JP2009237369A - Projection video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection video display device, restraining increase in size of the projection type video display device even when the distance between the projection type video display device and a projection surface is shortened in displaying a video on a plurality of projection surfaces. <P>SOLUTION: This projection video display device 100 includes a video light generating part 200 having a display element 40 and a projection optical system 300 having a reflecting mirror 320. The display element 40 has a first display area 45 and a second display area 46. The reflecting mirror 320 has a first reflecting area 321 and a second reflecting area 322. The first reflecting area 321 reflects first video light emitted from the first display area 45, and condenses the first video light. The second reflecting area 322 reflects second video light emitted from the second display area 46 and condenses the second video light. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projection display apparatus having a projection optical system that projects image light onto a projection surface.

  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 the oblique projection is performed by using a convex mirror as the reflection mirror. .

On the other hand, a projection display system that can display images on a plurality of screens has also been proposed. Specifically, the projection display system is provided with a half mirror that reflects a part of the image light out of the image light emitted from the projection display apparatus and transmits the other part of the image light ( For example, Patent Document 2).
JP 2004-45894 A (Claim 1, FIG. 2, etc.) JP 05-107659 A (Claim 1, FIG. 1 etc.)

  Here, consider a case in which the distance between the projection display apparatus and the screen is reduced and the display of images on a plurality of screens is realized. For example, it is conceivable to arrange a half mirror on the optical path of the image light reflected by the reflection mirror by combining the background art described above.

  However, since the image light emitted from the projection display apparatus reaches the screen while widening the angle, a large size half mirror is required. Accordingly, when a half mirror is provided in the projection display apparatus, the projection display apparatus becomes large.

  Accordingly, the present invention has been made to solve the above-described problem, and in a case where an image is displayed on a plurality of projection surfaces, the distance between the projection display device and the projection surface is reduced. Even so, an object of the present invention is to provide a projection display apparatus that can suppress an increase in size of the projection display apparatus.

  The projection display apparatus according to the first feature projects an image light generation unit (image light generation unit 200) having a display element (display element 40) for generating image light, and projects the image light onto a projection plane. A projection optical system (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 display element has a first display area (first display area 45) and a second display area (second display area 46). The reflection mirror reflects the first video light emitted from the first display area and condenses the first video light, and the second display area. A second reflection region (second reflection region 322) that reflects the second video light emitted from the light source and collects the second video light.

  According to this feature, the display element has a first display area and a second display area, and the reflection mirror has a first reflection area and a second reflection area. Accordingly, it is possible to display an image at two places by one projection display apparatus.

  Further, the first reflection area collects the first video light emitted from the first display area. The second reflection area condenses the second video light emitted from the second display area. Therefore, it is possible to suppress an increase in the size of the projection display apparatus.

  As described above, in the case where images are displayed on a plurality of projection surfaces, even if the distance between the projection image display device and the projection surface is reduced, the enlargement of the projection image display device is suppressed. be able to.

  Furthermore, the display element has a first display region that emits the first video light and a second display region that emits the second video light. Accordingly, different images can be displayed on a plurality of projection surfaces.

  In the first feature, the projection display apparatus further includes a protective cover (protective cover 400) provided on the optical path of the image light reflected by the reflection mirror. The protective cover includes a transmission region that transmits the image light. The transmission region transmits a first transmission region (transmission region 410) that transmits the first video light reflected by the first reflection region and a second video light that is reflected by the second reflection region. A second transmission region (transmission region 420). The projection optical system projects the first video light transmitted through the first transmission region onto a first projection surface, and projects the second video light transmitted through the second transmission region onto a second projection surface. To do.

  In the first feature, the projection optical system includes a first half mirror (first half mirror 331) provided on an optical path of the first image light reflected by the first reflection region. The first transmission region includes a first transmission region (a) and a first transmission region (b). The first half mirror reflects a part of the first video light toward the first transmission region (a) and transmits the other part of the first video light toward the first transmission region (b).

  In the first feature, the projection optical system includes a second half mirror (second half mirror 332) provided on an optical path of the second video light reflected by the second reflection region. The second transmissive region includes a second transmissive region (a) and a second transmissive region (b). The second half mirror reflects a part of the second video light toward the second transmission region (a) and transmits the other part of the second video light toward the second transmission region (b).

  In the first feature, the first reflection region condenses the first video light emitted from the first display region between the first reflection region and the first projection plane. The first half mirror is disposed in the vicinity of a position where the first video light is collected by the first reflection region.

  In the first feature, the second reflection region condenses the second video light emitted from the second display region between the second reflection region and the second projection plane. The second half mirror is disposed in the vicinity of a position where the second video light is collected by the second reflection region.

  In the first feature, the first reflection region condenses the first video light emitted from the video light generation unit between the first reflection region and the first projection plane. The first transmission region is disposed in the vicinity of a position where the first video light is collected by the first reflection region.

  In the first feature, the second reflection region condenses the second image light emitted from the image light generation unit between the second reflection region and the second projection plane. The second transmission region is disposed in the vicinity of a position where the second video light is collected by the second reflection region.

  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.

  1st characteristic WHEREIN: At least one part of the said protective cover is comprised by the light transmissive member. The transmissive region is constituted by the light transmissive member.

  According to the present invention, in a case where images are displayed on a plurality of projection surfaces, even if the distance between the projection image display device and the projection surface is reduced, the projection image display device can be increased in size. It is possible to provide a projection display apparatus that can be suppressed.

  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]
(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. 1 is a diagram showing a configuration of a projection display apparatus 100 according to the first embodiment.

  As shown in FIG. 1, the projection display apparatus 100 includes an image light generation unit 200, a projection optical system 300, and a protective cover 400.

  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, 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. 2).

  Here, the display element 40 includes a first display area 45 that emits the first video light corresponding to the first image, and a second display area 46 that emits the second video light corresponding to the second image. The first image and the second image may be the same or different. Further, a separation region 47 is provided between the first display region 45 and the second display region 46 in order to separate the first video light and the second video light. The separation region 47 is preferably configured not to emit light. That is, it is preferable that a black image is displayed on the separation region 47.

  Here, the first display area 45 and the second display area 46 are provided at positions shifted with respect to the optical axis L of the projection optical system 300. Here, the first display region 45 is provided at a position shifted upward with respect to the optical axis L of the projection optical system 300. The second display area 46 is provided at a position shifted downward with respect to the optical axis L of the projection optical system 300.

  The projection optical system 300 projects the image light (first image light and second image light) emitted from the image light generation unit 200 onto a plurality of projection surfaces. Here, the projection optical system 300 projects the first video light on the projection plane 210 and projects the second video light on the projection plane 220. Specifically, the projection optical system 300 includes a projection lens 310 and a reflection mirror 320.

  The projection lens 310 emits image light (first image light and second image light) emitted from the image light generation unit 200 to the reflection mirror 320 side.

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

  Here, the reflection mirror 320 reflects the first video light emitted from the first display region 45 and collects the first video light, and the reflective mirror 320 exits the second display region 46. And a second reflection region 322 that reflects the second video light and collects the first video light.

  Here, the first reflection region 321 and the second reflection region 322 are provided at positions shifted with respect to the optical axis L of the projection optical system 300. Specifically, since the first display area 45 is provided at a position shifted upward with respect to the optical axis L, the first video light is emitted obliquely downward. Accordingly, the first reflection region 321 is provided at a position shifted downward with respect to the optical axis L of the projection optical system 300. On the other hand, since the second display region 46 is provided at a position shifted downward with respect to the optical axis L, the second video light is emitted obliquely upward. Therefore, the second reflection region 322 is provided at a position shifted upward with respect to the optical axis L of the projection optical system 300.

  The protective cover 400 is a cover that protects the reflection mirror 320. The protective cover 400 is provided at least on the optical path of the image light reflected by the reflection mirror 320. The protective cover 400 has a transmission region that transmits image light. Specifically, the protective cover 400 includes a transmission area 410 that transmits the first video light reflected by the first reflection area 321 and a transmission area 420 that transmits the second video light reflected by the second reflection area 322. And have. In the first embodiment, the transmission region 410 is provided on the side surface of the protective cover 400 facing the transmission region 420.

  As described above, the projection optical system 300 projects the first video light transmitted through the transmission region 410 onto the projection plane 210. The projection optical system 300 projects the second video light transmitted through the transmission area 420 onto the projection plane 220.

  Here, the projection surface 210 is, for example, a reflective screen that displays an image by reflecting image light. The projection surface 220 is, for example, a reflective screen that displays an image by reflecting image light.

  However, the orientation of the image displayed on the projection plane 210 and the projection plane 220 is adjusted by inverting the left and right of the first image displayed on the first display area 45 or the second image displayed on the second display area 46. can do. Therefore, an arbitrary type (reflection type or transmission type) screen can be used as the projection plane 210 and the projection plane 220.

(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. 2 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.

  Here, the liquid crystal panel 40R, the liquid crystal panel 40G, and the liquid crystal panel 40B each emit a first display region 45 that emits first video light corresponding to the first image and a second video light corresponding to the second image. It should be noted that the display area 46 has a second display area 46.

  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.

(Example of video display)
Hereinafter, a display example of an image according to the first embodiment will be described with reference to the drawings. 3 and 4 are diagrams illustrating display examples of video according to the first embodiment.

  Here, the images displayed on the projection plane 210 and the projection plane 220 are changed depending on the arrangement of the projection display apparatus 100 and the display element 40. Here, a case where the projection display apparatus 100 is arranged so that the transmission area 410 and the transmission area 420 are provided on the left and right sides of the projection display apparatus 100 is illustrated.

  As shown in FIG. 3, in the case where the display element 40 is provided so that the first display area 45 and the second display area 46 are longer in the vertical direction than in the horizontal direction, on the projection plane 210 and the projection plane 220, An image longer in the vertical direction than in the horizontal direction is displayed.

  On the other hand, as shown in FIG. 4, in the case where the display element 40 is provided so that the first display area 45 and the second display area 46 are longer in the horizontal direction than in the vertical direction, Displays an image longer in the horizontal direction than in the vertical direction.

(Function and effect)
In the first embodiment, the display element 40 has a first display area 45 and a second display area 46, and the reflection mirror 320 has a first reflection area 321 and a second reflection area 322. Accordingly, it is possible to display images at two places by one projection display apparatus 100.

  The first reflection area 321 collects the first video light emitted from the first display area 45. The second reflection area 322 collects the second video light emitted from the second display area 46. Therefore, an increase in the size of the projection display apparatus 100 can be suppressed.

  As described above, in the case of displaying an image on a plurality of projection surfaces (projection surface 210 and projection surface 220), even if the distance between the projection display apparatus 100 and the projection surface is reduced, the projection is performed. The enlargement of the type image display device 100 can be suppressed.

  Further, the display element 40 includes a first display region 45 that emits first video light and a second display region 46 that emits second video light. Accordingly, different images can be displayed on the projection plane 210 and the projection plane 220.

  In the first embodiment, the protective cover 400 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. In addition, the protective cover 400 includes a transmission region (a transmission region 410 and a transmission region 420) that transmits the image light reflected by the reflection mirror 320. Therefore, the image light irradiated on the projection surfaces (projection surface 210 and projection surface 220) is not hindered by the protective cover 400. As described above, it is possible to maintain a favorable arrangement accuracy of the reflection mirror 320 provided for shortening the distance between the projection display apparatus 100 and the projection surface.

  As an installation location of the projection display apparatus 100, a ceiling (floor) provided between an upper floor and a lower floor can be considered as shown in FIG. As a result, images can be displayed on the upper and lower floors.

  As the installation location of the projection display apparatus 100, a wall provided between a plurality of passages can be considered as shown in FIG. Thereby, an image can be displayed on the floor of each passage. In FIG. 6, it should be noted that the top and bottom of the second image displayed in the second display area 46 is inverted with respect to the first image displayed in the first display area 45.

  As an installation location of the projection display apparatus 100, the inside of a show window provided in a store can be considered. Thereby, a video can be shown to customers in the store and passers-by outside the store.

[Modification of First Embodiment]
Hereinafter, modifications of the first embodiment will be described with reference to the drawings. In the following, differences from the first embodiment will be mainly described. Specifically, in the second embodiment, as shown in FIG. 7, the display element 40 includes a first display element 141 having a first display area 45 and a second display element 142 having a second display area 46. including.

(Function and effect)
In the modification of the first embodiment, the first display area 45 and the second display area 46 are provided in separate display elements 40 (the first display element 141 and the second display element 142). Therefore, it is not necessary to provide the separation region 47 described above in the display element 40. In addition, images with different resolutions and images with different sizes can be displayed on the projection plane 210 and the projection plane 220.

[Second Embodiment]
Hereinafter, the second embodiment will be described with reference to the drawings. In the following, differences between the first embodiment and the second embodiment will be mainly described.

  Specifically, in the second embodiment, as shown in FIG. 8, the projection optical system 300 includes a first half mirror 331 and a second half mirror 332. The transmission region 410 includes a transmission region 410a and a transmission region 410b. The transmission region 420 includes a transmission region 420a and a transmission region 420b.

  The first half mirror 331 is provided on the optical path of the first video light reflected by the first reflection region 321. The first half mirror 331 reflects a part of the first video light toward the transmission region 410a and transmits a part of the first video light toward the transmission region 410b. Here, the first half mirror 331 has an inclination substantially perpendicular to the transmission region 410 and is provided at the boundary between the transmission region 410a and the transmission region 410b.

  The second half mirror 332 is provided on the optical path of the second video light reflected by the second reflection region 322. The second half mirror 332 reflects a part of the second video light toward the transmission region 420a and transmits a part of the second video light toward the transmission region 420b. Here, the second half mirror 332 has an inclination substantially perpendicular to the transmission region 420 and is provided at the boundary between the transmission region 420a and the transmission region 420b.

  The projection optical system 300 projects a part of the first video light reflected by the first half mirror 331 onto the projection surface 210a through the transmission region 410a, and other than the first video light transmitted through the first half mirror 331. The portion is projected onto the projection plane 210b through the transmission area 410b.

  The projection optical system 300 projects a part of the second image light reflected by the second half mirror 332 onto the projection surface 220a through the transmission region 420a, and other than the second image light transmitted through the second half mirror 332. The portion is projected onto the projection plane 220b through the transmission area 420b.

(Example of video display)
Hereinafter, a display example of an image according to the second embodiment will be described with reference to the drawings. FIG. 9 is a diagram illustrating a display example of a video according to the second embodiment.

  Here, the orientations of the images displayed on the projection surface 210 a and the projection surface 210 b are changed depending on the arrangement of the projection display apparatus 100 and the display element 40. Similarly, the orientations of the images displayed on the projection plane 220a and the projection plane 220b are changed depending on the arrangement of the projection display apparatus 100 and the display element 40.

  Here, a case where the projection display apparatus 100 is arranged so that the transmission area 410 and the transmission area 420 are provided on the left and right sides of the projection display apparatus 100 is illustrated.

  In FIG. 9, it should be noted that the orientation of the first image displayed in the first display area 45 is reversed left and right with respect to the orientation of the second image displayed in the second display area 46. . As shown in FIG. 9, the projection plane 210a and the projection plane 220b function as the same type (here, a reflection type) screen. On the other hand, the projection surface 210b and the projection surface 220a function as the same type (here, transmission type) screen.

  Here, consider a case where the orientation of the first image displayed in the first display area 45 is the same as the orientation of the second image displayed in the second display area 46. In such a case, the projection surface 210a and the projection surface 220a function as screens of the same type (reflection type or transmission type). On the other hand, the projection surface 210b and the projection surface 220b function as screens of the same type (reflection type or transmission type).

(Function and effect)
In the second embodiment, the projection optical system 300 includes a first half mirror 331 and a second half mirror 332. Therefore, the number of images that can be displayed by one projection display apparatus 100 can be increased.

[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 not specifically mentioned in the above-described embodiment, the protective cover 400 may have an opening that communicates from the first reflection region 321 to the projection plane 210 side. The transmissive region 410 may be such an opening. Similarly, the protective cover 400 may have an opening that communicates from the second reflection region 322 to the projection plane 220 side. The transmissive region 420 may be such an opening.

  Although not particularly mentioned in the above-described embodiment, at least a part of the protective cover 400 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. Similarly, the transmissive region 420 may be configured by such a light transmissive member.

  Although not particularly mentioned in the above-described embodiment, the first reflection region 321 condenses the first video light emitted from the video light generation unit 200 between the first reflection region 321 and the projection surface 210. The transmissive region 410 is preferably provided in the vicinity of the position where the first video light is collected by the first reflective region 321. Similarly, the second reflection region 322 collects the second image light emitted from the image light generation unit 200 between the second reflection region 322 and the projection plane 220. The transmission region 420 is preferably provided in the vicinity of the position where the second video light is collected by the second reflection region 322.

  Note that, according to the second embodiment, the first half mirror 331 is preferably provided in the vicinity of the position where the first video light is collected by the first reflection region 321. The second half mirror 332 is preferably provided in the vicinity of the position where the second video light is collected by the second reflection region 322.

  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).

  Although not particularly mentioned in the above-described embodiment, the projection plane 210 and the projection plane 220 may be planes on which image light is projected. Therefore, the projection plane 210 and the projection plane 220 do not have to be screens dedicated to the projection display apparatus. For example, the projection surface 210 and the projection surface 220 may be a wall surface, a floor surface, a ceiling, a glass window, or the like.

  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. It is a figure which shows the structure of the image light production | generation part 200 which concerns on 1st Embodiment. It is a figure shown about the example of a display concerning 1st Embodiment. It is a figure shown about the example of a display concerning 1st Embodiment. It is a figure shown about the example of installation concerning 1st Embodiment. It is a figure shown about the example of installation concerning 1st Embodiment. It is a figure which shows the projection type video display apparatus 100 which concerns on the modification of 1st Embodiment. It is a figure which shows the projection type video display apparatus 100 concerning 2nd Embodiment. It is a figure shown about the example of a display concerning 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Light source, 20 ... Fly eye lens unit, 30 ... PBS array, 40 ... Display element, 41 ... Incident side polarizing plate, 42 ... Outgoing side polarizing plate, 45 ... First display area, 46 ... second display area, 50 ... cross dichroic prism, 100 ... projection-type image display device, 111 ... dichroic mirror, 112 ... dichroic mirror, 121-123 ... Reflection mirror, 131 ... Condenser lens, 140 ... Condenser lens, 151-152 ... Relay lens, 200 ... Video light generator, 210 ... Projection surface, 220 ... Projection 300, projection optical system, 310, projection lens, 320, reflection mirror, 331, first half mirror, 332, second half mirror, 400,. Protective cover, 410 ... transmitting region, 420 ... transmission area

Claims (10)

A projection display apparatus comprising: an image light generator having a display element that generates image light; and a projection optical system that projects the image light onto a projection plane,
The projection optical system has a reflection mirror that reflects the image light emitted from the display element,
The display element has a first display area and a second display area,
The reflection mirror reflects the first video light emitted from the first display area and collects the first video light, and the second video emitted from the second display area. A projection display apparatus, comprising: a second reflection region that reflects light and condenses the second image light. 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 transmission region includes a first transmission region that transmits the first video light reflected by the first reflection region, and a second transmission region that transmits the second video light reflected by the second reflection region. Including
The projection optical system projects the first video light transmitted through the first transmission region onto a first projection surface, and projects the second video light transmitted through the second transmission region onto a second projection surface. The projection display apparatus according to claim 1, wherein: The projection optical system includes a first half mirror provided on an optical path of the first image light reflected by the first reflection region,
The first transmission region includes a first transmission region (a) and a first transmission region (b),
The first half mirror reflects a part of the first video light toward the first transmission region (a) and transmits the other part of the first video light toward the first transmission region (b). The projection display apparatus according to claim 2. The projection optical system has a second half mirror provided on the optical path of the second image light reflected by the second reflection region,
The second transmission region includes a second transmission region (a) and a second transmission region (b),
The second half mirror reflects a part of the second video light toward the second transmission region (a) and transmits the other part of the second video light toward the second transmission region (b). The projection display apparatus according to claim 3. The first reflective region condenses the first video light emitted from the first display region between the first reflective region and the first projection plane,
4. The projection display apparatus according to claim 3, wherein the first half mirror is disposed in a vicinity of a position where the first image light is collected by the first reflection region. 5. The second reflective region condenses the second video light emitted from the second display region between the second reflective region and the second projection plane,
5. The projection display apparatus according to claim 4, wherein the second half mirror is disposed in a vicinity of a position where the second image light is collected by the second reflection region. The first reflection region condenses the first video light emitted from the video light generation unit between the first reflection region and the first projection plane,
3. The projection display apparatus according to claim 2, wherein the first transmission region is disposed in a vicinity of a position where the first image light is condensed by the first reflection region. The second reflective region condenses the second video light emitted from the video light generation unit between the second reflective region and the second projection plane,
3. The projection display apparatus according to claim 2, wherein the second transmission region is disposed in a vicinity of a position where the second image light is condensed by the second reflection region. The protective cover has an opening communicating from the reflecting mirror side to the projection surface side,
The projection display apparatus according to claim 2, 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 2, wherein the transmission region is configured by the light transmissive member.

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