JP2005067554A - Video display system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display system that makes it easy to view a video by increasing the display size of the video without reducing the indoor space and changing the display position of the video.
An image display system that displays an image in an automobile in which a front seat 1A and a rear seat 1B are installed, and is disposed under the front seat 1A that projects image light for projecting the image. Attached to the projector 100, the first mirror 10 that reflects the image light projected from the projector 100, the screen 20 that receives the image light reflected by the first mirror 10 and displays the image, and the front seat 1A, And a screen holder 50 that rotatably holds the screen 20.
[Selection] Figure 1

Description

  The present invention relates to a video display system using, for example, a projector for displaying video such as movies and television broadcasts, and more particularly to an in-vehicle video display system.

  In recent years, with the spread of RSE (Rear Seat Entertainment), which can enjoy images and music from various media such as DVD (Digital Versatile Disk) and CD (Compact Disc) on the rear seats of automobiles, its purpose is to use in RSE The video display system for car interiors is becoming popular.

  There are two types of such video display systems. One of the types is a standard direct-view type in which an image source is displayed on a display so that the image source can be directly viewed (for example, see Patent Document 1), and the other is a relatively small display body. It is a projection type in which an image source is displayed on a screen by enlarging and projecting by an optical system process such as a lens (see, for example, Patent Document 2).

FIG. 22 is an explanatory diagram for explaining the video display system of Patent Document 1.
The video display system of Patent Document 1 is a direct view type, and includes a display device 903 that displays an image source so that it can be directly viewed.

The display device 903 includes a liquid crystal display, and is installed on the rear side of the headrest portion 902 of the front seat 904 of the automobile with the liquid crystal display facing rearward. A cushion 901 is installed on the front side of the headrest 902.
An occupant seated in the backseat seat views the video by directly viewing the video displayed on the liquid crystal display of the display device 903.

On the other hand, the video display system of Patent Document 2 is of a projection type and includes a projector (generally called a projector) that projects video light for projecting video.
This projector is embedded in the backrest portion of the front seat, and the image light projected from the projector is reflected by the reflecting mirror and projected on the screen as an image.

Here, the structure of the conventional projector is demonstrated (for example, refer nonpatent literature 1).
FIG. 23 is a configuration diagram showing a configuration of a conventional projector.
The projector includes a light source 1002, an illumination optical system unit 1003, a projection image forming unit 1004, a projection optical system unit 1005, a video input unit 1007, and a projection lens unit 1006.

The video input unit 1007 acquires a video signal indicating a movie or TV broadcast video from a device such as a DVD player or a TV tuner, and outputs the video signal to the projection image forming unit 1004.
The illumination optical system unit 1003 converts the light output from the light source 1002 into light having characteristics suitable for video light, and outputs the light to the projection image forming unit 1004.

  The projection image forming unit 1004 includes a transmissive liquid crystal panel, displays an image corresponding to the video signal output from the video input unit 1007 on the transmissive liquid crystal panel, and displays the image. Video light is generated by transmitting light output from the illumination optical system unit 1003 to the panel. Then, the projection image forming unit 1004 outputs the image light generated in this way to the projection optical system unit 1005.

The projection optical system unit 1005 optically processes the video light output from the projection image forming unit 1004 and outputs it to the projection lens unit 1006.
The projection lens unit 1006 is configured by combining a plurality of lenses, and adjusts the focus so that the focal point is aligned with the screen, or optically changes the display size of the image displayed on the screen.
Japanese Patent Laid-Open No. 3-10476 JP-T-2001-506772 (FIG. 21) O plus E Vol.22, No.3 (March 2000) pp. 295-340

  However, the video display system disclosed in Patent Document 1 has a problem in that the video display size is limited by the size of the headrest unit 902 and the video is difficult to see. Further, if the display size is forcibly made larger than the size of the headrest portion 902, the weight of the display device 903 increases, and thus the safety at the time of collision is impaired.

  Furthermore, in the video display system of Patent Document 2, in order to embed the projector in the backrest portion of the front seat, it is necessary to secure a space for installing the projector by increasing the thickness of the backrest portion. There is a problem of becoming narrower. Further, in the video display system of Patent Document 2, since the screen is fixed, there is a problem that it may be difficult for the user to see the video displayed on the screen. As a result, the user is forced to take an unreasonable posture so as to match the viewpoint with the screen during viewing.

  Therefore, the present invention has been made in view of such problems, and makes the image easy to view by increasing the display size of the image without reducing the indoor space and making the display position of the image variable. An object is to provide a video display system.

  In order to achieve the above object, a video display system according to the present invention is a video display system that displays a video in a space in which a first seat and a second seat are installed. A light projecting unit disposed under the first seat for projecting light, a reflecting unit for reflecting the image light projected from the projecting unit, and an image received by the image light reflected by the reflecting unit And a holding means attached to the first or second seat and rotatably holding the screen. For example, the video display system is disposed in an interior space of an automobile having the first seat as a front seat and the second seat as a rear seat.

  As a result, image light is projected from the light projecting means to the screen via the reflecting means, and the image is displayed on the screen. Therefore, the image display size is increased according to the size of the screen. Easy to see. Furthermore, since the screen is relatively light even if its size is increased, the display size of the video can be increased without sacrificing safety. In addition, since the light projecting means is disposed under the first seat, it is possible to prevent the space in which the first seat and the second seat are installed, that is, the interior space of the vehicle from being narrowed. The interior space can be used effectively. Furthermore, since the screen is rotatably held, the user can point the screen toward his / her viewpoint, and the video displayed on the screen can be further easily seen.

The video display system may further include moving means for moving the screen along a backrest portion of the first or second seat.
Thereby, since the screen moves along the backrest portion, the user can adjust the screen to the height of his / her viewpoint, and the video displayed on the screen can be more easily seen.

  Here, the holding means and the moving means are configured so that the movement along the backrest portion of the screen and the rotation are interlocked. For example, when the screen moves upward along the backrest portion, the holding means and the moving means rotate the screen so that the angle between the screen and the backrest portion increases with the movement. And when the said screen moves below along a backrest part, the said screen rotates so that the said angle may become small with the movement.

  As a result, the angle between the screen and the backrest portion increases as the screen moves upward, and the angle decreases as the screen moves downward. This makes it easier to see the image projected on the screen.

  The video display system further changes according to the angle between the screen and the backrest portion of the first or second seat, which changes according to the rotation of the screen, and according to the movement of the screen. Screen state detecting means for detecting at least one of the position of the screen and the reflecting means according to the detection result of the screen state detecting means so that the position of the image projected on the screen is kept constant. The image position fluctuation suppressing means for changing at least one of the direction in which the image light is reflected and the position of the reflecting means may be provided.

  As a result, when the screen is moved or rotated, the image position variation suppressing means changes the direction and position of the reflecting means according to its operation, so that the position of the image displayed on the screen is kept constant. It is possible to easily prevent the position of the image displayed on the screen from changing without the user having to change the direction and position of the reflecting means.

  The video display system further includes a reclining angle detection unit that detects a reclining angle of the first or second seat to which the screen is attached, and the video position variation suppression unit includes the video displayed on the screen. So that the position of the reflecting means is reflected and at least one of the direction of reflecting the image light of the reflecting means and the position of the reflecting means according to the detection results of the screen state detecting means and the reclining angle detecting means. It is good also as a feature to change.

  Thus, when the first or second seat to which the screen is attached is reclined, the image position variation suppressing means changes the direction and position of the reflecting means according to the reclining angle, and is displayed on the screen. Therefore, it is possible to easily prevent the position of the image displayed on the screen from fluctuating without bothering the user to change the direction and position of the reflecting means.

  Here, the light projecting means specifies the optical path length of the image light between the light projecting means and the screen based on the detection results of the screen state detecting means and the reclining angle detecting means, and projects the image light May be adjusted according to the optical path length.

  Thus, when the screen is moved or rotated, or when the first or second seat to which the screen is attached is reclined, the light projecting means adjusts the focal length according to the state of the screen and the reclining angle. Therefore, it is possible for the user to easily display a clear image without adjusting the focal length of the light projecting means.

  Further, the light projecting means performs a correction process on the projected video light so that the video projected on the screen is not distorted based on the detection results of the screen state detecting means and the reclining angle detecting means. It is good also as performing.

  As a result, even if the screen is moved or rotated, or the first or second seat to which the screen is attached is reclined, the image displayed on the screen is not distorted, so that the image is displayed more clearly. be able to.

  The video display system further reflects the video light reflected by the reflecting means according to a change in at least one of a direction of reflecting the video light of the reflecting means and a position of the reflecting means. Based on the detection results of the reflection relay means directed to the screen, the screen state detection means and the reclining angle detection means, the direction and position of the reflection means are changed to change the optical path of the image light. A switching means for switching between a first optical path from the reflection means to the screen via the reflection relay means and a second optical path from the reflection means to the screen without passing through the reflection relay means. This may be a feature. For example, the switching unit is configured to detect a first correction amount required for the correction process in the first optical path and a second optical path based on detection results of the screen state detection unit and the reclining angle detection unit. The second correction amount necessary for the correction process is compared, and when the second correction amount is smaller than the first correction amount, the optical path of the image light is switched from the first optical path to the second optical path. Any one of the direction and the position of the reflecting means is changed. Alternatively, the switching unit derives a correction amount necessary for the correction process in the first optical path based on detection results of the screen state detection unit and the reclining angle detection unit, and the correction amount is predetermined. When it is larger than the threshold value, one of the direction and the position of the reflecting means is changed so that the optical path of the image light is switched from the first optical path to the second optical path.

  Thereby, since it is selected whether or not the reflection by the reflection relay means is used so that the correction amount becomes small, it is possible to avoid excessive correction processing and make the image displayed on the screen clearer.

Here, when the image light is not projected from the light projecting means, the holding means holds the screen so as to lie down on a backrest portion of the first or second seat to which the screen is attached. It is good also as storing.
Thereby, when the system is not used, the screen is stored face down, so that the protrusion by the screen can be suppressed and the space can be used more effectively.

The video display system may further include a light shielding unit that surrounds an optical path of the video light so as to suppress an influence of external light on the video light.
Thereby, since the influence of external light is suppressed, the image projected on the screen can be made clearer.

The video display system may further include a housing that includes the light projecting unit and the reflecting unit.
Thereby, a light projection means and a reflection means can be protected.

  Here, the video display system further compares the reclining angle detected by the reclining angle detection means with a predetermined threshold value, and determines that the reclining angle is equal to or greater than the predetermined threshold value, A stop means for stopping the projection of the image light from the light projecting means may be provided.

As a result, when the reclining angle at which the image cannot be projected on the screen is set to the predetermined threshold value, the first or second seat to which the screen is attached is reclined to the threshold value. In this case, since the projection of the image light from the light projecting means is stopped, it is possible to save energy by stopping the unnecessary projection of the image light.
The present invention can also be realized as a video display method for displaying video.

  The video display system of the present invention can increase the video display size and make the video easier to see without sacrificing safety. In addition, since the light projecting means is disposed under the first seat, it is possible to prevent the space in which the first seat and the second seat are installed from being narrowed, and the space can be effectively used. Can be used. Further, since the screen is held so as to be rotatable, the user can point the screen toward his / her own viewpoint, and the video displayed on the screen can be further easily seen.

(Embodiment 1)
The video display system according to the first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1A is a configuration diagram showing an arrangement configuration of the video display system according to the first embodiment of the present invention.
This video display system makes the video easier to see by enlarging the display size of the video without reducing the space in the car and making the display position of the video variable. A projector 100 that projects light, a first mirror 10a that reflects the image light, a second mirror 10b that is reflected by the first mirror 10a and further reflects the image light, and a mirror drive that changes the orientation of the first mirror 10a Unit 10, a screen 20 that receives the image light reflected by the second mirror 10 b and displays an image, a screen holder 50 that holds the screen 20, and the front seat 1 </ b> A (second mirror 10 b) of the screen 20. A screen angle detector 61 for detecting an angle (screen angle) and a reclining unit for detecting a reclining angle of the front seat 1A And a grayed angle detector 62.

  The projector 100 is fixed to the front seat 1 </ b> A below the front seat 1 </ b> A in such a manner that the projection port through which the image light is projected is directed rearward. The projector 100 acquires a video signal indicating a movie or TV broadcast video from a device such as a DVD player or a TV tuner mounted on the automobile, and projects video light for projecting the video.

FIG. 1B is a cross-sectional view of the backrest portion of the front seat 1A.
A substantially rectangular recess is formed on the back side of the back portion of the front seat 1A, and the second mirror 10b is attached to the bottom surface of the recess.

  The screen 20 is a so-called rear projection screen, and displays the image light emitted from the back surface by the reflection by the second mirror 10b as an image on the front surface. Thereby, an occupant (user) sitting on the rear seat 1 </ b> B can appreciate the video displayed on the screen 20.

  The screen holder 50 is formed in a substantially cylindrical shape as a whole, and is attached to the upper back of the front seat 1 </ b> A in a state in which the axis is along the left-right direction of the front seat 1 </ b> A. The screen holder 50 is configured to hold the side of the screen 20 and rotate the screen 20 around the side.

  As described above, in the present embodiment, the projector 100 is disposed under the front seat 1A, and the image light from the projector 100 is transmitted to the front seat using the reflection by the first mirror 10a and the second mirror 10b. When the image is displayed on the screen 20 attached to the screen 20 attached to 1A, the image can be displayed in a large size without narrowing the interior space of the vehicle, and the image can be easily viewed by the user. In the present embodiment, since the screen 20 is attached to the front seat 1A via the screen holder 50, the user seated on the rear seat 1B can manually turn the screen 20 to rotate his / her own. The video displayed on the screen 20 can be further easily viewed toward the viewpoint.

  Furthermore, in the present embodiment, the position of the image displayed on the screen 20 (the relative position of the image with respect to the screen 20) varies or the image is distorted due to the rotation of the screen 20 and the reclining of the front seat 1A. The projector 100 corrects the projected image light and controls the mirror drive unit 10 to change the direction of the first mirror 10a.

  That is, in the present embodiment, the screen angle detector 61 and the reclining angle detector 62 are provided in order to cause the projector 100 to perform the correction process and control.

FIG. 2 is a circuit configuration diagram showing a circuit configuration of the screen angle detector 61.
The screen angle detector 61 includes a resistance wire 3, a power source 1 that applies a predetermined DC voltage to both ends of the resistance wire 3, and one end of the screen that is in contact with the resistance wire 3. A contact 4 to be moved and a voltage detector 2 that detects a potential difference between the other end of the contact 4 and one end of the resistance wire 3 are provided. Here, when the screen 20 is rotated, the screen holder 50 is also rotated accordingly, and the contact portion of the contact 4 to the resistance wire 3 is moved. Thereby, the voltage detection unit 2 detects a voltage corresponding to the rotation of the screen 20.

  That is, the screen angle detector 61 outputs the voltage signal detected by the voltage detector 2 as a screen angle signal indicating the screen angle.

  The reclining angle detector 62 has a circuit configuration similar to that of the screen angle detector 61, and outputs a voltage signal that changes in accordance with the reclining angle of the front seat 1A as a reclining angle signal.

FIG. 3 is a block diagram illustrating a configuration of the projector 100 that performs the correction process on the image light and the control on the mirror driving unit 10.
The projector 100 includes a light source 101, an illumination optical system unit 102, a projection image forming unit 103, a projection optical system unit 104, a video input unit 106, a projection lens unit 105, and a processing unit 107.

The video input unit 106 acquires the video signal and outputs the video signal to the projection image forming unit 103.
The illumination optical system unit 102 converts the light output from the light source 101 into light having characteristics suitable for video light, and outputs the light to the projection image forming unit 103.

  The projection image forming unit 103 includes a transmissive liquid crystal panel, displays an image corresponding to the video signal output from the video input unit 106 on the transmissive liquid crystal panel, and displays the transmissive liquid crystal on which the image is displayed. Image light is generated by transmitting light output from the illumination optical system unit 102 to the panel. Then, the projection image forming unit 103 outputs the image light generated in this way to the projection optical system unit 104.

  In addition, the projection image forming unit 103 according to the present embodiment performs the above-described correction processing on the video light in response to an instruction from the processing unit 107. That is, the projection image forming unit 103 performs trapezoidal correction described later on the image displayed on the transmissive liquid crystal panel.

The projection optical system unit 104 optically processes the video light output from the projection image forming unit 103 and outputs the processed image light to the projection lens unit 105.
The projection lens unit 105 is configured by combining a plurality of lenses, and adjusts the focal length or optically changes the display size of the image displayed on the screen in accordance with an instruction from the processing unit 107.

  The processing unit 107 acquires the screen angle signal output from the screen angle detector 61 to specify the screen angle, and acquires the reclining angle signal output from the reclining angle detector 62 to specify the reclining angle. .

  Then, the processing unit 107 derives the orientation of the first mirror 10a so that the relative position of the image projected on the screen 20 stays at a predetermined position based on the specified screen angle and reclining angle, The mirror driving unit 10 is controlled so that the first mirror 10a is directed in the derived direction.

  Further, the processing unit 107 derives a correction amount required for trapezoidal correction based on the specified screen angle and reclining angle, and notifies the projection image forming unit 103 of the correction amount to execute the keystone correction.

  The processing unit 107 derives a focal length from the projector 100 to the screen 20 based on the specified screen angle and reclining angle, and instructs the projection lens 206 of the focal length.

FIG. 4 is an explanatory diagram for explaining a state in which the orientation of the first mirror 10 a is changed by the rotation of the screen 20.
As shown in FIG. 4, if the orientation of the first mirror 10 a is fixed when the user rotates the screen 20 upward so that the user points the screen 20 toward his / her viewpoint, the image is projected on the screen 20. The relative position of the recorded image will move.

  However, in the present embodiment, the screen angle detector 61 detects the screen angle, and the projector 100 controls the mirror driving unit 10 and changes the direction of the first mirror 10a according to the detection result. When the screen 20 is rotated, the relative position of the image displayed on the screen 20 can be kept at a predetermined position.

  In other words, in the present embodiment, the user can arbitrarily set the orientation of the screen 20 while maintaining the relative position of the image at a predetermined position without bothering to adjust the angle of the first mirror 10a.

FIG. 5 is an explanatory diagram for explaining a state in which the orientation of the first mirror 10a is changed by the reclining of the front seat 1A.
As shown in FIG. 5, when an occupant seated on the front seat 1A reclines the front seat 1A, if the orientation of the first mirror 10a is fixed, the relative image displayed on the screen 20 The position will move.

  However, in the present embodiment, the reclining angle detector 62 detects the reclining angle, and the projector 100 controls the mirror driving unit 10 to change the direction of the first mirror 10a according to the detection result. Even when the seat 1A is reclined, the relative position of the image displayed on the screen 20 can be kept at a predetermined position.

Next, the above-described trapezoid correction performed by the projection image forming unit 103 of the projector 100 will be described.
FIG. 6 is an explanatory diagram for explaining the trapezoid correction.
For example, as shown in FIG. 6A, when the projector 100 irradiates the image light along the direction inclined from the orthogonal direction of the screen 20, the difference in the optical path length (optical path length a1−optical path) in each part of the image light The length a2) occurs. As a result, on the screen, the image displayed on the part that has received the image light through the long optical path length (a1) is larger than the image displayed on the part that has received the image light through the short optical path length (a2). End up.

  That is, when the keystone correction is not performed, as shown in FIG. 6B, the shape 20A of the image to be projected by the projector 100 is a rectangle, whereas the shape 20B of the image projected on the screen 20 is the bottom side. Becomes a trapezoid shorter than the upper side. That is, the image is distorted.

  Therefore, in the present embodiment, the projection image forming unit 103 of the projector 100 displays on the transmissive liquid crystal display panel so that the shape of the image displayed on the screen 20 is a rectangle based on an instruction from the processing unit 107. The trapezoid correction is performed so that the shape of the image to be formed becomes a trapezoid whose base is longer than the top.

  As a result, as shown in FIG. 6B, the shape 20C of the image that the projector 100 intends to project becomes a trapezoid, and the shape 20D of the image projected on the screen 20 becomes a rectangle.

  As described above, in the present embodiment, since the trapezoidal correction is performed according to the screen angle and the reclining angle, it is possible to suppress the distortion of the image displayed on the screen 20 and make it easier for the user to see the image.

FIG. 7 is a flowchart showing the operation of the projector 100 in the present embodiment.
First, the projector 100 specifies the screen angle by acquiring the screen angle signal from the screen angle detector 61, and specifies the reclining angle by acquiring the reclining angle signal from the reclining angle detector 62 (step S100). .

  Next, the projector 100 derives the focal length, the keystone correction amount, and the direction of the first mirror 10a based on the specified screen angle and reclining angle (step S102).

  Then, the projector 100 sets the focal length to the focal length derived in step S102 (step S104), performs trapezoidal correction by the correction amount derived in step S102 (step S106), and sets the mirror driving unit 10 to By controlling, the direction of the first mirror 10a is set to the direction derived in step S102 (step S108).

  In the present embodiment, the projector 100 is installed under the front seat 1A. However, the projector 100 may be installed under the rear seat 1B with the projection opening facing forward.

FIG. 8 is a configuration diagram showing an arrangement configuration of the video display system when the projector 100 is installed under the rear seat 1B.
In the present embodiment, even when the projector 100 is arranged below the rear seat 1B in this way, the same operational effects as described above are obtained.

(Embodiment 2)
Hereinafter, a video display system according to a second embodiment of the present invention will be described with reference to the drawings.

FIG. 9 is a configuration diagram showing an arrangement configuration of the video display system according to the second embodiment of the present invention.
As in the first embodiment, this video display system increases the video display size without reducing the space in the car, and makes the video display position variable so that the video is easy to see. A projector 100a that projects image light for projecting an image, a first mirror 10a that reflects the image light, a second mirror 10b that is reflected by the first mirror 10a and further reflects the image light, and a first mirror A mirror driving unit 10 that changes the direction of the mirror 10a, a screen 20 that receives the image light reflected by the second mirror 10b, displays an image, a screen holder 50a that holds the screen 20, and the screen 20 and the screen holder 50a. Two guide rails 70 for moving the front seat 1A up and down on the back side of the front seat 1A, the screen 20 and the screen holder. It includes position along the guide rail 70 immediately 50a and screen position detector 63 for detecting the (screen position), before a reclining angle detector 62 for detecting a reclining angle of the seat 1A.

  Here, among the components provided in the present embodiment, components having the same configuration and function as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  Similar to the projector 100 according to the first embodiment, the projector 100a is fixed to the front seat 1A under the front seat 1A in such a manner that the projection port through which the image light is projected is directed rearward. The projector 100a obtains a video signal indicating a movie or television broadcast video from a device such as a DVD player or a TV tuner mounted on the automobile, and projects video light for projecting the video.

  The screen holder 50a is formed in a substantially cylindrical shape as a whole, and is attached to the back side of the front seat 1A via a guide rail 70 in a state where the shaft is along the left-right direction of the front seat 1A. It has been. The screen holder 50 a holds the side of the screen 20.

  The two guide rails 70 are attached to the back surface of the front seat 1A in such a manner that the longitudinal direction is directed in the vertical direction in parallel with each other.

FIG. 10 is a side view of the guide rail 70, the screen 20, and the screen holder 50a.
Each of the two guide rails 70 is formed with an elongated slot 70h along the longitudinal direction. The two guide rails 70 are supported such that the end of the screen holder 50a is inserted into the long hole 70h and the screen holder 50a is sandwiched between them.

  The two guide rails 70 move the screen holder 50a and the screen 20 along the direction of the force when the force in the direction along the longitudinal direction is applied to the screen holder 50a or the screen 20. When such movement is performed, the angle between the screen 20 and the guide rail 70 is kept constant during the movement.

  As described above, in the present embodiment, the projector 100a is disposed under the front seat 1A, and the image light from the projector 100a is transmitted to the front seat using the reflection by the first mirror 10a and the second mirror 10b. When the image is displayed on the screen 20 attached to the screen 20 attached to 1A, the image can be displayed in a large size without narrowing the interior space of the vehicle, and the image can be easily viewed by the user. In the present embodiment, since the screen 20 is attached to the back side of the front seat 1A via the screen holder 50a and the guide rail 70, the user sitting on the rear seat 1B can By manually moving the screen 20 up and down, the screen 20 can be adjusted to the height of its own viewpoint, and the image displayed on the screen 20 can be further easily seen.

Further, in the present embodiment, the position of the image displayed on the screen 20 (relative position of the image with respect to the screen 20) fluctuates or the image is distorted due to the vertical movement of the screen 20 and the reclining of the front seat 1A. The projector 100a corrects the projected image light and controls the mirror driving unit 10 to change the direction of the first mirror 10a.
That is, in the present embodiment, the screen position detector 63 and the reclining angle detector 62 are provided in order to cause the projector 100a to perform the above correction processing and control.

  Here, the screen position detector 63 and the reclining angle detector 62 have the same circuit configuration as the circuit configuration of the screen angle detector 61 of the first embodiment, and the reclining angle detector 62 is the same as that of the front seat 1A. A voltage signal that changes according to the reclining angle is output as a reclining angle signal, and the screen position detector 63 outputs a voltage signal that changes according to the screen position as a screen position signal.

  FIG. 11 is a block diagram illustrating a configuration of a projector 100a that performs correction processing for image light and control for the mirror driving unit 10. As illustrated in FIG.

  The projector 100a includes a light source 101, an illumination optical system unit 102, a projection image forming unit 103, a projection optical system unit 104, a video input unit 106, a projection lens unit 105, and a processing unit 108.

  Here, the light source 101, the illumination optical system unit 102, the projection image forming unit 103, the projection optical system unit 104, the video input unit 106, and the projection lens unit 105 in the present embodiment are the first embodiment. Since it has the same structure and function as what was equipped in the projector 100 of a form, detailed description is abbreviate | omitted.

  The processing unit 108 acquires the screen position signal output from the screen position detector 63 to specify the screen position, and acquires the reclining angle signal output from the reclining angle detector 62 to specify the reclining angle.

  Then, the processing unit 108 derives the orientation of the first mirror 10a so that the relative position of the image projected on the screen 20 remains at a predetermined position based on the identified screen position and reclining angle, and The mirror driving unit 10 is controlled so that the first mirror 10a is directed in the derived direction.

  Further, the processing unit 108 derives a correction amount required for trapezoidal correction based on the specified screen position and reclining angle, notifies the projection image forming unit 103 of the correction amount, and is the same as in the first embodiment. Perform keystone correction.

  The processing unit 108 derives a focal length from the projector 100 a to the screen 20 based on the identified screen position and reclining angle, and instructs the projection lens 206 of the focal length.

  The projection lens unit 105 adjusts the focal length and optically changes the display size of the image displayed on the screen 20 in accordance with an instruction from the processing unit 108.

FIG. 12 is an explanatory diagram for explaining how the orientation of the first mirror 10a changes as the screen 20 moves up and down.
As shown in FIG. 12, when the user moves the screen 20 downward so as to match the height of his / her viewpoint, if the orientation of the first mirror 10a is fixed, the screen 20 The relative position of the image projected on the screen will move.

  However, in the present embodiment, the screen position detector 63 detects the screen position, and the projector 100a controls the mirror driving unit 10 to change the direction of the first mirror 10a according to the detection result. When the screen 20 is moved, the relative position of the image projected on the screen 20 can be kept at a predetermined position.

  That is, in the present embodiment, the user can arbitrarily set the height of the screen 20 while keeping the relative position of the video at a predetermined position without bothering to adjust the angle of the first mirror 10a.

  Further, in the present embodiment, as in the first embodiment, the reclining angle detector 62 detects the reclining angle, and the projector 100a controls the mirror driving unit 10 according to the detection result, and the first mirror 10a Since the direction is changed, the relative position of the image displayed on the screen 20 can be kept at a predetermined position even when the user reclines the front seat 1A.

  Further, in the present embodiment, as in the first embodiment, since the keystone correction is performed according to the screen position and the reclining angle, the distortion of the image displayed on the screen 20 is suppressed, and the image can be more easily viewed by the user. can do.

FIG. 13 is a flowchart showing the operation of the projector 100a in the present embodiment.
First, the projector 100a specifies the screen position by acquiring the screen position signal from the screen position detector 63, and specifies the reclining angle by acquiring the reclining angle signal from the reclining angle detector 62 (step S200). .

  Next, the projector 100a derives the focal length, the keystone correction amount, and the direction of the first mirror 10a based on the specified screen position and reclining angle (step S202).

  Then, the projector 100a sets the focal length to the focal length derived in step S202 (step S204), performs trapezoidal correction by the correction amount derived in step S202 (step S206), and sets the mirror driving unit 10 to By controlling, the direction of the first mirror 10a is set to the direction derived in step S202 (step S208).

  In the present embodiment, the projector 100a is installed under the front seat 1A. However, as in the modification of the first embodiment, the projection port is directed forward under the rear seat 1B. May be installed.

(Embodiment 3)
Hereinafter, an image display system according to a third embodiment of the present invention will be described with reference to the drawings.

FIG. 14 is a configuration diagram showing an arrangement configuration of the video display system according to the third embodiment of the present invention.
As in the first embodiment, this video display system increases the video display size without reducing the space in the car and makes the video display position variable so that the video is easy to see. A projector 100b that projects image light for projecting an image, a first mirror 10a that reflects the image light, a second mirror 10b that is reflected by the first mirror 10a and further reflects the image light, and a first mirror A mirror driving unit 10 that changes the direction of 10a, a screen 20 that receives image light reflected by the second mirror 10b, displays an image, a screen holder 50b that holds the screen 20, and a screen 20 and a screen holder 50b. Two guide rails 70a for moving the front seat 1A up and down on the back side of the front seat 1A, and the front seat 1 of the screen 20 A screen angle detector 61 for detecting an angle (screen angle) with respect to the (second mirror 10b), and a screen position detector 63 for detecting positions (screen positions) of the screen 20 and the screen holder 50b along the guide rails 70a. And a reclining angle detector 62 for detecting the reclining angle of the front seat 1A.

  Here, among the components provided in the present embodiment, components having the same configuration and function as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  Similarly to the projector 100 according to the first embodiment, the projector 100b is fixed to the front seat 1A under the front seat 1A so that a projection port for projecting image light is directed rearward. Then, the projector 100b acquires a video signal indicating a movie or TV broadcast video from a device such as a DVD player or a TV tuner mounted on the automobile, and projects video light for projecting the video.

  The two guide rails 70a are attached to the back surface of the front seat 1A in parallel with each other so that the longitudinal direction is directed in the vertical direction.

FIG. 15 is a schematic side view of the guide rail 70a, the screen 20, and the screen holder 50b.
Each of the two guide rails 70a supports both ends of the screen holder 50b, and when a force in the direction along the longitudinal direction is applied to the screen holder 50b or the screen 20 held by the screen holder 50b. The screen holder 50b and the screen 20 are moved along the direction of the force.

  Further, the guide rail 70a and the screen holder 50b are arranged such that when the screen 20 moves upward in the longitudinal direction as described above, the screen 20 is arranged in the longitudinal direction so that the angle between the screen 20 and the guide rail 70a is increased. When moving downward, the angle between the screen 20 and the guide rail 70a is reduced.

FIG. 16 is a perspective view of the screen holder 50b.
The screen holder 50b includes two large gears 51, a connecting column 53 that connects these large gears 51 at the center, a small gear 52 that meshes with each large gear 51, and these small gears 52 at the center of each other. A shaft column 54 to be connected, a holding piece 55 for holding the large gear 51 and the small gear 52 in mesh, and an arm for fixing the one end side to the center of the large gear 51 and holding the screen 20 on the other end side. 56.

  In such a screen holder 50 b, the large gear 51 is rotated by the rotation of the small gear 52, and both arms 56 rotate the screen 20 about the center of the large gear 51 by the rotation.

FIG. 17 is a detailed side view of the guide rail 70a and the screen holder 50b.
As shown in FIG. 17, each of the two guide rails 70a is formed with an elongated slot 70h along the longitudinal direction. A plurality of protrusions are formed on the inner surface of the long hole 70h, and the small gear 52 of the screen holder 50b is inserted into the long hole 70h so as to mesh with these protrusions.

  Accordingly, when the screen 20 or the screen holder 50b is moved by applying a force upward (in the direction of the arrow in FIG. 17A), the small gear 52 rotates clockwise, and the rotation causes the large gear to rotate. 51 rotates counterclockwise, and the arm 56 rotates with this rotation. As a result, as shown in FIG. 17B, the angle between the screen 20 and the guide rail 70a is increased.

  As described above, in the present embodiment, the projector 100b is arranged under the front seat 1A, and the image light from the projector 100b is transmitted to the front seat using the reflection by the first mirror 10a and the second mirror 10b. When the image is displayed on the screen 20 attached to the screen 20 attached to 1A, the image can be displayed in a large size without narrowing the interior space of the vehicle, and the image can be easily viewed by the user. In the present embodiment, since the screen 20 is attached to the back side of the front seat 1A via the screen holder 50b and the guide rail 70a, if the screen 20 is manually moved upward, the movement Accordingly, the screen angle changes so as to increase, and when the screen 20 is manually moved downward, the screen angle changes so as to decrease along with the movement. The arrangement of the screen 20 can be changed with a wider degree of freedom than in the first and second embodiments, and the image displayed on the screen 20 can be made easier to see.

  In other words, in this embodiment, it is possible to make the range in the vertical direction in which an image is easy to see wider than in the first and second embodiments.

  Furthermore, in the present embodiment, the position of the image displayed on the screen 20 (the relative position of the image with respect to the screen 20) is changed by the vertical movement and rotation of the screen 20 and the reclining of the front seat 1A. The projector 100b performs correction processing on the projected image light and controls the mirror driving unit 10 to change the direction of the first mirror 10a so as not to cause distortion.

  That is, in the present embodiment, the screen angle detector 61, the reclining angle detector 62, and the screen position detector 63 are provided in order to cause the projector 100b to perform the correction processing and control.

  Here, the screen angle detector 61, the reclining angle detector 62, and the screen position detector 63 have the same circuit configuration as that of the screen angle detector 61 according to the first embodiment. That is, the screen angle detector 61 outputs a voltage signal that changes according to the screen angle as a screen angle signal, and the reclining angle detector 62 outputs a voltage signal that changes according to the reclining angle of the front seat 1A. The screen position detector 63 outputs a voltage signal that changes according to the screen position as a screen position signal.

  FIG. 18 is a block diagram illustrating a configuration of a projector 100 b that performs correction processing on image light and control on the mirror driving unit 10.

  The projector 100b includes a light source 101, an illumination optical system unit 102, a projection image forming unit 103, a projection optical system unit 104, a video input unit 106, a projection lens unit 105, and a processing unit 109.

  Here, the light source 101, the illumination optical system unit 102, the projection image forming unit 103, the projection optical system unit 104, the video input unit 106, and the projection lens unit 105 in the present embodiment are the first embodiment. Since it has the same structure and function as what was equipped in the projector 100 of a form, detailed description is abbreviate | omitted.

  The processing unit 109 acquires the screen position signal output from the screen position detector 63 to specify the screen position, and acquires the reclining angle signal output from the reclining angle detector 62 to specify the reclining angle, Further, the screen angle signal output from the screen angle detector 61 is acquired to specify the screen angle.

  Then, the processing unit 109 derives the orientation of the first mirror 10a so that the relative position of the image displayed on the screen 20 remains at a predetermined position based on the specified screen position, reclining angle, and screen angle. At the same time, the mirror driving unit 10 is controlled so that the first mirror 10a is directed in the derived direction.

  Further, the processing unit 109 derives a correction amount required for trapezoidal correction based on the specified screen position, reclining angle, and screen angle, and notifies the projection image forming unit 103 of the correction amount, in the first embodiment. The same trapezoidal correction is executed.

The processing unit 109 derives a focal length from the projector 100b to the screen 20 based on the specified screen position, reclining angle, and screen angle, and instructs the projection lens 206 of the focal length.
The projection lens unit 105 adjusts the focal length and optically changes the display size of the image displayed on the screen 20 in accordance with an instruction from the processing unit 109.

FIG. 19 is an explanatory diagram for explaining how the orientation of the first mirror 10a changes as the screen 20 moves up and down and rotates.
As shown in FIG. 19, when the user moves the screen 20 downward so as to match the height and orientation of his / her viewpoint, the screen angle decreases with the movement. And if the direction of the 1st mirror 10a is fixed, the relative position of the image projected on the screen 20 will move.

  However, in the present embodiment, the screen position detector 63 detects the screen position, the screen angle detector 61 detects the screen angle, and the projector 100b controls the mirror driving unit 10 according to these detection results. Since the orientation of the first mirror 10a is changed, the relative position of the image displayed on the screen 20 can be kept at a predetermined position even when the user moves and rotates the screen 20.

  That is, in the present embodiment, the user can arbitrarily set the height and angle of the screen 20 while keeping the relative position of the image at a predetermined position without bothering to adjust the angle of the first mirror 10a. .

  Further, in the present embodiment, as in the first embodiment, the reclining angle detector 62 detects the reclining angle, and the projector 100b controls the mirror driving unit 10 according to the detection result, and the first mirror 10a Since the direction is changed, the relative position of the image displayed on the screen 20 can be kept at a predetermined position even when the user reclines the front seat 1A.

  In the present embodiment, the projector 100b is installed under the front seat 1A. However, as in the modification of the first embodiment, the projection port is directed forward under the rear seat 1B. May be installed.

(Modification)
Next, a modification of the video display system in the present embodiment will be described.
The screen holder of the video display system according to this modification is configured such that the screen angle can be arbitrarily set regardless of the screen position, that is, the position on the guide rail 70a.

  Furthermore, the projector 100b of the video display system according to the present modification varies the control content for the mirror driving unit 10 according to the correction amount of the keystone correction.

  That is, the processing unit 109 of the projector 100b derives a correction amount necessary for trapezoidal correction based on the reclining angle, the screen angle, and the screen position, but projects image light on the screen 20 using the reflection of the second mirror 10b. Correction amount (first correction amount) required when the image light is to be corrected and correction amount (second correction amount) required when image light is directly projected from the first mirror 10a to the screen 20 without using the reflection of the second mirror 10b. Quantity). The processing unit 109 that has derived the first correction amount and the second correction amount compares these correction amounts, and if the first correction amount is equal to or smaller than the second correction amount, the processing unit 109 109 controls the mirror driving unit 10 to use the reflection of the second mirror 10b to set the direction of the first mirror 10a. On the other hand, when the first correction amount is larger than the second correction amount, the mirror driving unit 10 is controlled to set the direction of the first mirror 10a so as not to use the reflection of the first mirror 10a.

  FIG. 20 is an explanatory diagram for explaining how the processing unit 109 of the projector 100b changes the direction of the first mirror 10a according to the correction amount.

  First, when the screen 20 is above the front seat 1A and the screen angle is relatively small, the angle between the moving direction of the image light traveling toward the screen 20 and the screen 20 is the image light. The case where the light is reflected by the second mirror 10b is larger than the case where the light is not reflected by the second mirror 10b. That is, when the image light is not reflected by the second mirror 10b, the image light is projected on the screen 20 from an oblique direction.

  In the above case, the correction amount (first correction amount) when the reflection of the second mirror 10b is used is small, and the correction amount (second correction amount) when the reflection of the second mirror 10b is not used. growing.

  Therefore, when the processing unit 109 of the projector 100b in the present modification derives the first correction amount and the second correction amount, compares them, and determines that the first correction amount is smaller than the second correction amount, The direction of the first mirror 10a is set by controlling the mirror driver 10 so that the light is reflected by the second mirror 10b.

  Next, when the screen 20 is moved downward from the upper part of the front seat 1A and the screen angle is adjusted to be relatively large, the angle between the traveling direction of the image light traveling toward the screen 20 and the screen 20 is The case where the reflection of the second mirror 10b is used is smaller than the case where the reflection of the second mirror 10b is not used. That is, when the image light is reflected by the second mirror 10b, the image light is projected on the screen 20 from an oblique direction.

  In the above case, the correction amount (first correction amount) when the reflection of the second mirror 10b is used is large, and the correction amount (second correction amount) when the reflection of the second mirror 10b is not used. Get smaller.

  Therefore, the processing unit 109 of the projector 100b in the present modification derives the first correction amount and the second correction amount, compares them, and determines that the second correction amount is smaller than the first correction amount. The mirror driving unit 10 is controlled to change the direction of the first mirror 10a so that the light is projected directly from the first mirror 10a onto the screen 20 without being reflected by the second mirror 10b.

FIG. 21 is a flowchart showing the operation of the projector 100b according to this modification.
First, the projector 100b specifies the screen position by acquiring the screen position signal from the screen position detector 63, specifies the reclining angle by acquiring the reclining angle signal from the reclining angle detector 62, and further, the screen. The screen angle is specified by acquiring the screen angle signal from the angle detector 61 (step S300).

  Next, the projector 100b determines the focal length, the orientation of the first mirror 10a, and the first correction amount when the reflection of the second mirror 10b is used based on the specified screen position, reclining angle, and screen angle. At the same time, the focal length, the direction of the first mirror 10a, and the second correction amount when the reflection of the second mirror 10b is not used are derived (step S302).

  Then, the projector 100b compares the first correction amount and the second correction amount (step S304). Here, when it is determined that the first correction amount is equal to or smaller than the second correction amount (Y in step S304), the projector 100b sets the focal length to the second mirror among the focal lengths derived in step S302. The focal length is set when the reflection of 10b is used (step S306). Further, the projector 100b performs trapezoidal correction by the amount of the first correction derived in step S302 (step S308), and controls the mirror driving unit 10 to derive the direction of the first mirror 10a in step S302. Among the orientations, the orientation when the reflection of the second mirror 10b is used is set (step S310). As a result, the image light is projected onto the screen 20 from the projector 100b through the first mirror 10a and the second mirror 10b.

  On the other hand, when it is determined that the first correction amount is larger than the second correction amount (N in step S304), the projector 100b uses the reflection of the second mirror 10b among the focal lengths derived in step S302. It sets to the focal length when not (step S312). Further, the projector 100b performs trapezoidal correction corresponding to the second correction amount derived in step S302 (step S308), and controls the mirror driving unit 10 to derive the orientation of the first mirror 10a in step S302. Of the orientations, the orientation in the case where the reflection of the second mirror 10b is not used is set (step S310). As a result, the image light is projected from the projector 100b to the screen 20 via the first mirror 10a without passing through the second mirror 10b.

  As described above, in this modification, the screen angle can be arbitrarily set regardless of the screen position, so that the arrangement of the screen 20 can be more appropriately matched to the viewpoint of the user, and the image displayed on the screen 20 can be displayed. This makes it easier for the user to see.

  Further, in this modification, since it is selected whether or not the reflection of the second mirror 10b is used so that the correction amount of the trapezoid correction becomes small, a clear image can be displayed on the screen without performing an excessive trapezoid correction. 20 can be projected.

  That is, as shown in FIG. 20, even if the screen 20 is arranged so as to be substantially horizontal, trapezoidal correction is performed with a small correction amount, so that a clear image can be displayed on the screen 20. As a result, in this modification, by displaying the video of the game on the screen 20, it can be used as a table game, and usability can be improved.

  Furthermore, in this modification, if a strong material is used for the screen 20, the screen 20 can be used as a table, and a convenience such as displaying an image of a map on the screen 20 and placing an article such as a compass. Can be improved. Further, if the screen 20 has a touch panel function, the convenience can be further improved.

  In this modification, the first correction amount is compared with the second correction amount, and the use or non-use of the second mirror 10b is switched according to the result. However, the second correction amount is derived. Instead, the first correction amount may be compared with a predetermined threshold value, and use or non-use of the second mirror 10b may be switched according to the result.

  That is, when the processing unit 109 of the projector 100b derives the first correction amount, the processing unit 109 compares the first correction amount with a predetermined threshold value, and determines that the first correction amount is larger than the threshold value. The mirror driving unit 10 is controlled so that the light is not reflected by the second mirror 10b, and the angle of the first mirror 10a is set.

As described above, the video display system according to the present invention has been described using the first to third embodiments and the modifications, but the present invention is not limited to these.
For example, when the video display system is in operation, the screen angle is set or changed to a predetermined angle as described above, while when the video display system is not in operation, the screen angle is set to 0, that is, the screen. You may comprise a screen holder so that 20 can be turned down to the back of front seat 1A. As a result, when the video display system is not used, the screen 20 can be accommodated, and the protruding space of the screen 20 can be prevented and the interior space can be used extensively.

In Embodiments 1 to 3 and the modification, the image light is reflected by one or two mirrors and projected onto the screen 20. However, the number of mirrors used for reflection may be three or more. .
In this case, the setting of the optical path of the image light can be further facilitated, and the degree of freedom in the layout design of the image display system can be further increased.

  In the first to third embodiments and the modification, the projector receives the video signal from the outside, but the projector may generate the video signal. In this case, the projector has functions such as a DVD player and a TV tuner.

  Furthermore, in Embodiments 1 to 3 and the modification, the projector is provided with the processing unit, but the processing unit may be provided outside the projector.

  In the first to third embodiments and the modification, the change in the relative position of the image due to the change in the screen angle, the screen position, and the reclining angle is suppressed by changing the direction of the first mirror 10a. The position of the first mirror 10a may be changed instead of the direction of 10a, and the direction and position of the first mirror 10a may be changed.

  Further, in the first to third embodiments and the modification, the first mirror 10a and the mirror driving unit 10 and the projector are separated, but may be integrated. That is, the first mirror 10a, the mirror driving unit 10, and the projector are housed in a single housing, and are configured as an integral unit. Thereby, while being able to suppress the influence of external light, the 1st mirror 10a can be protected from a user's foot.

  In Embodiments 1 to 3 and the modification, a light shielding cover that surrounds the optical path of the image light from the projector to the screen 20 via the first mirror 10a and the second mirror 10b may be provided. The light shielding cover is made of a light shielding cloth, metal, plastic, or the like. As a result, the influence of external light on the image light can be suppressed, and the image can be made clearer and easier to see.

  Further, in the first to third embodiments and the modified examples, the focal length is adjusted by the projector according to the change in the screen angle, the screen position, and the reclining angle. However, the display size of the image displayed on the screen according to the change. The projector may adjust the display size of the image so that is kept constant. This makes it easier to see the video.

  In the first to third embodiments and the modifications, the screen 20 is moved or rotated by a manual operation by the user, but may be moved or rotated by electric drive. In this case, a screen drive unit that drives the screen 20 so as to change at least one of the screen angle and the screen position of the screen 20 and an operation unit that controls the screen drive unit according to an operation by the user are provided. Thereby, the user can set arbitrarily at least one of a screen angle and a screen position easily by operating an operation part.

  Furthermore, you may provide the automatic stop apparatus which stops the projection of the image light from a projector according to a reclining angle in Embodiment 1-3 and a modification. When the reclining angle is equal to or greater than a predetermined angle, there may be a case where an image is not projected on the screen 20. Therefore, when it is determined that the reclining angle is equal to or greater than the predetermined angle, the automatic stop device stops the projection of the image light from the projector. Thereby, it is possible to avoid the continuous output of the image light in a state where the image cannot be viewed by the system, and to save energy.

  In the first to third embodiments and the modifications, the projector is disposed so that the image light is projected rearward along the horizontal direction, but the direction in which the image light is projected is not limited to this. . For example, you may arrange | position a projector so that image light may be projected in the horizontal direction or diagonally backward, or may be projected upward.

  Furthermore, in the first to third embodiments and the modifications, the system is disposed in the automobile, but may be disposed in a train, a bus, or an airplane. Even in such a case, it is possible to make the image easy to view by increasing the display size of the image without narrowing the interior of the vehicle or the cabin and changing the display position of the image.

  Further, in the first to third embodiments and the modification, the projection image forming unit 103 includes the transmissive liquid crystal panel. However, instead of the transmissive liquid crystal panel, a reflective liquid crystal panel, DMD (Digital Micromirror Device), or CRT is used. Etc. may be provided. The DMD described above is an assembly of ultra-small mirrors having mobility. When light is applied to the DMD, an image source is formed according to the reflected light of each mirror. A projector equipped with such a DMD is configured as a DLP (registered trademark of “Texas Instruments Incorporated”) type projector.

  The video display system according to the present invention has the effect of making the video easy to see by increasing the display size of the video without reducing the indoor space and changing the display position of the video. This is useful as an RSE or the like for displaying images of movies, TV broadcasts, etc. to passengers in the rear seats in the interior space.

(A) is a block diagram which shows the arrangement configuration of the video display system in the 1st Embodiment of this invention, (b) is sectional drawing of the backrest part of a front seat same as the above. It is a circuit block diagram which shows the circuit structure of a screen angle detector same as the above. It is a block diagram which shows the structure of the light projector which performs the correction process with respect to image light same as the above, and control with respect to a mirror drive part. It is explanatory drawing for demonstrating a mode that the direction of a 1st mirror changes with rotation of a screen same as the above. It is explanatory drawing for demonstrating a mode that the direction of a 1st mirror changes by reclining a front seat same as the above. It is explanatory drawing for demonstrating the keystone correction same as the above. It is a flowchart which shows operation | movement of a projector same as the above. It is a block diagram which shows the arrangement configuration of the image | video display system at the time of installing a projector same as the above under a backseat seat. It is a block diagram which shows the arrangement configuration of the video display system in the 2nd Embodiment of this invention. It is a side view of a guide rail same as the above, a screen, and a screen holder. It is a block diagram which shows the structure of the light projector which performs the correction process with respect to image light same as the above, and control with respect to a mirror drive part. It is explanatory drawing for demonstrating a mode that the direction of a 1st mirror changes by the vertical movement of a screen same as the above. It is a flowchart which shows operation | movement of a projector same as the above. It is a block diagram which shows the arrangement configuration of the video display system in the 3rd Embodiment of this invention. It is a schematic side view of a guide rail same as the above, a screen, and a screen holder. It is a perspective view of a screen holder same as the above. It is a detailed side view of a guide rail and a screen holder same as the above. It is a block diagram which shows the structure of the light projector which performs the correction process with respect to image light same as the above, and control with respect to a mirror drive part. It is explanatory drawing for demonstrating a mode that the direction of a 1st mirror changes with the vertical movement and rotation of a screen same as the above. It is explanatory drawing for demonstrating a mode that the process part of a projector same as the above changes the angle of a 1st mirror according to correction amount. It is a flowchart which shows operation | movement of a projector same as the above. It is explanatory drawing for demonstrating the video display system of a prior art example. It is a block diagram which shows the structure of the conventional projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Front seat 1B Rear seat 10 Mirror drive part 10a 1st mirror 10b 2nd mirror 20 Screen 50 Screen holder 61 Screen angle detector 62 Reclining angle detector 100 Projector 200 Moving device

Claims (23)

An image display system for displaying an image in a space where a first seat and a second seat are installed,
A light projecting means disposed under the first seat for projecting video light for projecting video;
Reflecting means for reflecting image light projected from the light projecting means;
A screen that receives the image light reflected by the reflecting means and displays an image;
A video display system comprising: holding means attached to the first or second seat and configured to rotatably hold the screen. The video display system further includes:
2. The video display system according to claim 1, further comprising moving means for moving the screen along a backrest portion of the first or second seat. The holding means and moving means are:
The video display system according to claim 2, wherein movement along the backrest portion of the screen and the rotation are interlocked. The holding means and moving means are:
When the screen moves upward along the backrest portion, the screen is rotated so that the angle between the screen and the backrest portion increases with the movement,
4. The image according to claim 3, wherein the screen is configured such that when the screen moves downward along the backrest portion, the screen is rotated so that the angle becomes smaller as the screen moves. Display system. The video display system further includes:
At least one of an angle between the screen and a backrest portion of the first or second seat that changes according to the rotation of the screen and a position of the screen that changes according to the movement of the screen. Screen state detecting means for detecting;
According to the detection result of the screen state detection unit, at least one of the direction of reflecting the image light of the reflection unit and the position of the reflection unit so that the position of the image projected on the screen is kept constant. The video display system according to claim 2, further comprising: a video position variation suppressing unit that changes The video display system further includes:
A reclining angle detecting means for detecting a reclining angle of the first or second seat to which the screen is attached;
The video position fluctuation suppressing means is
The direction of reflecting the image light of the reflecting means according to the detection results of the screen state detecting means and the reclining angle detecting means, and the reflecting means so that the position of the image projected on the screen is kept constant. The video display system according to claim 5, wherein at least one of the positions is changed. The light projecting means is
Based on the detection results of the screen state detecting means and the reclining angle detecting means, the optical path length of the image light between the light projecting means and the screen is specified, and the focus of the image light to be projected is determined according to the optical path length. The video display system according to claim 6, wherein the video display system is adjusted. The light projecting means is
The correction processing is performed on the projected image light so that the image projected on the screen is not distorted based on detection results of the screen state detection unit and the reclining angle detection unit. 8. The video display system according to 6 or 7. The video display system further includes:
Reflecting relay means for further reflecting the image light reflected by the reflecting means and directing it to the screen according to a change in at least one of the direction of reflecting the image light of the reflecting means and the position of the reflecting means;
Based on the detection results of the screen state detection means and the reclining angle detection means, the direction and position of the reflection means are changed to change the optical path of the image light from the reflection means to the reflection relay means. 9. A switching means for switching between a first optical path toward the screen via the second optical path and a second optical path toward the screen without going through the reflection relay means from the reflection means. Video display system. The switching means is
Based on the detection results of the screen state detection means and the reclining angle detection means, a first correction amount necessary for the correction processing in the first optical path and a second correction required for the correction processing in the second optical path. Compare with the correction amount of
When the second correction amount is smaller than the first correction amount, one of the direction and the position of the reflecting means is changed so that the optical path of the image light is switched from the first optical path to the second optical path. The video display system according to claim 9, wherein: The switching means is
Based on the detection results of the screen state detection means and the reclining angle detection means, a correction amount necessary for the correction process in the first optical path is derived,
When the correction amount is larger than a predetermined threshold value, the direction and the position of the reflecting means are changed so that the optical path of the image light is switched from the first optical path to the second optical path. The video display system according to claim 9, wherein: The video display system according to claim 1, wherein the holding unit holds the screen along a horizontal direction. The holding means is
When the image light is not projected from the light projecting means, the screen is held and stored in a backrest portion of the first or second seat to which the screen is attached. Item 13. The video display system according to any one of Items 1 to 12. The video display system further includes:
The video display system according to claim 1, further comprising a light shielding unit that surrounds an optical path of the video light so as to suppress an influence of external light on the video light. The video display system further includes:
The video display system according to claim 1, further comprising a housing that includes the light projecting unit and the reflecting unit. The video display system further includes:
When the reclining angle detected by the reclining angle detecting means is compared with a predetermined threshold value and it is determined that the reclining angle is equal to or larger than the predetermined threshold value, the projection of the image light from the light projecting means is performed. The video display system according to any one of claims 6 to 11, further comprising stop means for stopping. The video display system includes:
The video display system according to any one of claims 1 to 16, wherein the first seat is a front seat and the second seat is a rear seat. . An image display method for displaying an image in a space where a first seat and a second seat are installed,
A projection step of projecting image light for projecting an image by a projector disposed under the first seat;
A reflection step in which a reflector reflects the image light projected from the projector;
A display step in which a screen attached to the first or second seat receives the image light reflected in the reflection step and displays an image;
A moving step in which a moving tool moves the screen along the first or second backrest portion;
A video display method, comprising: a rotating step in which the rotating tool rotates the screen. In the turning step,
When the screen is moved upward along the backrest portion in the moving step, the screen is rotated so that the angle between the screen and the backrest portion is increased along with the movement,
19. The video display method according to claim 18, wherein when the screen is moved downward along the backrest portion in the moving step, the screen is rotated so that the angle becomes smaller along with the movement. The video display method further includes:
At least one of an angle between the screen and a backrest portion of the first or second seat that changes according to the rotation of the screen and a position of the screen that changes according to the movement of the screen. A screen state detecting step to detect;
According to the detection result in the screen state detection step, at least one of the direction of reflecting the image light of the reflector and the position of the reflector so that the position of the image projected on the screen is kept constant. 20. The video display method according to claim 18 or 19, further comprising: a video position fluctuation suppressing step of changing one of them. The video display method further includes:
A reclining angle detection step of detecting a reclining angle of the first or second seat to which the screen is attached;
In the video position fluctuation suppressing step,
The reflection direction of the image light of the reflector and the reflection according to the detection results in the screen state detection step and the reclining angle detection step so that the position of the image projected on the screen is kept constant. The video display method according to claim 20, wherein at least one of the positions of the containers is changed. The video display method further includes:
The projector specifies an optical path length of the image light between the projector and the screen based on detection results in the screen state detection step and the reclining angle detection step, and focuses the projected image light on the optical path length. The video display method according to claim 21, further comprising: a focus adjustment step of adjusting in accordance with. The video display method further includes:
A correction process in which the projector performs a correction process on the projected image light so that the image projected on the screen is not distorted based on the detection results in the screen state detection step and the reclining angle detection step. The video display method according to claim 21, further comprising: a step.

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