JPS6336510B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmissive display device based on a new principle that electrically controls the substantial transmittance of external light and displays numbers, characters, figures, images, etc. directly.

A membrane or plate-shaped porous body made of a light-transmitting dielectric material and having a large number of fine openings exposed on at least one surface; means for applying a voltage to a composite body including a translucent liquid material that imparts translucency to the body, and the movement of the liquid material to the porous body in response to the voltage reduces the The present inventors have already proposed a display device in which external light transmitted through the composite is controlled by controlling the liquid impregnation rate of the surface portion having the fine openings.

The porous body preferably has a large number of micropores that substantially penetrate from one surface to the other surface, and also has a light-transmitting dielectric material that is almost the same as the light-transmitting dielectric material forming the porous body. By impregnating the porous body with a translucent liquid material having a refractive index, translucency can be substantially imparted to the porous body.

It is desirable that the composite consisting of a porous body impregnated with a translucent liquid material be held on a translucent support. It is desirable that the opposite side to the light-transmitting support faces an open space, and the fine openings described above are located on the surface of the porous body on this side so as to be exposed to the open space. Furthermore, it is preferable that a plurality of dots, short fences, linear depressions, etc., including a large number of the above-mentioned openings, are provided on the surface of the porous body.
Note that the surface of the porous body, except for the depressed portions, can be selectively made opaque by applying black ink, conductive ink, or the like.

The voltage is applied to the composite by installing one or more pairs of electrodes, at least one of which is transparent, on the composite installation surface of the transparent support, and applying a voltage between the electrodes. Apply. Alternatively, a light-transmitting electrode is provided on the composite installation surface of the light-transmitting support, and a liquid-permeable light-transmitting electrode is provided on the opposite surface of the porous body, or selectively except for the recessed portion. An electrode may be installed by applying conductive ink or the like, and a voltage may be applied between the electrode and the translucent electrode.

The translucent liquid material causes electroosmosis in the porous body in response to the applied voltage, and when the opening on the surface of the porous body on the open side is impregnated with liquid, the degree of light scattering in this area is controlled. .

In this type of display device, the translucent liquid material is about 1
It has the characteristics of being able to perform effective light scattering with extremely small movements of microns, and highly sensitive external light modulation. However, in order to display the light as a shade of light, it is necessary to project it onto a screen using a lens or the like. That is, although it is useful as a transmission projection type display device, as a so-called direct display type display device, the shading is not clear and there is room for improvement.

In view of the above, an object of the present invention is to provide a useful transparent direct-view display device, which has been difficult to achieve in the past.

The principle of the present invention is that, in the above-mentioned display device, an auxiliary body is installed on one side of the composite body, separated from the composite face, and a gap between the composite face and the auxiliary body is provided. means for obliquely irradiating external light onto the surface of the composite body through the composite body, and means for preventing reflected light from the auxiliary body of the external light from transmitting through the composite body to the viewing surface. A transmissive display device is provided.

Hereinafter, aspects of the present invention will be described in detail with reference to Examples.

FIG. 1 is a diagram showing a vertical cross-sectional structure and a power supply system of an embodiment of a transmissive display device according to the present invention. For convenience of explanation, all parts of the same type are indicated by the same number, and each part is appropriately enlarged, so the relative dimensions thereof do not necessarily correspond to the description in the main text.

In the figure, 100 is a complex, and an open space 20
A large number of micropores 11 having openings exposed at 0
1 and a translucent liquid material 120 impregnated therein.
The porous body 110 is constituted by a so-called microporous membrane filter made of a transparent light-transmitting dielectric material such as nitrocellulose or complex acid cellulose. The filter may be, for example, 40 to 200 microns thick, substantially penetrating from one surface to the other, and have an average pore size of 0.1 to 1
It is preferable to have micropores with openings on both sides and a porosity of about 50 to 80%. The translucent liquid material 120 is selected to have the same or approximately the same refractive index as the translucent dielectric material forming the porous body 110 in order to impregnate the porous body 110 and impart translucency. , a transparent liquid material is selected that exhibits good electroosmotic properties for the porous body 110. When the porous body 110 is made of nitrocellulose (light refractive index nd=1.51) as described above, for example,
Dimethyltriphenyltrimethoxysiloxane exhibiting nd=1.51 is preferred. The porous body 110 is
For example, in the case of cellulose complex acid (nd=1.47), the liquid material 120 is preferably a mixture of methacryloxy propyl trimethoxy silane and α-methylnaphthalene mixed so that nd=1.47.

In the configuration shown in FIG. 1, a microporous membrane of nitrocellulose is used as the porous body 110.
Dimethyl as the filter and liquid material 120
Triphenyl←→trimethoxy←→siloxane is preferred. For example, the surface of the porous body 110 has a thickness of 80 mm.
Electrodes 131 and 132 made of cuprous iodide, which are extremely thin liquid-permeable and translucent on the order of Å, are deposited. The composite 100 is held on a support 300 made of a transparent glass plate having a transparent electrode 310 made of tin oxide or the like coated on its surface. The electrode 131 and the electrode 310 are kept at equal potential by a conductive wire 141,
Electrode 132 and electrode 300 are connected to DC power supply V _B by conductor 142, and electrode 310 is connected to electrode 1
A negative voltage is applied to 32. Reference numeral 400 denotes an auxiliary body consisting of a light absorber 420 made of a support 410 such as a plastic plate covered with black paint, black cloth, etc., and is made large enough to protrude from the composite body 100 which has a two-dimensional extent. 300, for example, at a distance of about 10 to 50 mm.

510 and 520 are illumination light sources (dedicated light sources) made of fluorescent lamps, etc.
Synchrotron radiation (dedicated light) through the gap 600 with 00
The complex 100 is uniformly irradiated obliquely by L ₁ . Note that a light shielding plate 320 is provided to avoid light incident L ₁ ″ at an unnecessary angle of incidence that narrows the viewing field of display.

Since the electrode 310 is at the same potential as the electrode 131, no voltage is applied to the composite 100. Therefore, the dielectric material forming the porous body 110 is replaced by the liquid material 120 having approximately the same refractive index.
is impregnated with the liquid material 120, and even the surface facing the open space 200 is impregnated with the liquid material 120 by capillary action. Therefore, the composite 100 has almost no non-uniformity in refractive index and is transparent. Therefore, the obliquely incident light L ₁ passes through the composite body 100 as it is, becomes obliquely transmitted light L _2T , and does not enter the observation surface 210. On the other hand, the irradiation light L ₁ ' from the light sources 510 and 520 to the auxiliary body 400 is absorbed by the light absorber 420. Therefore, the reflected light is transmitted to the electrode 131.
Observation surface 2 passes through the composite exhibiting a transparent state.
10 can be prevented.

Therefore, when viewing the electrode 131 section from the observation surface 210, the observer can see the auxiliary body 40 through the transparent composite.
0 black light absorber 420 is seen, and black can be displayed in this portion. On the other hand, in a portion where a negative voltage is applied to the electrode 310 with respect to the electrode 132 by the DC power supply V _B , the liquid material 120 causes electroosmosis in the porous body 110 in the direction of the negative electrode.

The liquid material 120 moves from the open space 200 toward the negative electrode 310 by electroosmosis against surface tension and capillarity, and the excess liquid material 120 is moved into the installation gap between the composite 100 and the electrode 310. run away. In this way, the liquid impregnation rate of the surface portion of the porous body 110 facing the open space 200 is reduced, and air enters the micropores 111 having openings in this portion, as illustrated in the figure. Therefore, the dielectric material (nd=1.47) forming the porous body 110 and the air (nd=1) inside the micropores 111 are no longer matched in refractive index due to the intrusion of air into the micropores 111 in this surface area. cannot be obtained. Therefore, open space 20
The portion of the electrode 132 facing 0 forms a diffusing surface that diffusely reflects and refracts the obliquely incident incident light _L1 . In this way, as illustrated in the figure, the irradiated light does not reach the surface of the porous body 100 that has an opening in the open space 200 that has the electrode 132.
L ₁ is diffusely reflected and refracted to produce diffusely transmitted light L _2S ,
The direction component illustrated by the inner dotted line is the observation surface 210
It can be observed as white.

The degree of whiteness increases as the degree of liquid impregnation of the surface of the composite 100 decreases, that is, as the degree of electroosmosis increases. Electroosmoticity increases with the amplitude of the power supply _VB . Therefore, the whiteness can be controlled in accordance with the amplitude of the DC voltage, and halftones can be displayed. When the DC voltage is reduced to zero potential, the liquid material 120 instantly returns to the surface due to its surface tension and capillary action based thereon, forming a transparent state similar to the electrode 131 portion. Therefore, when observed from the observation surface 210, the electrode 131 is displayed black, and the electrode 132 is displayed white in accordance with the amplitude of the DC power supply V _B , making it possible to configure a transmissive type and direct view type display device.

Above, in order to explain the principle of operation, the liquid-permeable electrodes are limited to two types, 131 and 132, but it is possible to provide multiple types of liquid-permeable electrodes with desired shapes and selectively apply a DC voltage. For example, letters, numbers, shapes,
Direct-view transmissive display that can also display images in black and white in halftones is possible.

In the present invention, the light absorption degree by the auxiliary body 400 is an important factor affecting the contrast ratio in transmissive display. That is, light reflection from the auxiliary body 400 causes a decrease in display contrast ratio. In order to further reduce this light reflection, the support 410
be made of a light reflector such as metal, glass, or a plastic plate, or a metal reflective film 430 such as a metal vapor-deposited film of aluminum is formed on the surface of these supports 410 as indicated by dotted lines in the figure, and a light absorber is formed. 420, an improvement can be achieved by installing a circularly polarizing plate with a 1/4 wavelength retardation plate. Preventing light reflection by such a combination of a reflective surface and circularly polarized light is effective in improving display contrast ratio.
Note that in this example, the observation was made from the open space 200 side, but the light shielding plate 320, the illumination light sources 510, 520, and the auxiliary body 400 are provided on the open space 200 side, and the support body 3
The display can be observed from the 00 side.

FIG. 2 is a vertical cross-sectional structural view and a power supply system of another embodiment of a transmissive display device according to the present invention. In the figure, on the surface of a support 300 made of a transparent glass plate or the like, there are electrodes 311 made of a conductive film made of tin oxide or the like and having a width of about 100 microns and coated with a black paint 312 on the surface. Display electrodes 133 and 133' made of a transparent conductive film and having a width of about 500 to 2000 microns are alternately deposited adjacent to each other with a gap of, for example, about 50 microns. On top of this, a composite 100 is placed, in which a porous body 110 made of the aforementioned microporous membrane filter having a thickness of about 100 microns is impregnated with the aforementioned liquid material 120. porous body 110
On the surface facing the open space 200, the average aperture in the surface portion is about 15 to 30 microns so as to include a large number of the micropores 111, and the depth is set to improve the display contrast ratio. A conical or truncated dot-like recessed portion 112 with a diameter of 10 to 25 microns and an average diameter of 3 microns or less at the tip is located at a position corresponding to the display electrode 133 at a rate of 200 microns per inch.
They are set at a density of ~400 points. The irradiation light sources 510 and 520 are provided on the open space 200 side, unlike the example in _FIG .
It is configured to be obliquely incident on 00. 320
400 is the light shielding plate that prevents unnecessary irradiation, and 400 is the incident light.
It is an auxiliary substance that absorbs L ₁ ′ and prevents reflection. The auxiliary body 400 includes a light absorber 420 and a support plate 410. When the polarizing plate 600 is a linear polarizing plate, one configuration of the light absorber 420 is to provide a linear polarizing plate. In this case, it is installed so that it has a linear polarization axis that is preferably perpendicular to the linear polarization axis of the entrance hole L ₁ ' that passes through the polarizing plate 600.

Another configuration is that the polarizing plate 420 is a circularly polarizing plate having a linearly polarizing filter and a quarter wavelength phase plate, and the polarizing axis of the linearly polarizing filter of the polarizing plate 420 is set to be preferable for the directly polarized incident light L ₁ ′. or perpendicular to each other. In this case, the support plate 410 that supports the circularly polarizing plate 420 can be made light reflective in the same manner as described with reference to FIG. 1, and the light absorption can be further improved.

As described above, when 420 is a circularly polarizing plate, the polarizing plate 600 can also be a circularly polarizing plate. In this case, when one of 420 and 600 is made to have right-handed rotation, the left one is made to be a left-handed circularly polarizing plate to impart light absorption properties.

The electrode 111 is connected to a DC power source via a conductor 145.
The display electrode 133 is commonly connected to one terminal of V _B1 and V _B2 , and the display electrode 133' is connected to the negative terminal of the DC power supply V _B1 via a conductor 143.
4 to the positive polarity terminal of the DC power supply V _B2 . When viewed from the viewing surface 210, the electrode 311 always appears black due to the presence of the black paint 312. Further, in the display electrode 133 portion to which a suitably large negative voltage is applied to the electrode 312, the liquid material 120 electro-osmoses into the porous body 110 in the direction of the negative electrode, as described above. Therefore, in the portion corresponding to the display electrode 133, the adjacent electrode 3
The liquid material 120 moves from the portion corresponding to 11, as illustrated by the dotted arrow in the figure. In this way, the porous body 1 corresponding to the display electrode 133
10, the impregnation density of the liquid material 120 increases, as illustrated by the point density in the figure, the degree of liquid impregnation of the surface facing the open space 200 increases, and the dot-like depressions 112 are completely filled with liquid material. Filled with 120. In this state, the composite 100 is in a transparent state,
The obliquely incident illumination light L ₁ passes through the composite body 100 as L _2T , and L _2T does not enter the observation surface 210.
From the viewing surface, the polarizing plate 420 is directly viewed through the transparent composite 100. As described above, the incident light L ₁ ' on the polarizing plate 420 is absorbed by the polarizing plate 420 and its reflection is prevented. In this way, the portion of the display electrode 133 is transparently displayed in black.

On the other hand, in the display electrode 133' to which a positive voltage is applied to the adjacent electrode 311, the liquid material 120
is electroosmotic in the direction of the negative polarity electrode 311, and the liquid impregnation rate of the surface facing the open space 200, including the dotted depressions 112 of the porous body 110 at the position corresponding to the display electrode 133', decreases. A mismatch of refractive index within the micropores of the porous body 110 similar to that described in FIG. 1 occurs. Therefore, oblique irradiation light
L ₁ causes diffused reflection and diffused refraction on the surface of this porous body 110. In particular, the diffused reflection and diffused refraction on the side slopes of the dotted depressions 112 are significant, resulting in transmitted diffusely refracted light _L2S as illustrated in the figure. On the observation surface 210, the portion corresponding to the display electrode 133' can be observed as white much more effectively than in the case of FIG. V _B1 , V _B2
By reversing the voltage polarity of the display electrode 133, the display electrode 133 changes from black to the white state of the display electrode 133';
3' changes from white to the white state of the display electrode 133. Therefore, by configuring one or more of the display electrodes 133, 133', etc. into a desired shape and selectively applying a positive or negative voltage to these, a transparent display such as a black and white pattern can be performed. be able to.

Note that the illumination sources 510 and 520, the light blocking plate 32
0, the polarizing plate 600 and the auxiliary body 400 can be provided on the side of the support body 300 opposite to that shown in the figure, and the open space 200 side can be used as the observation surface 210.

FIG. 3 is a diagram showing a vertical cross-sectional structure and a power supply system of another embodiment of a transmissive display device according to the present invention. In the figure, the porous body 110 is the aforementioned microporous membrane filter, the liquid material 12
The materials described above are also used to form composite 100. Porous body 110 facing open space 200
As in the case of FIG. 2, a plurality of dot-like recesses 112 are provided on the surface of the display panel 112 corresponding to the patterns to be displayed. What is different is the dotted depression 1
The black ink 700 is applied to the surface of the porous body 110 leaving the area 12 and is configured to be opaque, and in contrast to the shape of the pattern to be displayed, the black ink 700 is applied onto the surface of the opaque ink 700 leaving the dotted depressions 112. Mutually insulated display electrodes 134 and 135 made of graphite, conductive paint, etc. are formed by coating, and are configured to effectively utilize light scattering and refraction on the side slopes of the dotted depressions. This is what is happening. The composite body 100 is supported on an electrode 310 made of a transparent conductive film such as tin oxide, which is adhered to the surface of a support 300 such as a transparent glass plate. The electrode 310 is a conductive wire 145, and the display electrodes 134 and 135 are each a conductive wire 1.
46, 147 to the power supply V _B3 , and is configured such that a positive or negative DC voltage is selectively applied to the display electrodes 134, 135 with respect to the electrode 310. The light absorber 420 is a linear polarizing plate, 511,
Reference numeral 521 denotes a reflecting mirror that reflects light emitted from the irradiation light sources 510 and 520 to the rear surface to increase light efficiency. 61
0 is a linear polarizing plate arranged so that its polarization axis is orthogonal to 420. In the figure, a state in which a negative voltage is applied to the display electrode 134 and a positive voltage is applied to the display electrode 135 with respect to the electrode 310 is illustrated.

With the material configuration described above, the liquid material 120 is electroosmotic toward the negative electrode. Therefore, on the surface to which the display electrode 134 is adhered, the liquid material 120 electropenetrates the porous body 110 toward the open space 200 surface, and the dotted depressions 11
Fill in 2. Therefore, this part becomes transparent, and as illustrated in the figure, the illumination light sources 510, 520
The obliquely irradiated light L ₁ from the polarizing plate 610 produces transmitted light L 2 T from the dotted depressions 112, or
It is absorbed by the black ink 700 and does not reach the observation surface 210. On the other hand, the irradiation light to the polarizing plate 420
L ₁ ′ receives linearly polarized light and produces reflected light L ₁ ′ _R ,
Direct polarizing plate 6 having a polarization axis perpendicular to this polarized light
10, the transmission is blocked and cannot reach the viewing surface 210.

Therefore, a black display can be performed in the portion where the display electrode 134 is attached. On the other hand, in the adhered portion of the display electrode 135 to which a positive voltage is applied, the liquid material 120 electropenetrates in the direction of the electrode 310, which is the negative electrode, and the liquid impregnation rate of the side slope of the dotted depression 112 decreases, causing the porous Due to its nature, it exhibits a rough surface, resulting in the above-mentioned irregularity in refractive index.

Therefore, the obliquely irradiated light L ₁ is refracted randomly on the side slope,
Diffuse reflection occurs, producing diffusely transmitted light L _2S , which appears white on the viewing surface. A microporous membrane filter of cellulose acetate (nd = 1.47) with a thickness of 120 microns, an average pore diameter of 0.3 microns, and a porosity of 80% is used as the porous body 110, and the dotted depressions 112 are formed with an average diameter of 20 microns and a depth. Shape of a truncated cone with a diameter of 15 microns and an average tip diameter of 3 microns or less, arrangement density - 200 pieces per inch, liquid material 12
0 is a transparent mixed liquid of methacryloxypropyltrimethoxysilane and μ-methylnaphthalene (nd
1.47), when using polarizing plates 420 and 610 with an orthogonal transmittance of 1/60, a black and white display with a response time constant of about 30 milliseconds and a contrast ratio of 1:30 was possible at an applied voltage of ±70 volts.

In addition, in FIG. 3, since it is sufficient to block the polarized reflected light L ₁ ' _R transmitted to the observation surface 210, the linear polarizing plate 610 is connected to the composite body 100 and the observation surface, as illustrated by a dotted line 610' in the figure. It may be placed between 210 and 210. In addition, the polarizing plate 610 does not come into close contact with the support 300 as shown in the figure, and the irradiation light L ₁
It can also be installed at a distance from the surface of the support 300 as long as it can pass therethrough. The light absorber 420 can be a circularly polarizing plate by making the support 410 light reflective. In this case, the reflected light L ₁ ' _R can be blocked by using linear polarizing plates as the polarizing plates 610, 610'. In addition, 6
10 or 610', these are circularly polarizing plates with a different polarization rotation from the circularly polarizing plate 420, and the reflected light L ₁ ' _R can be blocked.

FIG. 4 is a simplified plan view showing the configuration of still another embodiment of a transmissive display device according to the present invention.

This example relates to an oblique irradiation method to the composite 100, and in the above embodiments, oblique irradiation was performed from two opposing directions. However, as illustrated in the figure, when the complex 100 is square, a stick or linear light source 530, 540 such as a fluorescent lamp is newly used to irradiate diagonally from the other opposing side as shown by the arrow. can do.

This method is suitable when the depressions 112 are in the form of dots as described above, and is extremely useful for displaying uniform high brightness over the entire surface. Of course, in this case, it may be done by arranging a plurality of point light sources such as miniature light bulbs, or in special cases, the light source may be limited to a single point, bar, or linear irradiation source and irradiated from one direction. It shall also be possible to do so.

FIG. 5 is a plan view of another embodiment of the transmissive display device according to the present invention.

The dotted depressions 112 in FIG. 3 are, for example, linear depressions 112' as illustrated in the figure, in which the width of the opening is 25 to 50 microns, the depth is 20 to 50 microns, and the width of the tip is within 3 microns. Furthermore, it can also be configured with a short fence-like recessed portion 112''.

In this way, when there is a depressed portion extending in one direction, the depressed portions 112' and 11 extending in one direction are
It is desirable to select the position of the irradiation light source so that the oblique irradiation light _{L 1} hits the side slope of 120' and 120'' so as to intersect with the side slope of 120' and 120'. The intersection angle at the projection plane is approximately 90 degrees, while the light source 570
The oblique irradiation light L _1P from is parallel to the extending direction of 120' and 120'', that is, the intersection angle is 0°.

The former has a higher light utilization rate than the latter and is suitable for high-intensity display, and it is desirable that the oblique irradiation light be irradiated at least at an angle that intersects the side slope of the depression.

As described above, in the present invention, an auxiliary body is installed on one side of a composite body, separated from this composite face, and the auxiliary body is installed on one side of the composite body, and the auxiliary body A transmissive display device having a means for obliquely irradiating external light onto the display device, and a means for preventing reflected light from the auxiliary body from transmitting the external light to the observation surface via the composite body. In a display device that utilizes the electroosmosis phenomenon in a composite, it has achieved transparent direct-view display, which was previously difficult, and has the advantage of being able to easily create a wide-screen display device, as well as high brightness and high contrast ratio. It is extremely useful industrially as a new display device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a longitudinal cross-sectional structure and power supply system of one embodiment of a transmissive display device according to the present invention, and FIG. 2 is a longitudinal cross-sectional view of another embodiment of a transmissive display device according to the present invention. FIG. 3 is a diagram showing the vertical cross-sectional structure and power feeding method of yet another embodiment of a transmissive display device according to the present invention, and FIGS. 4 and 5 are diagrams showing the power feeding method according to the present invention. FIG. 7 is a plan view of the configuration of other embodiments of such a transmissive display device. 100...Composite, 110...Porous body, 11
1... Micropore, 112, 112', 112''... Concave portion, 120... Liquid material, 131, 132, 1
33, 133', 134, 135...electrode, 20
0...Open space, 210...Observation surface, 300...
Support body, 310... Electrode, 400... Auxiliary body, 4
10...Support, 420...Light absorber, 510,
520, 530, 540, 550, 560, 57
0...Irradiation light source, 600, 610, 610'...
Polarizing plate, 700...Black ink, L ₁ , L ₁ ', L _1P ...
...Irradiation light, L _2T , L _2S ...Transmitted light, V _B , V _B1 , V _B2 ,
V _B3 ...Power supply.

Claims (1)

[Scope of Claims] 1. A film or plate-shaped porous body made of a light-transmitting dielectric material and having a large number of fine openings exposed on at least one surface, and a composite body including a translucent liquid material impregnated with the porous body and having a refractive index substantially equal to that of the porous body; and means for applying a voltage to the composite body; In a display device in which the liquid impregnation rate of at least a surface portion of the porous body having the opening is controlled by movement relative to the porous body, and light transmitted through the composite body is controlled, one of the composite bodies An auxiliary body is installed on the surface side of the composite body to be isolated from the composite surface, and a dedicated light source has means for diagonally irradiating dedicated light onto the composite surface through a gap between the composite surface and the auxiliary body. A transmissive display device, further comprising means for preventing the reflected light from the auxiliary body for the dedicated light from transmitting through the composite body to the viewing surface. 2. The transmissive display device according to claim 1, wherein the auxiliary body is a black light absorber. 3. The transmission type display device according to claim 1, wherein the auxiliary body is a light reflection prevention body provided with a light reflector and a circularly polarizing plate. 4. In the transmission type display device according to claim 1, the auxiliary body is a linearly polarizing plate, the dedicated light is linearly polarized light transmitted from a dedicated light source through a linearly polarizing element, and the linear A transmissive display device, wherein the polarization axis of the linearly polarized light incident on the polarizing plate is perpendicular to the polarization axis of the linearly polarizing plate. 5. In the transmission type display device according to claim 1, the auxiliary body is a circularly polarizing plate, the dedicated light is circularly polarized light transmitted from a dedicated light source through a circularly polarizing element, and the circularly polarized light is In plates and elements,
A transmissive display device characterized in that one of them has right-handed polarization while the other has left-handed polarization. 6. In the transmission type display device according to claim 1, the auxiliary body is a first linearly polarizing plate, and the second linearly polarizing plate is arranged such that the polarizing plate and the polarization axis are perpendicular to each other. , installed on either one side of the composite body or the other side of the composite body, away from the first linearly polarizing plate, and the dedicated light irradiated obliquely is placed on the composite body. 1. A transmissive display device, characterized in that the display device is configured to transmit light through the main body and the second linearly polarizing plate. 7. In the transmission type display device according to claim 1, the auxiliary body is a first circularly polarizing plate,
A second polarizing plate is installed on either one side of the composite or the other side of the composite, apart from the first circularly polarizing plate, and A transmission type display device characterized in that one of the plates is a circularly polarizing plate that rotates to the right and the other rotates to the left, and the dedicated light that is irradiated obliquely is configured to pass through the second circularly polarizing plate. . 8. In the transmissive display device according to any one of claims 1 to 7, one surface of the composite is held on a transparent support surface, and the other surface is in an open space. and the auxiliary body is installed on the opposite side of the composite body of the light-transmitting support body. 9. In the transmission type display device according to claim 8, the surface of the porous body on the side facing the open space of the composite body has a dot shape, a short fence shape, including a large number of the openings, 1. A transmissive display device characterized in that a plurality of depressions having linear side slopes are installed, and the dedicated light is irradiated so as to intersect with the side slopes of the depressions. 10. The transmissive display device according to claim 9, wherein the surface of the porous body is selectively made opaque except for the plurality of depressions. 11. In the transmission type display device according to claim 1, the means for obliquely irradiating the dedicated light source is spaced apart from the surface of the composite body, and located near the end of at least one side of the composite body. A transmissive display device characterized in that it is configured by being installed in. 12. The transmission type display device according to claim 11, wherein a dedicated light source is installed near the ends of at least a pair of opposing sides of the composite body. 13. A transmissive display device according to claim 11 or 12, wherein the dedicated light source is a rod-shaped fluorescent lamp.