JP2009244371A - Projection type image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type image display device, easily switching an image using a projection type image display device reduced in a distance between the projection type image display device and a projection surface. <P>SOLUTION: This projection type image display device 100 includes an image light generating part 200 and a projection optical system 300. The projection type image display device 100 includes an external power supply obtaining part 500 and an internal power supply obtaining part 600. The projection optical system 300 has a reflecting mirror 320. The image light generating part 200 has an image control part 254 for generating an image light based on a second image data when the power is obtained by the internal power supply obtaining part 600. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projection display apparatus having a projection optical system for projecting image light.

  2. Description of the Related Art Conventionally, there is known a projection display apparatus including a light modulation element that modulates light emitted from a light source and a projection lens that projects light emitted from the light modulation element onto a projection surface (screen).

  Here, in order to display a large image on the screen, it is necessary to increase the distance between the projection lens and the screen. On the other hand, a projection display system has been proposed in which the distance between the projection display apparatus and the screen is reduced by using a reflection mirror that reflects the light emitted from the projection lens to the screen side ( For example, Patent Document 1).

Here, if the distance between the projection display apparatus and the screen is reduced, the projection display apparatus becomes closer to the screen and the projection display apparatus enters the user's field of view. It is necessary to perform oblique projection from the side. For example, in the above-described projection display system, the positional relationship between the light modulation element and the projection optical system is shifted in the vertical direction, and the projection distance is shortened and oblique projection is performed by using a concave mirror as the reflection mirror. .
JP 2006-235516 A (Claim 1, FIG. 1, etc.)

  By the way, there are new methods for installing and projecting a projection display device that shortens the projection distance, such as a method of installing the projection display device on the floor or desk and projecting it on the floor or desk. Possible installation / projection methods. On the other hand, there is not much consideration in what scene the new installation / projection method can be used.

  Therefore, the present invention has been made to solve the above-described problems, and easily switches an image using a projection image display device that shortens the distance between the projection image display device and a projection surface. It is an object of the present invention to provide a projection display apparatus that enables this.

  A projection display apparatus according to a first feature includes an image light generation unit (image light generation unit 200) that generates image light, and a projection optical system (projection plane 210) that projects the image light. A projection optical system 300). The projection optical system includes a reflection mirror (reflection mirror 320) that reflects the image light emitted from the image light generation unit. The projection display apparatus includes an external power acquisition unit (external power acquisition unit 500) that acquires power from the outside of the own device, and an internal power acquisition unit (internal power acquisition unit 600) that acquires power inside the device. Is provided. The video light generation unit includes an acquisition unit (reception unit 251) that acquires first video data from the outside of the apparatus, a storage unit (storage unit 252) that stores second video data, and a display on the projection plane. A video control unit (video control unit 254) that controls the video to be played. The video control unit generates the video light based on the second video data when power is acquired by the internal power supply acquisition unit.

  According to the first feature, the video control unit generates video light based on the second video data when power is acquired by the internal power supply acquisition unit. Therefore, the normal state in which power is acquired by the external power supply acquisition unit and the emergency state in which power is acquired by the internal power supply acquisition unit are detected, and in the emergency state, the image stored in advance is displayed on the projection surface. It can be controlled to be displayed.

  In the first feature, the video control unit generates the video light based on the first video data when power is acquired by the external power supply acquisition unit.

  In the first feature, the projection display apparatus includes a protection cover (protection cover 400a) provided on the optical path of the image light reflected by the reflection mirror. The protective cover has a transmission region (transmission region 410) that transmits the image light. The reflection mirror condenses the image light emitted from the image light generation unit between the reflection mirror and the projection plane. The transmission region is disposed in the vicinity of a position where the image light is collected by the reflection mirror.

  In the first feature, the acquisition unit receives the first video data via a network.

  In the first feature, the protective cover has an opening communicating from the reflection mirror side to the projection plane side. The transmissive region is the opening.

  In the first feature, at least a part of the protective cover is formed of a light transmissive member. The transmissive region is constituted by the light transmissive member.

  According to the present invention, it is possible to provide a projection display apparatus that can easily switch images using a projection display apparatus that shortens the distance between the projection display apparatus and the projection surface. Can do.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
(Arrangement of projection display device)
Hereinafter, the arrangement of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing an arrangement of a projection display apparatus 100 according to the first embodiment. As shown in FIG. 1, the projection display apparatus 100 is provided in a wall such as a predetermined route through which a passerby passes. The projection display apparatus 100 displays an image on a projection surface 210 provided on a road surface such as a predetermined route.

(Configuration of projection display device)
Hereinafter, the configuration of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 2 is a diagram illustrating a configuration of the projection display apparatus 100 according to the first embodiment.

  As shown in FIG. 2, the projection display apparatus 100 includes a housing 400 that houses the image light generation unit 200 and the projection optical system 300. In the first embodiment, a part of the housing 400 constitutes a protective cover 400a.

  The video light generation unit 200 generates video light. Specifically, the video light generation unit 200 includes at least a display element 40 that emits video light. The display element 40 is provided at a position shifted with respect to the optical axis L of the projection lens 310 provided in the projection optical system 300. The display element 40 is, for example, a reflective liquid crystal panel, a transmissive liquid crystal panel, or a DMD (Digital Micromirror Device). Details of the image light generation unit 200 will be described later (see FIG. 3).

  The projection optical system 300 projects the image light emitted from the image light generation unit 200. Here, the projection optical system 300 projects image light onto the projection plane 210. Specifically, the projection optical system 300 includes a projection lens 310 and a reflection mirror 320.

  The projection lens 310 emits the image light emitted from the image light generation unit 200 to the reflection mirror 320 side.

  The reflection mirror 320 reflects the image light emitted from the projection lens 310. The reflection mirror 320 condenses the image light and widens the image light. For example, the reflection mirror 320 is an aspherical mirror having a concave surface on the image light generation unit 200 side.

  The protective cover 400 a is a cover that protects the reflection mirror 320. The protective cover 400a is provided at least on the optical path of the image light reflected by the reflection mirror 320. The protective cover 400a has a transmission region 410 that transmits image light.

  As described above, the projection optical system 300 projects the image light transmitted through the transmission region 410 onto the projection plane 210.

  The projection display apparatus 100 includes an external power supply acquisition unit 500 and an internal power supply acquisition unit 600.

  The external power supply acquisition unit 500 acquires power from the outside of its own device. For example, the external power supply acquisition unit 500 is an AC power supply unit that acquires AC power supplied from a power company via a power line. The external power supply acquisition unit 500 may acquire power supplied via a power line from a private power generation device provided in a facility where the projection display apparatus 100 is provided.

  The internal power supply acquisition unit 600 acquires power in its own device. For example, the internal power supply acquisition unit 600 is an uninterruptible power supply (UPS). In a case where the external power supply acquisition unit 500 cannot acquire power (for example, a case where a power failure occurs), the internal power supply acquisition unit 600 acquires power instead of the external power supply acquisition unit 500.

(Configuration of image light generator)
Hereinafter, the configuration of the video light generation unit according to the first embodiment will be described with reference to the drawings. FIG. 3 is a diagram mainly illustrating the video light generation unit 200 according to the first embodiment. The video light generation unit 200 includes a power supply circuit (not shown), a video signal processing circuit (not shown), and the like in addition to the configuration shown in FIG. Here, a case where the display element 40 is a transmissive liquid crystal panel is illustrated.

  The video light generation unit 200 includes a light source 10, a fly-eye lens unit 20, a PBS array 30, a plurality of liquid crystal panels 40 (a liquid crystal panel 40R, a liquid crystal panel 40G, and a liquid crystal panel 40B), and a cross dichroic prism 50. .

  The light source 10 is a UHP lamp configured by a burner and a reflector. The light emitted from the light source 10 includes red component light, green component light, and blue component light.

  The fly-eye lens unit 20 makes the light emitted from the light source 10 uniform. Specifically, the fly eye lens unit 20 includes a fly eye lens 20a and a fly eye lens 20b.

  The fly-eye lens 20a and the fly-eye lens 20b are each composed of a plurality of minute lenses. Each microlens condenses the light emitted from the light source 10 so that the light emitted from the light source 10 is irradiated on the entire surface of the liquid crystal panel 40.

  The PBS array 30 aligns the polarization state of the light emitted from the fly-eye lens unit 20. In the first embodiment, the PBS array 30 aligns the light emitted from the fly-eye lens unit 20 with P-polarized light.

  The liquid crystal panel 40R modulates the red component light by rotating the polarization direction of the red component light. An incident-side polarizing plate 41R that transmits light having one polarization direction (for example, P-polarized light) and shields light having another polarization direction (for example, S-polarized light) on the light incident surface side of the liquid crystal panel 40R. Is provided. On the light exit surface side of the liquid crystal panel 40R, an exit-side polarizing plate 42R that blocks light having one polarization direction (for example, P-polarized light) and transmits light having another polarization direction (for example, S-polarized light). Is provided.

  Similarly, the liquid crystal panel 40G and the liquid crystal panel 40B modulate the green component light and the blue component light by rotating the polarization directions of the green component light and the blue component light, respectively. An incident side polarizing plate 41G is provided on the light incident surface side of the liquid crystal panel 40G, and an emission side polarizing plate 42G is provided on the light output surface side of the liquid crystal panel 40G. An incident side polarizing plate 41B is provided on the light incident surface side of the liquid crystal panel 40B, and an emission side polarizing plate 42B is provided on the light emitting surface side of the liquid crystal panel 40B.

  The cross dichroic prism 50 combines light emitted from the liquid crystal panel 40R, the liquid crystal panel 40G, and the liquid crystal panel 40B. The cross dichroic prism 50 emits combined light to the projection lens 310 side.

  The image light generation unit 200 includes a mirror group (dichroic mirror 111, dichroic mirror 112, reflection mirror 121 to reflection mirror 123), and a lens group (condenser lens 131, condenser lens 140R, condenser lens 140G, condenser lens 140B, relay). Lens 151 to relay lens 152).

  The dichroic mirror 111 transmits red component light and green component light in the light emitted from the PBS array 30. The dichroic mirror 111 reflects blue component light out of the light emitted from the PBS array 30.

  The dichroic mirror 112 transmits red component light out of the light transmitted through the dichroic mirror 111. The dichroic mirror 112 reflects green component light out of the light transmitted through the dichroic mirror 111.

  The reflection mirror 121 reflects the blue component light and guides the blue component light to the liquid crystal panel 40B side. The reflection mirror 122 and the reflection mirror 123 reflect the red component light and guide the red component light to the liquid crystal panel 40R side.

  The condenser lens 131 is a lens that collects white light emitted from the light source 10.

  The condenser lens 140R collimates the red component light so that the liquid crystal panel 40R is irradiated with the red component light. The condenser lens 140G collimates the green component light so that the liquid crystal panel 40G is irradiated with the green component light. The condenser lens 140B collimates the blue component light so that the liquid crystal panel 40B is irradiated with the blue component light.

  The relay lens 151 to the relay lens 152 substantially image the red component light on the liquid crystal panel 40R while suppressing the expansion of the red component light.

(Function of projection display device)
Hereinafter, functions of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 4 is a block diagram mainly showing the control unit 250 provided in the projection display apparatus 100 according to the first embodiment. The control unit 250 is provided in the video light generation unit 200.

  As illustrated in FIG. 4, the control unit 250 includes a reception unit 251, a storage unit 252, a detection unit 253, and a video control unit 254.

  The receiving unit 251 receives first video data constituting the first video from the network. The first video is, for example, an advertising video to be shown to a passerby who passes a predetermined route. The network is a WAN (Wide Area Network), a LAN (Local Area Network), or the like, and may be a wired line or a wireless line.

  The storage unit 252 stores second video data constituting the second video. The second video is a guide video that guides a passerby, for example, an evacuation route. The second video may be a monochromatic video such as a white video or a blue video. In such a case, the second image (monochromatic image) displayed on the projection plane 210 functions as a guide light that guides a passerby.

  The storage unit 252 is, for example, a nonvolatile memory (for example, a flash memory) provided in the control unit 250. The storage unit 252 may be a device (for example, a hard disk device) provided outside the control unit 250.

  The detection unit 253 detects the type of power source that supplies power to the own device. Specifically, the detection unit 253 detects whether the external power supply acquisition unit 500 acquires power or whether the internal power supply acquisition unit 600 acquires power. For example, the detection unit 253 monitors the internal power supply acquisition unit 600 and detects the switching of the power supply when the internal power supply acquisition unit 600 starts acquiring power.

  The video control unit 254 controls the video displayed on the projection plane 210. That is, the video control unit 254 controls the display element 40 (liquid crystal panel 40R to liquid crystal panel 40B).

  Specifically, the video control unit 254 generates video light based on the first video data when power is acquired by the external power supply acquisition unit 500. On the other hand, the video control unit 254 generates video light based on the second video data when power is acquired by the internal power supply acquisition unit 600.

  That is, when power is acquired by the external power acquisition unit 500, the first image is displayed on the projection plane 210. On the other hand, when power is acquired by the internal power supply acquisition unit 600, the second image is displayed on the projection plane 210.

(Function and effect)
In the first embodiment, the protective cover 400 a is provided on the optical path of the image light reflected by the reflection mirror 320. Therefore, it is possible to suppress the user from coming into contact with the reflection mirror 320 and changing the angle of the reflection mirror 320 and the like. Further, the protective cover 400a includes a transmission region 410 that transmits the image light reflected by the reflection mirror 320. Therefore, the image light irradiated onto the projection surface 210 is not hindered by the protective cover 400a. In this way, it is possible to maintain a satisfactory arrangement accuracy of the reflection mirror 320 provided for shortening the distance between the projection display apparatus 100 and the projection plane 210.

  The video control unit 254 generates video light based on the first video data when power is acquired by the external power supply acquisition unit 500. On the other hand, the video control unit 254 generates video light based on the second video data when power is acquired by the internal power supply acquisition unit 600.

  Therefore, an image displayed on the projection plane 210 can be appropriately switched between a normal state in which power is acquired by the external power acquisition unit 500 and an emergency state in which power is acquired by the internal power acquisition unit 600. .

  For example, the projection display apparatus 100 according to the first embodiment is preferably provided in a facility such as a hotel, a museum, a museum, or a department store.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  Although not particularly mentioned in the above-described embodiment, the protective cover 400a may have an opening that communicates from the reflection mirror 320 to the projection plane 210 side. The transmissive region 410 may be such an opening.

  Although not particularly mentioned in the above-described embodiment, at least a part of the protective cover 400a may be configured by a light transmissive member such as a transparent resin or glass. The transmissive region 410 may be configured by such a light transmissive member.

  Although not particularly mentioned in the above-described embodiment, the reflection mirror 320 condenses the image light emitted from the image light generation unit 200 between the reflection mirror 320 and the projection surface 210. The transmission region 410 is preferably provided in the vicinity of the position where the image light is collected by the reflection mirror 320.

  In the above-described embodiment, the case where an aspherical mirror is used as the reflecting mirror 320 is illustrated, but the reflecting mirror 320 is not limited to this. For example, a free-form surface mirror may be used as the reflection mirror 320. If the aberration and resolution are devised, a spherical mirror may be used as the reflection mirror 320.

  In the embodiment described above, the case (three-plate type) using a plurality of display elements 40 is illustrated as the configuration of the video light generation unit 200, but the configuration of the video light generation unit 200 is not limited to this. A single display element 40 may be used as the configuration of the image light generation unit 200 (single plate type).

  In the embodiment described above, the first video data constitutes a first video such as an advertisement video, but the first video data is not limited to this. The first video data may be data acquired from the outside via a network or a video input terminal.

  In the above-described embodiment, the second video data constitutes a second video such as a guide video or a monochromatic video, but the second video data is not limited to this. The second video data may be data stored in the storage unit 252.

  In the embodiment described above, the detection unit 253 detects the type of power supply that supplies power to the own device, but the configuration of the detection unit 253 is not limited to this. For example, the detection unit 253 may detect the switching of the power supply by detecting a power failure. The detection unit 253 may detect whether or not the first video data is supplied from the network.

  Although not particularly mentioned in the above-described embodiment, the projection surface 210 may be a surface on which image light is projected. For example, the projection surface 210 may be a wall surface, a floor surface, a ceiling, a glass window, or the like. However, during a disaster including a fire, the smoke fills upward, so that the projection display apparatus 100 preferably projects onto the projection plane 210 provided on the floor surface.

  According to each embodiment, as described above, the distance between the projection display apparatus and the projection surface is shortened by providing the reflection mirror 320. Accordingly, it is possible to prevent the person from entering between the projection display apparatus and the projection surface and blocking the image light. Further, when an LD is used as the light source 10, it is possible to reduce the possibility that a person is irradiated with laser light (image light).

1 is a diagram showing a projection display apparatus 100 according to a first embodiment. 1 is a diagram showing a projection display apparatus 100 according to a first embodiment. It is a figure which shows the structure of the image light production | generation part 200 which concerns on 1st Embodiment. It is a block diagram which mainly shows the control unit 250 which concerns on 1st Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Light source, 20 ... Fly eye lens unit, 30 ... PBS array, 40 ... Display element, 41 ... Incident side deflection plate, 42 ... Outgoing side deflection plate, 50 ... Cross dichroic prism, 100... Projection type image display device, 111... Dichroic mirror, 112... Dichroic mirror, 121 to 123. Lenses 151 to 152 Relay lens 200 Image light generating unit 210 Projection plane 250 Control unit 251 Receiving unit 252 Storage unit 253 .. detection unit, 254... Image control unit, 300... Projection optical system, 310... Projection lens, 320. · Protective cover, 410 ... transmitting region, 500 ... external power acquisition unit, 600 ... internal power acquisition unit

Claims (6)

A projection-type image display device comprising: an image light generation unit that generates image light; and a projection optical system that projects the image light onto a projection plane,
The projection optical system includes a reflection mirror that reflects the image light emitted from the image light generation unit,
An external power source acquisition unit for acquiring power from outside the own device and an internal power source acquisition unit for acquiring power inside the own device;
The video light generation unit includes an acquisition unit that acquires first video data from outside the device, a storage unit that stores second video data, and a video control unit that controls a video displayed on the projection plane. Have
The video control unit generates the video light based on the second video data when power is acquired by the internal power supply acquisition unit.   2. The projection display according to claim 1, wherein the video control unit generates the video light based on the first video data when power is acquired by the external power supply acquisition unit. apparatus. A protective cover provided on the optical path of the image light reflected by the reflecting mirror;
The protective cover has a transmission region that transmits the image light,
The reflection mirror condenses the image light emitted from the image light generation unit between the reflection mirror and the projection plane,
The projection image display apparatus according to claim 1, wherein the transmission region is disposed in a vicinity of a position where the image light is collected by the reflection mirror.   The projection image display apparatus according to claim 1, wherein the acquisition unit receives the first image data via a network. The protective cover has an opening communicating from the reflecting mirror side to the projection surface side,
The projection display apparatus according to claim 1, wherein the transmission region is the opening. At least a part of the protective cover is made of a light transmissive member,
The projection display apparatus according to claim 1, wherein the transmissive region is configured by the light transmissive member.

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