JP6646964B2 - Projection display device and projection display system - Google Patents

Description

  The present invention relates to a projection display device and a projection display system.

  In a projector using a plurality of liquid crystal panels, it is necessary to correct a so-called color shift, which is a shift of a projection position of light from each of the liquid crystal panels when light from the plurality of liquid crystal panels is projected on a screen. As a technique for correcting this color shift, there is a technique described in Patent Document 1.

  Patent Literature 1 discloses a projection display system including a projector and a digital camera that captures an image projected on a screen. In the projection display system described in Patent Literature 1, an image of a test pattern formed by a liquid crystal panel serving as a reference for color misregistration is displayed at the upper right of the projection area and the image is captured. Next, an image of the test pattern formed by the liquid crystal panel to be adjusted is displayed and similarly imaged. A technique for correcting color misregistration from these imaging results is disclosed.

JP 2011-247976 A

  Here, besides the method of using only one projector to display the projection image, a stack projection in which the projection images from the two projectors are overlapped, or the two projection images are connected on the left and right to form a larger projection image There is a usage method such as multi-projection. In general, when only one projector is used or in the case of stack projection, it is preferable that the color misregistration correction is particularly performed at the center of the projected image. However, in the case of multi-projection, it is not the center of the projected image, but It is preferable that color misregistration correction is particularly performed at the end.

  That is, the area in which the color misregistration is detected and the projection image needs to be corrected differs depending on the usage of the projector. For this reason, it is preferable that the projector can select an area for correcting a color shift or the like of a projected image.

  However, Patent Document 1 mentioned above has a fixed positional relationship between the projector and the digital camera, and does not disclose a technology that enables selection of an area for correcting a projection image.

  Therefore, an object of the present invention is to provide a projection display device and a projection display system capable of selecting an area for correcting a projection image.

In order to achieve the above object, the projection display device of the present invention is
A projection display device that projects light on a projection surface using a projection optical system,
A first light modulation element;
A second light modulation element;
An image sensor having a plurality of pixels ;
An imaging optical system for guiding the light from an area smaller than the projection area to the imaging element as an imaging area in the projection area in which the projection display device can project the projection target surface ,
A first moving means for moving the position of the imaging area by moving the imaging optical system,
Control means for controlling the first light modulation element and the second light modulation element,
An image displayed on the projection surface by light from the first light modulation element is a first projection image, and an image displayed on the projection surface by light from the second light modulation element is a first projection image. 2, when the image of the first projection image and the image of the second projection image formed on the imaging device by the imaging optical system are larger than the respective pixels of the imaging device. big,
Before SL control means, a light receiving intensity of each pixel of the image sensor at the time of imaging the first projection image Ri by said imaging optical system and imaging the second projection image by the imaging optical system The second light modulation element is controlled so that the difference between the light receiving intensities of the respective pixels of the imaging element at the time of the image projection becomes small, and the second projection image of the second projection image with respect to the first projection image on the projection target surface is formed. position Ru by changing the,
It is characterized by the following.

  According to the present invention, it is possible to provide a projection display apparatus and a projection display system capable of selecting a region for correcting a projection image.

Diagram showing that the imaging means shifts Diagram showing shift unit The figure which shows a projection optical system unit Diagram for explaining the color misregistration correction method The figure explaining the method of specifying the position of the pixel of the light modulation element for green The figure explaining the method of specifying the position of the pixel of the red light modulation element The figure explaining the image generation device inside the projection display device Diagram for explaining an image generation area in an image generation device Diagram explaining specifying important adjustment points Diagram showing the configuration of the projection display system

  Preferred embodiments of the present invention will be illustratively described below with reference to the accompanying drawings. However, the relative arrangement of the components described in this embodiment and the like should be appropriately changed according to the configuration of the apparatus to which the present invention is applied and various conditions. That is, the present invention is not limited to the embodiments described below, and various modifications and changes can be made within the scope of the gist.

[First Embodiment]
(Configuration of projection display device)
The configuration of a projector (projection display device) 1 and shift movement of an imaging optical system unit (imaging optical system) 4 according to each embodiment of the present invention will be described with reference to FIG.

  In FIG. 1, reference numeral 2 denotes an image pickup device, and reference numeral 4 denotes an image pickup optical system unit that guides light from a screen (projected surface) to the image pickup device 2. Reference numeral 3a denotes a first shift unit (first moving unit) that supports the imaging optical system unit 4 so as to be movable in a direction intersecting with the optical axis of the imaging optical system unit 4 (a surface direction orthogonal to the optical axis). It is. Reference numeral 101 denotes shift control means (movement control means) for controlling the first shift unit 3a.

  Reference numeral 5 denotes a projection optical system unit (projection optical system) that guides light from a liquid crystal panel (light modulation element) 11 described later to a screen. 3b is a second shift unit (supporting means, second moving means) for supporting the projection optical system unit 5 so as to be movable in a direction intersecting with the optical axis of the projection optical system unit (a surface direction orthogonal to the optical axis). It is.

  11G is a liquid crystal panel for green (first light modulation element), 11R is a liquid crystal panel for red (second light modulation element), and 11B is a liquid crystal panel for blue (third light modulation element). ). In each embodiment of the present invention, 11G, 11R, and 11B are collectively referred to as a liquid crystal panel 11. 100 is a panel control means (control means) for controlling the liquid crystal panel 11. Reference numeral 102 denotes a combining prism (color combining unit) that combines the light from the liquid crystal panel 11 and guides the combined light to the projection optical system unit 5.

  Reference numeral 106 denotes a correction image to be displayed when color misregistration correction described later is performed. The correction image 106 includes a first correction image (first projection image) 106G and a second correction image (second image). Projected image 106R). Note that the positions of the first correction image 106G and the second correction image 106R are slightly shifted before correction due to color shift as described later.

  Next, the shift movement of the imaging optical system unit 4 will be described.

  As shown in FIGS. 1A, 1B, and 1C, the shift of the imaging optical system unit 4 changes the position of the imaging region 8 with respect to the projection region 7. In this embodiment, when the projection optical system unit 4 is not shifted as shown in FIG. 1A, the imaging area 8 is located at the center of the projection area 7. Then, the imaging optical system unit 4 shifts left and right from the state shown in FIG. 1A to the state shown in FIG. 1B or 1C.

  As described above, in the present embodiment, the imaging optical system unit 4 does not have an angle of view enough to capture the entire projection area 7 at one time, and the imaging area 8 is narrower than the projection area 7. That is, the imaging area in each embodiment of the present invention means an area on the projection surface where the imaging optical system unit 4 can image when the imaging optical system unit 4 is at a certain position.

  The first shift unit 3a is configured so that the imaging optical system unit 4 can image each area obtained by dividing the projection area 7 into a plurality of areas. Thereby, the imaging optical system unit 4 can image the entire projection area 7. That is, since the imaging optical system unit 4 shifts to the left and right, a region connecting the imaging regions 8 at a plurality of positions is the same as the projection region 7 or is wider than the projection region 7. Furthermore, the imaging optical system unit 4 can move so that the position where the first correction image 106G and the second correction image 106R are displayed can be imaged.

  The above-described projection area 7 is an area on a projection surface such as a screen where the projection optical system unit 5 can project light from the liquid crystal panel 11. In other words, it is a rectangular image reflected on the screen when all the light illuminating the liquid crystal panel 11 is projected on a projection surface such as a screen. When the projection optical system unit 5 is in a predetermined state, the projection area 7 is an area of the screen where an image of the maximum size (such as a white image on the entire surface) that the projector 11 can project onto the screen is displayed. It can also mean. In other words, the projection area 7 is an area obtained by multiplying the maximum area where the illumination area on the liquid crystal panel 11 can be formed by the magnification by the projection optical system unit 5.

  The above-described photographing area 8 is an area of the projection surface where the imaging optical system unit 4 can capture an image.

(Structure of shift unit)
Next, the configuration of the first shift unit 3a and the second shift unit 3b will be described with reference to FIG. In this embodiment, the first shift unit 3a and the second shift unit 3b are collectively referred to as a shift unit 3. In FIG. 2, the Z-axis direction is a direction parallel to the optical axis of the imaging optical system unit 4 or the projection optical system unit 5, and the X-axis direction is orthogonal to the Z-axis direction and parallel to the installation surface of the projector 1. Direction. The Y-axis direction is a direction orthogonal to the Z-axis direction and the X-axis direction.

  First, the movement in the X-axis direction will be described. The imaging optical system unit 4 and the projection optical system unit 5 are inserted into openings provided in the X-direction moving plate 33 and a later-described Y-direction moving plate 37, and are fastened with four screws. Supported by In this embodiment, the imaging optical system unit 4 and the projection optical system unit 5 are configured to be detachable from the shift unit 3. Of course, one of the imaging optical system unit 4 and the projection optical system unit 5 may be configured to be detachable from the shift unit 3, or both may be fixed to the shift unit 3. .

  When the X-direction drive motor 31 is driven, the X-direction moving plate 33 moves in the X direction via the X-direction drive gear unit 32. Thereby, the imaging optical system unit 4 and the projection optical system unit 5 move in the X-axis direction. When moving in the X-axis direction, the X-direction position detection linear sensor 34 (first position detection means) detects the positions of the imaging optical system unit 4 and the projection optical system unit 5 in the X-axis direction. .

  Next, the movement in the Y-axis direction will be described. When the Y-direction drive motor 35 is driven, the Y-direction moving plate 37 moves in the Y-direction via the Y-direction drive gear unit 36. Thereby, the imaging optical system unit 4 and the projection optical system unit 5 move in the Y-axis direction. When moving in the Y-axis direction, the Y-direction position detection linear sensor 38 (second position detection means) detects the positions of the imaging optical system unit 4 and the projection optical system unit 5 in the Y-axis direction. .

  That is, the projector 1 uses the X-direction position detection linear sensor 34 and the Y-direction position as position acquisition means for acquiring the position of the projection optical system unit 5 with respect to the second shift unit 3b (the position of the optical axis of the projection optical system unit 5). A detection linear sensor 38 is provided.

  As described above, the imaging optical system unit 4 and the projection optical system unit 5 are supported by the shift unit 3 such that the imaging optical system unit 4 and the projection optical system unit 5 can be moved in a direction intersecting each optical axis (a plane direction orthogonal to the optical axis). Note that each of the above components included in the shift unit 3 is stored and held in the shift base plate 39.

  Here, when performing the above-described stack projection or multi-projection, it is required that the projection image can be finely adjusted. Specifically, adjustment in units smaller than the pixel width of one pixel of the liquid crystal panel 11 is required. Therefore, the shift unit 3 may move the imaging optical system unit 4 (the optical axis of the imaging optical system unit 4) by a distance smaller than the width of a predetermined pixel among the plurality of pixels included in the green light modulation element 11G. It is configured as possible. In the present embodiment, the width of one pixel of the liquid crystal panel 11 is 8 μm, and the shift unit 3 can perform fine adjustment in increments of 4 μm.

(Configuration of projection optical system unit)
Next, the configuration of the projection optical system unit 5 will be described with reference to FIG. In addition, each axial direction in FIG. 3 has the same definition as the above-described axial direction in FIG.

  The projection optical system unit 5 shown in FIG. 3 is configured to enable focusing and zooming.

  At the time of focusing, the focus drive motor 52 is driven based on a signal from the lens control board 51, and the driving force is transmitted to the cylindrical member holding the focus lens unit that contributes to focusing by the focus drive gear 54. As a result, the focus lens unit moves in the optical axis direction, and focusing is performed. At the time of focusing, the position of the focus lens unit in the optical axis direction (focus position) can be detected by combining the photo interrupter 53 for detecting the number of rotations of the focus drive motor 53 and the position switch 55. It is possible.

  On the other hand, at the time of zooming, the zoom drive motor 56 is driven based on a signal from the lens control board 51, and the driving force is transmitted by the zoom drive gear 57 to the cylindrical member holding the zoom lens unit contributing to zooming. . As a result, the zoom lens unit moves in the optical axis direction, and zooming is performed. During zooming, the position of the zoom lens unit in the optical axis direction (zoom position) can be detected by the zoom linear sensor 58.

(Color shift correction method)
Next, a method of correcting color misregistration in the present embodiment will be described with reference to FIGS.

  In FIG. 4A, reference numerals 601 to 625 denote one pixel of the image sensor 2, respectively.

  In FIG. 4B, reference numeral 630 denotes projection of only light from a predetermined one of a plurality of pixels included in the liquid crystal panel 11G for green formed on the image sensor by the imaging optical system unit 4 onto the screen. 5 is an image of the first correction image 106G displayed by. 630 is also an image of the second correction image 106R displayed by projecting only light from a predetermined one of the plurality of pixels included in the red liquid crystal panel 11R onto the screen.

  As shown in FIGS. 4A and 4B, an image of the first correction image 106G and an image of the second correction image 106R formed on the image sensor by the imaging optical system unit 4 are image-captured. It is larger than the pixel of element 2. In other words, when the imaging optical system unit 4 is assumed to be a projection optical system on the projection target surface, one pixel of the image sensor 2 displayed on the projection target surface has the first correction image 106G and the second correction image 106G. Smaller than the image for use 106R.

  The reason that the above relationship can be realized is as follows. That is, as shown in FIG. 1 described above, the imaging region 8 is made narrower than the projection region 7, and each of the plurality of regions obtained by dividing the projection region 7 is set as the imaging region 8. Thereby, as compared with the case where the entire projection area 7 is set as one imaging area 8, the size of one pixel of the imaging element 2 on the projection surface when the imaging optical system unit 4 is assumed to be the projection optical system This is because the height can be reduced.

(Detection of position of image 630G)
FIG. 5A shows the result of capturing the first correction image 106G described above. Specifically, a case where the image 630G is formed at the lower left in the image sensor 2 is shown. In the case of the imaging result shown in FIG. 5A, the light receiving intensity of each pixel of the image sensor 2 is as shown in FIG. In FIG. 5B, the vertical axis indicates the relative light receiving sensitivity when the light receiving intensity is 1 when light is incident on the entire pixel of the image sensor 2, and the horizontal axis is FIG. 3A shows the position of each pixel of the image sensor 2 shown in FIG.

  As shown in FIG. 5B, by capturing the first correction image 106G, it can be seen that the image 630G is formed at the lower left in the image sensor 2. In the present embodiment, the position of the image 630G is set as a reference position for color shift correction.

(Detection of Position of Image 630R)
By the above operation, the position serving as the reference for the color misregistration correction was found. Next, a description will be given of how far the pixels of the liquid crystal panel 11R for red are displaced from the reference position.

  FIG. 6A shows a result of capturing the above-described second correction image 106R. Specifically, a case where the image 630R is formed on the upper right of the image sensor 2 is shown. In the case of the imaging result shown in FIG. 6A, the light receiving intensity of each pixel of the image sensor 2 is as shown in FIG. In FIG. 6B, the vertical axis indicates the relative light receiving sensitivity when the light receiving intensity is 1 when light is incident on the entire pixel of the image sensor 2, and the horizontal axis is FIG. 3A shows the position of each pixel of the image sensor 2 shown in FIG.

  As shown in FIG. 6B, by capturing the second correction image 106R, it can be seen that the image 630R is formed at the upper right of the image sensor 2.

  The correspondence between the image 630G and the liquid crystal panel 11G for green is the same as the correspondence between the image 630R and the liquid crystal panel 11R for red. Specifically, the pixel corresponding to the image 630G is a pixel at the upper left corner of the liquid crystal panel 11G for green, and the pixel corresponding to the image 630R is also a pixel at the upper left corner of the liquid crystal panel 11R for red. .

  As described above, even when an image is formed by light from pixels located at the same position on the liquid crystal panel 11, if a plurality of light modulation elements are used, errors in manufacturing and especially the peripheral area of the projection area 7 may occur. The position is displaced due to magnification aberration or the like generated in the above, so-called color misregistration occurs.

(Method of Positioning Image 630G and Image 630R)
Next, a method of aligning the image 630G and the image 630R, that is, a method of correcting color misregistration will be described with reference to FIGS.

  In FIG. 7, reference numeral 11 denotes the above-described liquid crystal panel, and reference numeral 13 denotes a light irradiation area of the liquid crystal panel 11 to which light from a light source provided in the projector 1 is irradiated. Reference numeral 12 denotes an image generation area in which pixels for generating an arbitrary projected image displayed on the screen are provided.

  In FIG. 8, reference numeral 121 denotes a position of the image generation area 12 (first position), and reference numeral 122 denotes a position of the image generation area 12 different from the position 121 (second position). As shown in FIG. 9, the image generation area 12 may be at the position 121 or the position 122 as long as it is within the light irradiation area 13, and can be moved as appropriate.

  In this embodiment, the color misregistration correction is performed by adjusting the position of the image generation area 12 as shown in FIG. In the case of the imaging results shown in FIGS. 5A and 6A described above, if the image 630R is moved in the lower left direction, it can be seen that the image coincides with the image 630G.

  Therefore, panel control means 100 is an area used for displaying a projected image based on an image signal input to projector 1 among the pixel area provided with a plurality of pixels on liquid crystal panel 11R for red. , And controls the position of the image generation area. Specifically, the image generation area 12 is moved from the position 121 to the position 122 on the liquid crystal panel 11R for red. That is, in the present embodiment, the panel control unit 100 determines the intensity of light from the first correction image 106G and the second correction image 106R received by each of the plurality of pixels included in the image sensor 2. Based on this, the liquid crystal panel 11R for red is controlled.

  As described above, it is possible to correct the color misregistration. In the present embodiment, the case where the red color shift is corrected with reference to the green color has been described as an example, but in addition, the blue color shift may be corrected. Further, the reference for color misregistration correction does not necessarily need to be green.

(Adjustment of Position of First Correction Image 106G and Second Correction Image 106R)
As described above, the area where it is necessary to detect a color shift and correct the projected image differs depending on how the projector is used, such as stack projection or multi-projection. For this reason, it is preferable that the projector can select a region for correcting the projection image.

  Therefore, in the present embodiment, the panel control unit 100 controls the liquid crystal panel 11 so that the positions of the first correction image 106G and the second correction image 106R on the projection surface change. Accordingly, it is possible to realize a projection display device capable of selecting a region for correcting a projection image.

  The panel control means 100 performs the first correction for the first correction image on the projection surface based on the signal from the position specifying means for specifying the position at which the first correction image 106G and the second correction image 106R are displayed. The positions of the image 106G and the second correction image 106R may be adjusted.

  The position specifying means is, specifically, a remote controller (hereinafter, remote controller) 10 shown in FIG. The projector 1 is configured to be able to receive a signal from the remote controller 10, and the panel control unit 100 is configured to perform the first correction image 106 G and the second correction image based on the signal from the remote controller 10. The position of 106R is adjusted.

  When the user operates the cross key provided on the remote controller 10, the position designation cursor 9 in the projection area 7 moves in conjunction with the operation of the user. This allows the user to select an area in which the projection image is particularly desired to be corrected.

  In this embodiment, the projector 1 and the remote controller 10 are separate bodies. However, the present invention is not limited to this, and an operation unit having the same function as the remote controller 10 is provided on the top plate of the projector 1. You may. The operation unit referred to here is a cross key or button operable by a user, a touch panel, or the like.

  That is, the projector 1 only needs to be able to communicate with the position specifying unit that can specify the positions where the first correction image 106G and the second correction image 106R are displayed. This position designation means may be separate from the projector 1 like the remote controller 10 described above, or may be integrated with the projector 1 like the operation unit.

  As described above, according to the present embodiment, it is possible to provide a projection display apparatus and a projection display system capable of selecting a region for correcting a projection image.

  Note that the number of pixels of the image sensor 2 is smaller than the number of pixels of the liquid crystal panel 11. Even with such an image sensor 2, color shift correction can be performed by dividing the projection area 7 into a plurality of areas and capturing an image. In other words, instead of imaging the entire projection area 7 with the imaging optical system unit 4, all the pixels of the image sensor 2 are concentrated on a part of the projection area 7. That is, the more the number of divisions of the projection area 7 is increased, the more accurate the correction of the color shift can be performed.

  Further, according to the present embodiment, since the imaging element 2 does not need to image the entire projection area 7, it does not need to have the same size and the same number of pixels as the liquid crystal panel 11, and is smaller and less costly. The projection image can be corrected using the image sensor.

[Second embodiment]
When projecting an image on a screen using a projector, the user must adjust the projector in consideration of the distance from the projector to the screen, the position on the screen where the user wants to display the projected image, the size of the projected image, etc. Do. Specifically, position adjustment by shifting the projection optical system unit 5 in the X and Y directions, adjustment of the size of the projected image by zooming and focusing, and focusing are performed.

  When the user needs to adjust the imaging optical system unit 4 when performing the color misregistration correction described in the first embodiment from the state where the user has already adjusted the color misregistration, it takes time to correct the color misregistration. This increases the burden on the user. Therefore, in the present embodiment, by performing the following operations, the time required for color misregistration correction is reduced, and the burden on the user is further reduced.

  As shown in FIG. 2 described above, the shift unit 3 includes the X-direction position detection linear sensor 34 and the Y-direction position detection linear sensor 38, so that the user can adjust the optical axis of the projection optical system unit 5 in the X direction. And the position in the Y direction can be detected. Further, as shown in FIG. 3 described above, the projection optical system unit 5 includes the photo interrupter 53 and the position switch 55, so that the user can detect the adjusted focus position. Further, since the projection optical system unit 5 includes the zoom linear sensor 58, the user can also detect the adjusted zoom position. The size of the projection area 7 can be acquired from the zoom position, and the distance from the projector 1 to the screen can be acquired from the focus position.

  As described above, the user's adjustment result regarding the projection optical system unit 5 can be detected from the configurations illustrated in FIGS. 2 and 3. This detection result is transmitted to a lens adjustment unit that controls the focus position and the zoom position of the imaging optical system unit 4, and a shift control unit 101 that controls the first shift unit 3a. The lens adjustment unit and the shift control unit 101 automatically adjust the position of the optical axis of the imaging optical system unit 4 in the X and Y directions, the focus position, and the zoom position based on the received information. In other words, the lens adjustment unit adjusts the focal length and the focus position of the imaging optical system unit 4 based on the focal length and the focus position of the projection optical system unit 5.

  Specifically, the shift control unit 101 controls the shift lens unit 3a so that the position of the optical axis of the imaging optical system unit 4 and the position of the optical axis of the projection optical system unit 5 match in the X direction. Then, the lens control unit adjusts the focus position and the zoom position of the imaging optical system unit 4 based on the following information. That is, the size of the projection area 7, that is, the sizes of the first correction image 106G and the second correction image 106R, and the distance from the projector 1 to the screen. This makes it possible to reduce the time required for color misregistration correction and to further reduce the burden on the user.

  That is, in the present embodiment, the projector 1 includes the X-direction position detection linear sensor 34 and the Y-direction position detection linear sensor 38 as position acquisition means for acquiring the position of the projection optical system unit 5 with respect to the second shift unit 3b. I have. Then, the first shift unit 3a moves the imaging optical system unit 4 based on the result obtained by the position obtaining unit.

  Thereby, the position of the optical axis of the imaging optical system unit 4 in the X direction can be automatically made to coincide with the position of the optical axis of the projection optical system unit 5, and the projection is more accurately performed while reducing the burden on the user. Image correction can be performed.

  The above-described zoom position will be described in more detail as follows. Of the plurality of lens units included in the imaging optical system unit 4 and the projection optical system unit 5, a position in the optical axis direction of a lens unit that moves so as to change an interval between adjacent lens units during zooming is defined as a zoom position. Then, a position in the optical axis direction of a lens that moves during focusing among the lenses included in the plurality of lens units is defined as a focus position. Then, the above-described lens adjustment unit adjusts the zoom position and the focus position of the imaging optical system unit 4 based on the zoom position and the focus position of the projection optical system unit 5.

(Modification of this embodiment)
As described above, when a projected image is displayed using only one projector, it is preferable that color misregistration correction is particularly performed at the center of the projected image. In this state, it is preferable that the first correction image 106G and the second correction image 106R used for color misregistration correction be displayed at the center of the projection area 7.

  Therefore, the fact that the projector 1 displays the first correction image 106G and the second correction image 106R at the center of the projection area 7 is stored in advance, and the information is stored in the lens control unit and the shift control unit. 101 may be transmitted.

  Accordingly, the lens control unit and the shift control unit 101 adjust the position of the optical axis of the imaging optical system unit 4 in the X direction and the Y direction, the focus position, and the zoom position so as to be suitable for color shift correction at the center of the projected image. It can be adjusted automatically. Even with such a configuration, it is possible to reduce the time required for color misregistration correction and to further reduce the burden on the user.

  Of course, the color misregistration correction may be performed at an end or the like other than the center of the projection area 7. That is, the region in which the projector 1 performs the correction of the projection image, which is stored in advance, can be selected. Thus, it is possible to provide a projection display device capable of selecting a region for correcting a projection image.

[Third embodiment]
In each of the embodiments described above, the configuration of the projection display device is exemplified. However, the present invention is not limited to the projection display device, and may be a projection display system as shown in this embodiment. .

  FIG. 10 is a diagram showing a configuration of a projection system (projection display system) 105 as a third embodiment of the present invention.

  As shown in FIG. 10, the projection system 105 includes a projector 1 as a projection display device, a camera (imaging device) 103 that is separate from the projector 1 and includes an imaging element 2 and a first shift unit 3a, It has.

  Reference numeral 104 denotes a control device such as a computer. In the present embodiment, the panel control means 100 is provided in the projector 1, but the control device 104 may have the panel control means 100. Further, the control device 104 may include the above-described position specifying means.

  Such a projection system 105 can also select a region for correcting the projected image, and can correct the projected image by performing the same operation as the color misregistration correction described in the first embodiment. .

[Other embodiments]
In each of the above-described embodiments, in order to correct color misregistration, only light from a predetermined one of a plurality of pixels included in the liquid crystal panel 11G for green is projected on the screen as the first correction image 106G. Capture the image displayed by. Further, as the second correction image 106R, an image to be displayed by projecting only light from a predetermined one of the plurality of pixels included in the liquid crystal panel 11R for red on the screen is captured.

  However, the present invention is not limited to this. If the image of the first correction image 106G formed on the imaging device 2 by the imaging optical system unit 4 is larger than the pixels of the imaging device 2, the first correction is performed. The image for use 106G may be the following image. That is, the first correction image 106G may be an image displayed by projecting light from a plurality of predetermined pixels of the plurality of pixels included in the green liquid crystal panel 11 onto a screen. Further, the first correction image 106G is preferably a rectangular image.

  Further, in FIG. 1 described above, the configuration in which the first correction image 106G is located at the center of the imaging region 8 is illustrated, but the positional relationship between the first correction image 106G and the imaging region 8 is appropriately determined. Adjustable.

  Note that the above point is the same for the second correction image 106R.

  Further, in each of the above-described embodiments, the configuration in which the imaging optical system unit 4 can be moved with a half distance of the pixel width of the liquid crystal panel 11 as one unit has been exemplified, but the present invention is not limited to this. Absent. The shift unit 3 only needs to be configured so that the first correction image 106G can move a distance smaller than the pixel width of the green light modulation element 11G. In other words, the shift unit 3 can move the imaging optical system unit 4 by a unit of a distance of a quarter of the pixel width of the liquid crystal panel 11 (2 μm in each embodiment of the present invention). Good.

  Further, in each of the embodiments described above, the configuration in which the imaging optical system unit 4 is shifted is disclosed, but the present invention is not limited to this. Instead of the imaging optical system unit 4, the projection optical system unit 5 may be shifted. That is, the projector 1 sets at least one of the projection optical system unit 5 and the imaging optical system unit 4 in a direction intersecting with the optical axis of the projection optical system unit 5 or the imaging optical system unit 4 (a surface direction orthogonal to the optical axis). What is necessary is just to be provided with the moving means which supports so that it can be moved. That is, the projector 1 only needs to include at least one of the above-described first shift unit 3a and second shift unit 3b.

  Further, in each of the above-described embodiments, the method of shifting the position of the image generation area 12 for correcting the color shift is used, but the present invention is not limited to this. For example, an optical element such as a flat glass may be provided between the liquid crystal panel 11 and the projection optical system unit 5, and the color shift may be corrected by adjusting the position and angle of the optical element. Further, color misregistration correction may be performed by electrically performing image processing. For the purpose of correcting the projection image other than the color misregistration correction, the imaging optical system unit 4 may be shifted and the projection area 7 may be divided into a plurality of areas for imaging.

  Further, the imaging optical system unit 4 may be configured to be detachable from the first shift unit 3a, and the projection optical system unit 5 may be configured to be detachable from the second shift unit 3b. That is, at least one of the imaging optical system unit 4 and the projection optical system unit 5 may be replaceable.

  Further, in each of the above-described embodiments, the imaging optical system unit 4 is moved in a direction perpendicular to the optical axis, but the present invention is not limited to this. For example, the image pickup optical system unit 4 and the image pickup device 2 may be integrated as an image pickup device, and these may be rotated to divide a projection area to pick up an image. Further, rotation and movement in a direction perpendicular to the rotation may be used in combination. Furthermore, instead of the imaging optical system unit 4, the imaging device 2 may be moved. That is, the first shift unit 3a may be a first moving unit that moves the position of the area where the imaging optical system that guides light from the projection surface to the imaging element can capture an image.

1 projector (projection display device)
2 Image sensor 3a First shift unit (first moving means)
4 Imaging optical system unit (imaging optical system)
11G Green liquid crystal panel (first light modulation element)
11R Liquid crystal panel for red color (second light modulation element)
100 Panel control means (control means)
106G First correction image (first projection image)
106R Second correction image (second projected image)

Claims (15)

A projection display device that projects light on a projection surface using a projection optical system,
A first light modulation element;
A second light modulation element;
An image sensor having a plurality of pixels;
An imaging optical system for guiding the light from an area smaller than the projection area to the imaging element as an imaging area in the projection area in which the projection display device can project the projection target surface,
First moving means for moving the position of the imaging region by moving the imaging optical system;
Control means for controlling the first light modulation element and the second light modulation element,
An image displayed on the projection surface by light from the first light modulation element is a first projection image, and an image displayed on the projection surface by light from the second light modulation element is a first projection image. 2, when the image of the first projection image and the image of the second projection image formed on the imaging device by the imaging optical system are larger than the respective pixels of the imaging device. big,
The control unit is configured to control the light receiving intensity of each pixel of the image sensor when the first projection image is captured by the imaging optical system, and the light reception intensity when the second projection image is captured by the imaging optical system. The second light modulating element is controlled so that the difference between the light receiving intensities of the respective pixels of the imaging element is reduced, and the position of the second projected image with respect to the first projected image on the projection surface is changed. Let
A projection type display device characterized by the above-mentioned. Further comprising a movement control means for controlling the first movement means,
The control unit is configured such that a position at which the first projection image and the second projection image are displayed is changed from a position designation unit that designates a position at which the first projection image and the second projection image are displayed. Controlling the first light modulation element and the second light modulation element so that the position is based on the signal of
The movement control unit controls the first movement unit based on a signal from the position designation unit so that the imaging optical system can capture the first projection image and the second projection image. Do
The projection type display device according to claim 1, wherein: The position specifying means is a remote controller,
The projection type display device according to claim 2, wherein: Support means for supporting the projection optical system that guides light from the first light modulation element and the second light modulation element to the projection surface ,
The first moving unit is configured so that the imaging optical system can image each area obtained by dividing the projection area into a plurality of areas,
The projection type display device according to claim 1, wherein: The first moving means supports the imaging optical system so as to be movable in a direction intersecting the optical axis of the imaging optical system,
The projection type display device according to claim 1, wherein: Support means for supporting the projection optical system that guides light from the first light modulation element and the second light modulation element to the projection surface,
The first moving means is configured such that the imaging optical system is detachable from the first moving means,
The support unit is configured such that the projection optical system is detachable from the support unit.
The projection type display device according to claim 5, wherein: The first moving unit is configured so that the imaging optical system can move a distance smaller than a width of a predetermined pixel among a plurality of pixels included in the first light modulation element.
7. The projection display device according to claim 5, wherein: The supporting unit is a second moving unit that supports the projection optical system so as to be movable in a direction intersecting with the optical axis of the projection optical system.
The projection type display device according to claim 6, wherein: Position acquiring means for acquiring the position of the optical axis of the projection optical system with respect to the second moving means,
The first moving unit moves the imaging optical system based on an acquisition result by the position acquiring unit,
The projection type display device according to claim 8, wherein: The optical axis direction of the imaging optical system and the projection optical system of the lens unit that moves so that the distance between adjacent lens units changes during zooming among the plurality of lens units included in the imaging optical system and the projection optical system. Is the zoom position,
Of the lenses included in the plurality of lens units, when a position in the optical axis direction of the imaging optical system and the projection optical system of a lens that moves during focusing is a focus position,
A lens adjusting unit that adjusts the zoom position and the focus position of the imaging optical system based on the zoom position and the focus position of the projection optical system,
The projection display device according to claim 1, wherein: The control unit is configured to control a position of an area used for displaying a projection image based on an image signal input to the projection display device, in a pixel area where a plurality of pixels are provided in the second light modulation element. Control the
The projection display device according to claim 1, wherein: The first projection image is an image displayed by projecting only light from a predetermined one of a plurality of pixels included in the first light modulation element onto the projection target surface,
The second projection image is an image displayed by projecting only light from a predetermined one of a plurality of pixels included in the second light modulation element onto the projection target surface,
The projection type display device according to claim 1, wherein: The number of pixels of the imaging element is smaller than the number of pixels of the first light modulation element and the second light modulation element,
The projection display device according to claim 1, wherein: Further comprising a third light modulation element,
When an image displayed on the projection surface by the light from the third light modulation element is a third projection image,
The second light modulation element and the control unit are configured to control the position of the first projection image, the second projection image, and the third projection image on the projection target surface such that a displacement between the first projection image, the second projection image, and the third projection image is reduced. Controlling the third light modulation element;
The projection type display device according to claim 1, wherein: A projection display device including a first light modulation element and a second light modulation element;
An imaging element having a plurality of pixels, and an imaging optical system that guides light from an area smaller than the projection area to the imaging element as an imaging area in a projection area in which the projection display device can project onto a projection surface; An imaging apparatus comprising: a first movement unit configured to move a position of the imaging region by moving an imaging optical system;
Control means for controlling the first light modulation element and the second light modulation element,
An image displayed on the projection surface by light from the first light modulation element is a first projection image, and an image displayed on the projection surface by light from the second light modulation element is a first projection image. 2, when the image of the first projection image and the image of the second projection image formed on the imaging device by the imaging optical system are larger than the respective pixels of the imaging device. big,
The control means includes: a light-receiving intensity of each pixel of the imaging device when the first projection image is captured by the imaging device; and an imaging device when the second projection image is captured by the imaging device. Controlling the second light modulation element so as to reduce the difference between the light receiving intensities of the respective pixels, and changing the position of the second projection image with respect to the first projection image on the projection target surface,
A projection type display system characterized by the above-mentioned.

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