JPS582506B2 - Gazouhiyoujisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display device that displays an image of a subject on a large screen in real time.

As an image display device that displays a large screen in real time that has been proposed so far, the number of modulated and deflected scans W ~ 10
Laser television projects a laser beam of several watts directly onto a screen and observes the reflected light from the screen. Schlieren optics illuminates an oil film with a modulated, deflected and scanned electron beam and observes the deformation of the oil film that occurs in response to the signal. There is an ``Idophor'' system that projects images onto a screen, as well as large CRT televisions.

However, each of these has drawbacks and cannot be said to be easy to use.

In other words, in laser televisions, the laser output is several watts to 10
Several W is required, and an input of 30 to 70 KW is required to obtain this much visible light laser output.Furthermore, since the laser light is coherent light, the light reflected from the screen is completely diffused light. There are drawbacks such as the image flickering and being difficult to see.

In addition, in Idophor, which projects the deformation of an oil film using a schlieren optical system to obtain a large screen, it is necessary to place the oil film, cathode, polarizing plate, etc. in a vacuum device and maintain a high vacuum.

In particular, oil films generate various organic gases, and have the disadvantage that the oil film itself decomposes or the emitted gas destroys the cathode, significantly reducing electron emission ability and shortening its life.

Furthermore, since it is technically impossible to make large cathode ray tubes themselves, the screen size is naturally limited to 1 m2 or less, and it is difficult to obtain larger images.

An object of the present invention is to provide a new large screen display device that eliminates the drawbacks of various conventional image display devices.

According to this invention, there is provided a photosensitive plate made of a substance that undergoes photoisomerization when irradiated with light, and a photosensitive plate that is modulated in accordance with an external signal.
A laser light source that irradiates polarized light to generate isomers of a substance, a visible light source that irradiates a photosensitive plate in various ways to display an image, and forms and projects the visible light that passes through the photosensitive plate. An image display device including a Schlieren optical system is obtained.

Next, the principle of this invention will be explained.

The central point of this invention is to utilize the geometric isomerism of substances and to generate other isomers by light irradiation.

When a substance with geometric isomerism is irradiated with sufficient light energy to photoisomerize, it changes from one structural isomer to another.

These two isomers have different refractive indices.

In other words, when a photosensitive plate filled with a geometrically isomer material such as a cell is irradiated with ultraviolet light to locally create a different type of isomer material, the refractive index of the isomer will be the same as the refractive index of the original isomer. Differently, it is possible to obtain a refractive index according to the signal of the irradiated light.

This local difference in refractive index is detected by uniformly illuminating the photosensitive plate with another visible light beam, forming an image using a Schlieren optical system, and projecting the image to obtain a large screen image.

It is well known that there are cis and trans structures as geometric isomers of organic materials.

Although these molecules have the same molecular formula, their physical or chemical properties differ due to their different three-dimensional structures.

The molecular extinction coefficients of the cis and trans structures are different, so when the cis structure isomer is irradiated with light with sufficient energy to cause photoisomerization, it changes to the trans structure isomer, and the trans structure isomer absorbs light and emits light. When irradiated with isomerizing light, it reversibly changes to a cis structural isomer and returns to its original substance.

As an example, FIG. 1 shows the molecular absorption characteristics of stilbene, and FIG. 2 shows the molecular absorption characteristics of azobenzene.

As can be seen from Figure 2, when trans-azobenzene is irradiated with light of approximately 325 mμ, it absorbs the light and turns into cis-azobenzene.
When irradiated with μ light, it returns to transbenzene.

Such changes change the refractive index. In the opposite case, the amount of change to the cis or trans structure is small because the light absorption is small.

Therefore, a desired photosensitive plate can be obtained by melting these substances and putting them into a cell, or by adding a binder and applying the mixture to a glass plate, film, etc.

Next, a preferred embodiment of the image display device of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a photosensitive plate containing a substance that is photoisomerized into other isomers by irradiation with ultraviolet light or the like, such as azobenzene.

Currently, ultraviolet laser equipment (e.g. He-Cd+laser 325
0 Å) 2 is modulated by an optical modulator 3,
The first deflector 4 deflects horizontally, and the second deflector 5 deflects vertically.

A dielectric multilayer film is deposited on the reflecting mirror 7 so that it reflects only ultraviolet laser light and transmits visible light.

The modulated and deflected laser beam passes through a lens 6, is reflected by a reflecting mirror 7, and is focused onto a photosensitive plate 1.

The substance inside the photosensitive plate 1 absorbs the modulated ultraviolet laser light,
Cis-sazobenzene is produced at the position hit by the laser beam, and the original trans-azobenzene remains in the area not hit by the laser beam.

Since the ultraviolet laser beam is modulated and deflected, the photosensitive plate 1
Cis-sazobenzene is generated locally one after another in the substance inside.

Then, a spatial distribution of refractive index is obtained.

The thus produced cis-azobenzene absorbs the relatively short wavelength light of 442 mμ in the light emitted by the light source 11 which also serves as the light source for the imaging/projection diagram, and returns to the original trans-azobenzene.

The light source 11 is a visible light source such as a Xe arc lamp,
The lens 10 has a lattice-shaped light shielding plate 9 in front of the condensing lens 10, and only the light that passes through the gap advances.

The lens 8 transfers the image of the lattice-shaped light-shielding plate 9 to the second lattice-shaped light-shielding plate 1.
This is a lens for forming an image on 2.

When the photosensitive plate 1 is not irradiated with ultraviolet light, the light shielding plate 1
2 blocks the light from the light source 11, so the screen 1
4 is dark.

When the photosensitive plate 1 is irradiated with ultraviolet light to form cis-azobezene and the refractive index of that part changes, the light from the light source 11 is refracted at that part and passes through the second lattice-shaped light-shielding plate 12.

Therefore, the local refractive index distribution on the photosensitive plate 1 is projected onto the screen 14 by the lens 13 as a bright and dark image.

The cis-sazobenzene on the photosensitive plate 1 is 442 out of the light source 11.
Since it absorbs mμ light and returns to the original transazobenzene, a real-time image can be obtained by deflecting the ultraviolet laser light modulated according to the signal.

The ultraviolet laser of the present invention may be a small one with an output of about several mW, and the light source 11 may be a Xe arc lamp or the like instead of a laser, so it is economical as it requires less electrical input.

Further, the photosensitive plate 1 does not need to be in a vacuum, and can be easily manufactured by filling cells with isomers or by fixing them to glass or the like.

Further, the substance may be a solid, liquid, or gas having geometric isomerism as long as it is homogeneous.

Since the image can be enlarged arbitrarily using an optical system, a large-sized image display device can be easily obtained.

The above-described embodiment of the present invention is merely an example, and it goes without saying that the present invention can be implemented by making various changes to the schlieren optical system and the method of irradiation with ultraviolet laser light.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are diagrams showing the molecular absorption characteristics of stilbene and azobenzene isomers, respectively, and FIG. 3 is a schematic diagram of an embodiment of the present invention. In the figure, 1 is a photosensitive plate, 2 is an ultraviolet laser, 3 is an optical modulator, 4 is a first deflector that scans in the horizontal direction, 5 is a second deflector that scans in the vertical direction, and 6 is on the photosensitive plate. 7 is a dielectric multilayer mirror that reflects ultraviolet laser light and transmits other visible light; 8 and 13 are lenses for imaging; 9 and 12 are lattice-shaped light-shielding plates; 10 is a condenser lens, and 11 is a Xe light source.

Claims (1)

[Claims] 1. A photosensitive plate made of a substance that undergoes photoisomerization when irradiated with light; a laser light source for generating isomers of the substance by illuminating the photosensitive plate with light modulated and deflected according to an external signal; An image display device comprising: a visible light source that uniformly illuminates a photosensitive plate to display an image; and a Schlieren optical system that forms and projects visible light that has passed through the photosensitive plate.