JPH11271799A - Picture display plate and picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain display with high resolution in a reflective picture display plate having the holding function of the display state of picture information, and to easily manufacture this. SOLUTION: This picture display plate can be irradiated with a writing light from a direction Y1 opposite to a direct viewing direction X1. A light carrier is generated in the part which is irradiated with the writing light on an optical address layer 23, and phase shift or the change of an oriented state is generated in a picture recording layer 25 due to the change of voltage distribution generated due to this, and a picture is formed at that part. A DC voltage is applied to an electrode layer 22 and a transparent electrode layer 26 so that the picture recording layer 25 can be heated, and the phase shift or the change of the oriented state can be promoted. Also, the voltage is applied to the electrode layer 22 and the transparent electrode layer 26 so that a recorded picture can be eliminated. A rear support 21 and a front supporting body 27 are formed for supporting the picture recording layer 25. A dielectric layer 24 absorbs a visible light beam made incident from the direction X1. Thus, a part where the picture is recorded can be obtained with brightness different from that of the other parts, and the picture can be easily recognized by direct viewing from the direction X1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display panel having a function of maintaining a display state of image information and an image display apparatus, and more particularly to an image display panel which forms an image by heating.
And an image display device.

[0002]

2. Description of the Related Art Conventionally, an electric address type liquid crystal display is most often used as a flat panel display. Electric address type liquid crystal display
Since they are smaller in volume and lighter than CRTs, they are used in various fields mainly for portable terminal devices. But,
A conventional electric address type liquid crystal display has a display resolution of 100 dpi or less and does not satisfy the minimum resolution of the human eye under use conditions. For this reason, the liquid crystal display has a problem in that when displaying fine characters and the like, a load is imposed on the visual ability of the user.

On the other hand, self-luminous displays such as CRTs and plasma displays also have a low display resolution like a liquid crystal display, and impose a burden on a user's visual ability. In addition, since the self-luminous display does not have a function of adjusting to an ambient lighting environment, it cannot maintain appropriate luminance, and this also imposes a burden on the visual ability of the user. In addition, a liquid crystal display using a backlight has the same problem in that it does not have a function of adjusting the surrounding illumination environment.

In addition, many displays require a few seconds to a few seconds.
The display screen is drawn at a speed of several tens of frames, and unnecessary energy is consumed when viewing still image information.

[0005] Examples of displaying a still image on an electric display include an electronic book displaying newspaper articles and dictionary data, and HTML (Hy
perText Markup Language) documents. In displaying a still image centering on character information, it is ideal to have optical characteristics similar to those of a normal printed matter. Optical characteristics of the printed material include a white scatterer having high reflectance, a high-contrast character display capability, and a low viewing angle dependency. Since paper most frequently used as a printing target is a reflector, it has a self-adjustment function in which the luminance changes according to a change in ambient illumination. The reflectance is more than 60% for newspaper and 80% for coated paper.
And high.

Therefore, when viewing in a bright place, the brightness is high and the burden on human visual ability is small. Furthermore, in the case of a printed matter, since it is formed with a high resolution of 300 to 600 dpi or more, even when directly viewed at a close distance of 30 to 60 cm, image information is formed with a resolution exceeding the minimum resolution of human vision. Therefore, it can be recognized as a continuum, and in this respect too, the burden on visual ability is small.

On the other hand, a liquid crystal light valve system in which a driving circuit is formed on a Si crystal by IBM (Paul M. Al) is one that realizes high resolution on a display.
t; Conference Record of the 1997 International Disp
lay Research Conference and International Workshop
on LCD Technology and Emissive Technology (1997), M
-19). In this method, a high-resolution electrically-addressable reflective liquid crystal display using a processing technology and a processing device of a Si integrated circuit as it is is created. This display has a fine pixel pitch of 17 μm × 17 μm,
Assuming a direct view type, the chip resolution is 1500d
pi.

However, since the liquid crystal light valve type display always redraws an image, the power consumption is higher than that of a display having a memory function. In addition, since this display is manufactured using an LSI process on a Si substrate, a display larger than a Si wafer cannot be manufactured, and when a large direct-view type display is manufactured, cost increases. There is a problem that becomes. For this reason, IBM uses this display as a member of a projection display. Another problem is that the projection display does not have a self-adjustment function with respect to the ambient lighting environment, like the self-luminous display.

Therefore, a display for displaying a still image, which is of a reflection type, has a high luminance, and has a high resolution, is required. In a display for displaying a still image, when power consumption is considered, it is not necessary to refresh the screen except for rewriting display information. As a device that satisfies this requirement, there is a reflection type display that does not require refreshing by giving a liquid crystal display panel a memory function.

[0010] As a first example of such a display, M. Kent of Kent University. Some use the phase change of cholesteric liquid crystal performed by Pfeiffer et al. (Society fo
r Information Display International Symposium Dige
st of Technical Papers XXVI (1995), 706-). This display selects a focal conic mode as a scatterer and a planar mode with high transmittance depending on the applied voltage, and has a visible light absorbing layer made of a dye on the back of the display to provide high contrast and high reflection. The rate has been realized.

A second example is disclosed in Japanese Patent Laid-Open No. 1-25
As disclosed in Japanese Patent Application Laid-Open No. 0926, a liquid crystal display panel that can be addressed by a laser is provided to provide a high-resolution and high-contrast display.

As a third example, there is a spatial light modulator as a display which does not require fine processing of electrodes. This display is a display that collectively exposes image information or forms an image by high-definition drawing using a laser. Since the entire display is formed by a pair of electrodes facing each other, fine processing is not required.

[0013]

However, in the first example, in order to realize a high resolution, it is necessary to reduce the pixel size. For this purpose, the electrode panel must be miniaturized, which causes a problem that an adjacent electric field is affected by an electric field and a processing cost increases.

On the other hand, the second example is used as a projector member, and when viewed directly, paper white light scattered by liquid crystal or mirror reflected light without scattering is directly viewed. . For this reason, a monochrome image such as a printed matter cannot be formed, and the image is like a character written with white paint on a mirror.

The third example is also used as a projector member, and the image when viewed directly gives the same result as in the second example. The present invention has been made in view of such a point, and it is an object of the present invention to provide an image display plate and an image display device which are capable of performing high-resolution display while being of a reflection type, and are easy to manufacture. .

[0016]

According to the present invention, in order to solve the above-mentioned problems, in an image display panel having a function of maintaining a display state of image information, an optical addressing layer for generating photovoltaic power for a specific wavelength is provided. The image information is formed by causing a phase transition or a change in the orientation state in response to a change in the voltage distribution caused by the photovoltaic power of the optical address layer, and maintaining the state after the phase transition or in the changed orientation state. An image display panel, comprising: an image recording layer, and a dielectric layer formed between the image recording layer and the optical address layer and absorbing visible light transmitted through the image recording layer. You.

In such an image display plate, optical carriers are generated, for example, by using a laser in a portion of the optical address layer corresponding to a portion of the image recording layer to be displayed.
As a result, a phase transition or a change in the alignment state occurs in the corresponding portion of the image recording layer, so that the reflectance and the transmittance change, thereby enabling high-resolution display. At this time, since switching for each pixel is unnecessary, high-resolution display can be performed without using fine electrodes.

Further, since the dielectric layer absorbs visible light transmitted through the image recording layer, it can be directly viewed from the front side of the liquid crystal display panel. Further, since the state after the phase transition or the change in the orientation state is maintained, the written content can be maintained once the writing is performed.

In addition, depending on the material system, information can be held at a voltage lower than the voltage at the time of writing or without applying a voltage.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a schematic configuration of the image display device according to the first embodiment of the present invention. The image display device 10
Mainly, light output device 11, polygon mirror 12, deflector 1
3 and an image display panel 20. The light output device 11 outputs the writing light 14. Writing light 1
As 4, for example, an infrared laser is used. The writing light 14 is reflected by the rotating polygon mirror 12 and directed to the right in the drawing, and passes through the deflector 13 so as to be directed in a direction perpendicular to the plane of the drawing.
It is irradiated to 0. On the display surface of the image display panel 20, the brightness of the portion irradiated with the writing light 14 changes. Specific operation control of the image display device 10 will be described later.

FIG. 1 shows an image display panel 2 according to a first embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a specific configuration of the reference numeral 0. Image display board 20
The back support 21, the electrode layer 22, the optical address layer 23, and the dielectric layer 2
4. An image recording layer 25, a transparent electrode layer 26, and a front support 27 are formed. For this image display plate 20, the writing light 14 is directed in a direction Y1 opposite to the direct viewing direction X1.
Irradiation only from

On the optical address layer 23, the writing light 14
Irradiation generates photocarriers, and the resulting change in voltage distribution causes a phase transition or a change in the alignment state in the image recording layer 25, and the brightness of the portion changes, forming an image. The electrode layer 22 and the transparent electrode layer 2
By applying a voltage to 6, the recorded image is erased. The rear support 21 and the front support 27 are formed to support the electrode layer 22, the optical address layer 23, the dielectric layer 24, the image recording layer 25, and the transparent electrode layer 26. The dielectric layer 24 absorbs visible light incident from the direction X1. As a result, the portion where the image is recorded has a brightness different from that of the other portions, so that the image can be easily recognized by direct viewing from the direction X1.

Next, specific examples of the materials forming these layers will be described. First, as the image recording layer 25, for example, a liquid crystal material is used as a material that undergoes a phase transition due to a temperature change or a voltage application. As the liquid crystal material, n-type nematic liquid crystal, n-type nematic liquid crystal / cholesteric mixed liquid crystal, p-type smectic liquid crystal, n-type smectic liquid crystal, chiral nematic liquid crystal, polymer dispersed liquid crystal, dispersed fine particle rotating system, electrophoretic material, etc. are used. it can.

The n-type nematic liquid crystal includes MBBA (n-
(p-methoxybenzylidene) -p-butylaniline), PAA
(P-azoxyanisole), APAPA (anisylidene para-a)
minophenyl acetate).

The n-type nematic liquid crystal / cholesteric mixed liquid crystal includes MBBA / CN (cholesteryl nonanoate).
) Mixed system, MBBA / EBBA (n- (p-pentoxybenzyli
dene) -p-butylaniline) / CN system, COC (cholester
yl oleyl carbonate) / MBBA mixed liquid crystal, COC /
EBBA (p-ethoxybenzylidene-p'-n-butylaniline)
Mixed liquid crystal, COC / PEBAB (p-ethoxybenzylidene-
p'-aminobenzonitorile) mixed liquid crystal, COC / MBBA
/ EBBA / PEBAB.

The p-type smectic liquid crystal includes CBOA
(N- (p-cyanobenzylidene) -pn- (octylaniline)), C
BOOA, AZ56, COB (cyano-octyl 4-4'biphen
yl), COOB, OCBP (octyl cyanobiohenyl),
There are PCBN, PCBD, Eutetic1, Eutetic2, and the like.

The n-type smectic liquid crystal includes PBBA
(P-butoxybenzylidene-pn-butylaniline), PBPA
(P-pentoxybenzylidene-pn-butylaniline), PBB
A (p-butoxybenzylidene-pn-hexylaniline), HBB
A (p-hexoxybenzylidene-pn-butylaniline), N,
N-dimethyl-Noctadecyl-3-aminopropyltrimethoxysil
yl and others.

The liquid crystal becomes a cholesteric phase as one of the bistable states. At this time, it is preferable to prevent the wavelength in the visible light range from being diffracted and colored by the diffraction grating formed by the cholesteric phase.

The polymer dispersed liquid crystal is composed of a polymer material and a liquid crystal material. Polymer materials include polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinyl acetate / vinyl alcohol copolymer, vinyl chloride / acrylate copolymer, polyvinylidene chloride, vinylidene chloride / vinyl chloride copolymer Coalescence, vinylidene chloride-acrylonitrile copolymer, polyester, polyamide, polyacrylate, polymethacrylate, acrylate-methacrylate copolymer, silicone resin and the like are used. Also,
Hydroxy pivalic acid ester neo
pentylglycole, 2-hydoxy-2methyl-1phenylpropan-1-on
A UV crosslinking material such as e, or a UV curable resin may be mixed and used. Note that a ceramic cell may be used instead of the polymer material. As a ceramic cell / liquid crystal composite type display member, there is one described in JP-A-9-127492.

The following materials are used as the chiral nematic liquid crystal.

[0031]

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[0032]

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As the liquid crystal material of the polymer dispersed liquid crystal, MB
BA, PAA, APAPA, PBBA, PBPA, HB
BA and others. The following material systems are also used.

[0034]

Embedded image

[0035]

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The fine particle dispersion system is composed of a polymer material, a transparent and low-viscosity low-molecular organic solvent, and fine particles unnecessary for the organic solvent. Polymer materials include polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinyl acetate
Vinyl alcohol copolymer, vinyl chloride / acrylate copolymer, polyvinylidene chloride, vinylidene chloride / vinyl chloride copolymer, vinylidene chloride / acrylonitrile copolymer, polyester, polyamide, polyacrylate, polymethacrylate, acrylate / methacrylate copolymer Coalescence, silicone resin and the like are used.

In addition, hydroxy piva is added to these polymer materials.
lic acid ester neopentylglycole, 2-hydoxy-2methyl-
UV crosslinking material such as 1phenylpropan-1-one or UV
You may mix and use a hardening resin. Small cells of an organic solvent such as acetone, toluene, ethanol and the like, which are transparent and have low molecular weight and do not swell, dissolve or decompose the polymer, are formed in the cells formed by these polymer materials. Needles in this cell,
Alternatively, fine particles are dispersed. The material used for the fine particles is a material that is stable to a solvent, and a metal (copper, aluminum, iron, cobalt, or the like), a semiconductor (silicon, germanium, or the like), an insulator (alumina, silicon oxide, or the like) is used. At this time, these fine particles must maintain a shape that causes white scattering.

Examples of the inorganic compound include silicon dioxide, magnesium fluoride, chromium oxide, nickel, and aluminum. It is better if the optical characteristics of the material system with respect to the electric field have hysteresis. In this case, the recording information can be held at a lower voltage than the driving voltage at the time of writing the image information, resulting in low power consumption. If the material is electroless and has a bistable state, no electric field is required for recording information, and recording can be held without consuming energy.

In order to keep the thickness of the image recording layer 25 uniform, it is necessary to introduce a spacer (not shown). The spacers include glass or resin beads. Alternatively, after depositing a thin film, pattern etching may be performed to produce a spacer.

Next, the materials used for the transparent electrode layer 26 include SnO _x and ITO (InSn) as inorganic materials.
_y O _x ), InO _{x and the} like, and on the other hand, polyaniline and the like as organic materials. The transparent electrode has a high transmittance in the visible light region, a resistivity that does not cause a delay that would hinder the voltage pulse applied to the liquid crystal, and a material that does not cause a chemical reaction with the liquid crystal material. It is necessary to be.

The material used for the electrode layer 22 needs to be transparent to the writing light. When the writing light is visible light or infrared light, it is necessary to use the same material as the transparent electrode layer 26.

The rear support 21 needs at least the following characteristics. First, the electrode layer 22, the optical address layer 23,
It is necessary to have a strength capable of supporting the dielectric layer 24, the image recording layer 25, the transparent electrode layer 26, and the front support 27, and a strength enough to withstand a force generated in writing or erasing an image and a shock during transportation. is there. Also, the rear support 21 is
It is necessary to design the material and thickness so that visible light can be transmitted at a sufficient ratio. In order to enhance the impact resistance, a flexible plastic film is used. On the other hand, when strength is required, a rigid plastic sheet or glass is used. In order to enhance the transmission of both visible light, the layer having an anti-reflection effect, if necessary, or adjusted to a film thickness capable of exhibiting the anti-reflection effect, or the anti-reflection effect can be enhanced by combining the two. Good.

On the other hand, the front support 27 is
Has a sufficient strength, the thickness of the image recording layer 25 is kept uniform, and the electrode layer 22, the optical address layer 23, the dielectric layer 24, the image recording layer 25, It is sufficient that the electrode layer 26 has such a strength that the electrode layer 26 is not broken. In some cases, in order to increase the transmittance of the writing light 14, the layer having an anti-reflection effect or a film thickness capable of exhibiting the anti-reflection effect may be adjusted, or the anti-reflection effect may be enhanced by combining the two. .

As the dielectric layer 24, various materials that absorb visible light can be used. Examples of black glass include IR-76, IR-80, IR-85, and RM-8 manufactured by Hoya Corporation.
6, RM-90 and RM-100. On the other hand, dyes include anthraquinone dyes and quinophthalone dyes. When one dye cannot absorb the entire wavelength range of visible light, there is a method using a mixture of two or more dyes. In addition, Bi (bismuth) -Si
Black materials such as O _x and carbon black resin can be used.

In the case of using a dye as the dielectric layer 24, a laminating method is as follows. A polymer in which the dye is uniformly dispersed is dissolved in a solvent, coated and dipped on the optical addressing layer 23, and then dried to form a layer. There is a way to do that. In order for the dielectric layer 24 to absorb visible light,
It is necessary to have a sufficient film thickness. Alternatively, it can be formed by laminating low molecular materials by a method such as vapor deposition. In this case, the material used for the dielectric layer 24 must not dissolve into the image recording layer 25 or cause a chemical reaction with the material used for the image recording layer 25.

Next, returning to FIG. 2, a specific example of an image information recording method by the image display device 10 using the image display plate 20 having the above configuration will be described. Writing light 1
The image recording using No. 4 is performed by irradiating the entire surface or scanning irradiation with the image signal, character information, code signal, line drawing signal information, etc., with the writing light intensity or pulse ON / OFF. For recording an image, a writing light 14 having a high light intensity is used. As a light source of the writing light 14, an argon laser (wavelength 514.488n) is used.
m), helium laser (wavelength 633 nm), semiconductor laser (wavelength 780.810 nm, 1310 nm, 1340)
nm, 1480 nm, 1550 nm, etc.), a YAG laser (wavelength 1064 nm), or the like can be used. There is also a method of irradiating a non-coherent light such as a light emitting diode or a halogen lamp by condensing it with a lens system.

The recording of an analog image is performed by writing light 1
The recording of digital images such as characters, codes, and line drawings is performed by controlling the writing light 14 on and off. It is also possible to convert the image information into halftone information and record it.

The scanning irradiation method of the writing light 14 is as follows.
By operating the polygon mirror 12 and the deflector 13 while condensing and irradiating the image recording layer 25 shown in FIG. 1 in the form of a spot, the writing light 14 is scanned to record an image.

Each portion of the image display panel 20 is irradiated with the writing light 14 for a short time by the scanning of the writing light 14. At this time, it is necessary to apply a DC voltage between the electrode layer 22 and the transparent electrode layer 26. Thereby, the optical address layer 23
Generates optical carriers and reduces the resistance value of the optical address layer,
As a result, local voltage distribution occurs. Therefore, the voltage applied to the image recording layer 25 increases, causing a phase transition or a change in the alignment state. Even after the irradiation of the writing light 14 is completed, the voltage distribution is maintained, so that the irradiated portion of the image recording layer 25 has an optical state different from the initial state. That is, there are two cases: a case where the transmittance in the initial state is high and the scattering state is generated by the irradiation of the writing light 14, and a case where the initial state is a scattering state and the transparent state is formed by the irradiation of the writing light 14.

The image display panel 20 on which an image has been recorded in this manner is placed under illumination light or sunlight in the direction X in FIG.
From the viewpoint of 1, the scattered portion of the image recording layer 25 looks white, and the transparent portion looks black because it is absorbed by the rear dielectric layer 24. Thus, a black and white image can be displayed.

The size of a pixel forming an image depends on the irradiation time of the writing light 14, the writing light intensity, the intensity distribution of the writing light spot, the carrier generation rate of the optical address layer 23, and the writing light 14 Greatly depends on the amount of loss due to reflection or absorption until the light reaches. By considering these physical quantities, a resolution of 300 dpi or more can be realized. The gradation is determined by the total energy to be irradiated, and is expressed by one or both of the area ratio between the scattering state and the transmission state and the transmittance in the scattering state.

The image recorded on the image recording layer 25 can be erased by applying a voltage between the electrode layer 22 and the transparent electrode layer 26. The applied voltage pattern includes DC voltage,
There are a sine wave, a triangular wave, a pulse wave, and a composite wave thereof. In addition, the cycle and pulse width of the voltage change
It depends on the type of liquid crystal material, and an appropriate one is selected by experiments and the like.

Next, a second embodiment of the present invention will be described. FIG. 3 is a sectional view showing a specific configuration of the image display panel according to the second embodiment of the present invention. Here, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The image display panel 30 of the present embodiment has a configuration in which a writing light shielding layer 28 having a function of shielding the writing light 14 is provided between the dielectric layer 24 and the image recording layer 25. In this case, the writing light shielding layer 28 may absorb or transmit the light transmitted through the image recording layer 25 from the X2 direction without reflecting it.

By doing so, the dielectric layer 24 becomes Y
Even without having a function of absorbing the writing light 14 from two directions, the writing light 14 can be shielded by the writing light shielding layer 28, while a good image can be seen.

Next, a third embodiment of the present invention will be described. FIG. 4 is a sectional view showing a specific configuration of the image display panel according to the third embodiment of the present invention. Here, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the image display panel 40 of the present embodiment, the writing light shielding layer 28 having a function of blocking the writing light 14 is provided in front of the front support 27.

In this case, the writing light shielding layer 28 and the writing light 14 are further restricted. That is, the writing light shielding layer 28 reflects a part of the visible light from the X3 direction,
Alternatively, in the case of transmission, the image recording layer 25 does not become paper white but is colored. Therefore, it is necessary that the writing light shielding layer 28 be configured to transmit all wavelengths in the visible light range. For this reason, it is necessary to use light outside the visible light range as the writing light 14 from the Y3 direction. Further, the writing light shielding layer 28 is provided with the writing light 1.
It is necessary to provide a function of reflecting or absorbing the light, or a function of both. For example, when using infrared light as the writing light 14, the material of the writing light shielding layer 28 needs to be capable of absorbing infrared light and transmitting visible light. Materials satisfying this condition include glass materials such as HA-20, HA-30, and HA-50 manufactured by Hoya Corporation. On the other hand, as a plastic material, a plastic film containing UCF manufactured by Kurehallentech Co., or an anthraquinone derivative, a phthalocyanine derivative, a naphthalocyanine-based compound, a cobalt complex, a dithiol-based metal complex, a squarium compound, an immonium-based compound, an acetylene derivative, etc. is there.

The image display boards 30 and 40 of the second and third embodiments are similar to the image display board 20 of the first embodiment,
By using the image display device 10 of FIG. 2, a high-resolution image display can be performed.

The deflector 13 shown in FIG.
Polygon mirror, galvanometer mirror, or acousto-optic (A
O) The effect can also be used. Alternatively, the writing light 14 can be relatively scanned by sliding the image display plate 20 side by a slide mechanism (not shown). It is also possible to combine both a deflector and a slide mechanism. Further, a mechanism for arbitrarily sliding the light output device 11 as a writing light source in a two-dimensional direction may be provided. FIG.
A movable mirror 51 may be provided instead of the deflector 13 and the writing light 14 may be scanned by sliding the mirror 51 as in the image display device 50 shown in FIG. In FIG. 5, the same reference numerals are given to elements having the same functions as those in FIG.

[0059]

Next, an embodiment of a method of manufacturing the image display plate 20 of FIG. 1 among the above-described image display plates will be described.

First, as the material of the rear support 21, 40
A blue plate glass of mm square was used. An electrode layer 22 made of ITO having a thickness of 180 nm was formed on the surface by sputtering. Next, an optical address layer 23 of an amorphous silicon film was formed on the surface of the electrode layer 22 by a plasma CVD method using silane as a raw material. Then, to form a dielectric layer 24 made of Bi (bismuth) -SiO _X by sputtering thereon.

Next, as a material of the front support 27 of the image display plate 20, a 40 mm square infrared transmitting glass HA-20 made by Hoya was used. On this surface, a transparent electrode layer 26 made of ITO having a thickness of 180 nm was formed by a sputtering method. After applying glass beads having a diameter of 18 mm to the surface of the transparent electrode layer 26 to form a spacer, a 10-hour curing type epoxy resin is applied to the periphery of the transparent electrode layer 26,
It adhered to the dielectric layer 24. At this time, a position where no epoxy resin was present at about 10 mm was formed at two positions facing each other when viewed vertically from the front support 27 side, and this was used as a liquid crystal injection port. When the epoxy resin was cured, a sufficient pressure was applied to each of the supports 21 and 27 so that the distance between the image recording layers 25 became uniform.

Furthermore, 50 Wt% of the chemical formula 1, 50 Wt
% Of the mixed liquid crystal of Chemical Formula 2 was injected from the injection port while heating so as not to generate air bubbles. After the pouring, the pouring port was sealed by leaving it with a high-speed curing type epoxy resin for 5 minutes. This was heated on a hot plate heated to 70 ° C. and allowed to cool to room temperature to complete the image display panel 20.

Next, the completed image display plate 20 was set at the position of the image display plate 20 of the image display device 10 in FIG.
Here, the optical output device 11 has a laser diode FLD148G3NL-C manufactured by Fujitsu (wavelength 1480 nm, output 1).
00mW). Then, the writing light 14 output from the light output device 11 is deflected rightward in the drawing by the polygon mirror 12, deflected in the direction perpendicular to the page by the deflector 13, and substantially perpendicular to the surface of the rear support 21 of the image display panel 20. Was made incident. At this time, a DC voltage of 60 V was applied to the device.

The incident writing light 14 was absorbed by the optical addressing layer 23, whereby the image recording layer 25 changed its phase and became cloudy. Thus, a monochrome image having a high resolution of 300 dpi was formed. The image was retained even when the voltage was reduced to 30V. After the formation of the image, the image was erased by applying a voltage of 50 Hz and 70 V for 1 second, and the image was restored.

As described above, it is possible to realize a high-resolution, high-contrast, rewritable reflective display having a memory function of image information. Further, the image display panel 40 formed in the same manner as the image display panel 20 is replaced with the image display apparatus 50 shown in FIG. It was installed in. Again, the optical output device 11 has a laser diode FLD148G3NL-C manufactured by Fujitsu.
(Wavelength 1480 nm, output 100 mW). Then, the writing light 14 output from the light output device 11 is
The light was deflected by the polygon mirror 12 in the direction of the image display panel 40, reflected by the mirror 51, deflected in the vertical direction, and irradiated onto the image display panel 40. At this time, the mirror 51 was moved at a constant speed, and the speed was set so that the polygon mirror 12 shifted by one pixel in the vertical direction when drawing the next line.

The writing light 14 was made to enter the surface of the image display panel 40 almost perpendicularly, and the light output device 11 was emitted only when the image recording layer 25 was changed in phase. Writing light 14
Was absorbed by the optical addressing layer 23, whereby the image recording layer 25 was phase-transformed and became cloudy. Thus, 300 dpi
A monochrome image having a high resolution was formed. After the formation of the image, the image was erased by applying a voltage of 50 Hz and 70 V for 1 second, and the image was restored.

[0067]

As described above, according to the present invention, an optical addressing layer that generates photovoltaic energy by light irradiation, and a phase transition or a change in orientation state in accordance with a change in voltage distribution caused by photovoltaicity of the optical addressing layer. And the image recording layer on which image information is formed by maintaining the state after the phase transition. By causing a phase transition accompanied by a change in transmittance, a high-resolution display can be achieved.

Since the state after the phase transition is maintained, once written, the displayed contents can be maintained. Further, high-resolution display can be performed without using fine electrodes. Therefore, the manufacturing is simplified and the cost can be reduced.

Further, since the visible light transmitted through the image recording layer can be absorbed by the dielectric layer on the back surface of the image recording layer, it can be directly viewed from the front side of the liquid crystal display panel. Can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a specific configuration of an image display panel according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a schematic configuration of an image display device according to a first embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a specific configuration of an image display panel according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a specific configuration of an image display panel according to a third embodiment of the present invention.

FIG. 5 is a diagram illustrating another configuration example of the image display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Image display apparatus 11 Optical output device 12 Polygon mirror 13 Polarizer 14 Writing light 20 Image display board 21 Back support 22 Electrode layer 23 Optical address layer 24 Dielectric layer 25 Image recording layer 26 Transparent electrode layer 27 Front support 28 Writing Light shielding layer

Claims (8)

[Claims] 1. An image display panel having a function of maintaining a display state of image information, comprising: an optical address layer that generates photovoltaic power for a specific wavelength; and a change in voltage distribution caused by photovoltaic power of the optical address layer. An image recording layer in which the image information is formed by generating a phase transition or a change in the orientation state in response to the phase transition or maintaining the state in which the orientation state has changed after the phase transition, and the image recording layer and the optical address layer And a dielectric layer formed between the layers and absorbing visible light transmitted through the image recording layer. 2. The image display panel according to claim 1, wherein the image recording layer is made of a liquid crystal material. 3. The image display panel according to claim 1, wherein an electrode layer in contact with said image recording layer is made of a transparent electrode material. 4. The image according to claim 1, further comprising a support for supporting the image recording layer, wherein the visible light absorbing layer is laminated on the side of the support opposite to the visible light. Display board. 5. The image display panel according to claim 1, wherein the dielectric layer is made of a material having an insulating property and absorbing visible light. 6. An image display device for displaying image information, comprising: an optical address layer in which photo carriers are generated by irradiation of writing light; and a change in voltage distribution caused by the change in voltage distribution in the image recording layer. An image recording layer on which the image information is formed by causing the accompanying phase transition or change in the orientation state, and maintaining the state after the phase transition or the orientation state changes, and between the image recording layer and the optical address layer. An image display panel having a dielectric layer that absorbs visible light transmitted through the image recording layer; and a substance that is contained in the image recording layer is sufficiently phase-changed or changes in alignment state. An image display device comprising: an image recording unit that records an image to be displayed by locally generating an optical carrier. 7. The image recording means includes: a writing light source;
7. The image display device according to claim 6, further comprising: light guide means for guiding writing light output from the writing light source to a predetermined position on the image display plate. 8. The image display according to claim 6, further comprising resetting means for returning the state before the phase transition by applying a voltage to the image recording layer and erasing the recorded image. apparatus.