JP2006030918A - Stereoscopic image display method and element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superior stereoscopic image display method and element which are free from variation in stereoscopic effect even a long period later. <P>SOLUTION: The stereoscopic image display method which has: a very small light source array; an image for stereoscopic image display; and observation light, is characterized in that the image for stereoscopic image display is made of color materials containing pigments or pigment precursors and the observation light is a light source (A) which is a white light source having <0.2 light emission intensity at 365 nm when light intensity at 620 nm is 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stereoscopic image display method and element, and more particularly, to a stereoscopic image display method and element excellent in stereoscopic effect after time.

  Various methods for stereoscopic display have been researched and developed in the past, and as a stereoscopic image display method, not only when the viewer's viewpoint moves in the horizontal direction, but also when it moves in the vertical direction, It is known that it is necessary to use an integral photography method, or a light reproduction method that is technically related to it. It is said that this integral photography requires a special lens called a fly-eye lens with a structure resembling an insect compound eye.

  On the other hand, instead of the fly-eye lens described above, by using a pinhole array created by printing on a transparent OHP sheet with an ink jet printer, only an easily available equipment such as an ink jet printer or a personal computer is used. It has also been proposed to perform three-dimensional display of the system (Non-patent Documents 1 and 2).

  A simple three-dimensional display method in which the integral photography fly-eye lens described in Non-Patent Document 1 is replaced with an inkjet pinhole array is used between two transparent OHP sheets printed with a pattern made by a personal computer. When a transparent thin plate is sandwiched and illuminated from the back, a stereoscopic image can be observed from the front. As a method of creating stereoscopic data, a method of ray tracing using a computer program and a method of controlling the position of a viewpoint using existing CG software (POV-Ray) have been proposed.

  One specific proposal is to sandwich a transparent plate with a thickness of about 1 mm between two OHP sheets. The upper OHP sheet has a pinhole array, and the lower OHP sheet has an original 3D image. Each pattern is printed, and when viewed from above with a backlight from below and viewed from above, stereoscopic viewing is possible.

  The principle of this method is similar to ray tracing used in pinhole cameras and computer graphics. The light emitted from the lower OHP sheet passes through the hole (pinhole) in the upper OHP sheet and reaches the viewpoint. The viewer feels as if the light is coming from an object that exists in a three-dimensional space and can be viewed stereoscopically.

  In this method, the method of creating a pattern to be printed on the OHP sheet is technically important, and the upper OHP sheet is a pinhole array by an ink jet method, and this is a very regular pattern, so it is easy to program by Pasoncon Can be generated.

  The stereoscopic display method described in Non-Patent Document 2 uses 3DCG software for a stereoscopic image display image obtained by 720 dpi output by an inkjet printer and a stereoscopic image display image obtained by 400 dpi output by a silver halide photographic printer. The principle of integral photography using this printing technology is described as follows based on FIG. 1.

  As shown in FIG. 1, a pinhole array is printed on the upper transparent sheet, and an IP image is printed on the lower transparent sheet, respectively, so that the distance between the two transparent sheets is kept constant. A transparent plate is inserted. In order to illuminate the IP image, a backlight (observation light) is placed under the IP image.

The observer sees the light that has passed through the pinhole array. At that time, it cannot be distinguished whether the light entering the right eye has come out from the point Q of the IP image or from S on the three-dimensional object. Similarly, it cannot be distinguished whether the light entering the left eye has come out from the point R of the IP image or from S on the three-dimensional object. Therefore, the binocular parallax makes it appear as if there is an object at the point S. The pinhole array may be exchanged for a stereoscopic image display image in FIG. 1, and if the backlight (observation light) uses reflected light instead of transmitted light, the observer side There may be.
3D moving image display by light beam reproduction method, 3D Image Conference 2001, pp. 173-176, 2001 Synthesis of Integral Photography Images by Shade (TM), 3D Image Conference 2004, pp. 173, 2004

The present inventor conducted research on the above prior art and found that in the case of a stereoscopic image display image using a color sensitive material having a dye or a dye precursor, the stereoscopic effect may be impaired over time. .
An object of the present invention is to provide an excellent stereoscopic image display method and element in which the stereoscopic effect does not change even after a long period of time.

The present invention for solving the above problems has the following configuration.
1. In a stereoscopic image display method having a micro light source array, a stereoscopic image display image and observation light, the stereoscopic image display image is formed of a color material containing a dye or a dye precursor, and the observation light is a light source described below. A stereoscopic image display method characterized by being (A).
[Light source (A)] A white light source having an emission intensity at 365 nm of less than 0.2 when the emission intensity at 620 nm is 1.

2. 2. The stereoscopic image display method as described in 1 above, wherein the observation light is the following light source (B).
[Light source (B)] A white light source having an emission intensity at 365 nm of less than 0.1 when the emission intensity at 620 nm is 1.

3. 2. The stereoscopic image display method according to 1 above, wherein the observation light is the following light source (C).
[Light source (C)] A white light source that exhibits a white color by containing a light source having a wavelength longer than 370 nm and light obtained by converting the wavelength of the emitted light with a fluorescent material.

4). 2. The stereoscopic image display method according to 1 above, wherein the observation light is the following light source (D).
[Light source (D)] A white light source that does not use mercury emission line emission of mercury as a light source for wavelength conversion of a fluorescent material.

5. 2. The stereoscopic image display method according to 1 above, wherein the observation light is the following light source (E).
[Light source (E)] A white light source which is the light source (C) or the light source (D) and has at least two kinds of wavelength-converting fluorescent materials, and the light emission source thereof has a shorter wavelength than 400 nm.

6). 6. The stereoscopic image display method according to any one of 1 to 5, wherein the micro light source array is a pinhole array.

7). 6. The stereoscopic image display method according to any one of 1 to 5, wherein the minute light source array is a fly-eye lens.

8). 8. The three-dimensional image display method according to 7, wherein the fly-eye lens is a light condensing element formed in a convex lens shape by printing.

9. 9. The three-dimensional image display method as described in any one of 1 to 8 above, wherein the color material is a silver halide photographic light-sensitive material, an optical recording material, or a heat-sensitive recording material.

10. 10. The stereoscopic image display method according to any one of 1 to 9, wherein the stereoscopic image display image is created by digital output at a resolution of 300 to 4000 dpi.

11. 11. The stereoscopic image display method according to any one of the above 1 to 10, wherein the stereoscopic image display image uses a plurality of rendering images with different viewpoints by 3DCG software in the image data creation step.

12 11. The stereoscopic image display method according to any one of 1 to 10, wherein the stereoscopic image display image uses a plurality of rendering images with different viewpoints by CAD software in the image data creation step.

13. In the stereoscopic image display element used in the stereoscopic image display method according to any one of 1 to 12, the stereoscopic image display image is formed of a color material containing a dye or a dye precursor, and the observation light is A stereoscopic image display element characterized by being any one of the light sources (A) to (E).

  In the present invention, the “stereoscopic image display image” does not include a so-called moving image image, and refers to a stereoscopic still image display image. However, it is a plurality of still images, and a pseudo moving image is generated when an observer moves. As shown in FIG. 4, a stereoscopic image display image for obtaining a pseudo moving image is included.

According to the inventions described in claims 1 to 5 and 13, since a stereoscopic image display image formed of a color material containing a dye or a dye precursor is used, the natural color image reproducibility is excellent. Since specific observation light is used, the effect of excellent stereoscopic effect over time is exhibited.
According to the invention described in claim 6, the pinhole array can be formed with the color material containing the dye or the dye precursor together with the stereoscopic image display image.
According to the seventh aspect of the present invention, the reproducibility of a high-quality stereoscopic still image can be obtained.
According to the invention described in claim 8, the fly-eye lens can be formed by an inexpensive printing method.

According to the invention described in claim 9, a general-purpose color material can be used as the photographic material.
According to the invention described in claim 10, a high-resolution stereoscopic still image can be obtained.
According to the eleventh aspect of the present invention, the reproducibility of a high-quality stereoscopic still image can be obtained by using known 3DCG software.
According to the twelfth aspect of the present invention, the reproducibility of a high-quality stereoscopic still image can be obtained by known CAD software.

The present invention will be described below.
In the present invention, a stereoscopic image display image is formed of a color material containing a dye or a dye precursor. When the micro light source array is a pinhole array, it may be formed of a color material containing a dye or a dye precursor, may be formed by an ink jet method, or may be formed by a printing method. Any of the known methods may be used.
First, the case where the micro light source array is a pinhole array will be described.

Examples of the color material include the following.
First, a silver halide color photographic light-sensitive material is exemplified. As the photosensitive material, any known material may be used as long as it has at least three kinds of photosensitive layers having different absorption wavelength regions from each other on a light transmissive support or a reflective support. It is preferably a transmitted light observation type silver halide color photographic light-sensitive material on which an image is formed on a light-transmitting support.

  The silver halide light-sensitive material used in the present invention may be a color negative film for photography or a color positive film, and may be either a printing paper for printing or a transmission printing film for display. One preferred embodiment of the silver halide light-sensitive material that can be used in the present invention is a large-size color positive film. Another aspect is a color film for creating a transmissive display, and a display film suitable for digital exposure is particularly preferable.

The composition of the silver halide emulsion that can be used in the present invention has an arbitrary halogen composition such as silver chloride, silver bromide, silver chlorobromide, silver iodobromide, silver chloroiodobromide, and silver chloroiodide. It may be.
For example, it may be a silver iodobromide emulsion mainly used for a photographic material. Further, it may be a silver chlorobromide emulsion containing 95 mol% or more of silver chloride used for a printing light-sensitive material, and is particularly preferably an emulsion that is optimal for digital exposure with improved high illumination exposure suitability.

The color material used in the present invention is not limited to the above, and any known material may be used as long as it is a recording material containing a dye or a dye precursor. For example, an optical recording material capable of obtaining a high-quality color image by an azomethine dye by a simple dry treatment can be mentioned. Specifically, a microcapsule enclosing a dye precursor of an azomethine dye having a specific structure; And an optical recording material in which an oil droplet containing a photopolymerization initiator and a polymerizable electrophile and a photosensitive layer containing a binder are provided on a transparent support. And what a photoinitiator is a cationic pigment | dye / anionic boron compound complex is mentioned as a preferable example.

  This image forming method using an optical recording material comprises a transparent support, a microcapsule encapsulating a dye precursor, oil droplets containing a polymerizable electrophile and a photopolymerization initiator, and a photosensitive layer containing a binder. The image is exposed imagewise, radicals are generated from the exposed photopolymerization initiator, the radicals are added to the polymerizable electrophile to initiate polymerization, and the polymerizable electrophile is image-immobilized. To do. Thereafter, the unpolymerized electrophile and the dye precursor are brought into contact and reacted by heating to obtain a dye image.

  Examples of the dye precursor used for this are listed in paragraphs [0006] to [0047] of JP-A No. 2001-13680, and can also be used in the present invention. And the description of paragraph number [0052]-[0074] can be referred similarly about the microencapsulation of a dye precursor, a polymerizable electrophile, a photoinitiator, an oil droplet, etc.

  This optical recording material combines a plurality of photopolymerization initiators having different photosensitive wavelengths and a plurality of dye precursors having different colors to form a multicolor or full-color image. For example, it is possible to obtain an optical recording material for full-color image formation by laminating three photosensitive layers that develop colors of cyan, magenta, and yellow, respectively, and have different photosensitive wavelengths. An intermediate layer may be provided between the respective layers, and a protective layer, a filter layer, and the like may be provided.

  When selecting an exposure light source, of course, a light source suitable for the photosensitive wavelength of the optical recording material is selected, but whether the image information passes through an electrical signal, the overall processing speed, compactness, power consumption, etc. You can choose in consideration.

  When recording image information via an electrical signal, a light emitting diode or various lasers may be used as the image exposure device, or various devices known as image display devices (CRT, liquid crystal display, projector). A troluminescence display, an electrochromic display, a plasma display, or the like can also be used. In this case, the image information includes an image signal obtained from a video camera or an electronic still camera, a television signal typified by the Nippon Television Signal Standard (NTSC), and an image signal obtained by dividing an original image into a large number of pixels by a scanner or the like. In addition, image signals stored in recording materials such as magnetic tapes and disks can be used.

  When exposing color images, LEDs, lasers, fluorescent tubes, etc. are used in combination in accordance with the color sensitivity of the optical recording material, but the same may be used in combination, or different types may be used in combination. Good. The color sensitivity of optical recording materials is usually R (red), G (green), and B (blue) photosensitivity in the photographic field, but in recent years, they are often used in combination with UV, IR, etc. The range is expanding. For example, the color sensitivity of the optical recording material is (G, R, IR), (R, IR (short wave), IR (long wave)), (UV (short wave), UV (medium wave), UV (long wave). ), (UV, B, G) and other spectral regions are used. The light source may also be a combination of different types such as a combination of two LED colors and a laser. The arc tube or element may be scanned and exposed using a single tube or element for each color, or an array in order to increase the exposure speed. Available arrays include LED arrays, liquid crystal shutter arrays, magneto-optical element shutter arrays, and the like.

  Further, a blue light-emitting diode that has recently made remarkable progress, and a light source combined with a green light-emitting diode and a red light-emitting diode can be used.

  As the image display device, there are a color display device and a monochrome display device such as a CRT, and a method of performing exposure several times by combining a monochrome display device with a filter may be adopted. An existing two-dimensional image display device may be used in a one-dimensional manner like FOT, or may be used in combination with scanning by dividing one screen into several. As the heating means, as in the optical recording material described in JP-A-61-294434, a heating element layer may be provided on the surface of the support on which the photosensitive layer of the optical recording material is not coated. Good. Further, a hot plate, an iron and a hot roller are used as described in JP-A-61-147244, or an optical recording material is sandwiched between the heat roller and a belt as described in JP-A-62-144166. You may use the method of heating by.

  That is, the optical recording material may be brought into contact with a heating element having a surface area equal to or larger than the area of the optical recording material, and the entire surface may be heated simultaneously, or a heating element having a smaller surface area (hot plate, heating roller, heating drum, etc. And the entire surface may be heated over time. In addition to the heating method in which the heating element and the optical recording material are in direct contact as described above, the non-contact state can be heated by applying electromagnetic waves, infrared rays, hot air, or the like to the optical recording material. In the image forming method of the present invention, when the optical recording material is heated from the surface on which the photosensitive layer is not coated, the surface on which the photosensitive layer is coated is in direct contact with air. However, in order to prevent moisture and volatile components from evaporating from the optical recording material and to keep the heat from escaping, it may be covered with a heat insulating material or the like.

  The heating is preferably performed after 0.1 second or more has passed after imagewise exposure. The heating temperature is generally 60 ° C. to 250 ° C., preferably 80 ° C. to 180 ° C., and the heating time is between 0.1 seconds and 5 minutes. Moreover, you may heat twice or more at different temperature.

Next, the heat-sensitive recording material used in the present invention will be described.
The heat-sensitive recording material may be any known heat-sensitive recording material containing a dye or a dye precursor. For example, a first thermosensitive coloring layer containing an electron donating dye precursor and an electron accepting compound as main components on a transparent support, a diazonium salt compound having a maximum absorption wavelength of 360 ± 20 nm, the diazonium salt compound and heat A second thermosensitive color-developing layer containing a coupler which develops color upon reaction, a third containing a diazonium salt compound having a maximum absorption wavelength of 400 ± 20 nm, and a coupler which reacts with the diazonium salt compound to develop color A multicolor thermosensitive recording material that is formed by sequentially laminating thermosensitive color-developing layers is disclosed. Japanese Patent Publication No. 49-69 creates a thermosensitive recording material in which a plurality of electron-donating dye precursors and an electron-accepting compound coexist. An attempt was made to obtain images of different hues by applying different temperatures by utilizing the different color development start temperatures of the electron donating dye precursors. In 27708 and JP-B-51-5792, two layers of heat-sensitive recording layers that develop colors in different hues are laminated, and the upper layer is colored at low temperatures, and both the upper and lower layers are colored at high temperatures. An attempt to obtain a material was proposed. In Japanese Patent Publication No. 51-5791, a first thermosensitive coloring layer comprising a diazonium salt compound and a coupler, an intermediate layer containing a polyether compound, a basic dye precursor, A multicolor heat-sensitive recording material in which a second heat-sensitive color-developing layer composed of an electron acceptor and an electron-accepting compound is laminated has been proposed. Japanese Patent Publication No. 51-29024 discloses a heat-sensitive material composed of a basic dye precursor and an electron-accepting compound. In a two-color thermosensitive recording material in which two color-developing layers are laminated, a method in which guanidines, which are organic base compounds, are added to the low-temperature color-developing layer, and the color development of the low-temperature color-developing layer is erased when the high-temperature color-developing layer is colored Further, in Japanese Patent Publication No. 51-37542, a high temperature thermosensitive coloring layer composed of an acidic dye precursor and an organic base compound and a low temperature coloring layer composed of a basic dye precursor and an electron accepting compound are laminated on a transparent support. There has been proposed a multicolor heat-sensitive recording material in which the organic base compound in the lower layer diffuses into the upper layer and erases the color former during high-temperature printing.

  As one of the methods for reproducing a full-color image by direct thermal recording, a thermal recording layer 2 in which two diazonium salts having different photosensitive wavelengths and couplers that react with each of the diazonium salts and develop colors in different hues upon heating are combined. There is also known a heat-sensitive recording material that can reproduce a good multicolor image by laminating a layer and a heat-sensitive recording layer combining a basic dye precursor and an electron-accepting compound, and any of the above can be used in the present invention. It is.

The production of the pinhole array is preferably made of the color material, but is not limited to this, and any known method such as black and white silver halide photographic light-sensitive material, ink jet, or printing may be used.
The preferred pinhole array of the present invention preferably uses a color photosensitive material or heat-sensitive recording material as described above, and preferably has a black pinhole aperture ratio of 2 to 15%, particularly 2 to 10%, and a pinhole maximum density of 2.5 or more. In particular, exposure and development are performed by a conventional method so as to be 3.0 or more.

  In the stereoscopic image display element according to the present invention, the pinhole array and the stereoscopic image display image may be formed on the same transparent support (including a colored transparent support, the same shall apply hereinafter), They may be provided opposite to each other on the front and back surfaces of separate transparent supports. In the former case, it is necessary to stack the two images when observing the three-dimensional image. In this case, it is possible to stack the two members without the pinhole array of the support and the three-dimensional image display image so that the distance between the two images is increased. preferable. On the other hand, in the latter case, the transparent support preferably has a thickness of 1 mm to 10 mm, particularly 2 mm to 5 mm so that the distance between the two is separated.

Also for the transparent support used in the former example, a combination of transparent supports having such a thickness that the above separation distance can be obtained is used.
In the case of this former example, the preferred pinhole array and stereoscopic image display image of the present invention may be formed of the same type of color photosensitive material, or formed of different types of color photosensitive material (for example, pinhole array). May be made of a heat-sensitive recording material, and a stereoscopic image display image may be made of a silver halide color photographic light-sensitive material.

In the case of the latter example, it is preferably formed of the same type of color photosensitive material. For example, a silver halide photosensitive layer for pinhole array formation is coated on the surface side of the transparent support having the above thickness. In this case, a silver halide photosensitive layer for image formation for stereoscopic image display is coated on the back side.
In this case, the formation of the pinhole array and the formation of the stereoscopic image display image have an advantage that the image formation and the arithmetic processing can proceed in parallel.

The pinhole array is preferably in the form of a grid, for example, configured by 240 units × 240 units, and further, one unit has a configuration of 64 pixels × 64 pixels, and the aperture ratio of the pinhole is unexposed in one unit of 64 pixels. A pinhole array having an aperture ratio of 11.8% and a maximum density of 2.5 can be obtained by adjusting the size of the transparent pixel area and securing a transparent pixel area of 22 pixels × 22 pixels.
Here, the maximum density refers to the maximum value of visual density obtained by measuring the black region with X-Rite.

  A method of creating a stereoscopic image display image may be a ray tracing method using a specific computer program, but a known technique such as a method using a commercially available CG application may be employed. In particular, in the present invention, the stereoscopic image display image uses a plurality of rendering images with different viewpoints by 3DCG software in the image data creation step, or the stereoscopic image display image is in the image data creation step. A plurality of rendering images with different viewpoints by CAD software can be used.

  A plurality of rendering images with different viewpoints created as described above can be combined and rearranged by an arbitrary method to form a stereoscopic image display image. For example, the method described in Non-Patent Document 2 is preferable.

  Arbitrary software can be used for 3DCG software in the present invention. Examples of software that is easily available on the market and that is preferable in terms of quality include shade, Maya, 3D studio max, soft image, light wave 3D, and cinema 4D.

  The transparent support in the present invention is not particularly limited as long as it has transparency in the visible light region, and those known in the photographic industry can be adopted. The transparent support need not be a single layer and may be a laminate.

The micro light source array of the present invention is not limited to the pinhole array described above.
Next, the case where the micro light source array is a fly-eye lens will be described.
As the fly-eye lens, a known one can be used without any particular limitation. For example, Japanese Patent No. 3488179 discloses that a plurality of convex lens-shaped condensing elements (fly-eye lens) patterns are formed by using a non-colored or colored transparent ink, and can be employed in the present invention. . This fly-eye lens may be configured to mix two or more kinds of light condensing elements having different sizes as required. Further, the fly-eye lens has an advantage that it can be formed by using a printing method as disclosed in the above-mentioned Japanese Patent No. 3488179. The case where it manufactures especially by a screen printing method is preferable.

Next, the observation light of the present invention will be described.
The observation light of the present invention is a white light source including the following light sources (A) to (E).
In particular,
[Light source (A)] A white light source having an emission intensity at 365 nm of less than 0.2 when the emission intensity at 620 nm is 1.
[Light source (B)] A white light source having an emission intensity at 365 nm of less than 0.1 when the emission intensity at 620 nm is 1.
[Light source (C)] A white light source that exhibits a white color by containing a light source having a wavelength longer than 370 nm and light obtained by converting the wavelength of the emitted light with a fluorescent material.
[Light source (D)] A white light source that does not use mercury emission line emission of mercury as a light source for wavelength conversion of a fluorescent material.
[Light source (E)] A white light source which is the light source (C) or the light source (D) and has at least two kinds of wavelength-converting fluorescent materials, and the light emission source has a short wave shorter than 400 nm.
Any of these may be used.

Specifically, white light is obtained by color mixing of light, and is a mixture of blue light emitted from an InGaN-based LED having a wavelength of 450 to 550 nm, which is a light source, and yellow light emitted from a phosphor. As a phosphor suitable for such a white LED, for example,
Composition formula: (Y, Gd) ₃ (Al, Ga) ₃ O ₁₂
A phosphor in which Ce is doped into a YAG-based oxide represented by the following is most often used. This phosphor is thinly coated on the surface of an InGaN blue LED chip, which is a light source, and emits white light. Such a white light source may be used in the present invention.

  Next, in the present invention, for example, a light emitting device having a light emission wavelength in the range of 360 nm to 550 nm and an oxynitride phosphor in which a rare earth element is activated, a part of the light of the light emitting device is A white light source that is wavelength-converted and emitted by a phosphor may be used, and an emission wavelength of the light-emitting element is in a range of 450 nm to 550 nm. In addition to the light converted by the wavelength and the light of the light-emitting element. It is preferable to emit white light by being mixed with a part of the oxynitride, and the oxynitride is preferably an oxynitride having alpha sialon as a base material.

And the phosphor is
Formula _{Me x Si 12- (m + n} ) Al (m + n) O n N 16-n: Re1 y Re2 z
A part or all of a metal Me (Me is Li, Ca, Mg, Y, or one or more of lanthanide metals excluding La and Ce) dissolved in alpha sialon is Lanthanide metal Re1 (Re1 is one or more of Ce, Pr, Eu, Tb, Yb, or Er) or lanthanide metal Re1 and a lanthanide metal Re2 as a co-activator (Re2 is Dy) Preferably it consists of:

A white LED having this structure is preferable because of its excellent high-quality stereoscopic image color reproducibility.
The white light source as the observation light used in the present invention is commercially available and is also available from the market. For example, the ultraviolet LED is known as TG Purple of Toyoda Gosei Co., Ltd. The white LED has been marketed by the company as a high brightness white LED “TG TRUE White Hi”, and these can also be used in the present invention.

The following examples illustrate the invention.
Example 1
A stereoscopic display (stereoscopic image display image) using the integral photography image (hereinafter referred to as “IP image”) of the present invention was prepared as follows.

<< Creation of IP image >>
3D shape data to be a sample image was created with 3DCG software Shade 6 advance of eFrontier Co., Ltd., and the camera position was controlled to create a rendering image group with the following different viewpoints.

The image pattern is composed of a total of 1024 viewpoints existing on a matrix of equal intervals of 32 viewpoints in the horizontal direction and 32 viewpoints in the vertical direction with the gazing point as the center. The rendering image size of each viewpoint image is 360 pixels × 360. Formed with pixels.
This image group was rearranged and synthesized by the method described in Non-Patent Document 2 to create IP image data.

  The above IP image data is exposed to a 5 × 7 inch silver salt color positive film sheet, which is a silver halide color photographic light-sensitive material, with a resolution of 2032 dpi using a Kodak digital exposure machine LVT printer, and so-called E6 processing. Color development processing was performed. The color IP image thus obtained is designated IP-1.

  Similarly, the above-mentioned IP image data is exposed to Konica Minolta Display Film Clear ForDIGITAL Type D1, which is a 75 cm sized silver salt color display film, with a resolution of 400 dpi using a digital exposure machine lambda manufactured by Durst. Color development processing was performed. The color IP image thus obtained is designated IP-2.

《Creating a pinhole image》
In Adobe Photoshop ver6, the pinhole array was composed of 360 units × 360 units, and further, image data having a unit of 32 pixels × 32 pixels was created. Of these, 10 pixels × 10 pixels per unit were defined as pinholes, and the pinhole aperture ratio was 9.8%.
The above pinhole image data was exposed to a 5 × 7 inch silver salt color positive film sheet at a resolution of 2032 dpi with a Kodak digital exposure machine LVT printer, and color development processing was performed by so-called E6 processing. The pinhole image obtained in this way is represented by P-1.

  Similarly, the above-mentioned pinhole image data is exposed to Konica Minolta Display Film Clear ForDIGITAL Type D1, which is a 75 cm sized silver salt color display film, with a resolution of 400 dpi using a digital exposure machine lambda manufactured by Durst. Then, color development processing was performed. The pinhole image thus obtained is designated as P-2.

<Creation of fly-eye lens array>
Create a convex lens group with a diameter of 1.98 mm on a transparent PET film with a thickness of 210 μm and a 75 cm square size using a UV curable type transparent ink and screen printing to create a square arrangement with a spacing of 2.03 mm. did. The focal length of the lens was about 5 mm. The fly-eye lens array thus obtained is designated as F-1.

<< Creation of 3D display sample >>
The color IP image obtained by the above-described method was bonded to the non-image forming film (support) between IP-1 and the pinhole image P-1. Since each image was formed on a 210 μm thick film, the IP image and the pinhole image were placed at a distance of about 420 μm. The stereoscopic display sample thus obtained is designated as 3D-1.

The color IP image IP-2 and the pinhole image P-2 were bonded to each other between the non-image forming side films (supports) via an acrylic plate having a thickness of 5 mm. The stereoscopic display sample thus obtained is designated as 3D-2.
The IP-2 color image and the fly-eye lens array F-1 were bonded to each other between the films (supports) via an acrylic plate having a thickness of 5 mm. The stereoscopic display sample thus obtained is designated as 3D-3.

<< Creating a backlight >>
A backlight was created with the following white light source.

  No. 3 and 4 show Toyoda Gosei white LEDs. Here, λ365nm / λ620nm indicates the relative value of the emission intensity at 365nm with respect to the emission intensity at 620nm obtained from the spectral measurement values of 360nm to 800nm of each white light source. Further, the light emission source indicates the wavelength of the emission line spectrum that is assumed to be the light emission source that is present on the shortest wavelength side in the measurement spectrum of 360 nm to 800 nm of each white light source and excites the fluorescent material.

Three-dimensional display samples 3D-1 to 3D-3 were combined with backlights 1 to 4, respectively, to produce displays 1 to 12.
These 3D displays were stored for 1 month in an environment with a temperature of 55 ° C. and a humidity of 70% with the backlight on. The sensory evaluation of the stereoscopic effect was performed by the following method after storage.

  As shown in FIG. 2, the three-dimensional image display image used in the present embodiment is such that three trees (2), (3), and (4) are distant from the foreground. The white cloud (5) appears in the far right of the farthest tree (4), and the farthest view in the sky (6) under clear sky.

The evaluation of the three-dimensional effect was based on the average value of the five-stage visual evaluation (10 persons) of the image designation part according to the following criteria.
5 points: The details of white clouds (5) and trees (4) can be perceived.
4 points: The stereoscopic effect of blue sky (6) and white cloud (5) can be perceived.
3 points: The three-dimensional effect of blue sky (6) and tree (4) can be perceived.
2 points: The three-dimensional effect of the blue sky (6) and the tree (1) can be perceived.
1 point: The stereoscopic effect on the entire screen cannot be perceived.

  As is apparent from Table 2, it can be seen that the backlights 3 and 4 have the effects of the present invention, and 4 is particularly preferable.

Principle diagram of integral photography using printing technology Front view of stereoscopic image display image used in the example

Claims (13)

In a stereoscopic image display method having a micro light source array, a stereoscopic image display image and observation light, the stereoscopic image display image is formed of a color material containing a dye or a dye precursor, and the observation light is a light source described below. A stereoscopic image display method characterized by being (A).
[Light source (A)] A white light source having an emission intensity at 365 nm of less than 0.2 when the emission intensity at 620 nm is 1. The stereoscopic image display method according to claim 1, wherein the observation light is the following light source (B).
[Light source (B)] A white light source having an emission intensity at 365 nm of less than 0.1 when the emission intensity at 620 nm is 1. The stereoscopic image display method according to claim 1, wherein the observation light is the following light source (C).
[Light source (C)] A white light source that exhibits a white color by containing a light source having a wavelength longer than 370 nm and light obtained by converting the wavelength of the emitted light with a fluorescent material. The stereoscopic image display method according to claim 1, wherein the observation light is the following light source (D).
[Light source (D)] A white light source that does not use mercury emission line emission of mercury as a light source for wavelength conversion of a fluorescent material. The stereoscopic image display method according to claim 1, wherein the observation light is the following light source (E).
[Light source (E)] A white light source which is the light source (C) or the light source (D) and has at least two kinds of wavelength-converting fluorescent materials, and the light emission source thereof has a shorter wavelength than 400 nm. The stereoscopic image display method according to claim 1, wherein the minute light source array is a pinhole array. The stereoscopic image display method according to claim 1, wherein the minute light source array is a fly-eye lens. The stereoscopic image display method according to claim 7, wherein the fly-eye lens is a light condensing element formed into a convex lens shape by printing. The three-dimensional image display method according to claim 1, wherein the color material is a silver halide photographic light-sensitive material, an optical recording material, or a heat-sensitive recording material. The stereoscopic image display method according to claim 1, wherein the stereoscopic image display image is created by digital output at a resolution of 300 to 4000 dpi. The stereoscopic image display method according to claim 1, wherein the stereoscopic image display image uses a plurality of rendering images with different viewpoints by 3DCG software in the image data creation step. The stereoscopic image display method according to claim 1, wherein the stereoscopic image display image uses a plurality of rendering images with different viewpoints by CAD software in the image data creation step. The stereoscopic image display element used in the stereoscopic image display method according to any one of claims 1 to 12, wherein the stereoscopic image display image is formed of a color material containing a dye or a dye precursor, and the observation light Is any one of the light sources (A) to (E).

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