JP2000199927A - Rear projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a rear projection type display device, with which a user can easily select a projection system and the size of a picture by making equipment thin, when the equipment is not used, respectively unitizing a projecting machine, a reflecting mirror, and a transmission screen, so that the performance of usage,, exchange, and maintenance as a unit is enhanced, and making projecting lens exchangeable. SOLUTION: A housing is constituted by engaging plural panels mirror panel 18, side panel 19, floor panel, back panel 21). A projecting machine is taken out from the housing, the respective panels are opened/closed as a door while making respective hinges shafts, so that the housing can be readily folded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear projection display device for displaying an image on a transmission screen.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view of an example of a conventional rear projection type display device as viewed from the side. As shown in FIG.
In this rear projection display device, a projector 5 that forms and projects an image, a mirror a15 and a mirror b16 that reflect light emitted from a projection optical system, and the light reflected by each mirror is projected. The transmission screen 8 is configured by being housed in the housing 10.

FIG. 7 shows an example of a projector 5 according to the rear projection type display device shown in FIG. The light output from the light source 11 is separated into each color of red (R), green (G), and blue (B) by the dichroic mirror 6 and then reflected by the mirror c7 to be incident on the three liquid crystal light valves 1. I do. The liquid crystal light valve 1 displays information corresponding to an image signal for each of R, G, and B colors. Liquid crystal light valve 1
The light of each color modulated by the light is synthesized by the cross dichroic prism 3 having a dichroic film formed in an X shape along the bonding surface of the four triangular prisms, and is enlarged and projected by the projection lens 4.

The projection light 2 from the projection lens 4 is transmitted to a mirror a
15 and the mirror b16 to form an image on the transmission screen 8. Thereby, the observer 9 can form an image on the transmission screen 8 and view the image with the light emitted from the screen 8. In FIG. 6, the optical axis of the projection light 2 is indicated by a dashed line, and the width p of the light beam is indicated by a dotted line. The housing 10 is a structure for holding each of the above-described parts, and has a dark room structure inside, thereby preventing external light from being incident on the rear surface of the transmission screen 8 to prevent a decrease in contrast.

[0005] Here, the housing 10 is a box-shaped structure.
The outer dimensions of the housing 10 are roughly determined by the diagonal size of the screen. For example, when the diagonal size of the screen is 60 inches, the width is about 1200 mm or more, and the depth dimension is about 1 mm.
About 000 mm. Thus, the outer dimensions of the housing 10 and the diagonal size of the screen are in a proportional relationship.

However, many rear projection display devices generally have a large screen of 40 inches or more, and are often used for watching large-screen images such as watching a movie. Such a display device is being applied as a display device dedicated to watching a movie in a home, such as a home theater, and a T device that is frequently used on a daily basis.
It is desired that the atmosphere of a movie theater can be easily enjoyed at home by using it only at the time of watching separately from V and the like.

Therefore, in many rear projection display devices,
Although there is a trend toward larger screens, it is also an important issue to reduce the depth dimension. Many of the reasons are for measures such as storage space when not in use, and improvement due to increase in transportation cost.

In the conventional rear projection type display device, in response to the contradictory demands for reducing the depth of the housing 10 and obtaining a large screen, the screen size is reduced by the minimum necessary. With the trade-off.

[0009]

In the above prior art,
In order to make the depth dimension of the casing 10 thinner, the optical axis of the projection light 2 is bent to increase the projection distance, or the projector 5 is installed at an angle. Does not change significantly. Further, simply bending the optical axis only increases the size of the housing 10 in the height direction, and does not lead to substantial miniaturization of the housing 10. Further, if the projector 5 is installed at an angle, the displayed image will be distorted, and the alignment with the transmissive screen 8 will be complicated.

As described above, in the prior art, the housing 10 remains large, and the size cannot be generally changed even when not in use or during transportation.

The present invention has been made in order to solve such a problem, and an object of the present invention is to firstly improve the storability of the housing 10 when not in use. Third, the present invention proposes a new rear projection type display device called an assembling type.

[0012]

According to the present invention, there is provided a rear projection type display apparatus comprising: an image forming means for forming an image; and a projection optical system for projecting light emitted from the image forming means. A rear projection display device having, in a housing, a projector, a reflection unit that reflects projection light emitted from the projector, and a transmission screen on which the projection light reflected by the reflection unit is projected, The housing is configured to be foldable.

According to the above configuration of the present invention, the housing can be thinned by folding the housing, and the storage capacity when not in use is improved, for example, the storage space does not take up much space. . Further, at the time of transportation of the product, it is possible to prevent an increase in transportation cost due to the size of the product and damage during handling.

Further, in the rear projection display device of the present invention, the housing is an engaging body of a plurality of panels, and the respective panels are rotatably (swingably) connected by engaging means (also called joint means). Is done. According to such a configuration, it is possible to maintain high strength because of the panel structure despite the assembly structure. Further, since each panel is engaged by a joint means such as a hinge, it is possible to prevent the panels from being lost. In addition, since it is not necessary to engage each panel individually, it is possible to assemble easily by one person.

Further, in the rear projection display device of the present invention, the panel can be folded by rotating or moving so as to approach the transmissive screen. With a structure in which the panel is opened and closed like a door, it can be used as a cover for storage.

Further, in the rear projection type display apparatus of the present invention, the frame and each panel can be made independent by employing a structure in which the transmission screen is fixed to the frame and the panel is connected to the frame. A box-shaped structure can be formed.

Furthermore, in the rear projection type display device of the present invention, when the panel is folded, it also serves as a protective means for the transmissive screen, so that a new protective member is not required, and the transmissive screen during transport or storage is not required. Protection of the mold screen is possible.

Further, in the rear projection type display device of the present invention, the projector, the reflection means, and the transmission type screen form separate units, and each unit is detachable. With such a configuration, disassembly at the time of storage can be easily performed, and it is easy to assemble with good reproducibility at the time of use. Furthermore, it is excellent in maintainability such as replacing each element with one having different performance and repair. Also, the projector can be taken out of the housing and used alone.

Further, in the rear projection type display device of the present invention, the portability at the time of storage and transportation is improved by forming the reflection means by a film mirror. In addition, during assembly during use, cracking and breakage can be prevented, and portability and handling are facilitated.

Further, in the rear projection type display apparatus of the present invention, the projection optical system is held so as to be exchangeable with respect to the projector. As a result, the projection optical system having a different magnification can be exchanged, and the screen size can be freely selected to be large or small. In addition, when the projector is used alone, it can be used as a front projection display by exchanging the projection optical system, and the user can freely select it.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side sectional view of a device representing a rear projection type display device according to a first embodiment of the present invention, and FIG. 2 is a projection incorporated in the rear projection type display device. FIG. FIG. 3 is an external view of the rear projection display device as viewed from the rear.

The rear projection type display apparatus according to this embodiment is a transmission screen on which the projector 5, mirrors a15 and b16 as reflection means, and the projection light 2 projected from the projector 5 are formed. 8 and a housing 10 for accommodating them.

The projector 5 is, for example, as shown in FIG.
A light source 11 for irradiating the liquid crystal light valve 1 with light from behind, and two dichroic mirrors for dispersing the light output from the light source 11 into red (R), green (G), and blue (B) colors 6, a mirror c7 for reflecting the split light, and three liquid crystal light valves as image forming means for modulating each color light to form an image corresponding to each of R, G, and B colors. 1 and each liquid crystal light valve 1
A cross dichroic prism 3 for synthesizing the modulated light 12 of each color modulated by the above, and a projection lens 4 as a projection optical system for magnifying and projecting the synthesized light.

The liquid crystal light valve 1 receives input RGB signals.
An image information signal corresponding to each color is modulated to form an image corresponding to each of R, G, and B colors. The color light including the image of each color of RGB formed by the liquid crystal light valve 1 has two dichroic films 3 having different wavelength selective reflection characteristics along a bonding surface of four triangular prisms.
Cross dichroic 3 in which a and 3b are formed in an X-shape
Are combined as one projection light 2. The combined projection light 2 is further enlarged and projected by the projection lens 4.
The projection lens 4 is detachably engaged with the case body of the projector 5 via the mount 13 and the like. The projector 5 is detachably held in a housing 10 of the rear projection display device. The projector 5 includes therein a circuit section 14 in which a signal processing circuit for inputting information such as a video signal is disposed, and a power supply circuit for supplying power to the liquid crystal light valve 1 and the signal processing circuit is disposed. This is an integrated unit structure including the power supply unit 17.

Input of information such as video signals to the projector 5 is performed by an interface unit 32 installed in the housing 10. Interface unit 32 and projector 5
Are connected by a connection cable or the like via a connector or the like, and are easily detachable.

The projector 5 has a mount 13 for engagement with the projection lens 4, thereby facilitating replacement of the projection lens 4. Further, the height of the projector 5 can be adjusted so that the optical axis of the projection light 2 output from the projector 5 can be adjusted in the up, down, left, right, front and rear directions, respectively. A foot 40 also serving as a joint is provided.

As shown in FIG. 3, the housing 10 is formed by engaging a plurality of panels (a mirror panel 18, two side panels 19, a floor panel 20, and two back panels 21). .

The mirror panel 18 is a mirror panel in which a panel member is engaged with the back surface (the inner surface side of the housing) of the mirror b16. The mirror panel 18 is swingably engaged with a frame 22 holding the transmission screen 8 via a hinge a23. Similarly, the two side panels 19 and the floor panel 20 are connected to the frame 2 holding the transmission screen 8.
2 are swingably engaged via hinges b24 and c25, respectively. Two back panels 21
Has hinges d26 on the side panels 19 adjacent to each other.
Is swingably engaged via the. An interface unit 32 for inputting information such as a video signal to the projector 5 described above is engaged with one back panel 21. The mirror a15 is swingably engaged with the frame 9 inside the housing 10 via a hinge e27. Further, the floor panel 20 is formed with a guide such as a hole so as to be positioned when the foot 40 of the projector 5 or the like is mounted. Further, the projector 5 is held so that the optical axis of the projection light 2 output from the projector 5 is perpendicular to the projection surface of the transmission screen 8. In each of the drawings, the optical axis of the projection light 2 is indicated by a dashed line, and the width of the light beam is indicated by a dotted line.

The projection light 2 output from the projector 5 is reflected by the mirror a15 toward the mirror b16, and further reflected by the mirror b16 toward the transmission screen 8. The mirror a15 and the mirror b16 form mirror surfaces by depositing a metal film on a film such as a polyester film. By attaching this film to a frame or the like to form a hollow structure, the weight of the mirror a15 and the mirror b16 is reduced and portability is increased. Also, mirror a15
Are engaged with a lock 30 provided on the floor panel 20 and a hinge e27 provided on the frame 23.

The projection light 2 reflected by the mirrors a15 and b16 is at an angle such that the optical axis of the principal ray of the projection light 2 intersects the center of the transmission screen 8 on which the projection light 2 is imaged. Incident. The observer 9 can view the projection light 2 formed on the transmission screen 8 from a direction opposite to the incident side of the projection light 2.

Next, FIG. 3 shows an external view of a rear projection type display device according to an embodiment of the present invention as viewed from the rear side of a housing 10, and based on FIGS. A method of folding the housing 10 when the display device is stored will be described. FIG. 4 is a diagram showing the storage of the rear projection type display device from the side, and FIG. 5 is a diagram also showing the storage from the top.

When storing the rear projection type display device, first, the connector connecting the projector 4 and the interface unit 32 is disconnected, and the projector 4 is detached from the floor panel 20, and as shown in FIG. Take it out of the housing 10. Next, a lock a2 that engages the mirror panel 18 and the two side panels 19 adjacent thereto, respectively.
8 and a lock b29 respectively engaging the mirror panel 18 with the two back panels 21 adjacent thereto.
Then, as shown in FIG. 4, the mirror panel 18 is rotated toward the transmission screen 8 around the hinge a23.

Similarly, the mirror a15 and the floor panel 20
The lock c30 which is engaged with the mirror c15 is removed, and the mirror a15 is hinged to the transmission screen 8 side as shown in FIG.
7 is rotated around the axis. Further, the floor panel 20 is shown in FIG.
As shown in the drawing, the hinge c25 is rotated toward the transmission screen 8 side.

Subsequently, the locks d31 engaging the left and right two panels of the back panel 21 are released, and the respective hinges d26 for engaging the respective back panels 21 with the side panels 19 adjacent to the side surfaces thereof are disengaged. Axle, back panel 2
1 are respectively rotated to the side panel 19 side and are brought into close contact with the side panel 19 respectively. Further, the two side panels 19 are rotated toward the transmission screen 8 as shown in FIG. 5 with the back panel 21 in close contact with the respective hinges b24 that engage with the frame 22 as axes. .

In this way, the projector 10 can be easily folded by taking out the projector 5 from the housing 10 and opening and closing each panel like a door around each hinge. Also, when used, it is possible to easily assemble it by developing it in the reverse procedure.

According to the above-described configuration, the mounting and dismounting of the projector 5 and the folding of the casing 10 take up little space when not in use or during transportation, and do not become bulky. In addition, each panel is
By engaging the hinges 2 with each other, each panel can be opened and closed like a door, and disassembly and assembly can be easily performed. Further, since the transmissive screen 8 can be centralized, it is easy to carry, and can be shared by each panel as a protective cover for the mirror when it is stored, so that there is no need for a separate member for protection. In addition, since the mirror is made of a film, it is possible to reduce the weight of the device and prevent breakage due to cracks or the like.
Furthermore, by taking out the projector 5 from the housing 10 and using it alone, it is possible to use it as a front projection display device. In addition, the projection lens 4 is replaced with a fixed focus lens when used in a rear projection display device and a variable focus lens when used as a front projection display device. The user can easily select.

In the present embodiment, the projector 5 has been described using an example in which three light transmitting liquid crystal light valves are used as modulation elements. However, the present invention is not limited to this. Instead of a light transmission type liquid crystal light valve, a light reflection type liquid crystal modulation element, a modulation element that modulates with a micromirror, a modulation element using only one modulation element, an electroluminescence (EL), etc. And the like using the self-luminous display element described above.

[0039]

As described above, the rear projection type display device of the present invention can be stored when not in use by folding the housing, and the thickness of the device can be reduced.
In addition, by adopting a structure in which a plurality of panels are combined, it is possible to easily disassemble and assemble and improve the strength. In addition, projectors, reflection mirrors, transmission screens,
By making each unit divisible, it is excellent in use by itself, repair and replacement, and maintainability. Further, by making the projection lens interchangeable, the user can easily select the size of the image and the projection method.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rear projection display device according to an embodiment of the present invention when viewed from a side.

FIG. 2 is an explanatory diagram of a projector according to the embodiment of the present invention.

FIG. 3 is an explanatory view of the housing according to the embodiment of the present invention, as viewed from the back.

FIG. 4 is an explanatory diagram of a folding method viewed from a side direction of the housing according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of a folding method as viewed from above the housing according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view of a rear projection display device showing a conventional technique, viewed from the side.

FIG. 7 is an explanatory view of a projector showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal light valve (image forming means) 2 Projection light 3 Cross dichroic prism 4 Projection lens (projection optical system) 5 Projector 6 Dichroic mirror 7 Mirror c 8 Transmissive screen 9 Observer 10 Housing 11 Light source 12 Modulated light 13 Mount 14 circuit 15 mirror a (reflecting means) 16 mirror b (reflecting means) 17 power supply 18 mirror panel 19 side panel 20 floor panel 21 back panel 22 frame 23 hinge a 24 hinge b 25 hinge c 26 hinge d 27 hinge e 28 lock a 29 lock b 30 lock c 31 lock d 32 interface unit

Claims (8)

[Claims] 1. A projector comprising: an image forming means for forming an image; and a projection optical system for projecting light emitted from the image forming means; and reflecting projection light emitted from the projector. A rear projection display device having, in a housing thereof, a reflection unit that performs reflection, and a transmission screen on which the projection light reflected by the reflection unit is projected, wherein the housing is configured to be foldable. Rear projection display device. 2. The rear projection display device according to claim 1, wherein said housing is an engaging body of a plurality of panels, and said panels are rotatably connected by engaging means. Rear projection display device. 3. The rear projection type display device according to claim 2, wherein each panel is configured to be foldable by rotating or moving so as to approach the transmissive screen. Display device. 4. A rear projection display apparatus according to claim 2, wherein said transmissive screen is fixed to a frame, and said panels are connected to said frame. apparatus. 5. The rear projection type display device according to claim 2, wherein when the panel is folded, the rear projection type display device also serves as protection means for the transmission type screen. 6. The rear projection display device according to claim 1, wherein said projector, said reflection means, and said transmission screen constitute separate units, and each unit is detachable. A rear projection display device, comprising: 7. A rear projection display device according to claim 1, wherein said reflection means comprises a film mirror. 8. The rear projection type display apparatus according to claim 1, wherein said projection optical system is exchangeably held with respect to said projector.