JP2007286349A - Screen, rear projector and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen, a rear projector and an image display device capable of effectively reducing scintillation. <P>SOLUTION: The screen 20 comprises: a screen body 12 having a diffusion layer 10; a frame 16 disposed along the perimeter of the screen body 12, to which the diffusion layer 10 is attached as rotatable via support members 14a, 14b; and a driving means 22 attached to the screen body 12 and rotating the diffusion layer 10 around the axes of the support members 14a, 14b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a screen, a rear projector, and an image display device.

  In recent years, projectors are rapidly spreading. In addition to front projection projectors that are mainly used for presentation purposes, in recent years, rear projection projectors have been gaining recognition as a form of large screen. The greatest advantage of the projection display device is that it can provide a product with the same screen size at a lower price than a direct-view display such as a liquid crystal television or a PDP. However, the low price has been developed even in the direct view type, and higher image quality performance is also demanded for the projection type display device.

  The projector irradiates light emitted from a light source onto a light modulation element such as a liquid crystal light valve, and projects the projection light modulated by the light modulation element onto the screen, thereby displaying an image on the screen. At this time, an image is displayed on the screen, and a peculiar phenomenon called scintillation in which the entire screen is glaring occurs.

Here, the principle of scintillation generation will be described with reference to FIGS. 10 (a) and 10 (b).
As shown in FIGS. 10A and 10B, the light emitted from the light source 70 passes through the liquid crystal light valve and is projected onto the screen 74 including the diffusing material 72. The projection light projected on the screen 74 is diffused by the diffusing material 72 contained in the screen 74. The diffused light is diffracted by the diffusing material 72 when passing through the screen and behaves like a secondary source wave. As shown in FIG. 10B, the two spherical waves generated by the secondary source waves are strengthened or weakened according to the phase relationship between the two waves, and interference fringes are formed between the screen surface and the viewer. Appears as When the viewer is focused on the image plane S where the interference fringes are generated, the viewer recognizes the interference fringes as scintillation that makes the screen surface glaring.

  Scintillation gives an uncomfortable feeling to a viewer who wants to see an image formed on the screen surface as if a veil, a lace cloth, or a spider web was stretched between the screen surface and the viewer. In addition, the viewer's eyes see a double image of the screen surface and scintillation, and they try to focus on each of them, which causes great fatigue.

  In recent years, development of a new light source to replace a high-pressure mercury lamp as a light source for a projector has been demanded. In particular, a laser light source is expected to be a light source for next-generation projectors in terms of energy efficiency, color reproducibility, long life, and instantaneous lighting. However, when a highly coherent laser light source is used instead of a high-pressure mercury lamp as the light source of the projector, the interference fringe contrast becomes higher, and the discomfort and fatigue due to scintillation are no longer tolerable.

Therefore, techniques for reducing scintillation have been widely proposed.
For example, Patent Document 1 discloses an emission side light diffusion layer formed of a plastic material mixed with a light diffusing material, an intermediate layer formed of a transparent plastic material, and a plastic mixed with a light diffusing material. A screen having an incident side light diffusion layer formed of a material is disclosed. Thereby, the scintillation generated in the incident side light diffusion layer is diffused again in the emission side light diffusion layer, thereby reducing the occurrence of scintillation.
Patent Documents 2 and 3 disclose image projection screens in which at least one of the light diffusion layers constituting the image projection screen is vibrated internally to change the relative positional relationship of the light diffusion layers. Thus, the occurrence of scintillation is reduced by applying internal vibration to the light diffusion layer.
JP 11-38512 A JP 2001-100316 A JP 2001-100317 A

However, the scintillation reduction methods disclosed in Patent Documents 1 to 3 have the following problems.
(1) In the above-mentioned Patent Document 1, since the exit side light diffusing layer is fixed, the phase distribution of the space between the screen and the viewer that interferes with light rays emitted from each point on the diffusing surface is also fixed. The interference fringes are also viewed as a fixed image. Therefore, there is a problem that the scintillation cannot be reduced essentially.
(2) In Patent Documents 2 and 3, extra driving energy is required because various vibration means such as light, electric field, magnetic field, heat, and stress are used. In addition, when these driving means are used, the energy transmission efficiency to the diffusion layer is low, resulting in vibration, sound, unnecessary electromagnetic waves, and exhaust heat, which hinders the viewer's comfortable viewing.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a screen, a rear projector, and an image display device that can effectively reduce scintillation.

  In order to solve the above problems, the present invention provides a screen main body having a diffusion layer, a frame portion provided along the outer periphery of the screen main body, and the diffusion layer is rotatably attached via a support member. And a drive means attached to the screen body and for rotating the diffusion layer around the axis of the support member.

According to this configuration, since the diffusion layer is rotatably attached to the frame portion via the support member, when the driving unit is driven, the diffusion layer rotates around the axis of the support member.
As a result, since the angle of the diffusion layer surface changes variously over time, the diffusion state of the light passing through the diffusion layer changes, and accordingly, interference generated by diffusion and diffraction of the diffusion layer of the screen body. The fringe pattern changes. Therefore, the interference fringes are integrated and averaged by the afterimage of the viewer's eyes, and scintillation can be reduced.

  In the screen of the present invention, the diffusion layer of the screen body is rectangular, the axis of the support member is arranged coaxially with the symmetry axis in the plane of the diffusion layer, and the support member is formed of the diffusion layer. It is also preferable that they are provided at two locations on opposite sides.

  According to this configuration, since the axis of the support member is coaxial with the axis of symmetry of the diffusion layer and both sides of the diffusion layer are supported (fixed) by the support member, more stable rotation around the axis of the support member is obtained. It is done. As a result, the energy required for rotation is only the moment of inertia, so that energy saving can be achieved.

  In the screen of the present invention, the screen body has a plurality of diffusion layers, and each of the plurality of diffusion layers is disposed on an optical axis of light projected on the screen body, It is also preferable that at least two of the diffusion layers are attached to the frame portion so as to be rotatable via the support member.

  According to this configuration, since the plurality of diffusion layers are rotatably attached to the frame portion via the support member, each of the plurality of diffusion layers relatively rotates. Thereby, the positions of the plurality of diffusion layers change relatively, and the scattering state of light passing through the screen changes with time. Along with this, the pattern of interference fringes generated by diffusion and diffraction of the diffusion layer of the screen body changes. Therefore, compared to the case where the diffusion layer is a single layer, the plurality of diffusion layers can be moved relatively, so that the interference fringes are integrated and averaged by the afterimage effect of the viewer's eyes, and more efficiently. Scintillation can be reduced.

  In the screen of the present invention, the driving means may be attached to each of the diffusion layers attached to the frame portion via the support member, and each of the driving means may be driven at a different frequency. preferable.

  According to this configuration, since each diffusion layer can be driven at different frequencies, each diffusion layer can be vibrated separately. Therefore, scintillation can be reduced more efficiently.

  The screen of the present invention includes a screen body having a diffusion layer, a first support member provided on the outer periphery of the screen body, having a first axis coaxial with the axis of symmetry of the diffusion layer, and an outer periphery of the screen body. A first frame portion that is provided along the outer periphery of the first frame portion, and is provided on the outer periphery of the first frame portion. A second support member having a second shaft extending in a direction intersecting with the shaft, and an outer periphery of the first frame portion, the first frame portion being rotatable via the second support member A second frame part attached to the screen body, and a driving means attached to at least one of the screen main body and the first frame part for rotating the diffusion layer around the first axis of the first support member, It is characterized by providing.

  According to this configuration, the first frame portion and the diffusion layer are independent of each other because the two rotation axes of the first shaft of the first support member and the second shaft of the second support member that intersect each other are provided. Then rotate. Thereby, since the diffusion layer moves in a Lissajous waveform, the randomness of the interference fringes is increased, and the integration averaging is performed more efficiently, and scintillation can be reduced.

  In the screen of the present invention, the diffusion layer of the screen body is rectangular, the first axis of the first support member is provided in parallel with one side of the diffusion layer, and the second support member It is also preferable that the second axis is provided orthogonal to the first axis of the first support member.

  According to this configuration, since the first axis and the second axis are orthogonal to each other, the first frame part attached to the second frame part and the diffusion layer attached to the first frame part have mutually different directions (θx Direction and θy direction). Thereby, the randomness of interference fringes becomes higher and scintillation can be reduced efficiently.

  The rear projector of the present invention includes a light source that emits light, a light modulation element that modulates the light emitted from the light source, and the screen on which the light modulated by the light modulation element is projected. Features.

  According to the present invention, since the screen is provided, a rear projector with reduced scintillation can be provided.

  According to another aspect of the present invention, there is provided an image display device comprising: a light source that emits light; the screen; and a scanning unit that scans the light emitted from the light source on the screen.

  According to the present invention, since the screen is provided, an image display apparatus with reduced scintillation can be provided.

Embodiments of the present invention will be described below with reference to the drawings.
In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size. In the following description, an xyz orthogonal coordinate system is set, and the positional relationship of each member will be described with reference to the xyz orthogonal coordinate system. A predetermined direction in the horizontal plane is the x direction, a direction orthogonal to the x direction in the horizontal plane is the y direction, a rotation direction around the X direction is θX, and a rotation direction around the Y direction is θY. In the present embodiment, the front side of the screen 20 is the viewer side where the viewer views the image, and the opposite side is the back side.

[First Embodiment]
FIG. 1A is a perspective view showing a schematic configuration of a rear projector 120 according to the present embodiment, and FIG. 1B is a side sectional view of the rear projector 120 shown in FIG. The rear projector 120 according to the present embodiment modulates the light emitted from the light source by the light modulation means, and enlarges and projects the modulated light onto the screen 20.

  As shown in FIG. 1A, the rear projector 120 includes a screen 20 on which an image is projected and a housing 90 attached to the back side of the screen 20. A front panel 88 is provided in the casing 90 below the screen 20, and an opening 38 for outputting sound from a speaker is provided on the left and right sides of the front panel 88.

Next, the internal structure of the housing 90 of the rear projector 120 will be described.
As shown in FIG. 1B, a projection optical system 150 is disposed below the interior of the housing 90 of the rear projector 120. Reflection mirrors 92 and 94 are provided between the projection optical system 150 and the screen 20, so that light emitted from the projection optical system 150 is reflected by the reflection mirrors 92 and 94 and projected onto the screen 20 in an enlarged manner. It has become.

Next, a schematic configuration of the projection optical system 150 of the rear projector 120 will be described.
FIG. 2 is a schematic diagram showing the configuration of the projection optical system 150 of the rear projector 120. In FIG. 2, the casing 90 constituting the rear projector 120 is omitted for simplification.

  The projection optical system 150 includes a light source 102, a light modulation element 100 that modulates light emitted from the light source 102, and a projection lens 114 that projects light modulated by the light modulation element 100. In the present embodiment, liquid crystal light valves 100R, 100G, and 100B are used as the light modulation element 100.

As shown in FIG. 2, the projection optical system 150 is provided with a lamp unit 102 made of a white light source such as a halogen lamp. The light emitted from the lamp unit (light source) 102 is separated into three primary colors of RGB by three mirrors 106 and two dichroic mirrors 108 disposed therein, and a liquid crystal light valve 100R corresponding to each primary color. (Red), 100G (green) and 100B (blue). Here, the liquid crystal light valves 100R, 100G, and 100B are respectively driven by R, G, and B primary color signals supplied from an image signal processing circuit (not shown).
Further, B (blue) light has a long optical path compared to other R (red) and G (green) colors, so that the incident lens 122, the relay lens 123, and the emission lens 124 can prevent loss. It is guided through a relay lens system 121.

  The light modulated by the liquid crystal light valves 100R, 100G, and 100B is incident on the dichroic prism 112 from three directions (liquid crystal light valves 100R, 100G, and 100B). The dichroic prism 112 refracts the light of R color and B color at 90 degrees and makes the light of G color go straight to synthesize the light from each light emitting part of each liquid crystal light valve 100R, 100G, 100B. It has become. Then, the combined light of each light emitting unit is projected onto the screen 20 via the projection lens 114.

Next, a schematic configuration of the screen 20 of the rear projector 120 will be described.
FIG. 3 is a perspective view showing a schematic configuration of the screen. In FIG. 3, the screen body 12 and the frame 16 are spaced apart from each other, but actually, as shown in FIG. 16 is covered.

  As shown in FIG. 3, the screen 20 includes a screen body 12, a frame 16 that supports the screen body 12, and a vibration motor 22 (drive means) that rotates the screen body 12 in a certain direction.

  The screen body 12 has a diffusion plate 10 (diffusion layer) having a rectangular shape in plan view. The diffusing plate 10 scatters the light projected on the screen body 12 to widen the viewer's visual field range, and the scattering material is uniformly dispersed in the diffusing plate 10. As the scattering material, silicon oxide, alumina, calcium carbonate, glass beads, copolymers such as acrylic resins, or amorphous organic materials such as silicone resins are preferably used. Further, a hard coat layer (not shown) for protecting the screen body 12 such as the diffusion plate 10 is attached to the surface of the diffusion plate 10 on the viewer side.

  The frame 16 is formed in a frame shape along the outer periphery of the diffusion plate 10, and is arranged with a certain distance from the diffusion plate 10. The frame 16 may be configured integrally with the housing shown in FIG.

  A rotating shaft 14a (support member shaft) protruding downward is formed on the inner peripheral side surface 16a of the upper portion of the frame 16, and a rotating shaft 14b protruding upward is formed on the inner peripheral side surface 16b of the lower portion of the frame 16. Has been. Further, on the upper side and the lower side of the diffusion plate 10, bearing portions for rotatably supporting the rotation shafts 14 a and 14 b are formed, and the rotation shaft formed on the frame 16 on the bearing portions. 14a and 14b are fitted. At this time, the symmetry axis O extending in the short direction of the diffusion plate 10 is disposed coaxially with the rotation shafts 14 a and 14 b formed on the frame 16. Thereby, the diffusing plate 10 can be rotated around the rotating shafts 14 a and 14 b (θy direction) formed on the frame 16. In this embodiment, the symmetric axis O of the diffusing plate 10 is the rotating shaft. It has become.

  A vibration motor 22 is attached to the lower left non-image display area on the back side of the diffusion plate 10. The vibration motor 22 is connected to a control unit 24 provided inside the housing, and can vibrate at a predetermined frequency by a drive signal supplied from the control unit 24. The control unit 24 drives the vibration motor 22 at the same time that the rear projector is turned on and an image is projected onto the screen. Thereby, the diffusing plate 10 rotates around the rotation shafts 14a and 14b (θy direction). On the other hand, when the power is turned off and the screen image is not projected, the drive of the vibration motor 22 is stopped.

  In the above embodiment, the pivot shaft is formed on the frame and the bearing of the pivot shaft is formed on the screen. However, the present invention is not limited to this. For example, the rotation shaft may be formed on the screen, and the bearing of the rotation shaft may be formed on the frame.

  According to this embodiment, since the diffusion plate 10 is rotatably attached to the frame 16 via the rotation shafts 14a and 14b, when the motor 22 is driven, the diffusion plate 10 is moved around the rotation shafts 14a and 14b. Rotate. Further, since the rotation shaft 14 is coaxial with the symmetry axis O of the diffusion plate 10 and both sides of the diffusion plate 10 are supported (fixed) by the rotation shafts 14a and 14b, the rotation shafts 14a and 14b are more stable. Rotation is obtained. Thereby, since the angle of the surface of the diffusing plate 10 changes variously over time, the diffusion state of the light passing through the diffusing plate 10 changes, and accordingly, the diffusion and diffraction of the diffusing plate 10 of the screen main body 12 changes. The pattern of interference fringes generated by the above changes. Therefore, the interference fringes are integrated and averaged by the afterimage of the viewer's eyes, and scintillation can be reduced. In addition, since the energy required for rotation is only the moment of inertia, energy saving can be achieved.

[Second Embodiment]
Next, the present embodiment will be described with reference to the drawings.
In the above embodiment, the vibration motor is used as the driving unit. However, in the present embodiment, a linear motor is used as the driving unit. Since the other rear projectors have the same configuration as that of the first embodiment, common constituent elements are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 4 is a perspective view showing a schematic configuration of the screen.
A rotation shaft 14a protruding rightward is formed on the inner peripheral side surface 16a of the left portion of the frame 16, and a rotation shaft 14b protruding leftward is formed on the inner peripheral side surface 16b of the right portion of the frame 16. Yes. Further, on the upper side and the lower side of the diffusion plate 10, bearing portions for rotatably supporting the rotation shafts 14 a and 14 b are formed, and the rotation shaft formed on the frame 16 on the bearing portions. 14a and 14b are fitted. At this time, the symmetry axis O extending in the longitudinal direction of the diffusion plate 10 is arranged coaxially with the rotation shafts 14 a and 14 b formed on the frame 16. Thereby, the diffusion plate 10 can be rotated around the rotation shafts 14 a and 14 b (θx direction) formed on the frame 16. In this embodiment, the symmetric axis O of the diffusion plate 10 is the rotation shaft. It has become.

  A linear motor 22 (driving means) is provided between the lower side of the diffusing plate 10 and the lower portion of the frame 16, and a movable portion of the linear motor 22 is attached to the lower side of the diffusing plate 10. The linear motor 22 is connected to a control unit 24 provided in the housing 90 and reciprocates at a predetermined frequency by a drive signal supplied from the control unit 24. The control unit 24 drives the vibration motor 22 at the same time that the rear projector is turned on and an image is projected onto the screen. Thereby, the diffusing plate 10 rotates around the rotation shafts 14a and 14b (θx direction). On the other hand, when the power is turned off and the screen image is not projected, the drive of the vibration motor 22 is stopped.

  Also in the present embodiment, as in the first embodiment, the diffusion plate 10 is rotated around the rotation shafts 14 and 14 by the reciprocating motion of the linear motor 22, so that the interference fringes are integrated by the afterimage of the viewer's eyes. Averaging can reduce scintillation.

[Third Embodiment]
Next, the present embodiment will be described with reference to the drawings.
The present embodiment is different from the first and second embodiments in that a crank motor is used as the driving means. Since the other rear projectors have the same configuration as that of the first embodiment, common constituent elements are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 5A is a perspective view showing a schematic configuration of the screen, and FIG. 5B is an enlarged view of a screen portion to which a crank motor is attached.

  A rotation shaft 14a protruding rightward is formed on the inner peripheral side surface 16a of the left portion of the frame 16, and a rotation shaft 14b protruding leftward is formed on the inner peripheral side surface 16b of the right portion of the frame 16. Yes. Further, on the upper side and the lower side of the diffusion plate 10, bearing portions for rotatably supporting the rotation shafts 14 a and 14 b are formed, and the rotation shaft formed on the frame 16 on the bearing portions. 14a and 14b are fitted. At this time, the symmetry axis O extending in the longitudinal direction of the diffusion plate 10 is arranged coaxially with the rotation shafts 14 a and 14 b formed on the frame 16.

A crank motor 22 (driving means) is attached to the rear left side of the lower left portion of the frame 16. The crank motor 22 is connected to a control unit 24 provided inside the housing 90. The crank motor 22 is arranged so that the rotation axis C is parallel to the surface of the diffusion plate 10 at rest. A rectangular plate member 50 is attached to the tip of the rotation shaft C with the plate member 50 surface being perpendicular to the rotation shaft C. A connecting rod 52 extending perpendicularly to the surface of the plate member 50 is attached to a corner portion of the plate member 50 that is shifted from the center (rotation axis C) of the plate member 50.
On the other hand, a connecting rod 26 extending parallel to the surface of the diffusion plate 10 is attached to the lower left corner of the diffusion plate 10 of the screen body 12.
The connecting rod 52 of the crank motor 22 and the connecting rod 26 of the diffusion plate 10 are connected to each other by an annular rubber material 28. As a result, when the drive of the crank motor 22 is driven, the diffusion plate 10 rotates around the rotation axis C.

  According to this embodiment, when the crank motor 22 is driven, the diffusion plate 10 rotates around the rotation shafts 14 a and 14 b formed in the frame 16 (θx direction). Therefore, as in the first embodiment, the interference fringes are integrated and averaged by the afterimage of the viewer's eyes, and scintillation can be reduced.

[Fourth Embodiment]
Next, the present embodiment will be described with reference to the drawings.
In the above embodiment, the diffusion plate is rotated by one rotation shaft. In contrast, the present embodiment is different in that the diffusion plate is rotated by two rotation shafts. Since the other rear projectors have the same configuration as that of the first embodiment, common constituent elements are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 6 is a perspective view showing a schematic configuration of the screen.
As shown in FIG. 6, a first frame 16 a (first frame portion) is formed in a frame shape on the outer periphery of the diffusion plate 10 along the outer periphery of the diffusion plate 10, with a certain distance from the diffusion plate 10. Has been placed.

  A rotating shaft 14a (first axis of the first support member) protruding downward is formed on the inner peripheral side surface 16a of the left portion of the first frame 16, and is formed on the inner peripheral side surface 16b of the right portion of the first frame 16. A pivot shaft 14b protruding upward is formed to face the pivot shaft 14a. Further, on the upper side and the lower side of the diffusion plate 10, bearing portions for rotatably supporting the rotation shafts 14 a and 14 b are formed, and the rotation shaft formed on the frame 16 on the bearing portions. 14a and 14b are fitted. At this time, the symmetry axis O2 extending in the longitudinal direction of the diffusion plate 10 is arranged coaxially with the rotation shafts 14a and 14b formed on the frame 16. Thereby, the diffusing plate 10 can be rotated around the rotation shafts 14 a and 14 b (θx direction) formed on the frame 16.

  A vibration motor 22 a is attached to the lower left side on the back side of the diffusion plate 10. The vibration motor 22 a is connected to a control unit 24 provided in the housing 90.

  As shown in FIG. 6, a second frame 16b (second frame portion) is formed in a frame shape on the outer periphery of the first frame 16a along the outer periphery of the first frame 16a. It is arranged with a gap.

  A rotating shaft 18a (second shaft of the second support member) that protrudes downward is formed on the inner peripheral side surface 17a of the upper part of the second frame 17, and an upper side of the inner peripheral side face 17b of the lower part of the second frame 16b. A rotating shaft 18b is formed so as to protrude from the center. And the bearing part for supporting the rotating shafts 18a and 18b so that rotation is possible is formed in the upper side and lower side of the diffusion plate 10, and the rotating shaft formed in the flame | frame 17 in this bearing part. 18a and 18b are fitted. At this time, the symmetry axis O <b> 1 extending in the short direction of the diffusion plate 10 is arranged coaxially with the rotation shafts 18 a and 18 b formed on the frame 17. Thereby, the diffusing plate 10 can be rotated around the rotation shafts 18 a and 18 b (θy direction) formed on the frame 16.

  A vibration motor 22 b is attached to the lower left portion of the outer peripheral surface of the first frame 16. The vibration motor 22 b is connected to the control unit 24 provided in the housing 90.

  According to the present embodiment, since the screen 20 has two rotation shafts of the rotation shafts 14a and 14b and the rotation shafts 18a and 18b intersecting with each other, the first frame 16 attached to the second frame 17; The diffusing plate 10 attached to the first frame 16 rotates in different directions (θx direction and θy direction). Thereby, since the diffusing plate 10 moves like a Lissajous waveform, the randomness of the interference fringes is increased, the integration averaging is performed more efficiently, and scintillation can be reduced.

[Fifth Embodiment]
Next, the present embodiment will be described with reference to the drawings.
In the said embodiment, the screen main body was comprised by the diffuser plate of 1 layer. On the other hand, the present embodiment is different in that the screen body is composed of a plurality of diffusion plates. Since the other rear projectors have the same configuration as that of the first embodiment, common constituent elements are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 7 is a perspective view showing a schematic configuration of the screen body according to the present embodiment, and FIG. 8 is a diagram showing a configuration of a plurality of diffusion plates.
As shown in FIGS. 7 and 8, the screen body 12 includes a diffusion plate 10, a lenticular lens 42 that compresses (condenses) an image, and a Fresnel lens 40 that converts light projected on the screen 20 into parallel light. Have These layers are arranged in this order from the viewer side on the optical axis L of the projected projection light, from the viewer side, the diffusing plate 10, the lenticular lens 42, and the Fresnel lens 40.
A hard coat layer is pasted on the surface of the diffuser plate 10 on the viewer side. A black mask 44 is formed in a lattice pattern on the viewer side surface of the lenticular lens 42.

  As shown in FIG. 7, each of the diffusion plate 10, the lenticular lens 42, and the Fresnel lens 40 is rotatably attached to the frame 16 via the support member 14. A vibration motor 22 is attached to each of the diffusion plate 10, the lenticular lens 42, and the Fresnel lens 40. The vibration motor 22 attached to each of the diffusion plate 10, the lenticular lens 42, and the Fresnel lens 40 supplies drive signals to each layer at different periods.

  According to the present embodiment, since each of the diffusion plate 10, the lenticular lens 42, and the Fresnel lens 40 is relatively rotated, even a slight movement is possible as compared with the configuration in which one of the multilayers is moved. Intricately, scattering characteristics and interference fringe patterns change. Accordingly, the interference fringes are integrated and averaged by the afterimage effect of the viewer's eyes, and scintillation can be more efficiently reduced.

  Moreover, according to this embodiment, since the several layers 10, 40, and 42 can be driven at a different frequency, each diffuser plate 10 can be vibrated separately. Therefore, scintillation can be reduced more efficiently.

[Sixth Embodiment]
Next, the present embodiment will be described with reference to the drawings.
This embodiment is different in that a scanning unit is used instead of a light modulation element as a configuration of the rear projector. Since the other screen configurations are the same as those in the first embodiment, common components are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 9 is a cross-sectional view showing a schematic configuration of rear projector 120.
As shown in FIG. 9, the rear projector 120 according to the present embodiment includes a light source 102 that emits laser light, a lens optical system 103 that includes a collimating optical system 104 and a beam shaping optical system 105, and incident laser light. A scanner 82 that scans in a two-dimensional direction, a projection lens 108 that magnifies and projects the scanned light, and a reflection mirror 109 that reflects the projected light toward the screen 120 are provided. The light source 102 includes a red laser diode 102R that emits red laser light, a green laser diode 102G that emits green laser light, and a blue laser diode 102B that emits blue laser light.

  Laser light emitted from the laser diodes 102R, 102G, and 102B enters the scanner 82 via the lens optical system 103. The incident laser light is scanned (scanned) in a two-dimensional direction by the scanner 82 and projected onto the screen 20 via the projection lens 108 and the reflection mirror 109. In this way, the rear projector 120-of this embodiment forms an image by causing the scanner 82 to scan the light on the screen 20 with the laser light emitted from the light source 102.

  In the scan type rear projector 120 using the laser light source as in the present embodiment, the screen 20 is rotatably attached to the frame 16 via the support members 14a and 14b. An effect is obtained and scintillation can be effectively reduced.

It should be noted that the technical scope of the present invention is not limited to the above-described embodiments, and includes those in which various modifications are made to the above-described embodiments without departing from the spirit of the present invention.
For example, in the above-described embodiment, the rotation shaft serving as the support member is arranged coaxially with the symmetry axis of the diffusion plate. However, even when the rotation shaft serving as the support member deviating from the symmetry axis is disposed, The effect of this can be achieved.
Furthermore, in the above-described embodiment, an example in which a transmissive liquid crystal light valve is used as the light modulation element has been described. However, a reflective liquid crystal light valve and a micromirror array device can be used as the light modulation element. In that case, the configuration of the projection optical system is appropriately changed.

1 is a schematic configuration diagram of a rear projector according to an embodiment of the present invention. It is a schematic block diagram of the projection optical system of the rear projector which concerns on embodiment of this invention. It is a schematic block diagram of the screen which concerns on 1st Embodiment. It is a schematic block diagram of the screen which concerns on 2nd Embodiment. It is a schematic block diagram of the screen which concerns on 3rd Embodiment. It is a schematic block diagram of the screen which concerns on 4th Embodiment. It is a schematic block diagram of the screen which concerns on 5th Embodiment. It is a schematic block diagram of a screen main body having a plurality of diffusion function layers. It is a schematic block diagram of the rear projector which concerns on 6th Embodiment. It is a figure for demonstrating the generation | occurrence | production principle of scintillation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Diffusing plate (diffusion layer), 12 ... Screen main body, 14a, 14b ... Rotating shaft (supporting member axis, first supporting member first axis), 16 ... Frame (frame part, first frame part) 17 ... 2nd frame (2nd frame part), 18 ... Turning axis (2nd axis | shaft of a 2nd support member), 20 ... Screen, 22 ... Vibration motor, linear motor, crank motor (drive means), 40 ... Fresnel lens 42 ... Lenticular lens 44 ... Black mask

Claims (8)

A screen body having a diffusion layer;
A frame portion provided along an outer periphery of the screen body, and the diffusion layer is rotatably attached via a support member;
A drive means attached to the screen body and for rotating the diffusion layer around the axis of the support member;
A screen characterized by comprising: The diffusion layer of the screen body is rectangular;
The axis of the support member is arranged coaxially with the symmetry axis in the plane of the diffusion layer;
The screen according to claim 1, wherein the supporting member is provided at two locations on the opposite side of the diffusion layer. The screen body has a plurality of the diffusion layers,
Each of the plurality of diffusion layers is disposed on an optical axis of light projected on the screen body,
3. The screen according to claim 1, wherein at least two of the plurality of diffusion layers are rotatably attached to the frame portion via the support member. The driving means is attached to each of the diffusion layers attached to the frame portion via the support member,
The screen according to claim 3, wherein each of the driving means is driven at a different frequency. A screen body having a diffusion layer;
A first support member provided on an outer periphery of the screen body and having a first axis coaxial with a symmetry axis of the diffusion layer;
A first frame portion provided along an outer periphery of the screen body, and the diffusion layer is rotatably attached via the first support member;
A second support member having a second shaft provided on an outer periphery of the first frame portion and extending in a direction intersecting with the first shaft of the first support member;
A second frame portion provided along an outer periphery of the first frame portion, the first frame portion being rotatably attached via the second support member;
Driving means attached to at least one of the screen main body and the first frame portion and rotating the diffusion layer around the first axis of the first support member;
A screen characterized by comprising: The diffusion layer of the screen body is rectangular;
The first axis of the first support member is provided in parallel with one side of the diffusion layer;
The screen according to claim 5, wherein the second axis of the second support member is provided orthogonal to the first axis of the first support member. A light source that emits light;
A light modulation element that modulates light emitted from the light source;
The screen according to any one of claims 1 to 6, wherein light modulated by the light modulation element is projected;
A rear projector comprising: A light source that emits light;
The screen according to any one of claims 1 to 6, and
A scanning unit that scans the light emitted from the light source on the screen;
An image display device comprising:

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