JP2006201328A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of switching and projecting a projected image of large screen size and a projected image of an ordinary screen size with easy operation, and realizing the shortening of a distance from a projection surface to the projector. <P>SOLUTION: The projector is equipped with: an illuminator 100; liquid crystal devices 400R, 400G and 400B; a projection optical system 600; a mode setting device 702 for setting what screen mode, a large screen mode or an ordinary screen mode, the projector is used in; and a zoom device 704 having a function for setting the zoom ratio of the projection optical system 600. The projector can be used in such an arrangement state that light from the projection optical system 600 is projected to an opposite side to a screen SCR. It is equipped with a reflection mirror 30 for reflecting the light from the projection optical system 600 to the screen SCR. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector.

  In recent years, large-screen displays using a liquid crystal system or a plasma system have been widely used in the world. However, in these large screen displays, the screen size is fixed at, for example, 60 inches, so that the screen size is too small when viewing content (for example, movies) that is preferable to be viewed at the large screen size. There is a problem that it is unsatisfactory, and there is a problem that when viewing content (for example, news) that is preferably viewed at a normal size, the screen size is too large and the user is tired.

  On the other hand, in a projector that projects and displays a projected image on a screen, the screen size can be changed by changing the installation position of the projector and changing the projection distance from the projection surface to the projector. When watching movies, the screen size is set to a large screen size (for example, 80 inches), and when watching news, the screen size is set to a normal screen size (for example, 40 inches). Thus, the above problem can be solved (for example, see Patent Document 1).

  8 and 9 are diagrams illustrating the relationship between the projection distance and the screen size in the projector 10a. In the projector 10a, as shown in FIGS. 8 and 9, as a method of changing the screen size, as described above, the projection distance from the screen SCR as the projection surface to the projector 10a by changing the installation position of the projector 10a. In addition to the first method for changing the first and second methods, there are a second method for changing the zoom ratio of the projection optical system 600a, and a third method that combines these first and second methods.

JP 2002-162690 A

However, in the case of the first method and the third method, there is a problem that the installation position of the projector needs to be changed every time the content to be projected changes, and the work is complicated.
In the case of the second method, that is, the method of changing the screen size by changing only the zoom ratio of the projection optical system without changing the installation position of the projector, such a problem is eliminated, but the large screen size (for example, In order to project 80 inches), it is necessary to increase the distance from the projection plane to the projector to some extent (for example, 2 m to 8 m.), So it is necessary to install the projector at a certain distance from the projection plane. There was a problem that a projector, a power cable, a signal cable, etc. were in the way.

  Therefore, the present invention provides a projector that can switch and project a large screen size projection image and a normal screen size projection image with a simple operation, and can reduce the distance from the projection surface to the projector. The purpose is to do.

  A projector according to the present invention includes an illumination device, an electro-optic modulation device that modulates light from the illumination device according to image data, and a projection optical system that projects light modulated by the electro-optic modulation device onto a projection surface. A mode setting device for setting which screen mode to use in a plurality of screen modes including at least a large screen mode and a normal screen mode, and a zoom ratio of the projection optical system according to the set screen mode And a zoom device having a function of setting the projection optical system, wherein the projection optical system can be used in an arrangement state in which light from the projection optical system is projected on the side opposite to the projection plane, The apparatus further comprises a reflecting mirror that reflects light from the system toward the projection plane.

  For this reason, according to the projector of the present invention, the zoom device having the function of setting the zoom ratio of the projection optical system can be used to switch between a large screen size projection image and a normal screen size projection image with a simple operation. It becomes possible to do.

  Further, according to the projector of the present invention, the light from the projection optical system is once reflected by the reflector and projected onto the projection plane by the action of the reflecting mirror that reflects the light from the projection optical system toward the projection plane. As a result, the distance from the projection surface to the projector can be shortened.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a reflecting mirror tilt angle adjusting device having a function of setting the tilt angle of the reflecting mirror with respect to the optical axis of the projection optical system according to the set screen mode.

  With such a configuration, it is possible to project a projected image at an appropriate position on the projection surface for each screen mode by the function of the above-described reflecting mirror tilt angle adjusting device.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a reflector arrangement position adjusting device having a function of setting the arrangement position of the reflector along the optical axis of the projection optical system according to the set screen mode. .

  With this configuration, the function of the above-described reflecting mirror arrangement position adjusting device complements the zoom ratio setting function by the projection optical system, and widens the adjustment range of the size of the projected image projected on the projection surface. Is possible.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a trapezoidal distortion correction device that corrects the trapezoidal distortion of the projected image projected on the projection surface in accordance with the set screen mode.

  With this configuration, the trapezoidal distortion can be appropriately corrected according to the set screen size by the function of the trapezoidal distortion correction apparatus described above.

  In the projector according to the aspect of the invention, it is preferable that the mode setting device has a function of setting a screen mode based on a user operation.

  With this configuration, the screen mode can be freely set based on the user's operation.

  In the projector according to the aspect of the invention, it is preferable that the mode setting device has a function of setting a screen mode based on the content of the content to be projected.

  In this case, additional information indicating what the content is may be added to the image information, and the content content may be determined based on the additional information, or from the image information itself included in the content. The content may be determined.

  In the projector according to the aspect of the invention, it is preferable that the position of the projection area on the projection plane can be set for each of the plurality of screen modes.

  With this configuration, the position of the projection area can be set for each of the plurality of screen modes, so that a projection image can be projected at a desired position for each of the plurality of screen modes.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a memory that holds information regarding the zoom ratio of the projection optical system in each screen mode.

  With this configuration, when the screen mode setting is changed by the mode setting device, the zoom ratio of the projection optical system can be set quickly and appropriately by referring to the memory described above. As a result, the screen mode can be quickly switched, and the usability of the projector is improved.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a memory that holds information regarding the zoom ratio of the projection optical system and information regarding the tilt angle of the reflecting mirror in each screen mode.

  With this configuration, when the screen mode setting is changed by the mode setting device, the zoom ratio of the projection optical system and the tilt angle of the reflecting mirror can be quickly and appropriately set by referring to the memory described above. Is possible. As a result, the screen mode can be quickly switched, and the usability of the projector is improved.

  In the projector according to the aspect of the invention, it is preferable that the projector further includes a memory that holds information on the zoom ratio of the projection optical system in each screen mode, information on the tilt angle of the reflecting mirror, and information on the arrangement position of the reflecting mirror.

  With this configuration, when the screen mode setting is changed by the mode setting device, the zoom ratio of the projection optical system, the tilt angle of the reflecting mirror, and the arrangement position of the reflecting mirror can be quickly determined by referring to the memory described above. And it becomes possible to set appropriately. As a result, the screen mode can be quickly switched, and the usability of the projector is improved.

  Hereinafter, a projector according to the present invention will be described with reference to embodiments shown in the drawings.

[Embodiment 1]
First, the projector according to the first embodiment will be described with reference to FIGS.
FIG. 1 is a block diagram of an optical system of a projector 10 according to the first embodiment. FIG. 2 is an electric system block diagram of the projector 10 according to the first embodiment. 3 to 5 are diagrams illustrating a projection state of the projector 10 according to the first embodiment. FIG. 3A is a view of the projection state in the large screen mode viewed from the side, and FIG. 3B is a view of the projection state in the normal screen mode viewed from the side. 4A is a diagram of the projection state in the large screen mode as viewed from the user side, and FIG. 4B is a diagram of the projection state in the normal screen mode as viewed from the user side. FIG. 5A is a view of the projection state in the large screen mode as viewed from above, and FIG. 5B is a view of the projection state in the normal screen mode as viewed from above.

  As shown in FIG. 1, the projector 10 according to the first embodiment has an illuminating device 100 and an illumination light beam from the illuminating device 100 separated into three color lights of red, green, and blue as an optical system to be illuminated. A guided color separation light guide optical system 200, and three liquid crystal devices 400R, 400G, and 400B as electro-optic modulation devices that modulate each of the three color lights from the color separation light guide optical system 200 according to image information; A cross dichroic prism 500 that combines the color lights modulated by the three liquid crystal devices 400R, 400G, and 400B, and a projection optical system 600 that projects the light combined by the cross dichroic prism 500 onto a projection surface such as a screen SCR. ing. These various optical components are accommodated in the housing 20.

  The illumination device 100 includes a light source device 110 that emits an illumination light beam that is substantially parallel to the illuminated region side, and a plurality of first small lenses that divide the illumination light beam emitted from the light source device 110 into a plurality of partial light beams. One lens array 120, a reflection mirror 125 that reflects a plurality of partial light beams divided by the first lens array 120 at an angle of 90 °, and a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array 120. A second lens array 130 having a lens, a polarization conversion element 140 that aligns an illumination light beam emitted from the light source device 110 with a non-uniform polarization direction into one type of linearly polarized light, and each partial light beam from the polarization conversion element 140 is an illuminated area. The superimposing lens 150 for superimposing is provided.

  The light source device 110 includes an ellipsoidal reflector 114, an arc tube 112 having a light emission center in the vicinity of the first focal point of the ellipsoidal reflector 114, and a collimation that converts the focused light reflected by the ellipsoidal reflector 114 into substantially parallel light. And a lens 118. The arc tube 112 is provided with an auxiliary mirror 116 that reflects light emitted from the arc tube 112 toward the illuminated area toward the ellipsoidal reflector 114.

The color separation light guide optical system 200 includes two dichroic mirrors 210 and 220, three reflection mirrors 230, 240 and 250, and relay lenses 260 and 270.
Field lenses 280R, 280G, and 280B are provided on the light incident surface sides of the liquid crystal devices 400R, 400G, and 400B, respectively.

  As shown in FIG. 2, the projector 10 according to the first embodiment includes an AD converter 710 that performs A / D conversion of analog image information input from a personal computer, a video, in addition to the optical system configured as described above. A video decoder 712 that decodes analog image information input from a device, and an image processing circuit that performs necessary processing on image information A / D converted by the A / D converter 710 or image information decoded by the video decoder 712 714, an image correction circuit 716 that performs necessary correction on the image information processed by the image processing circuit 714, and the liquid crystal devices 400R, 400G, and 400B that drive the image information that has been corrected by the image correction circuit 716. A liquid crystal drive circuit 718 for converting the drive signal into a drive signal, a power source 724 for controlling light emission of the arc tube 112, and And a ballast 726.

  The projector 10 according to the first embodiment includes a mode setting device 702 that sets which of the large screen mode and the normal screen mode is used, and the projection optical system 600 according to the set screen mode. A zoom device 704 having a function of setting the zoom ratio, a reflecting mirror 30 that reflects light from the projection optical system 600 toward the projection plane, and an operation panel 722 that receives input of screen mode setting information and other various information. And a memory 720 that holds information regarding the zoom ratio of the projection optical system 600 in each screen mode.

The mode setting device 702 sets the screen mode based on the mode information M ₁ operated by the user, and sets the screen mode based on the mode information M ₂ based on the contents recognized by the image processing circuit 714. Do.
The image correction circuit 716 includes a trapezoidal distortion correction device, a γ correction device, a color correction device, and the like that correct the trapezoidal distortion of the projected image projected on the screen SCR in accordance with the screen mode set by the mode setting device 702 (all of them). (Not shown)).

  As shown in FIGS. 3 to 5, the projector 10 is used in an arrangement state in which light from the projection optical system 600 is projected on the side opposite to the screen SCR.

  For this reason, according to the projector 10 according to the first embodiment, the zoom device 704 having a function of setting the zoom ratio of the projection optical system 600 allows a large screen size projection image (FIG. 3A) to be easily operated. 4 (a) and 5 (a)) and a normal screen size projection image (see FIG. 3 (b), FIG. 4 (b) and FIG. 5 (b)) can be switched and projected. It becomes possible.

  Further, according to the projector 10 according to the first embodiment, the light from the projection optical system 600 is once reflected by the reflection mirror 30 due to the action of the reflection mirror 30 that reflects the light from the projection optical system 600 toward the projection surface. Therefore, the distance from the screen SCR to the projector 10 can be shortened.

  The projector 10 according to the first embodiment employs a short focus lens as the projection optical system 600. Further, a reflecting mirror configured to reflect light from the projection optical system 600 obliquely upward is employed as the reflecting mirror 30.

  For this reason, according to the projector 10 according to the first embodiment, the projector 10 can be projected from the screen SCR to the reflecting mirror 30 of the projector 10 while enabling projection of a plurality of screen sizes of a large screen size and a normal screen size. It can be installed in an arrangement state such that the distance is within 1 m.

  The projector 10 according to the first embodiment can appropriately correct the trapezoidal distortion according to the set screen size by the function of the trapezoidal distortion correction apparatus described above.

The trapezoidal distortion correction device stores trapezoidal distortion correction parameters for each screen mode at the standard installation position of the projector 10 as initial setting values. For this reason, as long as the projector 10 is installed and used at the standard installation position, the trapezoidal distortion is automatically corrected, so that the user does not need to perform the keystone distortion correction by manual adjustment.
On the other hand, when the user installs and uses the projector 10 at a position different from the standard installation position, the keystone distortion is not automatically corrected, so the user performs the keystone correction by manual adjustment. In this case, by storing correction parameters related to manual adjustment in the trapezoidal distortion correction apparatus, when the projector 10 is used at the same installation position, trapezoidal distortion is automatically corrected.
Although these correction parameters are stored in the trapezoidal distortion correction apparatus, they can also be stored in the memory 720.

  In the projector 10 according to the first embodiment, the mode setting device 702 has a function of setting the screen mode based on the user's operation, and therefore sets the screen mode based on the user's operation. It can be done freely.

  In the projector 10 according to the first embodiment, the mode setting device 702 has a function of setting the screen mode based on the content of the content to be projected. Settings can be made. In this case, additional information indicating what the content is can be added to the image information, and the content can be determined based on the additional information, or the content information can be determined from the image information itself included in the content. The contents can also be judged.

  In the projector 10 according to the first embodiment, the position of the projection area on the screen SCR can be set for each of a plurality of screen modes. For this reason, since the position of the projection area can be set for each of the plurality of screen modes, the projection image can be projected at a desired position for each of the plurality of screen modes.

  In this case, the position of the projection area on the screen SCR can be set for each screen mode by manual adjustment by the user. In this case, the correction parameters related to the manual adjustment are stored in the memory 720 for each screen mode, so that when the projector 10 is used later, a projected image can be projected at a desired position for each screen mode. It becomes possible.

  For example, as shown in FIGS. 3 and 4, the position of the base of the projected image in the normal screen mode (40 inches) is set to the same height as the position of the base of the projected image in the large screen mode (80 inches). Is possible.

  As described above, the projector 10 according to the first embodiment includes a memory that holds information regarding the zoom ratio of the projection optical system 600 in each screen mode. Therefore, the mode setting device 702 changes the screen mode setting. In some cases, the zoom ratio can be quickly and appropriately set by referring to the memory 720. As a result, the screen mode can be quickly switched, and the usability of the projector 10 is improved.

[Embodiment 2]
Next, the projector 12 according to the second embodiment will be described with reference to FIGS.
FIG. 6 is an electrical block diagram of the projector 12 according to the second embodiment. FIG. 7 is a diagram illustrating a projection state of the projector 12 according to the second embodiment. FIG. 7A is a diagram showing the projection state in the large screen mode from the side, and FIG. 7B is a diagram showing the projection state in the normal screen mode from the side.

  The projector 12 according to the second embodiment basically has the same configuration as the projector 10 according to the first embodiment, but the tilt angle of the reflecting mirror and the arrangement position of the reflecting mirror can be adjusted. This is different from the projector 10 according to the first embodiment. That is, in the projector 12 according to the second embodiment, as shown in FIG. 6, the reflecting mirror having a function of setting the tilt angle of the reflecting mirror 30 with respect to the optical axis of the projection optical system 600 according to the set screen mode. An inclination angle adjusting device 706 and a reflecting mirror arrangement position adjusting device 708 having a function of setting the arrangement position of the reflecting mirror 30 along the optical axis of the projection optical system 600 according to the set screen mode are further provided. Yes.

  As described above, the projector 12 according to the second embodiment is different from the projector 10 according to the first embodiment in that the tilt angle of the reflecting mirror and the arrangement position of the reflecting mirror can be adjusted. As in the case of the projector 10, the zoom device 704 having the function of setting the zoom ratio of the projection optical system 600 allows a large screen size projected image (see FIG. 7A) and a normal operation with a simple operation. It is possible to switch and project a projection image having a screen size (see FIG. 7B). Further, the light from the projection optical system 600 is reflected once by the reflecting mirror 30 and projected onto the screen SCR by the action of the reflecting mirror 30 that reflects the light from the projection optical system 600 toward the screen SCR. The distance from the screen SCR to the projector 12 can be shortened.

  Further, since the projector 12 according to the second embodiment includes the reflector tilt angle adjusting device 706 and the reflector arrangement position adjusting device 708 described above, the function of the reflector tilt angle adjusting device 706 (projection area adjustment) is provided. Position adjustment function) and the function of the reflector arrangement position adjustment device 708 (projection area size adjustment function (complementary function of the zoom ratio setting function by the projection optical system)), the screen SCR is positioned at an appropriate position for each screen mode. Projected images can be projected.

  In the projector 12 according to the second embodiment, an optical system that reflects light from the projection optical system 600 as the reflecting mirror 30 obliquely upward and reflects at a larger angle than in the case of the projector 10 according to the first embodiment. Is adopted.

  For this reason, projection of a screen size of 80 inches as a large screen size and a screen size of 40 inches as a normal screen size is possible, but the distance from the screen SCR to the reflecting mirror 30 of the projector 12 is set in the projector 12 according to the first embodiment. Thus, the projector 10 can be arranged in an arrangement state such that the distance is even shorter than that of the projector 10 according to the above.

  In the projector 12 according to the second embodiment, the memory 730 includes information regarding the tilt angle of the reflecting mirror 30 and information regarding the arrangement position of the reflecting mirror 30 in addition to information regarding the zoom ratio of the projection optical system 600 in each screen mode. Holding. Therefore, when the screen mode setting is changed by the mode setting device 702, the zoom ratio of the projection optical system 600, the tilt angle of the reflecting mirror 30, and the arrangement position of the reflecting mirror 30 can be quickly determined by referring to the memory 730. It becomes possible to set appropriately. As a result, the screen mode can be quickly switched, and the usability of the projector 12 is improved.

The memory 730 stores the zoom ratio of the projection optical system 600 for each screen mode at the standard installation position / standard projection position of the projector 12, the tilt angle of the reflecting mirror 30, and the arrangement position of the reflecting mirror 30 as initial setting values. Therefore, as long as the projector 12 is installed at the standard installation position and is used with the projection area set at the standard projection position, the user can use these (the zoom ratio of the projection optical system 600, the tilt angle of the reflecting mirror 30 and the reflection angle). The projector can be used without adjusting the arrangement position of the mirror 30.
On the other hand, even when the user installs and uses the projector 12 at a position different from the standard installation position, or when the user installs and uses the projector 12 at the standard installation position, the projection area is the standard projection position. When using in a different position, the user adjusts these values by manual adjustment. In this case, by storing these values relating to the manual adjustment in the memory 730, it is not necessary to manually adjust these values when the projector 12 is used under the same conditions.

  As described above, the projector according to the embodiment of the invention has been described. However, the invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the scope of the invention. For example, the following modifications are possible.

(1) The projectors 10 and 12 according to the above-described embodiments are suitable for installation in a low position in a room, and the reflecting mirror 30 reflects light from the projection optical system 600 obliquely upward. Although the projector is configured as described above, the present invention is not limited to this. For example, the projector may be a projector that is suitable for use in a ceiling-suspended state, and the reflecting mirror may be configured to reflect light from the projection optical system obliquely downward. The projector may be a projector that is suitable for installation on the side surface side, and is configured such that the reflecting mirror reflects light from the projection optical system toward an oblique side.

(2) In the projector 12 according to the second embodiment, the position of the projection area is set for each of a plurality of screen modes using the reflector tilt angle adjusting device 706 and the reflector arrangement position adjusting device 708. However, the present invention is not limited to this. For example, in addition to this, the position of the projection area may be set for each of the plurality of screen modes by adjusting the lens shift amount in the lens shift device.

(3) The projectors 10 and 12 of the above embodiments may include a camera for taking a projected image. This makes it possible to perform trapezoidal distortion correction more quickly and accurately. In addition, the projection position can be set more quickly and accurately.

(4) Although the projectors 10 and 12 of the above embodiments use the three liquid crystal devices 400R, 400G, and 400B, the present invention is not limited to this. One liquid crystal device, two liquid crystal devices, or four or more liquid crystal devices can also be used.

(5) Although the projectors 10 and 12 in the above embodiments use the liquid crystal devices 400R, 400G, and 400B as electro-optic modulation devices, the present invention is not limited to this. In general, the electro-optic modulation device may be any device that modulates incident light in accordance with image information, and a micromirror light modulation device or the like may be used. For example, a DMD (digital micromirror device) (trademark of TI) can be used as the micromirror light modulator.

(6) Although the projectors 10 and 12 of the above embodiments use transmissive liquid crystal devices, the present invention is not limited to this. A reflective liquid crystal device can also be used.

1 is a block diagram of an optical system of a projector 10 according to a first embodiment. FIG. 2 is an electric system block diagram of the projector according to the first embodiment. FIG. 3 is a diagram illustrating a projection state of the projector according to the first embodiment. FIG. 3 is a diagram illustrating a projection state of the projector according to the first embodiment. FIG. 3 is a diagram illustrating a projection state of the projector according to the first embodiment. FIG. 6 is an electrical block diagram of a projector 12 according to a second embodiment. FIG. 10 is a diagram illustrating a projection state of the projector 12 according to the second embodiment. The figure which shows the relationship between the projection distance and screen size in the projector 10a. The figure which shows the relationship between the projection distance and screen size in the projector 10a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10a, 12 ... Projector, 20, 22 ... Housing, 30 ... Reflector, 32 ... Reflector support part, 50 ... Installation stand, 100 ... Illuminating device, 110 ... Light source device, 112 ... Arc tube, 114 ... Ellipse Surface reflector, 116 ... auxiliary mirror, 118 ... collimating lens, 120 ... first lens array, 125, 230, 240, 250 ... reflecting mirror, 130 ... second lens array, 140 ... polarization conversion element, 150 ... superimposing lens, 200 ... color separation light guide optical system, 210, 220 ... dichroic mirror, 260, 270 ... relay lens, 280R, 280G, 280B ... field lens, 400R, 400G, 400B ... liquid crystal device, 500 ... cross dichroic prism, 600 ... projection Optical system 702 ... Mode setting device 704 ... Zoom device 706 ... Reflector tilt angle adjustment 708 ... A / D converter, 712 ... Video decoder, 714 ... Image processing circuit, 716 ... Image correction circuit, 718 ... Liquid crystal driving circuit, 720,730 ... Memory, 722 ... Operation panel, 724 ... power supply, 726 ... ballast, SCR ... screen, _{M 1,} M 2 _... mode information, S 1 _... zoom ratio control signal, S 2 _... tilt angle control signal, S 3 _... position control signal

Claims (10)

A lighting device;
An electro-optic modulator that modulates light from the illumination device according to image data;
A projection optical system that projects the light modulated by the electro-optic modulation device onto a projection surface;
A mode setting device for setting which screen mode to use in a plurality of screen modes including at least a large screen mode and a normal screen mode;
A zoom device having a function of setting a zoom ratio of the projection optical system according to a set screen mode;
A projector that can be used in an arrangement state in which light from the projection optical system is projected on the opposite side of the projection plane;
A projector further comprising a reflecting mirror that reflects light from the projection optical system toward the projection plane. The projector according to claim 1, wherein
A projector further comprising: a reflecting mirror tilt angle adjusting device having a function of setting an tilt angle of the reflecting mirror with respect to an optical axis of the projection optical system according to a set screen mode. The projector according to claim 1 or 2,
A projector further comprising a reflecting mirror arrangement position adjusting device having a function of setting an arrangement position of the reflecting mirror along an optical axis of the projection optical system according to a set screen mode. The projector according to any one of claims 1 to 3,
A projector further comprising a trapezoidal distortion correction device that corrects trapezoidal distortion of a projected image projected on the projection surface in accordance with a set screen mode. The projector according to any one of claims 1 to 4,
The mode setting device has a function of setting a screen mode based on a user's operation. The projector according to any one of claims 1 to 4,
The mode setting device has a function of setting a screen mode based on the content of content to be projected. In the projector according to any one of claims 1 to 6,
A projector characterized in that a position of a projection area on the projection plane can be set for each of the plurality of screen modes. The projector according to claim 1, wherein
A projector further comprising a memory for holding information relating to a zoom ratio of the projection optical system in each screen mode. The projector according to claim 2,
A projector further comprising: a memory that holds information about a zoom ratio of the projection optical system and information about an inclination angle of the reflecting mirror in each screen mode. The projector according to claim 3, wherein
A projector further comprising: a memory that holds information about a zoom ratio of the projection optical system in each screen mode, information about an inclination angle of the reflecting mirror, and information about an arrangement position of the reflecting mirror.