JP5217194B2 - Projector - Google Patents

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JP5217194B2
JP5217194B2 JP2007065368A JP2007065368A JP5217194B2 JP 5217194 B2 JP5217194 B2 JP 5217194B2 JP 2007065368 A JP2007065368 A JP 2007065368A JP 2007065368 A JP2007065368 A JP 2007065368A JP 5217194 B2 JP5217194 B2 JP 5217194B2
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image
projection
video
unit
lens shift
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JP2008225212A (en
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和男 安達
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セイコーエプソン株式会社
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Description

  The present invention relates to a projector, and more particularly to a projector including a plurality of video projection units in one housing.

  As a conventional projector, for example, “the white light source light emitted from the light source lamps 1 and 2 is synthesized by the light source light synthesis prism 25 and is incident on the first fly-eye lens 3. The colors are separated, intensity-modulated by the liquid crystal panels 17, 18 and 19, and projected by the projection lens 21. In the present invention, the white light source light from the light source lamps 1 and 2 is synthesized by the light source light synthesis prism 25. The two light source lights are combined into one image, and the secondary light source image connected to the pupil portion of the projection lens at this time is also a uniform image in the pupil, and is an image for each primary color of R, G, B. Since the image is formed in one place, there is no light quantity distribution unevenness in each color. ”(For example, refer to Patent Document 1).

  Further, for example, “continuous image conversion means 3a to 3c that apply weights to a portion to which a plurality of image signals are connected, and an image that is projected from a direction that is not perpendicular to the screen 4 on the projection surface, Projection conversion means 2a to 2c for converting images to have the same shape and projection means 1a to 1c for projecting and displaying a plurality of images are provided, and the input image is converted by the continuous image conversion means and the projection conversion means. When the image is projected obliquely by the projection means, the projected image is converted so as to be continuous. ”(For example, see Patent Document 2).

JP 2001-166378 A (summary) JP-A-6-178327 (summary)

  Since a conventional projector can project only one projected image, when projecting a plurality of images on the same screen, it is necessary to install a plurality of projectors, and installation work by a user becomes complicated. There was a problem.

  In addition, the conventional projector arranges the projected images from a plurality of projectors on a screen and displays them as one large screen image. However, the images projected from the plurality of projectors form one continuous image. In addition, it is necessary to adjust the projection position for each projector, and there is a problem that the adjustment work of the projection position becomes complicated.

  The present invention has been made to solve such a problem, and an object thereof is to obtain a projector capable of projecting a plurality of images on the same screen without installing a plurality of projectors.

The projector according to the present invention includes a light source, a video signal processing unit that converts an input video signal to generate a video signal for projection video, and the light source based on the video signal generated by the video signal processing unit. An image projection unit having at least a light modulation unit that modulates light from the light and emits image light and a projection optical system that enlarges and projects the image light emitted by the light modulation unit onto a screen. And a lens shift unit that is provided in the projection optical system and moves a projection position of an image to be enlarged and projected on the screen up and down and / or left and right, and a lens shift control signal of the plurality of image projection units. A control unit that outputs to each of the lens shift units; and an imaging unit that captures an image projected on the screen. One video signal is input, and the video divided into arbitrary areas among the video based on the video signal is enlarged and projected onto the screen, and the control unit is configured to capture the screen from the captured video captured by the imaging unit. The four corners of each image projected on the screen are detected, and it is determined whether or not a continuous one image is formed by determining whether or not the corners of adjacent images among the images coincide with each other. When no image is formed, a lens shift control signal for moving the projection position of each image is generated so that each image forms a continuous image, and is output to the lens shift unit, The shift unit moves the projection position of the image up and down and / or left and right based on the lens shift control signal .
In the present invention, since a plurality of video projection units are provided in one housing, for example, even when a plurality of videos are projected on the same screen, it is not necessary to install a plurality of projectors, and a plurality of video projection units can be set by the user. The trouble of installing the projector is eliminated.

In the present invention, since the projection position of the image to be enlarged and projected on the screen can be moved up and down and / or left and right, the projection position of the image projected by each image projection unit can be changed to a desired position by the user's operation. Can be moved to.

In the present invention, since the projection position of the image is moved up and down and / or left and right based on the lens shift control signal, the projection position of the image projected by each image projection unit is controlled by the control unit. Can be moved.

In the present invention, a plurality of video projection units are provided in a single housing, and the same video signal is input to each video projection unit, and images divided into arbitrary areas are divided into images based on the video signals. Since the projection position is moved such that the divided images are enlarged and projected onto the screen and the divided images form a continuous image, it is possible to project one image as a large screen image with high definition. Further, there is no need to install a plurality of projectors and adjust their projection positions, and the trouble of installing a plurality of projectors by the user and the trouble of adjusting the projection positions are eliminated.

In the present invention, the lens shift control signal corresponding to the captured image captured by the imaging unit is generated, and the projection position of the image is moved up and down and / or left and right based on the lens shift control signal. Therefore, it is not necessary to adjust the projection position, and the trouble of adjusting the projection position is eliminated.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a projector according to the first embodiment, and FIG. 2 is a diagram schematically showing a projection state of the projector according to the first embodiment. As shown in FIG. 1, the projector 1 includes a light source 11 and liquid crystal light valves 12R, 12G, and 12B, which are light modulation means for modulating the light from the light source 11 and emitting image light (hereinafter simply referred to as “not distinguished”). A liquid crystal light valve 12), a projection optical system 13 for enlarging and projecting image light emitted by the liquid crystal light valve 12 onto a screen, and a liquid crystal light valve driving unit 14 for driving the liquid crystal light valve 12. Video projection units 2-1 and 2-2 having a video signal processing unit 32 that converts a video signal to generate a video signal for projection video, a frame memory 33, and a lens shift control unit 40 (hereinafter, not distinguished) In this case, the image projection unit 2 is simply provided in one housing. As shown in FIG. 2, in the image projection unit 2, projection lenses (described later) of the projection optical system 13 are arranged side by side on the same side surface of the projector 1. Further, the projector 1 includes a control unit 20, a video input unit 31, an operation signal processing unit 43, a CCD camera 41 that is an imaging unit that captures an image projected on a screen (described later), an operation panel 44, And a storage unit 45. The video signal processing unit 32 includes an OSD (on-screen display) processing unit 321 and a trapezoidal distortion correction unit 322, the control unit 20 includes a calculation unit 21, and the video input unit 31 includes A selector 311 is included. Further, the projection optical system 13 has a lens shift unit 131.

  The projector 1 projects video light input from at least one of the external video signal supply devices PC1 and PC2 by video projection units 2-1 and 2-2 according to the video signals, respectively. The projected image is enlarged and projected onto a projection object (corresponding to a screen in the present invention, hereinafter referred to as a screen SC) such as a screen, a white wall, or a white board.

  The control unit 20 is connected to the video input unit 31, the video signal processing unit 32, the lens shift control unit 40, the operation signal processing unit 43, and the storage unit 45. The control unit 20 is configured by a microprocessor or the like, executes a control program stored in the storage unit 45, etc., controls the operation of the projector 1 in an integrated manner, and receives various types of input from each unit connected to the control unit 20. Data is calculated by the calculation unit 21 and the calculation result is output to each unit. Further, the control unit 20 outputs divided region information (described later) to the video signal processing unit 32 of each video projection unit 2 by the operation described later, and the video signal processing unit 32 divides the projection display into arbitrary regions. A video signal is generated. Furthermore, a lens shift control signal is generated and output to the lens shift control unit 40 of the image projection units 2-1 and 2-2 by the operation described later. The control unit 20 and the calculation unit 21 correspond to the control unit in the present invention.

  The video input unit 31 receives a video signal from at least one of the external video supply devices PC1 and PC2, and converts various signals corresponding to the input video signal, for example, in the case of an analog video signal, to convert it into a digital video signal. Processing is performed and output to the video signal processing units 32 of the video projection units 2-1 and 2-2, respectively.

  Further, the selector 311 of the video input unit 31 switches the input video signal output to the video signal processing unit 32 to one of the video signals of the video supply device PC1 or PC2 in accordance with an instruction from the control unit 20, and performs video projection. The same video signal or different video signals are input to the units 2-1 and 2-2, respectively. The video signals input from the external video supply devices PC1 and PC2 include, for example, RGB signals representing computer video output from a personal computer, and composites representing moving images output from a video recorder or a television receiver. A video signal such as a video signal is supplied.

  The video signal processing unit 32 includes a signal processing circuit such as a microprocessor (for example, a DSP), for example, and performs various processes described later by executing a control program stored in a storage unit incorporated therein. In addition, a frame memory 33 is connected to the video signal processing unit 32, and the video signal from the video input unit 31 is stored in the frame memory 33 for each frame (one video screen) and stored in the frame memory 33. It has a function to read the video (hereinafter also referred to as frame video). Various signal processing such as resolution conversion processing for adjusting the resolution of the video signal to the resolution of the liquid crystal light valve 12 is performed.

  The OSD processing unit 321 of the video signal processing unit 32 is an OSD image of a menu video when performing characters and symbols representing various states of the projector 1, image quality adjustment, various setting operations, and the like in accordance with control commands from the control unit 20. A process of combining the signal with the frame video signal is performed. Specifically, the control unit 20 reads, for example, menu video data from the storage unit 45 and supplies it to the video signal processing unit 32. The video signal processing unit 32 generates an OSD video signal from the menu video data, and this OSD The video signal is combined with the frame video signal. When the OSD process is not performed, the frame video signal is output as it is. When the menu image is displayed by the OSD process, the user sets or adjusts the function of each unit of the projector according to the menu image.

  The trapezoidal distortion correction unit 322 of the video signal processing unit 32 suppresses the trapezoidal distortion that occurs when the projection light emitted from the projector 1 is projected (tilted) with respect to the projection surface of the screen SC. For this purpose, the input video signal is corrected, and the corrected video signal is output to the liquid crystal light valve driving unit 14. When no trapezoidal distortion occurs, the video signal output from the video signal processing unit 32 is supplied to the liquid crystal light valve driving unit 14 as it is without performing the above correction, and the liquid crystal light valve driving unit 14 The liquid crystal light valve 12 is driven in accordance with the input video signal.

  A plurality of pixels (not shown) are formed in a matrix in the liquid crystal light valves 12R, 12G, and 12B, and the transmittance of each pixel is adjusted by the liquid crystal light valve driving unit 14, so that the light source 11 Modulates the emitted light. The image light emitted from the liquid crystal light valve 12 is enlarged and projected on the screen SC by the projection optical system 13. As described above, the liquid crystal light valve 12 is composed of the three liquid crystal light valves 12R, 12G, and 12B, and modulates each color light of R (red), G (green), and B (blue). The light emitted from the light source 11 is separated into each color light by a color light separation optical system (not shown) and then modulated by the corresponding liquid crystal light valves 12R, 12G, and 12B, and is combined with a synthesis optical system (not shown, for example, a cross dichroic prism). ) And then enlarged and projected by the projection optical system 13. The projection optical system 13 includes a focus mechanism that can change the focus of the projection light, a zoom mechanism that can change the magnification of the projection light, and the like (all of which are not shown). Further, the projection optical system 13 includes a lens shift unit 131 that moves the position of a projection lens (not shown).

  The lens shift unit 131 is provided with a motor for moving the position of the projection lens in the vertical and horizontal directions (hereinafter referred to as lens shift), and the lens shift control unit 40 outputs from the control unit 20 by an operation described later. In accordance with the lens shift control signal, a drive signal for driving the motor of the lens shift unit 131 is generated, and the motor of the lens shift unit 131 is driven to move the projection lens in the vertical and horizontal directions by a predetermined movement amount. Thus, the vertical and horizontal positions of the projected image projected on the screen SC are adjusted. This lens shift is, for example, to move the projected image by up and down 3 screens and left and right 2 screens. The lens shift control unit 40 and the lens shift unit 131 correspond to the lens shift unit in the present invention. In this embodiment, the case where the position of the projection lens is moved using a motor will be described. However, the present invention is not limited to this, and the lens shift unit is a mechanism for manually moving the projection lens up and down and left and right. The projection position may be moved by a user's manual operation.

  The CCD camera 41 is provided on the same side as the projection lens and captures an image projected on the screen SC. The control unit 20 outputs a lens shift control signal from the video imaged by the CCD camera 41 to the lens shift control unit 40 by an operation described later. Note that the imaging means of the present invention is not limited to a CCD camera, and for example, a CMOS sensor, an RGB sensor, or the like may be used.

  The operation panel 44 has various switches such as a power key, a keystone correction key, a lens shift operation key input switching key, a duplicate projection mode selection key, and a division projection mode selection key, and provides an operation signal corresponding to a key operation by the user. Output to the operation signal processing unit 43. The remote controller (hereinafter simply referred to as “remote controller”) RC has operation keys corresponding to various keys of the operation panel 44 and outputs an operation signal corresponding to the key operation by the user to the operation signal processing unit 43. . The operation signal processing unit 43 receives an operation signal input from the operation panel 44 or the remote controller RC and outputs it to the control unit 20.

  The storage unit 45 stores a control program executed by the control unit 20 and OSD video data for generating an OSD video, and stores various setting values of the projector 1. Further, information on the lens shift amount at the time of overlapping projection and information on the lens shift amount at the time of divided projection, which will be described later, are stored in advance.

  With this configuration, the operation in the first embodiment in which the image projection unit 2 projects independent images will be described below with reference to FIGS.

FIG. 3 is a diagram illustrating a projection position of an image projected on the screen according to the first embodiment. 3A shows a case where the projected images are arranged on the left and right, FIG. 3B shows a case where the projected images are arranged vertically, and FIG. 3C shows a case where the projected images are arranged at arbitrary positions. is there.
The video input unit 31 receives an input video signal (hereinafter referred to as “input 1”) from the external video supply device PC1 and an input video signal (hereinafter referred to as “input 2”) from the video supply device PC2. The

  When the input switch key of the operation panel 44 is operated by the user, the operation signal processing unit 43 inputs an operation signal corresponding to the key input to the control unit 20. The control unit 20 outputs a switching instruction to the selector 311 in response to the input switching operation signal. This input switching operation can be performed, for example, by selecting either input 1 or input 2 for each video projection unit 2 using an input switching key provided for each video projection unit 2. Alternatively, the menu image can be displayed by OSD image, and the menu item can be selected to select either input 1 or input 2 for each image projection unit 2. Here, the user has performed a switching operation to output the input 1 to the video signal processing unit 32 of the video projection unit 2-1 and output the input 2 to the video signal processing unit 32 of the video projection unit 2-2. The following operation will be described as an example.

  The selector 311 switches the input video signal output to the video signal processing unit 32 of the video projection unit 2-1 to the input 1 in response to a switching instruction from the control unit 20, and then switches to the video signal processing unit 32 of the video projection unit 2-2. The input video signal to be output is switched to input 2. The video signal processing unit 32 to which the video signal is input generates a frame video from the input video signal, performs synthesis with the OSD video signal and trapezoidal distortion correction according to an instruction from the control unit 20 as necessary. The frame video signal is supplied to the liquid crystal light valve driving unit 14. The liquid crystal light valve drive unit 14 drives the liquid crystal light valve 12 in accordance with the input video signal. The liquid crystal light valve 12 modulates the light of the light source 11 and emits image light by adjusting the transmittance of each pixel by the liquid crystal light valve driving unit 14. This image light is enlarged and projected onto the screen SC via the projection optical system 13, and as shown in FIG. 2, the image projection unit 2-1 generates a projection image G1 based on the input 1 by the image projection unit 2-2. The projected video G2 based on the input 2 is projected on the screen SC.

  Next, the user performs a lens shift operation as necessary to adjust the projection position of the projection images G1 and G2. When the lens shift operation key of the operation panel 44 is operated by the user, the operation signal processing unit 43 inputs an operation signal corresponding to the key input to the control unit 20. The control unit 20 outputs a lens shift control signal to the lens shift control unit 40 of each image projection unit 2 in accordance with the operation signal of the lens shift operation key. This lens shift operation can be performed, for example, by selecting a lens shift direction using a lens shift operation key provided for each video projection unit 2. It is also possible to display the menu image using the OSD image and select the menu item to select the lens shift direction.

  The lens shift control unit 40 of each image projection unit 2 generates a drive signal for driving the motor of the lens shift unit 131 in accordance with the lens shift control signal input from the control unit 20, and the motor of the lens shift unit 131 is operated. By driving, the projection lens is moved in the vertical and horizontal directions by a predetermined movement amount.

  By such an operation, as shown in FIGS. 3A to 3C, the projected images G1 and G2 moved to arbitrary projection positions in the vertical and horizontal directions by the user's operation are projected on the screen SC.

  As described above, in the first embodiment, a plurality of video projection units are provided in a single housing, and different video signals are input to the video projection unit 2 to project independent videos. A plurality of videos can be projected on the same screen SC using one projector, and the trouble of installing a plurality of projectors by the user is eliminated.

  Further, since the lens shift unit 131 is provided in the projection optical system 13 of each image projection unit 2, the projection position of the image projected by each image projection unit 2 is moved to a desired position by a user operation. Can do.

  In the above description, a switching operation has been performed in which the input 1 is output to the video signal processing unit 32 of the video projection unit 2-1, and the input 2 is output to the video signal processing unit 32 of the video projection unit 2-2. However, the present invention is not limited to this, and each video projection unit 2 may project an image based on the same video signal at an arbitrary projection position.

  In the above description, the case where there are two image projection units 2 has been described. However, the present invention is not limited to this, and two or more image projection units 2 may be provided in one housing.

Embodiment 2. FIG.
In the second embodiment, each of the video projection units 2 projects the same video onto the screen SC, and the projected video is projected onto the same position on the screen SC. Each configuration of the projector 1 is the same as that of the first embodiment.

  FIG. 4 is a flowchart showing the operation of overlapping projection according to the second embodiment, and FIG. 5 is a diagram showing the projection position of the image projected on the screen according to the second embodiment. Hereinafter, the overlapping projection operation in the second embodiment will be described with reference to FIGS.

  Input 1 and input 2 are input to the video input unit 31 as in the first embodiment. In the second embodiment, either one of the inputs to the video input unit 31 may be used.

  When the duplicate projection mode selection key is operated by the operation of the operation panel 44 by the user, the operation signal processing unit 43 inputs an operation signal corresponding to the key input to the control unit 20. The control unit 20 starts the operation of the overlapping projection mode by this input. When the user operates the operation panel 44 to select an input video signal for overlapping projection, the operation signal processing unit 43 inputs an operation signal corresponding to the key input to the control unit 20 (S201). The control unit 20 outputs a switching instruction to the selector 311 so as to output the selected input video signal to be overlap-projected to the video signal processing unit 32 of each video projection unit 2 (S202). Here, the following operation will be described on the assumption that the user has performed a selection operation as a video signal on which input 1 is projected in duplicate.

  Next, the selector 311 switches the input video signal to input 1 according to the switching instruction from the control unit 20 and outputs the input video signal to the video signal processing units 32 of the video projection units 2-1 and 2-2. The video signal processing unit 32 to which the video signal is input enlarges and projects the video based on the input video signal on the screen SC by the same operation as in the first embodiment described above (S203).

  Next, the control unit 20 reads out information on the lens shift amount at the time of overlapping projection stored in the storage unit 45 in advance, and sends a lens shift control signal corresponding to this information to the lens shift control of each video projection unit 2. Output to the unit 40. Here, the lens shift amount at the time of overlapping projection stored in advance is a lens shift amount such that the projected images by the image projection units 2-1 and 2-2 are at the same position on the screen SC. Stored for each projection unit 2.

  The lens shift control unit 40 of each image projection unit 2 generates a drive signal for driving the motor of the lens shift unit 131 in accordance with the lens shift control signal input from the control unit 20, and the motor of the lens shift unit 131 is operated. By driving, the projection lens is moved in the vertical and horizontal directions by a predetermined movement amount (S204).

  By such an operation, as shown in FIG. 5, the image projection units 2-1 and 2-2 project the projection images G1 and G2 by the same image signal onto the screen SC, respectively, and the projection images G1 and G2 are displayed on the screen. Overlapping projection is performed at the same position on the SC.

  As described above, in the second embodiment, a plurality of video projection units are provided in one casing, and each video projection unit 2 projects the same video onto the screen SC, and the projected video is located at the same position on the screen SC. By overlapping and projecting, the same image can be projected on the same screen SC using one projector without installing a plurality of projectors, and the projected image can be made a high-intensity image.

  In addition, since information on the lens shift amount at the time of overlapping projection is stored in advance and the projection position is adjusted by a lens shift control signal based on this information, the trouble of adjusting the projection position by the user is eliminated.

Embodiment 3 FIG.
In the third embodiment, the same video signal is input to each video projection unit 2, and among the video based on this video signal, the video divided into arbitrary areas is enlarged and projected onto the screen SC, and divided. The projection position is moved so that each image forms a continuous image. Each configuration of the projector 1 is the same as that of the first embodiment.

  FIG. 6 is a flowchart showing an operation of split projection according to the third embodiment, and FIG. 7 is a diagram showing a projection position of an image projected on the screen according to the third embodiment. Hereinafter, the division projection operation according to the third embodiment will be described with reference to FIGS. In the present embodiment, a case where an image is divided in the width direction will be described. However, the present invention is not limited to this, and the image may be divided in the vertical direction.

  Input 1 and input 2 are input to the video input unit 31 as in the first embodiment. In the third embodiment, either one of the inputs to the video input unit 31 may be used.

  When the divided projection mode selection key is operated by the operation of the operation panel 44 by the user, the operation signal processing unit 43 inputs an operation signal corresponding to the key input to the control unit 20. The control unit 20 starts the operation of the divided projection mode by this input. When the user operates the operation panel 44 to select an input video signal to be divided and projected, the operation signal processing unit 43 inputs an operation signal corresponding to the key input to the control unit 20 (S301). The control unit 20 outputs a switching instruction to the selector 311 so that the selected input video signal to be divided and projected is output to the video signal processing unit 32 of each video projection unit 2. Here, the following operation will be described on the assumption that the user has made a selection operation as a video signal for split projection of input 1.

  The selector 311 switches the input video signal to input 1 in response to a switching instruction from the control unit 20 and outputs the input video signal to the video signal processing units 32 of the video projection units 2-1 and 2-2, respectively (S302).

  The control unit 20 outputs the divided area information to the video signal processing unit 32 of each video projection unit 2 (S303). Here, the divided area information is divided and projected from among the images projected by each image projection unit 2 according to the number of image projection units 2 and the arrangement position of the projection optical system 13 of the image projection unit 2. This defines the area of the video to be played. For example, in the present embodiment, as shown in FIG. 2, the projection optical system 13 of the video projection unit 2-1 is arranged on the left side with respect to the screen SC, and the number of video projection units 2 is “2”. Therefore, the divided area information to the video signal processing unit 32 of the video projection unit 2-1 is a video that divides the video based on the input video signal into two in the width direction (left and right) and projects the video on the left side thereof. It is information determined as. Similarly, the divided area information for the video signal processing unit 32 of the video projection unit 2-2 is information that is divided into two in the width direction and is determined as a video to be projected on the right side. For example, when the video is divided in the vertical direction, the divided area information is divided into two in the vertical direction, and the upper and lower videos. For example, when there are three image projection units 2, the image is divided into three in the width direction, and the divided region information is the left, center, and right images.

  The video signal processing unit 32 to which the divided area information is input generates a frame image of the video in the area specified by the divided area information from the video based on the input video signal, and if necessary, the control unit 20. The frame video signal is supplied to the liquid crystal light valve driving unit 14 after being synthesized with the OSD video signal and trapezoidal distortion correction. The liquid crystal light valve drive unit 14 drives the liquid crystal light valve 12 in accordance with the input video signal. The liquid crystal light valve 12 modulates the light of the light source 11 and emits image light by adjusting the transmittance of each pixel by the liquid crystal light valve driving unit 14. This image light is enlarged and projected onto the screen SC via the projection optical system 13, and as shown in FIG. 7A, the image projection unit 2-1 splits the image based on the input 1 into two in the width direction. The right projected image G2 obtained by dividing the image based on the input 1 into two in the width direction is projected on the screen SC by the image projection unit 2-2 (S304).

  Next, the control unit 20 reads information on the lens shift amount at the time of divided projection, which is stored in the storage unit 45 in advance, and sends a lens shift control signal corresponding to this information to the lens shift control of each video projection unit 2. Output to the unit 40. Here, the lens shift amount at the time of divided projection stored in advance is the lens shift amount by which the projection position of each image is moved so that each divided image forms a continuous image. Stored for each projection unit 2.

  The lens shift control unit 40 of each image projection unit 2 generates a drive signal for driving the motor of the lens shift unit 131 in accordance with the lens shift control signal input from the control unit 20, and the motor of the lens shift unit 131 is operated. By driving, the projection lens is moved in the left-right direction by a predetermined movement amount (S305).

  By such an operation, as shown in FIG. 7B, the image projection units 2-1 and 2-2 screen the projection images G1 and G2 divided into two in the width direction among the images based on the same image signal. Projected onto the SC, the projected images G1 and G2 are formed as one continuous image on the screen SC.

  As described above, in the third embodiment, the same video signal is input to each video projection unit 2, and among the videos based on this video signal, the video divided into arbitrary areas is enlarged and projected onto the screen SC. Then, by moving the projection position so that the divided images form one continuous image, it is possible to project one image as a large screen image with high definition.

  In addition, a plurality of video projection units are provided in one housing, and the projection position of the video projected by the video projection unit 2 is adjusted based on information on lens shift amounts stored in advance. There is no need to install and adjust the projection position, and the trouble of installing a plurality of projectors by the user and the trouble of adjusting the projection position are eliminated.

Embodiment 4 FIG.
In the third embodiment, information on the lens shift amount stored in advance is read, and the lens shift is performed by the lens shift control signal corresponding to this information. In the fourth embodiment, the image is captured by the CCD camera 41. The lens shift is performed by a lens shift control signal corresponding to the captured image, and the projection position is adjusted so that the projected images of the image projection units 2-1 and 2-2 form one continuous image. Each configuration of the projector 1 is the same as that of the first embodiment.

  FIG. 8 is a flowchart showing the projection position adjustment operation according to the fourth embodiment, and FIG. 9 is a diagram showing the projection position of the image projected on the screen according to the fourth embodiment. Hereinafter, the operation of adjusting the projection position in the second embodiment will be described with reference to FIGS.

  When the position adjustment mode selection key is operated by the operation of the operation panel 44 by the user, the operation signal processing unit 43 inputs an operation signal corresponding to the key input to the control unit 20. The control unit 20 starts the operation of the position adjustment mode by this input. The control unit 20 instructs the video signal processing unit 32 of each video projection unit 2 to generate a predetermined test pattern video, and each video signal processing unit 32 generates a test pattern video and outputs the video signal to the liquid crystal light. An image based on the input video signal of the test pattern is enlarged and projected on the screen SC by supplying the same to the valve 12 and the same operation as in the first embodiment (S401). Here, the test pattern image can be projected, for example, by storing the information of the image signal in advance in the storage unit 45 and supplying the information to the image signal processing unit 32 by the control unit 20, or the OSD processing unit 321. Thus, the video can be projected as an OSD video.

  Next, the CCD camera 41 images the test pattern image projected on the screen SC and outputs the image information to the control unit 20 (S402). Here, the imaging information is, for example, information obtained by digitizing the luminance value for each pixel of the CCD camera 41. The control unit 20 detects a projected image from the image information captured by the CCD camera 41, and determines whether the projected image is continuous (S403, S404). As shown in FIG. 9, for example, the four corners S1 to S8 of the video are detected from the luminance information of each test pattern video, and the adjacent video corners of the projected video are determined. Can be determined by whether or not. That is, in FIGS. 9A and 9B, it can be determined that the corners S2-S5 and the corners S4-S7 do not match and the images are separated or overlapped. Further, for example, it may be determined whether or not the projected images are continuous based on the continuity of the pattern of each projected image, or other methods may be used.

  If the control unit 20 determines in step S404 that the projected images are continuous, the control unit 20 ends the position adjustment operation. On the other hand, if it is determined that the projected images are not continuous, a lens shift control signal having a predetermined lens shift amount corresponding to the position of each test pattern image is generated and sent to the lens shift control unit 40 of each image projection unit 2. Each is output and the projection lens is moved in the vertical and horizontal directions by a predetermined movement amount (S405). That is, as shown in FIG. 9A, when each test pattern image is separated, a lens shift control signal is generated so as to shift each projection image to the inside of the screen SC. ), When each test pattern image overlaps, a lens shift control signal is generated that shifts each projection image to the outside of the screen SC.

  Next, the control unit 20 detects the projected image again from the image information captured by the CCD camera 41, determines whether or not the projected image is continuous (S406, S407), and the projected image continues. The above steps S405 to S407 are repeated until it is determined that it is being performed. Note that whether or not the projected images are continuous in step S407 is determined by detecting the corners of the adjacent images of the above-described projected images, and when the interval between the corners is minimized, the projected images are continuously displayed. You may judge that

  By such an operation, as shown in FIG. 9C, the projection position can be adjusted so that the projected images of the image projection units 2-1 and 2-2 form one continuous image.

  As described above, in the fourth embodiment, a plurality of video projection units are provided in one casing, and the projection position of the video projected by this video projection unit 2 is taken as the captured video of the CCD camera 41 that is the imaging means. Since the adjustment is performed by the corresponding lens shift control signal, the trouble of installing a plurality of projectors by the user and the trouble of adjusting the projection position are eliminated.

In the above description, the case where one image continuous in the left-right direction is formed in FIG. 9 is shown, but the present invention is not limited to this, and the projection position is set so as to form one image continuous in the vertical direction. You may adjust it.

  In the above description, the projection position is adjusted so that the projection images of the image projection units 2-1 and 2-2 form a continuous image. However, the present invention is not limited to this, and the projection position can be moved to an arbitrary projection position. You may make it let it. For example, as in the second embodiment, each projection image may be projected in duplicate, or may be projected at a predetermined interval.

Embodiment 5 FIG.
Information on the lamp current of the light source 11 is input to the control unit 20 in the present embodiment from a light source lighting device (not shown). Each configuration of the projector 1 is the same as that of the first embodiment.

  In the fifth embodiment, the control unit 20 causes an image to be projected onto the screen SC by any one of the image projection units 2-1 and 2-2. The control unit 20 determines that the light source 11 is out of lamp based on a change in the lamp current of the image projection unit 2 that is projecting an image. When the lamp is out, the other image projection unit 2 displays the image on the screen SC. To project.

  As described above, in the third embodiment, the lamp current of the light source 11 is determined to be out of lamp, and the image projection unit 2 projects an image on the screen SC, thereby causing a light source failure. However, it is possible to continuously project an image.

  In the first to fifth embodiments, the light emitted from the light source 11 is modulated by using the liquid crystal light valve 12, but the present invention is not limited to this, and other spatial light modulators may be used. For example, a DMD (Digital Micromirror Device) that projects an image by controlling the tilt of a mirror with a small area spread on a semiconductor substrate based on the image data may be used. DMD is a trademark of Texas Instruments Incorporated.

1 is a block diagram illustrating a configuration of a projector according to a first embodiment. FIG. 3 schematically shows a projection state of the projector according to the first embodiment. 6 is a diagram illustrating a projection position of an image projected on a screen according to Embodiment 1. FIG. 10 is a flowchart illustrating an operation of overlapping projection according to the second embodiment. 6 is a diagram illustrating a projection position of an image projected on a screen according to Embodiment 2. FIG. 14 is a flowchart illustrating an operation of divided projection according to the third embodiment. 10 is a diagram illustrating a projection position of an image projected on a screen according to Embodiment 3. FIG. 10 is a flowchart showing a projection position adjustment operation according to the fourth embodiment. FIG. 10 is a diagram illustrating a projection position of an image projected on a screen according to a fourth embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Projector, 2 Image | video projection unit, 11 Light source, 12R Liquid crystal light valve, 12G Liquid crystal light valve, 12B Liquid crystal light valve, 13 Projection optical system, 14 Liquid crystal light valve drive part, 20 Control part, 21 Computation part, 31 Video input part 32 video signal processing unit, 33 frame memory, 40 lens shift control unit, 41 CCD camera, 43 operation signal processing unit, 44 operation panel, 45 storage unit, 131 lens shift unit, 311 selector, 321 OSD processing unit, 322 trapezoid Distortion correction unit, PC1 video supply device, PC2 video supply device, RC remote controller, SC screen.

Claims (1)

  1. A light source, a video signal processing unit that converts an input video signal to generate a video signal for projection video, and modulates light from the light source based on the video signal generated by the video signal processing unit. A plurality of image projection units each including at least a light modulation unit that emits image light and a projection optical system that enlarges and projects the image light emitted by the light modulation unit on a screen ,
    A lens shift unit that is provided in the projection optical system and moves a projection position of an image to be enlarged and projected on the screen up and down and / or left and right;
    A control unit that outputs a lens shift control signal to each of the lens shift units of the plurality of video projection units;
    Imaging means for imaging the image projected on the screen,
    The plurality of image projection units are:
    Each of the same video signals is input, and among the videos based on the video signals, videos divided into arbitrary areas are respectively projected and enlarged on the screen,
    The controller is
    Four corners of each of the images projected on the screen are detected from the captured images picked up by the imaging means, and a continuous one image is formed depending on whether or not the corners of adjacent images among the images match. If a continuous image is not formed, a lens shift control signal is generated to move the projection position of each image so that each image forms a continuous image. , Output to the lens shift unit,
    The lens shift unit is
    A projector, wherein the projection position of the image is moved up and down and / or left and right based on the lens shift control signal .
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JP2010243545A (en) * 2009-04-01 2010-10-28 Seiko Epson Corp Light modulation element positioning method for projector and projector
JP5682274B2 (en) * 2010-12-10 2015-03-11 セイコーエプソン株式会社 Projector and control method
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