JPH11288035A - Display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display capable of suppressing noise light and displaying a video having high contract on a screen. SOLUTION: An irradiation device 20 for emitting signal light 21 having recorded display information and a transmission type screen for transmitting signal light 21 which is made incident from the irradiation device 20 in the direction of an observer 4 are installed in a display. Reflection preventing members 14 and 15 are arranged on both faces of the observer 4-side and the back side of the transmission type screen or either side, or a polarized optical element is arranged on the back side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device using a screen, and more particularly to a display device capable of suppressing noise light and increasing the contrast of an image.

[0002]

2. Description of the Related Art As a display device for forming an image on a screen, a projector projection type display device using liquid crystal is known. This type of display device irradiates a transmission type or reflection type liquid crystal with light from a predetermined direction and emits signal light in which an image formed on the liquid crystal is recorded. Then, an image of the signal light is formed on a screen via an imaging lens or the like, and the transmitted scattered light or the reflected scattered light of the image emitted from the screen is visually recognized by a viewer.

Further, a CRT projector or the like is used in place of the liquid crystal projector, and R (red), G (green), B (blue)
There is also a device that emits a beam of three colors to form an image on a screen.

[0004] Further, the hologram is used as a screen, and by utilizing the diffraction function of the hologram, a method is used in which the characteristic of the screen as a scatterer is exhibited only for specific light incident from a specific direction. A display device has been proposed. That is, when a hologram on which a scatterer is recorded is used as a screen, the hologram screen scatters light only for irradiation light (signal light) incident from a specific direction, and transmits or transmits light incident from other directions. Make regular reflection. As a result, most of the surrounding light is not scattered on the hologram screen, so that the background brightness of the hologram screen does not increase, and the contrast of the image is improved (Japanese Patent Laid-Open No. 5-333435).
Reference).

Further, a method has been proposed in which external light absorbing means (black paint or the like) for absorbing external light is provided inside the hologram screen, thereby absorbing external light such as sunlight or an illumination lamp. See JP-A-5-88020).

[0006]

However, the conventional display device has the following problems. First, a display device using a normal screen has a problem that, in a bright environment, the contrast of an image is reduced due to light incident on the screen from the surroundings. Therefore, the display device can be used only in a limited place where the illuminance from the environment is low.

Further, the hologram screen has a refractive index difference at the interface between the constituent members on the viewer side and the back side of the hologram screen and the outside air, irrespective of the diffraction action of the hologram screen. Will occur. This causes a problem that the background on the viewer side overlaps with the image projected on the hologram screen, the contrast of the image is reduced, and the image is difficult to see. Note that this problem also occurs in a display device using an ordinary translucent screen.

In addition, since a translucent screen or a hologram screen can be seen from the viewer's side, the rear side of the image (the back side of the screen) is visible. And indoor light overlap, which causes a problem that the contrast of the image is reduced and the image is difficult to see.

Hereinafter, the above two problems will be described in detail using a display device using a transmission type hologram screen as an example. As shown in FIG.
, The normal image is the signal light 21 from the irradiation device 20.
Is formed by light rays 211 diffracted and transmitted by the hologram 11 constituting the transmission hologram screen 90. 19 includes a cover film 12 (resin product) and a hologram 11 sandwiched between glass plates serving as transparent substrates 13.

[0010] Then, the following two noise lights are generated with respect to the normal image, and the noise light causes a decrease in the contrast of the normal image. The background 40 (the building in FIG. 19) behind the viewer 4 is brightly illuminated by the irradiation of the strong external light such as the sun light 30 and the lighting. Light 41 from the background 40 is applied to the surface 1 of the transparent substrate 13 (the glass plate in FIG. 19).
31 and the back surface 121 of the cover film 12,
Lights 411 and 412 traveling in the direction of the viewer 4 become first noise light. In the display device 9 according to FIG.
The reflectance of the front surface 131 and the back surface 121 is about 8% in total.
However, in sunny weather or in an environment with strong illumination, the decrease in the contrast of a regular image due to the first noise light is very remarkable, and the viewer 4 feels that the image is difficult to observe.

Light 51 from the background 50 (houseplant in FIG. 19) on the back side of the hologram screen 90 (the irradiation device 20 side) is transmitted through the transmission type hologram screen 90 and travels in the direction of the viewer 4 511. And this becomes the second noise light.

The transmission hologram screen 90 diffracts the light 21 in the direction from the irradiation device 20 with high efficiency, but diffracts the light (41 and 51 in FIG. 1) from directions other than the irradiation device 20. Almost no occurrence. For this reason,
The second noise light is attenuated by reflection on the rear surface 121 and the front surface 131 of the transmission hologram screen 90, but the transmittance of the second noise light on the transmission hologram screen 90 is 90% or more. That is, most of the noise light is transmitted and reaches the viewer 4. Therefore, even if the rear surface side is normal indoor lighting, the contrast of the normal image with respect to the second noise light is significantly reduced, and the viewer 4 feels that the image is difficult to observe.

A reflection type hologram screen 900
As shown in FIG. 20, the first noise light 411, 412 and the second noise light 511 are reflected by the reflection type hologram screen 90 from a direction having no relation to the diffraction effect of the hologram 11, as shown in FIG. However, for the same reason as described above, the display device 9 according to FIG. 20 has exactly the same problem as that in the case of FIG. 19 using the transmission hologram screen 90 described above.

The present invention has been made in view of such a conventional problem, and has as its object to provide a display device capable of suppressing noise light and displaying an image having high contrast on a screen.

[0015]

According to the first aspect of the present invention, there is provided a display device having an irradiating device for emitting signal light in which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiating device in the direction of a viewer. Wherein the antireflection member is disposed on both the viewer's side and the rear side of the transmission screen, or only one of the viewer's side and the back side.

In the display device according to the first aspect of the present invention, an anti-reflection member is arranged on both sides or only one of a viewer side and a back side of a transmission screen,
The reflection at the transmissive screen of light from the viewer's background is reduced by the antireflection member. Note that the viewer side is the front surface of the transmission screen of the display device on which the viewer exists, and the back surface is the surface opposite to the viewer side.

Therefore, the light reflected by the transmissive screen toward the viewer (the first noise light 411, 4 in FIG. 1).
1, but FIG. 1 shows an example of a display device using a transmission hologram screen, in which antireflection members are arranged on both the viewer side and the back side. ) Greatly reduces the contrast of the image projected on the transmissive screen.

As described above, according to the present invention, it is possible to provide a display device using a transmissive screen capable of suppressing noise light and displaying an image with high contrast on the screen.

The transmissive screen means that an illuminating device is provided on the back side (that is, at a position facing the viewer with the screen interposed), and an image is formed by transmitting signal light through the screen. ing. In addition, the reflective screen described below means that an illuminating device is provided on the viewer side (that is, in the same direction as the viewer with respect to the screen), and the signal light is reflected by the screen to form an image. I have.

Next, a second aspect of the present invention has an irradiating device for emitting signal light on which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiating device in the direction of a viewer. A display device in which the signal light is linearly polarized light, wherein a polarizing optical element is disposed on the back side of the transmission screen, and the polarizing optical element is configured to selectively transmit the linearly polarized light. The display device is characterized in that:

In the display device according to the second aspect of the present invention, a polarizing optical element is disposed on the back side of the transmission screen. This polarizing optical element can greatly reduce the second noise light generated when the light from the background on the back side passes through the transmission screen. Further, the first noise light formed by reflecting light from the viewer's background on the rear side of the transmission screen can be greatly reduced.

To explain this, light from the background on the viewer side is generally random polarized light. This light is partially reflected on the viewer side of the transmissive screen, but most of the light is transmitted through the transmissive screen.

In the display device according to the present invention, the light traveling inside the transmission screen is reflected on the back side after passing through the polarizing optical element, but the intensity of the light traveling at the stage of passing through the polarizing optical element. Greatly decay. This is because many of the components constituting the randomly polarized light are adapted to the absorption axis of the polarizing optical element and are absorbed by the element.

The unabsorbed light is further reflected on the back side of the polarizing optical element disposed on the back side of the transmission screen to become first noise light, but after being reflected, further passes through the polarizing optical element. The intensity is further reduced by reaching the viewer. Further, since the light from the background side is also absorbed by the polarization optical element, the intensity of the second noise light is greatly reduced. Further, by arranging the signal light (linearly polarized light) from the irradiation device so that the absorption axis of the polarization optical element is perpendicular to the signal light, the signal light from the irradiation device can be almost transmitted.

Therefore, according to the present invention, the first noise light and the second noise light are reduced, and most of the signal light from the irradiation device passes through the polarizing optical element, so that a display with a very high contrast of the image is displayed. A device can be obtained.

Further, the display device according to the present invention has an effect of reducing the following third and fourth noise light. As shown in FIG. 7, a certain signal light 21 is incident on a transmission screen (the transmission hologram screen 10 in FIG. 7) at an incident angle α to form a diffracted light 211. If there is no polarizing optical element 16 in FIG.
When light (in the example of FIG. 7, sunlight) enters the transmission screen from the viewer side, it is specularly reflected on the back side of the transmission screen to become light 301, and this light 301 has the same angle as the signal light 21. If there is, the light 301 is the diffracted light 2 of the signal light 21.
The light is diffracted and transmitted in the same direction as 11. This is the third noise light 302.

The light 31 (in FIG. 7, reflected light of sunlight on the ground) incident on the transmissive screen from the direction opposite to the incident angle α of the signal light 21 is diffracted and transmitted by the transmissive screen to form light 311. Is formed. Temporarily polarizing optical element 1
If there is no light 6, the light 311 is reflected in the direction of the viewer 4 to form the fourth noise light 312.

The third noise light 302 is incident on the transmission type screen along the path, and is specularly reflected on the outer surface 161 of the polarization optical element 16 before being diffracted and transmitted by the transmission type screen. The strength is greatly reduced at the stage of reciprocating. Regarding the fourth noise light 312,
After diffracting and transmitting through the transmission type screen along the path, the light is further reflected by the outer surface 161 of the polarizing optical element 16, and the intensity is greatly reduced at the stage of reciprocating in the polarizing optical element 16.

In a structure in which a polarizing optical element is disposed on the back side of a transmission screen described later, and in a structure in which a semi-transmissive or opaque optical member or a polarizing optical element is disposed on the back side of a reflective screen, the third and the third embodiments are also described. The fourth noise light reduction effect can be obtained.

Next, a third aspect of the present invention has an irradiating device for emitting signal light on which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiating device in the direction of a viewer. A display device in which the signal light is linearly polarized light, wherein a polarizing optical element is disposed on the back side of the transmission screen, and the polarizing optical element is configured to selectively transmit the linearly polarized light. The display device further comprises an antireflection member disposed outside the polarizing optical element.

According to a third aspect of the present invention, there is provided a display device in which an antireflection member is further disposed outside the polarizing optical element provided on the transmission screen according to the second aspect of the present invention. The polarizing optical element is the second from the back side background.
Noise light can be greatly reduced, and by arranging the signal light (linearly polarized light) from the irradiation device so that the absorption axis of the polarizing optical element is perpendicular to the signal light, the signal light from the irradiation device is almost transmitted through the transmission screen. Can be done.

Further, as described above, the polarizing optical element significantly reduces the first noise light 412 (see FIG. 6 and the like) formed by reflecting the background on the viewer side on the back side of the transmission screen. be able to. Further, the anti-reflection member can greatly reduce the first noise light 412 (see FIG. 6 and the like) formed by reflecting the background on the viewer side on the back side of the transmission screen. As described above, the first noise light and the second noise light are reduced, and the signal light can be almost transmitted through the transmissive screen, so that the contrast of an image can be greatly improved.

Next, as in the fourth aspect of the present invention, there is provided an irradiating device for emitting signal light on which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiating device in the direction of the viewer. The signal light is a display device that is linearly polarized light, wherein an antireflection member is disposed on the viewer side of the transmission screen, and a polarizing optical element is disposed on the back side of the transmission screen. And the polarizing optical element is configured to selectively transmit the linearly polarized light.

That is, the display device according to the fourth aspect of the present invention comprises an anti-reflection member,
The above-mentioned polarizing optical element is arranged on the back surface side. The anti-reflection member reduces the reflection of the background on the viewer side on the viewer side of the transmissive screen (the first noise light 41 in FIG. 6 and the like).
1), the polarization optical element greatly reduces the second noise light (see noise light 511 in FIG. 6 and the like) from the background on the back side, and furthermore, the polarization optical element converts the signal light (linearly polarized light) from the irradiation device into polarization optics. By arranging the absorption axes of the elements at right angles, it is possible to configure so that the transmission screen almost transmits the signal light from the irradiation device.

Further, as described above, the polarizing optical element greatly reduces the first noise light 412 (see FIG. 6 and the like) formed by reflecting light from the viewer's background on the back side of the transmission screen. Can be reduced.

As described above, both the first noise light due to the background on the viewer side and the second noise light due to the background on the back side can be greatly reduced. Therefore, the display device according to the present invention has the first and second noise lights. The contrast of the image with respect to the noise light can be greatly increased (the noise light 411, 4 in FIG. 6 etc.).
22, 511).

Next, a fifth aspect of the present invention includes an irradiating device for emitting signal light in which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiating device in the direction of a viewer. The signal light is a display device that is linearly polarized light, wherein an antireflection member is disposed on the viewer side of the transmission screen, and a polarizing optical element is disposed on the back side of the transmission screen. And a polarizing optical element configured to selectively transmit the linearly polarized light, and an anti-reflection member disposed outside the polarizing optical element.

That is, in the display device according to the fifth aspect of the present invention, as described above, the anti-reflection member reduces the reflection of light from the background on the viewer side on the viewer side of the transmissive screen ( The first noise light 411 shown in FIG. 6 and the like, and the second noise light (see the noise light 511 shown in FIG. 6 and the like) formed by light from the background on the back side of the polarizing optical element.
The signal light from the irradiation device (linearly polarized light) is arranged so that the absorption axis of the polarizing optical element is orthogonal to the signal light from the irradiation device, so that the signal light from the irradiation device almost passes through the transmissive screen. Can be.

Further, as described above, the polarizing optical element greatly reduces the first noise light 412 (see FIG. 6 and the like) formed by reflecting the viewer's background on the back side of the transmission screen. be able to.

As described above, both the first noise light due to the background on the viewer side and the second noise light due to the background on the back side can be greatly reduced. Therefore, the display device according to the present invention has the first and second noise lights. The contrast of the image with respect to the noise light can be greatly increased (the noise light 411, 4 in FIG.
22, 511).

Next, a sixth aspect of the present invention is a display device having an irradiating device for emitting signal light on which display information is recorded, and a reflective screen for reflecting the signal light incident from the irradiating device in the direction of a viewer. Wherein the reflection-type screen is provided with an anti-reflection member disposed on both the viewer's side and the back side, or only one of them.

The display device according to claim 6 of the present application has a structure in which the transmission screen of the invention of claim 1 is changed to a reflection screen. Therefore, the light reflected on at least one of the viewer side and the back side of the reflection type screen and directed toward the viewer (see noise lights 411 and 412 in FIG. 9; however, FIG. 9 shows the viewer side and the back side). (The antireflection members are disposed on both sides), and the contrast of the image reflected on the reflective screen can be increased.

As described above, according to the present invention, it is possible to provide a display device using a reflective screen which can suppress noise light and display an image having high contrast on the screen.

Next, a seventh aspect of the present invention is a display device having an irradiating device for emitting signal light on which display information is recorded, and a reflective screen for reflecting the signal light incident from the irradiating device in the direction of a viewer. A translucent or opaque optical member or a polarizing optical element is disposed on the back side of the reflective screen.

The invention according to claim 7 of the present application is a display device in which a translucent or opaque optical member is disposed on the back side of a reflective screen, or a polarizing optical element is disposed. Thus, the above-described optical member and the polarizing optical element reduce the reflection of the light from the viewer's background on the back side of the reflective screen, and the light from the background on the back side of the reflective screen is reflected on the reflective screen. , And noise light generated by transmitting the light can be reduced. Therefore, it is possible to provide a display device using a reflective screen which can display an image having a high contrast on a screen.

The translucent or opaque optical element includes smoke, a black film, a black paint, and the like.

The effect of the translucent or opaque optical member will be described in detail (FIG. 10, noise light 412,
511), with respect to the reflection of the background on the viewer side on the back side of the reflective screen, light from the background on the viewer side is partially reflected on the surface of the reflective screen, but most of the light is reflected on the reflective screen. It travels through the inside of the screen, transmits through it, and almost attenuates when it passes through the translucent or opaque optical member.
Further, the reflected light is almost attenuated when returning.

Therefore, the noise light 412 reflected on the back surface of the semi-transparent or opaque optical member, which is the back surface of the reflection type screen, is greatly reduced due to the presence of the semi-transparent or opaque optical member. If a material having a lower light transmittance is used as the semi-transmissive optical member, the noise light 412 can be further reduced.

Next, with respect to noise light generated when light from the background on the back side of the reflective screen passes through the reflective screen, the transmitted light is reduced according to the transmittance of the semi-transparent optical member. Noise light 5
11 can be greatly reduced. If a material having a lower light transmittance is used as the semi-transmissive optical member, the noise light 412 can be further reduced. Further, since the opaque optical member has a transmittance of 0%, the contrast of an image is best.

For a regular image, the signal light 21 from the irradiation device and its diffracted light 211 do not have an optical path that passes through a semi-transparent or opaque optical member. Alternatively, it is constant regardless of the transmittance of the opaque optical member. Therefore, by providing the optical member, the intensity of the signal light does not decrease. The same applies to the case where a polarizing optical element is used instead of an optical member.

Next, an eighth aspect of the present invention is a display device having an irradiating device for emitting signal light on which display information is recorded, and a reflective screen for reflecting the signal light incident from the irradiating device in the direction of the viewer. An anti-reflection member is disposed on the viewer side of the reflective screen, and a semi-transmissive or opaque optical member or a polarizing optical element is disposed on the back side of the reflective screen. A display device characterized by the above-mentioned.

According to the invention of claim 8 of the present application, an anti-reflection member is arranged on the viewer side of the reflective screen as in claim 6, and a semi-transparent or opaque optical member is provided on the back side as in claim 7. , Or a polarizing optical element. The anti-reflection member greatly reduces the intensity of light reflected on the viewer side of the reflection type screen toward the viewer, and the optical member or the polarizing optical element on the back side absorbs light from the viewer side background. It is possible to reduce the reflection on the rear surface side of the reflective screen, and also reduce the noise light generated when the light from the background on the rear surface side of the reflective screen passes through the reflective screen. Therefore, it is possible to provide a display device using a reflective screen which can display an image having a high contrast on a screen.

Next, it is preferable that the transmission screen is a transmission hologram screen. Further, as described in claim 10, the reflection type screen is preferably a reflection type hologram screen. The above-mentioned transmission and reflection hologram screens are transmission and reflection hologram screens constructed using holograms, and use only the specific light incident from a specific direction using the diffraction function of the hologram. This is a screen configured to exhibit the characteristics of a screen as a scatterer.

The hologram screen scatters only signal light incident from a specific direction, and transmits or specularly reflects light incident from other directions. As a result, most of the surrounding light is not scattered on the hologram screen, so that the background brightness of the hologram screen does not increase, and the contrast of the image can be increased.

Next, the image contrast of the display device is preferably 2 or more. As shown in FIG. 3 in detail in the first embodiment, when the appearance of the image on the screen is evaluated by image contrast (evaluated by visual observation by the evaluator), the noise level which is an allowable level of the appearance of the image is evaluated. It can be seen that in order to achieve “light can be seen but not bothersome” or more, image contrast of 2 or more is required. Therefore, if the image contrast is 2 or more, a display device with a good image appearance can be obtained. The higher the above-mentioned image contrast, the more
The image looks better.

Next, the luminous reflectance of the antireflection member is preferably 2.5% or less. Thereby, the image contrast of the image can be further increased. If the luminous reflectance is larger than 2.5%, the image contrast may be reduced. Further, there is no lower limit of the luminous reflectance, and the lower the lower, the higher the image contrast. The luminous reflectance is defined by the following (Equation 1).

[0057]

(Equation 1)

Next, it is preferable that the transmittance of the polarizing optical element be 65% or less.
Thereby, the image contrast of the image can be further increased. If the transmittance is greater than 65%, the image contrast may be reduced, and the appearance of the image may be degraded. The lower limit of the transmittance is preferably 20% or more because the transmittance of the signal light from the irradiation device 20 is reduced.

Next, it is preferable that the anti-reflection member is a glossy anti-reflection member. Accordingly, noise light from the background of the antireflection member on the viewer side can be reduced by interference, and the brightness can be reduced. In addition, noise light from the background on the back side of the transmissive or reflective screen can be scattered, and the luminance thereof can be reduced.

Note that "glossy" does not mean that the surface is provided with fine irregularities and that the reflectance is reduced by the interference effect of scattering incident light, but that a thin film is formed on the surface and the interference effect is reduced. Refers to an antireflection member having a performance of lowering the reflectance. Examples of glossy anti-reflection members include those in which an interference film is manufactured by vapor deposition and those in which an interference film is manufactured by dip.

Next, it is preferable that the antireflection member is a non-glare antireflection member. This makes it possible to reduce noise light from the background of the anti-reflection member on the viewer side by interference and reduce the brightness, similarly to the invention of the fourteenth aspect. In addition, noise light from the background on the back side of the transmissive or reflective screen can be scattered, and the luminance thereof can be reduced. The “non-glare property” refers to an anti-reflection member having a performance of providing fine irregularities to scatter incident light to lower the reflectance.

Next, it is preferable that the anti-reflection member is a glossy non-glare anti-reflection member having both glossy anti-reflection performance and non-glare performance. Thereby, noise light formed by reflecting light from the viewer's background can be further reduced.

Next, a light control optical member may be disposed between the transmissive screen or the reflective screen and the antireflection member on the viewer side. preferable.

The light control optical member has a function of absorbing light in a specific incident angle range and transmitting light in the other range as shown in FIG. 11 described later.
In the figure, the outside surrounded by a line R is an absorption angle region, and the inside surrounded by a line R is a transmission angle region. Therefore, by arranging the irradiating device 20 and the like so that the diffracted light 21 constituting the regular image enters the transmission angle region of the light control optical member, light in a part of the incident angle range is absorbed by the light control optical member. The brightness of the first noise light caused by the background on the viewer side and the brightness of the second noise light caused by the background on the back side can be further reduced.

The display device of the present invention as described above can be used in various environments and places as various video screens, as shown in each embodiment described later. For example, the display device of the present invention can be installed on a window glass of a show room and used for the purpose of presenting various images to passers-by, and the display device of the present invention can be displayed on a window glass of a moving body such as a car. By applying the device, the operation of the present invention as described above can be achieved.

[0066]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A display device according to the present invention will be described with reference to FIGS. As shown in FIG. 1, the display device 1 of the present embodiment includes an irradiating device 20 for emitting a signal light 21 on which display information is recorded, and a transmission type hologram 11, and displays the signal light 21 incident from a predetermined angle α. And a transmissive hologram screen 10 having a directivity of diffracting and transmitting in the directions of 4.

Anti-reflection members 14 and 15 are arranged on both sides of the transmission type hologram screen 10 on the viewer side and the back side. As the antireflection members 14 and 15, an antireflection film having a luminous reflectance of 0.8% was used.

The following is a supplementary explanation for each.
The irradiation device 20 includes a light source 201, a liquid crystal element 202 on which an image is recorded, a reflector 203 that converts divergent light emitted from the light source 201 into parallel light, and an imaging lens 22. As shown in FIG. 1, the transmission type hologram screen 10 includes a hologram 11 and a transparent substrate 13 made of a glass plate.
And the cover film 12 and the anti-reflection member 1
4, 15 are arranged on both sides.

The hologram 11 is a transparent transmission-type hologram. In order to prevent the 0-order diffracted light from entering the eyes of the viewer 4, the signal light 21 is transmitted from the imaging lens 22 obliquely above.
Is irradiated on the hologram 11, the angle of the signal light 21 to be irradiated is bent by diffraction, and the diffracted light 2 is centered on the substantially horizontal direction.
11 is scattered so that the viewer 4 can visually recognize the image. Signal light 2
The bending angle between 1 and the diffracted light 211 is about 30 to 40 degrees at the center of the transmission hologram screen 10.

The hologram 11 has interference fringes formed by the optical system shown in FIG. 2, the photosensitive material 89 is dichromated gelatin, and the object to be recorded has a surface roughness of about # 1000 (irradiation of irradiation light). Frosted glass 80 having a surface roughness near the wavelength). Here, the photosensitive material 89 may be a photopolymer, a silver salt, or a photoresist.

That is, the optical path of the coherent light 875 emitted from the laser light source 81 is bent by the mirror 82 and then split by the half mirror 83 into an optical path toward the object light 876 and an optical path toward the reference light 877. Then, the light 8751 that has exited on one side (left side of the paper) is converted into parallel light through a mirror 841, an objective lens 842, and an off-axis parabolic mirror 843, and then passes through a frosted glass 80 serving as a diffusion plate to generate an object light. 8
76 is formed, and enters the photosensitive material 89 via the half mirror 87.

On the other hand, the other light 8 exiting the half mirror 83
752 is an objective lens 86 through mirrors 861 and 862
After being converted into divergent light at 3, the light enters a photosensitive material 89 as reference light 877 via a half mirror 87. As a result, a transmission type hologram in which the ground glass 80 is recorded is formed on the photosensitive material 89. As a result, if the hologram 11 is irradiated with reproduction light from the direction of the reference light 877 in FIG.
The diffracted light transmitted through the hologram 11 becomes the same light as the light diffused by the frosted glass 80.

The hologram 11 of this example has a diffraction efficiency of about 3
The half angle at half maximum of the scattering of the diffracted light 211 (the difference between the angle of the scattered light at which the intensity is half the value and the angle of the scattered light at the maximum) is about 6 degrees. The normal image brightness of the transmission hologram screen 10 of this example is 500 when the diagonal length of the transmission hologram screen 10 is 40 inches.
cd / m ² , and the image luminance of a CRT display or a direct-view type liquid crystal display is 100 to
This is a sufficiently large value considering that it is 200 cd / m ² .

By the way, in the display device 1 of the present embodiment, the background light on the viewer side is reflected on the viewer side or the back side surface of the transmission hologram screen 10, and the background light on the back side is transmitted on the transmission hologram screen 10. Therefore, it is necessary to study the image contrast in view of the installation location of the display device 1. As shown in FIG. 1, it is assumed that the display device 1 of the present embodiment is used at the boundary between the outdoor and the indoor, and the viewer is outdoors and observes the image of the transmission hologram screen 10 while seeing through the indoor background. Think. The brightness of the background on the viewer side is as high as about 10,000 cd / m ² (white walls of buildings, white cars, etc.). The brightness of the background on the back side is about 50 cd / m ² in a normal indoor environment.

Therefore, as shown in FIG. 19, if the anti-reflection members 14 and 15 are not provided, 4% on the viewer side of the transmission type hologram screen 90 and 3.2% on the back side thereof (=).
0.9 × 4 × 0.9), and a total of 7.2% reflection occurs. For this reason, the first due to the background 40 on the viewer side
Noise light 411, 412 has a maximum brightness of 720 cd /
m ² . The second noise light 511 due to the background 50 on the back side is about 45 (= 50 × 0.9) cd / m ² . Therefore, the combined brightness of the first noise light and the second noise light exceeds the normal video luminance of 500 cd / m ² . Here, 0.9 is the transmittance of the transmission type hologram screen 10.

The contrast of an image is defined as follows. (Contrast of image) = ｛(regular image brightness) + a +
b｝ / (a + b) Here, a: luminance of the first noise light due to the background on the viewer side, b: luminance of the second noise light due to the background on the back side. Therefore, in the case of the above example, the contrast of the image is 1.6 ((500 + 720 + 45) / (720 + 4).
5)).

Here, in order to determine the image contrast that can provide a good-looking image for the viewer, the contrast of the image is adjusted by changing the luminance of the background on the viewer side and the luminance of the background on the back side. Sensory evaluation was performed. The results are shown in FIG. As can be seen from FIG. 3, it was found that the contrast of the image required 2 or more, and more preferably 3 or more. Therefore, as shown in FIG. 19, in the display device 9 without the anti-reflection members 14 and 15, it was found that the image became difficult to see.

Next, in the display device 1 of this embodiment, when the anti-reflection member is used on both the viewer side and the back side, and when the anti-reflection member is used only on the viewer side, Table 1 summarizes the reflectance and the image contrast. For reference, the case where no anti-reflection member is provided on both surfaces is also described.
The table shows that according to this example, a display device having high image contrast can be obtained.

[0079]

[Table 1]

According to the table, when anti-reflection members are used on both sides (display device having the structure as shown in FIG. 1), there is no difficulty in seeing the viewer's background due to reflection on the transmission type hologram screen. I understood that. It was also found that the image contrast could be improved to an acceptable level even when the antireflection member was provided only on the viewer side.

As described above, in the display device 1 according to the present embodiment, the anti-reflection members 14 and 15 are arranged on both sides (or only one side) of the transmission type hologram screen 10 on the viewer side and the back side. , The antireflection members 14, 1
5 is the first due to the reflection of light from the viewer's background.
Noise light 411, 412 can be reduced.

As described above, according to the present embodiment, it is possible to provide a display device using a transmission type hologram screen which can suppress noise light and display an image having high contrast on the screen.

Further, in a display device having antireflection members disposed on both surfaces, it is necessary to satisfy the following expression (1) in order to increase the image contrast to 2 or more. {10000 × (r + r × 0.9 × 0.9) +45} / {500 + 10000 (r + r × 0.9 × 0.9) +45} ≧ 2. . . Equation (1) Here, r is a value obtained by dividing the reflectance (%) of the antireflection member by 100. From the above equation (1), the reflectance r of the anti-reflection member
Was found to need to be 2.5% or less.

In a display device in which an anti-reflection member is arranged only on the viewer side, the following equation (2) must be satisfied in order to achieve an image contrast of 2 or more. {10000 × (r + × 4/100 × 0.9) +45} / {500 + 10000 (r + 4/100 × 0.9 × 0.9) +45} ≧ 2. . . Expression (2) From Expression (2), it was found that the reflectance of the antireflection member needs to be 1.3% or less.

Since the anti-reflection member is expensive, it is preferable to provide the anti-reflection member only on one side on the viewer side or the back side and to provide the anti-reflection member on the viewer side in order to reduce the cost of the display device. In order to increase the image contrast and further improve the quality of the image, as shown in FIG. 1, it is desirable to dispose it on both the viewer side and the back side.

Although the antireflection film is used as the antireflection member of this embodiment, a transparent substrate (glass plate, acrylic plate, etc.) on which an antireflection film is deposited, or a non-glare film can be used. . Further, an anti-reflection film and a non-glare treatment may be applied to the transparent substrate 13 and the cover film 12 provided for protecting the hologram 11, thereby forming an anti-reflection member.

The diffraction efficiency of the hologram 11 when the anti-reflection member is arranged on both the viewer side and the back side of the transmission type hologram screen 10 in this example and when the anti-reflection member is arranged only on the viewer side are shown. The required reflectance of the anti-reflection member with respect to the light amount of the projector used as the irradiation device 20 will be described.

The image brightness of the transmission hologram screen 10 can be expressed by the following equation. L = {K · η · (Q / S)} / ｛π · π (1-cos ²
θ)｝ L: Image luminance of hologram screen (cd / m ² ), η: Diffraction efficiency of hologram (%), Q: Light quantity of projector (lumen [lm]), Δθ: Half-width half-width (degree) of hologram, S : Image size of hologram screen (m ² ), K: Constant (0.1 for transmission hologram screen)
3). The half-width at half maximum of the transmission hologram screen 10 is determined by the viewing zone of the transmission hologram screen 10, and requires about 6 degrees.

Here, the image size of the transmission type hologram screen 10 is set to a diagonal length of 40 inches (image area of 0.5 m).
² ), and assuming that the image contrast of the image with respect to the noise light 411, 412, and 511 due to the background light on the viewer side and the background light on the back side is 2, the diffraction efficiency η of the hologram for each anti-reflection member having a different reflectance is obtained. The relationship between the light quantities Q of the projector is shown in FIGS.

FIG. 4 shows a case where anti-reflection members are used on both the viewer side and the back side, and FIG. 5 shows a case where anti-reflection members are used only on the viewer side. When the anti-reflection member is not used, for example, when using a projector of 600 lumens,
Although it is necessary that the hologram has a diffraction efficiency of 50% or more, it has been found that the minimum required hologram diffraction efficiency can be reduced by reducing the reflectance of the antireflection member.

When anti-reflection members are used on both the viewer side and the back side, and the reflectivity of the anti-reflection member is set to 0.4%, if the diffraction efficiency of the hologram is about 8% or more, the image quality can be set to an acceptable level ( It was found that the image contrast could be 2). In addition, anti-reflective members are used only on the viewer side,
It was found that if the hologram diffraction efficiency was about 32% or more when the reflectance of the antireflection member was set to 0.4%, an acceptable level of image (image contrast 2) could be obtained.

It is known that the price and cost of the anti-reflection member greatly depend on the reflectance of the anti-reflection member. Therefore, according to the diffraction efficiency of the projector used as the irradiation device and the transmission type hologram screen,
It has been found that by determining the reflectance of the antireflection member, the overall cost of the display device 1 can be reduced and the quality of the image can be made more favorable.

Further, assuming that the luminance of the first noise light due to the background on the viewer side is Nr and the transmission luminance of the second noise light due to the background on the back side is Nt, a projector for achieving the target image contrast. The light quantity and the diffraction efficiency of the hologram are represented by the following equations.

In the case of video contrast 2, “η · Q>
(Nr + Nt) · [{π · π (1-cos ² θ)} ·
S] / K ”. In the case of image contrast 3,
“Η · Q> 2 (Nr + Nt) · [｛π · π (1-cos
² θ)｝ · S] / K ”. The projector light amount and the hologram diffraction efficiency with respect to the required image contrast can be determined by the above two equations. This makes it possible to obtain a display device with a good image appearance.

Embodiment 2 In this embodiment, as shown in FIGS. 6 and 7, an antireflection member 15 is arranged on the viewer side of a transmission type hologram screen 10, and a polarizing optical element 16 is arranged on the back side. It is. Also,
A polarizing film or a polarizing plate is used as the polarizing optical element 16, and the transmittance of random light is 60%. In addition, the signal light 21 emitted from the irradiation device 2 in the display device 1 of the present embodiment is composed of linearly polarized light, and the direction of the linearly polarized light or the polarization optics is set so that the absorption axis of the polarization optical element 16 is orthogonal to the signal light 21. The type of the element 16 has been determined.

The transmission hologram screen 10 of this embodiment has a configuration in which the hologram 11 is sandwiched between the transparent substrate 13 and the cover film 12, but the cover film 12 is also used as the polarizing optical element 16, and the cover film 12 is It can be omitted.

The display device 1 according to the present embodiment can take measures against noise light both when the background 40 on the viewer side is particularly bright and when the background 50 on the back side of the transmission hologram screen 10 is particularly bright. it can.

The polarizing optical element 16 can greatly reduce the second noise light caused by the background on the back side and the first noise light caused by the background on the viewer side. That is, most of the randomly polarized light from the viewer's background passes through the inside of the transmission screen, but the intensity is greatly attenuated after passing through the polarizing optical element 16. The light that has not been absorbed is reflected by the outer surface 161 of the polarization optical element 16 to become the first noise light 412, but the intensity further decreases because the light passes through the polarization optical element 16 and reaches the viewer 4 after reflection. I do.

The light from the background side is also polarized by the polarization optical element 1.
6, the intensity of the second noise light is greatly reduced. In addition, since the signal light 21 from the irradiation device 20 is linearly polarized light and is arranged so as to be perpendicular to the absorption axis of the polarization optical element 16, the signal light 21 is hardly absorbed by the polarization optical element 16.

Therefore, according to this example, the first noise light and the second noise light are reduced, and most of the signal light from the irradiation device passes through the polarizing optical element, so that the display with a very high contrast of the image is displayed. A device can be obtained. Therefore, for example, in a case where the display device 1 is installed at a boundary between an indoor room and an outdoor room, the transmission hologram screen 10 is arranged outdoors, and the rear side of the transmission hologram screen 10 is an indoor room with very bright illumination. Can also provide images with high contrast.

Further, as shown in FIG. 7 described above, the display device 1 of the present embodiment has a configuration in which light reflected regularly on the outer surface 161 of the polarizing optical element 16 has the same direction as the signal light incident angle α.
Third noise light 3 due to (in the example of FIG. 7, sunlight)
02, light 3 incident from the direction opposite to the incident angle α of the signal light
The fourth noise light 312 due to 1 (in FIG. 7, the reflected light of sunlight on the ground) can also be reduced.
Other details are the same as in the first embodiment.

Embodiment 3 In this embodiment, as shown in FIG. 8, an antireflection member 14 is arranged on the viewer side of a transmission type hologram screen 10 and a polarization optical element 16 is arranged on the back side. The display device 1 further includes an antireflection member 15 disposed outside. The antireflection members 14 and 15 have a luminous reflectance of 0.8%.
Was used. Others are the same as in the first embodiment.

In this example, the maximum luminance of the background 40 on the viewer side is about 10,000 cd / m ² . Back side background 5
The maximum luminance of 0 is about 200 cd / m ² . As shown in FIG. 19, depending on the background 40 on the viewer side in the case where there is no anti-reflection member or the polarizing optical element, and in the case of the configuration of Embodiment 2 (see FIG. 6) and Embodiment 3 (see FIG. 8). Table 2 shows the contrast of the image luminance with respect to the first noise light and the second noise light due to the transmission of the background 50 on the back surface side. From the table, it was found that the configurations of the second and third embodiments can obtain higher contrast as compared with the configuration of FIG.

In the second embodiment, when a member having a reflectance of 2.5% is used as an anti-reflection member on the viewer side, the following equation (3) is required to achieve image contrast of 2 or more. Needs to be satisfied. {500 + 10000 (0.25 + 4 × t ² × 0.9 ² ) +200 t} / 1000 (0.025 + 4 × t ² × 0.9 ² ) ≧ 2. . . Equation (3) Here, t is a value obtained by dividing the transmittance (%) of the polarizing optical element by 100, and it is found that the transmittance of the polarizing optical element satisfying the equation (3) is 65% or less. .

In the third embodiment, when the antireflection member 15 provided outside the polarization optical element 16 has optical rotation (for example, in the case of a film with an antireflection film made of polyester), color unevenness is caused by optical rotation. Therefore, it is necessary to adjust the phase angle between the polarizing optical element 16 and the antireflection member 15 to an optimum angle (without color unevenness) in advance.

[0106]

[Table 2]

Embodiment 4 This embodiment is a display device 1 using a reflection type hologram screen 100 as shown in FIG. Display device 1 of this example
Has a reflection-type hologram screen 100 in which a reflection-type hologram 11 is sandwiched between a transparent substrate 13 and a cover film 12, and antireflection members 14 and 15 are arranged on both the viewer side and the back side. is there. In this example,
As in the first embodiment, the first noise light 411, 412 due to the viewer-side background 40, the second noise light 511 due to the back-side background can be reduced, and the display device 1 having image contrast can be obtained. it can. Others are the same as the first embodiment.

Embodiment 5 This embodiment is a display device using a reflection type hologram screen 100 as shown in FIG. Display device 1 of this example
Has a reflection type hologram screen 100 in which a reflection type hologram 11 is sandwiched between a transparent substrate 13 and a cover film 12, and has an antireflection member 14 on the viewer side and a semi-transparent or opaque optical element on the back side. This is a configuration in which a member 17 is arranged. Further, although a smoke film is used as the translucent or opaque optical member 17, a polarizing optical element can be used instead of the optical member 17. Further, instead of the transparent substrate 13, a semi-transparent or opaque substrate or a colored substrate may be arranged on the back side of the hologram 11, and this may function as the semi-transparent or opaque optical member 17. Others are the same as the fourth embodiment.

The image contrast according to the transmittance of the semi-transmissive optical member 17 was measured and is shown in Table 3. From the table, it was found that the lower the transmittance of the light-transmitting optical member 17 was, the higher the contrast of the image was.

[0110]

[Table 3]

Embodiment 6 As shown in FIG. 11, this embodiment is a display device in which a light control optical member is provided on a transmission hologram screen. In the display device 1 according to FIG. 11, a transmission type hologram screen 10 is sandwiched between a polarizing optical element 16 and a transparent substrate 13 in which the hologram 11 is also used as a cover film on the back surface. The anti-reflection member 15 is disposed on the light control optical member 18.

As shown in FIG. 11, the light control optical member 18 has a function of absorbing light in a specific incident angle range and transmitting light in the other range, and is surrounded by a line R. The outside is the absorption angle region, and the inside surrounded by the line R is the transmission angle boundary.

As shown in FIG. 11, consider the case where sunlight 30 and street lamps or the like directly enter the transmission hologram screen 10 from the absorption angle region of the light control optical member 18 in the display device 1 described above. If there is no light control member, the sunlight 30 is scattered inside the transmission hologram screen 10 as shown in FIG. 11, and the scattered light may reach the eyes of the viewer.

Further, this scattering is caused not only inside the transmission hologram screen 10 but also at the interface between the polarizing optical element 16 also serving as a cover film, the hologram 11, the transparent substrate 13, the antireflection member 15, and all other components (for example, An adhesive, an adhesive, a hot melt, etc. for joining the respective components are omitted in FIG. 11).

If the scattered light reaches the viewer and the intensity of the scattered light is further high, the whole screen appears cloudy, and the quality of the image may be greatly reduced. In this example, by providing the light control optical member 18,
By limiting the light incident on the transmission type hologram screen 10, the intensity of the scattered light is reduced, thereby preventing the screen from becoming cloudy. The above effects can be obtained similarly even when the light control optical member is provided on the reflection hologram screen.

Embodiment 7 In this embodiment, as shown in FIG. 12, a screen constituted by a transparent substrate having a visual field selection function will be described. As a transparent substrate having a visual field selection function that can be used for the screen 6 in the present example, for example, an angle 21 manufactured by Nippon Sheet Glass Co., Ltd., or Lumisty manufactured by Sumitomo Chemical Co., Ltd. is currently commercially available. Alternatively, the screen 6 can be formed from those in which these are adhered to a transparent substrate.

As shown in FIG. 12 (a), the screen 6 has a transparent viewing region 62 in a viewing range of a certain angle γ from the point O, and an opaque viewing region 61 in a range of an angle ρ greater than γ. Exists. In the display device of the present example, an irradiating device is arranged at a point A shown in FIG. 12B by using the opaque viewing area of the screen 6 and the signal light emitted from the irradiating device is scattered. Viewer 4
To provide video. The screen 3 of the present embodiment can be used as a transmission type or a reflection type, and can be used for both display devices.

The screen 6 shown in FIG.
As shown in (c), since the viewer sees the direction of point B through the screen 6, the second noise light due to the background on the back side of the display device is seen. In addition, since the screen 6 has a refractive index difference at the interface with air, surface reflection occurs and first noise light due to the background on the viewer side is generated. The first and second noise lights can be reduced by appropriately arranging an anti-reflection member or a polarizing optical element on the back side of the screen 6 or the viewer side as in the first to fifth embodiments.
A display device using the screen 6 and having high image contrast can be obtained.

Eighth Embodiment This embodiment is a display device comprising a transmission hologram screen formed by laminating a hologram 11 with a material having a visual field selection function. As shown in FIG.
In the transmission type hologram screen 10 of this example, a visual field selection functional material 65 made of a film-like Lumisty manufactured by Sumitomo Chemical Co., Ltd. is adhered to the hologram 11, and a transparent substrate 13 is arranged on the opposite surface. An anti-reflection member 14 is disposed on the viewer side of the transparent substrate 13, and an anti-reflection member 15 is disposed on the back side of the visual field selection function material 65 via a polarizing optical element 16.

With such a configuration, the field-of-view selection function material 65 increases the scattered diffraction intensity of the signal light 21 emitted from the irradiation device 20, so that the image brightness can be improved. Others have the same effects as the first to fifth embodiments.

Embodiment 9 This embodiment is, as shown in FIG. 14, a display device comprising a transmission hologram screen. As shown in FIG. 14, the transmission type hologram screen 10 of the present example has a hologram 11
Are laminated, an antireflection member 14 is disposed on the viewer side via a transparent substrate 13, and a polarization optical element 16 is disposed on the back side. With such a configuration, the scattered diffraction intensity of the signal light 21 is increased, and the image brightness can be improved. Others have the same effects as the first to fifth embodiments.

Embodiment 10 As shown in FIG. 15, this embodiment is a display device including a transmission hologram screen. As shown in FIG. 15, an antireflection member 14 is provided on the viewer side of the hologram 11.
And a transmission hologram screen 10 in which a polarizing optical element 16 is arranged on the back side and a transparent substrate 13 is arranged outside the polarizing optical element 16.

By adopting such a configuration, in a configuration using an anti-reflection member on the viewer side and a polarizing optical element on the back side, it can be integrated with anything other than the transparent substrate 13 and has an integrated configuration. Can be installed on a transparent substrate 13 such as an existing show window. Others are the first to third embodiments.
5 has the same function and effect.

Embodiment 11 This embodiment is, as shown in FIG. 16, a display device comprising a transmission hologram screen. As shown in FIG. 16, a hologram 11 and a transmission hologram screen 10 in which an antireflection member 14 is arranged on the viewer side of the hologram 11 and a polarizing optical element 16 is arranged on the back side of the hologram 11 are shown. Have.

With such a configuration, the transparent substrate can be eliminated and a film structure can be obtained.
By using a film structure, the screen can be stored in a roll shape, folded, or used in a curved shape. Further, it has the same operation and effects as those of the first to fifth embodiments.

Embodiment 12 As shown in FIG. 17, this embodiment is a display device including a transmission type hologram screen. As shown in FIG. 17, this is a transmission plate in which an antireflection member 14 is arranged on the viewer side of a transparent substrate 13 and a 波長 wavelength plate 191 is arranged on the back side of the hologram 11 attached to the transparent substrate 13. A hologram screen 10. The signal light 21 of the irradiation device 20 in the display device is circularly polarized.

The signal light that is circularly polarized light has little reflection on the surface of the quarter-wave plate, and is converted into S-polarized light by transmitting through the quarter-wave plate. The diffraction intensity of the hologram 11 is higher when the circularly polarized light or the P-polarized light is compared with the S-polarized light, so that the image intensity can be improved. Therefore, the image contrast is improved, and the appearance of the image is improved.

As another form of the present example, as shown in FIG.
2 is arranged. The signal light 21 of the irradiation device 20 in the display device is P-polarized light.

As a result, the P-polarized signal light 21 becomes 1
When the light enters the half-wave plate 192, the reflectance of the P-polarized light is small, so that the light is hardly reflected and can travel to the hologram 11 without reducing the intensity of the signal light 21. Further, by transmitting through the half-wave plate 192, the signal light 21 which is P-polarized light is converted into S-polarized light. Then, when comparing the diffraction intensity of the hologram 11 between the S-polarized light and the P-polarized light, the image intensity can be increased because the diffraction intensity of the S-polarized light is higher. Therefore, the appearance of the video is improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a display device using a transmission hologram screen in which antireflection members are provided on both surfaces according to a first embodiment.

FIG. 2 is a diagram showing an optical system in a hologram exposure process according to the first embodiment.

FIG. 3 is a scatter diagram showing the relationship between the contrast of an image and the appearance of the image according to the first embodiment.

FIG. 4 is a diagram showing the relationship between the projector light amount and the hologram diffraction efficiency when the anti-reflection members of the first embodiment are provided on both sides.

FIG. 5 is a diagram showing a relationship between a projector light amount and a hologram diffraction efficiency when the antireflection member according to the first embodiment is provided only on the viewer side.

FIG. 6 is a system configuration diagram of a display device using a transmission hologram screen provided with an antireflection member and a polarizing optical element according to a second embodiment.

FIG. 7 is an optical path diagram showing another effect of the second embodiment.

FIG. 8 is a system configuration diagram of a display apparatus using a transmission hologram screen provided with two antireflection members and a polarizing optical element according to a third embodiment.

FIG. 9 is a system configuration diagram of a display device using a reflection hologram screen in which antireflection members are provided on both surfaces according to a fourth embodiment.

FIG. 10 is a system configuration diagram of a display device using a reflection hologram screen provided with an antireflection member and a polarizing optical element according to a fifth embodiment.

FIG. 11 is a system configuration diagram of a display device using a transmission hologram screen provided with a light control optical member according to a sixth embodiment.

FIG. 12 is an explanatory diagram showing a screen constituted by a transparent substrate having a visual field selection function according to a seventh embodiment.

FIG. 13 is a system configuration diagram of a display device using a transmission hologram screen on which a material having a visual field selection function according to an eighth embodiment is arranged.

FIG. 14 is a system configuration diagram of a display device using a transmission hologram screen configured by stacking three holograms according to a ninth embodiment.

FIG. 15 is a system configuration diagram of a display device using a transmission type hologram screen in which a transparent substrate is disposed outside the polarizing optical element of Embodiment 10;

FIG. 16 is a system configuration diagram of a display device using a transmission hologram screen including only a hologram, an antireflection member, and a polarizing optical element according to Embodiment 11;

FIG. 17 is a system configuration diagram of a display device using a transmission hologram screen in which a quarter-wave plate according to Embodiment 12 is arranged.

FIG. 18 is a system configuration diagram of a display device using a transmission hologram screen in which a half-wave plate according to a twelfth embodiment is arranged.

FIG. 19 is an explanatory diagram showing optical paths of signal light and noise light in a conventional display device using a transmission hologram screen.

FIG. 20 is an explanatory diagram showing optical paths of signal light and noise light in a conventional display device using a reflection hologram screen.

[Explanation of symbols]

 1. . . Display device, 10. . . Transmission hologram screen, 100. . . Reflection hologram screen, 14, 15. . . Anti-reflection member, 16. . . Polarizing optical element, 17. . . 19. a translucent optical member; . . Irradiation device, 21. . . Signal light, 40, 50. . . Background, 4. . . Audience,

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI G03B 21/62 H04N 5/74 C H04N 5/74 G02B 1/10 A

Claims (17)

[Claims] 1. A display device comprising: an irradiating device that emits signal light on which display information is recorded; and a transmission screen that transmits the signal light incident from the irradiating device toward a viewer. Both sides of the viewer's side and back side,
Alternatively, a display device in which an anti-reflection member is disposed on only one of the display devices. 2. An irradiation device for emitting signal light on which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiation device toward a viewer, wherein the signal light is linearly polarized light. A display device, characterized in that a polarizing optical element is disposed on the back side of the transmission screen, and the polarizing optical element is configured to selectively transmit the linearly polarized light. Display device. 3. An irradiation device for emitting signal light on which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiation device in the direction of a viewer, wherein the signal light is linearly polarized light. A display device, wherein a polarizing optical element is disposed on the back side of the transmission screen, and the polarizing optical element is configured to selectively transmit the linearly polarized light. A display device, wherein an antireflection member is disposed outside the element. 4. An irradiation device for emitting signal light on which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiation device toward a viewer, wherein the signal light is linearly polarized light. In a display device, an antireflection member is disposed on a viewer side of the transmission screen, and a polarizing optical element is disposed on a rear surface side of the transmission screen. , A display device configured to selectively transmit the linearly polarized light. 5. An irradiation device for emitting signal light on which display information is recorded, and a transmission screen for transmitting the signal light incident from the irradiation device toward a viewer, wherein the signal light is linearly polarized light. In a display device, an antireflection member is disposed on a viewer side of the transmission screen, and a polarization optical element is disposed on a rear surface side of the transmission screen. A display device configured to selectively transmit the linearly polarized light, and further comprising an antireflection member disposed outside the polarization optical element. 6. A display device comprising: an irradiating device that emits signal light on which display information is recorded; and a reflective screen that reflects the signal light incident from the irradiating device toward a viewer. Both sides of the viewer's side and back side,
Alternatively, a display device in which an anti-reflection member is disposed on only one of the display devices. 7. A display device comprising: an irradiating device that emits signal light on which display information is recorded; and a reflective screen that reflects the signal light incident from the irradiating device toward a viewer. A display device, wherein a semi-transmissive or opaque optical member or a polarizing optical element is arranged on the back side of the display device. 8. A display device comprising: an irradiating device for emitting signal light on which display information is recorded; and a reflective screen for reflecting the signal light incident from the irradiating device toward a viewer. A display device, wherein an anti-reflection member is disposed on the viewer side, and a semi-transmissive or opaque optical member or a polarizing optical element is disposed on the back side of the reflective screen. 9. The method according to claim 1, wherein:
The display device, wherein the transmission screen is a transmission hologram screen. 10. The display device according to claim 6, wherein the reflection type screen is a reflection type hologram screen. 11. The display device according to claim 1, wherein an image contrast of the display device is 2 or more. 12. The luminous reflectance of the anti-reflection member according to claim 1, wherein the luminous reflectance is 2.
A display device characterized by being at most 5%. 13. The display device according to claim 2, wherein the transmittance of the polarizing optical element is 65% or less. 14. The display device according to claim 1, wherein the antireflection member is a glossy antireflection member. 15. The display device according to claim 1, wherein the anti-reflection member is a non-glare anti-reflection member. 16. The anti-reflection member according to claim 1, wherein the anti-reflection member has glossy anti-reflection performance and non-glare performance. A display device, which is a member. 17. The method according to claim 1, wherein the transmission type screen or the reflection type screen and the antireflection member on the viewer side are provided between the transmission type screen or the reflection type screen and the viewer side antireflection member.
A display device comprising a light control optical member.