JP2001174726A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device of high luminance and a low power consumption. SOLUTION: The picture display device is provided with one or plural light sources 1402 and 1403, a controller which controls light 1404 and 1405 from light sources 1402 and 1403, and a medium 1401 irradiated with light 1404 and 1405, and light 1404 and light 1405 in two directions are made to cross each other and are projected to the medium 1401, and the optical response in the periphery of an intersection 1401 between light 1404 and 1405 in the medium 1401 is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an image display device.

[0002]

2. Description of the Related Art In an accelerating information society in recent years,
The role of displays as man-machine interfaces for exchanging information between humans and machines is growing.

[0003] Conventional displays include a type in which a phosphor is excited by an electron beam or ultraviolet light to emit light (CRT,
Fluorescent display tube, field emission display, plasma display, inorganic EL, etc., type that modulates the state of pixels by an electric field (liquid crystal display, electrophoretic display, etc.), type that uses light emission by recombination of holes and electrons (organic) EL, LED display, etc.) are known. In any case, each pixel is directly stimulated by a change in applied voltage or current, and a mechanism that causes a “color change” (a change in optical response) in each pixel.

[0004] On the other hand, a type of display in which an optical response in each pixel is changed by a light stimulus is also known.

As one example of such an optical display, Lee et al., SID 97 Digest,
There is a type using a laser as reported in p631-634 (1998).

The display by Lee et al. Is shown in FIG.
The white laser light emitted from the Kr-Ar laser is divided into three lines, and each light is converted into red, green, and blue filters and acoustic waves for modulating the light intensity. After passing through the optical modulation element, it is placed on the same optical axis. It has a mechanism to project the laser beam on the screen provided in front while oscillating the laser beam direction up and down and left and right using a rotating polygon mirror and a vibrating mirror. It is possible to project and form an image. However, in this display, the luminescent spot is formed at the intersection of the laser beam and the screen, so that the display is not a thin flat display.

As a type capable of realizing a thin flat display, a type of display in which a bright spot is formed by using up-conversion by two-photon absorption at the intersection of two laser beams has been reported.

[0008] An example of a thin flat type is disclosed in US Pat.
No. 3 and FIG. 16 shows an outline of the mechanism. In FIG. 16, reference numerals 161 and 162 denote laser light sources, and 163 and 164 denote mirrors. The main body 165 is obtained by doping rare-earth ions into a transparent medium having a low phonon generation rate.

At the intersection 168 of the two laser beams, 166 and 167, the rare earth ions doped into the medium in the body 165 are excited by two-photon absorption and emit fluorescence.

At this time, the sum of the wavelengths of the two laser beams, 166 and 167, is set to the wavelength of the absorption band of the rare earth ion while using infrared light for the laser beams, 166 and 167, and setting the difference between the wavelengths sufficiently large. , The fluorescence is emitted only at the intersection 168. This is due to the photon 2 of one of the lasers to cause two-photon absorption.
This is because the energy of the individual is too large or too small, but the sum of the energies of the photons of the two lasers is set to be within the absorption band of the rare earth ions.

The intersection point 168 is moved by means for changing the direction of the laser light, such as a mirror, and at the same time, the intensity of the light is modulated, whereby an image is displayed.

[0012]

As described above, a display using two-photon absorption provides a powerful means for realizing a flat display without using a complicated matrix wiring or TFT. Can be done.

However, a display using fluorescence by two-photon absorption has the following problems. That is, since the intensity of the fluorescent light directly depends on the intensity of the laser beam, which is the input light, and since the two-photon absorption itself does not occur at high efficiency, practical brightness is achieved only in an extremely small display. Can not. In particular, in a high-definition display, the number of pixels increases, so that only a smaller display can be realized. There has been proposed a configuration in which the luminance is increased by increasing the number of lasers. However, problems arise in terms of cost, uneven luminance, and heat generation due to excess energy.

[0014]

SUMMARY OF THE INVENTION Accordingly, the present invention comprises one or more light sources, a controller for controlling the light from the light sources, and a medium for irradiating the light, and intersecting the light from two directions. An image display device is provided which irradiates the medium with the light and changes the optical response around the intersection of light in the medium.

The image display device of the present invention may have different wavelengths of light from two directions.

Further, in the image display device of the present invention, the intersection may be moved while the angle at which the light intersects is fixed.

Further, in the image display device of the present invention, the medium may be:
At least one organic material comprising polydiacetylene, polythiophene and a charge transfer complex, and CdSe, CuC
l, CdS, ZnSe, ZnS and at least one of inorganic semiconductors composed of ZnO.

Further, the image display device of the present invention may perform gradation expression by controlling the amount of light applied to the medium.

Further, in the image display apparatus of the present invention, the medium may be divided for each pixel, and in that case, a plurality of types of pixels may be divided using a plurality of types of media having different optical response wavelengths. And a plurality of types of pixels may be arranged in a predetermined order.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings, but the present invention is not limited to these embodiments.

The image display apparatus of the present invention irradiates light such as near-infrared light in two directions from a light source in such a manner as to cross a medium formed on a substrate, and absorbs, reflects, and refracts visible light. An image is displayed by changing the optical response such as transmittance and transmittance. A mechanism for irradiating a medium with light in the image display device of the present invention to induce a change in optical response will be described.

In the present invention, a medium containing, for example, a mixture of an organic material and an inorganic semiconductor on a substrate is used. In particular, semiconductor ultrafine particles are preferably used as the inorganic semiconductor.

As the organic material, polydiacetylene, polythiophene, tetrathiofulvalene-chloroanil (TTF-CA) or the like is used. As an example, a change in optical response characteristics of polydiacetylene due to light irradiation will be described.

The polydiacetylene system can induce changes in optical response such as absorption, refraction, transmittance, and reflectance of visible light depending on whether or not light irradiation such as near infrared light is performed. Material.

The phenomenon of such a change in the optical response characteristics is caused by, for example, the absorption of photons by the molecules shown in FIG. It is attributed to the fact that changes occur. The structure changes from acetylene type (a) to butatriene type (b) by absorbing light.
With respect to one absorbed photon, about several hundred to several thousand units of the unit composed of four carbon atoms and side chains R and R 'shown in FIG. 1 undergo structural changes.

However, the rate of occurrence of such a crystal structure change tends to be high in a wavelength region where the light absorption intensity is small. Therefore, a highly efficient structural change and a change in optical response induced by the structural change are not observed. Therefore, in order to induce a highly efficient optical response change in the present invention,
A mixture of the above organic material and an inorganic semiconductor is used.

As the inorganic semiconductor, cadmium selenide (CdSe) ultrafine particles are used.

The semiconductor ultrafine particles are irradiated with two light beams having appropriate wavelengths, such as near-infrared light, for example, crossing each other to resonate with the two-photon absorption band of the CdSe ultrafine particles.
This excited state can be generated with high efficiency, and the excited state moves to the organic material in about nanoseconds. As a result, by using a mixture of the organic material and the semiconductor ultrafine particles as described above, it is possible to efficiently generate an excited state similar to that obtained by directly irradiating the organic material with light.

As described above, the structural change is induced with high efficiency by the weak light irradiation, and accordingly, a wide and large change in the optical response coefficient to visible light is induced. further,
Even after the stop of the light irradiation, the change in the optical response can be maintained for about 10 milliseconds or more, so that it can be said that the optical response is suitable for the pixel material by the low intensity light irradiation.

Such a change in the crystal structure is observed almost similarly in TTF-CA and polythiophene in addition to polyacetylene, and thus can be said to be suitable as a pixel material. In addition, a material having similar properties may be used.

The intersection of two lights that cause a change in optical response such as reflectance, refractive index, transmittance, and absorptance to light irradiation can specify an arbitrary area in the medium. In addition, the width of this region is about the wavelength, for example, when two lights are laser light, and is about 500 nm ²
From about 1 μm ² . This area is defined as a pixel, and the medium is regarded as an aggregate of pixels, and the position where the two lights are irradiated is controlled using a mirror and a lens to perform addressing, and at the same time, switching of the optical response change of each pixel. , Depending on the presence or absence of irradiation.

First, a first embodiment of the present invention will be described. The material constituting the image forming portion of the image display device of the present embodiment is such that CdSe ultrafine particles are dispersed in 4U2-polydiacetylene, and the average particle size of the CdSe ultrafine particles is about 3 ± 0.3 nm. , Pixel material 1 cubic mm
So that about 10 ¹⁵ or more of them are included in each area.

Next, a method of combining a medium using the above materials with an optical system will be described. First, FIG. 2 schematically shows an overview of a main part of a panel using this medium.

In FIG. 2, reference numeral 21 denotes an image forming unit, 22 denotes a laser beam for an X-direction address, 23 denotes a laser beam for a Y-direction address, and 24 denotes an intersection of the two laser beams. At the intersection 24 of the two laser beams, two-photon absorption and a change in the optical response to visible light occur, thereby selectively rewriting the image. Although not shown, the image forming unit 21 coats the above-described medium on a reflective plate that reflects visible light.

FIG. 3 shows the components of the panel. The panel has a shape in which an image forming unit 21, an X-direction scanning mechanism 31, and a Y-direction scanning mechanism 32 are sequentially bonded. Where X
Laser light propagates in the direction scanning mechanism 31 and the Y-direction scanning mechanism 32 in the direction of the arrow in FIG. X direction scanning mechanism 3
1. The laser light emitted from the Y-direction scanning mechanism 32 is
The light is guided into the image forming unit 21 by mirrors 33 provided along two sides of the image forming unit 21. Of the laser beams 22 and 23 guided into the image forming unit 21, light that has penetrated the image forming unit 21 to the opposite side is absorbed by laser traps 34 provided on two sides opposite to the mirror 33.

The mechanism of the laser beam X-direction scanning mechanism 31 and the Y-direction scanning mechanism 32 are shown in FIGS. 4 and 5, respectively. 4 and 5 are almost the same except that the direction of the laser is the X direction and the Y direction. Therefore, description will be made using only FIG.

In FIG. 4, reference numeral 41 denotes a laser diode. The oscillation wavelength of the laser diode 41 is about 800
nm, the output is about 50 mW. The oscillation wavelength of the laser diode 51 of FIG. 5 is about 850 nm and the output is about 50 mW
It is.

Reference numeral 42 denotes an optical shutter for adjusting the intensity of laser light. In this embodiment, an AC-driven holographic liquid crystal shutter is used, and a Pockels cell is used as the optical shutter 52 in FIG. 42 operates at a frequency of about 1 MHz, 52 operates at a frequency of about 50 MHz,
Adjust the intensity of laser light. By modulating the intensity of the laser light in this way, the two-photon absorption amount and, consequently, the change amount of the optical response are changed, and the gradation can be expressed.

After the laser beam is intensity-modulated by these elements, the converging lens system 43 and the condensing lens system 44
, And is incident on the rotating polygon mirror 46 by the mirror 45. The rotating speed of the rotating polygon mirror 46 is about 10 kilohertz. The direction of rotation is as indicated by the arrow. Rotating polygon mirror 46 used in this embodiment
Is a micromachined hexagonal mirror with a thickness of about 500 μm and a diameter of about 4 mm.
The shape is not limited to these.

The rotating polygon mirror 46 has a correction lens 47
Are combined. The correction lens 47 corrects the direction of the light and collects light again. The light passing through the correction lens 47 is incident on the plane light guide 48, and the traveling direction is aligned in the X direction by the parabolic mirror 49, as indicated by the arrow in the plane light guide 48.

The laser light whose traveling direction is aligned is emitted by the mirror 33 in the direction perpendicular to the plane on which the laser light travels, and is guided to the image forming unit 21, where the optical response to visible light changes at the intersection of the laser light. As a result, an image can be displayed. The position in the Y direction of the laser light that strikes the mirror 33 is continuously changed by the rotating polygon mirror 46, and the position in the Y direction of the medium irradiated with the laser light is also changed. By changing the optical response of the medium at a certain site by irradiating light from these two directions, this minute area is treated as a pixel, and by moving this minute area, a continuous medium layer is formed as an aggregate of minute pixels. It can be handled. It should be noted that the time for irradiating a laser beam to a minute area equivalent to one pixel of the image forming unit 21 is about 15 minutes.
msec. Further, the size of one pixel when the laser is irradiated to that extent is about 1 cubic mm.

In this embodiment, in an image display device using two-photon absorption, a change in an optical response coefficient such as a refractive index, an absorptivity, a transmittance or a reflectance is used. Therefore, in the image display device using the fluorescence by two-photon absorption, the upper limit of the brightness is the laser output, whereas in the present embodiment,
A high-brightness reflective display without such a limit can be realized. The change in the optical response coefficient occurs immediately after the start of light irradiation, and lasts for about 10 msec to 15 msec after the end of irradiation, so that a high-quality image having high contrast is realized. Furthermore, gradation can be expressed by modulating the intensity of the laser light, and the intensity of the laser light can be changed continuously, so that display with a large number of color tones is possible.

In the case of a display utilizing fluorescence, it is necessary to use a large number of lasers in order to obtain a high-brightness and large-sized display. On the other hand, in the display device of this embodiment, two lasers are used. It is possible to obtain a large-sized display with sufficiently high brightness by using, so that it can be said that it is also effective in terms of cost.

Further, the image display device of the present embodiment can transfer energy with respect to the organic material with high efficiency by using semiconductor ultrafine particles. Therefore, the number of photons required is about 1/1000 to 1 / 10,000 as compared with the conventional self-luminous type display using two-photon absorption, and the effect is also obtained in terms of power consumption. I can do things.

In the present embodiment, the angle formed by the two lasers is always kept almost perpendicular.
The intersection of the two lasers, the shape of the area worthy of a pixel,
The size is uniform. Therefore, a more precise image can be obtained.

Next, a second embodiment will be described.
This embodiment will be described focusing on portions different from the first embodiment.

The present embodiment is different from the first embodiment in that the medium of the image forming section is divided for each pixel. FIG.
As shown in FIG. 5, in the image forming section 21 of the present embodiment, a first reflecting plate 64 that reflects visible light, and a second reflecting plate that reflects infrared light
And a light guide path 61 made of polymethyl methacrylate, and pixels 62 are provided on the upper surface thereof by patterning. In the pixel 62, a medium whose optical response changes is provided separately. In this manner, by dividing the medium for each pixel 62, the X-direction address laser light 22 and the Y-direction address laser light 23 are separated. Intersection,
That is, the pixel 63 to be rewritten becomes clear.

Each pixel 62 has three types of red (R), green (G), and blue (B). For example, RGBRGB
Are provided in order so that...

As shown in FIG. 7A, each of these patterned pixels 62 is formed by dispersing semiconductor ultra-fine particles 72 in a medium containing an organic material 71 as a main component, and is provided on a light guide path 61. It is formed by being done. A taper 73 is provided on the side surface of the pixel 62 so that the laser light in the light guide path 61 can easily propagate to the pixel 62.

In this embodiment, (i) 4U2-polydiacetylene, (ii) TTF-CA, (iii) 4BCM
By using three types of U-polydiacetylene as an organic material, pixels 62 of R, G, B and three colors are formed.
Among them, R includes a mixture of (ii) and (iii), G includes a mixture of (i) and (iii), and B includes a mixture of (i) and (ii). About one to one. The semiconductor ultrafine particles 72 are CdSe ultrafine particles having a particle diameter of about 3 nm ± 0.3 nm, as in the first embodiment.

Next, a method for manufacturing the pixel 62 will be described.

In this embodiment, as a method for forming each of the pixels 62, an ink jet method is used as shown in FIG. However, the method for forming the pixel is not limited to this, and various methods such as a spin coating method, a doctor blade method, a spray method and a patterning method by exposure can be used.

FIGS. 7B and 7C are a side view and a perspective view, respectively, of a process of forming the pixel 62 according to the present embodiment. FIG.
As shown in (b), the organic material 71 and the semiconductor ultrafine particles 7
The mixed solution of No. 2 is ejected onto the light guide path 61 from the ejection nozzle 74 by an ink jet method. In the present embodiment, when forming a mixed solution of the organic material 71 and the semiconductor ultrafine particles 72, xylene is used as a solvent. In addition, in order to form the taper 73, as shown in FIG. 7C, the solution is applied more densely at the center of the pixel 62.

In this way, the pixel 62 having a short side of about 150 μm and a long side of about 300 μm is formed. The distance between the pixels is about 300 μm.

Next, the mechanism of the change in the optical response of the pixel 62 in the present embodiment formed as described above will be described with reference to FIG.

In FIG. 8, the laser light emitted from the X-direction scanning mechanism 31 and the Y-direction scanning mechanism 32 formed in the same manner as in the first embodiment is transmitted to the light guide path 61 in the image forming section 21 by the mirror 33. The incident light and some light propagate into the pixel 62. In FIG. 8, the green pixel G is irradiated by both the X-direction address laser light 22 and the Y-direction address laser light 23, so that two-photon absorption occurs, the optical response of the pixel G changes, and the color changes. It has changed from black to green. This is because, of the visible light, the absorptance of light near green was reduced by the irradiation of the laser light, so that the spectrum other than green of the light incident on the pixel G was absorbed by the pixel G, and the rest was the first reflector This is because the light is emitted as scattered / reflected light.

At this time, the contrast was about 3 to 10, although it also depends on the spectrum of the external light. this is,
The contrast is almost the same as that of the image display device using fluorescence using a large number of lasers, and the image display device of the present embodiment using only two lasers can be said to be effective in terms of cost and power saving.

In FIG. 8, only one light beam which enters the pixel 62 is shown as the laser beams 22 and 23, but the light guide path 61 in the image forming section 21 and the X-direction scanning mechanism 3
1. In the Y-direction scanning mechanism 32, light actually propagates through various paths.

The image display device according to the present embodiment can be applied to, for example, the following. FIG. 9 is a diagram showing an application to an advertisement medium provided on a pillar 91 in a train station yard or the like. In the image display device 92 according to the present embodiment, both the light source and the scanning mechanism can be formed to be thin, and the mirror can be formed as a thin film integrally with the main body. Therefore,
Plasticity can be given to the entire image display device, and the display can be installed along the curved surface of the pillar 91.

Next, a third embodiment will be described.
The present embodiment will be described focusing on portions different from the second embodiment.

The present embodiment is an example in which complementary color pixels of cyan (C), magenta (M), and yellow (Y) are used instead of the primary color pixel arrangement using three colors of R, G, and B. is there. Each pixel uses a mixture of an organic material and semiconductor ultrafine particles as in the second embodiment. However, for C, M, and Y, 4U2-polydiacetylene, T
TF-CA, 4BCMU-polydiacetylene is used.
Conditions such as the size of the semiconductor ultrafine particles and the size of the pixel may be the same as those in the second embodiment.

The basic components of the display device of this embodiment are the same as those described in the second embodiment. In this embodiment, the panels are panels of C, M, and Y colors. Are used. Each panel has pixels of any of the colors C, M, and Y.

FIG. 10 is a configuration diagram of a complementary color panel according to this embodiment. As shown in FIG. 10, in the present embodiment, the cyan panel 101 and the magenta panel 10
2. The yellow panel 103 is overlaid. One set of the X-direction scanning mechanism 31 and the Y-direction scanning mechanism are combined for each panel. FIG. 10 shows only the X-direction scanning mechanism 31. The X-direction scanning mechanism and the Y-direction scanning mechanism may be the same as those shown in FIGS.

The panels of each color are formed by the ink jet method as in the second embodiment, and after the three panels are overlapped, the whole is sealed in a vacuum container. Inkjet printing is performed in a dry nitrogen atmosphere. Vacuum sealing and preparation in a dry nitrogen atmosphere have the effect of extending the life of the panel because the reaction of water or oxygen with the organic layer is prevented.

According to the pixel configuration of the complementary color system adopted in the present embodiment, it is not necessary to provide pixels of three different colors, so that the light use efficiency is improved, and the pixel configuration of the primary color system is used for both brightness and contrast. It was better than it was. The contrast reached a maximum of about 30.

Next, a fourth embodiment will be described.
The present embodiment will be described focusing on portions different from the second embodiment.

This embodiment is different from the second embodiment in the light guide path. In the light guide path used in the second embodiment,
Occasionally, a malfunction may occur due to a malfunction of the scanning mechanism or an unevenness of the optical system, and color mixing may occur in the panel. Therefore, in the present embodiment, a study using the structure shown in FIG. 11 is performed.

In this embodiment, as shown in FIG. 11A, two types of light guide paths are arranged to face each other. Each is separated by a pixel pitch in the X direction and the Y direction, and is defined as an X direction light guide path 111 and a Y direction light guide path 112. And
At the intersection of the X-direction light guide 111 and the Y-direction light guide 112, the organic material-semiconductor ultrafine particle dispersion layer 11 is formed as a pixel.
3 between them.

The organic-semiconductor ultrafine particle dispersion layer 113 has a taper with respect to both the X-direction light guide 111 and the Y-direction light guide 112. The taper is shown in FIG.
As shown in FIG. 11 (c), it spreads upward in the X direction and spreads downward in the Y direction. As shown in FIG. 11, light enters from above and below the organic material-semiconductor ultrafine particle dispersion layer 113, that is, from the X-direction light guide 111 and the Y-direction light guide 112, respectively. Return to At this time, the organic material which received light simultaneously from the upper and lower sides and intersected by the arrow in FIG.
Writing is performed only on the semiconductor ultrafine particle dispersion layer 113. The change in the optical response of the organic material-semiconductor ultrafine particle dispersion layer 113 caused by writing is the same as that described in the second embodiment.

A method for manufacturing a display device having a double-sided tapered structure according to this embodiment will be described. First, quartz glass that has been treated in advance to increase the surface energy,
A mask layer made of evaporated nickel and a quartz glass similar to that described above are laminated. In the mask layer, a dummy spacer is provided at a portion that will be an end portion of a portion that will be an intersection of the X-direction light guide 111 and the Y-direction light guide 112 later.

Next, the quartz glass formed on the upper surface is etched with a solution in which hydrofluoric acid and ammonium fluoride are mixed in a ratio of about 1: 7 so as to form a stripe having a thickness of about 300 μm and an interval of about 300 μm. At this time, the mask layer and the dummy spacer are not etched.

The three-layer thin plate is turned upside down and placed on a reflector that reflects visible light. Then, in the same manner, the quartz glass on the non-etched side is etched in a direction perpendicular to the above-described direction. Thereafter, by removing the mask layer, as shown in FIG. 12, the quartz glass crosses at right angles and is kept at equal intervals via the dummy spacer-121. In FIG. 12, the reflection plate is not shown.

These are referred to as an X-direction light guide path 111 and a Y-direction light guide path 112.
Is performed.

This injection step is performed in a dry nitrogen atmosphere, and the entire panel is maintained at about 300 ° C. After injection, the melted organic material-semiconductor ultrafine particle dispersion layer 113 is sucked into the intersection of the light guide paths by capillary action. Further, the surface energy of each light guide path is higher than the surface energy of the melted organic material-semiconductor ultrafine particle dispersion layer 113. Therefore, the melted organic material-semiconductor ultrafine particle dispersion layer 113 spreads over the surface of each light guide path, and a taper is formed. FIG.
In FIG. 2, only one needle of the injector 122 is shown,
A large number of injectors may be arranged and injected.

In the present embodiment, with such a configuration,
Processing is easy, and an image display device without color mixture in the panel can be obtained.

Next, a fifth embodiment will be described.

This embodiment is a reflection type display adopting a method of forming an image by performing scanning with light from one light source.

FIG. 13 is a perspective view showing the display of this embodiment. In FIG. 13, reference numeral 131 denotes a curved surface having a mirror surface on the inner surface and formed by a combination of parabolas. Also, about 810 nm from the laser light source 132
Is split by a beam splitter 133 and the like, passes through an optical system 134 including a shutter using a Pockels cell, a converging lens, a condenser lens, and the like, and passes through a rotating polygon mirror 135 and a curved surface 131. Then, after changing the direction to enter the image display unit 138 by a mirror (not shown), the laser light 136 from the X direction is changed.
Using laser light 137 from the Y direction, an image is displayed in the same manner as in the above-described embodiment. The image display section 138 may be formed using the same material and method as in the above embodiments.

In the present embodiment, the optical response of the medium can be changed only by performing scanning with one light source. Further, a low-cost image display device can be created.

Next, a sixth embodiment will be described.
The present embodiment will be described focusing on portions different from the second embodiment.

This embodiment is different from the second embodiment in the laser scanning mechanism. In the present embodiment, a group of reflecting mirrors formed by micromachining is arranged on one side in each of the X direction and the Y direction of the image forming unit, and the pixels are designated by irradiating a laser beam by mechanically controlling them. It is characterized by the following. As for the material of the display portion, 4U2-polydiacetylene, TTF-CA, and 4BCMU-polydiacetylene are used as organic materials as in the third embodiment, and three layers using these are overlapped to perform full-color display. .

FIG. 14 is a schematic diagram for explaining the pixel designation in this embodiment. Reference numeral 1401 denotes the first layer 1402 of the medium.
Is a laser light source that generates light of a wavelength of about 850 nm and modulates the intensity of the light with an optical shutter (output of about 50 m
W). Reference numeral 1403 denotes a laser light source (output: about 50 mW) that generates light having a wavelength of about 800 nm and modulates the intensity of the light with an optical shutter.

The laser beams 1404 and 1405 emitted from the laser light sources 1402 and 1403 are
6 and 1407, reflecting mirror groups 1408 and 1409
Is controlled so as to proceed in parallel with the direction in which is provided. Then, the laser beams 1404 and 1405 are reflected by each one of the reflection mirror groups 1408 and 1409 and travel in the first layer of the medium, and at the intersection 1410 as in the third embodiment. Change the optical response,
Display an image.

As a laser scanning mechanism, a group of reflection mirrors 1408 and 14 formed by micromachining are used.
09 is electrically controlled to determine whether each of the reflecting mirrors reflects the incident laser light 1404, 1405 in the direction of the first layer 1401 of the medium, or is located off the optical path. To be one of

Then, of the reflecting mirror group 1408, for example, the reflecting mirror closest to the reflecting mirror 1406 is installed and fixed on the optical path of the laser beam 1404, and
For example, the number of reflection mirrors that reflect the laser light 1405 selected from 09 is 1
By changing to the second, second,..., Each row can be scanned in order.

Further, after the scanning of one row is completed, the reflection mirror of the reflection mirror group 1408 which is closer to the reflection mirror 1406 next to the above-mentioned reflection mirror is set to the laser light 140.
The reflection mirror that reflects the laser light 1405, which is installed and fixed on the optical path of No. 4 and is selected from the reflection mirror group 1409, is counted, for example, from the side closer to the reflection mirror 1407.
By changing to the second..., Each row is scanned sequentially. This operation is repeated, and when scanning of all columns is completed, image display of the entire screen is completed, and this is continuously performed to realize moving image display. Note that laser light not absorbed in the first layer 1401 of the medium is absorbed by the optical traps 1411 and 1412.

Although the second and third layers are not shown,
Scanning may be performed similarly. The laser light source 140
Only devices for modulating the intensity of the light from 2,1403 by the optical shutter are provided separately for each layer, but the other devices may be common. That is, the laser light sources 1402, 14
03, the light is divided into three beams and intensity modulation is performed, and then the reflecting mirrors 1406 and 1406 having a width in the depth direction in FIG.
407 and the reflection mirror groups 1408 and 1409 may be commonly used in three layers.

As described above, according to the present embodiment, an image display device having higher plasticity and lighter weight can be realized.

The present invention is not limited to the above-described embodiment. For example, instead of CdSe, copper chloride I (CuCl), cadmium sulfide (CdS), S
i, Ge, indium arsenide (InAs), ZnSe, Z
It is also possible to use nS and ZnO. In particular,
Among them, CdSe, CuCl, CdS, ZnS
e, ZnS, and ZnO are preferable materials because energy obtained by two-photon absorption can be efficiently transferred to an organic material.

As the organic material, it is also possible to use polydiacetylene-based polymers other than the polydiacetylene listed in the above embodiment, polyacetylene, polythiophene, photochromic organic molecules and the like. In particular, polydiacetylene-based polymers, polythiophenes, and charge-transfer complexes change their optical response even with weak light irradiation, so that the efficiency of changing optical characteristics by photoexcitation can be greatly improved.

[0091]

As described above, according to the present invention, high brightness,
A display device with low power consumption can be provided.

[Brief description of the drawings]

FIG. 1 is a chemical formula of a molecule in which the main chain portion of polydiacetylene is (a) acetylene type and (b) butatriene type.

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

FIG. 3 is a schematic diagram illustrating components of a display device according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating an X-direction scanning mechanism of the display device according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a Y-direction scanning mechanism of the display device according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating an image forming unit of a display device according to a second embodiment of the present invention.

FIGS. 7A, 7B, and 7C are diagrams illustrating a method of creating an image forming unit of a display device according to a second embodiment of the present invention.

FIG. 8 is a diagram illustrating an operation of the display device according to the second embodiment of the present invention.

FIG. 9 is a diagram illustrating an application example of the display device according to the second embodiment of the present invention.

FIG. 10 is a diagram illustrating an operation of the display device according to the third embodiment of the present invention.

11 (a), (b) and (c) show the fourth embodiment of the present invention.
FIG. 5 is a diagram illustrating an operation of the display device of the embodiment.

FIG. 12 is a diagram illustrating a method for forming an image forming unit in a display device according to a fourth embodiment of the present invention.

FIG. 13 is a diagram illustrating a display device according to a fifth embodiment of the present invention.

FIG. 14 is a diagram illustrating a display device according to a sixth embodiment of the present invention.

FIG. 15 is a diagram showing a configuration of a conventional photoexcitation type fluorescent display.

FIG. 16 is a view for explaining a configuration of a conventional flat fluorescent display using two-photon absorption.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Image forming part 22 ... X direction addressing laser beam 23 ... Y direction addressing laser beam 24 ... Intersection of laser beam 31 ... X direction scanning mechanism 32 ... Y direction scanning mechanism 33 ... Mirror 34 ... Laser trap 41, 51 ... Laser diodes 42, 52 Optical shutters 43, 53 Convergent lens systems 44, 54 Condensing lens systems 45, 55 Mirrors 46, 56 Rotating polygon mirrors 47, 57 Correction lenses 48, 58 Planar light guide 49 59, parabolic mirror 61, light guide path 62, pixel 63, pixel to be rewritten 64, first reflector 65, second reflector 71, organic material 72, semiconductor ultrafine particles 73, taper 74, injection nozzle 91 ... Pillar 92. Image display device 101. Cyan panel 102. Magenta panel 103. Yellow panel 111. X Direction light guide path 112 Y direction light guide path 113 Organic material-semiconductor ultrafine particle dispersion layer 121 Dummy spacer 122 Injector 131 Curved surface 132 Laser light source 133 Beam splitter 134 Optical system 135 Rotating polygon mirror 136 Laser light from X direction 137 Laser light from Y direction 138 Image display units 161, 162 Laser light source 163, 164 Mirror 165 Body 166, 167 Laser light 168 Intersection 1401 First layer 1402, 1403 … Laser light source 1404, 1405… Laser light 1406, 1407… Reflection mirror 1408, 1409… Reflection mirror group 1410… Intersection point 1411, 1412… Optical trap

Claims (7)

[Claims] 1. A light source comprising one or more light sources, a control device for controlling light from the light source, and a medium for irradiating the light, wherein the light from two directions intersects to irradiate the medium. An image display device for changing an optical response around the intersection of the light in the medium. 2. The image display device according to claim 1, wherein wavelengths of the light from the two directions are different from each other. 3. The image display device according to claim 1, wherein the intersection is moved while fixing the angle at which the light intersects. 4. The medium according to claim 1, wherein the medium is at least one of organic materials including polydiacetylene, polythiophene and a charge transfer complex, and CdSe, CuCl, CdS, ZnSe, Z
2. The image display device according to claim 1, further comprising at least one of inorganic semiconductors composed of nS and ZnO. 5. The image display device according to claim 1, wherein a gradation expression is performed by controlling an amount of the light applied to the medium. 6. The image display device according to claim 1, wherein the medium is divided for each pixel. 7. A plurality of types of pixels are formed by using a plurality of types of media having different wavelengths of light whose optical response changes, and the plurality of types of pixels are arranged in a predetermined order. 7. The image display device according to 6.