JPH0540318A - Projection type display device - Google Patents

Abstract

PURPOSE:To realize the projection type display device which can be switched between two kinds of projection system, i.e., a front system and a rear system. CONSTITUTION:A projector 300 is structured attachably and detachably as part of a cabinet 170, and attached to the cabinet 170 for the rear system or detached from the cabinet 170 for the front system in projection operation. Further, a transmission type screen which is used for the rear system projection is movable and when front system projection is performed, the screen is moved so that the optical path of projection light is not cut off. Further, when the transmission type screen used for the rear system projection can electrically be switched between a scatter transmission (opaque) state and a transparent state and set in the opaque state for the rear system or in the transparent state for the front system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display device,
The present invention relates to an apparatus capable of switching between two types of projection methods, front projection and rear projection.

[0002]

2. Description of the Related Art FIG. 10 shows, for example, JP-A-1-120192.
FIG. 11 is an explanatory diagram of an optical system of a front type projection display device using a conventional liquid crystal panel disclosed in Japanese Patent Publication No. JP-A-2003-242242. In the figure, 1 is a light source, 120 is a lamp, 130 is a reflecting mirror, 2 is an illumination light flux emitted from the light source 1, 14B and 14G are dichroic mirrors, 11a, 11b and 11c are mirrors, 3
R, 3G, and 3B are liquid crystal panels, 15 is a dichroic prism, 4 is a projection lens, and 5F is a reflective screen.

Next, the operation will be described. The light source 1 includes a lamp 120 and a reflecting mirror 130, and emits an illumination light flux 2. As the lamp 120, a white light source such as a metal halide lamp, a xenon lamp, or a halogen lamp is used. Further, the reflecting surface of the reflecting mirror 130 is typically a parabolic surface, and the lamp 12 is located at the focal point of the parabolic surface as is well known.
By arranging the emission center of 0, the parallel illumination light flux 2 is obtained. The illumination luminous flux 2 is decomposed into three primary colors of red, green, and blue by a dichroic mirror 14B that reflects blue light and transmits green / red light and a dichroic mirror 14G that reflects green light and transmits red light. 11
The liquid crystal panels 3R, 3G, and 3B that are bent by b and 11c and display a monochrome image corresponding to each primary color are irradiated. A drive circuit for displaying an image on the liquid crystal panels 3R, 3G, 3B is not shown.

The image-modulated light beam formed on the liquid crystal panel is recombined into one light beam by the dichroic prism 15 that selectively reflects red and blue light and selectively transmits green light, and then projects the light beam. The projection light 110 by the lens 4
And is enlarged and image-formed on the reflection type screen 5F. The projection lens 4 needs to suppress various aberrations in order to obtain a good projection image, and is configured by combining a plurality of single lenses as is known, but the single lens is not shown for simplicity. Focusing of the projected image on the screen is performed by driving a part of the single lens constituting the projection lens 4 or the entire projection lens 4 in the optical axis direction. Reference numeral 200 denotes an enclosure that holds the projection lens 4 and the optical system before the projection lens 4, and the enclosure 200 and the projection lens 4 constitute a projector 300. In the front-type projection display device, the viewer 400 views the display image on the screen from the direction in which the projector 300 is arranged with respect to the reflective screen 5F.

Although the above description has been made on the front type device, a so-called rear type projection type display device in which the entire optical system is housed in a cabinet has also been known. Next, as a second conventional example, for example, actual Kaihei 1-11
FIG. 11 shows the configuration of the rear-type projection display device disclosed in 5778. In the figure, reference numeral 300 is a projector including the casing 200 and the projection lens 4, 150 and 160 are folding mirrors, 5R is a transmissive screen, and 170 is a cabinet.

Next, the operation of the apparatus shown in FIG. 8 will be described. The projector 300 has the same configuration as the projector 300 shown in FIG. 10, and an optical system from the light source 1 to the dichroic prism 15 is held inside the housing 200, but illustration is omitted for simplicity. is doing. The projection light 110 emitted from the projection lens 4 is bent by the bending mirrors 150 and 1
After being reflected by 60, it is formed as an enlarged image on the transmissive screen 5R. The folding mirrors 150, 16
0 bends the optical path from the tip of the projection lens 4 to the transmissive screen 5R so that the cabinet 17 is relatively small.
It is used for compact storage in 0. Then, the observer 400, with respect to the transmissive screen 5R,
The magnified image is viewed from the direction opposite to that of the projector 300.

[0007]

As described above, FIG. 10 and FIG.
1 describes the conventional front and rear projection display devices. Since the front type projection display device does not have a cabinet size restriction, the projection distance (the distance from the exit end of the projection lens 4 to the reflective screen 5F in FIG. 10) can be made large. Therefore, the front method is suitable for large-screen display in which the projection magnification (the magnification for enlarging and projecting the original image of the liquid crystal panel on the screen) is larger than that of the rear method. However, this method has the following problems.

(1) A person cannot freely enter and leave the space between the projector 300 and the reflection type screen 5F (within the range of the projection light 110) while the image is displayed. In addition, the projector 300
If the projector is permanently installed in the room, the projector 300 and the screen 5F
If furniture or the like is placed between the two, it interferes with the projection light path, so that it is inconvenient to move the projection light 110 out of the range when displaying an image.

(2) The screen 5F is generally made of a material having a high reflectance so as to obtain a high-luminance image. For this reason, if the illumination (not shown) in the room is brightened while the image is being viewed, the portion that should be displayed dark in the image becomes bright and the contrast deteriorates. In order to get a good image with the front system, you can only watch in a dark environment without indoor lighting, such as in a movie theater, and it is inconvenient to see a large screen image while doing other work (for example, writing notes or doing housework). is there.

(3) If the reflection type screen 5F is installed on the wall, the projector 300 may have to be installed near the center of the room, which is an obstacle in considering the free layout of the room.

The rear method is advantageous for the above problems. Because, for (1) above, the rear type optical system is all housed in the cabinet 170.
The projection light 110 is not blocked by people or furniture. For (2) above, the transmissive screen 5 has been used conventionally.
A black stripe is provided on the surface of R or the projection light 11
An apparatus has been developed in which the contrast deterioration is small even under normal room illumination by a method of forming the transmissive screen 5R with a material that selectively transmits only the spectrum component of 0. Also in the above (3), the relatively small cabinet 170 is installed in the wall or the corner of the room so that the layout of the central part of the room is not hindered.

In order to obtain a large screen with a rear system device,
It is necessary to increase the projection distance or increase the angle of view of the projection lens 4. However, the former generally has a problem that the cabinet 170 becomes large (especially the depth) and the installation space becomes large, and the latter has a problem that the number of lens components is increased and the height is increased in order to cope with the wide angle of the projection lens. There was a problem of becoming a price. On the other hand, since the front system does not use a cabinet, it is advantageous for increasing the screen size. In consideration of the characteristics of both types as described above, for example, in the case of a home video projector, the rear type is a device that mainly displays a 40-70 inch diagonal image, and the front type is a 60-200 inch pair. The mainstream devices were devices that display large-screen corner images.

As described above, the front system has many restrictions in installation, but is particularly suitable for viewing a large screen image. Although the rear method has a smaller image than the front method, it is suitable for viewing a medium-sized large-screen image in a normal lighting environment. Conventionally, in consideration of the characteristics of both of these methods, the user has used an apparatus of a more suitable method.
However, if both types are used properly in a general home depending on the usage situation, there is a problem in terms of installation space and the cost of purchasing two devices, and there is no choice but to view the images with one of the devices. There were many An object of the present invention is to realize a projection type display device capable of switching between a rear system and a front system with a single device, and enables a user to easily select and use the characteristics of both systems. It is a thing.

[0014]

In the projection display device according to the present invention, the rear system and the front system can be switched by any of the following means.

(1) The projector has a structure that can be attached to and detached from a part of the cabinet. In the case of the rear system, the projector is attached and projected, and in the case of the front system, the projector is detached from the cabinet and projected.

(2) The transmissive screen used for rear system projection is movable, and when projecting by the front system, it moves to a position where it does not block the optical path of the projection light.

(3) The transmissive screen used for rear system projection can be electrically switched between a scattered transmissive (opaque) state and a transparent state. In the rear system, it is set to opaque, and in the front system, If it is set to transparent.

(4) The bending mirror arranged immediately after the projector is held by a mount that can move in parallel,
In the case of the rear method, the projection light is bent inside the cabinet to form an image on the transmission screen, and in the case of the front method, the projection light is bent outside the cabinet to form an image on the reflection screen.

In addition to the means (1) to (4) above, in order to cope with the inversion of the left and right of the projected image by switching the optical paths of the rear system and the front system,
Inversion means for the left-right scanning direction of the image display device is provided.

[0020]

In the apparatus of the present invention, it is possible to select whether the optical path of the projection light is guided outside the cabinet or confined inside the cabinet by means of any of the above (1) to (4). Can be switched. Also, due to the reversing function of the scanning direction of the image display device,
The right and left sides of the image can be viewed in the correct state according to the switching between the front method and the rear method.

[0021]

【Example】

Example 1. First Embodiment FIG. 1 is a configuration diagram of a projection display device according to a first embodiment of the present invention. In the figure, reference numeral 300 is a projector constituted by the casing 200 and the projection lens 4, reference numerals 150 and 160 are folding mirrors, 5R is a transmissive screen, 170 is a cabinet, and 600 is a switch for instructing image scan reversal. Further, 171 is a projector holding portion provided in a part of the cabinet 170, and is configured so that the projector 300 can be attached to or removed from the cabinet 170.

First, the operation of the first embodiment will be described.
FIG. 1 shows an optical path when the projection display device of the present invention is used in a rear system. The internal configuration of the projector 300 is the first
Since it is the same as FIG. 10 showing the conventional example, the illustration and description are omitted. The projection light 110 emitted from the projection lens 4 is
Bending mirror 1 as in the case of FIG.
It is folded in the cabinet 170 by 50 and 160 and projected on the transmissive screen 5R to form a magnified image for viewing. In the case of rear system projection, the projector 300 is mounted and held in the cabinet 170 by the projector holder 171 as described above.

Next, the operation when the apparatus of the present invention is used in the front system will be described. As mentioned above, the projector 3
00 is a cabinet 170 by the projector holder 171.
Since it can be detached from the cabinet 170 and installed so that the projection light 110 is directly incident on the reflection type screen 5F as shown in FIG. 2, it becomes a front type projection type display device. Here, 600 is a switch for reversing the scanning direction of the image display device. The state of the switch knob 601 is changed between a state in which the projector 300 is held in the cabinet 170 (FIG. 1) and a state in which the projector 300 is detached from the cabinet 170 (FIG. 2).

If the images displayed on the image display device are the same in the rear projection (FIG. 1) and the front projection (FIG. 2), the position where the image is viewed is closer to the projector than the screen (front projection). , It is on the opposite side of the screen from the projector (rear system), which is inconvenient because the left and right of the image are reversed. Therefore, the switch 600
It is detected whether the lever 601 is pressed (FIG. 1) or not (FIG. 2), and the projector 300 not particularly shown
By instructing the scanning direction control circuit of the image display device in the left / right inversion / non-inversion of the image, the left / right of the image is correctly displayed regardless of the projection method. Since the method of reversing the scanning direction of the image display device is known, its description is omitted.

From the front system state shown in FIG.
When switching to the rear system state shown in FIG. 1, the projector 300 may simply be installed at a predetermined position of the cabinet 170 as shown in FIG. At this time, switch 6 automatically
The lever 601 of 00 is pushed in to bring the image into the scanning state for the rear system.

As a modified example, the entire projector 300 is moved up and down (vertical direction in FIG. 1) so that the projection light 110 is reflected by the mirror 150 (rear system projection), and the projection light is outside the cabinet 170. It is also possible to switch between a state in which the light is emitted and made incident on the reflection type screen 5F (front system projection). Projector 300 for front system projection
Since it can be installed independently of the cabinet, the installation locations of the reflective screen 5F and the projector 300 can be freely selected.

Example 2. 3 and 4 are configuration diagrams of a projection display apparatus according to a second embodiment of the present invention. FIG. 3 is a configuration diagram of rear system projection, and FIG. 4 is a configuration diagram of front system projection. In this embodiment, the projector 300 is arranged inside the cabinet 170, and only one folding mirror, 150, is provided for convenience of explanation. There is no problem even if two folding mirrors are used as in the first embodiment. In the figure, 5R is a transmissive screen and 612 is a screen 5R.
Fixing members 610 and 611 are slide fixing members of the screen 5R, and a space between the slide fixing members 610 and 611 having a distance of about the thickness of the screen 5R.
00 is a switch, and 631 is a signal line for transmitting a command from the switch 600 to the inside of the projector 300. .. Other components are the same as those in FIG. 1 showing the first embodiment.

Next, the operation of the rear system projection according to the second embodiment will be described with reference to FIG. The projection light emitted from the projector 300 is reflected by the bending mirror 150 and is enlarged and focused on the transmissive screen 5R for viewing. At this time, the screen 5R includes the fixing member 612 provided on the front surface of the cabinet 170 and the slide fixing members 610 and 611.
Is held in the optical path of the projection light 110.

Next, the operation of the front system projection according to the second embodiment will be described with reference to FIG. In this case, the transmissive screen 5R is moved and stored between the slide members 610 and 611. As a result, the projection light 110 is emitted from the opening 613 to the outside of the cabinet 170, and is enlarged and focused on the reflective screen 5F for viewing. It should be noted that the scanning direction control circuit (not shown) in the projector 300 is activated through the signal line 631 in response to a command from the switch 600 in each case of rear projection (FIG. 3) and front projection (FIG. 4). , The left-right scanning direction of the image display device is reversed so that the projected image is formed correctly.

In this embodiment, the screen is moved up and down, but it may be moved left and right (perpendicular to the plane of the drawing) and stored. Further, the transmissive screen 5R may be attached to and detached from the cabinet 170, or may be folded and removed from the optical path of the projection light 110. As described above, according to the second embodiment, since the front and rear projection systems can be switched by an extremely simple means, the device can be manufactured at almost the same cost as the conventional rear system projection display device.

Example 3. 5 and 6 are configuration diagrams of a projection display apparatus according to a third embodiment of the present invention. FIG. 5 is a configuration diagram of rear system projection, and FIG. 6 is a configuration diagram of front system projection. In this embodiment, the transmissive screen 5R is transparent (in a state like a transparent window glass) according to an applied voltage,
A known scattering mode liquid crystal panel that can switch the opaque state (frosted glass-like scattering transmission state) is used. In the figure, reference numeral 630 is an AC power source, and electric wires 632, 6
A voltage is applied to the scattering mode liquid crystal panel through 33 to switch the transparent / opaque state.

First, the operation of the rear projection in the third embodiment will be described. The output voltage of the power supply 630 is set to 0 V by a command from the switch 600, and the projector 3
A scanning direction control circuit (not shown) in 00 is set so as to provide left and right scanning directions suitable for rear projection.
When no voltage is applied (0 V), the screen 5R becomes opaque (scattering / transmitting state), and the projection light 110 receives the screen 5R.
When the light enters R, the display image of the image display device is enlarged and imaged for viewing.

Next, the operation of switching to the front system projection will be described. The AC output voltage of the power supply 630 is set to a predetermined value according to the operation of the switch 600, and a scanning direction control circuit (not shown) inside the projector 300 is also provided.
Is set so as to provide the left and right scanning directions suitable for front projection. When an alternating voltage of a certain level or more is applied to the scattering mode liquid crystal panel, the screen 5R becomes transparent as shown in FIG. As a result, the projection light 110 is transmitted without being scattered by the screen 5R, and the reflection type screen 5
A magnified image of the image display device is formed on F, and front type projection display is performed.

Next, the structure and operation of the scattering mode liquid crystal panel used as the transmissive screen in the third embodiment will be described with reference to FIG. In the figure, reference numerals 641 and 642 denote transparent substrates, and the transparent conductive film 64 is provided on the inner surface facing each other.
3,644 are formed. 645 is a transparent polymer 6
It is a liquid crystal dispersed in a spherical capsule shape in 46, and typically has a diameter of about several μm or less. Polymer 6
46 and the liquid crystal 645 are enclosed between the transparent substrates 641 and 642, and the layer thickness is usually about 5 to 30 μm. Figure 7
In (a), no voltage is applied, and since the liquid crystal 645 is irregularly arranged, the incident light 647 is scattered and transmitted light 64.
It becomes 8. Therefore, the liquid crystal panel is opaque (scattered and transmitted)
It becomes a state.

On the other hand, when a voltage is applied to the liquid crystal panel by the AC power source 630, an electric field is generated in the liquid crystal layer to align the liquid crystal molecules, and the incident light 647 is transmitted (transparent) without changing its traveling direction. .. In the figure, 649 indicates transmitted light. In general, the transparency of the panel is improved according to the voltage applied to the liquid crystal panel. Therefore, when it is desired to transmit the projection light as shown in FIG. 6, a voltage of a predetermined value or more is applied and used.
It is known that the response speed of the scattering mode liquid crystal (transition / transmission state switching time) is 1 second or less, which makes it possible to switch the projection method very quickly. Moreover, since there is no mechanically movable part, it is a feature of the third embodiment that troubles due to switching can be reduced.

For details of the scattering mode liquid crystal having the above-mentioned structure, see, for example, (JW Doane, et al .; Applied Physic
s Letters, Vol.48, No.4 (1981), PP.269-271).

Example 4. 8 and 9 are configuration diagrams of a projection display apparatus according to a fourth embodiment of the present invention. FIG. 8 is a configuration diagram of rear system projection, and FIG. 9 is a configuration diagram of front system projection. In FIG. 8, 150 is a folding mirror, 6
20 is a mount for holding a folding mirror, 621, 6
22 is a slide portion provided on the side surface of the mount 620,
Reference numeral 170 is a cabinet, and 171 and 172 are guide portions provided in a part of the cabinet 170. In the case of rear projection, the folding mirror 150 is housed inside the cabinet 170 as shown in FIG. Projection light 110
Is reflected by the bending mirror 150, and an enlarged image is formed on the transmissive screen 5R for viewing. On this occasion,
In response to a command from the switch 600, a scanning direction control circuit (not shown) in the projector 300 is set via the signal line 631 so as to give the image display device a left and right scanning direction suitable for rear projection.

On the other hand, in the case of front projection, the mount 6
The slide parts 622 and 621 of 20 slide upward along the guide parts 171 and 172 provided in a part of the cabinet, and the folding mirror 150 is installed in the cabinet 17.
Held outside 0. As a result, the projection light 110 is reflected by the mirror 150 outside the cabinet 170, and a magnified image is formed on the reflective screen 5F.
At this time, the command from the switch 600 is transmitted to the scanning direction control circuit (not shown) in the projector 300 through the signal line 631 so that the image display device is in the left and right scanning state suitable for the front system projection. Is set.

In the above embodiments, for simplification, the example of the structure in which one folding mirror is used (FIGS. 8 and 9) has been described. There is no problem even if there are two or more bending mirrors, but in this case, it is desirable to switch the projection method by switching the projection method by moving the mirror disposed immediately after the projector 300 in parallel. This is because the cross-sectional area of the projected light increases as the distance from the projector increases, so the size of the mirror also increases, and if you move the mirror other than immediately after the projector to switch the projection method, the mounting mechanism and slide mechanism will become large. This is because the cost of the device becomes high. As described above, according to the third embodiment, switching of the projection method can be realized with a relatively simple mechanism.

In each of the above embodiments, the example of the projection lens 4 constituting the projector 300 is one (one lens system). That is, as described with reference to FIG. 10, the projection lights of the three primary colors are combined when they enter the projection lens. Therefore, in the one-lens method, after the projection lens, the images are projected on the screen through a common optical path, and even if the projection distance is changed, the images of the three primary colors are not displaced from each other.
On the other hand, a method (three-lens method) in which a separate projection lens is provided for each primary color and projection light is combined on the screen is also known.

However, it is known that in the three-lens system, since the optical paths of the three primary colors after the projection lens are different, the images of the three primary colors shift when the projection distance changes. For this reason, complicated convergence adjustment (adjustment for superimposing the images of the three primary colors on each other) is required. This adjustment is especially necessary in the case of the front method in which the projection distance changes. Considering that the projection display device of the present invention is switched to the front system projection, it is advantageous to use the one-lens system projector 300 because a mechanism for convergence adjustment is not necessary. However, if a known convergence adjustment mechanism is provided, the present invention can be applied even if a three-lens type projector is used.

The liquid crystal panel inside the projector 300 has three
Although the description has been made on the premise of the number of sheets (FIG. 10), a method of projecting a monochrome or color image of one liquid crystal panel, and a method of combining and projecting two or four or more display images are also known. Of course, the present invention can be applied regardless of the number of liquid crystal panels.

Although only the case where the liquid crystal is used as the device for displaying the original image has been described, a projector for enlarging and projecting the display image of the CRT is also known, and the present invention uses such a projector. However, it can be applied without any problems.

[0044]

As described above, according to the present invention, the projection optical paths of the rear system and the front system can be easily switched by one device, so that the user can selectively use both systems depending on the situation. Specifically, particularly when viewing a large-screen image, projection can be performed by the front method, and when viewing a medium-sized large-screen image with indoor lighting, projection can be performed by the rear method. Further, since the projectors are commonly used as compared with the conventional front-type and rear-type devices which are installed one by one, the installation space is small and the cost required for introducing the device can be reduced.

In addition to the common effects described above, each of the first to fourth inventions has the following individual effects.

(1) Since the entire projector can be removed from the cabinet, the projector can be freely installed separately from the cabinet in the case of front projection, and the installation location of the reflection type screen and the projector can be selected more freely.

(2) A state in which the transmissive screen is placed in the projection light by moving or detaching the transmissive screen,
Since the projection system can be switched by selecting the state in which the transmissive screen is removed from the transmitted light, the device can be manufactured at almost the same cost as the conventional rear system projection display device.

(3) Since the projection system can be changed simply by electrically switching between transparent and opaque screens, it is possible to switch quickly within 1 second. Moreover, it has high reliability because it has no mechanically movable parts.

(4) Since the projection system can be switched simply by moving the mirror in parallel and moving it in and out of the cabinet, the object can be achieved with a simple mechanism. In addition, since the bending mirror immediately after the projector is moved, the mechanism and mount for driving the mirror are different from those for moving the second and subsequent bending mirrors (for example, the mirror 160 in FIG. 11 showing the second conventional example). It is small and the required cost is low.

[Brief description of drawings]

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

FIG. 2 is an operation explanatory diagram when using FIG. 1 in a front system.

FIG. 3 is a configuration diagram showing a projection type display device according to a second embodiment of the present invention.

FIG. 4 is an operation explanatory diagram when FIG. 3 is used in a front system.

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

FIG. 6 is an operation explanatory diagram when using FIG. 5 in a front system.

FIG. 7 is an explanatory diagram of the structure and operation of the scattering mode liquid crystal panel used as the transmission screen in FIG.

FIG. 8 is a configuration diagram showing a projection type display device according to a fourth embodiment of the present invention.

FIG. 9 is an operation explanatory diagram when FIG. 8 is used in a front system.

FIG. 10 is a configuration diagram of a first conventional projection display device (front system).

FIG. 11 is a configuration diagram of a second conventional projection display device (rear system).

[Explanation of symbols]

 3R, 3G, 3B image display device 300 projector 4 projection lens 150, 160 mirror means 5R transmissive screen 170 cabinet means 171 projector holder 5F reflective screen 610, 611 slide fixing means 630 power supply means 620 mounting means 600 switch means

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[Procedure amendment]

[Submission date] August 19, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Example 2. 3 and 4 are configuration diagrams of a projection display apparatus according to a second embodiment of the present invention. FIG. 3 is a configuration diagram of rear system projection, and FIG. 4 is a configuration diagram of front system projection. In this embodiment, the projector 300 is arranged inside the cabinet 170, and only one folding mirror, 150, is provided for convenience of explanation. There is no problem even if two folding mirrors are used as in the first embodiment. In the figure, 5R is a transmissive screen and 612 is a screen 5R.
Fixing members 610 and 611 are slide fixing members of the screen 5R, and the space between the slide fixing members 610 and 611 is about the thickness of the screen 5R.
ing. Further, 600 switch, 631 is a signal line for transmitting a command by the switch 600 in the interior of the projection 300. Other components of that are the same as in FIG. 1 showing the first embodiment.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

Next, the operation of the front system projection according to the second embodiment will be described with reference to FIG. In this case, the transmissive screen 5R is moved and stored between the slide fixing members 610 and 611. As a result, the projection light 110 is transmitted through the opening 613.
Then, the light is emitted to the outside of the cabinet 170 and is enlarged and focused on the reflection type screen 5F for viewing. In addition, depending on each case of rear projection (FIG. 3) and front projection (FIG. 4),
In response to a command from the switch 600, a scanning direction control circuit (not shown) inside the projector 300 is activated through the signal line 631, and the horizontal scanning direction of the image display device is reversed to form a correct projected image.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

Example 4. 8 and 9 are configuration diagrams of a projection display apparatus according to a fourth embodiment of the present invention. FIG. 8 is a configuration diagram of rear system projection, and FIG. 9 is a configuration diagram of front system projection. In FIG. 8, 150 is a folding mirror, 6
20 is a mount for holding a folding mirror, 621, 6
22 is a slide portion provided on the side surface of the mount 620,
170 cabinet, 17 3, 172 is a guide portion provided on a part of the cabinet 170. In the case of rear projection, the folding mirror 150 is housed inside the cabinet 170 as shown in FIG. Projection light 110
Is reflected by the bending mirror 150, and an enlarged image is formed on the transmissive screen 5R for viewing. On this occasion,
In response to a command from the switch 600, a scanning direction control circuit (not shown) in the projector 300 is set via the signal line 631 so as to give the image display device a left and right scanning direction suitable for rear projection.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

On the other hand, in the case of front projection, as shown in FIG.
Ku, sliding portions 622,621 of the mount 620 is slid upward along the guide portion 17 3, 172 provided in a part of the cabinet, the folding mirror 150 is held outside of the cabinet 170. As a result, the projection light 110 is reflected by the mirror 150 outside the cabinet 170.
The reflected image is reflected by, and an enlarged image is formed on the reflective screen 5F. At this time, the command from the switch 600 is transmitted to the scanning direction control circuit (not shown) in the projector 300 through the signal line 631 so that the image display device is in the left and right scanning state suitable for the front system projection. Is set.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction content]

[0046] (1) the entire projection unit is Dekiru removed from the cabinet, projectors in the case of a front projection can be separately installed freely from the cabinet, reflective screen, the location of the projectors to choose freely.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of Codes] 3R, 3G, 3B Image Display Device 300 Projector 4 Projection Lens 150, 160 Mirror Means 5R Transmissive Screen 170 Cabinet Means 171 Projector Holding Means 5F Reflective Screen 610, 611 Slide Fixing Means 630 Power Supply Means 620 Mount means 621, 622 Mount slide means 600 Switch means

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location H04N 9/31 C 9187-5C

Claims (4)

[Claims] 1. A projector having a built-in image display device, for enlarging and projecting an image displayed on the image display device, a projection lens provided at an emitting portion of the projector, and a projection for emitting from the projection lens. Mirror means for bending and guiding the optical path of light, a transmissive screen on which projection light guided by the mirror means is incident to form an enlarged image, and the mirror means are built-in and hold the transmissive screen. In a projection display device having a cabinet means and a reflective screen arranged outside the cabinet means, the projection display device is formed in a part of the cabinet means,
Projector holding means for detachably holding the projector is provided, and when projecting in a rear system, the projector is held in the cabinet means by the projector holding means,
When the image displayed on the image display device is magnified and projected on the transmissive screen by guiding the projection light by being reflected by the mirror means, when projecting by the front system,
A projection type display characterized in that the projector is detached from the projector holding means and the projection light is guided to the reflection type screen to enlarge and project the image displayed on the image display device on the reflection type screen. apparatus. 2. A projector having a built-in image display device, which magnifies and projects an image displayed on the image display device, a projection lens provided at an exit portion of the projector, and a projection which is emitted from the projection lens. Mirror means for bending and guiding the optical path of light, a transmissive screen on which projection light guided by the mirror means is incident to form an enlarged image, and the mirror means are built-in and hold the transmissive screen. In a projection type display device having a cabinet means and a reflection type screen arranged outside the cabinet means, a state in which the transmission type screen is positioned in the optical path of the projection light and a position outside the optical path of the projection light. A projection type display device comprising a screen moving means capable of switching between the states where the display is turned on. 3. A projector having a built-in image display device, for enlarging and projecting an image displayed on the image display device, a projection lens provided at an emitting portion of the projector, and projection for emitting from the projection lens. A mirror means for bending and guiding the optical path of light; a transmissive screen for forming a magnified image upon incidence of projection light guided by the mirror means; a power supply means for applying a voltage to the screen; and the mirror means. In a projection display device having built-in and cabinet means for holding the transmissive screen, the transmissive screen comprises a scattering mode liquid crystal panel, and the voltage applied to the liquid crystal panel by the power supply means is switched to change the voltage. The screen can be switched between a transparent state and an opaque state, and a reflective screen is provided outside the cabinet means. A lean is arranged to form a magnified image of the image display device on the transmissive screen when the transmissive screen is opaque, and the projection light transmitted through the transmissive screen when the transmissive screen is transparent is used. A projection display device, characterized in that it is made incident on the reflection type screen to form a magnified image of the image display device. 4. A projector having a built-in image display device, for enlarging and projecting an image displayed on the image display device, a projection lens provided in an emitting portion of the projector, and projection for emitting from the projection lens. Built-in mirror means for bending and guiding the optical path of light, mount means for holding the mirror means, transmissive screen for forming a magnified image upon incidence of projection light guided by the mirror means, and the mirror means And a projection display device having cabinet means for holding the transmissive screen, and a reflective screen arranged outside the cabinet means,
A mount moving unit disposed adjacent to the mount unit and the cabinet unit and capable of switching between a state where the mirror unit is located inside the cabinet unit and a state where the mirror unit is located outside the cabinet unit;
In a state in which the mirror means is located in the cabinet due to the setting of the mount moving means, the light flux reflected by the mirror means is made incident on the transmissive screen, and the image display device is enlarged on the transmissive screen. In a state where an image is formed and the mirror means is located outside the cabinet due to the setting of the mount moving means, the light flux reflected by the mirror means is made incident on the reflection type screen, and the light is reflected on the reflection type screen. A projection display device, which forms an enlarged image of an image display device.