JP2007286347A - 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 and a frame 16 disposed along the perimeter of the diffusion layer 10 via a support member 14, wherein the diffusion layer 10 is attached to the frame 16 as capable of oscillating in a direction intersecting the plane of the diffusion layer 10 by the support member 14. <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 and a rear projector in which scintillation is effectively reduced.

  In order to solve the above-described problems, the present invention includes a screen body having a diffusion layer and a frame portion provided via a support member along the outer periphery of the diffusion layer, and the diffusion layer is the support member. Is attached to the frame portion so as to be able to vibrate in a direction crossing the surface of the diffusion layer.

  In the screen of the present invention, the screen body has a plurality of the diffusion layers, and at least one of the diffusion layers intersects the surface of the diffusion layer via the support member. It is also preferable that it is attached to the frame portion so as to vibrate.

According to this configuration, since the diffusion layer is attached to the frame so as to vibrate, when disturbance vibration is applied to the screen, the diffusion layer vibrates passively in a direction intersecting the plane of the diffusion layer. Here, disturbance vibration means vibration due to sound output from the speaker of the rear projector, or external environment in which the rear projector is disposed, such as floor vibration, vibration due to wind, and the like. Thereby, the diffusion state of the light passing through the diffusion layer of the screen body changes, and accordingly, the pattern of interference fringes generated by diffusion and diffraction of the diffusion layer of the screen body changes. Therefore, interference fringes are integrated and averaged, and scintillation can be reduced.
Further, disturbance vibration is used for vibration of the diffusion layer, and vibration generating means such as light and electric field is not used, so that scintillation can be reduced without requiring extra driving energy.

  In the screen of the present invention, the screen body has a plurality of diffusion layers, and at least two of the diffusion layers intersect the plane of the diffusion layer via the support member. It is also preferable that it is attached to the frame part so as to vibrate in the direction.

  According to this configuration, since at least two or more diffusion layers are attached to the frame portion through the support member so as to vibrate, when disturbance vibrations are applied to these diffusion layers, each of the plurality of diffusion layers is relative to each other. Vibrate. As a result, the positions of the plurality of diffusion layers change relatively, and the diffusion state of the light passing through the screen changes with time, and accordingly, interference fringes generated by diffusion and diffraction of the diffusion layer of the screen body The pattern changes. Therefore, as compared with the case where the diffusion layer is a single layer, a plurality of diffusion layers can be relatively vibrated, so that integration is averaged by the afterimage effect of the viewer's eyes, and scintillation is reduced more efficiently. Can be made.

  In the screen of the present invention, the support member is preferably made of an elastic material.

  According to this configuration, the disturbance vibration applied to the diffusion layer and the frame portion is transmitted to the support member made of an elastic material. Part of the vibration transmitted to the support member is repelled again by the diffusion layer by the elastic force of the support member. Therefore, in addition to disturbance vibration, the diffusion layer is urged by the support member and vibrates. Thereby, the diffusion layer can be vibrated more efficiently.

  The screen of the present invention includes a screen body having a flexible diffusion layer, and a frame provided along an outer periphery of the diffusion layer, and the flexible diffusion layer is the diffusion layer. It is attached in a state of being stretched on the frame portion so as to be capable of vibrating in a direction crossing the surface of the layer.

  According to this configuration, since the diffusion layer having flexibility is attached in a state of being stretched on the frame portion, when disturbance vibration is applied to the diffusion layer, the diffusion layer intersects the surface of the diffusion layer. Vibrate. Accordingly, the diffusion state of the light passing through the diffusion layer of the screen body changes, and accordingly, the pattern of interference fringes generated by the diffusion and diffraction of the diffusion layer of the screen body changes. Thereby, interference fringes are integrated and averaged, and scintillation can be reduced.

  In the screen of the present invention, a diffusion layer different from the flexible diffusion layer is attached to the frame portion apart from the flexible diffusion layer, and a space surrounded by the frame portion is It is also preferable that it is sealed by the diffusion layer attached to the frame portion.

  According to this configuration, since the space surrounded by the frame is sealed by the diffusion layer, when disturbance vibration is applied to the screen, a change in atmospheric pressure occurs in the sealed space, and the vibration is transmitted into the space. Is done. A part of the transmitted vibration is reflected by the inner surface of the diffusion layer and the frame portion, and is absorbed again by the diffusion layer to vibrate the diffusion layer. Therefore, the diffusion layer can be vibrated more efficiently.

  In the screen of the present invention, it is also preferable that the different diffusion layers have flexibility.

  According to this configuration, the space surrounded by the frame portion is sealed by the two diffusion layers having flexibility. Therefore, even when disturbance vibration is applied only to one diffusion layer, the vibration applied to one diffusion layer is transmitted to the other diffusion layer through the sealed space, and the other diffusion layer resonates. Therefore, since the two diffusion layers vibrate relatively, the interference fringes are integrated and averaged, and scintillation can be reduced more effectively.

  In the screen of the present invention, it is also preferable that the flexible diffusion layer is attached to the frame portion with uniform tension in all directions within the surface of the diffusion layer.

  According to this configuration, since the diffusion layer is attached to the frame portion with uniform tension in all directions, the Q value at the resonance frequency is increased. Thus, when disturbance vibration is applied to the diffusion layer, the diffusion layer reacts sensitively and resonates, so that the diffusion layer can be periodically vibrated.

  In the screen of the present invention, it is also preferable that the flexible diffusion layer is disposed on the outer surface side of the screen body.

  According to this configuration, by arranging the outer surface side of the screen main body on which the flexible diffusion plate is disposed on the viewer side, the diffusion plate can be vibrated at a position closest to the viewer. Scintillation can be effectively reduced.

  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. .

  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 an x direction, a direction orthogonal to the x direction in the horizontal plane is a y direction, and a direction orthogonal to each of the x direction and the y direction is a z direction. In the present embodiment, the front side of the screen 20 shown in the figure 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 is a rear projection type projector that modulates light emitted from a light source by a light modulation element 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 provided 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 the 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. 3A is a perspective view illustrating a schematic configuration of the screen 20, and FIG. 3B is a cross-sectional view taken along the line AA ′ of the screen 20 in FIG. In FIG. 3, the screen main body 12 is arranged at a certain distance from the frame 16, but actually, as shown in FIG. Is covered by the overhanging frame 16.

  As shown in FIG. 3, the screen 20 includes a screen body 12 and a frame 16 (frame portion) that supports the screen body 12 via a rubber material 14 (support member).

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

  The frame 16 is formed in a frame shape along the outer periphery of the diffusing plate 10, and the frame 16 and the diffusing plate 10 are arranged at a predetermined interval from each other. Further, the frame 16 is formed integrally with the housing 90 shown in FIG.

  The rubber material 14 is attached along the outer periphery of the diffusion plate 10, and the diffusion plate 10 is attached to the inner peripheral side of the frame 16 through the rubber material 14. At this time, as shown in FIG. 3B, the rubber material 14 is provided between the diffusion plate 10 and the frame 16 with play (bent), and the diffusion plate 10 is formed by the rubber material 14. Elastically supported. Thereby, when disturbance vibration is applied to the diffusion plate 10, the diffusion plate 10 can vibrate in the direction perpendicular to (crossing) the direction of the diffusion plate 10 (z direction). Here, the disturbance vibration means vibration based on sound output from the speaker of the rear projector 120 or an external environment where the rear projector 120 is disposed, for example, floor vibration, wind vibration, or the like. In addition, when disturbance vibration is applied to the diffusion plate 10, disturbance vibration is applied to the frame 16 and vibration is indirectly transmitted from the frame 16 to the diffusion plate 10, or directly to the surface of the diffusion plate 10. In some cases, disturbance vibration is applied.

  Further, the rubber material 14 provided along the outer periphery of the diffusion plate 10 has substantially the same elastic coefficient on the entire circumference of the rubber material 14. In addition, as a material for attaching the diffusion plate 10 to the frame 16, in addition to the rubber material 14, a stretchable elastic member may be used, or a support member made of a non-elastic member such as a wire may be used.

4A to 4D are diagrams illustrating the operation of the diffusion plate 10 when disturbance vibration is applied to the screen 20.
First, when the power of the projector is turned on, disturbance vibration is generated by, for example, sound output from the speaker of the rear projector 120. This disturbance vibration is transmitted through the housing 90 to the diffusion plate 10 of the screen 20. When disturbance vibration is transmitted to the diffusion plate 10 of the screen 20 having the above-described configuration, the diffusion plate 10 of the screen body 12 is diffused as shown in FIGS. 4 (a) to 4 (d). Reciprocally vibrates in the direction (z direction) perpendicular to the 10 plane. Note that the vibration direction of the diffusion plate 10 may be changed to a direction intersecting the surface of the diffusion plate 10 (a direction other than vertical) by changing the elastic modulus of the rubber material 14 for each side of the diffusion plate 10. Is possible.

According to the present embodiment, since the diffusion plate 10 is attached to the frame 16 so as to be able to vibrate, when disturbance vibration is applied to the screen, the diffusion plate 10 vibrates passively in a direction intersecting the surface of the diffusion plate 10. . Thereby, the diffusion state of the light passing through the diffusion plate 10 of the screen body 12 changes, and accordingly, the pattern of interference fringes generated by the diffusion and diffraction of the diffusion plate 10 of the screen body 12 changes. Accordingly, the interference fringes are integrated and averaged, and scintillation can be reduced.
Further, since disturbance vibration is used for vibration of the diffusion plate 10 and vibration generation means such as light and electric field is not used, scintillation can be reduced without requiring extra driving energy.

  Further, according to the present embodiment, since the diffusion plate 10 is attached to the frame 16 via the rubber material 14, when the disturbance vibration is transmitted to the rubber material 14, the diffusion plate 10 is caused by the elastic force of the rubber material 14. Again repelled. Therefore, in addition to disturbance vibration, the diffusion plate 10 is urged by the rubber material 14 and vibrates. Thereby, the diffusing plate 10 can be vibrated more efficiently.

In the above screen, the single diffusion plate 10 is attached to the frame 16 via the rubber material 14 so as to be vibrated, but the present invention is not limited to this. For example, as shown in FIG. 5, each of the layers 10 and 10 having a diffusion function of two layers (two or more layers) may be attached to the frame 16 via the rubber material 14 so as to be able to vibrate. As the layer having the diffusion function, in addition to the diffusion plate 10, a Fresnel lens 40 or a lenticular lens 42 may be used.
Furthermore, two or more layers having a diffusion function may be attached to the frame 16, and only one of them may be attached to the frame 16 via the rubber material 14 so as to be capable of vibrating.

[Second Embodiment]
Next, the present embodiment will be described with reference to the drawings.
In the above embodiment, the diffusion plate is attached to the frame with a rubber material. On the other hand, the present embodiment is different in that a flexible diffusion plate is attached to the frame in a stretched state. 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. 6A is a perspective view showing a schematic configuration of the screen, and FIG. 6B is a cross-sectional view taken along line B-B ′ of the screen shown in FIG.

  As shown in FIGS. 6A and 6B, the screen 20 includes a screen body 12 and a frame 16 that supports the screen body 12. The screen body 12 includes the diffusion plate 10 having the above-described rigidity and a flexible film-like diffusion sheet 22 having flexibility.

  As shown in FIGS. 6A and 6B, a rigid diffusion plate 10 is attached to the back side surface 16b of the frame 16 with an adhesive. On the other hand, a flexible diffusion sheet 22 is attached to the viewer side surface 16a of the frame 16 with an adhesive, and the peripheral portion of the diffusion sheet 22 extends from the viewer side surface 16a of the frame to the top surface. 16c and the lower surface 16d are bent and pasted. At this time, the diffusion sheet 22 is affixed in a state where a uniform tension is applied to the outer side of the frame 16. More specifically, the diffusion sheet 22 at a position corresponding to the side of the frame 16 is attached to the frame 16 with a low tension, and the diffusion sheet 22 at a position corresponding to the corner portion of the frame 16 has a high tension. Affixed to the frame 16. As a result, when disturbance vibration is applied to the diffusion plate 10, the diffusion plate 10 can vibrate in a direction perpendicular to the surface of the diffusion plate 10 (z direction). Note that a control unit that uniformly adjusts the tension of the diffusion sheet 22 may be provided.

  In addition, as shown in FIG. 6B, the diffusion plate 10 and the diffusion sheet 22 are spaced apart via the frame 16. A space H surrounded by the frame 16 is sealed by a diffusion plate 10 attached to the back side of the frame 16 and a diffusion sheet 22 attached to the viewer side of the frame 16.

  In the above embodiment, the diffusion plate 10 having rigidity is attached to the back side of the frame 16, and the diffusion sheet 22 having flexibility is attached to the viewer side of the frame 16. On the other hand, it is also preferable that the rigid diffusion plate 10 is attached to the viewer side of the frame 16 and the flexible diffusion sheet 22 is attached to the back side of the frame 16.

  According to the present embodiment, since the diffusion sheet 22 is attached to the frame 16 in a stretched state, when disturbance vibration is applied to the diffusion sheet 22, the diffusion sheet 22 is in a direction orthogonal to the surface of the diffusion sheet 22. Vibrates in (z direction). Accordingly, the diffusion state of the light passing through the diffusion sheet 22 and the diffusion plate 10 of the screen body 12 changes, and accordingly, the interference fringes generated by the diffusion and diffraction of the diffusion sheet 22 and the diffusion plate 10 of the screen body 12. The pattern changes. Thereby, interference fringes are integrated and averaged, and scintillation can be reduced.

  In addition, according to the present embodiment, the space surrounded by the frame 16 is sealed by the diffusion sheet 22 attached to the viewer side of the frame 16 and the diffusion plate 10 attached to the back side of the frame 16. Therefore, when disturbance vibration is applied to the screen 20, a change in atmospheric pressure occurs in the sealed space, and the vibration is transmitted into the space. A part of the transmitted vibration is reflected by the inner peripheral surfaces of the diffusion plate 10, the diffusion sheet 22 and the frame 16, and is absorbed again and by the diffusion sheet 22 to vibrate the diffusion sheet 22. Therefore, the diffusion sheet 22 can be vibrated more efficiently.

According to the present embodiment, since the diffusion sheet 22 is attached to the frame 16 with uniform tension in all directions, the Q value at the resonance frequency is increased. Therefore, when disturbance vibration is applied to the diffusion sheet 22, the diffusion sheet 22 reacts sensitively and resonates. This
The diffusion sheet 22 can be periodically vibrated without the need for driving means.

  Further, according to the present embodiment, by arranging the vibrating diffusion sheet 22 on the viewer side, the diffusion sheet 22 can be vibrated at a position closest to the viewer, so that scintillation can be reduced more effectively. Can do.

Moreover, in the said embodiment, although the diffusion plate 10 which has rigidity, and the diffusion sheet 22 which has flexibility were used, it replaces with this and the diffusion sheet 22 which has flexibility on each of both surfaces of the flame | frame 16, 22 may be pasted.
According to this configuration, the space H surrounded by the frame 16 is sealed by the diffusion layers 22 and 22 having two layers of flexibility. Therefore, when disturbance vibration is applied only to one diffusion sheet 22, the vibration applied to one diffusion sheet 22 is transmitted to the other diffusion sheet 22 through the sealed space H. Then, the other diffusion sheet 22 resonates. Thus, according to this embodiment, a plurality of layers can be vibrated without the need for a driving means. Thereby, since the two diffusion sheets 22 and 22 vibrate relatively, the interference fringes are integrated and averaged, and scintillation can be reduced more effectively.

[Third Embodiment]
Next, the present embodiment will be described with reference to the drawings.
In the first embodiment, the diffusion plate is attached to the frame portion by the elastic member. On the other hand, the present embodiment is different in that a flexible diffusion plate is attached in a state of being stretched on the frame portion. 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. 7A is a perspective view illustrating a schematic configuration of the screen, and FIG. 7B is a cross-sectional view taken along line C-C ′ of the screen illustrated in FIG.

  As shown in FIGS. 7A and 7B, the screen 20 includes a screen body 12 and a frame 16 that supports the screen body 12. The screen body 12 includes the diffusion plate 10 having the above-described rigidity and a film-like diffusion sheet 22 having flexibility.

  A flexible diffusion sheet 22 is attached to the viewer side surface 16a of the frame 16 in a stretched state. At this time, the diffusion sheet 22 is attached in a state where a uniform tension is applied to the outer side of the frame 16. In this embodiment, the diffusion plate 10 or the diffusion sheet 22 is not attached to the back side of the frame 16, and the back side of the frame 16 is open.

  On the viewer side of the flexible diffusion sheet 22, a rigid diffusion plate 10 is disposed with a certain distance D from the diffusion sheet 22. The diffusion plate 10 is attached to the diffusion plate 10 via spacers 26 provided at four corners on the viewer side of the diffusion sheet 22. Thus, by disposing the diffusion sheet 22 and the diffusion plate 10 apart from each other, the disturbance vibration applied to the diffusion sheet 22 is not attenuated by the rigid diffusion plate 10.

  According to this embodiment, the same operation effect as the above-mentioned 2nd embodiment can be produced. That is, since the diffusion sheet 22 is attached in a state of being stretched on the frame 16, when disturbance vibration is applied to the diffusion sheet 22, the diffusion sheet 22 is in a direction (z direction) orthogonal to the surface of the diffusion sheet 22. Vibrate. Therefore, interference fringes are integrated and averaged, and scintillation can be reduced.

  In the present embodiment, the screen 20 has a two-layer structure of the diffusion sheet 22 and the diffusion plate 10, but is not limited to this. For example, when the diffusion function of the diffusion sheet 22 is high, the screen 20 can be configured from one layer of the diffusion sheet 22.

[Fourth Embodiment]
Next, the present embodiment will be described with reference to the drawings.
In the said embodiment, the screen main body was comprised with the diffusion plate and the diffusion sheet. On the other hand, the present embodiment is different in that the screen body is further constituted by a plurality of layers. 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. 8 is a cross-sectional view showing a schematic configuration when the screen body 12 is formed of layers having a plurality of diffusion functions.
As shown in FIG. 8, the screen main body 12 includes a lenticular lens 42 that compresses (condenses) an image in addition to the diffusion plate 10 and the diffusion sheet 22 (not shown) described above, and light projected on the screen 20. And a Fresnel lens 40 that converts the light into parallel light. 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. Further, a hard coat layer 46 is pasted on the surface of the diffusion plate 10 on the viewer side. A black mask 44 is formed in a lattice shape on the viewer-side surface of the lenticular lens 42.
Thus, in the said 1st-3rd embodiment, it is good also as a structure which added the lenticular lens 42 and the Fresnel lens 40 to the diffusion plate 10 and the diffusion sheet 22 of the screen main body 12. FIG.

  According to this embodiment, since the layers 10, 22, 40, 42 having a plurality of diffusion functions are provided, when the diffusion plate 10 or the diffusion sheet 22 vibrates, the layers 10, 22, 40, The position of 42 changes relatively. As a result, the interference fringe pattern changes, so that the interference fringes are integrated by the afterimage effect of the viewer's eyes, compared to the case where the diffusion plate 10 is one layer or two layers of the diffusion plate 10 and the diffusion sheet 22. Averaging can reduce scintillation more efficiently.

[Fifth 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 through 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 attached to the frame 16 via the elastic member 14 so as to vibrate. 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, the screen 20 is not limited to the configuration described in the above embodiment, and may be configured by combining the above-described first embodiment with the second embodiment or the third embodiment.
In the above embodiment, the screen 20 having the above-described configuration is used for the rear projector 120. However, the screen 20 may be used for a screen of a front projection type projector.
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 figure which shows operation | movement of a diffusion plate when disturbance vibration is provided to the screen similarly. It is a schematic block diagram of the modification of a screen similarly. 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 rear projector which concerns on 5th Embodiment. It is a figure for demonstrating scintillation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Diffusion plate (diffusion layer), 12 ... Screen main body, 14 ... Rubber material (support member), 16 ... Frame (frame part), 20 ... Screen, 22 ... Diffusion sheet (diffusion layer), 40 ... Fresnel lens, 42 ... Lenticular lens, 74 ... Screen, 120 ... Rear projector, H ... Space

Claims (11)

A screen body having a diffusion layer;
A frame portion provided through a support member along the outer periphery of the diffusion layer,
The screen, wherein the diffusion layer is attached to the frame portion so as to vibrate in a direction intersecting the surface of the diffusion layer by the support member. The screen body has a plurality of the diffusion layers,
The at least two or more diffusion layers among the plurality of diffusion layers are attached to the frame portion so as to vibrate in a direction intersecting the surface of the diffusion layer via the support member. Item 4. The screen according to Item 1. The screen body has a plurality of the diffusion layers,
The one diffusion layer of the plurality of diffusion layers is attached to the frame portion so as to be able to vibrate in a direction intersecting the surface of the diffusion layer via the support member. As described in the screen.   The screen according to claim 1, wherein the support member is made of an elastic material. A screen body having a diffusion layer having flexibility;
Having a frame portion provided along the outer periphery of the diffusion layer,
The screen is characterized in that the flexible diffusion layer is attached to the frame portion so as to vibrate in a direction intersecting the surface of the diffusion layer. A diffusion layer different from the flexible diffusion layer is attached to the frame portion apart from the flexible diffusion layer;
The screen according to claim 5, wherein a space surrounded by the frame portion is sealed by the diffusion layer attached to the frame portion.   The screen according to claim 6, wherein the different diffusion layers have flexibility.   8. The flexible diffusion layer according to claim 5, wherein the flexible diffusion layer is attached to the frame portion with uniform tension in all directions within the plane of the diffusion layer. As described in the screen.   The screen according to any one of claims 6 to 8, wherein the flexible diffusion layer is disposed on an outer surface side of the screen main body. 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 9, 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 9,
A scanning unit that scans the light emitted from the light source on the screen;
An image display device comprising:

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