JP2014126757A - Screen and image display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen capable of displaying a three-dimensional image while preventing deformation of a background visually recognized through a screen, and an image display system including the screen.SOLUTION: A screen 200 includes: a screen body 250 capable of switching between a scattering state in which incident light is scattered and a transmission state in which incident light is transmitted; and a parallax barrier 260 that is provided on one surface side of the screen body 250 and includes a plurality of transmission portions 261 arranged at an interval in a given direction in a plain view from the one surface side of the screen body 250.

Description

  The present invention relates to a screen and an image display system.

2. Description of the Related Art Conventionally, 3D video display devices that display 3D images using special glasses (stereoscope type glasses, anaglyph type glasses) are known. Recently, as shown in Patent Document 1, an apparatus for displaying a three-dimensional image without using special glasses has been developed.
Patent Document 1 discloses an image display system including a screen and a light projection device that projects light onto the screen. The screen has a configuration in which a convex lens array, a scattering sheet, and a substrate are laminated. Such an image display system is configured to display a three-dimensional image using an integral photography system.

  However, in the configuration of Patent Document 1, since the screen includes a convex lens array, the background viewed through the screen appears distorted. Therefore, for example, when the screen is not used, or when an image is displayed only on a part of the screen and the background can be seen through from other areas, the distorted background is seen through the screen, and the observation is performed. The person who feels uncomfortable

JP 2008-65022 A

  An object of the present invention is to provide a screen that can display a three-dimensional image while preventing distortion of the background visually recognized through the screen, and an image display system including the screen.

Such an object is achieved by the present invention described below.
(1) The screen of the present invention has a screen body capable of switching between a scattering state in which incident light is scattered and a transmission state in which incident light is transmitted;
A parallax barrier provided on one surface side of the screen body and having a plurality of light shielding portions arranged at predetermined intervals in a plan view from the one surface of the screen body. It is characterized by being.
As a result, it is possible to obtain a screen that can display a three-dimensional image while preventing distortion of the background visually recognized through the screen.

(2) In the screen of the present invention, the screen body is divided into a plurality of regions in the plan view of the screen body, and the scattering state and the transmission state can be switched for each region. Is preferred.
Thereby, by making the region where the image is not displayed transparent, it is possible to give an impression that the image appears to float on the background that can be seen through the screen.

(3) In the screen of the present invention, the screen body includes a first alignment film located on the parallax barrier side, a second alignment film disposed opposite to the first alignment film, the first alignment film, and the It is preferable to have a polymer-dispersed liquid crystal layer sandwiched between the second alignment films and having liquid crystal molecules dispersed in the polymer.
Thereby, it is possible to switch between the scattering state and the transmission state with a relatively simple configuration.

(4) In the screen of the present invention, it is preferable that the rubbing directions of the first alignment film and the second alignment film are parallel.
Thus, a clear image can be displayed by using the linearly polarized light that exhibits excellent polarization characteristics and vibrates in a predetermined direction as the image light.
(5) In the screen of the present invention, image light that is linearly polarized light that oscillates in a direction parallel to the rubbing direction of the second alignment film is emitted from the second alignment film side to the screen body. preferable.
Accordingly, the image light is efficiently scattered by the screen, and a clearer image can be displayed.

(6) In the screen according to the aspect of the invention, the light shielding unit blocks linearly polarized light that vibrates in a direction parallel to the rubbing direction of the first alignment film, and vibrates in a direction orthogonal to the rubbing direction of the first alignment film. It is preferable to transmit linearly polarized light.
Thereby, since the background can be visually recognized through the light shielding portion, the background over the screen can be visually recognized more clearly as the entire screen.

(7) The screen of the present invention includes a transflective screen body that simultaneously includes a scattering state in which incident light is scattered and a transmission state in which incident light is transmitted;
A parallax barrier provided on one surface side of the screen and having a plurality of light shielding portions arranged at predetermined intervals in a plan view from the one surface of the screen main body. It is characterized by that.
As a result, it is possible to obtain a screen that can display a three-dimensional image while preventing distortion of the background visually recognized through the screen.

(8) The image display system of the present invention is sandwiched between the first alignment film, the second alignment film disposed opposite to the first alignment film, the first alignment film and the second alignment film, A polymer dispersed liquid crystal layer in which liquid crystal molecules are dispersed in a polymer, and light incident on the polymer dispersed liquid crystal layer is scattered by controlling an electric field acting on the polymer dispersed liquid crystal layer. A screen body capable of switching between a scattering state to be transmitted and a transmission state in which light incident on the polymer-dispersed liquid crystal layer is transmitted;
A parallax barrier provided on the first alignment film side of the screen body, and having a plurality of light-shielding portions arranged at intervals in a predetermined direction in a plan view of the screen body;
An optical projection device that emits image light that is linearly polarized light that vibrates in a direction parallel to the rubbing direction of the second alignment film from the second alignment film side toward the screen body. Features.
Thereby, an image display system capable of displaying a three-dimensional image while preventing distortion of the background visually recognized through the screen is obtained.
(9) In the image display system of the present invention, it is preferable that the image displayed on the screen by the video light is a parallax image.
Thereby, a three-dimensional image can be displayed.

1 is a configuration diagram of an image display system according to a first embodiment of the present invention. It is sectional drawing (AA sectional view taken on the line in FIG. 1) of the screen main body contained in the screen shown in FIG. It is sectional drawing which shows the voltage application state of the screen main body shown in FIG. 3A and 3B are cross-sectional views showing polarized light passing through the inside of the screen body shown in FIG. 2, wherein FIG. 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3A and 3B are cross-sectional views showing polarized light passing through the inside of the screen body shown in FIG. 2, wherein FIG. 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. It is a graph which shows the screen transmittance | permeability of the linearly polarized light from which a polarization direction differs. It is a figure which shows the parallax barrier contained in the screen shown in FIG. It is a top view which shows the structure of the optical system of the projector shown in FIG. It is a top view which shows the vibration direction of the image light irradiated to a screen main body. It is sectional drawing (the figure corresponding to the AA line cross section in FIG. 1) of the screen main body contained in the screen with which the image display system concerning 2nd Embodiment of this invention is provided. It is a figure explaining one usage example of the image display system concerning 2nd Embodiment of this invention. It is a block diagram of the image display system concerning 3rd Embodiment of this invention. FIG. 13 is a cross-sectional view of a screen main body included in the screen included in the image display system shown in FIG. It is a block diagram of the image display system concerning 4th Embodiment of this invention. It is a top view which shows the structure of the optical system of the projector with which the image display system concerning 5th Embodiment of this invention is provided. It is a top view which shows the structure of the optical system of the projector with which the image display system concerning 6th Embodiment of this invention is provided. It is a top view which shows the structure of the optical system of the projector with which the image display system concerning 7th Embodiment of this invention is provided.

Hereinafter, the screen and image display system of the present invention will be described in detail based on preferred embodiments shown in the drawings.
<First Embodiment>
FIG. 1 is a configuration diagram of an image display system according to the first embodiment of the present invention. 2 is a cross-sectional view of the screen body included in the screen shown in FIG. 1 (cross-sectional view taken along line AA in FIG. 1). 3 is a cross-sectional view showing a voltage application state of the screen body shown in FIG. 4 and 5 are cross-sectional views showing polarized light passing through the inside of the screen body shown in FIG. 2, wherein (a) is a cross-sectional view taken along line AA in FIG. 1, and (b) is in FIG. It is a BB sectional view. FIG. 6 is a graph showing the screen transmittance of linearly polarized light having different polarization directions. FIG. 7 is a diagram showing a parallax barrier included in the screen shown in FIG. FIG. 8 is a plan view showing the configuration of the optical system of the projector shown in FIG. FIG. 9 is a plan view showing the vibration direction of image light applied to the screen body. In the following, for convenience of explanation, the vertical direction of the drawing in FIG. 1 is also referred to as a vertical direction, and the direction orthogonal to the vertical direction is also referred to as a horizontal direction.

  An image display system 100 illustrated in FIG. 1 includes a screen 200, a light projection device 900 that projects video light L ′ on the screen 200, and a control unit 400 that controls driving of the screen 200 and the light projection device 900. Yes. Such an image display system 100 is a system that projects the image light L ′ from the light projection device 900 onto the back surface of the screen 200 and displays a desired three-dimensional image on the screen 200.

Hereinafter, the screen 200, the light projection device 900, and the control unit 400 will be sequentially described in detail.
≪Screen≫
As shown in FIG. 1, the screen 200 includes a screen main body 250 and a parallax barrier (parallax barrier) 260 positioned on the front side of the screen main body 250.

(Screen body)
As shown in FIG. 2, the screen body 250 includes a pair of transparent substrates 211 and 212, a pair of electrodes 221 and 222, a pair of alignment films 231 and 232, and a polymer dispersed liquid crystal layer 240. Yes.
Of the pair of transparent substrates 211 and 212, the transparent substrate 211 is disposed on the front side of the screen 200, and the transparent substrate 212 is disposed on the back side of the screen 200. The transparent substrate 211 supports the electrode 221 and the alignment film 231, and the transparent substrate 212 supports the electrode 222 and the alignment film 232.

  The constituent materials of the transparent substrates 211 and 212 are not particularly limited, and examples thereof include glass materials such as quartz glass and plastic materials such as polyethylene terephthalate. Among these, it is particularly preferable that it is made of a glass material such as quartz glass. As a result, it is possible to obtain a screen 200 that is less likely to warp, bend, or the like and that is more stable.

Of the pair of electrodes 221, 222, the electrode 221 is disposed on the inner surface (on the polymer dispersed liquid crystal layer 240 side) of the transparent substrate 211, and the electrode 222 is disposed on the inner surface (polymer dispersed liquid crystal layer) of the transparent substrate 212. 240 side). The electrodes 221 and 222 are substantially transparent and light transmissive, respectively. These electrodes 221 and 222 are made of, for example, indium tin oxide (ITO), indium oxide (IO), tin oxide (SnO ₂ ), or the like.

  Of the pair of alignment films 231 and 232, the alignment film (first alignment film) 231 is disposed on the inner surface (the polymer dispersed liquid crystal layer 240 side) of the electrode 221, and the alignment film (second alignment film) 232. Is disposed on the inner surface of the electrode 222 (on the polymer dispersed liquid crystal layer 240 side). The pair of alignment films 231 and 232 are arranged so that the rubbing directions A and B are aligned (parallel). The rubbing directions A and B are along the horizontal direction. These alignment films 231 and 232 are obtained by, for example, performing an alignment process such as a rubbing process on a film made of polyimide, polyvinyl alcohol, or the like.

  The polymer-dispersed liquid crystal layer 240 can be switched between a light-transmitting transmission state (transparent state) and a light-scattering scattering state by the strength of the applied electric field. As shown in FIG. 2, such a polymer dispersed liquid crystal layer 240 is composed of a PDLC (polymer dispersed liquid crystal) 241. The PDLC 241 includes a polymer 242 and liquid crystal molecules 243 dispersed in the polymer 242.

  The polymer 242 and the liquid crystal molecules 243 are different substances. The polymer 242 and the liquid crystal molecules 243 have a longitudinal shape having a major axis direction and a minor axis direction. The liquid crystal molecules 243 are aligned while having a predetermined tilt angle along the rubbing direction between the alignment films 231 and 232 in a voltage non-application state where no voltage is applied between the pair of transparent electrodes 221 and 222. doing. Since the rubbing directions A and B of the alignment films 231 and 232 are aligned, the twist angle of the liquid crystal molecules 243 is almost 0 °. As described above, the rubbing directions A and B coincide with each other, so that the polymer dispersed liquid crystal layer 240 exhibits excellent polarization characteristics and efficiently converts linearly polarized light that vibrates in a predetermined direction, as will be described later. Can be scattered.

  Such a PDLC 241 can be formed by, for example, a mixture of a polymer precursor such as a liquid crystalline monomer and liquid crystal molecules. Specifically, the liquid crystal monomer is polymerized by irradiating the mixture with energy such as ultraviolet light while the mixture is aligned by the alignment films 231 and 232. Then, the liquid crystalline monomer is polymerized while maintaining the alignment, and becomes a polymer 242 having an alignment regulating force. The liquid crystal molecules 243 are phase-separated from the polymer 242 and are aligned by the alignment regulating force of the polymer 242.

  The liquid crystal molecules 243 may have any refractive index anisotropy and dielectric anisotropy, and can be appropriately selected from known liquid crystal materials. Further, as the liquid crystal molecules 243, the refractive index in the major axis direction is almost equal to the refractive index in the major axis direction of the polymer 242, and the refractive index in the minor axis direction is almost equal to the refractive index in the minor axis direction of the polymer 242. Further, a material whose refractive index in the minor axis direction is sufficiently different from the refractive index in the major axis direction of the polymer 242 is used.

  Such a polymer-dispersed liquid crystal layer 240 is in a transmission state when no voltage is applied between the pair of transparent electrodes 221 and 222, and a voltage is applied between the pair of transparent electrodes 221 and 222. It becomes a scattering state when a voltage is applied. The “electric field non-application state” means not only a state where no voltage is applied between the pair of transparent electrodes 221 and 222 but also the liquid crystal molecules 243 that do not substantially act between the pair of transparent electrodes 221 and 222. This includes a state in which a voltage of a certain level is applied.

More specifically, in the voltage non-applied state, the liquid crystal molecules 243 and the polymer 242 have substantially the same refractive index, and the light incident on the PDLC 241 is emitted without being scattered and enters a transmissive state. On the other hand, in the voltage application state, as shown in FIG. 3, the azimuth angle in the major axis direction of the polymer 242 does not change, whereas the azimuth angle in the major axis direction of the liquid crystal molecules 243 changes according to the electric field. As a result, the incident light is scattered due to the difference in refractive index between the polymer 242 and the liquid crystal molecules 243, and a light scattering state is obtained.
The screen body 250 in the scattering state is incident on the polymer dispersed liquid crystal layer 240 from the back side (alignment film 232 side), scatters linearly polarized light L1 that vibrates in a direction parallel to the rubbing direction A, and is orthogonal to the alignment direction A. The linearly polarized light L2 that vibrates in the direction of the light is transmitted.

  More specifically, the light incident on the polymer dispersed liquid crystal layer 240 from the back side passes through the polymer 242 and the liquid crystal molecules 243 alternately. At this time, as shown in FIGS. 4A and 4B, the linearly polarized light L1 passes through the polymer 242 while vibrating in the major axis direction, and passes through the liquid crystal molecules 243 while vibrating in the minor axis direction. As described above, since the refractive index in the minor axis direction of the liquid crystal molecule 243 and the refractive index in the major axis direction of the polymer 242 are different, the linearly polarized light L1 is generated at the interface between the polymer 242 and the liquid crystal molecule 243. Scattered. On the other hand, as shown in FIGS. 5A and 5B, the linearly polarized light L2 passes through the polymer 242 while vibrating in the minor axis direction, and passes through the liquid crystal molecules 243 while vibrating in the minor axis direction. To do. As described above, since the refractive index in the minor axis direction of the polymer 242 and the refractive index in the minor axis direction of the liquid crystal molecules 243 are substantially equal, the linearly polarized light L2 is almost at the interface between the polymer 242 and the liquid crystal molecules 243. It passes through the polymer dispersed liquid crystal layer 240 as it is without being scattered.

FIG. 6 shows an example of the transmittance of the linearly polarized light L1 and L2. In FIG. 6, a reverse type polymer dispersed liquid crystal layer is used, the voltage applied to the polymer dispersed liquid crystal layer is plotted on the horizontal axis, and the transmittance of the polymer dispersed liquid crystal layer is plotted on the vertical axis. . As apparent from FIG. 6, when the applied voltage increases and the azimuth angle of the liquid crystal molecules 243 changes, the linearly polarized light L1 hardly transmits through the polymer dispersed liquid crystal layer 240, and most of the linearly polarized light L1 is polymer dispersed liquid crystal. Scattered in layer 240. On the other hand, the linearly polarized light L2 hardly scatters in the polymer dispersed liquid crystal layer 240 even when the applied voltage increases and the azimuth angle of the liquid crystal molecules 243 changes, and most of the linearly polarized light L2 is transmitted through the polymer dispersed liquid crystal layer 240. doing.
Note that, by setting the thickness of the polymer dispersed liquid crystal layer 240 to 10 μm or more, the scattering of the linearly polarized light L1 as described above can be sufficiently generated. The transmittance of the linearly polarized light L1 is preferably 1% or less.

(Parallax barrier)
As shown in FIG. 1, the parallax barrier 260 is provided on the front surface (display surface) side of the screen body 250 in parallel with the screen body 250. In FIG. 1, the parallax barrier 260 is provided apart from the front surface of the screen main body 250, but the arrangement of the parallax barrier 260 is not limited to this as long as the function can be exhibited. The screen main body 250 may be provided in contact with the front surface.

As shown in FIG. 7, the parallax barrier 260 has a configuration in which a plurality of light shielding portions 261 extending in the vertical direction are arranged at predetermined intervals in the horizontal direction (predetermined direction). That is, the parallax barrier 260 has a configuration in which light shielding portions 261 and openings 262 extending in the vertical direction are alternately arranged in the horizontal direction at a predetermined cycle.
In addition, each of the plurality of light shielding units 261 has polarization dependency. Specifically, each of the plurality of light shielding units 261 absorbs linearly polarized light that vibrates in a direction (horizontal direction) parallel to the vibration direction of the image light L ′ and is orthogonal to the vibration direction of the image light L ′ ( It has the property of transmitting linearly polarized light that vibrates in the vertical direction. For example, each of the light shielding portions 261 is configured by a known polarizer such as a wire grid array, so that the above properties can be easily and reliably provided.

Such a screen 200 can display a three-dimensional image (stereoscopic image) using right and left parallax. Specifically, as shown in FIG. 7, the screen body 250, are alternately arranged at a predetermined period to the right-eye pixel regions P _R and the left eye pixel region P _L and the horizontal direction extending in mutually perpendicular directions . The right-eye pixel regions P _R, a pixel area to be viewed by the right eye through the opening 262 of the viewer of the parallax barrier 260, and the left-eye pixel region P _L, the opening 262 of the parallax barrier 260 This is a pixel region that is visually recognized by the left eye of the observer. Then, by projecting the image light L 'to be described later from the rear side of the screen main body 250, to display the image for the right eye to the right eye pixel regions P _R, and displays the image for the left eye in the left-eye pixel regions P _L. That is, a parallax image is displayed on the screen body 250. Right eye pixel regions P _R on the displayed image is not presented to the right eye of the observer by being blocked by the light blocking section 261, likewise, the image is displayed in the left-eye pixel regions P _L, the light shielding portion By being shielded from light by H.261, it is not presented to the left eye of the observer. Therefore, it is possible to present separate images for the left and right eyes, thereby generating binocular parallax and displaying a three-dimensional image. It is not necessary three-dimensional image, if the user wants to display a normal two-dimensional image, it is sufficient to display the same image and the right-eye pixel regions P _R and the left eye pixel regions P _L.

  The screen 200 has been described above. According to such a screen 200, when the screen 200 is not used, the screen 200 can be made transparent by setting the polymer dispersed liquid crystal layer 240 in a transmissive state. Therefore, for example, when the screen 200 is used in a living space, the feeling of pressure given by the screen 200 can be reduced. Further, the screen 200 has a parallax barrier to enable display of a three-dimensional image. Therefore, the background seen through the screen 200 in the transparent state can be visually recognized without being distorted, and the screen 200 can be provided with no sense of incongruity in the living space. In particular, as described above, since the light shielding part 261 of the parallax barrier 260 has a property of transmitting linearly polarized light that vibrates in the vertical direction, the background over the light shielding part 261 is used using this linearly polarized light. Can also be visually recognized. Therefore, since the background can be visually recognized on the entire surface of the screen 200, a clearer background can be visually recognized, and the screen 200 is more comfortable in the living space.

  Further, as described above, the screen 200 transmits linearly polarized light that vibrates in a direction (vertical direction) perpendicular to the rubbing directions A and B even in the scattering state. Therefore, for example, when an image is generated only on a part of the screen main body 250, the background is visually recognized through the screen 200 around the image, so that the image is projected to the viewer as if in the background. It is possible to give a sense of being displayed.

≪Light projection device≫
As shown in FIG. 8, the light projection device 900 includes a projector 600 that emits image light L, and a polarization control element 800 that performs polarization control of the image light L emitted from the projector 600.
The projector 600 includes a light source device 620, a uniform illumination optical system 630, a spatial light modulator 640, and a projection optical system (projection lens group) 650. Such a projector 600 forms a light image (that is, video light L) by modulating the intensity of light emitted from the light source device 620 by the spatial light modulation device 640 according to the given image information, and this light. This is an optical apparatus for enlarging and projecting an image on the screen 200 from the projection optical system 650.

The light source device 620 includes an ultra-high pressure mercury lamp 621 that is a light source and a reflector 622. In such a configuration, the light emitted from the extra-high pressure mercury lamp 621 is reflected by the reflector 622 and converged to the front side. In addition, as a light source, you may employ | adopt not only an ultrahigh pressure mercury lamp but a metal halide lamp etc., for example.
The uniform illumination optical system 630 includes a rod integrator 631, a color wheel 632, a relay lens group 633, and a reflection mirror 634. In such a uniform illumination optical system 630, the light beam emitted from the light source device 620 passes through the color wheel 632 and then enters the rod integrator 631 at an angle.

  The color wheel 632 is rotatably provided by a driving source such as a motor (not shown). Further, the color wheel 632 is formed with a filter surface 632a facing a port formed at the incident side end of the rod integrator 631, and the filter surface 632a has R (red), G (green), B (blue) three-color filters are formed side by side in the circumferential direction across an area. The color wheel 632 may be provided on the emission side of the rod integrator 631.

  The light beam incident on the color wheel 632 is color-separated in time series into three colors of red (R) light, green (G) light, and blue (B) light by the filter surface 632a. The separation into the three colors R, G, and B is performed at a frequency faster than the frame frequency of the image displayed on the screen 200. By performing color separation at such a frequency, a full color image can be displayed on the screen 200.

The light (R light, G light, B light) that has passed through the color wheel 632 is introduced into the inside of the incident port of the rod integrator 631. The light introduced into the rod integrator 631 is reflected a plurality of times in the rod integrator 631, thereby ensuring a uniform illuminance on the exit surface of the rod integrator 631. Therefore, the light emitted from the emission port of the rod integrator 631 has a uniform illumination distribution.
The light emitted from the rod integrator 631 enters the spatial light modulator 640 as uniform illumination light via the relay lens group 633 and the reflection mirror 634.

  The spatial light modulation device 640 includes a substrate 641 and a plurality of light modulation elements 642 arranged on the substrate 641 (for example, DMD (Digital Micromirror Device: “DMD” is manufactured by Texas Instruments Incorporated). The plurality of light modulation elements 642 are arranged in a matrix on the substrate 641. The number of the light modulation elements 642 is not particularly limited, and the projector 600 has one light modulation. Since the element 642 constitutes one pixel, the light modulation elements 642 are arranged by the number of pixels, for example, horizontal × vertical = 1280 × 1024, 640 × 480.

Each light modulation element 642 has a movable mirror for reflecting an incident light beam, and this movable mirror has an ON state in which the reflected light is guided to the projection optical system 650 and an inclination with respect to the ON state. In contrast, the posture changes to an OFF state in which the reflected light is guided to an absorber (not shown).
The spatial light modulator 640 forms a predetermined light image by independently switching the ON / OFF state of each light modulation element 642 based on image information given from, for example, a PC (personal computer) 500 or the like. . The formed optical image is incident on the projection optical system 650. The projection optical system 650 includes a projection lens 651, and projects the light image guided to the projection optical system 650 as video light L in the direction of the screen 200.

  The polarization control element 800 positioned in front of the projection optical system 650 (on the optical path of the image light L) is an image light L ′ composed of linearly polarized light that vibrates in a predetermined direction from the image light L that is random polarization emitted from the projector 600. Is a polarizer. Such a polarization control element 800 is not particularly limited as long as the above effect can be exhibited, and for example, a known polarizer such as a wire grid array or a liquid crystal device can be used.

  The optical projection device 900 has been described above. By adopting such a configuration for the optical projection device 900, the configuration of the optical projection device 900 can be simplified. Further, in the optical projection device 900, the polarization control element 800 is located downstream of the projection optical system 650 in the traveling direction of the image light L. In other words, the polarization control element 800 is provided separately from the projector 600 and is disposed between the projector 600 and the screen 200. With such a configuration, the orientation of the polarization control element 800 with respect to the screen 200 can be maintained in a predetermined orientation regardless of the orientation of the projector 600. Therefore, the polarization control element 800 can always obtain the image light L ′ that is linearly polarized light that vibrates in a desired direction.

  As shown in FIG. 9, in the image display system 100, the vibration direction C of the image light L ′ is parallel to the rubbing direction B. As described above, the polymer-dispersed liquid crystal layer 240 in a voltage applied state has a high scattering property with respect to the linearly polarized light L1 that vibrates in a direction parallel to the rubbing direction B. Since the image light L ′ is also linearly polarized light that vibrates in a direction parallel to the rubbing direction B, the image light L ′ can be efficiently scattered in the polymer dispersed liquid crystal layer 240. In other words, the image light L ′ that passes through the polymer dispersed liquid crystal layer 240 without being scattered can be reduced. For this reason, it is possible to display a brighter (brighter) image and to prevent the occurrence of a remarkable bright spot (a spot that is significantly brighter than the surroundings). As described above, according to the image display system 100, it is possible to display a high-quality video, and further, it is possible to reduce eye strain of the observer by suppressing the bright spots.

  The “parallel” includes not only the case where the rubbing direction B and the vibration direction C of the image light L ′ are parallel, but also the case where the vibration direction C is slightly inclined with respect to the rubbing direction B. . Specifically, a case where the angle formed by the rubbing direction B and the vibration direction C is 10 ° or less in a plan view of the screen 200 is included. If it is in such a range, a sufficient effect can be exhibited.

(Control part)
As shown in FIG. 1, for example, the control unit 400 performs predetermined processing on the image signal I from the personal computer 500 and transmits the image signal I ′ obtained by the processing to the projector 600. And a screen control unit 420 that controls driving (ON / OFF) of the screen 200 based on a signal from the personal computer 500. Upon receiving the image signal from the image signal processing unit 410, the projector 600 emits the image light L based on the image signal, and the light that has passed through the polarization control element 800 and becomes the image light L ′ is the screen body from the back side. 250.

  The control unit 400 is configured to control the drive of the screen 200 (screen body 250) by the screen control unit 420 in response to the output of the image signal I ′ from the image signal processing unit 410 to the projector 600. . Specifically, in a state where the image signal I ′ is not output from the image signal processing unit 410, the control unit 400 causes the screen main body 250 to be in a transmissive state by the screen control unit 420. On the other hand, in the state where the image signal I ′ is output from the image signal processing unit 410, the control unit 400 causes the screen main body 250 to be in a scattering state by the screen control unit 420.

According to such a control unit 400, when the image light L ′ transmitted through the polarization control element 800 is not emitted from the light projection device 900, that is, when there is no image to be displayed on the screen body 250, the screen body 250 is moved. It can be in a transmissive state. Further, when the image light L ′ transmitted through the polarization control element 800 is emitted from the light projection device 900, the screen body 250 can be in a scattering state, and the screen 2 body 250 corresponds to the image light L ′. An image can be displayed.
The image display system 100 according to the present embodiment has been described above.

  In this embodiment, the light shielding unit 261 has a property of transmitting linearly polarized light that vibrates in the vertical direction, but the light shielding unit 261 has a property of absorbing linearly polarized light that vibrates in the vertical direction. Also good. That is, the light shielding unit 261 has a property of absorbing both linearly polarized light that vibrates in the horizontal direction (the same vibration direction as that of the image light L ′) and linearly polarized light that vibrates in the vertical direction (the direction orthogonal to the image light L ′). You may do it.

Second Embodiment
Next, a second embodiment of the image display system of the present invention will be described.
FIG. 10 is a cross-sectional view of the screen body included in the screen included in the image display system according to the second embodiment of the present invention (a view corresponding to the cross section along line AA in FIG. 1). FIG. 11 is a diagram for explaining one usage example of the image display system according to the second embodiment of the present invention.

Hereinafter, the image display system according to the second embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.
The image display system according to the second embodiment of the present invention is the same as that of the first embodiment described above except that the configuration of the screen body is different. In addition, the same code | symbol is attached | subjected to the structure similar to embodiment mentioned above.

  As shown in FIG. 10, in the screen main body 250A of the present embodiment, the electrode 222 is divided into a plurality of electrode pieces 222 '. The plurality of electrode pieces 222 ′ are arranged in a matrix and are connected to a circuit (not shown) formed on the transparent substrate 212. The circuit includes TFTs (switching elements) arranged in a matrix, gate lines and data lines formed corresponding to the TFTs, gate drivers for applying desired voltages to the gate lines, and applying desired voltages to the data lines. A data driver or the like is provided, and voltage application for each electrode piece 222 ′ can be controlled independently. Hereinafter, for convenience of explanation, a region where one electrode piece 222 ′ overlaps with the electrode 221 is also referred to as “unit pixel region S <b> 1”.

  The control unit 400 (screen control unit 420) can select the scattering state / transmission state independently for each of the plurality of unit pixel regions S1. Therefore, in synchronization with the image signal I, only the unit pixel region S1 irradiated with the video light L ′ is set in the scattering state, and the unit pixel region S1 not irradiated with the video light L ′ is set in the transmission state. The background is visually recognized through the screen 200A from the immediate surroundings of the outline of the image. Therefore, it is possible to give the viewer a feeling as if the image is projected and displayed in the background.

As an example of using such an image display system 100A, an example in which the image display system 100A is applied to a show window will be described below. As shown in FIG. 11, a screen 200A is installed in front of a product 1000 displayed in a show window, and an optical projection device 900 is installed on the ceiling. If the image display system 100A is not driven, the screen 200A is substantially colorless and transparent, so that shoppers, pedestrians, etc. can see the product 1000 through the screen 200A. In this regard, it is no different from viewing the product 1000 through the glass as in the past. On the other hand, when the image display system 100A is driven and a parallax image is displayed on the screen 200A so that the image can be seen on the side of the product 1000, the shoppers, pedestrians, etc. While viewing the product 1000 through the unit pixel region S1) that is in a transparent state, the three-dimensional image displayed on the side can be seen. By placing various types of information such as the size, material, and price of the product 1000 as this image, it is possible to convey information about the product 1000 to pedestrians. By transmitting information as a three-dimensional image, the information is transmitted with a strong impact to shoppers, pedestrians, etc., as compared with the conventional method of placing a plate with information about the product 1000 next to the product 1000. Therefore, it is possible to contribute to increase purchase motivation. Such usage examples can also be applied to the first embodiment described above and the embodiments described later.
Also according to the second embodiment, the same effects as those of the first embodiment described above can be obtained.

<Third Embodiment>
Next, a third embodiment of the image display system of the present invention will be described.
FIG. 12 is a configuration diagram of an image display system according to the third embodiment of the present invention. FIG. 13 is a cross-sectional view of the screen body included in the screen included in the image display system shown in FIG. 12 (a view corresponding to the cross section taken along the line CC in FIG. 12).

Hereinafter, the image display system according to the third embodiment will be described focusing on the differences from the above-described embodiment, and description of similar matters will be omitted.
The image display system according to the third embodiment of the present invention is the same as the first embodiment described above except that the configuration of the light projection device and the configuration of the screen body are different. In addition, the same code | symbol is attached | subjected to the structure similar to embodiment mentioned above.

  As shown in FIG. 12, the light projection device 900 </ b> B of the present embodiment is configured with a projector 600. That is, the light projection device 900B has a configuration in which the polarization control element 800 is omitted from the light projection device 900 of the first embodiment described above. Thereby, the number of parts of the light projection device 900B can be reduced, and the cost can be reduced. Image light L ′ that is randomly polarized light is emitted from such an optical projection device 900B.

  As shown in FIG. 13, in the screen main body 250B included in the screen 200B of the present embodiment, the rubbing directions A and B of the alignment films 231 and 232 are twisted by 90 °. Corresponding to this, the long axis direction of the liquid crystal molecules 243 is continuously twisted by 90 °. That is, the polymer dispersed liquid crystal layer 240 is a twisted nematic liquid crystal layer. By configuring the polymer dispersed liquid crystal layer 240 to be twisted nematic, the configuration of the screen body 250B is simplified.

According to the third embodiment as described above, the same effects as those of the first embodiment described above can be obtained.
In the screen body 250B, the twist angle of the liquid crystal molecules 243 is set to 90 °. However, the twist angle of the liquid crystal molecules 243 is not limited to 90 °, and may be 180 °, 270 °, 360 °, or the like. There may be. Further, the screen body 250 of the first embodiment described above may be used instead of the screen body 250B.

<Fourth embodiment>
Next, a fourth embodiment of the image display system of the present invention will be described.
FIG. 14 is a configuration diagram of an image display system according to the fourth embodiment of the present invention.
Hereinafter, the image display system according to the fourth embodiment will be described focusing on the differences from the above-described embodiment, and description of similar matters will be omitted.
The image display system according to the fourth embodiment of the present invention is the same as the first embodiment described above except that the configuration of the screen body is different. In addition, the same code | symbol is attached | subjected to the structure similar to embodiment mentioned above.

  As shown in FIG. 14, the light projection device 900 </ b> C of the present embodiment is configured with a projector 600. That is, the light projection device 900C has a configuration in which the polarization control element 800 is omitted from the light projection device 900 of the first embodiment described above. Thereby, the number of parts of the optical projection device 900C can be reduced, and the cost can be reduced. From such an optical projection device 900C, image light L ′ that is randomly polarized light is emitted.

  Further, the screen main body 250C included in the screen 200C of the present embodiment has a transflective configuration that simultaneously includes a scattering state in which incident light is scattered and a transmission state in which incident light is transmitted. By using such a screen main body 250C, the image light L ′ incident on the screen main body 250C is scattered in the screen main body 250C, so that a parallax image can be displayed on the screen 200C. In addition, when the image is not displayed or when the image is displayed on a part of the screen 200C, the background can be visually recognized through the screen 200C. Here, the light transmittance of the screen body 250C is not particularly limited, but is preferably about 20 to 50%. By setting this numerical value range, a clear image can be displayed on the screen 200C, and the background over the screen 200C can be sufficiently visually recognized.

The configuration of the screen main body 250C is not particularly limited as long as it is a transflective configuration. For example, the screen main body 250C is made of a surface of a transparent substrate, such as frosted glass, or a plastic or the like. In addition, a material in which fine bubbles are dispersed in a transparent substrate can be used. By adopting such a configuration, the configuration of the screen body 250C is simplified.
According to the fourth embodiment as described above, the same effects as those of the first embodiment described above can be obtained.

  As the screen main body 250C, a screen body that can switch between a semi-transmissive state and a transmissive state may be used. Thereby, when the image is not displayed, the screen main body 250C can be made substantially colorless and transparent. Therefore, when used in a living space, the feeling of pressure given by the screen 200C can be reduced. As such a screen main body 250C, for example, a light control glass capable of changing the light transmittance by applying an external signal such as electricity, heat, and light can be used. Further, if this light control glass is divided into a plurality of regions so that the light transmittance can be changed for each region, the method of use as in the second embodiment described above is also possible.

<Fifth Embodiment>
Next, a fifth embodiment of the image display system of the present invention will be described.
FIG. 15 is a plan view showing a configuration of an optical system of a projector included in the image display system according to the fifth embodiment of the present invention.
Hereinafter, the image display system according to the fifth embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.

The image display system according to the fifth embodiment of the present invention is the same as that of the first embodiment described above except that the polarization control element is built in the projector. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.
As shown in FIG. 15, the polarization control element 800 is built in the projector 600. Specifically, the polarization control element 800 is on the optical axis between the spatial light modulator 640 and the projection optical system 650, that is, on the upstream side in the traveling direction of the image light L and the image light L ′ from the projection optical system 650. Is located. As described above, the configuration of the image display system 100 can be simplified by incorporating the polarization control element 800 in the projector 600.
According to the fifth embodiment, the same effect as that of the first embodiment described above can be obtained.

<Sixth Embodiment>
Next, a sixth embodiment of the image display system of the present invention will be described.
FIG. 16 is a plan view showing the configuration of the optical system of the projector provided in the image display system according to the sixth embodiment of the present invention.
Hereinafter, the image display system according to the sixth embodiment will be described with a focus on differences from the above-described embodiments, and description of similar matters will be omitted.
The image display system according to the sixth embodiment of the present invention is the same as that of the first embodiment described above except that the configuration of the light projection device is different. In addition, the same code | symbol is attached | subjected to the structure similar to embodiment mentioned above.

As shown in FIG. 16, a projector 300 that is a light projection device includes an illumination optical system 310, a color separation optical system 320, parallelizing lenses 330R, 330G, and 330B, spatial light modulators 340R, 340G, and 340B, It has a cross dichroic prism 350, a projection optical system (projection lens group) 360, and a polarization rotator 370.
The illumination optical system 310 includes a light source 311, a reflector 312, a first lens array 313, a second lens array 314, a polarization conversion element 315, and a superimposing lens 316.

  The light source 311 is an ultra-high pressure mercury lamp, and the reflector 312 has a parabolic mirror. The radial light beam emitted from the light source 311 is reflected by the reflector 312 to become a substantially parallel light beam, and is emitted to the first lens array 313. The light source 311 is not limited to the ultra-high pressure mercury lamp, and may be a metal halide lamp, for example. Further, the reflector 312 is not limited to a parabolic mirror, and a configuration in which a collimating concave lens is disposed on the exit surface of the reflector 312 formed of an ellipsoidal mirror may be employed.

  The first lens array 313 and the second lens array 314 are formed by arranging small lenses in a matrix. The light beam emitted from the light source 311 is divided into a plurality of minute partial light beams by the first lens array 313, and each partial light beam is divided into three spatial lights to be illuminated by the second lens array 314 and the superimposing lens 316. Superimposed on the surfaces of the modulation devices 340R, 340G, 340B.

The polarization conversion element 315 has a function of aligning a randomly polarized light beam with linearly polarized light (S-polarized light or P-polarized light) that vibrates in one direction. In this embodiment, the loss of the light beam in the color separation optical system 320 is reduced. Aligned with a small amount of S-polarized light.
The color separation optical system 320 has a function of separating the light beam emitted from the illumination optical system 310 into three color lights of red (R) light, green (G) light, and blue (B) light, A B light reflecting dichroic mirror 321, an RG light reflecting dichroic mirror 322, a G light reflecting dichroic mirror 323, and reflecting mirrors 324 and 325 are provided.

  Of the light beam emitted from the illumination optical system 310, the B light component is reflected by the B light reflecting dichroic mirror 321 and further reflected by the reflecting mirrors 324 and 361 to reach the collimating lens 330B. On the other hand, of the light beam emitted from the illumination optical system 310, the components of G light and R light are reflected by the RG light reflecting dichroic mirror 322 and further reflected by the reflecting mirror 325 to reach the G light reflecting dichroic mirror 323. The component of G light therein is reflected by the G light reflecting dichroic mirror 323 and the reflecting mirror 362 and reaches the collimating lens 330G, and the component of R light is transmitted through the G light reflecting dichroic mirror 323 and reflected by the reflecting mirror 363. To the collimating lens 330R.

The collimating lenses 330R, 330G, and 330B are configured so that the partial light beams become substantially parallel light beams so as to illuminate the spatial light modulators 340R, 340G, and 340B, respectively, with a plurality of partial light beams from the illumination optical system 310. Is set to
The R light transmitted through the collimating lens 330R reaches the spatial light modulation device (first spatial light modulation device) 340R, and the G light transmitted through the parallelizing lens 330G is the spatial light modulation device (second spatial light modulation device). The B light reaching 340G and transmitted through the collimating lens 330B reaches the spatial light modulator (third spatial light modulator) 340B.

  The spatial light modulation device 340R is a spatial light modulation device that modulates R light according to an image signal, and is a transmissive liquid crystal display device (LCD). A liquid crystal panel (not shown) provided in the spatial light modulation device 340R encloses a liquid crystal layer for modulating light according to an image signal between two transparent substrates. The R light modulated by the spatial light modulation device 340R enters a cross dichroic prism 350 that is a color synthesis optical system. The configurations and functions of the spatial light modulation devices 340G and 340B are the same as those of the spatial light modulation device 340R.

  The cross dichroic prism 350 is formed into a prismatic shape having a substantially square cross section by bonding four prisms having a triangular prism shape. Dielectric multilayer films 351 and 352 are formed along the X-shaped bonding surface. Is provided. The dielectric multilayer film 351 transmits G light and reflects R light, and the dielectric multilayer film 352 transmits G light and reflects B light. Then, the cross dichroic prism 350 forms the image light representing the color image by combining the modulated lights of the respective color lights emitted from the spatial light modulators 340R, 340G, and 340B from the incident surfaces 350R, 350G, and 350B, respectively. Then, the image light is emitted toward the projection optical system 360.

  A polarization rotator 370 is disposed between the cross dichroic prism 350 and the projection optical system 360. The polarization rotator 370 has wavelength selectivity and functions to rotate the polarization direction of light of a predetermined wavelength by 90 ° (that is, a function to convert S-polarized light to P-polarized light or P-polarized light to S-polarized light). have. The polarization rotator 370 is not particularly limited, and for example, Color Select (registered trademark) manufactured by Coloring Co., Ltd. can be used.

  Since the cross dichroic prism 350 is a single-polarization element that reflects S-polarized light and transmits P-polarized light, the R light and B light reflected by the cross dichroic prism 350 are converted to S-polarized light and G is transmitted through the cross dichroic prism 350. The light needs to be P-polarized light. As described above, since the polarization directions of the R light, B light, and G light emitted from the cross dichroic prism 350 are different, the polarization rotator 370 is arranged to align the polarization directions of the R light, G light, and B light. Has been.

  The polarization rotator 370 is configured to rotate the polarization of the R light and the B light by 90 ° and not to rotate the change of the G light. Therefore, the R light, G light, and B light that have passed through the polarization rotator 370 have the same polarization direction. Here, the G light is a component having a higher relative visibility than the R light and the B light. Therefore, unlike the polarization rotator 370, by aligning the polarization directions of the R light, G light, and B light without rotating the polarization of the G light, the loss of the G light is suppressed, and a bright image display is provided for the observer. It becomes possible.

The image light that has passed through the polarization rotator 370 is emitted from the projection optical system 360 as image light L ′.
According to the projector 600 having such a configuration, since the image light L ′ that is linearly polarized light can be emitted, the polarization control element 800 as in the first embodiment described above becomes unnecessary, and the configuration of the image display system 100. Is simplified.
The sixth embodiment as described above can achieve the same effects as those of the first embodiment described above.

  In the present embodiment, a projector using three transmissive liquid crystal display devices (LCD) has been described, but the configuration of the projector is not limited to this. For example, a configuration using three reflective liquid crystal display (LCD) devices may be used. In addition, a configuration using two liquid crystal display devices may be used regardless of transmission type / reflection type. In other words, the present embodiment can be applied to any projector that uses polarized light and uses two or more microdisplays.

<Seventh embodiment>
Next, a seventh embodiment of the image display system of the present invention will be described.
FIG. 17 is a plan view showing the configuration of the optical system of the projector provided in the image display system according to the seventh embodiment of the present invention.
Hereinafter, the image display system according to the seventh embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.
The image display system according to the seventh embodiment of the present invention is the same as that of the first embodiment described above except that the configuration of the light projection device is different. In addition, the same code | symbol is attached | subjected to the structure similar to embodiment mentioned above.

  As shown in FIG. 17, a projector 700 as an optical projection device has a light source unit 710, a PBS (polarization beam splitter) prism 730, a reflective liquid crystal panel 740, and a projection optical system (projection lens group) 750. doing.

The light source unit 710 includes red, green, and blue laser light sources 711R, 711G, and 711B, collimator lenses 712R, 712G, and 712B provided for the laser light sources 711R, 711G, and 711B and dichroic mirrors 713R, 713G, and 713B. And.
The laser light sources 711R, 711G, and 711B each have a light source and a drive circuit (not shown). The laser light source 711R emits red laser light, the laser light source 711G emits green laser light, and the laser light source 711B emits blue laser light. The laser beams of the respective colors emitted from these laser light sources 711R, 711G, and 711B are linearly polarized light and have the same polarization direction (vibration direction of light) (for example, S wave).

  The laser beams of the respective colors emitted from the laser light sources 711R, 711G, and 711B are collimated by the collimator lenses 712R, 712G, and 712B and enter the dichroic mirrors 713R, 713G, and 713B. The dichroic mirror 713R has a characteristic of reflecting red laser light. The dichroic mirror 713B has characteristics of reflecting blue laser light and transmitting red laser light. The dichroic mirror 713G has characteristics of reflecting green laser light and transmitting red and blue laser lights.

  The driving of the laser light sources 711R, 711G, and 711B is controlled so as to blink sequentially, whereby red laser light, green laser light, and blue laser light are sequentially emitted. The emitted laser light of each color passes through a collimator lens and a dichroic mirror, is reflected by a reflection surface of a PBS (polarization beam splitter) prism 730, and is projected on a reflective liquid crystal panel 740.

  The reflective liquid crystal panel 740 is an LCOS (Liquid Crystal on Silicon) and has a reflective layer. Accordingly, the laser beams of the respective colors reflected by the reflecting layer and passed through the PBS prism 730 are emitted from the projection optical system 750 as the image light L ′. The laser light of each color reflected by the reflective liquid crystal panel 740 has a polarization direction rotated by 90 ° and becomes P-polarized light.

According to the projector 700 having such a configuration, since the image light L ′ that is linearly polarized light can be emitted, the polarization control element 800 as in the first embodiment described above becomes unnecessary, and the configuration of the image display system 100. Is simplified.
According to the seventh embodiment as described above, the same effects as those of the first embodiment described above can be obtained.

In the present embodiment, the single-plate system using one reflective liquid crystal panel 740 is used, but the configuration of the projector 700 is not limited to this. For example, a three-plate system in which a reflective liquid crystal panel is provided for each of red light, green light, and blue light, or a configuration using a transmissive liquid crystal panel instead of the reflective liquid crystal panel may be used. In addition, a projector in which each color light from the light source unit 710 is linearly polarized in advance having only vibration components in the same direction (for example, a polarization control type single-plate projector, a scan in which the polarization direction of each color light is controlled) If it is a projector etc., it will not specifically limit as a structure of a projector.
As described above, the screen and the image display system of the present invention have been described based on the illustrated embodiment. However, the image display system of the present invention is not limited to this, and the configuration of each unit has the same function. Any configuration can be substituted. Moreover, you may combine each embodiment.

  DESCRIPTION OF SYMBOLS 100, 100A ... Image display system 200, 200A, 200B, 200C ... Screen 211, 212 ... Transparent substrate 221, 222 ... Electrode 222 '... Electrode piece 231, 232 ... Orientation film 240 ... Polymer dispersion type liquid crystal layer 241 ... PDLC 242 ... polymer 243 ... liquid crystal molecule 250, 250A, 250B, 250C ... screen body 260 ... parallax barrier 261 ... light shielding part 262 ... opening part 300 ... projector 310 ... illumination optical system 311 ... light source 312 ... reflector 313 ... lens array 314 ... lens Array 315: Polarization conversion element 316 ... Superimposing lens 320 ... Color separation optical system 321 ... B light reflecting dichroic mirror 322 ... RG light reflecting dichroic mirror 323 ... G light reflecting dichroic mirror 324 ... Reflecting mirror 325 ... Reflecting mirror 330B ... Parallelizing lens 330G ... Parallelizing lens 330R ... Parallelizing lens 340B ... Spatial light modulator 340G ... Spatial light modulator 340R ... Spatial light modulator 350 ... Cross dichroic prism 350B ... Incident surface 350G ... Incident surface 350R ... incident surface 351 ... dielectric multilayer film 352 ... dielectric multilayer film 360 ... projection optical system 361 ... reflection mirror 362 ... reflection mirror 363 ... reflection mirror 370 ... polarization rotator 400 ... control unit 410 ... image signal processing unit 420 ... screen Control unit 500 ... Personal computer 600 ... Projector 620 ... Light source device 621 ... Super high pressure mercury lamp 622 ... Reflector 630 ... Uniform illumination optical system 631 ... Rod integrator 632 ... Color wheel 6 2a ... Filter surface 633 ... Relay lens group 634 ... Reflection mirror 640 ... Spatial light modulation device 641 ... Substrate 642 ... Light modulation element 650 ... Projection optical system 651 ... Projection lens 700 ... Projector 710 ... Light source unit 711B, 711G, 711R ... Laser Light source 712B, 712G, 712R ... Collimator lens 713B, 713G, 713R ... Dichroic mirror 730 ... PBS prism 740 ... Reflective liquid crystal panel 750 ... Projection optical system 800 ... Polarization control element 900, 900B, 900C ... Optical projection device 1000 ... Commodity I, I '... Image signal L1, L2 ... Linearly polarized light L, L' ... Video light S1 ... Unit pixel area PR ... Right eye image area PL ... Left eye image area

Claims (9)

A screen body capable of switching between a scattering state in which incident light is scattered and a transmission state in which incident light is transmitted;
A parallax barrier provided on one surface side of the screen body and having a plurality of light shielding portions arranged at predetermined intervals in a plan view from the one surface of the screen body. A screen characterized by being.   The screen according to claim 1, wherein the screen body is divided into a plurality of regions in the plan view of the screen body, and the scattering state and the transmission state can be switched for each region.   The screen body is sandwiched between a first alignment film positioned on the parallax barrier side, a second alignment film disposed opposite to the first alignment film, and the first alignment film and the second alignment film. And a polymer-dispersed liquid crystal layer in which liquid crystal molecules are dispersed in a polymer.   The screen according to claim 2 or 3, wherein the rubbing directions of the first alignment film and the second alignment film are parallel.   5. The screen according to claim 4, wherein image light that is linearly polarized light that oscillates in a direction parallel to a rubbing direction of the second alignment film is emitted from the second alignment film side to the screen body.   6. The light shielding unit according to claim 5, wherein the light shielding unit blocks linearly polarized light that vibrates in a direction parallel to a rubbing direction of the first alignment film, and transmits linearly polarized light that vibrates in a direction orthogonal to the rubbing direction of the first alignment film. Screen described. A transflective screen body having a scattering state where incident light is scattered and a transmission state where incident light is transmitted;
A parallax barrier provided on one surface side of the screen and having a plurality of light shielding portions arranged at predetermined intervals in a plan view from the one surface of the screen main body. A screen characterized by that. A polymer in which liquid crystal molecules are dispersed in a polymer, sandwiched between the first alignment film, a second alignment film disposed opposite to the first alignment film, and the first alignment film and the second alignment film A dispersion type liquid crystal layer, and a scattering state in which light incident on the polymer dispersion type liquid crystal layer is scattered by controlling an electric field acting on the polymer dispersion type liquid crystal layer, and the polymer dispersion type liquid crystal layer A screen body capable of switching between a transmission state through which light incident on the screen is transmitted;
A parallax barrier provided on the first alignment film side of the screen body, and having a plurality of light-shielding portions arranged at intervals in a predetermined direction in a plan view of the screen body;
An optical projection device that emits image light that is linearly polarized light that vibrates in a direction parallel to the rubbing direction of the second alignment film from the second alignment film side toward the screen body. A featured image display system.   The image display system according to claim 8, wherein an image displayed on the screen by the video light is a parallax image.

Images