screen plate (2) and the observation screen (4) in the left-right direction, and the second adjustment mechanism (400) adjusts the observation screen.
(4) is adjusted in the rotation direction. Therefore, the adjustment of the rotation direction and the adjustment of the horizontal direction of the observation side screen (4) are performed independently, and when any one of the adjustments is performed, the other adjustment does not shift, and the adjustment work is troublesome. It does not take. In addition, since both adjustment mechanisms (300) and (400) are adjusted by the same adjustment means, the adjustment can be performed easily.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a three-dimensional display device (1
(00) is a side view showing the internal configuration. Inside the display device (100), L-side and R-side projectors (6) for projecting images are provided.
A first reflecting mirror (70) is provided in front of the projectors (6) and (60), and a second reflecting mirror (7) is provided above the projectors (6) and (60).
1) will be deployed respectively. Light from the two projectors (6) and (60) is reflected by the first reflection mirror (70) and the second reflection mirror (71) and enters the screen unit (1) mounted on the front of the cabinet (7). . Each projector (6) (6
Reference numeral 0) incorporates a light source (61), a liquid crystal panel (62) as an image display device, a projection lens (63), and the like, and is provided so as to be slidable up, down, front, back, left, and right. The inside of the stereoscopic display device (100) has the same configuration as that previously proposed by the applicant in Japanese Patent Application Laid-Open No. 4-35492.

The screen unit (1), which is one of the features of this embodiment, is configured as shown in a sectional view in FIG. The screen unit (1) has a projection screen (3) and an observation screen (4) facing each other with an intermediate screen plate (2) made of glass interposed therebetween. Both screens (3) and (4) and the intermediate screen plate (2)
The main body of the screen on which the image is projected is supported by a metal frame (10), and both screens (3)
(4) is attached to the intermediate screen plate (2) via rigid spacers (11) provided at the four corners of the frame (10). Thereby, the distance between the two screens (3) and (4) and the intermediate screen plate (2) is kept constant. The projection-side screen (3) and the observation-side screen (4) both have a configuration in which a lenticular lens (5) is sandwiched between reinforcing plates (50) (50) made of glass, and a lenticular lens of the projection-side screen (3).
In (5), the bulging direction is directed to the back of the cabinet (7), and the lenticular lens (5) of the observation screen (4) is directed to the bulging direction toward the viewer. The lenticular lens (5) and the reinforcing plates (50) and (50) of both screens (3) and (4) are fixed on one side with adhesive tape (54). A lenticular lens for the projection side screen (3) and the observation side screen (4)
The bulging direction of (5) may be opposite to that in the above embodiment.

As shown in FIG. 3, both projectors (6) (6)
The image projected from (0) is condensed by the lenticular lens (5) of the projection screen (3), and the intermediate screen plate (2)
Imaged on top. The viewer is separated from the screen unit (1) by a predetermined distance and passes through the viewing screen (4).
A stereoscopic image can be recognized by viewing the parallax image on the intermediate screen plate (2) with the left and right eyes, respectively. The lenticular lens (5) is made of acrylic resin and has reinforcing plates (50) (50)
Is formed from glass. Here, the expansion coefficient of the glass is 0.85 × 10 ⁻⁵ / ° C., and the expansion coefficient of the acrylic resin is 7 × 10 ⁻⁵ / ° C. Since the lenticular lens (5) is sandwiched between the reinforcing plates (50) and (50), even if the temperature or humidity of the outside air changes, the reinforcing plate (5
Due to (0) and (50), warpage and deformation are suppressed more than before, and the lenticular lens (5) maintains a flat state. Therefore, the image light surely reaches both eyes of the viewer. Since the lenticular lens (5) and the reinforcing plates (50) and (50) are fixed on one side with an adhesive tape (54), the expansion and contraction of the lenticular lens (5) is prevented.
The direction of shrinkage can be restricted to the direction not bonded, and furthermore, the displacement of the reinforcing plates (50) and (50) and the lenticular lens (5), and the projection side screen (3) and the observation side screen (4)
Deviation can also be suppressed.

(Adjustment mechanism) As described above, when the image focused on the projection screen (3) and formed on the intermediate screen plate (2) is viewed through the observation screen (4), If the left and right positions of the lenticular lenses (5) of the two screens (3) and (4) are shifted, the projected light from the L-side and R-side projectors (6) and (60) can reach the viewer's eyes accurately. And cannot see a stereoscopic image. If the projection side screen (3) is displaced from the observation side screen (4) in the direction of rotation about the optical axis, the left and right lenticular lenses (5).
The pitches P and P1 (see FIG. 2) of (5) are shifted,
Similarly, a stereoscopic image cannot be seen. In view of such a problem, the applicant has installed the projection side screen (3) in a cabinet.
(7), the intermediate screen plate (2) and the observation screen (4) can be moved in the horizontal direction.
(4) The present invention proposes an adjustment mechanism that is provided rotatably about the optical axis and that can easily adjust the horizontal direction and the rotation direction. The details are described below.

FIG. 4 is a front view of the screen unit (1), and FIG. 5 is a sectional view of the same side. The screen unit (1) has a horizontal width of 940 mm and a vertical length of 74.
It is formed to 0 mm. The projection-side screen (3) is provided with screws (72) protruding from the cabinet (7) in escape holes (44) and (21) formed in the corners of the observation-side screen (4) and the intermediate screen plate (2), respectively. ) With the nut (73)
It is attached to (7) (see FIG. 6). Observation screen
On the frame (10) of (4), there are three through holes (40) at the upper edge, one at each side edge and three at the lower edge.
The intermediate screen plate (2) is attached to the projection-side screen (3) by left-right fixing screws (80) that fit into the through holes (40) with a margin. Observation screen
On the frame (10) of (4), rotation direction fixing screws (8) are attached at three places on the upper edge, two on each side edge, and three on the lower edge in total. Then, the observation side screen (4) is attached to the intermediate screen plate (2) by the screws (8). In the screen unit (1) according to the present embodiment, the load on the intermediate screen plate (2) is received by the left-right fixing screw (80) at the center of the lower edge.

[0013] At each corner of the frame (10) of the viewing screen (4), the rotation direction fixing screw (8) is larger than the through hole (40).
An elongated hole (41) is provided between the screw (8) and the through hole (40). The long holes (41) are located on an imaginary circle indicated by a dashed line centered on the center point P of the screen unit (1), which is the optical axis, and each long hole (41) has an intermediate screen plate.
A protruding shaft (22) projecting from (2) is fitted. Intermediate screen board
(2) and the observation-side screen (4) are formed so as to be attachable to the counterpart member even if the screen is turned upside down. Therefore, the upper end of the screen unit (1) will be described below.

FIG. 6 is a bird's-eye view of part A of FIG. 4, and FIG. 7 is an enlarged front view of the main part of FIG. Rotation direction fixing screw (8)
Is located on the right side of the through hole (40), and is located at the center of the intermediate screen plate (2) and the observation side screen (4).
On the right side of (8), notches (23) and (42) are opened, the upper end of which is opened.
The notches (23) and (42) overlap with each other in the state where they are attached to (2). In both notches (23) and (42), an axis (30) projecting from the projection side screen (3) is located. As shown in FIG. 7, in the through-hole (40), a left-right adjustment hole (20) extending left and right on the frame (10) of the intermediate screen plate (2) is located.
The left-right fixing screw (80) is screwed into the projection screen (3) through the left-right adjustment hole (20). Therefore, the intermediate screen plate (2) is allowed to move in the left-right direction with the left-right fixing screw (80) loosened. Also, left and right adjustment holes (20)
The intermediate screen plate (2) is positioned in the up-down direction by the fitting of the left and right direction fixing screws (80).

On the left side of the through hole (40), an observation screen
On the frame (10) of (4), a notch (43) with an open upper end
Is opened, and an intermediate screen plate (2) is set in the notch (43).
A shaft (24) protruding from is located. The notch (43) is for adjusting the rotation of the observation side screen (4), and the notch (42) (2
3) is for adjusting the intermediate screen plate (2) and the observation side screen (4) in the left-right direction. To adjust the horizontal direction, first tighten the rotation direction fixing screw (8),
Is fixed to the intermediate screen plate (2), and then the left-right fixing screw (80) is loosened. Insert the tip of the adjusting screwdriver (200) between the shaft (30) and the notches (23) and (42), rotate the screwdriver (200) in the screen, and cut the notch (42) ( By making contact with the side edge of (23), the intermediate screen plate (2) and the observation side screen (4) can be moved left and right by a margin of the left and right adjustment holes (20) (see FIG. 8). That is, the left and right adjustment holes (20) and notches
(42) and (23) constitute a first adjustment mechanism (300) for moving the intermediate screen plate (2) and the observation screen (4) to the left and right.

In order to adjust the rotation direction of the viewing screen (4), first, the rotation direction fixing screw (8) is loosened while the left and right direction fixing screw (80) is fastened. Shaft (24) and notch (4
Insert the tip of the adjustment driver (200) during 3), and rotate the driver (200) in the same manner as in the horizontal adjustment. As described above, since the observation side screen (4) has an elongated hole (41) to be fitted to the protruding shaft (22) on an imaginary circle centered on the center point P, the dashed line in FIG. As shown by, the observation side screen (4) can be rotated about the point P by a margin of the elongated hole (41). That is, the notch (43) and the elongated hole (41) constitute a second adjustment mechanism (400) for rotating the observation side screen (4).
If the interval between the long holes (41) is set long, precise rotation adjustment becomes possible. First, adjust the rotation direction
(8) is loosened, the rotation of the observation side screen (4) is adjusted, and the screw (8) is tightened.
0) Loosen the observation side screen (4) and the intermediate screen plate
The adjustment in the left-right direction of (2) is performed.

(Specific adjustment) The adjustment of the screen unit (1) is performed in the following procedure. As shown in FIG. 2, images are emitted from the projectors (6) and (60) installed in the cabinet (7) so that the images from both projectors (6) and (60) overlap on the screen unit (1). Then, the up, down, left and right positions of the projectors (6) and (60) are adjusted. Align the center of the image with the screen center and focus each image. In this state, only the R-side projector (60) is illuminated, and white display is performed on the screen unit (1). On the screen unit (1), as shown in FIG. 10, moire fringes, which are contrast fringes caused by the black matrix of the liquid crystal panel (62) in the projector (60), are generated.

However, the observation side screen (4) and the projection side screen (3) are displaced in the direction of rotation about the optical axis,
When the pitch P and the pitch P1 of the lenticular lens (5) do not coincide with each other (see FIG. 2), the moire fringes form oblique stripes inclined to the left or right as shown in FIGS. Therefore, in order to correctly display an image on the screen unit (1), the rotation direction fixing screw (8) is loosened, and the observation side screen (4) is rotated by the adjustment driver (200) as described above. When the moiré stripes become vertical stripes as shown in FIG.
Tighten the rotation direction fixing screw (8). Observation side screen (4)
13 and FIG.
As shown in FIG. 4, when a slightly inclined oblique stripe is formed, the observation side screen (4) is mounted upside down, and the adjustment is performed again. The moire fringes are confirmed at a point where the distance L to the screen unit (1) shown in FIG. 2 is 3 to 4 m.

After the rotation adjustment of the observation side screen (4) is completed, the observation side screen (4) and the intermediate screen plate (2) are adjusted in the left-right direction so that the viewer can surely recognize the stereoscopic image. . The adjuster moves to a point where the distance L from the screen unit (1) is 1 m, and confirms whether the projected light incident on the left eye is the brightest and the projected light incident on the right eye is the darkest suitable state. . Fig. 8
As shown in (5), the observation side screen (4) and the intermediate screen plate (2) are moved right and left by using the adjustment driver (200), and are brought into an appropriate viewing state. If the optimal viewing position is extremely displaced, the R-side projector (60) is moved right and left, and then the adjustment in the left-right direction is performed again.

In the screen having the size of the present embodiment and having a structure in which a glass plate is attached to one surface of the lenticular lens (5), if the lenticular lens (5) extends 0.15 mm due to a change in temperature or humidity, Warpage reaches up to 7mm. In order for the viewer to reliably recognize the stereoscopic image, the warp needs to be suppressed to about 0.15 mm. In the screen unit (1) of the present embodiment, the lenticular lens (5) formed of a material having a large expansion coefficient is sandwiched between reinforcing plates (50) and (50) made of glass having a small expansion coefficient. So
Even if the temperature or humidity changes, the screen warps and deforms.
It can be stricter than before. Therefore, the viewer can be made to recognize the stereoscopic image accurately. Further, only the adjustment driver (200) can adjust the rotation direction of the observation side screen (4) and the horizontal direction of the observation side screen (4) and the intermediate screen plate (2), so that the adjustment can be easily performed. Further, since the adjustment in both directions is performed independently, when one adjustment is performed, the other adjustment does not shift,
There is no need for adjustment work.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a device configuration of a display device.

FIG. 2 is a plan view of the inside of the cabinet in which a screen unit is partially cut away.

FIG. 3 is a diagram showing an optical path passing through a projection screen, an intermediate screen plate, and an observation screen.

FIG. 4 is a front view of the screen unit.

FIG. 5 is a side view in which a part of the above is partially broken.

FIG. 6 is an overhead view of a part of the screen unit.

FIG. 7 is a front view of a main part of FIG. 6;

FIG. 8 is a view showing adjustment of the screen unit in the left-right direction.

FIG. 9 is a diagram showing adjustment of the rotation direction in the above.

FIG. 10 is a diagram showing moire fringes in a vertical fringe state.

FIG. 11 is a diagram showing a state in which moire fringes are obliquely inclined.

FIG. 12 is a diagram showing a state in which moire fringes are inclined obliquely.

FIG. 13 is a diagram illustrating a state in which moire fringes are gently inclined obliquely.

FIG. 14 is a diagram showing a state in which moire fringes are gently inclined obliquely.

FIG. 15 is a side view showing a device configuration of a conventional display device.

FIG. 16 is a diagram showing a joint state between a conventional lenticular lens and a Fresnel lens.

FIG. 17 is a plan view showing the inside of a cabinet in which a conventional screen unit is partially cut away.

[Explanation of symbols]

 (1) Screen unit (2) Intermediate screen plate (3) Projection side screen (4) Observation side screen (5) Lenticular lens (50) Reinforcement plate

Continuation of the front page (56) References JP-A-4-40440 (JP, A) Japanese Utility Model Application Sho 63-200834 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 21 / 62 G03B 21/10 H04N 5/74

Claims (3)

(57) [Claims] 1. An intermediate screen plate (2) made of a glass material
, A projection-side screen (3) including a lenticular lens (5) and an observation-side screen (4) are disposed in front and rear, respectively, and the lenticular lens (5) has a smaller expansion coefficient than the lens (5). In the projection type screen unit tightly held between the reinforcing plates (50) and (50) made of glass material, the intermediate screen plate (2) and the observation side screen (4) are set up on the intermediate screen plate (2). The first adjustment mechanism (300) for moving the projection screen (3) in the left and right direction along the left and right adjustment holes (20) and the observation screen (4) are projected to the intermediate screen plate (2). A second adjustment mechanism (400) for rotating around the optical axis is provided along the long hole (41) formed in the observation side screen (4) with respect to the side screen (3). Projection screen unit. 2. The projection type screen unit according to claim 1, wherein both the first and second adjustment mechanisms (300) and (400) are operably provided by the same adjustment means. 3. A display device for displaying an image from a projector provided therein, wherein a projection side screen (3) including a lenticular lens (5) with an intermediate screen plate (2) made of glass material interposed therebetween.
And an observation-side screen (4) are disposed in front and back, and a first adjustment mechanism (3) for moving the intermediate screen plate (2) and the observation-side screen (4) in the left-right direction with respect to the projection-side screen (3).
00) and the observation side screen (4)
(2) A display device having a projection type screen unit (1) provided with a second adjustment mechanism (400) for rotating about an optical axis with respect to a projection side screen (3).