JPS6083066A - Picture display - Google Patents

Abstract

PURPOSE:To prevent occurrence of unevenness of picture quality due to external light by providing a shading layer on the surface of a photoconductive layer of an image carrier used in a picture display. CONSTITUTION:When light image exposing is started in an exposed position on the back of a belt 4, conductive toner of developing sleeve side adheres selectively on the surface side of the belt, and a toner image corresponding to the exposed image is formed. The surface of the belt on which the toner image is formed turns within the limit of a picture peeping window 2 and stops once. Thus, the picture is displayed in the window 2. After the lapse of a fixed time, or by operation of a belt restarting button, the belt 4 is rotated again, and the next display picture is moved to the window 2, and the belt is stopped temporarily and the picture is displayed. The image carrier is made by forming a transparent conductive layer 42 on the outer face of a transparent base sheet material 41 to make a transparent conductive base body layer 43. A photoconductive layer 45 is provided on the transparent conductive layer 42, an intermediate layer 48 that forms a shading layer is superposed on the photoconductive layer 45, and a surface layer 49 is superposed on the intermediate layer 48. The surface layer 49 functions as a layer that carries a toner picture.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables visual confirmation of electrical image information that is calculated or read out from an electronic computer or image reading device, and information that is stored as a soft copy on magnetic tape or microfilm. A dental display (tooth display) that is reproduced as an image or attached to an image forming device such as a copier or an office automation device as an image monitor.
(display) device.

More specifically, the present invention relates to an improvement of a dust supporter of a device that creates a toner image corresponding to the input of the various information signals described above on the surface of an appropriate image supporter as a display image and displays the image.

Conventionally, CR'1'' display devices, liquid crystal display devices, etc., have been widely used as image display devices, but these display devices do not necessarily have the same resolution (note 2) display screen size or visibility. I can't say it's enough.

For example, looking at the recent development of office automation equipment, the display screens required for monitors such as word processors, microfilm retrieval, and optical disk memory are high-definition stationary screens, while CRTs and liquid crystal displays flicker or are dependent on the viewing angle. It's too short to say it's appropriate due to gender.

The present invention proposes a method of repeatedly forming one toner image on a display screen as a device particularly suitable for displaying still images of high quality. Specifically, there is a method (Japanese Patent Application No. 56-197410) in which an image carrier having a photoconductor layer is used to form a toner layer simultaneously with exposure to an optical signal.

The image displayed by the method described above is a typical electronic photograph.

It is easy to understand that the image quality is higher than that of electrostatic printing and magnetic printing because it does not involve a transfer process. Furthermore, it can be said that it is particularly excellent in displaying still images, since it can provide an image quality comparable to that of printing, even compared to the CRT and liquid crystal of the general-purpose Nice Play device mentioned above.

On the other hand, an image display device in which a toner image is formed and displayed on a barrier carrier having a photoconductor layer, and an image carrier displaying an image receives light from the outside through a display window during display. The photoconductor is irradiated differently by the external light between the areas that hold the toner (the image) and the areas that do not, or the areas that are in the display position and the areas that are not in the display position. There will be different electrical states in the layers.This means that in subsequent imaging,
Differences in image quality such as station density and contrast may occur, significantly impairing image quality.

The present invention is intended to improve the change in image quality caused by external light on the one-image carrier used in the above-mentioned image display device. This change in image quality due to external light can be improved by comprehensive technology related to the photoconductor layer and the image forming process, but as a result of focusing on the structure of the image carrier and turning it horizontally, the surface side of the photoconductor layer We have discovered that changes in image quality caused by external light can be eliminated by using an iron carrier with a light-shielding layer.

Therefore, an object of the present invention is to provide a highly accurate and highly reliable image display device. Another object of the present invention is to provide a highly stable and highly durable one-image carrier that can be applied to a device that creates and displays toner images on a display surface.

The characteristics and effects of the one-image carrier of the present invention will be explained in detail below. As an example of an image display device using toner, FIG. 1 shows a method using a photoconductive layer as an image carrier.

FIG. 1 is a longitudinal sectional side view showing an extremely simplified structure of an example of the image display device of the above type. 1 is a vertical device exterior box; 2 is a display image viewing window formed with a large opening on the front surface of the exterior box; generally a transparent plate 3 such as a glass plate is attached thereto;

Reference numeral 4 denotes an endless belt-type photoreceptor (carrier, hereinafter simply referred to as belt) stretched between a driving pulley (or roller) 5 and a driven pulley (same) 6, which are installed horizontally in the upper and lower parts of the outer box. (abbreviated). For example, as shown in the second figure, the belt is made of a transparent and strong base sheet 41 such as a synthetic resin sheet or film, which is coated with metal or metal oxide (
A method in which a transparent conductive layer 42 is formed by thinly vapor-depositing indium oxide, tin oxide, chromium oxide) is used as a transparent conductive base layer 43, and an original conductive shell layer 44 is applied to the surface of the conductive layer 42. - It is formed by laminating layers using a vapor deposition method or the like, and the outer circumferential surface of the belt 4 is the photoconductor layer surface. The belt 4 is rotationally driven in the direction of the arrow by the rotation of the drive pulley 5, and the tension side outer surface of the belt 4 moves through the viewing window 2 of the display image 1 from the bottom to the top.

Reference numeral 10 denotes a light beam scanning type optical signal exposure device disposed in the space between the tight side belt portion and the loose side belt portion of the rotary belt, which includes a semiconductor laser (or cassette laser), a polygon mirror, and an f-theta mirror. Consists of a temple. Then, the time-series electrical digital pixel information S is inputted from a one-time reading device (not shown), such as an electronic D1 calculator, and a laser beam L as information light modulated in accordance with the signal is emitted in the direction of the driven pulley 6. oscillates to The oscillated beam is directed by the mirror 11 midway toward the back side portion A of the tension side belt near the driven pulley 6, passes through the entire slit 12a of the slit plate 12, and scans the back side portion A of the belt in the belt width direction. Expose. The scanning of the laser beam L in the belt width direction is used as a main scan, and the movement of the belt 4 is used as a sub-scan, so that the back surface of the belt 4 is sequentially exposed to light from a light source.

13 is a developing device disposed on the front side of the belt corresponding to the back side mA of the belt that receives the laser beam scanning exposure;
Reference numeral 14 denotes a lamp for irradiating the entire surface with light, which is disposed downstream of the exposure area A in the direction of belt movement on the back side of the tension side belt.

The illustrated example field unit device 13 includes a developer storage box 15 and the box 1.
A rotating sleeve 16 made of a non-magnetic material such as stainless steel or aluminum and having a left side half circumferential surface exposed to the outside inside the box, and a magnet row 217 inserted and built into the sleeve 16. The conductive magnetic toner "r" in the box 15, which consists of a developing agent applying blade 18 on the outer surface of the sleeve, and a developer (conductive magnetic toner) T stored in the box 15, is placed near the rotating developer sleeve 16. The toner in the sleeve is attracted by the magnetic field of the magnet roller 17 inside the sleeve, is held on the outer peripheral surface of the sleeve as a magnetic absorption layer, and rotates together with the sleeve, and the layer thickness is regulated by the blade 18 on the way to form a uniform layer. The toner layering surface contacts and passes through the belt surface portion corresponding to the exposed portion A of the belt sleeve surface light 1'A by rotation of the sleeve.

A DC bias is applied between the conductive layer 42 of the belt 4@11 and the developing sleeve 16, and E indicates the voltage.

When the belt 4 and the current unit device 13 are driven and the light-to-light exposure is started on the exposure section 1A on the back side of the belt 4, the belt will move according to the principle described later. The conductive toner currently in the sleeve 16 is selectively stuck to the Narita 1 side to form toner needles corresponding to one exposure image. The belt surface on which the toner image 1 has been formed is rotated to a position within the range of the picture iron viewing window 2 and is temporarily stopped. As a result, an image is displayed on the second window. After a predetermined period of time has elapsed, or by operating the belt re-rotation button, the belt 4 is rotated again and the next display image is moved to the window 2, and the belt is temporarily stopped and one image is displayed. By repeating this process, images are displayed in sequence.

After the image 1 image display is completed, the displayed toner image on the belt surface that has reached the image 1 image device 13 again by the subsequent rotation of the belt is removed from the belt surface by the active and cleaning action of the current threshold device, and the image 1 image is returned to the image 1 image. It is recovered to the equipment side. On the belt surface from which the toner image 1 image has been removed, toner image 1 stations corresponding to the light 1 image exposure pattern at the exposure area A are successively formed. Move to the second part of the display window.

The entire surface light irradiation lamp 14 passes through the light exposure area A and irradiates the back side of the belt, on which the toner image is formed, with light uniformly in the width direction, thereby exposing the light guide body 44 of the belt 4.
The toner image is formed on the surface of the belt, which is installed to make the internal electrical state uniform in each part, without charging, and is performed simultaneously with the first light exposure. The principle will be explained with reference to FIG. For convenience of explanation, it is assumed here that the photoconductor layer 44 of the belt 4 is of N type, and that a negative bias is applied to the conductive layer 42 and a positive bias is applied to the developing sleeve 16. At the light 1 quadrant exposed area A, the exposed bright area (A(L)
), FIG. 3) passes through the transparent base layer 43 and enters the photoconductor layer 44. Electron-hole pairs are generated in the portion of the photoconductor layer 44 that receives light, and the electrons e are attracted by the positive bias of the belt conductive layer member and the developing sleeve toward the surface of the photoconductor layer 440. Moving. Along with this, the toner on the current sleeve 16 side that comes into contact with and passes through the belt surface area corresponding to the light-exposed area A (L) on the belt m surface is opposed to the transferred electron e to the conductive toner in the surface layer. A positive electric charge is induced. The positive charge induced toner adheres (Ta) from the developing sleeve 16 side to the belt surface side due to the Coulomb force between the electron e and the positive charge induced toner.

The positive charge of the attached toner Ta is then neutralized with the electrons e on the surface of the photoconductor layer 44 and disappears within a short time.

On the other hand, in the exposed dark area (A (D), FIG. 4), the conductive layer portion is Although upper and negative charges are induced in the surface toner of the conductive toner layer, the Coulomb force acting between them is weak, so that almost no toner adheres to the surface of the belt 4.

Therefore, without charging the photoconductor layer 44 of the belt 4, the light guide 'corresponding to the light exposure area of the light-to-light exposure can be carried out simultaneously with the light image exposure.
Toner selectively adheres only to the surface of the electric layer (Ta)
Thus, one toner image is formed.

In addition, the toner image that has been rotated to the developing device 13 after being displayed is easily removed from the belt surface by being rubbed by the layer of toner held on the side of the image sleeve 16, and is easily removed from the surface of the belt. The toner particles are collected and used repeatedly to form one toner image.

As mentioned above, a system that displays one image by forming one image of toner on the surface of an image carrier using a photoconductor has a higher resolution than, for example, a CRT display device or a display device that uses liquid crystal. There is no flickering in a still image, and the angle dependence is small like that of a liquid crystal display, so it is easy to see the image and there is less line of sight. By adding a mechanism to transfer the produced toner particles onto the copy paper surface, it is possible to easily obtain the following advantages:
do. In particular, as in the above example, uncharged and simultaneous exposure toner image 1
An apparatus that uses the O-forming method and also functions as both a molding machine and a cleaning machine has an extremely simple device configuration and is highly practical.

In addition to the laser beam scanning method described above, the optical signal exposure device 1O may also include a slit exposure device for the document 11, an LED play device, liquid crystal, PLZT, various shutter arrays that selectively transmit white light, etc. Available. It may also be an exposure device that uses X-rays. In this case, the base layer 43 of the belt 4 does not need to be transparent to visible light, as long as it is transparent to X-rays.

The image supporter used in the image display device of the present invention can have the configuration shown in FIG. 5(8) to FIG.
A transparent conductive layer 42 is formed on the outer surface of the transparent conductive layer 42 to form a transparent conductive base layer 43, and a photoconductor layer 45 is formed on the surface of the transparent conductive layer 42. A surface layer 46 which is a light-shielding layer, an intermediate layer 47 formed on the photoconductor layer 45 in FIG. can be obtained by laminating an intermediate layer 48 serving as a light shielding layer on the photoconductor layer 45, and further laminating a surface layer 49 on the intermediate layer 48. This surface layer 46 or 49 functions as a layer that carries toner stamps. The photoconductor layer 45 is, for example, Cu, In-doped CdS, a dye-sensitized organic semiconductor, or a photoconductor layer 45 of Se, 5e-Te, or the like. The intermediate layer 47 in FIG. 5 1b+ is provided on the photoconductor layer, and is made of polyamide, polyvinyl alcohol, polyurethane, epoxy resin, casein methylcellulose, etc., for the purpose of improving the coating properties and adhesive properties of the surface layer 46. It can be formed from resins such as nitrocellulose, phenolic resin, ionomer resin, ethylene-acrylic acid copolymer, methacrylic acid ester-methacrylic acid copolymer, etc., and titanium oxide with a white thread color tone can be used to adjust the electrical resistance. It may also contain pigments or dyes such as zinc oxide and tin oxide.

When the intermediate layer 48 as shown in FIG. 5 1b+ is used as a light-shielding layer, this light-shielding layer is made of a light absorbing material having absorption in all or most of the wavelength range to which the photoconductor layer 45 is sensitive.
For example, all types of colloids such as black colloid bride, carbon black, acetylene blank, lamp black, mineral black, graphite, ultramarine, navy blue, cobalt blue, chrome green, chromium oxide, iron oxide,
Inorganic pigments such as cobalt purple and red lead, aluminum powder, and Pronoz powder.

Metal powder pigments such as copper powder, tin powder, lead powder, Fast Violet B, Green Gold, Paraprau 7, /Z
--r Nent Brown FG, Permanent Red 4
Azo pigments such as R, naphthol black B, or organic pigments represented by cyanine black, phthalocyanine blue, phthalocyanine green, and phthalocyanine pigments such as fZ, dioxazine violet, indathrene brilliant violet, and indathrene blue BC.

Vat dyes such as indigo, basic dyes such as methyl violet, methyl violet lake, malachite green, malachite green lake, Victoria blue lake, or acid violet, brilliant milling green, alkali blue lake, peacock pool lake, etc. It can contain dyes represented by acid dyes.

Furthermore, a pigment or dye having a white tone such as titanium oxide, zinc oxide, or tin oxide used in the above-mentioned surface layer 46 or 49 may be contained.

These light absorbers can be used alone or in combination,
30 parts by weight to 100 parts by weight per 100 parts by weight of binder resin
0 parts by weight, preferably io.

It can be contained in a proportion of parts by weight to 500 parts by weight,
The thickness of the intermediate layer 48 varies depending on the content or particle size of the light absorbent used, but is generally preferably in the range of 1 micron to 20 microns.

Further, as the binder resin used in the intermediate layer I#48 having this light-shielding effect, the intermediate layer 4 shown in FIG.
The resin used in forming 7 can be used.

In another example of the intermediate layer 48 shown in FIG. 5+c+, a thin reflective metal film, such as an aluminum vapor deposited film or a chromium vapor deposited film, can be used.

The surface layer 49 shown in FIG.
Examples of the binder resin 9 include polymethyl methacrylate resin, polystyrene resin, phenol resin, polyamide resin, alkyd-modified silicone resin, acrylic-modified silicone resin, polyester resin, polyarylate resin, polycarbonate resin, and polyvinyl butyral resin.

This surface layer 49 preferably contains a pigment or dye having a white tone such as titanium oxide, zinc oxide or tin oxide so that the toner image can be observed against a white background.
Furthermore, the light absorbing agent contained in the above-mentioned intermediate layer 48 may be contained in an amount that does not impair display contrast. In addition, the content of the pigment or dye that produces a white tone that is preferably contained in the surface layer 49 varies depending on the line type, particle size, hiding power, etc. of the white pigment or dye used. However, it can generally be contained in a proportion of 30 parts by weight to 1000 parts by weight, preferably 100 parts by weight to 500 parts by weight, per 100 parts by weight of the binder resin, and the film thickness is 3 microns to 30 microns. range is preferred.

The surface layer 46 used in the barrier support shown in FIG. This surface layer 46 can contain an appropriate amount of a pigment or dye having a white tone such as titanium oxide/zinc oxide or tin oxide so that the toner image I image can be observed on a white background. As the binder resin that holds these light absorbers or pigments or dyes having a white color tone in a dispersed state, the polymethyl methacrylate resin, polystyrene resin, and phenol resin used in forming the above-mentioned surface layer 49 can be used. , polyamide resin.

Resins such as alkyd-modified silicone resin, acrylic-modified silicone resin, polyester resin, polyarylate resin, polycarbonate resin, and polyvinyl butyral resin can be used.

The most preferable example of the present invention is shown in FIG.
In other words, the image carrier shown in FIG. 5fC1 provides a good white background and provides an extremely good display. Furthermore, a clear image with high contrast and high resolution can be obtained.

The light-shielding effect of the surface layer 46 varies depending on the type of light absorbent used, the particle size, the coloring power, the ratio of the light absorber to the binder resin, the thickness of the surface layer, etc. The content of light absorber is 30
The amount is preferably 100 parts by weight to 500 parts by weight, and the film thickness is preferably in the range of 3 to 30 microns.Details will be described in Examples, but according to the present invention The image carrier used in the display device has a structure in which a light-shielding layer is provided on the surface side of the photoconductor layer, which makes it possible to prevent unevenness in image quality caused by external light. are doing.

Next, unexploded IJJ will be explained according to an example.

(Example 1) A photoconductive image bearing belt (FIG. 5 f
bl) was prepared.

The image bearing belt in this embodiment has a two-layer structure, that is, a surface layer serving as a photoconductor layer and a light shielding layer is coated on a transparent conductive base film.

The transparent conductive base film is manufactured by Daicel Chemical Industries, Ltd.
The product name CELEC-KEC was used. Further, a photoconductor layer coating solution and a surface layer coating solution were obtained by making the following adjustments.

■) Dawg the photoconductor layer coating solution Cu and In to generate a semiconductor laser (820 nm).
100M parts of Ca2 powder having a sensitivity to ) and 7 parts of polybutyl methacrylate having an average molecular weight of 10,000 were made into a dispersion liquid in methyl ethyl ketone, and kneaded with a roll mill to prepare a coating liquid.

2) Surface layer coating liquid 'I' i0! Pigment 60 power (dish part, car bomb black (Colombian Carbon Japan (■Raven450)
0.6 parts by weight of polystyrene and 10 parts by weight of polystyrene (Estyrene MS-200 manufactured by Nippon Steel Chemical Industry Co., Ltd.) were added to toluene to prepare a solution having a solid content ratio of 300 parts by weight.

This solution was mixed with a sand mill disperser (2,00 Orpm) for 1
Dispersion was carried out for 0 hours to prepare a coating solution.The thus prepared coating solution was applied onto the transparent conductive base film to form a photoconductor layer with a dry film thickness of 70 microns.
Next, a surface layer was applied using a roll coater to obtain a dry film thickness of 15 microns, thereby obtaining a one-elephant carrying belt having a length of two screens (both sides of screen A and screen B).

Next, an image bearing belt for comparison was prepared using the following recipe. That is, a surface 1fi coating solution was prepared in exactly the same manner as in the preparation of the above sample, except that the use of carbon black in the surface layer coating solution was omitted. Next, this surface layer coating liquid is applied to the photoconductor layer using the same film and photoconductor layer as the transparent conductive base film used when creating the above-mentioned sample. A one-elephant support belt for comparison was prepared by applying the following to a film thickness of 3 microns after drying.

These two types of image carrier belts were each suspended in an image display device shown in FIG. 1 with the surface layer facing outward. Next, remove the light shielding plate that had been placed on the outside of the transparent plate of the image display device in advance, and leave it there for 1 minute.
One screen (one frame) of the elephant carrying belt was exposed to a 300 lux guiding light. After that, the image display device was operated so that a solid black image was formed on another screen that was kept in the dark while driving the single-elephant bamboo belt.

At this time, the contrast density (the value obtained by subtracting the base optical density value from the optical density value of the attached toner image) was measured. The contrast density at this time is expressed as the A-area contrast density. Next, the image display device was operated so that a solid black image was formed on the screen at the portion that had been exposed to room light for 1 minute in the initial stage. The contrast density at this time was measured. The contrast density at this time is expressed as a B-area contrast density (image density in an area where there is a history of indoor light irradiation).

The A-area contrast density and the B-area contrast density were measured in the same manner, except that the room light irradiation used in measuring the B-area contrast density was irradiated at 300 lux for 5 minutes and 10 minutes, respectively.

The results of these measurements are shown in the table below.

Indoor light When using the present invention sample When using the comparison sample 1 minute 1.0 1.0 1.1 0.95 minutes 1.0
1.0 1.1 0.710 minutes 1.0 1.0 1.
1 0.6 It is clear from the table above that the sample according to the present invention can form toner images with the same contrast density as the comparative sample, whether or not there is a history of light irradiation with room light. . Therefore, the display time on a certain screen (that is, the screen is being illuminated by room light during display) and the form of the image (parts to which toner is not attached are being illuminated by room light during display). Regardless of whether the display image is
There is no need to worry about uneven density or a decrease in image density.

(Example 2) A photoconductive image bearing belt (FIG. 5 f
bl) 2 were prepared.

The image bearing belt in this embodiment has a three-layer structure, that is, a transparent conductive base film is coated with a photoconductor layer, an intermediate layer, and a surface layer serving as a light shielding layer. The photoconductor layer prepared in Example 1 was coated with the intermediate layer coating solution described below to give a dry film thickness of 192 microns, and the surface layer coating solution of Example 1 was further applied on the intermediate layer to give a dry film thickness of 10 microns. An image bearing belt was obtained.

(Intermediate layer coating liquid) Ionomer resin aqueous dispersion (manufactured by Mitsui Petrochemical Industries, Ltd., Chemipearl S-100) was diluted with water:ethanol=6:4 to prepare a coating liquid. (Liquid viscosity: 4.5 centivoise) This belt was measured in the same manner as in Example 1. The results are shown in the table below.

1 minute i, i i, 1 5 minutes 1.1 1.1 10 minutes 1.1 1.1 When this belt was examined in the same manner as in Example 1, it was found that a stable image with no degree difference was obtained. Ta.

(Example 3) A photoconductive image bearing belt (Fig. 5 +
The image bearing belt in this example has a three-layer structure 9, that is, a photoconductor layer, an intermediate layer serving as a light-shielding layer, and a surface layer are coated on a transparent conductive base film. It consists of The following intermediate layer coating solution was applied on the photoconductor layer prepared in Example 1 to a dry film thickness of 2.
．． Further coat the intermediate layer with a dry thickness of 6 microns on the intermediate layer using the following surface layer coating solution,
An image carrying belt was obtained.

(Intermediate layer coating liquid) 10 parts by weight of carbon black (Columbian Carbon Japan, Colloidex A 3), 100 parts by weight of ethylene-acrylic acid copolymer aqueous solution (manufactured by Steel Chemical Industry, trade name: Zaixen-A solid content concentration 25 wt%) 3 parts by weight of water
5 parts by weight and 15 parts by weight of ethanol were placed in a porcelain ball mill and dispersed for 60 hours to obtain a coating liquid.

(Surface layer coating liquid) Tie, 30 parts by weight of pigment, alkyd modified silicone (
Xylene was added to KR-201) (manufactured by Shin-Etsu Chemical Co., Ltd.) to prepare a solution having a solid content of 15% by weight. This solution was mixed with a sand mill disperser (2000 rpm) for 3
A coating solution was prepared by dispersing for 0 hours.

It was measured by the method. The results are shown in the table below.

Area A Area B 111 Urgent theory■---■-■b----■----■■■--
1 minute 1.3 1.3 5 minutes 1.3 1.3 10 minutes 1.3 1.3 The image display device using the image carrier belt produced in this example is similar to that in Examples 1 and 2 described above. Compared to the image display device using the prepared image carrier belt, the image contrast was excellent, and the displayed toner image was very clear in terms of image clarity.

[Brief explanation of the drawing]

FIG. 1 is a very schematic configuration diagram of an example of a display device, FIG. 2 is an enlarged sectional view of the developing device portion thereof, and FIG. 3 is a schematic diagram showing the principle of forming f-stages in the brightly exposed portion. FIG. 4 is a schematic diagram showing the principle of image formation in the exposed dark area. 51st God 1.
Figure 5 (bl and Figure 5 1c) is a cross-sectional view of the image carrier used in the present invention.

Claims (9)

[Claims] (1) A supporting member having a photoconductor layer on a substrate having a transparent conductive layer is exposed to an optical signal from the substrate side, and at the same time as the exposure, a photoconductor layer corresponding to the exposed area of Hikari No. 48 is applied. Toner 1 that responds to optical signals by supplying toner to the side surface
An image display device of a type in which images are displayed by forming a photoconductor on a photoconductor layer, which is characterized in that the photoconductor that forms the toner photoconductor has a light-shielding layer on the photoconductor layer. Display device. (2) A one-image display device according to claim 1, comprising a layer supporting one toner image on the light-shielding layer! . (3) The image display device according to claim 2, wherein the layer supporting the toner image is a broken film containing a pigment or dye and a binder. (4) The image display device according to claim 3, wherein the pigment or dye has a white color tone. (5) The image display device according to claim 4, wherein the pigment having a white tone is titanium oxide, zinc oxide, or tin oxide. (6) The image display device according to claim 1, wherein the light shielding layer is a film containing a light absorber and a binder. (7) gold-striped powder in which the light absorber absorbs light in all or most of the wavelength range to which the photoconductor layer is sensitive;
The image display device according to claim 6, which is a pigment or a dye. (8) The one-image display device according to claim 6, wherein the light-shielding layer contains a pigment or dye having a white tone. (9) The image display device according to claim 8, wherein the pigment having a white tone is titanium oxide, zinc oxide, or tin oxide. 8. The image display device according to claim 7, wherein the pigment that absorbs light in a certain wavelength range is carbon black. (Iυ) The image display device according to claim 1'JA, wherein the light shielding layer is a thin metal film.