JPH11143397A - Display device and its display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable watching easily information even in a dark place by providing a means for charging a photosensitive layer, a means for irradiating a photosensitive layer with light, and a means irradiating a surface potential sensitive fluorescent dystuff with dystuff exciting wavelength light. SOLUTION: After a whole surface of a photosensitive layer is charged, light with which the photosensitive layer is irradiated through an opening pattern 27 of a mask 28 is selected and non-selected, electric charges are discharged from an exposed part on the selected photosensitive layer, and a potential on the surface of dystuff 3 corresponding to an exposed photosensitive layer is made zero. And when a surface of charged colorant 3 is irradiated with colorant exciting wavelength light, lighting is obtained from the surface. Next, electric charges on a surface of dystuff 3 is canceled by applying bias voltage so that electric charges generated on a surface of dystuff 3 between a light transmitting and conductive substrate 1 and a light transmitting and conductive substrate 6. Also, an electrostatic latent image pattern on a photosensitive layer developed by exposure is erased by re-exposure of a whole photosensitive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device for performing display using a surface potential sensitive dye and a display method thereof.

[0002]

2. Description of the Related Art In recent years, with the development of information equipment, the amount of information data including character information such as numerals and alphabets has been steadily expanding, and information output has been made in various forms. As one form, print output on paper by a printer or the like is used. Although it is considered that the printing output on papers becomes eventually unnecessary due to the digitization of information, a huge amount of printing output is still actually performed. The reason for this is that, for example, information printed out on paper can be arranged in large numbers on a desk without a display area being limited by the size of a screen like a CRT display. Can be viewed and rearranged, and curved surfaces can be displayed depending on the material of a medium to be printed such as paper. In addition, the above-mentioned print output does not require power or the like for holding a display, and has a portability that information can be checked anytime and anywhere as long as the amount of information is not extremely large.

[0003]

However, since the printed output on paper is not a self-luminous display, it is difficult to visually recognize information printed in a place without a light source such as a dark room or in a light amount. Depending on the method of writing information, such as a hard pencil or a hard pencil, information cannot be erased or traces of erased information remain, so it is necessary to forcibly erase the information using a special method such as chemical treatment and then reuse it There were some issues.

Accordingly, the present invention is a self-luminous type which has characteristics of portability and no driving power required for display in a printout method on paper, and at the same time allows information to be easily visually recognized even in a dark place. It is an object of the present invention to provide a display device that can be rewritten.

[0005]

The feature of the present invention to solve the above-mentioned problem is that another substrate formed by applying at least one or more surface potential-sensitive fluorescent dyes on a transparent conductive flat substrate is provided. Is provided in parallel with, but not directly in contact with, the conductive flat substrate, and further, a photoreceptor layer is provided in parallel with, but not in direct contact with, the substrate coated with the dye.

In the above-mentioned display device, the photoconductor layer is made of zinc oxide or an organic photoconductor material.

[0007] Further, another substrate formed by applying at least one or more surface potential-sensitive fluorescent dyes on the transparent conductive flat substrate is provided in parallel with the conductive flat substrate without directly contacting the conductive flat substrate. A step of pre-charging the photoreceptor layer using a display device having the photoreceptor layer not in direct contact with and in parallel with the substrate coated with the dye, and exposing the photoreceptor layer through a mask Forming an electrostatic latent image on the photoreceptor layer with a pattern corresponding to the mask pattern; irradiating the dye with excitation wavelength light; detecting light emission from the dye; and The display method includes a step of erasing the charged pattern by re-exposing the entire surface.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 shows an example of a display device used in the present invention. In the figure, reference numeral 1 denotes a light-transmitting conductive substrate. For example, a film made of a polymer or the like can be used in addition to glass coated with a transparent or translucent electrode such as ITO and gold. Reference numeral 2 denotes a spacer having a thickness of 7.5 μm to 500
μm film can be cut and used.
Fine particles of silica or a polymer material having a diameter of about 2 μm to 200 μm may be used. Preferably 10 μm
The film or the fine particles having a thickness of １００100 μm can be used.

Reference numeral 3 denotes a dye, and any dye may be used as long as it emits light at the surface potential of the portion where the dye 3 is placed. The dye 3 is applied directly to the surface of the substrate 4 described later or after being dissolved in an appropriate solvent. For example, anilinonaphthalenesulfonic acids, toluidylnaphthalenesulfonic acids, N
-Methylanilinosulfonic acid and the like can be used. Alternatively, two or more of these dyes may be used.

The type of the substrate 4 is not particularly limited as long as it is an insulating and transparent or translucent material to which the dye 3 can be applied by an appropriate method. For example, in addition to a hard material such as glass and quartz, a flexible material such as a non-conductive polymer film can be used. The substrate 4 is disposed so as not to be in direct contact with the transparent conductive substrate 1 via the spacer 2 and to be in parallel with the transparent conductive substrate 1.

Next, a spacer 5 is provided on the substrate 4 in the same manner as described above.

The substrate 6 has a photoreceptor layer coated thereon. The substrate 6 has conductivity and is light-transmitting. For example, aluminum, chromium, nickel,
A film made of a conductive material such as stainless steel, copper, zinc, indium oxide or the like can be applied and molded together with a suitable binder resin to form a film. Further, for example, a conductive polymer such as polypyrrole, polyphenylene, or polythiophene can be formed into a film by electrolytic polymerization or the like and used. However, the thickness of the substrate 6 is preferably thin so that the light transmittance of the substrate 6 does not decrease.

Examples of the material for the photoreceptor layer include inorganic charge transporting substances such as selenium, selenium-tellurium, amorphous silicon and cadmium sulfide, and organic charge transporting substances such as 2,4,7-trinitrogen. Electron-withdrawing substances such as fluorenone, 2,4,5,7-tetranitrofluorenone, chloranil and tetracyanoquinodimethane, compounds obtained by polymerizing these electron-withdrawing substances, and polycyclic aromatic compounds such as pyrene and anthracene Carbazole, indole, imidazole,
Oxazole, thiazole, oxadiazole,
Heterocyclic compounds such as pyrazole, pyrazoline, thiadiazole and triazole compounds; hydrazone compounds such as p-diethylaminobenzaldehyde-N, N-diphenylhydrazone and N, N-diphenylhydrazino-3-methylidene-9-ethylcarbazole Compounds; styryl compounds such as α-phenyl-4′-N, N-diphenylaminostilbene and 5- [4- (di-p-tolylamino) benzylidene] -5H-dibenzo [a, d] cycloheptene; benzidine compounds Triarylmethane compounds; holes such as triphenylamine compounds or polymer compounds having a group derived from these compounds in the main chain or side chain (eg, poly-N-vinylcarbazole, polyvinylanthracene, etc.); Transportable substances It is. These film thicknesses are from 0.1 μm
5 μm is preferred. As another form, azulene dye / squarium dye /
Cyanine dyes, azo pigments such as Sudan Red and Diane Blue, quinone pigments such as pyrenequinone, perylene pigments, indigo pigments, phthalocyanine pigments (film thickness 5 μm
To 50 μm) may be formed by combining or mixing in a layered form, and further mixing a resin binder if necessary.

The photoreceptor layer is desirably transparent or translucent. In any case, transparency can be ensured by controlling the film thickness.

Further, in order to protect the photoreceptor layer from external mechanical and chemical adverse effects, a resin layer, a resin layer containing conductive particles and a charge transport material, or the like can be provided as a protective layer. .

The substrate 6 on which the photoreceptor layer has been formed is placed on the substrate 4 coated with the dye via the spacer 5.
The surface of the photoreceptor layer is placed so as to face the substrate 4 coated with the dye so as not to be directly in contact with the upper side and to be parallel.

As described above, according to the present invention, display is performed using the apparatus having the above configuration. The following example is shown in FIG.
It is described using. FIG. 2 shows a mask 28 in the component of FIG.
It is a device to which is added. In addition, the components shown in FIG.
The same components as those in FIG. First, as described in Japanese Patent Application Laid-Open No. 05-6076, the substrate 6 on which a photosensitive layer is formed on the back surface of the device is pressed by a spring while rotating a charging roller (not shown) or the like. 6 while being in contact therewith and charged. Alternatively, a wire electrode (not shown) facing the substrate 6 and a shield electrode (not shown) surrounding the wire electrode are provided, and a voltage is applied to the wire electrode to perform corona discharge, thereby pre-charging the substrate 6.

Next, character information and the like are formed on a mask 28 as an opening pattern 27. A mask 28 having an opening pattern 27 formed thereon is set on the substrate 6.

Then, the photosensitive layer is exposed to light through the mask 28 to form an electrostatic latent image 29 corresponding to the opening pattern 27 of the mask 28 on the photosensitive layer formed on the substrate 6. Due to the formation of the electrostatic latent image 29, a surface potential is generated on a portion of a pattern corresponding to the electrostatic latent image on the substrate 4 on which the dye 3 is applied. Since the dye 3 is sensitive to surface potential, subsequently, light including the excitation wavelength of the dye is irradiated from the substrate 1 side, whereby light emission corresponding to the electrostatic latent image 29 is obtained. This emission image becomes clearer by using an optical filter that does not transmit the dye excitation wavelength.

Further, an example of the principle of the display method of the present invention will be described in detail below with reference to FIG.

After charging the entire surface of the photoreceptor layer, the mask 28
The light irradiated on the photoreceptor layer 26 is selected and deselected by the opening pattern 27, and the portion where the light is exposed on the photoreceptor layer is depleted of the charge on the photoreceptor layer, and the light is exposed. There is no potential on the surface of the dye 3 corresponding to the photosensitive layer portion. In addition, the portion of the unselected photoreceptor layer that is not exposed to light retains the charged charge on the photoreceptor layer, and also retains the potential on the surface of the dye 3 corresponding to the photoreceptor layer that is not exposed to light. .

When the surface of the dye 3 where the potential is generated is irradiated with the dye excitation wavelength light, light is emitted from the surface. Further, even if the surface of the dye 3 where no potential is generated is irradiated with the dye excitation wavelength light, almost no light emission is obtained from the surface portion.

The reason for using an optical filter is that the excitation light for the dye 3 is blocked or only the light emitted from the dye 3 is selectively passed, so that an observer can easily see the emission image. It is.

Next, a bias voltage is applied between the light-transmitting conductive substrate 1 and the light-transmitting conductive substrate 6 in a direction of erasing the charges generated on the surface of the dye 3, and the Cancel the charge. Further, the electrostatic latent image pattern on the photoconductor layer formed by exposure to light is erased by re-exposing the entire surface of the photoconductor layer.

In the present invention, instead of forming the character information or the like as the opening pattern 27 on the mask 28,
Paper or the like on which various information such as character information (numerals, alphabets, etc.) are directly printed may be used as the mask 28. In this case, the portion where the character information or the like is printed transmits light, and in the display device of FIG. 2, the dye 3 corresponding to this portion does not emit the dye excitation wavelength light, and the character information or the like is printed. The dye 3 corresponding to a portion other than the above portion emits a dye excitation wavelength light.

According to the structure of the present invention, since the display is a self-luminous display, it can be used in a place without a light source such as a dark room or in a dark room.
This has the effect that various information such as character information (numbers, alphabets, etc.) can be visually recognized.

Also, unlike the print output, the display can be rewritten.

In other words, the display device of the present invention does not require energy for holding the display (memory property), is excellent in portability, and is rewritable. It also has the effect of having the characteristics of a light emitting display.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown below, a display device and a display method of the present invention will be described in detail with reference to examples.

(First Embodiment) A manufacturing process of a display device and a display method of the display device in this embodiment will be described with reference to FIGS. Washed and dried glass substrate 31
(15 mm square) by sputtering while patterning a lead-out portion for applying an ITO voltage to 500 °.
(FIG. 3A). Next, the substrate 31
A Kapton film (thickness: 15 μm) was placed around the perimeter to form a spacer 32 ((b) in FIG. 3). Next, 8-anilino-1-naphthalenesulfonic acid (Aldrich) dissolved in ethanol at a concentration of 10 wt% as a dye 33 was applied to a washed glass substrate 34 having a thickness of 0.2 mm by a spin coating method and dried. It was fixed on a substrate 31 via a spacer 32 (FIG. 3C). A spacer 35 was provided again on the glass substrate 34 on which the dye 33 was applied, as shown in FIG. Next, a glass substrate 36 to be covered with the photoreceptor layer was prepared as follows. Polypyrrole film made by electrolytic polymerization, area 1cm2, thickness 5
It was cut into strips of 0 μm. Four of them are stacked and 200
A substrate 36 μm was used.

Next, tetracyanoquinodimethane (10% by weight), 2,5-bis (p-diethylaminophenyl) -1,3,4-oxadiazole (40% by weight) and polyisobutyl methacrylate (50% by weight) was dissolved in ether, and a solution having a thickness of 10 μm after drying was applied to the substrate 36 made of a polypyrrole film.
The bar was coated so that Next, the substrate 36 was placed via the spacer 35 in which the above-mentioned photoreceptor layer faces the dye side (FIGS. 3D and 3E), and a display device was manufactured. Here, FIG. 3D is a plan view of the display device, and FIG. 2E is a cross-sectional view of the display device.

Next, the substrate 36 is contact-charged by the method described above, and a mask 37 as shown in FIG.
The light 38 from the halogen lamp was exposed while being placed on the top (FIG. 4A). Subsequently, the display device of this embodiment is
Irradiate from the substrate 31 side with light 39 containing a wavelength of 0 nm, 42
An optical filter 310 (available from Nippon Vacuum Optical Co., Ltd., which cuts the shorter wavelength side than the wavelength of 0 nm, having an average transmittance of 9 in the light transmitting portion)
0%) (FIG. 4 (b)).
A display corresponding to the pattern of the mask 37 could be observed (in FIG. 5, reference numeral 51 denotes a light-emitting portion, and 52 denotes a non-light-emitting portion). Further, this display could be observed again even after a time interval of several hours, for example.

Next, a voltage of 100 V was applied between the substrate 31 and the substrate 36 on which the photoreceptor layer was formed in a direction to uniformly cancel the charge on the glass substrate 34, and the same observation as in FIG. As a result, light emission corresponding to the pattern of the mask 37 could not be observed.

Next, the display element of this embodiment was contact-charged again as described above, and thereafter the same operation as above was performed. As a result, the same result as above was again obtained.

(Second Embodiment) In this embodiment, instead of the polypyrrole film of the first embodiment, a substrate coated with a photoreceptor layer was produced using a polyphenylene film produced by electrolytic polymerization. Hereinafter, a display element was manufactured in the same manner as in the steps of the first embodiment, and a display operation was performed in the same manner as in the first embodiment. As a result, a result similar to that of the first example could be obtained.

(Third Embodiment) In this embodiment, instead of the polypyrrole film of the first embodiment, a substrate coated with a photoreceptor layer was produced using a polythiophene film produced by electrolytic polymerization. Hereinafter, a display element was manufactured in the same manner as in the steps of the first embodiment, and a display operation was performed in the same manner as in the first embodiment. As a result, a result similar to that of the first example could be obtained.

(Fourth Embodiment) In this embodiment, a display element manufactured by the same method as the process of the first embodiment is used.
The display operation was performed in the same manner as in the first embodiment, except that the charging method was performed by the corona charging described above instead of the contact charging in the first embodiment. As a result, a result similar to that of the first example could be obtained.

(Fifth Embodiment) FIG. 7 is a sectional view of a display device of the present embodiment. In the present embodiment, basically the same processes and evaluations as in the first embodiment were performed, but instead of the substrate 31 (see FIG. 3) in the first embodiment, a PET film 61 with an ITO film (100 μm in thickness) was used. Was washed and dried, and polymer fine particles (7.5 μm in diameter) were dispersed on one surface of the film to form a spacer 62. Next, in place of the glass substrate 34 (see FIG. 3) in the first embodiment, the thickness
8-anilino-1-naphthalenesulfonic acid (Aldrich) dissolved in ethanol at 10 wt% as a dye 63 on a 00 μm PET film 64 was applied and dried according to the prescription described in the first example, and was again the same as the spacer 62. The display device was manufactured by dispersing and fixing the spacer 65 made of the above material.

Next, the film 66 having the photoreceptor layer formed thereon was charged and charged in the same manner as in the manufacturing method described in the first embodiment.
Exposure. Subsequently, when the display was performed by the same method as the manufacturing method described in the first example, the same result as in the first example could be obtained.

Next, a voltage of 100 V is applied between the film 61 and the film 66 on which the photoreceptor layer is formed in a direction for uniformly canceling the charge on the film 64, and the same as in FIG. As a result of observation, no luminescence could be observed as in Example 1.

Next, the display element of this embodiment was contact-charged again as described above, and thereafter the same operation as above was performed. As a result, the same result as above could be obtained again.

Next, one end of the display element of the present embodiment was bent so as to be raised by about 30 ° from the horizontal, returned to a horizontal position, and the display operation was performed again. As a result, the same result as above was obtained. Was completed.

(Sixth Embodiment) In this embodiment, the dye 63 in the third embodiment is replaced with 2- (p-toluidinyl) naphthalene-6-sulfonic acid, and accordingly, the display device of this embodiment is irradiated with light. Was irradiated with light having a wavelength of 320 nm, and an image was observed through an optical filter for display observation that was changed to a filter that cuts a shorter wavelength side than the wavelength of 380 nm. As a result, a result similar to that of the third embodiment was obtained.

[0044]

As described above, since the printed output on paper is not a self-luminous display, it is difficult to visually recognize information printed in a place without a light source such as a dark room or in a light amount. Depending on the method of writing information, such as a pencil, information cannot be erased or traces of erased information remain, so it is necessary to forcibly erase the information using a special method such as chemical treatment and then reuse it. was there.

As described above, the present invention makes it possible to manufacture a rewritable self-luminous display device that does not require driving power for display. In addition, since it has bending resistance, it can be used in a wider range of conditions and environments. Furthermore, since it is not necessary to use paper as a recording medium, it can contribute to a reduction in environmental load.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a display device according to the present invention.

FIG. 2 is a diagram illustrating a display method using a display device according to the present invention.

FIG. 3 is a diagram illustrating an embodiment of the present invention.

FIG. 4 is a diagram illustrating an embodiment of the present invention.

FIG. 5 is a diagram illustrating a mask used in an embodiment of the present invention.

FIG. 6 is a diagram illustrating an image displayed according to the embodiment of the present invention.

FIG. 7 is a diagram illustrating a fifth embodiment of the present invention.

[Explanation of symbols]

 1, 31 light-transmitting conductive substrate 2, 32, 62 spacer 3, 33, 63 surface potential-sensitive fluorescent dye 4, 34 light-transmitting conductive substrate 5, 35, 65 spacer 6, 36 photoreceptor layer formed Transparent substrate 27 Opening 29 Electrostatic latent image 28, 37 Mask 38 White light 39 Dye excitation light 310 Optical filter 51 Light emitting section 52 Non-light emitting section 61, 64, 66 Film

Claims (3)

[Claims] A first light-transmitting conductive substrate; and a first light-transmitting conductive substrate.
A transparent substrate having at least one or more kinds of surface potential sensitive fluorescent dyes on its surface in parallel with a distance above the light-transmitting conductive substrate, and having a distance in parallel above the transparent substrate. A second light-transmissive conductive substrate having a photoreceptor layer on the surface facing the surface potential-sensitive fluorescent dye, means for charging the photosensitive layer, and passing light through the photosensitive layer through a mask. A display device comprising: means for irradiating; and means for irradiating the surface potential-sensitive fluorescent dye with light of a wavelength excited by a dye. 2. The display device according to claim 1, wherein the photoconductor layer is made of zinc oxide or an organic photoconductor material. 3. A first light-transmissive conductive substrate;
A transparent substrate having at least one or more kinds of surface potential sensitive fluorescent dyes on its surface in parallel with a distance above the light-transmitting conductive substrate, and having a distance in parallel above the transparent substrate. A second light-transmissive conductive substrate having a photosensitive layer on the surface facing the surface potential-sensitive fluorescent dye, and charging the photosensitive layer. One step; irradiating the photoconductor layer with light through a mask to form an electrostatic latent image corresponding to the mask pattern on the photoconductor layer; and a second step corresponding to the electrostatic latent image pattern. A third step in which surface potential is generated on the surface of the surface potential-sensitive fluorescent dye, and irradiating the surface potential-sensitive fluorescent dye with dye excitation wavelength light;
Performing a fourth step of obtaining a light emission image corresponding to the surface potential pattern.