JPH0876252A - Projection type display device - Google Patents

Abstract

PURPOSE: To provide a projection type display device capable of switching the picture size between a small one and a large one at need without making a device main body large. CONSTITUTION: An internal transmission type screen 2 for a small picture is attached to the front of the device main body 1 incorporating a projector unit 3 and a mirror 10 so that the screen 2 can be opened/closed. By reflecting picture light from the projector unit 3 toward the screen 2 by the mirror 10, the small picture projection having the small picture size is attained. By opening the screen 2 and arranging it out of an optical path, the picture from the projector unit 3 is enlarged and projected on a 1st or 2nd external transmission type screen 12a or 12b set on the outside of the device main body 1, thereby attaining the large picture projection having the large picture size. Therefore, the device main body 1 does not become large and the picture size can be switched between the small one and the large one at need.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device such as a projector.

[0002]

2. Description of the Related Art In a projection display device for enlarging and projecting an image such as a television image on a transmissive screen, an image formed by an image forming means such as a CRT or a liquid crystal display panel is projected on a transmissive screen by a projection optical system. By enlarging and projecting, using an image forming means with a small screen size,
There are some that allow you to obtain a large-screen image. As an example of this projection type display device, for example, an image is created by a projector unit as an image projecting means provided in the main body of the device, and this image is displayed on a transmissive screen provided on the front surface of the main body of the device by a projection optical system. It has a structure for enlarging and projecting. In this case, the projector unit includes an image forming unit such as a CRT or a liquid crystal display panel and a projection lens that projects an image formed by the image forming unit. The projection optical system includes a mirror that reflects the image light from the projector unit toward the transmissive screen.

[0003]

However, in such a projection display device, since the size of the projection screen is limited, the size of the device main body is determined according to the screen size. For this reason, when the screen size is increased, the apparatus main body becomes large, resulting in a large installation space and troublesome movement. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a projection display device capable of switching the screen size between a small screen and a large screen as necessary without increasing the size of the device body. And

[0004]

In order to achieve the above-mentioned object, the present invention is provided with an apparatus main body, an internal transmissive screen for a small screen attached to the front surface of the apparatus main body, and the apparatus main body. Image projection means, a mirror arranged inside the apparatus main body for reflecting the image light from the image projection means toward at least the internal transmissive screen, and a large image installed from outside the apparatus main body for the image from the image projection means. A projection switching means for enlarging and projecting on an external transmissive screen for a screen is provided.

[0005]

According to the present invention, the image light from the image projection means is reflected by the mirror, and the image of the reflected light is enlarged and projected on the internal transmissive screen attached to the apparatus main body. Screen projection is possible, and the projection switching means enlarges and projects the image from the image projection means from the internal transmissive screen to the external transmissive screen installed outside the main body of the apparatus, thereby enabling large screen projection with a large screen size. . Therefore, the screen size can be switched between a small screen and a large screen as needed without increasing the size of the device body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the projection type display device of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of a projection display device. The projection display device includes a device body 1. An internal transparent screen 2 for a small screen is provided on the front surface (left side surface in the figure) of the apparatus main body 1.
Is attached slidably by a rail or the like not shown. The internal transmissive screen 2 is composed of a diffusion plate, a lenticular plate, or the like, and has a screen size of about 10 inches. A projector unit (image projection means) 3 is arranged in the apparatus body 1. The projector unit 3 includes an image forming unit 4 that forms an image such as a television image, and a wide-angle projection lens 5 that magnifies and projects the image formed by the image forming unit 4. The image forming means 4 comprises a light source 6, a liquid crystal display panel 8 sandwiched by a pair of polarizing plates 7, and a Fresnel lens 9, and in the state where an image is displayed on the liquid crystal display panel 8, the liquid crystal display panel 8 is displayed. The light from the light source 6 is irradiated onto the image light, and the image light is condensed into parallel light by the Fresnel lens 9. The wide-angle projection lens 5 and the Fresnel lens 9 are integrally arranged so as to be movable along the optical axis, whereby the focus can be adjusted.

A mirror 10 for reflecting the image light projected from the projector unit 3 toward the transmissive screen 2 is provided on the projection side of the projector unit 3 in the apparatus body 1. A circuit portion 11 for driving the liquid crystal display panel 8 and the light source 6 is provided on the back surface side of the mirror 10. On the other hand, as shown in FIG. 2, the first external transmissive screen 12a or the second external transmissive screen 12b for a large screen is installed outside the front side of the apparatus body 1. First and second external transmissive screens 12a, 12b
Is a synthetic resin sheet such as polyethylene terephthalate (PET) in which a bead-based light diffusing agent is diffused, and its screen size is the internal transmissive screen 2.
It is larger than 40 inches or 60 inches. In addition, on the front surface of the apparatus body 1, an open switch (not shown) that is turned on when the internal transmissive screen 2 is opened and a close switch (not shown) that is turned on when the internal transmissive screen 2 is closed. And) are provided. This switch outputs a signal for moving the wide-angle projection lens 5 to an appropriate position for large-screen projection and an appropriate position for small-screen projection.

In such a projection display device, the image light from the projector unit 3 is reflected by the mirror 10,
The reflected light is applied to the internal transmissive screen 2 attached to the apparatus main body 1, so that the image created by the projector unit 3 is enlarged and projected on the internal transmissive screen 2. As a result, a small screen projection with a screen size of about 10 inches can be performed. When projecting a large screen of 40 inches, first, the internal transmissive screen 2
Open and place it at a position outside the optical path indicated by the chain double-dashed line in FIG. Then, an open switch (not shown) is turned on, which moves the wide-angle projection lens 5 to an appropriate position for 40-inch large screen projection. Then, the wide-angle projection lens 5 is finely adjusted by operating a remote controller or the like to adjust the focus. In this state, the image light created by the projector unit 3 is reflected by the mirror 10, and the reflected light is applied to the first external transmissive screen 12a installed outside the apparatus main body 1. The created image is enlarged and projected on the first external transmissive screen 12a.
As a result, large screen projection with a large screen size of 40 inches can be performed. At this time, if a box-shaped, bellows-shaped, or curtain-shaped light-shielding member that surrounds the optical path and blocks external light is interposed between the apparatus body 1 and the first external transmissive screen 12a, even in a bright environment. It is possible to observe the projected image satisfactorily. When projecting a 60-inch large screen, the internal transmissive screen 2 is opened, and the wide-angle projection lens 5 is moved to an appropriate position for 60-inch large-screen projection by remote control operation, as in the case of the 40-inch screen. Then, the image is enlarged and projected on the second external transmissive screen 12b. When the internal transmissive screen 2 is closed and returned to its original position, a close switch (not shown) is turned on and the wide-angle projection lens 5 returns to an appropriate position for small-screen projection.

As described above, in this projection type display device, the internal transmissive screen 2 for a small screen is openably and closably attached to the device body 1, and the first or second external transmissive screen for a large screen is provided outside the device body 1. Since the mold screens 12a and 12b are installed, the apparatus body 1 does not become large, and the screen size can be switched between a small screen of 10 inches and a large screen of 40 inches or 60 inches as needed.

Incidentally, specific dimensions of this projection type display device will be described with reference to FIG. The liquid crystal display panel 8 has a screen size of 2.4 inches and a diagonal length of 1/2.
30.5 mm, the thickness is about 1.1 mm, the Fresnel lens 9 has a thickness of 2 mm, the distance to the wide-angle projection lens 5 is 25.3 mm, the length of the wide-angle projection lens 5 is 21.5 mm, and the incident surface is Is 26
mmφ, the exit surface is 13 mmφ, the Fresnel lens 9 has a focal length of 40 mm, and the wide-angle projection lens 5 has a focal length of 55.9 mm.
The combined focal length of these is 39.8 mm. To obtain a small screen size of 10 inches with such a projection display device, the distance A from the liquid crystal display panel 8 to the Fresnel lens 9 is set to 20.3 mm, and the distance from the wide-angle projection lens 5 to the internal transmissive screen 2 is set. Set B to 159.3mm.
When obtaining a large screen size of 40 inches, the distance A from the liquid crystal display panel 8 to the Fresnel lens 9 is 13.2.
mm, and the distance B from the wide-angle projection lens 5 to the first external transmissive screen 12a may be set to 656.4 mm. In this case, the distance from the internal transmissive screen 2 to the first external transmissive screen 12a is 497.1 mm. Is. further,
To obtain a large screen size of 60 inches, the distance A from the liquid crystal display panel 8 to the Fresnel lens 9 is set to 12.4 mm, and the wide-angle projection lens 5 to the second external transmissive screen 1 are used.
The distance B to 2b may be set to 988 mm, and the distance from the inner transmissive screen 2 to the second outer transmissive screen 12b in this case is 828.7 mm.

In the first embodiment, the internal transmissive screen 2 is slidably attached to the front surface of the apparatus main body 1 by a rail or the like. However, the present invention is not limited to this. A structure in which it can be opened and closed by a hinge or the like on the front surface may be adopted. In the first embodiment, the same wide-angle projection lens 5 is used for small-screen projection and large-screen projection. However, the present invention is not limited to this, and separate projection lenses are provided to allow small-screen projection and large-screen projection. It may be exchanged at the time of projection. By doing so, the projection lens used for small-screen projection becomes compact, and the apparatus body can be downsized.

Next, referring to FIGS. 4 to 9, second to seventh embodiments of the projection type display device to which the present invention is applied will be described in order. The same parts as those in the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

The projection type display apparatus of the second embodiment shown in FIG. 4 is a mirror 10 which reflects the image light from the projector unit 3 toward the internal transmission type screen 2 for a small screen.
Is arranged so as to be movable in parallel along the optical axis of the projector unit 3. In this case, the large screen external transmissive screen 12 installed outside the apparatus main body 1 is arranged at a position higher than that in the first embodiment. The external transmissive screen 12 includes a first external transmissive screen 12a and a second external transmissive screen 12b.
Is one of. In such a projection display device, when the mirror 10 is arranged at the same position as in the first embodiment shown by the dotted line in FIG. 4, the image created by the projector unit 3 is used as the internal transmissive screen 2 for a small screen. If the mirror 10 is moved in parallel along the optical axis and is arranged at the position shown by the solid line in FIG. 4, that is, at the position where the optical path is outside the apparatus main body 1, the projector unit 3 can be used. The image light can be enlarged and projected on the external transmissive screen 12 for a large screen. Therefore,
This projection type display device also has the same effect as that of the first embodiment.

The projection type display apparatus of the third embodiment shown in FIG. 5 is a mirror 10 which reflects the image light from the projector unit 3 toward the internal transmissive screen 2 for a small screen.
Is attached to the apparatus main body 1 so as to be rotatable and movable in parallel, and also has an external transmissive screen 12 for a large screen.
Is installed on the outside of the back of the apparatus body 1. In this case, since the projection direction is rotated by 180 ° between the small screen projection and the large screen projection, the circuit unit 1
Reference numeral 1 indicates that the image displayed on the liquid crystal display device 8 is horizontally and vertically inverted. In such a projection display device, when the mirror 10 is arranged at the same position as in the first embodiment, the image created by the projector unit 3 can be enlarged and projected onto the internal transmissive screen 2 for a small screen. If the mirror 10 is rotated by a predetermined angle and then moved in parallel and arranged at the position shown by the solid line in FIG. 5, the mirror 10 allows the image light generated by the projector unit 3 to be transferred to an external transmissive screen. Since the light is reflected toward 12, the image created by the projector unit 3 can be enlarged and projected on the external transmissive screen 12.
Therefore, this projection type display device also has the same effect as that of the first embodiment.

The projection type display apparatus of the fourth embodiment shown in FIG. 6 has a mirror 10 which reflects the image light from the projector unit 3 toward the internal transmissive screen 2 for a small screen.
One end of the projector is rotatably attached by a support shaft (not shown), and a portion corresponding to the back surface of the mirror 10 of the apparatus main body 1 is opened so that the image from the projector unit 3 is directly attached to the external transmissive screen 2 for a large screen. It has a projecting structure. In this case, since the small-screen projection by reflection and the large-screen projection by direct projection are performed, the circuit section 11 horizontally flips the image displayed on the liquid crystal display device 8. In such a projection display device, when the mirror 10 is arranged at the same position as in the first embodiment, the image created by the projector unit 3 can be enlarged and projected onto the internal transmissive screen 2 for a small screen. When the apparatus body 1 is laid on its back, the mirror 10 can be rotated and placed at a position outside the optical path shown by the solid line in FIG. 6, so that an image created by the projector unit 3 can be directly transmitted to the external transmissive screen. 12 can be enlarged and projected. Therefore, this projection type display device also has the same effect as that of the first embodiment.

In the projection type display apparatus of the fifth embodiment shown in FIG. 7, the apparatus main body 1 is divided into two main body cases 1
The projector unit 3 is arranged in a, the internal transmissive screen 2 for a small screen and the mirror 10 are arranged in the other main body case 1b, and the other main body case 1b is attached to one main body case 1a such as a hinge (not shown). It has a structure that can be opened and closed. Also in this case, since the small screen projection by reflection and the large screen projection by direct projection are performed, the circuit unit 11 is configured to horizontally flip the image displayed on the liquid crystal display device 8. In such a projection type display device, if one body case 1a is closed on the other body case 1b as shown by a dotted line in FIG. 7, an image created by the projector unit 3 can be displayed on a small screen as in the first embodiment. It can be enlarged and projected on the internal transmissive screen 2 for use, and while the apparatus body 1 is laid on its back, the other body case 1b is rotated to a position outside the optical path as shown by the solid line in FIG. When opened, the image created by the projector unit 3 can be directly enlarged and projected onto the external transmissive screen 12. Therefore, this projection type display device also has the same effect as that of the first embodiment.

In the projection type display apparatus of the sixth embodiment shown in FIG. 8, the projector unit 3 is arranged in the apparatus main body 1 so that it can be erected upside down and the projector unit 3 is erected. The image light from is reflected by the mirror 10 toward the internal transmissive screen 2 for a small screen, and when the projector unit 3 is laid down, the image from the projector unit 3 is directly projected onto the external transmissive screen 12 for a large screen. It is structured to be. Also in this case, since the small screen projection by reflection and the large screen projection by direct projection are performed, the circuit unit 11 is configured to horizontally flip the image displayed on the liquid crystal display device 8. In such a projection type display device, if the projector unit 3 is erected as shown by a dotted line in FIG. 8, an image created by the projector unit 3 can be displayed in an internal transmissive screen for a small screen as in the first embodiment. 2, and if the projector unit 3 is laid sideways as shown by the solid line in FIG. 8, the image created by the projector unit 3 can be directly enlarged and projected on the external transmissive screen 12. . Therefore, this projection type display device also has the same effect as that of the first embodiment.

The projection type display apparatus of the seventh embodiment shown in FIG. 9 has a structure in which an optical path changing device 20 for changing the projection optical path is detachably attached to the tip of the projector unit 3. The optical path changing device has a structure in which mirrors 22 are arranged at the corners of a cylindrical case 21 that is bent at a substantially right angle. In this case, since the projection direction is rotated by 180 ° between the small screen projection and the large screen projection, the circuit unit 11
The image displayed on the liquid crystal display device 8 is horizontally and vertically inverted. In such a projection display device, if the optical path changing device 20 is removed from the tip of the projector unit 3, the image created by the projector unit 3 is displayed on the internal transmissive screen 2 for a small screen as in the first embodiment. If the optical path changing device 20 is attached to the tip portion of the projector unit 3 as shown in FIG. 9, the image created by the projector unit 3 can be directly enlarged and projected on the external transmissive screen 12. it can. Therefore, even with this projection display device,
The same effect as the first embodiment is obtained.

In each of the above embodiments, the screen size is 1
The switching between the small screen of 0 inch and the large screen of 40 inch or 60 inch has been described, but the present invention is not limited to this, and the screen size can be freely set. Further, in each of the above embodiments, the case where the liquid crystal display panel is used as the image forming means has been described, but the invention is not limited to this, and a CRT display may be used.

[0020]

As described above, according to the present invention, the image light from the image projection means is reflected by the mirror, and the image of the reflected light is enlarged and projected on the internal transmissive screen attached to the apparatus main body. By doing so, a small screen with a small screen size can be projected, and the image from the image projection means is enlarged and projected by the projection switching means from the internal transmissive screen to the external transmissive screen installed outside the apparatus main body. It is possible to project a large screen with a large size, so that the main body of the apparatus does not become large, and the screen size can be switched between a small screen and a large screen as needed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a projection display device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a large screen projection state in the projection display device of FIG.

FIG. 3 is a schematic diagram showing the basic configuration of FIG.

FIG. 4 is a schematic configuration diagram of a projection display apparatus according to a second embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a projection type display device according to a third embodiment of the invention.

FIG. 6 is a schematic configuration diagram of a projection type display device of a fourth embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a projection type display device of a fifth embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a projection type display device of a sixth embodiment of the present invention.

FIG. 9 is a schematic configuration diagram of a projection type display device of a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device body 2 Internal transmissive screen 3 Projector unit 10 Mirror 12 External transmissive screen 12a 1st external transmissive screen 12b 2nd external transmissive screen 20 Optical path changing device

Claims (4)

[Claims] 1. An apparatus main body, an internal transmissive screen for a small screen mounted on the front surface of the apparatus main body, an image projecting means provided in the apparatus main body, and an image projection unit provided in the apparatus main body. A mirror for reflecting the image light from the image projecting means toward at least the internal transmissive screen, and an image projected from the image projecting means is enlarged and projected on an external transmissive screen for a large screen installed outside the apparatus body. A projection display device, comprising: projection switching means for controlling the projection display device. 2. The projection display device according to claim 1, wherein the projection switching means has a structure for moving the internal transmissive screen to outside the optical path. 3. The projection type display device according to claim 1, wherein the projection switching unit has a structure for displacing the position of the mirror. 4. The projection display device according to claim 1, wherein the projection switching unit has a structure for changing an optical path of an image projected from the image projecting unit.