JPH03135523A - Photo-photo conversion element and applied device - Google Patents

Abstract

PURPOSE:To improve the utilization efficiency of light and to simplify the constitution of an optical system by providing a means which form a charge image corresponding to electromagnetic radiation including information to be displayed between a photoconductive layer member and an optical modulating material layer member. CONSTITUTION:A voltage is applied between two electrodes Et1 and Et2 of the photo-photo conversion element PPCe to apply an electric field to the optical modulating material layer member HLL which can operates in scatter mode. Further, when the electromagnetic radiation including the information to be picked up or displayed is supplied to the photoconductive layer part member PCL through the electrode Et1 of the photo-photo conversion element PPCe on the side of the photoconductive layer member PCL, the electric resistance value of the photoconductive layer member PCL varies corresponding to the electromagnetic radiation including the information to be picked up or displayed, the charge image corresponding to said electromagnetic radiation is formed on the border surface between the photoconductive layer member PCL and a member contacting it. Consequently, the constitution is simplified and light is used effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a light-to-light conversion element and an applied device such as a display device or an imaging device configured by applying the light-to-light conversion element.

(Prior Art) Display devices that use photographic film such as slide projectors, devices that project image signals on picture tubes, and other various configurations have been known for some time. Furthermore, as an imaging device, one constructed using an imaging tube or a solid-state imaging device is known.

(Problems to be Solved by the Invention) Since the conventional display devices described above were not able to display images with high resolution, there is a need for display devices that can display images with high resolution. There was a need for an imaging device with high resolution.

So you can display high resolution images.

Display devices that can display high-resolution optical images using light-to-light conversion elements and imaging devices that can generate high-resolution video signals using light-to-light conversion elements have been considered, but conventional optical - In the light conversion element, twisted nematic liquid crystals or various electro-optic crystals that utilize birefringence characteristics are used as the light modulating material layer member to be used in its construction, and the electric field strength applied to the light modulating material layer member is Since the light modulating material layer member performs an operation in which the state of the inclination of the polarization plane of the light changes according to It is necessary to extract the readout light whose polarization plane has changed in the tilt state by using the analyzer as light whose light intensity has changed. Its presence inevitably led to a reduction in efficiency and the occurrence of shading.

Furthermore, when a twisted nematic liquid crystal that utilizes birefringence properties or various electro-optic crystals are used as the light modulating material layer member as described above, the light modulating effect of the light modulating material layer member is caused by the optical axis of the crystal. If the readout light is incident from a direction other than the normal to the surface of the light modulation material layer member, the efficiency will drop significantly. Since the direction of incidence is the normal direction of the surface of the light modulating material layer member, in a single-reflection type light-to-light conversion element, the input readout light and the readout light emitted from the light-to-light conversion element can be separated. As shown, there is a half mirror 1 in the optical path.
Alternatively, an optical member such as a polarizing beam splitter may be provided, but as is well known, the use of such an optical member reduces the efficiency of light utilization and also prevents image information from being written by the writing light. In such a case, leakage of writing light may be read out.

Furthermore, when a light modulating material layer member consisting of a twisted nematic liquid crystal layer is used as the light modulating material layer member described above, a complicated process is required in which the twisted nematic liquid crystal must be injected into a cell made using a spacer. In addition to the drawback of the process required, large-scale light-
When producing a light conversion element, it is difficult to construct a light modulating material layer member using a twisted nematic liquid crystal layer with a uniform thickness. When a single crystal or other solid state element is used, there are problems such as a high half-wave voltage and difficulty in handling.

Furthermore, when the light-to-light conversion element is configured as a planar element, image information may be written on the entire surface of the light-to-light conversion element by means such as deflection of a laser beam. A complex deflection optical system such as an fθ lens is required.

(Means for Solving Problem 1) The present invention comprises at least a photoconductive layer member and a light modulating material layer member capable of operating in a scattering mode between two electrodes to which a predetermined voltage is applied. Electromagnetic radiation containing information to be imaged or displayed is applied to the photoconductive layer member through the electrode on the photoconductive layer member side of the light-to-light conversion element, thereby converting the photoconductive layer member and the light modulating material layer member. a means for generating a charge image corresponding to the electromagnetic radiation containing the information to be displayed; reading and displaying a change in the degree of scattering of light corresponding to an electromagnetic radiation image containing information to be displayed on the light modulating material layer member using a means for causing a change and electromagnetic radiation; A display device or an imaging device that photoelectrically converts read optical information and outputs it.

and a light-light conversion element used in the configuration of the above device.

(Function) A voltage is applied between the two electrodes of the light-to-light conversion element so that an electric field is applied to the light modulating material layer member that can operate in a scattering mode, and the photoconductive layer in the light-to-light conversion element is When electromagnetic radiation containing information to be imaged or displayed is applied to the photoconductive layer member through an electrode on the member side, the electrical resistance value of the photoconductive layer member is determined to be the object to be imaged or displayed. In order to correspond to the information-containing electromagnetic radiation, the interface between the photoconductive layer member and the member in contact therewith is exposed to the information-containing electromagnetic radiation imparted to the photoconductive layer member for imaging or display. A charge image corresponding to this is generated.

In the above state, the light modulating material layer member provided in series with the photoconductive layer member between the two electrodes to which the voltage of the power source is applied has the object to be imaged or displayed. An electric field with an intensity distribution corresponding to the charge distribution of the charge image corresponding to the electromagnetic radiation containing the information set in the image is applied.

In this state, the light modulating material layer member changes the degree of scattering of light in accordance with the electric field strength applied to it, so when readout light is projected onto the light modulating material layer member, it passes through the light modulating material layer member. The transmission state of the readout light changes.

As a result, light is emitted from the light modulating material layer member in a state where the amount of light changes in accordance with the charge image corresponding to the electromagnetic radiation that includes the information to be displayed, and an optical image display is performed. Make it. It also converts the optical image into an electrical signal and outputs a video signal.

Electromagnetic radiation for readout to be made incident on a light-to-light conversion element in a display device or an imaging device is made to enter the light-to-light conversion element in such a way that its main optical axis is different from the normal direction of the light-to-light conversion element. By doing so, it is possible to configure a device with improved light utilization efficiency, and it is also possible to configure a device with a curved light incident surface and a light exit surface as a light-to-light conversion element in a display device or an imaging device. The configuration of the optical system can be simplified by using the following.

(Example) Hereinafter, specific contents of the light-to-light conversion element and application device of the present invention will be explained in detail with reference to the accompanying drawings.

1 to 7 and 20 to 24 are side views of embodiments of the display device, and FIGS. 8 to 13, 15, and 19 are used to explain the light-to-light conversion element. 14, 16 to 18, and 25 to 27 are side views of embodiments of the imaging device.

In the display device shown in FIG. 1, 0 is the subject;
L is an imaging lens, P P Ce (P P Cm)
is a light-light conversion element, vb is a power source, LS is a light source, Lc is a collimator lens, Lp is a projection lens, S is a screen, and the display device shown in FIG. 1 displays an optical image of the object O. is converted into a high-resolution charge image in a light-to-light conversion element PPc (PPm), and the charge image is read out by a readout light and then displayed.

Here, first of all, the light-to-light conversion element PPCe shown in FIGS. Outline of the configuration and operation of the light-to-light conversion element PPC shown in FIGS. 10 to 13
m, that is, light of a configuration in which information storage operation is performed depending on the alignment state of liquid crystal in a polymer-liquid crystal memory film used as a light modulating material layer member.
The configuration and operation outline of the photoconversion element P P Cm will be explained.

First, in FIG. 8, P P Ca is a light-light conversion element,
vb has a power supply, and the light-light conversion element PPCe has a transparent electrode E.
tl, a photoconductive layer member PCL, a dielectric mirror DML, a light modulating material layer member HLL constructed using a polymer-liquid crystal composite film in which high-resistance liquid crystal is dispersed in a polymer material, and a transparent 1
! (The light-to-light conversion element PPC shown in FIG. 9 also has the same structural layer as the light-to-light conversion element shown in FIG. 8. belongs to).

The light-to-light conversion element shown in FIGS. 8 and 9 is constructed using a photoconductive layer member PCL and a polymer-liquid crystal composite film in which high-resistance liquid crystal is dispersed in a polymer material. A dielectric mirror DML is provided between the photoconductive layer member PCL and the light modulating material layer HLL. The dielectric mirror DML in the light-to-light conversion element and the dielectric mirror DML in FIGS. 14 to 18 may be omitted. This point is indicated using the drawing code PPCm in FIGS. 10 to 13. A dielectric mirror D in a light-to-light conversion element is shown using a drawing code of PPCep.
The same applies to ML).

Here, the polymer-liquid crystal composite film used as the light modulating material layer member HLL in the light-light conversion element PPCe will be described with reference to FIG.

The polymer-liquid crystal composite film used as the light modulating material layer member HLL described above is made of, for example, polyester resin, polycarbonate resin, vinyl chloride resin, polyamide resin, polyethylene resin, polypropylene resin, polystyrene resin, silicone resin, etc. Volume resistivity is 1014Ω
exhibiting a liquid crystal phase at room temperature in one or more polymeric materials;
Moreover, it is constructed by dispersing nematic liquid crystal having high volume resistivity.

Next, we will discuss a manufacturing example of a light-light conversion element constructed using the light modulating material layer member HLL made of the polymer-liquid crystal composite film described above. (1) Room temperature nematic liquid crystal E- Weighed 3 grams of E-44, and added 3 grams of room temperature nematic liquid crystal E-44 to 20 grams of P.
It is added to a 10% chloroform solution of MMA, stirred, and left to stand still.

A glass plate (not shown in FIGS. 8 and 9) on which a film of, for example, ITO is formed as a transparent electrode Et2 on one surface is thoroughly cleaned, and On the electrode Etz, a chloroform solution of PMMA containing the liquid crystal left as described above is applied using a bar coater to form a light modulating material layer member HLLti- of a polymer-liquid crystal composite film.

In addition to the above-mentioned PMMA, the above-mentioned polymer materials include:
Can be dissolved in a solvent and applied in the form of a film, and
Any polymer material with high volume resistivity may be used, but polycarbonate and PET, which have good transparency, can be used particularly well (this point will be explained later in (2) and (3)). The same applies to the production example).

Glass plate and transparent electrode Et2 made by the above process
and a light modulating material layer member HLL made of a polymer-liquid crystal composite film, and a structure made by a process different from the above-described process, that is, a glass plate (Figs. 8 and 9). If the transparent electrode Etl, the photoconductive layer member PCL, and the dielectric mirror DML are laminated together, a structure as shown in FIGS. 8 and 9 is simply bonded together. A light-light conversion element can be constructed.

(2) Room temperature nematic liquid crystal LI manufactured by Chisso Corporation
Weigh out 3 grams of X0N5017 (or LIXON 5028), add 3 grams of room temperature nematic liquid crystal LIXON 5017 (or LIXON 5028) to a 10% by weight solution of 20 grams of PMMA in chloroform, stir, and let stand.

A glass plate (not shown in FIGS. 8 and 9) on which an ITO film was formed as a transparent electrode Et2 on one surface was thoroughly cleaned, and the IT
A chloroform solution of PMMA containing liquid crystal, which had been left to stand still as described above, is coated with a bar coater on the transparent electrode EtZ made of an O film to constitute a light modulating material layer member HLL made of a polymer-liquid crystal composite film.

Glass plate and transparent electrode Et2 made by the above process
and a light modulating material layer member HLL made of a polymer-liquid crystal composite film are laminated, and a structure made by a process different from the above-described process.

If a glass plate (not shown in FIGS. 8 and 9) and a structure in which a transparent electrode Etl, a photoconductive layer member PCL, and a dielectric mirror DML are laminated are simply pasted together, A light-light conversion element having the configuration shown in FIGS. 8 and 9 is obtained.

(3) Room temperature nematic liquid crystal Z manufactured by Merck Japan
Weighed 3 grams of LI4277, and added 10% by weight of the above-mentioned 3 grams of room temperature nematic liquid crystal ZLI4277 to 20
It is added to a chloroform solution of gram of PMMA, stirred, and left to stand still.

A glass plate (not shown in FIGS. 8 and 9) on which an ITO film was formed as a transparent electrode Et2 on one surface was thoroughly cleaned, and the IT
A chloroform solution of PMMA containing liquid crystal, which has been left to stand still as described above, is coated on the transparent electrode EtZ made of an O film using a bar coater to constitute a light modulating material layer member HLL made of a polymer-liquid crystal composite film.

Glass plate and transparent electrode Et2 made by the above process
and a light modulating material layer member HLL made of a polymer-liquid crystal composite film, and a structure made by a process different from the above-described process, that is, a glass plate and a transparent electrode Et.
l and light guide 1! Layer members PCL and tal! If the body mirror DML and the structure in which the body mirror DML is laminated are simply bonded together, a light-to-light conversion element having a structure as shown in FIGS. 8 and 9 will be obtained.

The polymer-liquid crystal composite film in which liquid crystal is dispersed in the polymer material described above can be easily formed so that the film thickness variation is in the range of ±0°1 micron, and conventional photo-
It is easier to manufacture than a light conversion element.

The liquid crystal in the light modulating material layer member HLL using the polymer-liquid crystal composite film produced as described above is confined in the countless pores existing in the polymer material. The above-mentioned pores in the polymer-liquid crystal composite film used as the light modulating material layer member HLL are suitable for light-to-light conversion as shown in the examples described below with reference to FIGS. 10 to 13. In the device PPCm, the polymer-liquid crystal composite film used as the light modulating material layer member HLM is larger in size than the countless pores that confine the liquid crystal in the polymer material.

Also, among the production examples (1) to (3) above, the nematic liquid crystals used in production examples (2) and (3) are as follows.

Since the specific resistance of the liquid crystal is as high as 10"Ω, a polymer material with a volume resistivity of 10L4ΩG or more is used as the polymer material for dispersing the liquid crystal. Light modulating material layer member H using liquid crystal composite film
A light-to-light conversion element equipped with LL can write and read high-resolution image information, and the electric field applied to the polymer-liquid crystal composite film used as the light modulating material layer member HLL is a DC voltage. By using a high-resistance liquid crystal (liquid crystal with an extremely small amount of ions mixed in) even in the field, it is possible to prevent image resolution from deteriorating even over a long period of time. .

That is, when a liquid crystal containing a large number of ions and having a low volume resistivity is used in a light modulating material layer member using a polymer-liquid crystal composite film.

Ions contained in the liquid crystal move due to the electric field applied to the light modulating material layer member, and in order to reduce the intensity of the electric field due to the charge image that is applying the electric field to the light modulating material layer member, the optical The inclination of the optical axis of the liquid crystal molecules decreases, and as a result of the decrease in the inclination of the optical axes of the liquid crystal molecules described above, the electric field caused by the charge image is disturbed and the resolution of the charge image is degraded.

The nematic liquid crystal used in (3) has a high specific resistance of I x 1013Ω, and the polymer material used to disperse the liquid crystal has a volume resistivity of 1014Ω1. Light modulating material layer member HL made of a polymer-liquid crystal composite film made using the above
In the light-to-light conversion element with L, since the liquid crystal does not contain many ions, the above-mentioned disadvantageous operation by the ions does not occur. A writing/reading operation of resolution image information is performed.

Now, in the light-to-light conversion element PPCe shown in FIG. 8, a voltage is applied from the power supply VB between its two transparent electrodes Etl and Etz, and it is configured as a light modulating material layer member that can operate in a scattering mode. An electric field is applied between the light modulating material layer members HLL by a polymer-liquid/crystal composite film in which high-resistance liquid crystals are dispersed in a polymer material, and the photoconductivity in the light-to-light conversion element PPCe is When writing light WL is applied to the photoconductive layer member PCL on the layer member PCL side, the electrical resistance value of the photoconductive layer member PCL changes in accordance with the incident light that reaches it. A charge image corresponding to the light focused on the photoconductive layer member is generated at the interface with the dielectric mirror DML.

In the above state, between the two transparent electrodes Etl and EtZ to which the voltage of the power supply vb is applied, a high resistance liquid crystal is formed on the polymer material provided in series with the photoconductive layer member PCL. An electric field with an intensity distribution corresponding to the charge distribution of the charge image corresponding to the writing light is applied to the light modulating material layer member HLL made of the polymer-liquid crystal composite film in which the writing light is dispersed.

In this state, in the polymer-liquid crystal composite film used as the light modulating material layer member HLL, the alignment state of the liquid crystal changes due to the electric field caused by the charge image, and an image of change in the alignment state of the liquid crystal corresponding to the writing light is created. arise.

As described above, the photoconductive layer member PCL and the dielectric mirror D
Based on the electric field due to the charge image generated at the interface with ML,
The image of the change in the alignment state of the liquid crystal that occurs in response to the writing light in the polymer-liquid crystal composite film used as the light modulating layer member HLL is shown at the interface between the photoconductive layer member PCL and the dielectric mirror DML. As long as the generated charge image exists, it remains in that state.

That is, the light modulating material layer member HL is
The electric field applied to the polymer-liquid crystal composite film used as L is a DC electric field, but the liquid crystal with high resistance (
By using a liquid crystal (liquid crystal with an extremely small amount of ions mixed in), it is possible to prevent the image resolution from deteriorating even over a long period of time as described above.

Note that it goes without saying that recording and reproducing operations can be performed even when an AC power source is used as the power source connected between the two transparent ffi poles Etl and Et2 in the light-to-light conversion element PPCe shown in FIG. Wi pole Etl, Et
When recording is performed with an AC power supply connected between the
Since the recording of the charge image as described above is not performed, it is necessary to perform the reproducing operation simultaneously with the recording operation.

Next, the charge a (dielectric mirror DM) generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML as described above
If L is not used, then ! Both images are photoconductive layer member PC
It goes without saying that this occurs at the interface between L and the light modulating material layer member HL (which occurs at the interface between the polymer and liquid crystal composite film used as the light modulating material layer member HL L), then the polymer used as the light modulating material layer member HLL is removed. (1) Since the electric field applied to the liquid crystal composite film disappears, the liquid crystal in the polymer-liquid crystal composite film becomes an isotropic phase, and even if the readout light RL is made incident on the light modulating material layer member HLL, image information is not reproduced; In other words, erasure will be performed.

Therefore, as for the erasing operation, as described above, the photoconductive layer member P
The charge image generated at the interface between CL and dielectric mirror DML (
Needless to say, when the monoelectric mirror DML is not used, a charge image is generated at the interface between the photoconductive layer member PCL and the polymer-liquid crystal composite film used as the light modulating material layer member HLL. ) may be deleted, for example, as illustrated in FIG. 9, '/
11. The erasing light EL from the light source ELS is sent to the lens Ls.
The light may be made to enter the light-to-light conversion element PPCε from the transparent electrode Etl side of the light-to-light conversion element PPCa to reduce the electrical resistance value of the photoconductive layer member PCL. During the erasing operation, the two transparent electrodes Etl and Et2 of the light-to-light conversion element P P Ca may be short-circuited as described above, or both may be grounded.

As already described with reference to FIG. 8, the charge image corresponding to the writing light is transmitted to the interface between the photoconductive layer member PCL and the dielectric mirror DML in the light-to-light conversion element PPCe (the dielectric mirror DML is not used). In some cases, an electric field is generated at the interface between the photoconductive layer member PCL and the polymer-liquid crystal composite film used as the light modulating material layer member HLL, and an electric field due to the charge image is applied to the light modulating material layer member HLL. In the state of being.

When readout light RL is incident from a light source (not shown) from the transparent electrode Et2 side of the light-light conversion element P P Ca, the readout light RL is transmitted from the transparent electrode Et2 to the polymer used as the light modulating material layer member HLL. One liquid crystal composite film→dielectric mirror DML reaches the dielectric mirror DML, and after being reflected there, the polymer one liquid crystal composite film used as the light modulating material layer member HLL→transparent electrode Et2. The light is emitted from the light conversion element PPCa.

The readout light RL emitted from the light-to-light conversion element PPCe as described above is transmitted to the interface between the photoconductive layer member PCL and the dielectric mirror DML (if the dielectric mirror DML is not used, the photoconductive layer member PCL and light modulating material layer member HLL
interface with a polymer-liquid crystal composite film used as
The intensity of the light changes in response to the electric field caused by the charge image generated in the image.

That is, by applying an electric field with an intensity distribution according to the charge distribution of the charge image corresponding to the optical image of the subject to the liquid crystal in the polymer-liquid crystal composite film used as the light modulating material layer member HLL, the liquid crystal changes its orientation state in response to the electric field intensity applied to it, and the light modulating material layer member H
Since different scattering operations are performed on the readout light RL that passes back and forth through the polymer-liquid crystal composite film used as the L L as described above, when the readout light is projected onto the light modulating material layer member HLL, the light modulation occurs. The light intensity of the readout light RL emitted after passing through the material layer member HLL changes in accordance with the optical image of the subject.

In this way, since the reading light RL emitted from the light-to-light conversion element PPCe is in a state where the light intensity is changing in correspondence with the writing light, the change in light intensity is detected by the analyzer. Compared to the case where the light is converted into light and then used, the structure can be simplified and the light can be used more efficiently.

As the light source of the readout light RL, light from any light source such as a laser light source, an incandescent lamp, or a discharge lamp can be used. Further, it goes without saying that the readout light RL can be used either as a light beam with a minute diameter or as a light beam with a large area.

The light modulating material layer member that can operate in the scattering mode in the light-to-light conversion element described so far is a light modulating material constructed using a polymer-liquid crystal composite film in which high-resistance liquid crystal is dispersed in a polymer material. An embodiment using a layer member and a light modulating material layer member constructed using a polymer material in which liquid crystals are dispersed in a polymer material and a liquid crystal memory film has been described. PLZT (e.g. P
A light-to-light conversion element configured with LZT8/70/30) as a light modulating material layer member may be used.

In addition, PLZT whose light scattering state changes repeatedly depending on the electric field.
In the case of a light-to-light conversion element in which (for example, PLZT8/70/30) is used as a light modulating material layer member, erasing is performed not by heating but by making erasing light enter the light-to-light conversion element. .

Next, the light-light conversion element shown in FIGS. 10 to 13 will be explained. In each figure, PPCm is a light-to-light conversion element, vb is a power supply, WL is a writing light, and RL is a readout light. Also, in Fig. 10, HEC is a heating power supply, in Fig. 11, Le is a lens, and ELS is an eraser. In FIG. 13, the light source for ELS I! is a laser light source for erasing, DEF is a light deflector, and M is a reflecting mirror.

The light-light conversion element PPCm shown in FIG. 10 includes a transparent electrode Etl and a photoconductive layer member PCL.

A dielectric mirror DML, a light modulating material layer member HLM constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material, a transparent electrode Et2, a heating layer HEL (this heating layer HEL and a transparent electrode Et2 may also be used in combination with Et2), and the light beam shown in FIGS.
The light conversion element PPCm includes a transparent electrode Etl, a photoconductive layer member PCL, a dielectric mirror DML, and a light modulating material layer member constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material. ) ILM, a heat absorption layer HIL, and a transparent electrode Et2 are laminated,
Furthermore, the light-to-light conversion element P shown in FIG.
PCm is a transparent electrode Etl, a photoconductive layer member PCL, a dielectric mirror DML, a heat absorption layer HIL, and a light modulating material layer constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material. The structure is such that the member HLM and the transparent electrode Et2 are laminated.

In addition, in the light-to-light conversion element PPCm shown in FIGS. 10, 11, and 13, the photoconductive layer member P
Although a dielectric mirror DML is provided between CL and a light modulating material layer member HLM constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material, the photoconductive layer member P
CL reflects the readout light RL, and the readout light RL
The dielectric mirror DML may be omitted as long as it has no sensitivity to the photoconductive layer member PCL and the heat absorption layer) in the light-to-light conversion element PPCm shown in FIG. (A dielectric mirror DML is provided between the IL and one of the heat absorption layer HIL and the photoconductive layer member PCL that reflects the readout light RL and has no sensitivity to the readout light RL.) In that case, the dielectric mirror DML may be omitted.

The heating layer HEL in the light-to-light conversion element PCCm shown in FIG. It is for melting the liquid crystal in the light modulating material layer member HLM constructed using a liquid crystal memory film, and the heat absorption layer HIL shown in FIGS. 11 to 12@ is for erasing. A light modulating material layer member HL that generates heat by erasing light during operation and is constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material.
This is for melting the liquid crystal in M.

The light modulating material layer member HLM in the light-to-light conversion element PPCm shown in FIGS. 10 to 12 described above is constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material. has been done.

The polymer-liquid crystal memory film used as the light modulating material layer member HLM in the light-to-light converting element PPCm described above is the light modulating material layer member in the light-to-light converting element PPCe described with reference to FIG. Similar to the polymer-liquid crystal composite film used as HLL, volume resistors such as methacrylic resin, polyester resin, polycarbonate resin, vinyl chloride resin, polyamide resin, polyethylene resin, polypropylene resin, polystyrene resin, silicone resin, etc. It can be constructed by dispersing a nematic liquid crystal that exhibits a liquid crystal phase at room temperature and has a high volume resistivity in a polymeric material having a resistivity of 1014 Ω1 or more.

As the liquid crystal used to construct the above-mentioned polymer-liquid crystal memory HLM, any liquid crystal that forms a nematic phase at room temperature may be used. The use of materials with high viscosity and high viscosity produces good results in reproducing information with a high contrast ratio and improving recording performance. In addition, the liquid crystal used to construct the polymer-liquid crystal memory film HLM described above must have a melting point lower than that of the polymer material.

By the way, the polymer-liquid crystal memory film used as the light modulating material layer member HLM in the above-mentioned light-light conversion element PPCm uses the polymer-liquid crystal composite film already described with reference to FIG. A light modulating material layer member HLL configured as
However, unlike the case where the alignment state of the liquid crystal was maintained by the electric field applied thereto, the light modulating material layer member HL
A memory function in which an electric field is applied to M to change the orientation state of the liquid crystal in the polymer-liquid crystal memory film, and then the orientation state of the liquid crystal in the polymer-liquid crystal memory film does not change even if the electric field is removed. It is made as if it were equipped with the following.

The liquid crystal used as one of the constituent elements of the polymer-liquid crystal memory film HLM described above is the polymer-liquid crystal memory film HLM.
It is encapsulated in countless minute pores that are randomly distributed in the porous polymer material membrane used as other components of LM. The memory function of the liquid crystal in the polymer-liquid crystal memory film described above is achieved by reducing the size of the pores in the polymer material in which the liquid crystal is confined, and by reducing the size of the pore walls added to the liquid crystal in the polymer material. It is believed that this can be achieved by increasing the force of , and it is a desirable embodiment that the pores have a diameter of, for example, about 0.5 microns or less.

As mentioned above, an electric field is applied to the liquid crystal sealed in the countless minute pores randomly distributed in the porous polymer material film of the polymer-liquid crystal memory film. The following is a supplementary explanation of the memory function in which the alignment state that occurs in the liquid crystal so that the liquid crystal memory film tends to become transparent continues to be maintained even after the above-mentioned applied electric field is removed.

The liquid crystal molecules encapsulated in the pores are encapsulated in a nematic phase state in the minute pores under the force of the pore wall surface. The liquid crystal molecules in the pores are subjected to surface forces of the pore walls, and the closer the pore walls are to the liquid crystal molecules, the greater the force applied to them. (The effect of the force on the surface of the pore wall that is applied to the liquid crystal molecules in the liquid crystal molecules increases)
However, if an electric field with an electric field strength of more than a certain threshold is applied to the liquid crystal sealed in the pore under the force of the surface of the pore wall as described above, the pore will The liquid crystal molecules enclosed in the pore in a nematic phase while being subjected to the force from the surface of the wall resist the force applied from the surface of the pore wall and move in the direction of the electric field. Displace to orient.

The mode of displacement that occurs in liquid crystal molecules in response to the application of an electric field changes depending on the strength of the applied electric field, and when the electric field applied to the liquid crystal is weak, Only liquid crystal molecules with a weak force, that is, liquid crystal molecules mainly located near the center of the pores, are displaced with a tendency to face the direction of the applied electric field, and the strength of the electric field applied to the liquid crystal gradually becomes stronger. As the force is applied from the surface of the pore wall, liquid crystal molecules located close to the pore wall also tend to have their molecular axes directed in the direction of the applied electric field. The liquid crystal molecules are oriented in a manner of displacement such that the liquid crystal molecules are displaced at .

Therefore, the liquid crystal molecules encapsulated in a nematic phase in the countless minute pores that are randomly distributed and formed in the porous polymer material film of the polymer-liquid crystal memory film are When applied, the molecular axes of the liquid crystal are oriented in the direction of the electric field against the force applied from the surface of the pore wall. The liquid crystal molecules oriented by the applied electric field are
Since the alignment state of the liquid crystal changed by the application of an electric field as described above remains in that state even after the applied electric field is removed, the memory function is maintained. It shows.

In order to erase the storage state of information due to the orientation state of the liquid crystal, it is necessary to adjust the melting point of the polymer used as the light modulating material layer member HLM and the liquid crystal in the liquid crystal memory film to the polymer material. It is necessary to perform this by heating the liquid crystal to a temperature between the melting point and melting the liquid crystal into an isotropic phase. The liquid crystal cools over time and becomes a nematic phase, and that part changes to an opaque state.

First, the light-light conversion element PPCm shown in FIG.
A polymer-liquid crystal memory in which liquid crystal is dispersed in a polymer material configured as a light modulating material layer member that can operate in a scattering mode by applying a voltage from a power source Vb between the two transparent electrodes Eta and EtZ. An electric field is applied between the light modulating material layer members HLM by the film, and the light-light conversion element PP
When an optical image of the subject is formed as writing light WL on the photoconductive layer member PCL from the photoconductive layer member PCL side at Cm through an imaging lens (not shown), the electric resistance value of the photoconductive layer member PCL described above is In order to change correspondingly with the optical image due to the incident light reaching it.

A charge image corresponding to the optical image of the subject formed on the photoconductive layer member is generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML.

In the above state, liquid crystal is dispersed in the polymeric material provided in series with the photoconductive layer member PCL between the two transparent electrodes Etl and EtZ to which the voltage of the power supply Vb is applied. An electric field with an intensity distribution corresponding to the charge distribution of the charge image corresponding to the optical image of the object is applied to the light modulating material layer member HLM made of the polymer-liquid crystal memory film.

In this state, in the polymer-liquid crystal memory film used as the light modulating material layer member HLM, the alignment state of the liquid crystal changes due to the electric field caused by the charge image, and the alignment state of the liquid crystal corresponds to the electromagnetic radiation image of the subject. A changed image is generated and its state of orientation is memorized.

As described above, the photoconductive layer member PCL and the dielectric mirror D
Changes in the alignment state of the liquid crystal that occur in the polymer-liquid crystal memory film used as the five-light modulating material layer member HLM based on the electric field due to the charge image generated at the interface with the ML in response to the electromagnetic radiation image of the subject. The image remains as it is even if the charge image generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML is removed.

When readout light RL is incident from a light source (not shown) from the heating MHEL side in the light-to-light conversion element P P Cm shown in FIG. 10, the readout light RL is transmitted through the heating layer HEL→
It reaches the dielectric mirror DML through the path of transparent electrode Et2 → polymer used as the light modulating material layer member HLM → dielectric mirror DML, and after being reflected there, it is used as the light modulating material layer member HLM. The light is emitted from the light-to-light conversion element ppCm along the path of polymer-liquid crystal memory film -> transparent electrode Et2.

The readout light RL emitted from the light-light conversion element PPCm as described above corresponds to an image of a change in the alignment state of the liquid crystal occurring in the polymer-liquid crystal memory film used as the light modulating material layer member HLM. The intensity of the light is changing.

In this way, the readout light RL emitted from the light-to-light conversion element PPCm has a light intensity varying in correspondence with the writing light, so that the readout light from the conventional light-to-light conversion element is different from the light intensity. Compared to the case where it is used after converting it into light with varying intensity using an analyzer,
The advantage is that the configuration can be simplified and light can be used efficiently.

Note that as the light source of the readout light RL, light from any light source such as a laser light source, an incandescent lamp, or a discharge lamp can be used. Further, it goes without saying that the readout light RL can be used either as a light beam with a minute diameter or as a light beam with a large area.

Next, in order to erase the information stored by the alignment state of the liquid crystal in the polymer-liquid crystal memory film used as the light modulating material layer member HLM as described above, the light modulating material layer member HLM is The temperature of the liquid crystal in the polymer-liquid crystal memory film used as a liquid crystal memory film is raised to a temperature between the melting point of the polymer material and the melting point of the polymer material to melt the liquid crystal and make it into an isotropic phase. However, in the display device of the embodiment shown in FIG. 10, it is necessary to perform heating l! during the erasing operation. The heating power from the source HE C is supplied to the heating layer HEL of the light-to-light conversion element PPCm (this heating layer HEL and the transparent electrode Et2 may be used in combination) to cause the heating layer HEL to generate heat. and light modulating material layer member HLM
By heating the polymer-LCD memory film used as a liquid crystal memory film, the liquid crystal in the polymer-LCD memory film is heated to a temperature between its melting point and the melting point of the polymer material. This can be done by melting to form an isotropic phase.

Note that a charge image (dielectric mirror I) generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML during the writing operation
If ML is not used, the charge image is transferred to the photoconductive layer member P.
It goes without saying that this occurs at the interface between the CL and the polymer-liquid crystal memory film used as the light modulating material layer member HLM. Before carrying out the memory erasing operation in , it is necessary to also erase the above-mentioned charge image.

In order to erase the charge image, for example, as already described with reference to FIG.
Cm to reduce the electrical resistance value of the photoconductive layer member PCL.

Note that two transparent electrodes Etl are used during the above erasing operation.

EtZ may be short-circuited, open, or grounded.

Next, the light-light conversion element PPC shown in FIGS. 11 to 13
The configuration of m is different from the light-to-light conversion element P P Crrt shown in FIG. 10 described above, but it is different from the light-to-light conversion element PPCm shown in FIGS. The write operation and read operation are the same as the write operation and read operation in the optical-to-optical conversion element PPCm shown in FIG. 10 described above, and differ only in the erase operation.

That is, the light-light conversion element P shown in FIGS. 11 to 13
In PCm, the polymer used as the light modulating material layer member HLM is used as the light modulating material layer member HLM during the erasing operation to erase information stored by the alignment state of the liquid crystal in the liquid crystal memory film. A heating action is used to raise the temperature of the liquid crystal in the polymer material in the liquid crystal memory film to a temperature between the melting point of the liquid crystal and the melting point of the polymer material.

This is different from the light-to-light conversion element PPCm shown in FIG. 10 described above in that a configuration is adopted in which the heating is performed by increasing the temperature of the heat absorption layer HIL caused by irradiation with erasing light.

In the erasing operation of the light-to-light conversion element P P Cm shown in FIG.
The erasing operation of the light-to-light conversion element PPCm shown in FIG. Erasing light EL from a light source is irradiated through the transparent electrode Etl and the photoconductive layer member PCL, and the erasing operation of the light-to-light conversion element PPCm shown in FIG. Conversion element PPC
An erasing laser light source EL is provided on the heat absorption layer HI L at m.
Erasing light from the SQ is deflected in a predetermined manner by a light deflector fDEF, and the erasing light is irradiated via a reflecting mirror M.

Note that the light-light conversion element PPC shown in FIGS. 11 to 13
The heat absorbing layer HIL to be provided in the light-light absorbing layer HIL should be able to effectively raise the temperature of the liquid crystal in the polymer-liquid crystal memory film used as the modulating material layer member HLM by the erasing heat generated therein. Of course, it may be provided in any part of the conversion element PPCm, and the heat absorption layer H
The structure may be such that the IL and the electrode are used together.

Now, in the display device of the present invention including the light-to-light conversion element PPCe (or the light conversion element PPCm) provided with the light modulating material layer member capable of operating in the scattering mode as described above, first, FIG. In the display device of the embodiment shown in FIG. As described above with reference to FIGS. 8 to 13, the corresponding charge image is formed on the light-light conversion element P.
Photoconductive layer member PCL in PCe (or PPCm)
An electric field generated at the interface between the surface opposite to the transparent electrode Etl side and another member is applied to the light modulating material layer member HLL (or HLM), whereby the light modulating material layer is The alignment state of the liquid crystal in the polymer-liquid crystal composite film (or polymer-liquid crystal memory film) used as the member HLL (or HLM) changes in response to the electric field strength applied to it, and its The orientation state is maintained.

Therefore, the readout light from the light source LS is transferred to the light-light conversion element PPCe (or PPCm) through the collimator lens Lc.
When the readout light is made incident on the transparent electrode Et2 side in the transparent electrode Et2 → light modulating material layer member HLL (or H
The polymer-liquid crystal composite film (or polymer-liquid crystal memory I) used as the light modulating material layer member HLL (or The polymer-liquid crystal composite film (or polymer-liquid crystal memory film) used as HLM) → the light-light conversion element PPCe (
or PPCm).

(Note that the explanation regarding the optical path of the readout light in the light-to-light conversion element described above is based on a light-to-light conversion element having a configuration in which the heating layer HEL or the heat absorption layer HIL is not provided in the optical path of the readout light in the light-to-light conversion element. Regarding conversion elements, light-
In the light-to-light conversion element, the heating layer HEL and the heat absorption layer HIL are provided in the optical path of the readout light in the light conversion element.
It goes without saying that L is included).

As described above, the light-to-light conversion element PPCe (or PP
The readout light emitted from Cm) is in a state where the intensity of the light changes in response to the electric field due to the charge image generated at the interface between the photoconductive layer member PCL and other members described above. It has become.

That is, the liquid crystal in the polymer-liquid crystal composite film (or polymer-liquid crystal memory film) used as the light modulating material layer member HLL (or HLM) is charged according to the charge distribution of the charge image corresponding to the optical image of the subject. When an electric field with an intensity distribution is applied, the liquid crystal changes its alignment state in accordance with the applied electric field intensity, and the light modulating material layer member HLL changes.
The light modulating material layer performs different scattering operations for the readout light RL that passes back and forth as described above through the polymer-liquid crystal composite WA (or polymer-liquid crystal memory film) used as the HLM (or HLM). Member HLL (or HLM)
When the readout light is projected onto the light modulating material layer member HLL (or HLM), the light intensity of the readout light emitted after passing through the light modulating material layer member HLL (or HLM) changes in accordance with the optical image of the subject.

In this way, the light-light conversion element ppca (or PPCm)
Since the reading light emitted from the writing light is in a state where the light intensity is changing in correspondence with the writing light, it is used after converting it into light with changing light intensity using an analyzer. Compared to the case.

This has the advantage that the configuration can be simplified and light can be used efficiently, and the readout light emitted from the light conversion element PPCe (or PPCm) is transmitted to the screen S via the projection lens LP. The optical image of the subject 0 can be displayed on the screen S.

The optical image on the screen S described above is created by the light source L of the readout light.
High brightness can be achieved by increasing the optical output of S.

As the light source for the readout light, light from any light source such as a laser light source, an incandescent lamp, or a discharge lamp can be used.

In the display device shown in FIG. 1 described above, the illustration of the erasing means is omitted (the same applies to FIGS. 2 to 7), but for the erasing operation, see FIGS. 9 to 13. This can be done by applying the erasing means as described above.

Next, the display devices of the embodiments shown in FIGS. 2 to 7 will be explained. In the display device of each embodiment shown in FIGS. 2 to 7, the light-light conversion element PPCa (
The writing operation for the PPCm) is performed using a laser beam whose intensity is modulated depending on the information to be displayed. The light that should be
14 to 1 instead of the light-to-light conversion element PPCe (PPCm) shown in the figure as being used in the display device of each of the embodiments shown in FIGS. 2 to 7.
A light-to-light conversion element PPCep, which is indicated by the drawing symbol PPCep in Figure 8, is used as a light modulating material layer member, that is, a PLZT porcelain whose light scattering state changes repeatedly depending on the applied electric field. (Of course, it may also be something else.)

In each figure from FIG. 2 to FIG. 7, LSQ is a laser light source that emits a laser beam whose intensity is modulated according to the information to be displayed, LL, L2 are lenses, and DEF.
1 is a light deflector, and the laser light emitted from the laser light source LSjl that emits a laser light whose intensity is modulated according to the information targeted for display is deflected in a predetermined polarization manner by the light deflector DEF. Light as a writing light
The signal is given to the light conversion element PPc (PPm) and written to the light-to-light conversion element PPCe (PPCm).

In the display device shown in the second diagram, vb is l! source, LS is the light source (reading light g>, Lc is the collimator lens, Lp
is a projection lens, S is a screen, and in the display device shown in the second figure, a laser beam whose intensity is modulated according to the information to be displayed is passed through a light-to-light conversion element ppca (
or PPCm), the writing light is imaged on the photoconductive layer member in the light-to-light conversion element PPCa (or PPCm), and the corresponding charge image is formed as shown in FIGS. 8 to 13. As described above, a charge image is generated at the interface between the surface of the photoconductive layer member PCL of the light-light conversion element PPCe (or PPCm) on the opposite side to the transparent electrode Etl side and other members. By applying an electric field to the light modulating material layer member HLL (or HLM), the polymer-liquid crystal composite film (or polymer-liquid crystal memory film) used as the light modulating material layer member HLL (or HLM) The alignment state of the liquid crystal inside changes in response to the electric field intensity applied thereto, and the alignment state is maintained. PPCe (or PP
When the readout light is made incident on the transparent electrode Et2 side in Cm ), the readout light is transmitted to the polymer-liquid crystal composite film (or Polymer-LCD memory film)→
A light-light conversion element PP is sent back and forth through the dielectric mirror DML.
Emitted from Ce (or PPCm).

The readout light emitted from the light-to-light conversion element PPCa (or PPCm) as described above is combined with an electric field due to a charge image generated at the interface between the photoconductive layer member PCL and other members as described above. Since the light intensity is changing correspondingly, the readout light emitted from the light conversion element PPCθ (or PPCm) is imaged on the screen S via the projection lens Lp, and The optical image of the subject O can be displayed.

Next, the display devices shown in FIGS. 3, 4, and 6 have a configuration in which the light-to-light conversion element PPCa (or PPCm) used therein can transmit readout light. The reading light is transmitted from the same side as the writing light incident side to the light-to-light conversion element PPCe (
or PPCm), and the above-described figures 3 and 4 and 6
The light-to-light conversion element P P Ce (or PPCm) used in the display devices shown in the figures.
For example, a photoconductive layer member that does not include a dielectric mirror that reflects readout light and is not sensitive to readout light is used.

First, in the display device shown in the third figure, vb is the power supply, LS
is a light source (reading light 113K), Lc is a collimator lens, LP is a projection lens, S is a screen, and the laser beam whose intensity is modulated according to the information to be displayed is transmitted to the light-to-light conversion element PPCe. (or ppcm)
When given for.

The writing light is transmitted to the light-to-light conversion element PPCe (or PPC
imaged onto the photoconductive layer member in m).

A corresponding charge image is generated at the interface between the surface of the photoconductive layer member PCL on the opposite side to the transparent electrode Etl side and other members in the light-to-light conversion element PPCe (or PPCm), and an electric field due to the charge image is generated. is the light modulating material layer member HLL (
or HLM), the alignment state of the liquid crystal in the polymer-liquid crystal composite film (or polymer-liquid crystal memory l1l) used as the light modulating material layer member HLL (or HLM) is changed accordingly. The orientation state is maintained by changing in response to the applied electric field strength.

When the readout light from the optical ILS is made incident on the transparent electrode Etl side of the light-to-light conversion element PPCe (or PPCm) via the collimator lens Lc, the readout light is transmitted to the photoconductive layer member and the light modulating material layer member) fLL (or Light is transmitted from the transparent electrode Et2 side through the polymer-liquid crystal composite film (or polymer-liquid crystal memory film) used as HLM).
A light conversion element PPCe (or PPCm) is emitted.

As described above, the light-to-light conversion element PPCe (or PP
The readout light emitted from Cm) is in a state where the intensity of the light changes in response to the electric field due to the charge image generated at the interface between the photoconductive layer member PCL and other members as described above. Therefore, the photoconversion element PPCe (or PPCm
) is imaged on the screen S via the projection lens Lp, and an optical image corresponding to the written information can be displayed on the screen S.

In the display device shown in FIG. 4, after writing is performed on the light-to-light converter ppca (or PPCm), as in the case of the display device explained with reference to FIGS. 2 and 3,
A polymer used as the photoconductive layer member and the light modulating layer member HLL (or HLM) of the light-to-light conversion element PPCa (or PPCm) by irradiating it with a backlight Lb from the writing light incident side. This is a display device in which light is transmitted through a liquid crystal composite l1l (or a polymer and liquid crystal memory film) and emitted from the transparent electrode Et2 side, and the emitted light is viewed directly.

As described above, the light-to-light conversion element ppce (or PP
The intensity of the readout light from the backlight Lb emitted from the photoconductive layer member PCL changes in accordance with the electric field caused by the charge image generated at the interface between the photoconductive layer member PCL and other members described above. Therefore, the purpose of display can be achieved by directly viewing the readout light emitted from the light conversion element PPCe (or PPCm).

Further, since the display device shown in FIG. 5 is configured with a reflective light-to-light conversion element PPCe (or PPCm) as in the case of the display device described above with reference to FIG. After performing a write operation on the photoconversion element PPCe (or PPCm) in the same manner as described with reference to FIGS. Photoconversion element PPC
The polymer-liquid crystal composite film used as the light modulating material layer member HLL (or HLM) of e (or PPCm)
Or go back and forth between polymer and liquid crystal memory film) and transparent 1! Ti
This is a display device in which light is emitted from the Et2 side and the emitted light is viewed directly.

As described above, the light-to-light conversion element PPCe (or PP
The readout light emitted from Cm) is in a state where the intensity of the light changes in response to the electric field due to the charge image generated at the interface between the photoconductive layer member PCL and other members as described above. Therefore, the photoconversion element PPCe (or PPCm
) The purpose of display is achieved by directly viewing the readout light emitted from the display.

Next, FIGS. 6 and 7 show a display device using a schlieren optical system as an optical system for reading information written to a light-to-light conversion element ppCe (or PPCm). In the figure and FIG. 7, 1 is a schlieren input mask, 2 is a lens, and 3 is a schlieren output mask.

The display device shown in FIG. 6 has a configuration in which the light-to-light conversion element ppcs (or PPCm) used therein can transmit readout light, and the light-to-light conversion element PPCe ( This is a display device that uses a Schlieren optical system as an optical system for reading out information written to a PPCm), and in the display device shown in Fig. 6, the intensity is modulated depending on the information to be displayed. The laser light emitted from the laser light source LSQ that emits the laser light is deflected in a predetermined manner by the optical deflector DEF, and then reflected by the dichroic mirror 4 and sent to the light-to-light conversion element PPc (PPm) as a writing light. )
and written into the light-to-light conversion element PPCs (PPCm).

In the display device shown in FIG. 6 (and FIG. 7 described later), vb
is a power supply, SW is a switch, and when the light-to-light conversion element PPCe (or PPCm) of the display device is performing a writing operation, the movable contact of the switch SW is mmv.
b side to supply voltage to the transparent electrodes Etl and Et2 of the light-to-light conversion element PPCe (or PPCm), and in operating states other than write operation, the movable contact of the switch SW described above supplies light. - Transparent electrode Etl, E of the photoconversion element ppca (or PPCm)
A short final state is maintained during tZ.

The display device shown in FIG. 6 includes a transmission type light-light conversion element PP.
After a writing operation is performed on Ca (or PPCm) by the writing light in the same manner as described for the display device shown in FIGS. The light-to-light conversion element P P Ce (or P
PCm) is incident from the transparent electrode Etl side.

Transmissive light-light conversion element P P Ca (or PPC
The above-described readout light incident from the transparent electrode Etl side of m) is transmitted to the polymer-liquid crystal used as the photoconductive layer member and the light modulating material layer member HLL (or HLM) of the light-to-light conversion element PPCe (or PPCm). The light passes through the composite film (or polymer-liquid crystal memory III) and exits from the transparent electrode Et2 side, is projected onto the screen S via the output mask 3 of the Schlieren optical system and the projection lens Lp, and is displayed on the screen S. Display the targeted information.

The display device shown in FIG. 7 includes a reflective light-light conversion element PP.
After a writing operation is performed with the writing light on Ce (or ppcm) in the same way as described for the display device shown in FIGS. The light-to-light conversion element PPCe (or PPCm
) is incident from the transparent electrode Et2 side.

The above-described readout light incident from the transparent electrode Et2 side of the reflective light-to-light conversion element PPCe (or PPCm) is light-
From the transparent electrode Et2 side by going back and forth through the polymer-liquid crystal composite film (or polymer-liquid crystal memory film) used as the light modulating material layer member HLL (or HLM) of the light conversion element P P Ce (or PPCm) The light is emitted and projected onto the screen S via the output mask 3 of the Schlieren optical system and the projection lens LP, and the information targeted for display is projected onto the screen S.

As is clear from the above description, the light-to-light conversion element PPCe (or PPCm) used in one display device
) causes the readout light incident thereon to be scattered in a different state depending on the electric field caused by the charge image generated at the interface between the photoconductive layer member PCL and other members in the light modulating material layer member, i.e. .

A light-light conversion element PPCe (or PPCm) is used as light whose light intensity is changing in accordance with the optical image of the subject.
Compared to conventional light-to-light conversion elements, where the light emitted from the light-to-light conversion element is converted into light with varying intensity by an analyzer before use. It also has the advantage of being able to use light efficiently.

The readout light is converted into a light-to-light conversion element P P Ca (or PP
Cm) may be incident from a direction other than the normal to the plane of the light-to-light conversion element PPCe (or PPCm); therefore, it is not necessary to provide a half mirror or a polarizing beam splitter in the optical path of the readout light. This provides the advantage that the configuration of the device can be simplified. This point also applies to the imaging device described later.

However, as shown in FIGS. 1 and 2, for example, the readout light incident from a direction other than the normal to the surface of the light-to-light conversion element PPCe (PPCm) corresponds to the optical image of the subject and is The image on the screen S that is emitted from the light-to-light conversion element PPCe (or PPCm) as light whose intensity is changing and is projected onto the screen S by the projection lens Lp is the result of the results at each part of the screen S. The state of the image is different, and at the same time, the image magnification in each part of the screen S is different.

FIG. 20 shows the light-light conversion element P P Ce (P P C
m) from a direction other than the normal to the surface of the light-light conversion element PPCe.
An example of a configuration is shown in which an image with the same magnification and good imaging condition can be projected onto the screen S over the entire surface of the screen S even when the readout light RL is incident on the (PPCm). In Fig. 20, L
S is a light source, Lcn is a condenser lens, Lp is a projection lens, and S is a screen.

In FIG. 20, a light-light conversion element PPCe (PPCm
), the projection lens Lp, and the screen S.

In a state where the imaging plane of the light-light conversion element PPCa (PPCm), the main plane of the projection lens Lp, and the screen S are parallel, the center of the imaging plane of the light-light conversion element ppcθ (PPCm) and the projection lens They are arranged so that the principal point of LP and the center of screen S are located on one straight line.

Light-light conversion element PPCa (PPCm) and projection lens Lp
When the screen S and the screen S are arranged so as to satisfy the above-mentioned conditions, the readout light from the light source LS passes through the condenser lens Lcn to the light-to-light conversion element PPCa.
(or PPCm), even if it is incident obliquely on the surface of the screen S, the image is formed in good condition over the entire surface of the screen S, and an image with the same magnification is projected on any part of the screen S. Because it is done in the state where it was done, it is h.

Next, FIG. 19 shows a light-to-light conversion element PPCe (PPCm) in which a light incident surface and a light exit surface are configured in a curved shape. In FIG. 19, BPI and BF2 are support substrates such as glass plates.

Light-light conversion element PPC:a(
PPCm) has a reflecting mirror MΩ and a transparent electrode Et1. aVac, which is constructed by sequentially laminating the light modulating material layer member HLL (HL M), the photoconductive layer member PCL, the transparent electrode Et2° and the support substrate BP2, is a power supply connected between the above-mentioned electric terminals NEtl and EtZ. be.

And as a light-light conversion element PPCa (PPCm),
In the light-to-light conversion element PPCa (PPCm) in which the light incident surface and the light exit surface are configured in a curved shape, it is also possible to simplify the configuration of the optical system.

The shape of the curved surfaces to be formed on the light incident surface and the light exit surface of the light-light conversion element PPCe (PPCm) described above may be, for example, a part of a spherical surface, a part of a spheroidal surface, or a cylindrical shape. , or any other curved shape.

For example, a light-to-light conversion element PPCa (PPCm) having a concave mirror-like surface, such as the light-to-light conversion element PPCa (PPCm) illustrated in the side vertical cross-sectional view of FIG. By utilizing the light condensing effect due to the curved shape of the light conversion element PPCe (PPCm) itself, an image is formed on the screen S as in the display device illustrated in FIG. 21 without using any other projection lens. You can also do that.

In FIG. 21, LS is a light source, Lcn is a condenser lens, and PPCa (PPCm) is, for example, the 19th
This is a light-to-light conversion element having a concave mirror-like surface as illustrated in the figure.

The readout light emitted from the light source LS is transmitted to the light-to-light conversion element PPCe (PPCm) in which writing is performed as described above through the condenser lens Lcn, which has a concave mirror-like surface. Photoconversion element PPCe (PPCm)
When the incident light goes back and forth through the light modulating material layer member, it exits from the concave mirror-like surface as light whose intensity is modulated according to the information contained in the 1F and onto the screen S. It can be imaged.

Figure 22 shows a light-light conversion element p having a concave mirror-like surface.
The incidence of the writing light on the pca (ppcm) and the incidence of the continuous light RL are connected to the light-to-light conversion element PPCe (PPCm).
This is an example in which the light-to-light conversion elements PPCs (PPCm, PPCm,
) is constructed using a material that is sensitive to light in the wavelength range of the writing light but insensitive to light in the wavelength range of the reading light as its photoconductive layer member. ing.

In the display device shown in FIG. 22, LSQ is a laser light source that emits laser light whose intensity is modulated by a write signal, DEF is an optical deflector, and RL is read light emitted from a light source (not shown).

Lp is a projection lens that images the readout light emitted from the light-to-light conversion element PPCe (PPCm) onto the screen S in a state where the intensity is modulated according to the information to be displayed.

Figure 23 shows a light-to-light conversion element P P Ca (P P Cm ) in which a light incident surface and a light exit surface are configured in a curved shape.
This is an embodiment of a display device including a light-to-light conversion element PPC:e (PPCm) that allows writing light to enter from the concave side and read light to enter from the convex side.

The light-to-light conversion element PPCa (P
PCm), the transparent electrode Et1.
Photoconductive layer member PCL, dielectric mirror DML, light modulating material layer member HLL (HLM), transparent electrode Et2, support substrate BP
2 are sequentially stacked. Vac is a power supply connected between the electrodes Etl and EtZ.

In FIG. 23, LSΩ is a laser light source that emits laser light whose intensity is modulated by a write signal, Ll is a lens, DEF is an optical deflector, and LS is a light source that emits read light.

Lcn is a condenser lens, and LP is a projection lens that images the readout light emitted from the light-to-light conversion element PPCθ (P P Cm) onto the screen S in a state where the intensity is modulated according to the information to be displayed. .

FIG. 24 shows a light-to-light conversion element PPCe (PPCm) in which the light incident surface and the light exit surface are configured in a curved shape, in which writing light and reading light are incident from the concave side, and reading light is input from the convex side. This is an embodiment in which the light is emitted and the image is formed on the screen S by the projection lens Lp,
In the figure, LSI2, LSQ is a laser light source that emits laser light whose intensity is modulated by a write signal, DE Fl± optical deflector, LS is a light source that emits read light, and LCn is a condenser lens. It is.

In the display device shown in FIG. 24, a transmission type light-to-light conversion element PPCe (PPCm) is used, and this light-to-light conversion element PPCe (PPCm) is a photoconductive layer member thereof. A device is used that is sensitive to light in the wavelength range of the writing light but insensitive to light in the wavelength range of the read light.

The combinations of the incident directions of the writing light and the reading light in the light-to-light conversion element P P Ce (P P Cm ) in which the light incident surface and the light exit surface are configured in a curved shape include each of the above-mentioned combinations. In addition to those exemplified in the examples, (1) When the light-to-light conversion element PPCe (PPCm) is a reflective type, writing is performed from the convex side and reading is performed from the concave side, and both writing and reading are performed from the convex side. ■ When the light-to-light conversion element PPCa (PPCm) is a transmission type, writing is performed from the convex side and reading from the concave side, both writing and reading are performed from the convex side, writing and reading are performed from the convex side. A combination mode such as 0 is possible in which both of the steps are performed from the concave side. Further, although the light source has been described as a laser light source in the descriptions so far, it goes without saying that any light source other than an LED may be used as the light source.

Next, a light-to-light conversion element PPCep is constructed using a photoconductive layer between at least two electrodes and a light modulating material layer member made of PLZT porcelain whose light scattering state changes repeatedly depending on an electric field. The specific contents of the image pickup device will be explained with reference to FIGS. 14 to 18. In each figure, Etl and Et2 are transparent electrodes, PCL
is a photoconductive layer member, DML is a dielectric mirror, PLZT is a light modulating material layer member made of PLZT porcelain whose light scattering state changes repeatedly depending on the electric field, and WL is a writing light, R
L indicates reading light and EL indicates erasing light.

In the imaging device shown in FIG. 14, L is an imaging lens, and the optical image of the subject is captured by the imaging lens L into the photoconductive layer member P.
The image is formed on CL. When optical information is written to the light-to-light conversion element P P Ce p, the voltage w4Etl of P P Ce p of the light-to-light conversion element.

The voltage of the power supply vb is supplied to Et2 via the movable contact V and fixed contact WR of the changeover switch SW, and an electric field is applied between both ends of the photoconductive layer member PCL7.

When the writing light WL incident on the light-to-light conversion element PPCep passes through the transparent electrode Etl and reaches the photoconductive layer member PCL4, the electrical resistance value of the photoconductive layer member PCL corresponds to the optical image caused by the incident light that has reached it. As a result, a charge image corresponding to an optical image caused by the incident light reaching the photoconductive layer member PCL is generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML.

The optical information written in the form of a charge image corresponding to the optical image by the Oikun light as described above is transferred to the light-light conversion element P.
To reproduce from PCe p, the movable contact V of the changeover switch SW is switched to the fixed contact WR side, and the voltage of the power supply vb is applied between the transparent electrodes Etl and EtZ.

Readout light R with constant light intensity from a light source (not shown)
This can be done by projecting L.

A photoconductive layer member PCL is provided at the interface between the photoconductive layer member PCL and the dielectric mirror DML in the light-to-light conversion element PPCap where optical information has been written by incident light as described above.
Since a charge image corresponding to the optical image caused by the incident light that has reached is generated, the light modulating material layer member PLZT, which is provided in series with the dielectric mirror DML with respect to the photoconductive layer member PCL, is applied with an electric field having an intensity distribution corresponding to the optical image formed by the incident light.

Since the light modulating layer member PLZT described above changes depending on the electric field due to the electro-optic effect, the photoconductive layer member PCL described above is subjected to an electric field with an intensity distribution corresponding to the optical image caused by the incident light. A light modulating material layer member P provided in series with the dielectric mirror DML.
The refractive index of LZT is determined by the optical value of the incident light that reaches the photoconductive layer member PCL at the interface between the photoconductive layer member PCL and the dielectric mirror DML in the light-to-light conversion element by writing optical information using the incident light as described above. The image changes depending on the charge image generated in correspondence with the image.

So, when the readout light RL is projected.

The readout light RL is transmitted from the transparent electrode Et2 to the light modulating material layer member PL.
The readout light RL proceeds as ZT→dielectric mirror DML→2, and then is reflected by the dielectric mirror DML and returns to the transparent electrode EtZ side as reflected light, but the reflection of the readout light RL Due to the electro-optic effect of the light modulating material layer member PLZT, the light contains image information according to the intensity distribution of the electric field applied to the light modulating material layer member PLZT, and the light becomes transparent [corresponding to the optical image by the incident light on the Et2 side] produces a reconstructed optical image.

As is clear from the above description, the light-light conversion element PP
The dielectric mirror DML in Cap is a transparent electrode Et2
Readout light RL incident on the light modulating material layer member PLZT from the side
The readout light RL is reflected onto the light modulating material layer member PLZT.
The photoconductor layer member pcL is prevented from transmitting through the photoconductor layer member pcL.

As a result, a problem arises when the readout light RL is transmitted from the light modulating material layer member PLZT to the photoconductive layer member PCL.
The light guide fi is transmitted through the photoconductive layer member PCL.
[This can prevent the problem that the charge image existing at the boundary between the member PCL and the vItt body mirror DML is disturbed.

In order to erase the information written by the write light WL as described above, the movable contact V in the changeover switch SW is switched to the fixed contact E side, and the light-to-light conversion element P is
After making sure that no electric field is generated between the transparent electrodes Etl and EtZ in PCep.

The erasing light EL having a -like intensity distribution is made incident from the transparent electrode Etl which is the incident side of the writing light WL.

The imaging device shown in FIG. 15 is equipped with an optical shutter ST that prevents the light that has passed through the imaging lens L from being supplied to the light-to-light conversion element PPCap. After forming an optical image of the subject on the photoconductive layer member PCL of the light-to-light conversion element PPCep,
When the optical shutter ST is closed, an optical image of the subject is formed on the interface between the photoconductive layer member PCL and the dielectric mirror DML in the light-to-light conversion element PPCep as described with reference to No. 141. It is also possible to retain the correspondingly generated charge image for a long period of time.

Further, an optical image of the subject is formed on the photoconductive layer member PCL of the light-to-light conversion element PPCe p by dividing the time using the optical shutter ST described above.
Light guide itN member PCL and dielectric mirror DML at p
It is also possible to generate a charge image corresponding to the optical image of the subject at the interface between the two and scan the input image information to read it out.

In the imaging device shown in FIG. 16, optical information is written by incident light in a confusing manner, and an optical image of the object is formed on the interface between the photoconductive layer member PCL and the dielectric mirror DML in the light-to-light conversion element PPC6P. In order to read the charge image corresponding to , the light from the laser light source LSn is deflected as the readout light RL by the optical deflector DEF, and then passed through the lens 5 and the beam splitter BS to the transparent electrode Et2 of the light-to-light conversion element PPCap. The light enters from the side, and the light-light conversion element ppCa
The configuration is such that reproduction light emitted from the transparent electrode Et2 side of p is applied to the lens 6 via the beam splitter BS, converted into a video signal by the photoelectric converter PD, and sent to the output terminal 7.

The photoelectric converter PD in the imaging device shown in FIG.
An appropriate type (photodiode, one-dimensional image sensor) is used depending on the deflection mode in the optical deflector DEF.

Note that the light emitted from the lens 6 described above may be supplied to the optical signal processing device in its optical state without photoelectric conversion, and the desired signal processing may be performed (this point is explained in the 17th section).
The same applies to the illustrated imaging device). In FIG. 16, ESL is a light source for erasing light EL (the same applies to FIGS. 17 and 18).

In the imaging device shown in FIG. 17, optical information is written by incident light as described above, and the light-to-light conversion element P P Ca
Photoconductive layer member PCI and dielectric mirror DM in p
In order to read a charge image corresponding to the optical image of the object on the interface with L, the reproduction light emitted from the reproduction light source 7 as the readout light RL is converted into a large-area light beam by the lens 8, and then the beam splitter BS is used. Through the light-light conversion element PP
Reproduction light is input from the transparent electrode Et2 side of the light-to-light conversion element PPCap and is emitted from the transparent electrode Et2 side of the light-to-light conversion element PPCap, and is applied to the lens 9 via the beam splitter BS.

The configuration is such that the two-dimensional image sensor 10 converts the signal into a video signal.

Further, in the imaging device shown in FIG. 18, optical information is written by incident light as described above, and the light-to-light conversion element P P
A laser light source LS is used as readout light RL to read a charge image corresponding to the optical image of the object on the interface between the photoconductive layer member PCL and the dielectric mirror DML in Csp.
After the light from Q is deflected by the light deflector IIIDEF, it enters the transparent electrode Et2 side of the light-to-light conversion element PPCeP through the lens 5 and the beam splitter BS, and exits from the transparent electrode Et2 side of the light-to-light conversion element PPCap. The configuration is such that reproduction light is applied to a lens 11 via a beam splitter BS, and the light emitted from the lens 11 is imaged on a recording medium F and recorded on the recording medium F.

In FIG. 18, reference numerals 13 and 14 indicate a take-up reel and a delivery reel for the recording medium F, and 15 indicates the sub-scanning direction of the recording medium. As the recording medium F, any one can be used, such as an optical recording medium or a recording medium that records an optical image as a charge image.

Next, FIGS. 25 to 27 are diagrams showing configuration examples of an imaging device in which readout light is made to enter the light-to-light conversion element from a direction other than the normal to the surface of the light-to-light conversion element. can be,
First, the imaging device shown in FIG. 25 reads out a surface opposite to the surface of the light-to-light converter PPCa (PPCm) on which the writing light is incident in a direction different from the normal to that surface. This is an example in which light is made incident, and by doing so, it is not necessary to provide a half mirror in the optical path of the readout light, so it is possible to simplify the configuration of the device and improve the light utilization rate. .

In Fig. 25, O is the subject, L is the imaging lens, P P
Ce (P P Cm) is a light-to-light conversion element, LSQ is a laser light source used as a light source of readout light, DEF is a light deflector, and PD is a photodetector. Note that it goes without saying that a light source other than a laser may be used as the light source for the readout light.

In addition, instead of reading information by scanning a light beam, a large area of readout light is transmitted to the light-to-light conversion element PPCe (P
It is also possible to irradiate the surface of PCm) and obtain a video signal using a two-dimensional image sensor.

Figures 26 and 27 show a light beam with a concave mirror-like surface.
This figure shows a configuration example of an imaging device configured using a light conversion element P P Ce (P P Cm ), and the second
Figure 6 shows that the incidence of the writing light and the incidence of the reading light RL are
This is an example in which writing is performed from the same surface in a light conversion element PPCa (PPCm), and in this example, the wavelength of the writing light is used as a photoconductive layer member in a light-to-light conversion element PPCe (PPCrn). Although it is sensitive to light in the area.

A device constructed using a material that is insensitive to light in the wavelength range of the readout light is used.

In the imaging apparatus shown in FIGS. 26 and 27, 0 is a subject, L is an imaging lens, LSQ is a laser light source that emits readout light, DEF is a light deflector, and PD is a photodetector.

In addition, the imaging device illustrated in FIG.
A light-to-light conversion element PPCe (PPCm) is configured to allow writing light having optical information of a subject to enter from the convex side of P Ce (P P Cm ) and to allow read light to enter from the concave side. This is an example of an imaging device.

Note that the present invention is applicable not only to display devices and imaging devices.

It can also be used as a light modulation device in an optical computer or the like.

(Effects of the Invention) As is clear from the above detailed explanation, the display device of the present invention has at least a photoconductive layer member and a scattering mode display device between two transparent electrodes to which a predetermined voltage is applied. Electromagnetic radiation containing information to be displayed or imaged is applied to the photoconductive layer member through a transparent electrode on the photoconductive layer member side of the light-to-light conversion element constituted by the operable light modulating material layer member. . means for producing a charge image corresponding to electromagnetic radiation containing the information to be displayed between the photoconductive layer member and the light modulating material layer member;

(5) scattering of light corresponding to electromagnetic radiation information in the light modulating material layer member using electromagnetic radiation; Since this is an application device of a light-to-light conversion element comprising a means for reading out and displaying a change in the degree of change in the degree of change in the degree of light and a means for converting the read optical information into an electrical signal, the application of the light-to-light conversion element of the present invention is In the device, the readout light emitted from the light-to-light conversion element is in a state where the light intensity changes in accordance with the information to be displayed, and the readout light emitted from the light-to-light conversion element is changed as it is. It can be projected onto a screen using a projection lens, and like readout light emitted from a conventional light-to-light conversion element, it can be used after being converted into light with varying light intensity by an analyzer. Compared to when there is
The structure can be simplified, light can be used efficiently, and information to be displayed can be shortened by using a light-to-light conversion element that has a good storage function for high-resolution image information. Even if only a certain amount of time is given, it is possible to display images with high resolution and good quality over a long period of time.Furthermore, when the application device of the light-to-light conversion element of the present invention is implemented as an imaging device, high resolution can be achieved. A light-to-light conversion element uses PLZT porcelain as a light modulating material layer member, which can easily generate a video signal, and the light scattering state changes in reverse when an electric field is applied. Due to the high impedance of the PLZT porcelain that constitutes the device, it has high charge image retention performance, which is advantageous when displaying still images by repeating readout operations.

Furthermore, if the imaging device is equipped with an optical shutter, it is possible to scan and read out images inputted in time sections, and furthermore, the readout light incident on the light-to-light conversion element can be directed to the surface of the light-to-light conversion element. By setting the direction in a direction different from the normal direction of the light, the efficiency of light usage is increased.

In addition, the present invention has the above-mentioned excellent effects, such as simplifying the configuration of the optical system by using a light-to-light conversion element in which the light entrance surface and the light exit surface are configured in a curved shape. can be played.

[Brief explanation of the drawing]

1 to 7 and 20 to 24 are side views of embodiments of the display device, and FIGS. 8 to 13, and 15 and 19 are side views for explaining the light-to-light conversion element. Side view, 14th
16 to 18 and 25 to 27 are side views of embodiments of the imaging device. 0...Subject, L...Imaging lens, PPCe, PP
C, m, PPCap...light-light conversion element, vb...
power supply. WL...Writing light, RL...Reading light, Etl,
E t2...Transparent electrode, PCL...Photoconductive layer member, DML...Dielectric mirror, MQ...Reflector, HL
L...Light modulating material layer member constructed using a polymer-liquid crystal composite film in which high-resistance liquid crystal is dispersed in a polymer material, ELS・
...Light source for erasing, ELSQ...Laser light source for erasing, LS...Light source of readout light, DEF...Optical deflector,
La...Lens, HEC...Heating power supply, E L
S Q...Laser light source for erasing, M...Reflector, H
EL...heating layer, HLM...light modulating material layer member constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material, PLZT...light scattering state is changed by application of an electric field. Light modulating material layer member constructed using PLZT porcelain that changes repeatedly, BS...beam splitter, F...
Recording medium, HIL...heat absorption layer, S...screen, PD...photodetector. Lcn... Condenser lens, Lp... Projection lens, Ll, L2, 1... Schlieren input mask, 2,
5゜6.8, 9.11... Lens, 3... Schlieren output mask, 4... Dichroic mirror 7.
...Output terminal, 10...Two-dimensional image sensor, 13
, 14... reel. Ko 22 Mountain 1) 250

Claims (1)

[Claims] 1. A light-to-light conversion element constituted by at least a photoconductive layer member and a light modulating material layer member capable of operating in a scattering mode between two electrodes to which a predetermined voltage is applied. Electromagnetic radiation containing the information to be displayed is applied to the photoconductive layer member through the electrode on the side of the photoconductive layer member, and the above-described target for display is provided between the photoconductive layer member and the light modulating material layer member. means for generating a charge image corresponding to electromagnetic radiation containing information stored in the image; means for causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image; A display device 2 comprising a means for reading out and displaying electromagnetic radiation information in the light modulating material layer member and a change in the degree of scattering of light corresponding to the above-mentioned light modulating material layer member, and two electrodes to which a predetermined voltage is applied. In between, photoconductivity in a light-to-light conversion element constituted by at least a photoconductive layer member and a light modulating material layer member constituted using a polymer-liquid crystal composite film in which high-resistance liquid crystals are dispersed in a polymer material. Electromagnetic radiation containing information to be displayed is applied to the photoconductive layer member through an electrode on the side of the layer member, so that the above-described information to be displayed is provided between the photoconductive layer member and the light modulating material layer member. means for generating a charge image corresponding to electromagnetic radiation containing information; and an object to be displayed on the polymer-liquid crystal composite film by changing the orientation state of the liquid crystal of the light modulating material layer member by an electric field caused by the charge image. means for generating an image of a change in the alignment state of a liquid crystal corresponding to electromagnetic radiation containing information displayed on the display; A display device 3 comprising a means for reading out and displaying an image of a change in the orientation state of a liquid crystal corresponding to radiation; at least a photoconductive layer member and a polymer between two electrodes to which a predetermined voltage is applied; Displayed through an electrode on the photoconductive layer member side of a light-to-light conversion element constructed by a light modulating material layer member constructed using a polymer-liquid crystal composite film in which high-resistance liquid crystals are dispersed in the material. applying electromagnetic radiation containing information to the photoconductive layer member to produce a charge image between the photoconductive layer member and the light modulating material layer member corresponding to the electromagnetic radiation containing the information to be displayed; and a liquid crystal corresponding to electromagnetic radiation containing information to be displayed on the polymer-liquid crystal composite film by changing the alignment state of the liquid crystal of the light modulating material layer member by an electric field caused by the charge image. means for generating an image of a change in the orientation state of the liquid crystal, and a means for using electromagnetic radiation to read out an image of a change in the orientation state of the liquid crystal corresponding to the electromagnetic radiation containing information to be displayed in the polymer-liquid crystal composite film. A display device 4 comprising means for displaying a charge image using electromagnetic radiation for erasing, and means for erasing the charge image using electromagnetic radiation for erasing, includes at least a photoconductive layer between two electrodes to which a predetermined voltage is applied. A display target is transmitted through an electrode on the photoconductive layer member side of a light-to-light conversion element constructed by a light modulating material layer member constructed using a polymer-liquid crystal memory film in which liquid crystals are dispersed in a polymer material. Electromagnetic radiation containing the information to be displayed is applied to the photoconductive layer member to form a charge image corresponding to the electromagnetic radiation containing the information to be displayed between the photoconductive layer member and the light modulating material layer member. and changing the orientation state of the liquid crystal in the polymer-liquid crystal memory film of the light modulating material layer member by an electric field caused by the charge image, and changing the orientation state of the liquid crystal in the polymer-liquid crystal memory film. and means for reading out and displaying an image of a change in the alignment state of the liquid crystal corresponding to the electromagnetic radiation containing the information stored in the polymer-liquid crystal memory film and being the object of display using electromagnetic radiation. A display device 5 comprising: a display device 5 comprising at least a photoconductive layer member and a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material between two electrodes to which a predetermined voltage is applied; Electromagnetic radiation containing information to be displayed is applied to the photoconductive layer member through the electrode on the photoconductive layer member side of the light-to-light conversion element configured with the light modulating material layer member, and the photoconductive layer member is means for generating a charge image corresponding to the electromagnetic radiation containing the information to be displayed between the light modulating material layer member and the light modulating material layer member; A means for changing the orientation state of liquid crystal in a polymer-liquid crystal memory film and storing the changed orientation state of the liquid crystal in the polymer-liquid crystal memory film, and a display object stored in the polymer-liquid crystal memory film. means for reading out and displaying an image of a change in the alignment state of a liquid crystal corresponding to electromagnetic radiation containing information stored in the memory using electromagnetic radiation; a display device 6 comprising a means for erasing the charge image using electromagnetic radiation; Electromagnetic radiation containing information to be displayed is applied to the photoconductive layer member through an electrode on the photoconductive layer member side of the light-to-light conversion element configured with a light modulating material layer member that can be displayed. means for generating a charge image corresponding to the electromagnetic radiation containing the information to be displayed between the member and the light modulating material layer member; and the light modulating material layer member described above by an electric field caused by the charge image. means for causing a change in the degree of scattering of light, and means for reading and displaying a change in the degree of scattering of light corresponding to the electromagnetic radiation information in the light modulating material layer member using readout electromagnetic radiation; In a display device comprising: a readout electromagnetic radiation to be incident on the light-to-light conversion element, the main optical axis thereof is different from the normal direction of the light-to-light conversion element; A display device 7 configured to allow the light to enter a conversion element, is composed of at least a photoconductive layer member and a light modulating material layer member capable of operating in a scattering mode, between two electrodes to which a predetermined voltage is applied. Electromagnetic radiation containing information to be displayed is applied to the photoconductive layer member through the electrode on the photoconductive layer member side of the light-to-light conversion element, and the electromagnetic radiation containing the information to be displayed is applied to the photoconductive layer member to create a space between the photoconductive layer member and the light modulating material layer member. means for generating a charge image corresponding to the electromagnetic radiation containing the information to be displayed, and causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image; and means for reading out and displaying the electromagnetic radiation information and the change in the degree of scattering of light corresponding to the electromagnetic radiation information in the light modulating material layer member using readout electromagnetic radiation. A display device 8 using a conversion element having a curved light entrance surface and a light exit surface, at least a photoconductive layer member is placed between two electrodes to which a predetermined voltage is applied. and a light modulating material layer member capable of operating in a scattering mode, an electromagnetic radiation image of the subject is formed on the photoconductive layer member by an imaging lens through an electrode on the photoconductive layer member side of the light-to-light conversion element. a means for generating a charge image corresponding to the electromagnetic radiation image of the subject between the photoconductive layer member and the light modulating material layer member; Imaging comprising means for causing a change in the degree of scattering, and means for reading out a change in the degree of scattering for light corresponding to the electromagnetic radiation image in the light modulating material layer member using readout electromagnetic radiation. In the apparatus, the readout electromagnetic radiation to be made incident on the light-to-light conversion element is made to enter the light-to-light conversion element such that its main optical axis is different from the normal direction of the light-to-light conversion element. An image pickup device 9 constructed as described above includes a light-to-light conversion element constituted by at least a photoconductive layer member and a light modulating material layer member capable of operating in a scattering mode between two electrodes to which a predetermined voltage is applied. An electromagnetic radiation image of the subject is formed on the photoconductive layer member through the electrode on the photoconductive layer member side by an imaging lens, and the electromagnetic radiation image of the subject described above is formed between the photoconductive layer member and the light modulating material layer member. means for generating a charge image corresponding to the charge image; means for causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image; In an imaging device comprising a means for reading out an electromagnetic radiation image in a modulating material layer member and a change in the degree of scattering of light corresponding to the image, the light incident surface and the light exit surface are curved as a light-light conversion element. An imaging device 10 using the above configuration includes a photoconductive layer between at least two electrodes and a light modulating material layer member made of PLZT porcelain whose scattering state of light changes repeatedly depending on an electric field. A light-to-light conversion element 11 comprising a photoconductive layer between at least two electrodes and a light modulation material layer member made of PLZT porcelain whose light scattering state changes repeatedly by an electric field. means for causing electromagnetic radiation for writing to be incident on the photoconductive layer member described above to generate a charge image corresponding to the electromagnetic radiation for writing, and light modulation to which an electric field due to the charge image is applied. An imaging device 12 comprising means for making readout electromagnetic radiation incident on a material layer member, and means for emitting readout electromagnetic radiation from a light modulating material layer member made of PLZT porcelain whose light scattering state changes repeatedly depending on an electric field. , on the photoconductive layer member side of a light-to-light conversion element configured to include a photoconductive layer between at least two electrodes and a light modulating material layer member made of PLZT porcelain whose scattering state of light is repeatedly changed by an electric field. Electromagnetic radiation containing information to be displayed is applied to the photoconductive layer member through the electrode, and between the photoconductive layer member and the light modulating material layer member made of PLZT porcelain whose scattering state of light is repeatedly changed by an electric field. means for generating a charge image corresponding to the electromagnetic radiation containing the information to be displayed, and an electric field caused by the charge image to cause the light modulating material layer member made of PLZT porcelain to vary the degree of scattering of light; A display device comprising means for causing a change, and means for reading and displaying a change in the degree of scattering of light corresponding to electromagnetic radiation information in the light modulating material layer member made of PLZT porcelain using electromagnetic radiation.