JP2632948B2 - Color image display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention receives and outputs an image signal or a facsimile signal from a floppy disk, an optical disk, a magneto-optical memory medium, a computer, or the like to output an image. The present invention relates to an image display method, and more particularly to an image display device for outputting diversified color images.

[Conventional technology]

Conventionally, video output from TVs and VTRs and output during interactive work with computers have been CRT (CRT) and TN
(Twisted nematic) High-definition images such as documents and graphics by WP (Word Processor) or facsimile have been output and displayed on paper as hard copies printed on liquid crystal display monitors.

Here, the CRT outputs a beautiful image with respect to the above-described moving image output, but with respect to an image that has been stationary for a long time, flicker and scanning stripes due to insufficient resolution lower visibility. Further, although the conventional liquid crystal display such as the above-mentioned TN liquid crystal realizes flatness, there are problems such as troublesome production such as sandwiching a liquid crystal on a glass substrate and a dark screen. CRT and TN liquid crystals also have a drawback that even during the output of a still image as described above, there is no stable image memory, so that the beam or pixel voltage must always be accessed.

On the other hand, the image output on paper is high definition,
Although a stable memory image can be obtained, the use of a large amount of it requires space for organizing, and wasteful use of resources due to disposal in large quantities does not become ridiculous.

Therefore, an image display method for calibrating a display device capable of expressing a high-definition image that has been obtained only as a hard copy with the same sharpness as a hard copy, and repeatedly displaying and erasing the image has been studied. Various display methods using a belt-shaped image carrier using methods such as electrophotographic recording and thermal recording have been proposed. For example,
57-171380 proposes a method for forming a color image by a thermal method.

[Problems to be solved by the invention]

However, in the image display method of the related art, it is necessary to arrange the color paint on the plover and select the color paint portion with a thermal head precisely, and to provide a means for keeping the temperature during display. Due to such disadvantages, practical application has been difficult. In order to solve the above-mentioned problem, the present inventors form an image on the image carrier using the difference in the optical scattering state, prepare a color pattern separately from the image, and use both as one unit. A combined image forming apparatus has already been filed (Japanese Patent Application No. 62-336125). According to this, since the image carrier and the color pattern are separate, a high-definition color image without flicker can be easily obtained. The image display principle of this is as shown in FIG. 16, in which the image is formed by the difference in the optical scattering state of the image carrier 10 by the polymer liquid crystal 21, that is, the transparent normal state and the opaque normal state. When light is irradiated, light passes through the color pattern 12 in the image portion formed on the image carrier, and furthermore, a color image is displayed.

The present invention is a color display device which can be widely applied in a color display method having the above-described structure, and provides a device capable of providing a sharp color display with a high color contrast.

[Means for solving the problem]

The present invention provides a color image display having a recording unit for recording the difference between transparent and opaque as an image on an image carrier having a polymer liquid crystal layer and a display unit for displaying a color image by combining the image carrier and a color filter. In the apparatus, the polymer liquid crystal layer is formed of a layer that becomes transparent by being rapidly cooled after heating, and after the polymer liquid crystal layer is once heated to an isotropic state, the holding time at the liquid crystal temperature until reaching room temperature is determined. A color image display device, wherein an image is recorded by controlling transmittance or scattering intensity, and a color image is displayed by disposing the color filter on an observer side of the carrier. The carrier can be protected from the outside, and the color contrast is large, and a clear desired color contrast can be easily obtained. That.

Hereinafter, a basic configuration of a color image display according to the present invention will be described in detail. In the present invention, as a polymer material for forming a transparent-opaque pattern on a sheet, a polymer liquid crystal exhibiting thermotropic liquid crystallinity or the like is suitable. Examples of this are pendant low molecular liquid crystals having a methacrylic acid polymer or siloxane polymer as the main chain, so-called side chain high molecular liquid crystals, and also used in the field of high-strength, high-elasticity heat-resistant fibers and resins. Polyester-based or polyamide-based main-chain polymer liquid crystals.

As the liquid crystal phase, a smectic, nematic, cholesteric, or other phase, or a discotic liquid crystal can be used.

Further, a polymer liquid crystal having a phase exhibiting SmC * in which asymmetric carbon is introduced into the polymer liquid crystal and exhibiting ferroelectricity can be preferably used.

Hereinafter, specific examples of the polymer liquid crystal will be described, but the present invention is not limited thereto.

The liquid crystal as described above changes the optical anisotropy depending on the temperature, the temperature rise and the cooling rate, and changes the light transmittance. However, irrespective of the polymer liquid crystal, the liquid crystal is in an opaque state and a transparent state. Any polymer material can be used as long as it can make use of the contrast. The principle of image formation in the present invention utilizes this property of a polymer material. Next, referring to FIG. 15, a description will be given of a principle process in a case where a polymer liquid crystal layer is provided on a transparent substrate. .

In FIG. 15, the state of light scattering is shown. This is heated above T ₂ (Tiso = isotropic state transition temperature) as shown in a by a heating means such as a thermal head or a laser or the like, and then rapidly cooled, as shown in FIG. Is fixed. In this quenched state, it is sufficient that the substrate is naturally radiated into the air without using any cooling means. This isotropic state is stable at room temperature or room temperature below T ₁ (Tg = glass transition temperature), and is also a stable state as an image memory.

Meanwhile after heating to T ₂ or more as a, liquid crystal temperature T ₁ ~
Holding toward one second to several seconds as an example between T _2,
b as described, increasing the scattering strength again in this retention time, return to the original scattering state again at room temperature, this state is stably retained in the T ₁ or less.

Further, as shown in the figure, if the liquid crystal temperature is held for about 10 ms to 1 second as an example between T _{1 and} T ₂ ,
In that part, an intermediate transmission state can be maintained at room temperature, and it can be used as a gradation expression.

That is, in this example, once heated to the isotropic state,
Before reaching the room temperature can be controlled transmittance or the scattering intensity at either time held in how much the liquid crystal temperature, and which in T ₁ or less can be held stably. Further, in the above, the temperature when returning to the scattering state,
It is more quickly close to T ₂ in the liquid crystal temperature, In addition, in the case, such as a relatively long period of time left in the liquid crystal temperature, even without heating once into isotropic state, occupies return to the scattering state of regardless of the previous state It is possible.

Using a liquid crystal having the above properties, a transparent portion and a scattering portion are formed according to a desired image by adjusting a heating state, and a color image is displayed by combining this with a color pattern and irradiating light. be able to.

Next, components for actually performing color image display will be described. First, the above-mentioned liquid crystal is applied to a substrate to form an image carrier. In this case, a liquid crystal is applied using a solvent to form a film on a transparent substrate made of glass, polyester, or the like that has been subjected to alcohol washing or the like. Coating characteristics can be adjusted, but solvents such as dichloroethane, DMF, cyclohexane, tetrahydrofuran (THF), acetone,
Ethanol or other polar or non-polar solvents or mixed solvents thereof are used, which are soluble in the polymer liquid crystal used and wettability with the material of the substrate on which it is coated or the surface layer provided on the surface of the substrate. , Depending on factors such as film formability.

In order to obtain a more beautiful image, the concentration by weight of the liquid crystal relative to the solvent is such that after addition and stirring, a clear solution or a viscous state is obtained. For example, when the polymer liquid crystals represented by the structural formulas (I) to (IV) are individually dissolved in dichloroethane, the concentration by weight of the polymer liquid crystals is 10%.
In, the solution is in the form of a cloudy micelle,
At a relatively high concentration of about 25% to 25%, a stable transparent viscous solution is obtained. This tendency is also observed in combination with several other types of polymer liquid crystals and solvents. This transparent viscous solution is thoroughly washed by means of an applicator, wire bar or dipping glass,
If the temperature is maintained at the liquid crystal temperature after coating on a base material such as polyester, an optical scattering film having very high uniformity can be obtained as compared with the case where the coating is similarly performed in the micelle state.

That is, in the process of evaporating the solvent after dissolving the liquid crystal in a solvent and applying it on a substrate, or after evaporating the solvent,
By keeping the substrate at a liquid crystal temperature (75 ° C. to 110 ° C.) for a certain period of time, a stable optical scattering film can be formed.

Among the liquid crystals, polymer liquid crystals such as those represented by the structural formulas (I) to (IV) are preferable, and a solvent used for coating is a mixed solvent of a plurality of solvents or a mixture other than the polymer liquid crystal material. , A coloring material and the like can be added in a range that does not adversely affect the coating. The obtained film thickness is 20% by weight based on the solvent weight of the polymer liquid crystal before coating.
In this case, it is about 10 μm, and generally 2 to 20 μm.

By scanning the thus obtained image carrier with a thermal head, a desired character or graphic pattern can be fixed as a transparent portion. This image carrier has an optical density of 1.2.
, A clear display of black on a white background can be obtained.

Further, the image can be deleted. That is, the entire surface of the image bearing member on which the image is recorded is heated to about 120 ° C., and then kept at about 105 ° C. for several seconds, the entire surface returns to the original white scattering state, and is stable even when returned to room temperature. Yes, recording and display can be performed again. This phenomenon can be controlled by changing the state of the liquid crystal shown in FIG. On the other hand, when the image carrier on which the image is recorded is guided onto a color film and irradiated with a backlight or a front light source, a color display image can be visually observed depending on the alignment of the color filter and the image carrier.

Commonly used color filters include, for example, R (red), G (green), and B at a pitch of 125 μm.
(Blue) can be used. The principle of color display is as follows. The image portion fixed as the transparent portion of the image carrier is composed of dots having the same pitch as the pitch of the color pattern of the filter, and if this dot is aligned with the R of the color pattern, red light is transmitted. , And G, the green light is transmitted. However, when the color light passing through the transmission portion of the image carrier is visually observed at a position deviated from the incident angle direction of the light, (a) the incident angle direction of the light When viewed from a position deviated from the image carrier, the color light that does not enter the field of view and hits the scattering portion of the image carrier is scattered, and they are clearly viewed as scattered light.

(B) When scattered on a separately provided scatterer (paper, frosted glass, etc.), the scatterer is clearly seen, while the light scattered by the scatterer of the image carrier is not strongly incident on the scatterer. Then it is dark and visible.

(C) When projected on a separately provided screen, it is clearly projected and viewed, while light scattered by the scattering portion of the image carrier is hardly projected and becomes a dark portion.

(D) When the light transmitted through the scattered light by the scattering plate at the stage of the illumination light is directly viewed, the light scattered by the scattering portion of the image carrier is visually observed as it is.

For example, assuming that only R (red) has transmitted through the transparent portion of the image carrier, the colors that can be clearly seen are the above (a) to (a).
(D) shows (a) cyan (a mixture of blue and green),
(B) red, (c) red, and (d) red. As a result, in any of the above four modes, a single color display image can be formed as a whole. In the above description, light transmitted through the image carrier without being scattered undergoes refraction or the like in the transmission process, but is substantially linear, and is referred to as substantially linear transmitted light.

The image on the image carrier is a normal thermal printer, FAX
And the like. For example, when an image carrier is passed through a thermal printer having a thermal head having a density of 8 dots per millimeter to form an image, the thermal head is separated from the thermal head by two image dots by another image processor. Prints a stripe pattern so that one dot is continuously turned on. this
R (red), G (green), B at 125 μm pitch
If (blue) is combined with a stripe color pattern or mosaic pattern sequentially formed and R is transmitted,
The light of G and B is incident on the scattering portion, and the scattered light of G and B can be visually observed as cyan in the mode (a), and in the modes (b), (c) and (d). G and B are dark, and R can be seen clearly.

As described above, when an image is formed on an image carrier by a thermal head or the like, in order to improve the efficiency of image formation, that is, to improve heat conductivity, a transparent portion-scattering portion (opaque portion) is formed on the polymer liquid crystal layer. In order to effectively and efficiently form the image, it is preferable that the thermal head be operated from the polymer liquid crystal layer side (image surface side) to form an image and not be operated from the image carrier side. When displaying an image, it is preferable to arrange the color filter side and the polymer liquid crystal side of the image forming medium so as to face each other in order to prevent color shift and position shift.
Furthermore, if the color filter is disposed on the viewpoint side of the image carrier and is viewed from the transparent substrate side of the color filter, the image carrier and the image surface are arranged in such a manner as to be protected from the outside by the color filter. Since the color filter can be set to be closest, a clear image without a viewing angle or color blur can be obtained, which is preferable.

As a configuration that satisfies the above relationship, as shown in FIG. 1, a color filter is disposed closer to the viewpoint than the image carrier, and the image surface side of the image carrier is opposed to the color filter side. In this configuration, an arrangement in which the thermal head easily contacts the image carrier, such as when the image carrier is formed in a film shape, can be applied to a display device such as described below, and the device is realized. In particular, for the reflection type display mode as shown in FIG. 5, the filter does not become a shadow of the philosophy of the image plane, and the color appearance is improved.

That is, in the above-described configuration, the image surface of the image carrier is protected by the color filter, the recording unit such as a thermal head can be simplified, and the color image does not become a shadow of the image surface, and the color image can be viewed. And excellent performance such as an increase in color contrast. The effect of the color contrast is remarkable especially in a display mode using reflected light.

Hereinafter, the embodiments (a) to (d) will be described with reference to the drawings.

FIG. 1 illuminates a color filter and an image carrier that have been aligned using an optical system that projects light having oblique directionality to a backlight. In this way, the color (R, red in the figure) that has passed through the transparent portion of the image carrier substantially linearly does not enter the visual field, and the color (G, green and B, blue) hitting the scattering portion is scattered. Is clearly recognized as a mixed color (cyan). When the transparent portion of the image carrier is not formed and the entire portion is a scattering portion, the color is white.

When the backlight optical system is not an obliquely directional light but an optical system that is substantially perpendicularly incident, the same color as above can be visually recognized by placing the viewpoint away from the front. You.

FIG. 2 illuminates an aligned color filter and an image carrier using an optical system that projects a backlight as directional light. A scatterer (paper, cloudy glass, etc.) is provided on the viewpoint side. Things. With this configuration, the color (R, red in the figure) that has passed through the transparent portion of the image carrier substantially linearly is scattered by the scatterer and visually recognized, whereas the light scattered by the scatterer of the image carrier is The scatterers do not strongly enter the scatterers, and the scatterers in the portion appear dark.

FIG. 3 shows an arrangement in which a color filter and an image carrier are arranged as in FIG. 2, irradiation is performed using the same optical system as in FIG. 2, and this is projected on a separately provided screen. The color of the filter (R, red in the figure) corresponding to the transparent portion of the image carrier is projected clearly on the screen.

FIG. 4 shows a case in which a backlight is radiated as scattered light by a scattering plate provided in the drawing to the aligned color filter and image carrier. In this case, the color (R, red in the figure) that has passed through the filter corresponding to the transparent portion of the image carrier is visually recognized, but the color that has passed through the filter corresponding to the scattering portion is the scattering portion of the image carrier. It looks dark because it is scattered again.

FIG. 5 shows a case where a front light is irradiated as a directional light onto a color filter, an image carrier and a reflective layer (e.g., an aluminum vapor-deposited layer) provided on the back surface of a polymer layer. In this manner, the same color visibility as described with reference to FIG. 1 can be obtained by the reflection type.
Incidentally, the reflection layer may be provided on the back surface of the image carrier.

Since the above-mentioned polymer liquid crystal has sufficient heat resistance and strong film strength, even if the polymer layer is directly rubbed and scanned with a thermal head, basically, repeated image formation by image writing and erasing is performed. However, in order to further increase the strength as required, a protective layer such as polyimide or aramid may be provided on the surface by lamination or the like, or a fluorine-based resin coating may be provided.

In addition, polymer liquid crystal has a large contrast between a transparent portion and an opaque portion (scattering portion), and the liquid crystal state changes rapidly with temperature, so that a clear image can be formed, and the effect of preventing crosstalk and the like is further enhanced. It is possible to obtain a desired excellent color contrast.

Further, at the time of drawing, it is also possible to obtain a gradation display by changing the intensity of a voltage applied to each dot by a thermal head or the like and changing the applied voltage pulse width.

〔Example〕

Embodiment 1 Hereinafter, the present invention will be described in more detail by showing an example in which the apparatus of the present invention is implemented as a color image display system.

In FIG. 6, A is an image processor, which is read by a color scanner, created by a keyboard or a mouse, edits and stores image information recorded in a memory such as a magnetic tape, and stores desired image information in B, It is sent to an output device such as C in a form suitable for the color output mode (specifically, so that the color filters of the output devices B and C and the position information of the color image match).

Here, the output process (i) shows a system example in which the drawing unit (recording device) B and the display devices E and F are separated systems, and the output process (ii) is a system in which the recording and display device is integrated. Here is an example of a system.

That is, the device of the present invention has at least a recording device and a display device, and may be separated or integrated.

First, a system using the recording device B and the display devices E and F will be described.

B is a drawing unit, which has a PL by a thermal recording member such as a thermal head in accordance with image information sent from the image processor A.
A visible image is recorded on a C sheet (polymer liquid crystal image forming medium). D shows an example of a PLC sheet recorded by the drawing unit B. The color projection was obtained by setting the PLC sheet (D) on which the image was recorded under the color filter of the color OHP (E) shown in FIG.
Here, image recording and display on the PLC sheet were performed in the mode described in FIG.

The color OHP (E) has a color filter on the image lid so that the position corresponding to each color of the image information drawn on the PLC sheet (D) matches the corresponding position of the color filter. Since they are arranged, a beautiful color normal image can be projected on the screen.

In addition, the PLC sheet (D) on which the image was recorded was placed on the surface of the panel F shown in FIG. 8, and by closing the lid on which the color filters were formed, a beautiful direct-view type display could be performed. .

The color panel F has illuminating lights inside, and the PLC sheet (D) placement table is composed of an optical system including a Fresnel lens and the like, and a color filter.

Here, a color image as depicted and described in FIG. 1 was formed.

The image-bearing sheet on which the color image has been displayed as described above may be erased by an erasing unit provided separately as needed and reused.

Next, a system using the output device C will be described.

The output device C includes a recording unit including a thermal head 11, a scattering plate 21, an image carrier belt 10, a color filter 12, a display unit including a Fresnel lens 20, and a backlight 19, and a surface heater 1.
3. An image erasing unit including the temperature sensor 16, a roller 15, and a conveying unit including an image carrier belt. The image carrier belt 10 is a polymer liquid crystal represented by the following structural formula on a polyethylene terephthalate transparent substrate. Was dissolved in dichloroethane to make a 20% solution, which was applied with a wire bar, and left in an oven at 90 ° C. for 15 minutes to form an endless shape as a white scattering layer.

The drive roller 17 is driven by a motor (not shown),
All other means can be operated by mechanical components or electrical and electronic components (not shown).

First, at the time of image writing, when the driving roller 17 is driven in the direction indicated by the arrow and an image signal is output to the thermal head (multi-head) 11 by a facsimile signal from another facsimile, the image carrier belt 10 An image-like transparent portion pattern is formed in the upper heated portion. With this operation, the image-form transparent portion pattern for one page of the A4 size is sequentially formed, and then the display portion 20 stops.

With the structure as described above, in the display unit, a beautiful color image can be formed as shown in FIG. 4 and the description thereof in combination with the stripe or mosaic color filter provided in the display unit due to the difference in the scattering transparent state of the image carrier. Is displayed.

Further, this image did not change even if left as it was for 100 days.

Next, the image is erased by using the halogen roller 32 including the halogen lamp 14 and the roller 15 and the image heater 13 and displaying the predetermined image, and then driving the drive roller 17 again in the direction indicated by the arrow to start driving. At this time, the halogen roller 32 is controlled at approximately 115 ° C., and the surface heater 13 is controlled at approximately 95 ° C. from the detection output of the temperature sensor 16. In this manner, when observing the state of the image carrier belt 10, it can be seen that this portion becomes almost transparent when passing through the halogen roller 32, and that the entire surface again scatters white when passing through the surface heater 13. . By this operation, the entire display image is erased, and a white scattering state is obtained again. Here, the width of the surface heater 13 used in the above configuration in the belt moving direction was approximately 40 mm, and the entire surface was set to at least 74 ° C. or higher.

In this apparatus configuration, even if the polymer layer is directly rubbed and scanned with a thermal head, the polymer liquid crystal has sufficiently high heat resistance and film strength, so that it can basically be used for repeated image formation. Although there is no problem, a protective layer such as polyimide or aramid may be provided on the surface by lamination or the like, or a fluorine-based resin coating may be provided to further increase the strength as needed.

As a specific example, an image was formed by providing a 3.5 μm aramid sheet by lamination.
The results were all good.

According to experiments by the present inventors, the operation of writing / erasing the image was stable at least 200 times or more. Note that a sufficiently clear image was obtained even at a belt moving speed of 40 mm / sec.

In addition, as shown in the partially enlarged view of FIG. 10, the present apparatus configuration uses a normal serial head as the thermal head 18 instead of the full-multi thermal head 11 and employs a drive configuration (not shown) to drive the image carrier belt 10. It operates satisfactorily even with a configuration in which serial scanning is performed in the different direction and the vertical direction.

Further, it is also possible to obtain a gradation display by changing the intensity of the voltage applied to each dot of the thermal head 11 and changing the applied voltage pulse width.

Embodiments 2 and 3 Color images were displayed using the same apparatus as in Embodiment 1 (FIG. 9) except that the configuration of the display section was changed as described below. A beautiful color image was obtained.

Embodiment 2 Fig. 11 Color filter-image carrier-Fresnel lens-light source Embodiment 3 Fig. 12 Scattering plate-color filter-image carrier-Fresnel lens-light source Similarly, it operates well even with a serial scan configuration.

Embodiment 4 FIG. 13 shows a projection type color image apparatus having the structure shown in FIG. 3, which can be enlarged and projected by a lens 56. In the present embodiment, the gap between the color filter and the polymer liquid crystal is kept constant by the holding plate 36.

Example 5 FIG. 14 is a reflection type display device having a configuration shown in FIG. 5 and using a reflector, and a beautiful color image having a large coloration contrast as described in FIG. Obtained.

〔The invention's effect〕

As described above, according to the present invention, the polymer layer capable of obtaining a contrast represented by the strong contrast of the transparent part-scattering part of the polymer liquid crystal is used as an image carrier, In a device that uses a contrast as an image, converts and records a color image as the above-described contrast, and combines this with a color filter to display an image, the color filter of the display unit is disposed closer to the viewpoint than the image carrier. Therefore, the image surface of the image carrier can be protected, and the resulting image has excellent performance such as a large color contrast and beautiful.

Furthermore, the formation of the transparent portion and the scattering portion can be easily recorded / reproduced / erased using a thermal head or laser heat or the like, and in combination with this and a color filter, a clear full-color image can be formed in principle. I can do it.

[Brief description of the drawings]

1 to 5 are schematic views of a color display unit for explaining a color image display method according to the present invention. FIG. 2 shows a color image projected on a scatterer, and FIG. 3 shows a screen. Projection, FIG. 4 uses a scattered light source,
FIG. 5 is based on reflected light, FIG. 6 is an explanatory view of an image display system according to the apparatus of the present invention used in the first embodiment, and FIG. 7 is a schematic diagram of a slope of a color OHP used as a display device in the first embodiment. FIG. 8, FIG. 8 is a schematic perspective view of a color panel used as a display device in Example 1, FIG. 9 is a configuration diagram of a color image display device used in Example 1, and FIG. FIG. 11 and FIG. 12 are configuration diagrams of a color image display device according to the second and third embodiments, respectively. FIG. 13 is a device that displays by screen projection according to the fourth embodiment. FIG. 14 is a diagram showing a configuration of a reflection type display device using a reflector in Example 5, FIG. 15 is a diagram showing a relationship between temperature and light transmittance of a liquid crystal according to the present invention, and FIG. The figure shows the principle of the color display method. 10 Image forming medium 11 Thermal head 12 Color pattern (color filter) 13 Surface heater 14 Halogen lamp 15 Roller 16 Temperature sensor 17 Drive roller 18 Fresnel lens 19 … Background substrate 20… Display unit 21… Liquid crystal layer 22… Transparent substrate 27… Transparent part 28… Scattering part 29… Backlight 30… Incident light 32… Halogen roller 31… Scattering plate 33 Positioning member 34 Reflector 35 Light source 36 Holder 37 Lens 38 Screen 11 'Thermal head (serial head)

Claims (2)

(57) [Claims] 1. A color image having a recording section for recording the difference between transparent and opaque as an image on an image carrier having a polymer liquid crystal layer and a display section for displaying a color image by combining the image carrier and a color filter. In the display device, the polymer liquid crystal layer is formed of a layer that becomes transparent by being rapidly cooled after heating, and after the polymer liquid crystal layer is once heated to an isotropic state, is maintained at a liquid crystal temperature until reaching room temperature. A color image display device, wherein an image is recorded by controlling transmittance or scattering intensity, and a color image is displayed by disposing the color filter on an observer side of the carrier. 2. The color image display device according to claim 1, wherein a display is provided by disposing a reflection plate on a side of said image carrier opposite to a viewer side.