JP2001318429A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device which solves the problems with the projection type display device dealing with multiscreens; for example, structures are complicated and regulation is made laborious and a cost is correspondingly increased by the need for a distortion corrector for the purpose of correcting trapezoidal distortion. SOLUTION: The display device is so constituted that projection lens groups 20 may be positioned and fixed to lens holding plates 13 fixed to casings 11 in plural positions where projection optical axes, i.e., the central axes of the projection lens groups 20 are parallel to the image central lines 61 of light valves 12 held in the casings and are offset by prescribed distances. The multiscreens may be constituted by adjacently arranging the projection type display devices 1, 2 and 3 having the projection lens groups 20 fixed to the positions different from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device, and more particularly to a projection type display device suitable for a multi-screen in which a plurality of projection type display devices are used to arrange and project projected images on a screen. It relates to a display device.

[0002]

2. Description of the Related Art FIG. 5 is a side sectional view showing the structure of a conventional multi-screen projection display device. In the figure,
Inside the housing 102 of the first projection display device 101,
For example, a light valve 103 that forms an optical image corresponding to an input video signal, such as a liquid crystal panel, is held. The projection lens group 104 is configured by arranging a plurality of lenses so as to form the same projection optical axis 115.
02 is held so as to protrude from the inside to the outside.

Further, the projection lens group 104 and the light valve 103 are relatively positioned such that the image center of the light valve 103 is positioned on the projection optical axis 115 and the projection optical axis 115 is perpendicular to the screen of the light valve 103. Is positioned.

A distortion corrector 105 disposed on the exit surface side of the projection lens group 104 holds the convex lens 106, and holds the convex lens 106 so that its optical axis coincides with the projection optical axis 115. A lens holder 107 is fixed to the tip of the group 104. Further, the distortion corrector 105
Is a concave lens 108 and a lens holder 10 for holding the concave lens 108.
9, the concave lens 10 is adjusted by adjusting screws 110 and 111 that penetrate through holes formed in the lens holder 109 and screw with screw grooves formed in the lens holder 107.
8 and the convex lens 106 are arranged to face each other.

[0005] Further, each adjusting screw 110, 111
A coil spring 11 disposed between the lens holder 109 and the lens holder 107 in a compressed state in order to bias these lens holders in a direction away from each other.
2,113 and hold it.

The generatrix of the convex lens 106 and the generatrix of the concave lens 108 are maintained in a substantially parallel state. In addition, the convex lens 106 and the concave lens 108 are
The relative angle is changed by the adjustment of 11, so that the curvature of each lens is set so that the horizontal magnification of the optical image generated by the light valve 103 can be finely adjusted.

On the other hand, the second projection type display device 121 has exactly the same configuration as the above-mentioned first projection type display device 101, so that the description of the configuration is omitted. The same components as those of the first projection display device 101 are denoted by the same reference numerals and denoted by the following reference numerals.

That is, the second projection display device 121 includes a housing 122, a light valve 123, a projection lens group 124,
Distortion corrector 125, convex lens 126, lens holder 12
7, concave lens 128, lens holder 129, adjustment screw 1
30 and 131 and coil springs 132 and 133.

Next, the positional relationship between the first projection display device 101, the second projection display device 121, and the screen 140 will be described.

In the first projection display device 101, a projection optical axis 115, which is an optical axis of the projection lens group 104, is arranged at a predetermined position perpendicular to the screen 140. The first line is adjusted by adjusting the generatrix of the convex lens 106 and the generatrix of the concave lens 108 to be parallel.
In the image projected on the screen 140 by the projection display device 101, the image center of the light valve 103 is located at the intersection 141 between the extension of the projection optical axis 115 and the screen 140.

When a rectangular optical image is formed on the light valve 103 in this state, a rectangle similar to this is projected on the screen 140. The instruction lines 116 and 117
Are the lower ends of the optical images generated by the light valve 103,
And the trajectory of the principal ray projecting the upper end.

On the other hand, the second projection display device 121 projects the image slightly above the image on the screen 140 projected by the first projection display device 101, so that the device is slightly moved upward. It is arranged at an angle.

At this time, when the generatrix of the concave lens 128 is set to be parallel to the convex lens 126 and the generatrix as in the first projection display device 101, the projection optical axis 135 of the projection lens group 124 Since the second projection display device 121 is not perpendicular to the
The projection distance between the upper end 137 and the lower end 136 of the optical image projected on 40 differs.

For this reason, the rectangular optical image formed on the light valve 123 is projected on the screen 140 in a state where a trapezoidal distortion has occurred, but the adjusting screw 131 of the distortion corrector 125 is turned to rotate the concave lens 128. The trapezoidal distortion is corrected by changing the angle of. Note that a state in which a rectangular optical image formed on the light valve is projected on the screen 140 in a state where trapezoidal distortion has occurred is hereinafter simply referred to as trapezoidal distortion.

[0015]

In the above-described conventional multi-screen projection display apparatus, in order to correct trapezoidal distortion, a distortion corrector 10 composed of various components is used.
Since 5,125 is required, the number of parts is increased, the configuration is complicated, and the cost is increased.

An object of the present invention is to provide a multi-screen projection display device which can reduce the number of parts, simplify the configuration, and reduce the cost.

[0017]

A light valve arranged inside a housing and forming an optical image according to a video signal, a projection lens means for enlarging and projecting an optical image of the light valve,
For the image center line perpendicular to the screen of the light valve,
Positioning means for positioning the projection lens means in the housing at a plurality of mounting positions where the central axis of the projection lens means is parallel.

The positioning means is formed on the housing and formed on a mounting plane on a plane orthogonal to the image center line, and the positioning means is formed on the projection lens means and is associated with the position controlling means. It may be formed from a plurality of guide means that fit together. Further, the plurality of guide means may be formed substantially rotationally symmetric with respect to the central axis. Further, the position restricting means may be a pair of pins erected from the mounting plane, and the guide means may be a pair of engaging holes respectively engaging with the pair of pins. Further, the pair of pins may be formed at different distances from the image center line. Further, on the mounting plane, a plurality of mounting screw holes are formed at positions different from the pair of pins at a distance from the image center line, and the projection lens means has the same arrangement with respect to the pair of engaging holes, A plurality of fixing holes may be formed at positions facing the mounting screw holes.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows three projection-type display devices according to the first embodiment of the present invention arranged vertically adjacent to each other, and three projection images formed by each device are vertically and continuously arranged on a screen 4. FIG. 4 is a side sectional view of a main part showing a state when the image is projected. On the other hand, FIG.
The three projection display devices 1, 2, and 3 of FIG.
It is principal part sectional drawing seen from the same arrow direction at the position of A.

The first to third projection type display devices 1, 2 and 3 shown here are constituted by the same components except that a mounting position of a projection lens group 20 described later is different.
The common components are denoted by the same reference numerals, and their configuration will be described mainly with reference to the first projection display device 1 located at the center.

A light valve 12 for forming an optical image corresponding to an input video signal, such as a liquid crystal panel, is held inside a housing 11 of the first projection display device 1. An opening 11a is formed in a front end face 11b of the housing 11, and a lens holding plate 13 described later is fixed to a predetermined position on the front end face 11b so as to cover the opening 11a halfway.

FIG. 3 shows the structure of the lens holding plate 13 and the front end surface 1 of the housing 11 as described above.
Light valve 1 when fixed to 1b (FIGS. 1 and 2)
FIG. 3 is a configuration diagram for explaining a relative positional relationship with the device 2, and is a diagram viewed from the same arrow direction at the position of the instruction line AA in FIG. 1 as in FIG. 2. However, all parts except the lens holding plate 13 and the light valve 12 are omitted.

As shown in FIG. 3, a lens holding plate 13 has an image center 12 of an optical image generated by a light valve 12 when fixed to the first projection display device 1 as described above.
An opening 13b is formed centered on an image center line 61 that includes a and is perpendicular to the screen of the light valve 12. The point at the center of the opening 13b where the image center line 61 intersects with the mounting plane including the mounting surface 13a of the lens holding plate 13 is defined as a virtual center 62 (FIG. 1).

As shown in FIG. 3, on the mounting surface 13a of the lens holding plate 13, a positioning pin 14 is planted at a position L1 from the virtual center 62, and at a distance L3 from the virtual center, A guide pin 15 is formed at a position opposite to the positioning pin 14 via the center 62.

Further, a radius L2 (= L1) from the virtual center 62
CW from the positioning pin 14 on the circumference of
A mounting screw hole 16 is formed at an angle θ1 in the (clockwise) direction, a mounting screw hole 17 is formed at a position at an angle θ2 in the CCW (counterclockwise) direction from the mounting screw hole 16, and the mounting screw hole 17 is formed. A mounting screw hole 18 is formed at a position at an angle θ3 in the CCW (counterclockwise) direction.
Note that it is desirable that the angles θ2 and θ3 are each close to 180 degrees.

On the other hand, the projection lens group 20 shown in FIG. 1 is formed by arranging a plurality of lenses on the lens holding tube 21 so as to form the same projection optical axis 63, and projects the outer peripheral surface of the lens holding tube 21. A mounting flange 21a is formed at the center in the direction of the optical axis 63. FIG. 4 is a configuration diagram for explaining the positional relationship between the projection optical axis 63 of the projection lens group 20 and various formed holes formed in the mounting flange 21a, and similarly to FIG. It is the figure seen from the same arrow direction at the position of A. However, except for the projection lens group 20, all are omitted.

In the figure, the first positioning hole 25 is positioned at a distance L1 from the projection optical axis 63 to such an extent that the positioning pin 14 (FIG. 3) planted on the mounting surface 13a of the lens holding plate 13 passes through. Hole diameter. Also, the projection optical axis 63
The lens holding plate 13 is located at a distance of L3 from the lens and opposite to the first positioning hole 25 via the virtual optical axis 63.
A first rotation-preventing hole 29 into which the guide pin 15 (FIG. 3) implanted on the mounting surface 13a is fitted.

A first fixing hole 26 is located on the circumference of a radius L2 from the projection optical axis 63 and at an angle θ1 in the CW (clockwise) direction from the first positioning hole 25.
6 and a CCW (counterclockwise) angle θ2, a first fixing hole 27 is also provided.
Similarly, first fixing holes 28 are formed at positions at an angle θ3 in the (counterclockwise) direction.

On the other hand, assuming polar coordinates with the projection optical axis 63 as the center, and when the rotation angle of the first positioning hole 25 is 0 °, the rotation angle is about 140 ° and the position is offset to a position about 2 mm away from the center. Assume a virtual center 64. The offset virtual center 64 includes the offset virtual center 64, and is in a direction of about 60 ° in a rotation angle of the coordinate axis on an indication line 65 that is substantially perpendicular to a line connecting the offset virtual center 64 and the projection optical axis 63. A second positioning hole 30 is formed at a position of a distance L1 from.

A second detent hole 34 is formed at a distance of L3 from the virtual offset center 64 and opposite to the second positioning hole 30 via the virtual offset center 64. I have.

The second fixed hole 3 is located on the circumference of the radius L2 from the offset virtual center 64 and at an angle θ1 in the CW (clockwise) direction from the second positioning hole 30.
1, a second fixing hole 32 at a position of an angle θ2 in the CCW (counterclockwise) direction from the fixing hole 31, and a second fixing hole 32 at a position of an angle θ3 in the CCW (counterclockwise) direction from the fixing hole 32. Two fixing holes 33 are respectively formed.

Similarly, the rotation angle of the polar coordinates is about -1.
An imaginary offset center 66 is assumed at a position approximately 40 mm away from the center at 40 °. And this offset virtual center 6
6, the direction of the rotation of the coordinate axis on the indication line 67 substantially orthogonal to the line connecting the virtual offset center 66 and the projection optical axis 63 is about -60 °, and the virtual offset center 66 is
A third positioning hole 35 is formed at a distance L1 from the position. Further, the third detent hole 3 is located at a position L3 from the offset virtual center 66 and opposite to the third positioning hole 35 via the offset virtual center 66.
9 are formed.

The third fixing hole 3 is located on the circumference of the radius L2 from the virtual offset center 66 and at an angle θ1 in the CW (clockwise) direction from the third positioning hole 35.
6, a third fixing hole 37 at the angle θ2 in the CCW (counterclockwise) direction from the fixing hole 36, and a third fixing hole 37 at the angle θ3 in the CCW (counterclockwise) direction from the fixing hole 31. Three fixing holes 38 are respectively formed.

Accordingly, the first, second, and third holes are substantially rotationally symmetric with respect to the projection optical axis 63. The third hole and the third hole are each formed at a position shifted from the rotationally symmetric position by 2 mm in a predetermined direction with respect to the first hole.

The first to third projection display devices 1, 2 and 3 shown in FIG. 1 are arranged such that the projection lens group 20 having the mounting flange 21a formed with various holes as described above is mounted at different mounting positions. The lens is attached to the lens holding plate 13, and the method of attaching the lens will be described below.

As shown in FIG. 2, in the first projection display device 1, the first positioning holes 25 formed in the mounting flange 21a are used as guides for the positioning pins 14, and the first rotation preventing holes 29 are used as guides. Positioning is performed by inserting the fixing screw holes 41, 42, 43 into the first fixing holes 26, 27, 28, respectively.
The projection lens group 20 is fixed to the lens holding plate 13 by being screwed with the projections 7 and 18.

Therefore, in the first projection display apparatus 1, the image center line 61 perpendicular to the screen of the light valve 12 and the projection optical axis 63 which is the center axis of the projection lens group 20 coincide with each other.
As shown in FIG. 1, an image centered on the image of the light valve 12 is projected onto an intersection 4a between the screen 4 arranged so that the projection optical axis 63 is vertical and the projection optical axis 63.

On the other hand, as shown in FIG. 2, in the second projection display device 2, the second projection
The positioning holes 30 are inserted into the positioning pins 14 and the second detent holes 34 are inserted through the guide pins 15, respectively, and positioned, and the fixing screws 41, 42, 43 are respectively inserted into the second fixing holes 31, 32,. 33 and screw hole 1
The projection lens group 20 is fixed to the lens holding plate 13 by being screwed into 6, 17, and 18.

At this time, while the image center line 61 perpendicular to the screen of the light valve 12 coincides with the offset virtual center 64 (FIG. 4), the projection optical axis 63 which is the center axis of the projection lens group 20 is It moves about 2 mm below the image center line 61.

Accordingly, in the second projection display device 2, the image center of the light valve 12 is shown in FIG. 1 on the screen 4 arranged so that the projection optical axis 63 of the projection lens group 20 is vertical. 4b at the intersection with the projection optical axis 63
Is projected at a position shifted downward by a distance X1 from. The distance X1 is a length obtained by multiplying the offset amount (2 mm) of the projection optical axis 63 with respect to the image center line 61 by the magnification of the projection lens group 20.

In the second projection display device 2, since the projection optical axis 63 of the projection lens group 20 is set perpendicular to the screen 4, the upper end 51 and the lower end 52 of the optical image are formed.
Since the difference in the reach distance between the projected image and the projected image is small, trapezoidal distortion of the projected image can be suppressed.

As shown in FIG. 2, in the third projection type display device 3, the third projection
The positioning holes 35 are inserted into the positioning pins 14 and the third detent holes 39 are inserted through the guide pins 15, respectively, and positioned, and the fixing screws 41, 42, 43 are respectively inserted into the third fixing holes 36, 37,. 38 and screw holes 1
The projection lens group 20 is fixed to the lens holding plate 13 by being screwed into 6, 17, and 18.

At this time, while the image center line 61 perpendicular to the screen of the light valve 12 and the virtual offset center 66 (FIG. 4) match, the projection optical axis 63 which is the center axis of the projection lens group 20 is It moves upward by about 2 mm with respect to the image center line 61.

Accordingly, in the third projection display device 3, the image center of the light valve 12 is shown in FIG. 1 on the screen 4 arranged so that the projection optical axis 63 of the projection lens group 20 is vertical. 4c with the projection optical axis 63
Is projected upward from the position shifted by the distance X2. The distance X2 is a length obtained by multiplying the offset amount (2 mm) of the projection optical axis 63 with respect to the image center line 61 by the magnification of the projection lens group 20.

Also, in the third projection display device 3, since the projection optical axis 63 of the projection lens group 20 is set perpendicular to the screen 4, the upper end 53 and the lower end 54 of the optical image.
Since the difference in the reach distance between the projected image and the projected image is small, trapezoidal distortion of the projected image can be suppressed.

As described above, the first embodiment according to the present invention
According to the projection type display device, by arranging a plurality of projection type display devices having different rotation angles for mounting the projection lens groups adjacent to each other, a multi-screen in which trapezoidal distortion of a projected image on the screen is suppressed is realized. can do.

In the first embodiment, the projection lens group is fixed to the lens holding plate with fixing screws.
However, the present invention is not limited to this, and other fixing methods such as fixing with an adhesive may be used. Further, in the first embodiment, three examples of the mounting method of the projection lens group using the first to third positioning holes and the like are described. However, the present invention is not limited to this. May be set.

In the first embodiment, the positioning of the projection lens group and the fixing by screws are separated. However, these may be integrally formed by adding fixing means to the positioning pins. Good. Further, in the first embodiment, the mounting flange and the lens holding plate are provided with pins and holes for engaging with the pins to regulate the mounting position. However, the present invention is not limited to this. Various aspects can be taken, such as the position may be regulated by forming a part.

[0049]

According to the projection type display device of the first aspect of the present invention, a plurality of projection type display devices having different mounting positions of the projection lens means are arranged such that the central axis of each projection lens means is perpendicular to the screen. By arranging adjacently to become
A multi-screen with trapezoidal distortion suppressed can be realized. Further, since no distortion correction means for correcting trapezoidal distortion is required, the configuration is simplified, and the cost increase for multi-screen compatibility can be suppressed.

According to the projection type display device of the second or fourth aspect of the present invention, when the projection lens means is mounted on the housing, it is guided to each mounting position, so that the mounting operation becomes easy.

According to the projection type display device of the third aspect of the present invention, each mounting position of the projection lens means is set at a position where the projection lens means is rotated by a predetermined angle, so that the mounting operation is simply facilitated. In addition, the distance between the center axes at each mounting position can be set minutely.

According to the projection type display device of the present invention, it is possible to prevent the various holes formed in the projection lens means from being concentrated or overlapping on the same plane of the flange. Therefore, it is possible to set more mounting positions.

[Brief description of the drawings]

FIG. 1 shows three projection type display devices according to a first embodiment of the present invention, which are vertically overlapped with each other, and three projection images formed by each device are successively arranged vertically and projected on a screen. It is a side view showing a state.

FIG. 2 shows three projection display devices 1, 2, and 3 of FIG.
It is sectional drawing seen from the same arrow direction at the position of instruction | indication line AA.

FIG. 3 is a configuration diagram for explaining a configuration of a lens holding plate 13 and a corresponding positional relationship between the lens holding plate 13 and the light valve 12.

FIG. 4 is a configuration diagram for explaining a positional relationship between a projection optical axis 63 of the projection lens group 20 and various forming holes formed in a mounting flange 21a.

FIG. 5 is a side sectional view showing the configuration of a conventional multi-screen projection display device.

[Explanation of symbols]

1 first projection display device, 2 second projection display device, 3 third projection display device, 4 screen,
4a, 4b, 4c Intersection point, 11 housing, 11a opening, 11b front end face, 12 light valve, 12
a center of image, 13 lens holding plate, 13a mounting surface, 14 positioning pin, 15 guide pin, 1
6, 17, 18 mounting screw hole, 20 projection lens group, 21 lens holding cylinder, 21a mounting flange,
25 first positioning hole, 26, 27, 28 first fixing hole, 29 first detent hole, 30 second positioning hole, 31, 32, 33 second fixing hole, 3
4 second detent hole, 35 third positioning hole,
36, 37, 38 Third fixing hole, 39 Third detent hole, 41, 42, 43 fixing screw, 61 Image center line, 62 Virtual center, 63 Projection optical axis, 6
4,66 offset virtual center, 65,67 indicator line.

Continued on the front page F term (reference) 2H088 EA14 EA18 EA19 HA24 HA28 MA20 5C058 EA03 EA12 EA45 5C094 AA14 AA43 AA44 AA48 BA16 BA43 CA19 CA24 DA01 ED01 FA01 5G435 AA00 AA17 BB12 BB17 CG12 GG04 GG02

Claims (6)

[Claims] 1. A light valve arranged inside a housing and forming an optical image according to a video signal, projection lens means for enlarging and projecting an optical image of the light valve, and a light valve perpendicular to a screen of the light valve. And a positioning means for positioning the projection lens means in the housing at a plurality of mounting positions where the central axis of the projection lens means is parallel to the image center line. 2. The positioning device according to claim 1, wherein said positioning device is formed on said housing and formed on a mounting plane on a plane orthogonal to said image center line, and said positioning device is formed on said projection lens device. 2. The projection type display device according to claim 1, comprising a plurality of guide means which engage with the projection display device. 3. The method according to claim 1, wherein the plurality of guide means are formed at positions on a flange formed on a peripheral surface of the projection lens means which are substantially rotationally symmetric with respect to the center axis. Item 3. A projection display device according to Item 2. 4. The apparatus according to claim 1, wherein said position regulating means is a pair of pins erected from said mounting plane, and said guide means is a pair of engaging holes respectively engaged with said pair of pins. Item 4. The projection display device according to Item 3. 5. The projection display device according to claim 4, wherein the pair of pins are formed at different distances from the image center line. 6. A plurality of mounting screw holes are formed in the mounting plane at positions different from the pair of pins with a distance from the image center line, and the projection lens means further includes a pair of engaging holes respectively. 6. The projection type display device according to claim 5, wherein a plurality of sets of fixing holes facing the mounting screw holes are formed in the same arrangement with respect to the mounting screw holes.