JPH07175018A - Picture element position adjustment mechanism of projection type display device - Google Patents

Picture element position adjustment mechanism of projection type display device

Info

Publication number
JPH07175018A
JPH07175018A JP17405294A JP17405294A JPH07175018A JP H07175018 A JPH07175018 A JP H07175018A JP 17405294 A JP17405294 A JP 17405294A JP 17405294 A JP17405294 A JP 17405294A JP H07175018 A JPH07175018 A JP H07175018A
Authority
JP
Japan
Prior art keywords
axis
lever
transparent plate
shift
axis tilt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP17405294A
Other languages
Japanese (ja)
Inventor
Yukio Takahashi
Koichi Yoneda
広一 米田
幸男 高橋
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
Sanyo Electric Co Ltd
三洋電機株式会社
日本電信電話株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP5-267414 priority Critical
Priority to JP26741493 priority
Application filed by Nippon Telegr & Teleph Corp <Ntt>, Sanyo Electric Co Ltd, 三洋電機株式会社, 日本電信電話株式会社 filed Critical Nippon Telegr & Teleph Corp <Ntt>
Priority to JP17405294A priority patent/JPH07175018A/en
Publication of JPH07175018A publication Critical patent/JPH07175018A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To make a picture element position adjustment device of projection type display device small in size and light in weight. CONSTITUTION:This device is provided with two liquid prisms 1 and 2 on the optical path between a light valve and a projection lens. Besides, it is provided with a driving mechanism for shifting 14 which synchronously drives the mutually opposed inside transparent plates 5 and 8 of both prisms 1 and 2 in an identical direction, a driving mechanism for tilting which drives the rotation of the outside transparent plate 8 of one prism 2 and a means detecting and storing the rotating direction and the rotational amount of the respective plates 5, 8 and 9 from a reference position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pixel position adjusting mechanism for a projection display device for adjusting the positions of pixels of an image projected by a plurality of projectors.

[0002]

2. Description of the Related Art A projection display device is a display device for displaying an image formed on a light valve forming an image by enlarging and projecting it on a screen by a projection lens. The liquid crystal projector shown in the configuration diagram of FIG. As an example.

In this liquid crystal projector, the white light source 10
The light emitted from the projector 1 is split into RGB three colors by the dichroic mirrors 102 and 103 of the projector main body 100, and unnecessary polarization components are absorbed by the incident side polarization plates 104, respectively, and then the liquid crystal light valves 105R and 105R.
Intensity modulation is performed by the G. 105B to form RGB three-color images, and the images are respectively selected by the emission side polarization plate 106 and then combined by the dichroic mirrors 107 and 108 to produce the projector main body 100. Incident on the projection lens 109 from the screen 1
10 is enlarged and projected.

In recent years, as shown in FIG. 10, a plurality of projector main bodies described above are arranged side by side, and the images projected from the plurality of projector main bodies 100A, 100B and 100C are displayed side by side on a screen 110 to form a large screen. As shown in FIG. 11 or a projection-type image display device (see Japanese Patent Application Laid-Open No. 3-83036), pixel images from a plurality of projector bodies 100A and 100B are interleaved vertically and horizontally. State 1 screen 1
A projection type image display device (for example, see Japanese Patent Laid-Open No. 2-281287) has been developed in which the image is projected on 10 to achieve high resolution. Further, as disclosed in Japanese Patent Application Laid-Open No. 2-87792, a lenticular screen is formed by a plurality of projector main bodies so that left-eye pixel images and right-eye pixel images are alternately arranged in the horizontal direction. 2. Description of the Related Art There has been proposed a projection-type image display device that projects a three-dimensional image by projecting it onto the screen.

As described above, when a plurality of projector main bodies are used to form a projected image of high resolution, high brightness or a multi-screen, the positions of the pixels of the image projected from each projector main body 100 are different. The position of the incident light on the projection lens in the projector body 100 shifts due to an error or the like, and the quality of the image on the screen 110 deteriorates.

Conventionally, in order to prevent the above-mentioned deterioration in image quality, each liquid crystal projector main body 100 is placed on an optical stage, and the angle etc. of the projector main body 100 is changed by adjusting the angle etc. of the optical stage. The position of the projected image on the screen 110 was adjusted.

[0007]

However, since the alignment accuracy of each pixel on the screen 110 needs to be as high as within 1/2 pixel, the adjustment accuracy of the optical stage is extremely high. However, this adjustment work is difficult and takes a long time. In particular, when the pixels projected from one projector main body are arranged or overlapped between the images projected from the other projector main body, it is necessary to adjust the position of the projected pixels with high accuracy. It is difficult to use the method using the optical stage. What is the position of the projected pixel? It moves due to time changes and temperature changes, and it is difficult to adjust with the optical stage each time.

Further, the position adjusting mechanism of the optical stage for adjusting the position of the projector main body 100 with respect to the projection lens 109 and the screen 110 is the projector main body 100.
Since it is necessary to support the weight of the entire body and also highly accurate position adjustment of about several tens of μm is necessary, for example, in the case of a large projection display device in which the weight of the projector main body 100 is several tens kg or more. In addition, the position adjustment mechanism becomes large and the weight becomes very heavy.

Further, if this position adjustment is performed electrically, a large motor having a large drive capacity is required as a drive mechanism for adjusting the position of the optical stage, and the projection display apparatus as a whole also becomes large. Become.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a pixel position adjusting mechanism for a projection display device which is capable of reducing the size and weight of the device. is there.

[0011]

In order to achieve the above-mentioned object, the pixel position adjusting mechanism of the projection type display device according to the present invention is arranged side by side on the optical path between the light valve and the projection lens. A drive mechanism for two liquid prisms and a shift drive mechanism for synchronously rotating the inner transparent plates of the two liquid prisms facing each other, and a tilt drive mechanism for rotationally driving one outer transparent plate of both liquid prisms. Mechanism,
A means for detecting and storing the rotation direction and the rotation amount of each transparent plate from the reference position.

[0012]

When the inner transparent plates of the two liquid prisms facing each other are simultaneously driven to rotate by the shift driving device, the light refracted at the light valve side, that is, the transparent plate inside the liquid prism on the incident side is projected. The light is refracted by the same angle in the opposite direction at the lens side, that is, the transparent plate inside the liquid prism on the exit side, and is emitted as light that has been translated (shifted) with respect to the incident light.

Further, when the outer transparent plate of one of the two liquid prisms is rotationally driven by the tilt drive mechanism, the light is refracted at the outer transparent plate of the liquid prism, and the incident light is deflected (tilt). ) Emitted light is emitted.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. The same parts as those in the conventional example are designated by the same reference numerals.

FIG. 1 is a schematic diagram showing a liquid crystal projector using a pixel position adjusting mechanism of a projection type display device according to the present invention. In this liquid crystal projector, the white light source 10
The light emitted from the projector 1 is split into RGB three colors by the dichroic mirrors 102 and 103 of the projector main body 100, and unnecessary polarization components are absorbed by the respective incident side polarization plates (not shown).
Intensity modulation is performed by 105G and 105B to form images of three colors of RGB, and a polarization component of each of these images is selected by a polarizing plate on the output side (not shown) and then combined by dichroic mirrors 107 and 108. . The combined image is the liquid prism 1 arranged on the optical path between the dichroic mirror 108 and the projection lens 109.
The light enters the projection lens 109 via 2 and is enlarged and projected on the screen. 110 and 111 have an optical path of 90 °
It is a total reflection mirror for changing.

Now, as shown in the side view of FIG. 2, the pixel position adjusting mechanism of the projection display apparatus according to the embodiment of the present invention is arranged in front and back on the optical path between the liquid crystal light valve and the projection lens. It is provided with two liquid prisms 1 and 2 that are arranged and a lens barrel 3 that holds them. Both liquid prisms 1
The liquid prism 1 arranged on the rear side of 2, ie, the liquid crystal light valve side, has an outer transparent plate 4 and an inner transparent plate 5.
And the bellows 6 that connects the peripheral portions of both transparent plates 4 and 5 with each other.
And a liquid 7 filled in a space defined by the transparent plates 4 and 5 and the bellows 6.

Similarly, the liquid prism 2 on the front side, that is, on the side of the projection lens, similarly has an inner transparent plate 8, an outer transparent plate 9, a bellows 10 connecting the peripheral portions of both transparent plates 8 and 9, and both transparent plates. It is provided with a liquid 11 filled in a space defined by the plates 8 and 9 and the bellows 10. The transparent plate 4 on the outer side of the rear liquid prism 1 is fixed to the lens barrel 3, and the rear liquid prism 1
The inner transparent plate 5 and the inner transparent plate 8 of the front liquid prism 2 are, as shown in the sectional views of FIGS. 2 and 3, the axis of the lens barrel 3 via a common X-axis shift ring 12. Is supported by the Y-axis shift ring 13 so as to be rotatable around a horizontal axis center that is orthogonal to the Y-axis shift ring 13.
Is a vertical axis perpendicular to the axis of the lens barrel 3 and the X axis, that is,
The lens barrel 3 is rotatably supported around the Y axis.

The shift driving device 14 provided for rotationally driving both the transparent plates 5 and 8 is an X-axis shift driving device 15 that rotates the transparent plates 5 and 8 and the X-axis shift ring 12 about the X-axis center. And a Y-axis shift driving device 1 for rotationally driving both the transparent plates 5 and 8, the X-axis shift ring 12, the X-axis shift driving device 15 and the Y-axis shift ring 13 around the Y-axis center.
It consists of 6 and 6.

The X-axis shift driving device 15 comprises an X-axis shift lever 17 having one end fixed to the X-axis shift ring 12 and a partial worm wheel fixed to the free end of the X-axis shift lever 17 on the X-axis. A partial gear 18 made up of a partial gear (may be a partial tooth gear), a worm 19 meshing with the partial gear 18, and an X-axis shift rotatably driving the worm 19 supported by a Y-axis shift ring 13 via a bracket 20. A motor 21 is provided, and by operating the X-axis shift motor 21, the X-axis shift lever 17, the X-axis shift ring 12, and the both transparent plates 5 are rotated around the X-axis center.
・ 8 rotates in the same direction at the same time.

Further, in this embodiment, the backlash of the meshing between the partial gear 18 and the worm 19 is eliminated, and the rotations of the X-axis shift motor 21 and the worm 19 and the rotation angle of the X-axis shift lever 17 correspond accurately. In order to do so, a spring 22 is mounted over the bracket 20 and the free end of the X-axis shift lever 17.

Further, a stop hole 23 is formed at an intermediate portion of the X-axis shift lever 17, and an X-axis shift stop 24 fixed to the Y-axis shift ring 13 is inserted into the stop hole 23 so that the X-axis shift stop 24 is inserted into the stop hole 23. Axis shift stop 2
The front or rear edge of the stop hole 23 is received by 4 so that the range of rotation of the X-axis shift lever 17, the X-axis shift ring 12, and the transparent plates 5 and 8 about the X-axis center can be set to the transparent plates 5. 8 is limited to a fixed range centered on a reference position parallel to the transparent plate 4 outside the liquid prism 2 on the rear side.

Further, a photo interrupter 25 is supported on the bracket 20, and the X-axis shift lever 17 is provided.
The sensor lever 26 supported at the free end of the shield interrupts the optical path of the photo interrupter 25 so that it can be detected that the both transparent plates 5 and 8 are located at the reference position.

In addition, for example, this photo interrupter 2
A calculation for calculating the rotation direction and the rotation angle around the X-axis center from the reference position of the X-axis shift lever 17, based on the output of No. 5, the number of pulses supplied to the X-axis shift motor 21, the current, or the driving time. Means and storage means for storing the calculation result are provided.

The Y-axis shift driving device 16 includes a Y-axis shift lever 27 having one end fixed to the Y-axis shift ring 13 and a partial worm wheel fixed to the free end of the Y-axis shift lever 27 on the Y-axis. A partial gear 28 composed of (a partial tooth gear may be used), a worm 29 that meshes with the partial gear 28, and a Y-axis shift motor 31 that is supported by the lens barrel 3 via a bracket 30 and rotationally drives the worm 29. By activating the Y-axis shift motor 31, the Y-axis shift lever 27, the Y-axis shift ring 13, the X-axis shift ring 12, and both transparent plates 5 and 8 simultaneously rotate in the same direction about the Y-axis center. To do.

Further, in this embodiment, the backlash of the meshing between the partial gear 28 and the worm 29 is eliminated, and the rotations of the Y-axis shift motor 31 and the worm 29 and the rotation angle of the Y-axis shift lever 27 correspond accurately. In order to do so, a spring 32 is mounted over the bracket 30 and the free end of the Y-axis shift lever 27.

Further, a stop hole 33 is formed in the intermediate portion of the Y-axis shift lever 27, and a Y-axis shift stop 34 fixed to the lens barrel 3 is provided with the stop hole 33.
The Y-axis shift stop 34 receives the front or rear edge of the stop hole 33, and
The rotation range of the shaft shift lever 27, the Y-axis shift ring 13, the X-axis shift ring 12, and the transparent plates 5.8 around the Y-axis center is that the transparent plates 5.8 are transparent plates outside the liquid prism 2 on the rear side. 4 is limited to a fixed range centered on a reference position that is parallel to 4.

Further, a photo interrupter 35 is supported on the bracket 30, and the Y-axis shift lever 27 is supported.
The sensor lever 36 supported at the free end of the photo interrupter interrupts the optical path of the photo interrupter 35 so that it can be detected that the transparent plates 5 and 8 are located at the reference positions.

In addition, for example, this photo interrupter 3
A calculation for calculating the rotation direction and the rotation angle around the X-axis center from the reference position of the Y-axis shift lever 27 based on the output of No. 5, the number of pulses supplied to the Y-axis shift motor 31, the current or the driving time. Means and storage means for storing the calculation result are provided.

A transparent plate 9 outside the front liquid prism 2
Is supported by an X-axis tilt ring 37, and this X-axis tilt ring 37 is supported by a Y-axis tilt ring 38 so as to be rotatable around another X-axis center parallel to the previously described X-axis center.
The axis tilt ring 38 is supported by the lens barrel 3 so as to be rotatable around a Y axis center orthogonal to the axis of the lens barrel 3 and the rotation axis of the X axis tilt ring 37.

As shown in FIG. 3, a tilt driving device 39 for rotationally driving the transparent plate 9 has an X-axis tilt driving device 40 having the same structure as the X-axis shift driving device 15 and the Y-axis driving device. A Y-axis tilt driving device 41 configured similarly to the axis shift driving device 16 is provided.

That is, the X-axis tilt drive device 40 is
On the shaft, a partial gear including an X-axis tilt lever 42 having one end fixed to the X-axis tilt ring 37, and a partial worm wheel (may be a partial tooth gear) may be fixed to the free end of the X-axis tilt lever 42. 43, a worm 44 that meshes with the partial gear 43, and an X-axis tilt motor 46 that is supported by the Y-axis tilt ring 38 via a bracket 45 and rotationally drives the worm 44. The X-axis tilt motor 46 is operated. By doing so, the X-axis tilt lever 42, the X-axis tilt ring 37, and the transparent plate 9 simultaneously rotate in the same direction around the X-axis center.

Further, in this embodiment, the backlash of the meshing between the partial gear 43 and the worm 44 is eliminated, and the rotation of the X-axis tilt motor 46 and the worm 44 and the rotation angle of the X-axis tilt lever 42 correspond accurately. In order to do so, a spring 47 is mounted over the bracket 45 and the free end of the X-axis tilt lever 42. Further, a stop hole 48 is formed at an intermediate portion of the X-axis tilt lever 42, and an X-axis tilt stop 49 fixed to the Y-axis tilt ring 38 is provided in the stop hole 48.
X-axis tilt stop 49 receives the edge of the front or rear of the stop hole 48, and
The rotation range of the axis tilt lever 42, the X-axis tilt ring 37, and the transparent plate 9 around the X-axis center is centered on a reference position where the transparent plate 9 is parallel to the transparent plate 4 outside the liquid prism 2 on the rear side. It is limited to a certain range.

Further, the photo interrupter 50 is supported by the bracket 45, and the X-axis tilt lever 42 is provided.
The sensor lever 51 supported at the free end of the photo interrupter 50 interrupts the optical path of the photo interrupter 50 so that the transparent plate 9 is detected to be located at the reference position.

In addition, for example, this photo interrupter 5
Calculation for calculating the rotation direction and rotation angle around the X-axis center from the reference position of the X-axis tilt lever 42 based on the output of 0, the number of pulses supplied to the X-axis tilt motor 46, the current, or the driving time. Means and storage means for storing the calculation result are provided.

The Y-axis tilt driving device 41 includes a Y-axis tilt lever 52 having one end fixed to the Y-axis tilt ring 38 and a partial worm wheel fixed to the free end of the Y-axis tilt lever 52 on the Y-axis. A partial gear 53 consisting of (a partial tooth gear may be used), a worm 54 meshing with the partial gear 53, and a Y-axis tilt motor 56 which is supported by the lens barrel 3 via a bracket 55 and rotationally drives the worm 54. By activating the Y-axis tilt motor 56, the Y-axis tilt lever 52, the Y-axis tilt ring 38, the X-axis tilt ring 37 and the transparent plate 9 simultaneously rotate around the Y-axis center in the same direction.

Further, in this embodiment, the backlash of the meshing between the partial gear 53 and the worm 54 is eliminated, and the rotations of the Y-axis tilt motor 56 and the worm 54 and the rotation angle of the Y-axis tilt lever 52 correspond accurately. In order to do so, a spring 57 is mounted over the bracket 55 and the free end of the Y-axis tilt lever 52.

Further, a stop hole 58 is formed in the middle portion of the Y-axis tilt lever 52, and a Y-axis tilt stop 59 fixed to the lens barrel 3 is provided with the stop hole 58.
When the Y-axis tilt stop 59 receives the front or rear edge of the stop hole 58,
The rotation range around the Y-axis center of the axis tilt lever 52, the Y-axis tilt ring 38, the X-axis tilt ring 37, and the transparent plate 9 is a reference with which the transparent plate 9 is parallel to the outer transparent plate 4 of the rear liquid prism 2. It is limited to a certain range centered on the position.

Further, a photo interrupter 60 is supported on the bracket 55, and the Y-axis tilt lever 52 is
The sensor lever 61 supported at the free end of the block interrupts the optical path of the photo interrupter 60, so that the transparent plate 9 is detected to be located at the reference position.

In addition, for example, this photo interrupter 6
Calculation for calculating the rotation direction and rotation angle around the X-axis center from the reference position of the Y-axis tilt lever 52 based on the output of 0, the number of pulses supplied to the Y-axis tilt motor 56, the current, or the driving time. Means and storage means for storing the calculation result are provided.

When the transparent plates 5, 8 and 9 are located at the reference positions, as shown in the schematic diagrams of FIGS. 2 and 4, the light incident on the liquid prism 1 on the rear side travels straight and goes on the front side. It is emitted from the liquid prism 2 to the projection lens.

When the pixel position of the image projected from one liquid crystal projector among a plurality of liquid crystal projectors is shifted downward with respect to the desired position, the X-axis shift driving device 15 is operated to As shown in the schematic diagram of 5,
When the transparent plates 5 and 8 on both inner sides are rotated counterclockwise in the figure, the light rays are deflected upward at the transparent plate 5 on the inner side of the liquid prism 1 on the rear side, and the transparent on the inner side of the liquid prism 2 on the front side is deflected. On the other hand, the light is deflected downward at the plate 8 by the same angle, and is parallel-translated from the incident light from the front prism 2 by a predetermined amount to be emitted.

If the image shift is downward, X
By activating the shaft shift driving device 15 to rotate the transparent plates 5 and 8 on both inner sides in the counterclockwise direction in FIG. 5, the image shift can be eliminated.

If the image is shifted to the left or right, the Y-axis shift device 16 may be operated to rotate the transparent plates 5 and 8 on both inner sides around the Y-axis center in FIG. And when there is a complex shift in the left-right direction, the X-axis shift drive device 15 and the Y-axis shift device 16 are operated to move the transparent plates 5 and 8 on both inner sides around the X-axis center and the Y-axis center. If it is rotated, the displacement of the image can be eliminated.

Of the plurality of liquid crystal projectors, the rotation direction and the rotation amount (rotation angle) of both transparent plates 5 and 8 in each projector are finely adjusted before shipping and stored with optimum values in the storage means. According to the data stored in the storage means, the both transparent plates 5 and 8 are rotated in accordance with the optimum value for each projector, whereby the position of the image incident on the projection lens can be adjusted for each projector.

Although the angle of the light of the image projected from each projector differs for each projector, the rotation direction and the amount of rotation of the transparent plate 9 around the X-axis center and the Y-axis center for each projection lens of each projector are preset. Before shipment, the optimum values of the rotation direction and the rotation amount of the transparent plate 9 are finely adjusted, and these data are recorded in the storage means in advance.

In each projector, light modulation of each pixel is sequentially performed by each liquid crystal light valve of RGB, and images are sequentially incident on the liquid prism 1 on the rear side. Then, the X-axis tilt driving device 40 and the Y-axis tilt driving device 41 are provided for each pixel.
By driving and based on the data recorded in the storage means, the light of the pixel projected from the projection lens can be accurately emitted toward the corresponding pixel.

That is, by operating the X-axis shift driving device 15 and the Y-axis shift device 16 or one of them to rotate the transparent plates 5 and 8 on both inner sides to the optimum values stored in the storage means, each projector. It is possible to eliminate the displacement of the position of the image incident on the projection lens in
In addition, by activating the X-axis tilt drive device 40 and the Y-axis tilt drive device 41, the emission direction of the light of each pixel of the image incident on the projection lens in each projector is accurately emitted in the direction corresponding to each pixel. Therefore, it is not necessary to finely adjust the angle and the like of each projector by the position adjusting mechanism of the optical stage.

Further, by operating the X-axis shift driving device 15 and the Y-axis shift device 16 or one of them to rotate the transparent plates 5 and 8 on both inner sides to the optimum values stored in the storage means, each color of each color is changed. The position of the image can be accurately located at the center of the projection lens, and the X-axis tilt drive device 40 and the Y-axis tilt drive device 41 are operated to display the image of each color at the position corresponding to each pixel of the projection lens. Since the light can be emitted accurately, it is not necessary to adjust the positions of the optical stage, the projection lens and the screen.

Therefore, as the motor for electrically adjusting the position of the image and the pixel, a small X-axis shift motor 2 having a small output enough to drive the two transparent plates 5 and 8 is used.
The small 1-axis and Y-axis shift motors 31 and the small X-axis tilt motors 46 with a small output that can drive one transparent plate 9.
Since the Y-axis tilt motor 56 and the Y-axis tilt motor 56 may be provided, a large-sized motor that drives an image position adjusting mechanism that supports the weight of the entire optical stage for adjusting the positions of the optical stage, the projection lens, and the screen is large. The projection display apparatus as a whole is smaller and lighter than when it is used.

Further, since the position adjustment of the image and the position adjustment of the pixel can be adjusted by the remote controller while looking at the screen, the adjustment can be easily performed.

In addition, the transparent plate 5.8 which is the result of the adjustment
The optimum values of the rotation direction and the rotation amount of the transparent plate 9 and the optimum values of the rotation direction and the rotation amount of the transparent plate 9 are stored in the storage unit. Therefore, these optimum values are read and the X-axis shift motor 21, the Y-axis shift motor 31, and the X-axis shift motor 31 By controlling the axis tilt motor 46 and the Y axis tilt motor 56, the image position and the pixel position can be automatically adjusted easily and accurately.

Another embodiment of the present invention shown in FIGS. 7 and 8 is
The configuration of the tilt drive device 62 is different from that of the above-described embodiment.

That is, the tilt drive device 62 comprises an X-axis tilt drive device 63 and a Y-axis tilt device 64.
The X-axis tilt drive device 63 includes an X-axis tilt lever 42 whose one end is fixed to the X-axis tilt ring 37 on the X-axis.
An X-axis tilt motor 46 supported on the Y-axis tilt ring 38 via a bracket 45, and an X-axis tilt motor 4
A screw 66 connected to 6 via a coupling 65,
A nut 6 that is screwed into the screw 66 so as to be able to move forward and backward and that receives the free end portion of the X-axis tilt lever 42 from one direction.
7, a rotation stopper 69 that protrudes into a groove 68 formed on one side of the nut 67 so as to extend in the axial direction thereof and prohibits rotation of the nut 67, and the X-axis tilt lever 4
2 and a spring 47 for pressing the nut 67 against the nut 67.

When the X-axis tilt motor 46 of the X-axis tilt drive device 63 is rotated in one direction, the nut 67 moves forward in the axial direction without rotation by the rotation stopper 69, and the X-axis tilt lever 42 is freely moved. When the end is pushed and rotated in a direction away from the X-axis tilt motor 46, and the X-axis tilt motor 46 is rotated in the opposite direction, the nut 67 retracts in the axial direction, and the spring 47 causes the X-axis tilt lever 42 to move. The free end is pushed and rotated in a direction approaching the X-axis tilt motor 46.

Further, since the rotation stoppers 69 are received at both ends in the axial direction of the groove 68 formed in the nut 67, the advance / retreat region of the nut 67 is limited, whereby the X-axis tilt lever 42 and the X-axis tilt lever 42 are tilted. The rotation range of the ring 37 and the transparent plate 9 about the X-axis center is limited to a certain range around a reference position where the transparent plate 9 is parallel to the transparent plate 4 on the outer side of the rear liquid prism 2. .

As shown in FIG. 8, the Y-axis tilt device 64 includes a Y-axis tilt lever 52 having one end fixed to the Y-axis tilt ring 38 and a bracket 55 on the lens barrel 3 on the Y-axis. The Y-axis tilt motor 56 supported through the screw 70, the screw 70 connected to the Y-axis tilt motor 56 via the coupling 69, and the screw 70 screwed so as to be able to advance and retract.
A nut 71 that receives the free end portion of the Y-axis tilt lever 52 from one direction and a groove 72 that is formed on one side portion of the nut 71 so as to extend in the axial direction of the nut 71, and prohibits rotation of the nut 71. And a spring 57 for pressing the Y-axis tilt lever 52 against the nut 71.

Further, since the rotation stoppers 73 are received at both ends in the axial direction of the groove 72 formed in the nut 71, the advance / retreat region of the nut 71 is limited, whereby the X-axis tilt lever 42 and the Y-axis tilt lever 42 are tilted. Ring 38, X
The rotation range of the axis tilt ring 37 and the transparent plate 9 about the Y-axis center is limited to a certain range around a reference position where the transparent plate 9 is parallel to the transparent plate 4 outside the rear liquid prism 2. ing.

Since the other constructions, functions and effects of this embodiment are the same as those of the above-mentioned one embodiment, description thereof will be omitted to avoid duplication, but of course, in this embodiment, the shift drive device. It is possible to deform or modify 14 in the same manner as the tilt drive device 62.

Further, in this embodiment, the nut 67
72 receives the X-axis tilt lever 32 or the Y-axis tilt lever 42.
X-axis tilt lever 32 or Y-axis tilt lever 42
You may make it support so that it can slide and rotate.

In each of the above embodiments, the two liquid prisms 1 and 2 are used to rotate the transparent plates 5 and 8 inside the liquid prisms 1 and 2 so that the optical axes move in parallel.
That is, the shift is realized, but both liquid prisms 1 and 2
By rotating the transparent plates 4 and 9 on the outside of the
A parallel movement of the optical axis, that is, a shift can be realized.

In each of the above embodiments, the optical plate is deflected, that is, tilted or tilted by rotating the transparent plate 9 on the outer side of the front liquid prism 2, but the other three transparent plates are transparent. Any one of the plates 4, 5 and 8 can be rotated, or the transparent plates 4 and 5 (or 8) on both sides of any one of the two liquid prisms 1 and 2 (or 2) can be rotated.・ 9) is rotated in the opposite direction in synchronization with each other, one liquid prism is used to rotate one of the transparent plates, or one liquid prism is used to synchronize both transparent plates in the opposite directions. Even if you rotate it, the optical axis is deflected,
That is, tilting or tilting can be realized.

However, as in each of the above embodiments, 2
Using one liquid prism 1 and 2
The transparent plates 5 and 8 on the inner side of the liquid prism 2 are driven to realize the shift, and the transparent plate 9 on the outer side of either one of the liquid prisms 2 (or 1) is realized.
The method of driving (or 4) to achieve the tilt is the most convenient in terms of making the pixel position adjusting mechanism compact and simplifying its configuration, and further, reducing the amount of liquid in the liquid prism to reduce the weight. It is advantageous.

Further, in the above-described embodiment, motors (X-axis shift motor 21, Y-axis shift motor 3) are used as drive sources for the shift drive unit 14 and the tilt drive units 39 and 62.
1, the X-axis tilt motor 46, and the Y-axis tilt motor 56) are used, but a solenoid may be used instead of them.

[0064]

As described above, according to the present invention, two liquid prisms are provided on the optical path between the light valve and the projection lens, and the inner transparent plates of both liquid prisms facing each other are arranged in the same direction. A drive mechanism for shifting that is driven in synchronization,
A tilting drive mechanism that rotationally drives the transparent plate outside one of the liquid prisms, and a unit that detects and stores the rotation direction and the rotation amount of each transparent plate from the reference position. Therefore, by driving the inner transparent plates of the two liquid prisms facing each other in synchronization with each other in the same direction by the shift driving mechanism, the incident optical axis can be translated and emitted. Thereby, the position where the image formed by the light valve enters the projection lens can be adjusted accurately. As a result, it is not necessary to adjust the position of the entire projector in order to adjust the position of the pixels of the image projected from the projection lens, so a large-scale mechanism for adjusting the position of the heavy projector is not required, and The mold display device can be made small, compact, and lightweight. In particular, compared to the conventional example in which an electric position adjusting mechanism is used to adjust the position of the entire projector, it is not necessary to use a powerful and large-sized motor for moving the entire projector, and the output is small enough to drive two transparent plates. Since it is sufficient to use two small motors and two small motors with a small output that can move one transparent plate, the projection display device can be made smaller, more compact, and lighter in weight. You can

Further, by storing the optimum control values of the shift drive mechanism and the tilt drive mechanism in the storage means at the time of adjustment before shipment, the shift drive mechanism and the tilt drive mechanism can be easily adjusted to the optimum values after shipment. It is possible to display a high-quality image without color shift.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a liquid crystal projector to which the present invention is applied.

FIG. 2 is a side view of an embodiment of the present invention.

3 is a vertical cross-sectional view taken along the line AA of FIG.

FIG. 4 is a schematic diagram at a reference position according to an embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining a shift action of the embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating the tilting action of the embodiment of the present invention.

FIG. 7 is a side view of another embodiment of the present invention.

8 is a vertical cross-sectional view taken along the line BB of FIG.

FIG. 9 is a schematic diagram showing a configuration of a conventional liquid crystal projector.

FIG. 10 is a schematic diagram showing a configuration of a projection type image display device using a plurality of projectors.

FIG. 11 is a schematic diagram showing a configuration of a projection-type image display device using a plurality of projectors.

[Explanation of symbols]

 1, 2 Liquid prism 3 Lens barrel 4, 5, 8, 9 Transparent plate 14 Shift drive device 15 X-axis shift drive device 16 Y-axis shift drive device 17 X-axis shift lever 18 Partial gear wheel 19 Worm 25 Photo interrupter 26 Sensor lever 27 Y-axis shift lever 28 Partial gear 29 Worm 39 Tilt drive device 40 X-axis tilt device 41 Y-axis tilt device 35 Photointerrupter 36 Sensor lever 42 X-axis tilt lever 43 Partial gear 50 Photointerrupter 51 Sensor lever 52 Y-axis tilt lever 53 Partial Gear 54 Worm 60 Photointerrupter 61 Sensor Lever 62 Tilt Drive Device 63 X-Axis Tilt Device 64 Y-Axis Tilt Device 66 Screw 67 Nut 71 Screw 72 Nut

Claims (3)

[Claims]
1. A shift drive mechanism, wherein two liquid prisms are provided on an optical path between a light valve and a projection lens, and inner transparent plates of both liquid prisms facing each other are driven in synchronization in the same direction. A liquid crystal display device, comprising: a tilt drive mechanism that rotationally drives a transparent plate outside one of the liquid prisms; and a unit that detects and stores a rotation direction and a rotation amount of each transparent plate from a reference position. Pixel position adjustment mechanism for projection display devices.
2. A lever provided with a lens barrel for holding the both liquid prisms, and one or both of the shift drive mechanism and the tilt drive mechanism fixed to a transparent plate rotatably supported by the lens barrel. A partial gear fixed to the free end of the lever, a worm that meshes with the partial gear, a motor that drives the worm, and a spring that biases the lever in one direction. Item 2. A pixel position adjustment mechanism for a projection display device according to item 1.
3. A lens barrel for holding the both liquid prisms is provided, and one or both of the shift drive mechanism and the tilt drive mechanism are fixed to a transparent plate and rotatably supported by the lens barrel. Lever, a nut that receives the lever from one side in the rotation direction, a screw into which the nut is screwed so as to be able to advance and retract, a motor that drives the screw, and a spring that presses the lever against the nut. The pixel position adjusting mechanism for a projection display device according to claim 1, wherein
JP17405294A 1993-10-26 1994-07-26 Picture element position adjustment mechanism of projection type display device Pending JPH07175018A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP5-267414 1993-10-26
JP26741493 1993-10-26
JP17405294A JPH07175018A (en) 1993-10-26 1994-07-26 Picture element position adjustment mechanism of projection type display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17405294A JPH07175018A (en) 1993-10-26 1994-07-26 Picture element position adjustment mechanism of projection type display device

Publications (1)

Publication Number Publication Date
JPH07175018A true JPH07175018A (en) 1995-07-14

Family

ID=26495793

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17405294A Pending JPH07175018A (en) 1993-10-26 1994-07-26 Picture element position adjustment mechanism of projection type display device

Country Status (1)

Country Link
JP (1) JPH07175018A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7114811B2 (en) 2003-10-06 2006-10-03 Seiko Epson Corporation Optical assembly and projector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7114811B2 (en) 2003-10-06 2006-10-03 Seiko Epson Corporation Optical assembly and projector

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