JP2006017863A - Video display system, screen unit and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To always provide a bright video, regardless of the position of an observer. <P>SOLUTION: The video display system has the projector 1 projecting image light, a screen body 10 to which the video is projected by the projector 1, a human sensor 17 arranged on the screen body 10, and a movable mask 18 arranged in front of the human sensor 17. The position of the observer X is prescribed, based on the displacing amount of the movable mask 18 when the observer X is detected by the human sensor 17, and the screen body 10 is turned centering rotary shafts 15a and 15b according to the prescribed position of the observer X, thereby optimizing a screen angle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a video display system using a projector.

A general video display system using a projector is composed of a projector and a screen on which an image is projected by the projector. The image light emitted from the projector is imaged on the front surface of the screen to display the image. ing. Therefore, if a person or an object exists in the space between the projector and the screen, a shadow is formed on the front surface of the screen. Therefore, it is desirable to bring the projector as close to the screen as possible. However, when the projector is brought closer to the screen, the projection angle of image light (sometimes referred to as “launch angle” or “tilt angle”) becomes steep, and the trapezoidal distortion of the image becomes remarkable. In particular, the larger the size of the displayed image, the larger the difference between the optical path length from the projector to the lower part of the image and the optical path length to the upper part of the image, and the trapezoidal distortion becomes more remarkable. In order to solve such a problem, various projectors having a trapezoidal distortion correction function have been developed. For example, Patent Document 1 discloses a technique for correcting trapezoidal distortion by providing two reflecting mirrors in front of a projection lens of a projector and changing the arrangement angle of each reflecting mirror and the distance between the mirrors. . In Patent Document 2, a distortion image obtained by distorting an image displayed on a screen into a substantially trapezoid is formed in advance, and the distortion image and an image formed based on input image data are synthesized. A technique for eliminating trapezoidal distortion on the screen by projecting the image on the screen is disclosed.
JP-A-9-5887 JP 2001-230991 A

  The trapezoidal distortion correction function in a projector is progressing day by day. However, new problems arise as the trapezoidal distortion correction function advances and a large-size image can be displayed at a short projection distance. That is, as the projection distance of the image light becomes shorter, the projection angle of the image light becomes steeper, and the incident angle of the image light to the screen (the angle formed by the optical axis of the image light and the screen surface) becomes acute. As a result, the emission angle (reflection angle) of the image light incident on the screen naturally becomes an acute angle, and the image light escapes in the overhead direction of the observer who is in front of the screen. As a result, the brightness of the image in the appearance of the observer is lowered.

  The present invention has been made in view of the above problems, and an object thereof is to realize a video display system capable of providing a bright video without distortion at a short projection distance.

  An image display system of the present invention includes a projector that projects image light, a screen on which an image is projected by the projector, an observer detection unit that detects the position of an observer who observes the image projected on the screen, and an observer Screen rotating means for rotating the screen according to the position of the observer detected by the detecting means. Therefore, the screen angle can be changed according to the position of the observer, and adjustment can be made so that the image light is always reflected toward the observer. When there are a plurality of observers, a plurality of observer positions may be detected. In this case, the center of gravity of the plurality of detection points is obtained by a predetermined calculation, and the rotation amount of the screen is determined using this as the position of the observer.

  In the video display system of the present invention, storage means for storing data in which the position of the observer detected by the observer detection means and the amount of rotation of the screen are stored is provided, and the image display system corresponds to the detected position of the observer. Data to be extracted can be extracted from the storage means, and the screen can be rotated by the amount of rotation indicated in the extracted data. Further, in addition to the storage means, a rotation amount detection means for detecting the current rotation amount of the screen is provided, the rotation amount indicated in the data extracted from the storage means, and the current screen detected by the rotation amount detection means. It is also possible to rotate the screen by the difference from the amount of rotation.

  Further, by providing a rotatable reflecting mirror that reflects the image light toward the screen and reflecting mirror rotating means for rotating the reflecting mirror, the image light can be set according to the position of the observer and the angle of the screen. It is also possible to change the projection angle. Alternatively, by providing a rotatable support base on which the projector is placed and a support base rotating means for rotating the support base and tilting the projector, an image is displayed according to the position of the observer and the angle of the screen. The light projection angle can also be changed.

  Since the angle of the screen can be changed according to the position of the observer, a bright image can always be provided regardless of the position of the observer.

(Embodiment 1)
Hereinafter, an example of an embodiment of a video display system of the present invention will be described. As shown in FIG. 1, the video display system of this example includes a projector 1 and a screen unit 2.

  Since the projector 1 has the same configuration as the existing projector, a detailed description is omitted, but a light source and a light valve that modulates light emitted from the light source according to input image data to form image light And at least a projection optical system that projects the image light formed by the light valve toward the screen. In addition, as a light valve, although a liquid crystal light panel and DMD (trademark) are common, it is not limited to those existing light valves. In short, the light valve may have any configuration as long as it is a light valve capable of spatially modulating incident light according to image data to form image light.

A screen unit 2 shown in FIG. 1 includes a screen body 10 and a screen rotation mechanism 30 that rotates the screen body 10 to change an inclination angle (hereinafter also referred to as “screen angle θ ₁ ”) (FIG. 4). And have.

As shown in FIG. 1, the screen body 10 has a sheet material 14 stretched inside a frame 13 formed in a rectangular shape by a pair of vertical members 11a and 11b and a pair of horizontal members 12a and 12b. It is configured to be hung from a ceiling (not shown). Specifically, the rotary shafts 15a and 15b are respectively provided so as to protrude from the upper side surfaces of the both side members 11a and 11b. The rotary shaft 15a is inserted into the box 16 through the side surface of the box 16. The other rotary shaft 15b is rotatably supported by a bearing provided on a bracket (not shown). Therefore, as shown in FIG. 2, by fixing the box 16 and a bracket (not shown) to the ceiling surface 19, the screen body 10 can be rotated to the front side and the back side about the rotation shafts 15a and 15b. The screen angle θ ₁ can be changed by hanging from the ceiling and rotating in the same direction. However, the position of the rotary shaft 15a and 15b is not limited to the position shown, the screen body 10 may be provided on the rotatable position as screen angle theta ₁ is changed.

  Referring to FIG. 1 again, a human sensor 17 for detecting an observer X in front of the screen main body 10 is provided in the longitudinal center of the cross member 12a. The human sensor 17 is an infrared sensor that detects an infrared ray emitted from the human body and detects a person. The human sensor 17 is provided with a small-diameter transmission hole 18a (FIG. 3) in front of the human sensor 17. The mask 18 is provided so as to reciprocate up and down at a constant speed. Therefore, the infrared ray emitted from the observer X is detected by the human sensor 17 only at the moment when the transmission hole 18 a of the movable mask 18 crosses the straight line connecting the observer X and the human sensor 17. That is, as shown in FIG. 3, the position of the movable mask 18 when the observer X is detected by the human sensor 17 differs depending on whether the observer X is at the point A or the point B. Is detected, the position of the observer X can be specified by how much the movable mask 18 is displaced from the reference position.

  As shown in FIG. 4, the screen rotation mechanism 30 includes a step motor 31, a motor drive unit 32 that outputs a drive signal (drive pulse) to the step motor 31, and the rotation of the rotary shaft 15 a with respect to the motor drive unit 32. A control unit 33 that outputs a control signal for instructing the amount of movement, a rotation amount detection unit 34 that detects the amount of rotation of the rotating shaft 15a (= the amount of rotation of the screen body 10), and the control unit 33 determines the amount of rotation of the rotating shaft 15a. The memory 35 stores data necessary for designation, and a gear (not shown) that transmits the rotational driving force of the step motor 31 to the rotary shaft 15a.

The control unit 33 monitors the displacement amount of the movable mask 18 shown in FIG. 1 with respect to the reference position. When the detection signal output from the human sensor 17 is input, the displacement amount of the movable mask 18 at the time of signal input. The position of the observer X is specified based on the above. The memory 35 stores in advance data that associates two or more different positions of the observer X with the rotation amount (rotation angle) of the rotation shaft 15a for realizing a suitable screen angle θ ₁ with respect to each position. It is remembered. Here, the amount of rotation of the rotary shaft 15a corresponds to the screen angle theta ₁ is apparent from the foregoing description, a preferred screen angle theta _1, is projected from the projector 1 shown in FIG. 1, the screen body 10 It is clear from the object of the present invention that it means the angle at which the image light incident on the front surface of the lens is reflected mainly toward the viewer X.

The screen rotation mechanism 30 having the above configuration realizes a suitable screen angle θ ₁ as follows. First, the detection signal output from the human sensor 17 that has detected the observer X is input to the control unit 33. The control unit 33 to which the detection signal is input specifies the current position of the observer X based on the displacement amount of the movable mask 18 when the detection signal is input, and corresponds to the specified current position of the observer X. Data indicating the amount of rotation of the rotating shaft 15a is extracted from the memory 35. Further, the control unit 33 detects the current rotation amount of the rotary shaft 15 a based on the detection result of the rotation amount detection unit 34, and the rotation amount and the current rotation amount indicated in the data extracted from the memory 35. Find the difference between The rotation amount detection unit 34 detects the rotation amount (rotation angle) of the rotation shaft 15a by an encoder attached to the rotation shaft 15a, and automatically outputs it to the control unit 33, or obtains a request from the control unit 33. Output in response. Next, the control unit 33 outputs a control signal indicating a rotation amount corresponding to the obtained difference to the motor driving unit 32. The motor drive unit 32 to which the control signal is input drives the step motor 31 so that the rotation shaft 15a is rotated by the rotation amount indicated by the input control signal.

As described above, the rotation shaft 15a is rotated by a necessary amount, a suitable screen angle θ ₁ is realized, and a bright image is provided to the observer X. Thus, in the video display system of this example, the screen angle θ ₁ is determined based on the position of the observer X, and the screen rotation mechanism 30 realizes the screen angle θ ₁ . Furthermore, the screen rotation mechanism 30 always maintains a suitable screen angle θ ₁ by repeating the above-described operation as necessary or at regular time intervals.

In this example, the current rotation amount of the rotation shaft 15a is acquired before rotating the rotation shaft 15a, and the rotation shaft 15a is moved by the difference between the acquired current rotation amount and the rotation amount indicated in the data. The configuration for optimizing the screen angle θ ₁ by rotating it has been described. However, the configuration for optimizing the screen angle θ ₁ is not limited to the above. For example, the rotation shaft 15a is rotated while detecting the rotation amount by the rotation amount detector 34, and the rotation of the rotation shaft 15a is stopped when the rotation amount shown in the data extracted from the memory 35 is reached. A configuration can also be adopted. It is also possible to adopt a configuration in which the rotary shaft 15a is returned to the reference position once before the rotary shaft 15a is rotated and then is rotated by a necessary amount. In the latter case, the latest rotation direction and rotation amount of the rotation shaft 15a are stored in the memory 35, and stored in the direction opposite to the rotation direction stored in the memory 35 prior to the next rotation of the rotation shaft 15a. The rotation shaft 15a can be returned to the reference position by rotating the rotation shaft 15a by the rotation amount. In this way, the screen angle θ ₁ can be optimized without providing the rotation amount detector 34 shown in FIG. Of course, the rotation amount detector 34 may detect that the rotating shaft 15a has been returned to the reference position, or may be detected by other means (for example, a limit switch that is pressed when the rotating shaft 15a returns to the reference position). May be. The amount of rotation of the rotating shaft 15a can also be detected by counting the number of drive pulses input to the step motor 31 (output from the motor drive unit 32).

(Embodiment 2)
Hereinafter, another example of the embodiment of the video display system of the present invention will be described. Similar to the video display system of the first embodiment, the video display system of this example is configured by a screen unit and a projector. Further, the screen unit has the same configuration as that described in the first embodiment except that the control unit 33 shown in FIG. 4 can output all or part of the data extracted from the memory 35 shown in FIG. 4 to the projector. It has a configuration. Therefore, description of the screen unit is omitted by using the same names and symbols as those in the first embodiment.

  The projector constituting the video display system of this example has the configuration shown in FIG. That is, a housing 40, a light source 41 provided inside the housing 40, and a reflective light valve that spatially modulates light emitted from the light source 41 based on image data to form image light. 42 and a reflection enlarging projection optical system that enlarges the cross section of the light beam while turning back the optical path of the image light formed by the light valve 42. Furthermore, the reflection expansion projection optical system is configured by first to third reflection mirrors 43, 44, and 45, and the first reflection mirror 43 secondly reflects the image light formed by the light valve 42. Reflected toward the mirror 44, the second reflecting mirror 44 reflects the incident image light toward the third reflecting mirror 45, and the third reflecting mirror 45 reflects the incident image light on a screen (not shown). Reflect toward (project).

Here, the third reflecting mirror 45 can be rotated in the direction of the arrow in the figure, and is rotated by the mirror rotating mechanism 50 shown in FIG. 6 to thereby form an inclination angle (hereinafter referred to as “mirror angle θ ₂ ”). May change). The mirror rotation mechanism 50 includes a data reception unit 51 that receives data indicating the rotation amount of the rotation shaft 15a (= the rotation amount of the screen body 10) output from the control unit 33 of the screen rotation mechanism 30 illustrated in FIG. A memory 52 that stores data corresponding to the amount of rotation of the rotary shaft 15a and the amount of rotation of the third reflecting mirror 45 shown in the data received by the data receiving unit 51, and the third reflecting mirror 45 are provided. A step motor 53 as a drive source that rotates in the direction of the arrow in FIG. 5, a gear (not shown) that transmits the rotational driving force of the step motor 53 to the third reflecting mirror 45, and a motor drive that controls the drive of the step motor 53. And a mirror control unit 55 that controls these in an integrated manner. When the data receiving unit 51 receives data indicating the amount of rotation of the rotating shaft 15 a, the mirror control unit 55 extracts data corresponding to the data from the memory 52. Next, the mirror control unit 55 outputs a control signal indicating the rotation amount of the third reflecting mirror 45 indicated in the data extracted from the memory 52 to the motor driving unit 54. Then, the motor control unit 54 to which the control signal is input drives the step motor 53 so that the third reflection mirror 45 is rotated by the rotation amount indicated by the control signal.

As described above, the third reflecting mirror 45 is rotated in the direction of the arrow in FIG. 5 by a necessary amount, and a suitable mirror angle θ ₂ is realized. Here, the preferred mirror angle θ ₂ means the tilt angle of the mirror at which the projection angle of the image light is a suitable angle, and the preferred projection angle is that the image light is mainly reflected toward the observer. It means the projection angle that is incident on the screen at the incident angle. Accordingly, the mirror angle θ ₂ is correlated with the screen angle θ ₁ (FIG. 2), which is correlated with the position of the observer. As a result, the mirror angle θ ₂ , the screen angle θ ₁ , and The three positions of the observer are in a correlated relationship. Specifically, the further away the observer is from the screen body 10, the smaller the screen angle θ ₁ and the larger the mirror angle θ ₂ . On the other hand, the closer the observer is to the screen body 10, the larger the screen angle θ ₁ and the smaller the mirror angle θ ₂ .

As described above, in the image display system of this example, not only the screen angle θ ₁ but also the screen angle θ ₁ and the mirror angle θ ₂ (= projection angle of image light) are optimized according to the position of the observer. Will be.

(Embodiment 3)
Hereinafter, another example of the embodiment of the video display system of the present invention will be described. The video display system of this example is common to the video display system of Embodiment 1 in that it includes a screen unit and a projector. Further, the screen unit has the same configuration as that described in the first embodiment except that the control unit 33 shown in FIG. 4 can output all or part of the data extracted from the memory 35 shown in FIG. It has a configuration. Therefore, description of the screen unit is omitted by using the same names and symbols as those in the first embodiment.

  As shown in FIG. 7, the video display system of this example includes a support base 61 on which a projector 60 is placed. The support base 61 is rotatably provided on the pedestal 62, and the projector 60 is placed on the upper surface of the support base 61. Further, the support base 61 is rotated in the direction of the arrow in FIG. 7 by the support base rotation mechanism 63 shown in FIG. 8, and accordingly, the projector 60 is tilted up and down, and the image light projection angle is optimized. The

8 receives data indicating the amount of rotation of the rotation shaft 15a (= the amount of rotation of the screen body 10) output from the control unit 33 of the screen rotation mechanism 30 shown in FIG. The receiving unit 64, the memory 65 storing the data corresponding to the rotation amount of the rotating shaft 15 a and the rotation amount of the support base 61 indicated in the data received by the data reception unit 61, and the support base 61 are rotated. A step motor 66 as a driving source to be moved, a gear (not shown) that transmits the rotational driving force of the step motor 66 to the support base 61, a motor drive unit 67 that controls the drive of the step motor 66, and these are comprehensively controlled. And a support base control unit 68. When the data receiving unit 64 receives data indicating the amount of rotation of the rotary shaft 15 a, the support base control unit 68 extracts data corresponding to the data from the memory 65. Next, the support base control unit 68 outputs a control signal indicating the amount of rotation of the support base 64 indicated in the data extracted from the memory 65 to the motor drive unit 67. Then, the motor control unit 67 to which the control signal is input drives the step motor 66 so that the support base 61 is rotated by the rotation amount indicated by the control signal. Or by just turning amount necessary support base 61 rotates in the direction of the arrow in FIG. 7, the projector 60 is tilted suitable angle theta _3. Here, the preferable inclination angle θ ₃ of the projector 60 means an angle at which the projection angle of the image light is preferable, and the preferable projection angle of the image light reflects the image light mainly toward the observer. It means a projection angle that is incident on the screen at an incident angle. Therefore, the tilt angle θ ₃ of the projector 60 is correlated with the screen angle θ ₁ (FIG. 2) that is correlated with the position of the observer. As a result, the tilt angle θ _{3 of} the projector 60 is The screen angle θ ₁ and the position of the observer are correlated. Specifically, as the observer moves away from the screen body 10, the screen angle θ ₁ decreases and the tilt angle θ ₃ of the projector 60 increases. On the other hand, the closer the observer is to the screen body 10, the larger the screen angle θ ₁ and the smaller the tilt angle θ ₃ of the projector 60.

As described above, in the image display system of this example, not only the screen angle θ ₁ but also the screen angle θ ₁ and the projector tilt angle θ ₃ (= projection angle of image light) depend on the position of the observer. Will be optimized.

(Embodiment 4)
Hereinafter, another example of the embodiment of the video display system of the present invention will be described. The video display system of this example shares the basic configuration with the video display system of the first embodiment. The video display system of this example is different from that of the first embodiment in that the projector includes a distortion correction mechanism shown in FIG.

A distortion correction mechanism 70 shown in FIG. 9 receives data indicating the amount of rotation of the rotary shaft 15a (= the amount of rotation of the screen body 10) output from the control unit 33 of the screen rotation mechanism 30 shown in FIG. 71, correction data in which a rotation amount of the rotation shaft 15a indicated in the data received by the data receiving unit 71 is associated with a correction value for correcting distortion of an image projected on the screen is stored. When data indicating the amount of rotation of the rotary shaft 15 a is received by the memory 72 and the data receiving unit 71, the data extracting unit 73 that extracts correction data corresponding to the data from the memory 72 and the data extracting unit 73 extract the correction data. And an image data processing unit 74 for processing the image data based on the correction data. Note that the projector in this example and the projector in the first embodiment are common in that a light valve that modulates light according to image data to form image light is provided. However, in the projector in this example, the image light is formed according to the image data corrected according to the screen angle θ ₁ shown in FIG. Therefore, an image without distortion is always provided even if the screen angle θ ₁ is changed according to the position of the observer. Note that a specific distortion correction process based on the correction value extracted from the memory 72 is the same as that in the related art, and thus further description is omitted. In short, the video display system of the present example is characterized in that the screen angle θ ₁ determined based on the position of the observer is _one of distortion correction parameters.

Note that by correcting the data associated with the correction value stored in the memory 72, it is also possible to perform distortion correction based on another parameter. For example, as described above, the control unit 33 of the screen rotation mechanism 30 illustrated in FIG. 3 specifies the current position of the observer prior to extraction of data indicating the rotation amount of the rotation shaft 15a. Accordingly, correction data in which the correction value is associated with the observer's position is stored in the memory 72 shown in FIG. 9, and data indicating the observer's position is output from the control unit 30 shown in FIG. With this configuration, distortion correction can be performed using the position of the observer as one of the parameters. However, since the screen angle θ ₁ is determined according to the position of the observer, the correction result is the same even when the position of the observer is used as a parameter.

1 is a schematic diagram illustrating a schematic configuration of a video display system according to a first embodiment. It is a typical side view of the screen main body shown in FIG. It is a schematic diagram which shows the principle which pinpoints an observer's position based on the detection result of a human sensitive sensor. It is a block diagram which shows the structure of a screen rotation mechanism. FIG. 6 is a schematic cross-sectional view showing a schematic configuration of a projector that constitutes a video display system of Embodiment 2. It is a block diagram which shows the structure of a mirror rotation mechanism. It is a schematic diagram which shows the structure outline of the video display system of Embodiment 3. It is a block diagram which shows the structure of a support stand rotation mechanism. It is a block diagram which shows the structure of a distortion correction mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 60 Projector 2 Screen unit 10 Screen main body 15a, 15b Rotating shaft 17 Human sensor 18 Movable mask 30 Screen rotating mechanism 43 First reflecting mirror 44 Second reflecting mirror 45 Third reflecting mirror 50 Mirror rotating mechanism 61 support base 63 support base rotation mechanism 70 distortion correction mechanism

Claims (11)

A projector that projects image light;
A screen on which an image is projected by the projector;
Observer detection means for detecting the position of an observer observing the image projected on the screen;
A screen display system comprising screen rotation means for rotating the screen about a predetermined rotation axis in accordance with the position of the observer detected by the observer detection means. Storage means for storing data associating the position of the observer detected by the observer detection means with the amount of rotation of the screen;
The screen rotation means extracts data corresponding to the position of the observer detected by the observer detection means from the storage means, and rotates the screen by the rotation amount indicated in the extracted data. The video display system according to claim 1. Storage means for storing data associating the position of the observer detected by the observer detection means with the amount of rotation of the screen;
A rotation amount detecting means for detecting a current rotation amount of the screen;
The screen rotation means includes a rotation amount indicated in data extracted from the storage means based on the position of the detector detected by the observer detection means, and the screen detected by the rotation amount detection means. The video display system according to claim 1, wherein the screen is rotated by a difference from a current rotation amount. A rotatable reflecting mirror that reflects the image light toward the screen;
4. The video display system according to claim 1, further comprising a reflection mirror rotating unit that rotates the reflection mirror to change a projection angle of the image light. 5. Storage means for storing data in which the position of the observer detected by the observer detection means, the rotation amount of the screen, and the rotation amount of the reflection mirror are associated with each other;
When data indicating both or one of the position of the observer and the amount of screen rotation is input, the mirror rotating unit extracts data corresponding to the input data from the storage unit, and the extracted data The video display system according to claim 4, wherein the reflection mirror is rotated by an amount of rotation shown in FIG. A rotatable support base on which the projector is mounted;
4. The video according to claim 1, further comprising: a support table rotating unit that changes a projection angle of the image light by tilting a projector mounted by rotating the support table. 5. Display system. Storage means for storing data in which the position of the observer detected by the observer detection means, the rotation amount of the screen, and the rotation amount of the support base are associated with each other;
When the data indicating both or one of the position of the observer and the amount of rotation of the screen is input, the support table rotating unit extracts data corresponding to the input data from the storage unit and is extracted. The video display system according to claim 6, wherein the support base is rotated by an amount of rotation indicated in the data. The projector associates one or both of the observer position and the screen rotation amount detected by the observer detection means with a correction value for correcting distortion of an image projected on the screen. Correction data storage means for storing correction data;
Data extraction means for extracting correction data corresponding to the input data from the correction data storage means when data indicating both or one of the observer position and the screen rotation amount is input from the outside;
Data processing means for processing input image data based on the correction data extracted by the data extraction means;
8. The video display system according to claim 1, further comprising image light forming means for forming image light projected on the screen based on the image data processed by the data processing means. A screen body on which an image is projected by a projector;
Observer detection means for detecting the position of an observer observing the image projected on the screen body;
A screen unit having screen rotation means for rotating the screen body about a predetermined rotation axis in accordance with the position of the observer detected by the observer detection means.   The screen unit according to claim 9, wherein both or one of the position of the observer detected by the observer detection unit and the rotation amount of the screen by the screen rotation unit can be output to the outside. A projector that forms image light based on image data and projects the formed image light toward a screen,
Stores correction data in which one or both of the position of the observer and the amount of screen rotation detected by the observer detection means are associated with a correction value for correcting distortion of an image projected on the screen. Correction data storage means for performing,
Data extraction means for extracting corresponding correction data from the correction data storage means when data indicating both or one of the position of the observer and the amount of rotation of the screen is input from the outside;
Data processing means for processing image data based on the correction data extracted by the data extraction means;
A projector having image light forming means for forming image light projected on the screen based on the image data processed by the data processing means.

Images