JP2001083498A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which can display a stereoscopic image, which can be made thin, and in which three or more display screens can be easily formed with a narrow gap between screens. SOLUTION: A display apparatus 11 which displays an image by driving a reverse mode polymer dispersion liquid with a plurality of electrodes is used as a display apparatus which always transmits one polarized component and displays an image with a polarized light component perpendicular to the first polarized component. Two display apparatuses 11 are arranged in the depth direction with the direction of transmitted polarized light perpendicular to each other. Three or more display apparatuses are arranged with the direction of transmitted polarized light of adjacent display apparatuses perpendicular to each other. A light guide plate is disposed on one or both surfaces of the reverse mode polymer dispersion liquid crystal panel. A reverse mode holographic polymer dispersion liquid is used as the reverse mode polymer dispersion liquid. A wavelength plate is disposed on the observer's side of the display device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display device, and more particularly, to a display device capable of expressing a sense of depth.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram of a conventional projector. In the projector 1 shown in FIG. 1, light from a light source 6 is linearly polarized by a polarizing plate and is incident on a twisted nematic liquid crystal panel 2. Then, the image displayed on the twisted nematic liquid crystal panel 2 is formed on the screen 5 via the lens 3 to be displayed on the screen 5.

[0003]

However, in the projector 1 described above, the display on the screen 5 cannot be combined with the object on the back side of the screen 1 or the display on another screen.

Accordingly, the present applicant has previously proposed a display device capable of solving the above-mentioned problems (Japanese Patent Application No. 10-24 / 1990).
1222). Although not shown, the display device proposed here uses a polarization scattering plate having polarization dependency as a screen for projecting and displaying an image by a liquid crystal projector. The polarized light scattering plate referred to here is a scattering plate having a property of transmitting light of a specific linearly polarized light component as it is and scattering light of a polarized light component orthogonal to the specific polarized light component like ground glass.

Therefore, according to this display device, an image is displayed on the polarization scattering plate by emitting light having a polarization component orthogonal to the specific polarization component from the liquid crystal projector and forming an image on the polarization scattering plate. At the same time, of the light from the object on the other side of the polarization scattering plate (the side opposite to the observer), the light of the specific polarization component passes through the polarization scattering plate,
The object can also be seen through the polarization scattering plate. That is, it is possible to perform a display with a sense of depth by combining the display on the polarization scattering plate and the object on the back side of the polarization scattering plate.

In another display device proposed at the same time, although not shown, the first polarization scattering plate and the second polarization scattering plate are arranged in the depth direction so that the polarization directions are different by 90 degrees (the first polarization scattering plate is not shown).
The first and second liquid crystal projectors are arranged behind the second polarization scattering plate, and the projection light of the first liquid crystal projector is arranged behind the second polarization scattering plate. Is configured so that the polarization direction of the first polarization scattering plate coincides with the polarization direction in which the first polarization scattering plate exhibits scattering properties, and the polarization direction of the projection light of the second liquid crystal projector coincides with the polarization direction in which the second polarization scattering plate exhibits the scattering properties. Things.

Therefore, according to this display device, the image of the first liquid crystal projector transmitted through the second polarization scattering plate and projected on the first polarization scattering plate, and the first image projected on the second polarization scattering plate and projected on the second polarization scattering plate.
The image of the second liquid crystal projector passing through the polarization scattering plate can be viewed at the same time. That is, a display with a sense of depth can be performed by combining the display image on the first polarization scattering plate and the display image on the second polarization scattering plate.

However, since this display device uses a liquid crystal projector, a screen (polarized light scattering plate) is used.
Requires a distance to arrange the liquid crystal projector in front of or behind. Therefore, the thickness of the device cannot be reduced.

Further, it is difficult to arrange three or more polarization scattering plates in the depth direction to synthesize three or more display images. That is, since the projection display by the liquid crystal projector is used, when displaying on a plurality of polarization scattering plates, the light is transmitted through another polarization scattering plate between the polarization scattering plate to be displayed and the liquid crystal projector. This is achieved by using light. That is, the polarization scattering plate is selected according to the polarization direction. However, since there are only two types of orthogonal polarization states according to the laws of physics, it is possible to selectively display only up to two polarized light scattering plates in principle. Was difficult to construct.

[0010] Further, if a configuration is adopted in which projection display is performed on the polarized light scattering plate without transmitting through the other polarized light scattering plate, multi-plane display is possible. (Interval) was difficult to achieve.

Accordingly, the present invention has been made in view of such a problem,
A display with a sense of depth can be performed by synthesizing display images, and the apparatus can be made thinner without using a liquid crystal projector. It is an object of the present invention to provide a display device which can be easily configured.

[0012]

Means for Solving the Problems A first method for solving the above problems is described below.
The display device of the present invention uses a display device that transmits one polarization component at all times and displays an image with light having a polarization component orthogonal to the polarization component. The two display devices are arranged such that transmission polarization directions are orthogonal to each other. In addition, it is characterized by being arranged in the depth direction when viewed from the observer.

A display device according to a second aspect of the present invention uses a display device which constantly transmits one polarized light component and displays an image with light having a polarized light component orthogonal to the polarized light component. Are arranged in the depth direction as viewed from the viewer such that the transmission polarization directions of the adjacent display devices are orthogonal to each other.

The display device according to a third aspect of the present invention is the display device according to the first or second aspect, wherein the display device displays an image by driving a reverse mode polymer dispersed liquid crystal with a plurality of electrodes. It is characterized by having been.

A display device according to a fourth aspect of the present invention is the display device according to the third aspect, wherein the display device is provided with a light guide plate in close contact with the reverse mode polymer dispersed liquid crystal panel, and a light source is provided on a side portion of the light guide plate. A light guide plate for guiding light emitted from the light source to the reverse mode polymer dispersed liquid crystal.

A display device according to a fifth aspect of the present invention is the display device according to the fourth aspect, wherein the display device has a configuration in which light guide plates are provided on both sides of a reverse mode polymer dispersed liquid crystal panel.

Further, the display device according to the sixth aspect of the present invention includes the third and fourth display devices.
Alternatively, in the display device according to the fifth aspect, a reverse mode holographic polymer dispersed liquid crystal is used as the reverse mode polymer dispersed liquid crystal.

A display device according to a seventh aspect of the present invention is the display device according to the first, second, third, fourth, fifth, or sixth aspect of the present invention, wherein a wave plate is provided on a surface of the display device on the viewer side. It is characterized by the following.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIG. 1 is a configuration diagram of a display device according to Embodiment 1 of the present invention, FIG. 2 is a configuration diagram of a display device provided in the display device, and FIG. 3 is a reverse view of the display device. FIG. 4 is an explanatory view showing the case where the mode polymer dispersed liquid crystal is driven by the TFT method, and FIG. 4 is an explanatory view showing the operation of the reverse mode polymer dispersed liquid crystal.

<Structure> As shown in FIG. 1, a display device 10 according to the first embodiment constantly transmits one polarization component and displays an image with light having a polarization component orthogonal to the polarization component. As an example, a display 11 that displays an image by driving a reverse mode polymer-dispersed liquid crystal with a plurality of electrodes is used, and the two displays 11 are viewed from an observer 13 so that transmission polarization directions are orthogonal to each other. In the depth direction.

In the illustrated example, the display device 1 on the front side (observer side)
1 displays an image with polarized light 14 parallel to the paper of FIG. 1 and sets so as to transmit polarized light 15 perpendicular to the paper of FIG. 1. Vertical polarization 15
Is set to display an image, and the polarized light 14 parallel to the plane of FIG. 1 is transmitted. Of course, the present invention is not limited to this. If the transmission polarization directions of the front display 11 and the rear display 11 are orthogonal to each other, the absolute transmission polarization direction of the display 11 is arbitrary.

As will be described in detail later, the display 11 can control the scattering and transmission of a specific polarization component by an electric field, and always transmit the other polarization components. Using a reverse mode polymer dispersed liquid crystal realized by dispersing a low molecular liquid crystal in
This is a display device that displays an image by driving this with a plurality of electrodes.

Here, based on FIG. 2 to FIG.
Will be described in detail. As shown in FIG.
It has a structure in which a reverse mode polymer dispersed liquid crystal 25 is sandwiched between a transparent substrate 23 having a transparent electrode 21 and a transparent substrate 24 having a transparent electrode 22. Then, one of the transparent substrates 23 is used as a light guide plate,
A cold cathode tube 28 surrounded by a cover 32 is provided as a light source for illuminating the reverse mode polymer-dispersed liquid crystal 25 on the side of the light emitting device. The configuration is such that the liquid crystal is led to the polymer dispersed liquid crystal 25.

As shown by the solid arrows in FIG. 2, the light ray 29 emitted from the cold cathode tube 28 propagates in the light guide plate 23 while being totally reflected. And a reverse mode polymer dispersed liquid crystal 2
5, when the light beam 29 happens to hit a place where the electric field is applied by the power supply 30 electrically connected to the transparent electrodes 21 and 22 to be in a scattering state (part A in the illustrated example),
The light beam 29 is scattered, and an emission light (display light) 31 as shown by a dotted arrow in FIG. 3 is obtained.

The display 11 can be easily manufactured as follows. That is, as in the case of a normal liquid crystal panel, transparent electrodes 21 and 22 are formed on the transparent substrates 23 and 24 such that they can be driven by a matrix such as a TFT method, and alignment films 26 and 27 are applied thereon. An alignment process such as rabbling is performed. Next, these substrates 23 and 24 are arranged so that the alignment films 26 and 27 face each other.
A mixture of a photopolymerizable liquid crystal such as UCL-002 (Dainippon Ink and Chemicals) and a non-polymerizable liquid crystal such as E-7 (Merck Japan) is sealed in the gaps 6 and 27, and ultraviolet rays are applied thereto. Irradiation produces a reverse mode polymer dispersed liquid crystal 25. Then, a cold cathode tube 28 is attached as a light source to a side portion of the substrate 23 which is a light guide plate. Thus, the display 11 can be manufactured.

The orientation is preferably antiparallel. The anti-parallel alignment is an alignment state realized by sandwiching between rubbing directions of an anti-parallel (anti-parallel) substrate, and the tilt angle between liquid crystal molecules and the substrate surface is uniform regardless of the location. It is known that a defect-free orientation is easily obtained.

The transparent electrodes 21 and 22 are processed so that the reverse mode polymer dispersed liquid crystal 25 can be driven by a matrix such as a TFT method as described above.
In the following, FIG.
A specific description will be given based on FIG. Note that FIG. 3 shows only the configuration on the pixel electrode side, and the illustration is omitted because the opposing electrodes are uniform.

As shown in FIG. 3, the TFT system means that a first substrate 45 provided with a switching element 42 composed of a thin film transistor (TFT) for each pixel electrode 41 and a uniform electrode provided on the entire surface (not shown). The pixel electrode 41 is selected for each row by the address line 43 and the potential of the data line 44 is stored by sandwiching the polymer-dispersed liquid crystal with the second substrate. And display is performed based on the potential difference between the pixel electrode 41 on the first substrate 45 and the uniform electrode on the second substrate.

In FIG. 2, the transparent electrode 22 is the pixel electrode 41, the substrate 24 is the first substrate 45, the transparent electrode 21 is the uniform electrode, and the light guide plate 23 is the second substrate. Each corresponds.

The reverse mode polymer dispersed liquid crystal 25
Is in a scattering state for one polarization component when an electric field is applied, so only the region where the electric field is applied by matrix driving is
When the light source illuminating the reverse mode polymer-dispersed liquid crystal 25 is monochromatic, monochrome display is performed in a scattered state (white) and a transparent state (black). In addition, the light source is set to 3 in synchronization with the display image.
By switching to primary colors, full-color display can be performed.

The scattering characteristic of a film in which birefringent particles are dispersed in a birefringent medium such as the reverse mode polymer dispersed liquid crystal 25 can be explained as follows. The operation of the reverse mode polymer dispersed liquid crystal 25 will be described below with reference to FIG. Further, for the sake of simplicity, it is assumed that the dispersed particles are birefringent particles and the number thereof is one.

When no electric field is applied, the reverse mode polymer-dispersed liquid crystal 25 is transparent without scattering because it is a uniform birefringent thin film having an optical axis aligned in one direction. On the other hand, when the electric field is applied, the birefringent particles 52 having different optic axis directions are present in the birefringent thin film uniformly oriented as shown in FIG.

As shown in FIG. 4, when light generally enters the birefringent medium 51, which is a transparent object, the electric field induces the vibrating dipole 53, but the uniform birefringent medium 51
Since the vibration dipoles 53 are uniformly induced therein, scattering by the individual vibration dipoles 53 does not occur.

Next, as shown in FIG.
Is present, for example, when the ordinary refractive index of the birefringent medium 51 is equal to the ordinary refractive index of the birefringent particles 52,
The refractive index difference occurs between the birefringent medium 51 and the birefringent particles 52 in the direction in the plane of FIG. 4 and does not occur in the direction perpendicular to the plane of FIG.

Here, the vibration dipole 53 similarly induced
In consideration of the above, only the portion of the birefringent particle 52, the vibration dipole 53a (the thin arrow) induced therein is different in size from the periphery as shown in the drawing. That is, when viewed relatively, this is equivalent to the presence of the vibrating dipole 54 (dashed thick arrow) corresponding to the refractive index difference at the position where the particle exists. The scattering cross section of the relatively induced vibration dipole 54 exists only for polarized light in the in-plane direction of FIG. 4, and the scattered light is mainly generated in the in-plane direction between the optical axis and the electric field. Therefore, a scattering member that can selectively scatter polarized light in the direction of the paper of FIG. 4 can be realized. Further, the polarization of the scattered light is parallel to the in-plane direction of FIG. 4, and no component perpendicular to the paper surface is generated.

As the reverse mode polymer dispersed liquid crystal, a reverse mode holographic polymer dispersed liquid crystal in which low molecular liquid crystals are periodically distributed may be used. In this case, the display 11 has a configuration in which a reverse mode holographic polymer dispersed liquid crystal is provided instead of the reverse mode polymer dispersed liquid crystal 25 in FIG. The reverse mode holographic polymer-dispersed liquid crystal is generally disclosed in the form of papers as follows.

[K.Kato, T.Hisaki, M.Date, "Alignment-Co"
ntrolled Holographic PolymerDispersed Liquid Cryst
al for Reflective Diplay Devices ", Jpn.J. of Appl.P
hys., 38, pp. 805-808 (1999)] "Kato, Hisagi, Date," Holographic Polymer Dispersed Liquid Crystal with Controlled Orientation (HPDLC) ", IEICE Electronics Display Study Group (EID), 1999 January 22, 2008 (IEICE Technical Report EI
D98-139, pp.171-176) Note that in this document, "Alignment-controlled HPDLC" (Alignment-
Controlled HPDLC).

<Operation / Effect> According to the display device 10 according to the first embodiment, as a display device which constantly transmits one polarization component and displays an image with light having a polarization component orthogonal to the polarization component, The display 11 is used to display an image by driving the reverse mode polymer-dispersed liquid crystal 25 with the transparent electrodes 21 and 22. The two displays 11 are moved from the observer 13 so that the transmission polarization directions are orthogonal to each other. Since they are arranged in the depth direction when viewed, the following operations and effects can be obtained.

That is, the front display 11 and the rear display 1
1 and an image is displayed on each of the two display devices 1
In 1, since the transmission polarization directions are orthogonal to each other, not only the display light of the front display 11 but also the display light of the rear display 11 passes through the front display 11 and reaches the observer 13. Therefore,
The observer 13 can simultaneously view the display image of the front display device 11 and the display image of the rear display device 11, and can experience a display with a sense of depth.

Furthermore, since the display device 10 does not require a liquid crystal projector, the device can be made thinner.
In particular, in the present display device 10, the display device 11 has a configuration in which the light guide plate 23 is provided in close contact with the reverse mode polymer dispersed liquid crystal panel, and a cold cathode tube 28 as a light source is provided on a side portion of the light guide plate 23. Since the light source 29 emitted from the cold-cathode tube 28 is guided to the reverse mode polymer dispersed liquid crystal 25 by the light guide plate 23, the thickness is significantly reduced as compared with the case where a light source is provided in front of the display device 11 or the like. , And high efficiency can be achieved.

Also, the front display 11 and the rear display 1
By controlling the luminance of 1, a continuous sense of depth can be expressed. For example, as shown in FIG. 5, if the brightness of the display image 16a of the front display device 11 is reduced and the brightness of the display image 16b of the rear display device 11 is increased, a three-dimensional display image obtained by combining these is obtained. 16c is a rear display 1
Looks closer. Also, the display image 1 of the front display device 11
7a, the display image 17 on the rear display 11 is increased.
If the brightness of b is also increased (if the brightness is the same), the three-dimensional display image 17c obtained by combining these is displayed on the front display 11
At the middle position of the rear display 11. Also, if the brightness of the display image 18a of the front display device 11 is increased and the brightness of the display image 18b of the rear display device 11 is also reduced, the three-dimensional display image 18c obtained by combining these is displayed.
Looks closer.

As shown in FIG. 6, the front display 1
If the optical system 19 is provided between the camera 1 and the observer 13, the three-dimensional display image 20c obtained by combining the display image 20a of the front display 11 and the display image 20b of the rear display 11 becomes It is also possible to make it visible in front of the front display 11 (observer side) instead of between the display 11 and the rear display 11.

The operation and effect when the reverse mode holographic polymer dispersed liquid crystal is used as the reverse mode polymer dispersed liquid crystal of the display 11 are as follows.

The reverse mode holographic polymer-dispersed liquid crystal (R-HPDLC) is transparent when no electric field is applied, and becomes a diffracted state with respect to one polarized light component when an electric field is applied. One polarized light component of the light propagating through the light plate 23 can be emitted, and image display can be realized by matrix driving. RH
Since the display device 11 made of PDLC does not disturb the polarization orthogonal to the display light, a display having a sense of depth in which the display image of the front display device 11 and the display image of the rear display device 11 are combined is possible. is there.

Since diffraction is used, R-HP
Since DLC has wavelength selectivity, color display can be realized even when a white light source is used. Note that R
When the HPDLC is used, the scattering state becomes a light emitting state. Therefore, when the display device 11 is illuminated from the observer 13 side, the display device 11 emits light due to the illumination light and the color purity is reduced. Since there is an angle, even if illumination is performed from the observer 13 side, display with high color purity can be realized without affecting display.

[Embodiment 2] FIG. 7 is a configuration diagram of a display device of a display device according to Embodiment 2 of the present invention.

<Configuration> In the display 11 of the first embodiment, the reverse mode polymer dispersed liquid crystal panel (the alignment film 26,
The light guide plate 23 is adhered to only one surface of the reverse mode polymer-dispersed liquid crystal panel (see FIG. 2), but is not limited thereto. A light guide plate may be provided.

That is, as shown in FIG.
In the display device 111 of the display device of FIG.
24 are used as a light guide plate, and are in close contact with both surfaces of the reverse mode polymer dispersed liquid crystal panel.
A cold cathode tube 28 as a light source is provided on each of the side portions 3 and 24.

The other configuration of the display device 111 and the overall configuration of the display device are the same as those in the first embodiment, and thus description and illustration thereof are omitted here (the above description and FIG. 1). To FIG. 6).

<Operation / Effect> According to the display device of the second embodiment, the display device 111 has a configuration in which the light guide plates 23 and 24 are provided on both sides of the reverse mode polymer dispersed liquid crystal panel. The light emitted from the tube 28 is passed through the light guide plates 23 and 24 to the reverse mode polymer dispersed liquid crystal 25.
, The amount of light emitted from the reverse mode polymer dispersed liquid crystal 25 increases, and the displayed image becomes clearer.

[Embodiment 3] FIG. 8 is a configuration diagram of a display device of a display device according to Embodiment 3 of the present invention, and FIG. 9 is a configuration diagram of a display device according to Embodiment 3 of the present invention.

<Structure> The display device 11 of the first embodiment has a structure in which a cold-cathode tube 28 as a light source is provided on the side of the light guide plate 23 in order to greatly reduce the thickness and increase the efficiency (FIG. 2), the configuration is not limited thereto, and the reverse mode polymer-dispersed liquid crystal may be illuminated by ambient light from the front or the like.

That is, as shown in FIG.
In the display device 211 of the display device according to, the light guide plate is not used,
Both sides are simply provided with transparent substrates 23 and 24. The light source 212 is provided around the display 211 (in the illustrated example, diagonally forward of the display 211).

In this case, the display device has a configuration as shown in FIG. That is, as shown in FIG. 9, a reverse mode polymer-dispersed liquid crystal is driven by a plurality of electrodes as a display that constantly transmits one polarization component and displays an image with light having a polarization component orthogonal to the polarization component. A display device 211 for displaying an image is used, and the two display devices 211 are arranged in the depth direction as viewed from the observer 13 such that the transmission polarization directions are orthogonal to each other. Then, the front display 211 and the rear display 211 are configured to be illuminated by the light source 212, respectively.

The other components of the display device 211 are the same as those in the first embodiment, and thus the description and illustration thereof are omitted here (see the above description and FIGS. 1 to 6).

<Operation / Effect> The display device 210 of the third embodiment also allows the observer 13 to display the image on the front display 211 and the display on the rear display 211 similarly to the first embodiment. The display image and the display image can be viewed at the same time, and a display with a sense of depth can be experienced.

Moreover, since the display device 210 does not require a liquid crystal projector, the device can be made thinner. Although a space for disposing the light source 211 is required, the device is thinner than a case where a liquid crystal projector is used. By illuminating the display surface with the light source 212, high contrast can be achieved.

[Fourth Embodiment] FIG. 10 is a configuration diagram of a display device according to a fourth embodiment of the present invention.

<Structure> As shown in FIG. 10, a display device 310 of the fourth embodiment
The configuration is such that a wavelength plate 311 is provided on the surface on the third side.

The other structure of the display device 310 is the same as that of the first embodiment, and the description and illustration thereof are omitted here (see the above description and FIGS. 1 to 6).

<Operation / Effect> According to the display device 310 of the fourth embodiment, the polarization dependence of the display light is eliminated by providing the wave plate 311 on the surface of the display device 310 on the observer 13 side. Therefore, the display image can be viewed naturally even when the observer 13 wears sunglasses or the like having polarization selectivity.

[Fifth Embodiment] FIG. 11 is a configuration diagram of a display device according to a fifth embodiment of the present invention.

<Structure> Display device 10 of the first embodiment
Uses two displays 11, but is not limited to this.
Three or more (for example, four as shown in FIG. 11) display devices 1
1 can be used in a state where the display surface interval is small.

That is, as shown in FIG. 11, the display device 410 according to the fifth embodiment is a display device that constantly transmits one polarization component and displays an image with light having a polarization component orthogonal to the polarization component. A display 11 that displays an image by driving the reverse mode polymer-dispersed liquid crystal with the transparent electrodes 21 and 22 is used, and the four displays 11 are arranged such that the transmission polarization directions of the adjacent displays 11 are orthogonal to each other. As seen from the observer, it is arranged in the depth direction (note that
In the following, the four display devices 11 are arranged one by one from the observer 13 side.
The second display, the second display, the third display, and the fourth display).

In the illustrated example, the first display 11 is
The image is displayed with the polarized light 411 parallel to the paper of FIG. 1 and is set so as to transmit the polarized light 412 perpendicular to the paper of FIG. 11, and the second display 11 has the polarization 412 perpendicular to the paper of FIG. To display an image, and polarized light 41 parallel to the plane of FIG.
1 is set to be transparent. The third display 11 displays an image with polarized light 411 parallel to the paper of FIG. 11, and is set to transmit polarized light 412 perpendicular to the paper of FIG. Is set so that an image is displayed with polarized light 412 perpendicular to the paper surface of FIG. 11, and polarized light 411 parallel to the paper surface of FIG. 11 is transmitted. Of course,
The present invention is not limited thereto, and the absolute transmission polarization direction of the display 11 is arbitrary as long as the transmission polarization directions of the adjacent displays 11 are orthogonal to each other.

The other configuration of the display device 410 is the same as that of the first embodiment, and thus the description and illustration thereof are omitted here (the above description and FIGS. 1 to 6).
reference).

<Operation / Effect> According to the display device 410 of the fifth embodiment, a reverse display is used as a display device which always transmits one polarization component and displays an image with light having a polarization component orthogonal to the polarization component. Mode polymer dispersed liquid crystal with transparent electrode 2
Display 1 that displays an image by driving with 1, 22
1, four display units 11 are connected to adjacent display units 1
1 are arranged in the depth direction as viewed from the observer so that the transmission polarization directions of the 1 light are orthogonal to each other, the following operation and effect can be obtained.

That is, an image is displayed on each of the four display devices 11. The display light of the first display 11 is
It reaches the observer 13 as it is. The display light of the second display 11 passes through the first display 11 and reaches the observer 13. The display light of the display of the third display 11 is transmitted through the second display 11, and further transmitted through the first display 11 if not overlapped with the display of the first display 11 for observation. Person 13 (details will be described later). The display light of the fourth display 11 passes through the third display 11, and if the display light does not overlap with the display of the second display 11, the second display 11
(Details will be described later), and finally, the first display device 11 also reaches the observer 13 by transmission.

Therefore, the observer 13 can read the first display 1
1 display image, the display image of the second display device 11,
The display image of the fourth display device 11 and the display image of the fourth display device 11 can be viewed simultaneously, and a display with a sense of depth can be experienced.

Further, since no liquid crystal projector is required, the four display devices 11 can be arranged in a state where the display surface interval is small, and the four display surfaces can be easily formed. That is, even if three or more (here, four) display devices 11 are arranged in the depth direction, the depth of the display device 410 is extremely thin as compared with a display device using a liquid crystal projector.

Further, by controlling the luminance ratio of the corresponding pixel of an arbitrary adjacent display device 11, an image is not disturbed between adjacent display devices 11, and therefore, as described in the first embodiment. A continuous feeling of depth can be expressed with various effects.

Here, the display light of the third display 11 is 1
The fourth display 11 and the fourth display 11
The transmission of the display light through the second display 11 will be described.

The display 11 transmits all polarized components when no electric field is applied, that is, when no display is performed. When an electric field is applied, only a specific polarization component is scattered to perform display, and a polarization component orthogonal to the display light is always transmitted. Therefore, when three or more displays 11 are arranged so that the polarization directions of the display light are orthogonal to each other between the adjacent displays 11, the display light from the display 11 deeper than the adjacent displays 11 is used. Even if there is no overlap with the display portion of the display device 11 in front, all of the light is transmitted and visible to the observer 13. For example, in FIG. 11, even if the display light from the third display 11 deeper than the adjacent second display 11 does not overlap with the display part of the first display 11 on the near side, Are all transmitted and visible to the observer 13.

When the display portions overlapping in the depth direction between the display devices 11 that are not adjacent to each other are in the scattering state at the same time (for example, the display portion of the first display device 11 and the display portion of the third display device 11 overlap each other). In this case, the displayed image is deteriorated due to the optical influence. However, in the image display, it is extremely rare that the overlapping pixels are in the scattering state at the same time from the viewpoint of the observer 13. Deterioration of the display image due to the display light of the display 11 being scattered by the display 11 at the front can be practically ignored.

[0076]

As described above in detail with the embodiments, according to the display device of the first invention, one polarized light component is always transmitted, and the polarized light component is orthogonal to the polarized light component. Using a display device for displaying images, the two display devices are arranged in the depth direction when viewed from the observer such that the transmission polarization directions are orthogonal to each other. It is possible to see the display image of the display device on the side at the same time, and to experience a display with a sense of depth. Moreover, since no liquid crystal projector is required, the device can be made thinner.

According to the display device of the second aspect of the present invention, a display device that transmits one polarized light component at all times and displays an image with light having a polarized light component that is orthogonal to the polarized light component is used. The devices are arranged in the depth direction when viewed from the observer so that the transmission polarization directions of the adjacent displays are orthogonal to each other, so that the observer can simultaneously view the display images of three or more displays, It is possible to experience a display with a sense of depth. Moreover, since no LCD projector is required,
Arrange three or more display devices in a state where the display surface interval is narrow,
It is possible to easily configure three or more display surfaces. That is, even if three or more display devices are arranged in the depth direction, the depth of the display device becomes extremely thin as compared with a display device using a liquid crystal projector.

Further, in the display device of the third invention, in the display device of the first or second invention, a display device for displaying an image by driving a reverse mode polymer dispersed liquid crystal with a plurality of electrodes is used. Because the configuration was
Alternatively, an effect similar to that of the first invention can be obtained.

According to the display device of the fourth invention, the third device
In the display device of the present invention, the display device is provided with a light guide plate in close contact with the reverse mode polymer dispersed liquid crystal panel,
A light source is provided on the side of the light guide plate, and light emitted from the light source is configured to be guided to the reverse mode polymer-dispersed liquid crystal by the light guide plate. The thickness can be reduced, and the efficiency can be improved.

According to the display device of the fifth invention, the fourth device
In the display device of the present invention, since the display device has a configuration in which light guide plates are provided on both sides of the reverse mode polymer dispersed liquid crystal panel, light emitted from the light source can be guided to the reverse mode polymer dispersed liquid crystal by both light guide plates. As a result, the amount of light emitted from the reverse mode polymer dispersed liquid crystal increases, and the displayed image becomes clearer.

According to the display device of the sixth invention, in the display device of the third, fourth or fifth invention, since the reverse mode holographic polymer dispersed liquid crystal is used as the reverse mode polymer dispersed liquid crystal, the depth is reduced. The reverse mode holographic polymer-dispersed liquid crystal has wavelength selectivity, and a color display can be realized even when a white light source is used.

According to the display device of the seventh invention, in the display device of the first, second, third, fourth, fifth, or sixth invention, a wave plate is provided on the viewer-side surface of the display device. With this arrangement, the polarization dependence of the display light can be eliminated, so that the display image can be viewed naturally even when the observer wears polarization-selective sunglasses or the like.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a display device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a display device provided in the display device.

FIG. 3 is a diagram illustrating a case where a reverse mode polymer dispersed liquid crystal of the display is driven by a TFT method.

FIG. 4 is an explanatory view showing the operation of the reverse mode polymer dispersed liquid crystal.

FIG. 5 is an explanatory diagram in the case of expressing a continuous sense of depth.

FIG. 6 is an explanatory diagram in the case of expressing a continuous sense of depth.

FIG. 7 is a configuration diagram of a display device of a display device according to Embodiment 2 of the present invention.

FIG. 8 is a configuration diagram of a display device of a display device according to Embodiment 3 of the present invention.

FIG. 9 is a configuration diagram of a display device according to Embodiment 3 of the present invention.

FIG. 10 is a configuration diagram of a display device according to Embodiment 4 of the present invention.

FIG. 11 is a configuration diagram of a display device according to a fifth embodiment of the present invention.

FIG. 12 is a configuration diagram of a conventional projector.

[Explanation of symbols]

 10, 210, 310, 410 Display device 11, 111, 211 Display device 13 Observer 21, 22, Transparent electrode 23, 24 Transparent substrate (light guide plate) 25 Reverse mode polymer dispersed liquid crystal 26, 27 Alignment film 28 Cold cathode tube 30 Power supply 32 Cover 212 Light source 311 Wave plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideaki Takada 2-3-1 Otemachi, Chiyoda-ku, Tokyo F-term in Nippon Telegraph and Telephone Corporation (reference) 2H079 AA02 AA13 BA02 CA21 DA05 DA23 EB17 FA03 GA05 HA16 JA04 2H089 HA21 KA08 KA11 KA15 NA22 QA05 QA11 QA13 RA04 RA18 TA07 TA09 TA20 UA05 2H091 FA07Y FA19Y FD06 FD12 FD22 GA03 GA13 HA06 JA02 LA03 LA11 LA13 MA01 MA07

Claims (7)

[Claims] 1. A display device which constantly transmits one polarized light component and displays an image with light having a polarized light component orthogonal to the polarized light component. The two display devices are arranged such that transmitted polarization directions are orthogonal to each other. And a display device arranged in a depth direction as viewed from an observer. 2. A display device which constantly transmits one polarized light component and displays an image with light having a polarized light component orthogonal to the polarized light component, and transmits three or more such displays between adjacent display devices. A display device characterized by being arranged in a depth direction as viewed from an observer such that polarization directions are orthogonal to each other. 3. The display device according to claim 1, wherein a display device that displays an image by driving a reverse mode polymer dispersed liquid crystal with a plurality of electrodes is used as the display device. apparatus. 4. The display device according to claim 3, wherein the display device is provided with a light guide plate in close contact with the reverse mode polymer dispersed liquid crystal panel, and a light source is provided on a side portion of the light guide plate. A display device, wherein the light beam is guided to a reverse mode polymer-dispersed liquid crystal by a light guide plate. 5. The display device according to claim 4, wherein the display device has a configuration in which light guide plates are provided on both surfaces of a reverse mode polymer dispersed liquid crystal panel. 6. The display device according to claim 3, wherein a reverse mode holographic polymer dispersed liquid crystal is used as the reverse mode polymer dispersed liquid crystal. 7. The display device according to claim 1, wherein a wave plate is provided on a surface of the display device on an observer side.