JP2004219900A - Screen, optical film, glasses, and manufacturing method of screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a transmission type screen improvable in contrast without complex constitution. <P>SOLUTION: The screen 1 is constituted by sequentially arranging, in the traveling direction of image light L, a Fresnel lens 11, a selective transmission film 13 that transmits mainly the light in the wavelength range of the image light L, an absorbing layer 14 that absorbs 50 to 70% of the visible light wavelength region, and a diffusing layer 15. The selective transmission film 13 is an optical multi-layer film formed by alternately laminating a high refractive index layer and a low refractive index layer, and has also a structure holding a spacer layer consisting of the high refractive index layer between the reflecting mirrors consisting of the alternating layer of the high refractive index layer and the low refractive index layer. The optical film thickness ND of the spacer layer is set so as to satisfy ND = (n±1/2)λ, or ND = nλ, to the wavelength λ to be transmitted. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmissive screen capable of displaying a high-contrast image, a method of manufacturing the same, an optical film effective for the screen, and eyeglasses coated with the optical film.
[0002]
[Prior art]
2. Description of the Related Art In recent years, overhead projectors and slide projectors have been widely used as means by which presenters present materials in conferences and the like, and video projectors and moving image film projectors have become widespread in ordinary households. In these projector devices, light output from a light source is spatially modulated by a light valve (Light Valve) to be image light, and the image light is projected on a projection screen through an illumination optical system such as a lens.
[0003]
Some of this type of projector device can display a color image, and a white light including three primary colors of red (Red = R), green (Green = G), and blue (Blue = B) as a light source. And a transmissive liquid crystal panel is used as the light valve. In this projector device, white light emitted from a light source is separated into red, green, and blue light beams by an illumination optical system, and these light beams are converged on a predetermined optical path. These light beams are spatially modulated by a liquid crystal panel in accordance with an image signal, the modulated light beams are combined as color image light by a light combining unit, and the combined color image light is enlarged and projected on a projection screen by a projection lens. .
[0004]
Recently, as a projector device capable of displaying a color image, a narrow band three primary color light source, for example, a laser oscillator emitting narrow band light of each of the three primary colors RGB is used as a light source, and a diffraction grating light valve (GLV) is used as a light valve. : Grating Light Valve) has been developed. In this projector device, the luminous flux of each color emitted from the laser oscillator is spatially modulated by the GLV according to the image signal. The luminous flux modulated in this manner is combined as color image light by a light combining unit in the same manner as in the above-described projector device, and the combined color image light is enlarged and projected on a projection screen by a projection lens.
[0005]
By the way, the projection screen used in the projector apparatus is of a transmission type in which projection light is emitted from the back side and viewed from the front side, and a reflection type in which projection light is emitted from the front side and the reflected light is viewed from the front side. Divided into In any method, it is desired to obtain a bright and high-contrast image in order to realize a screen with good visibility.
[0006]
FIG. 8 shows an example of a conventional rear projection display device. Reference numeral 101 denotes a video projection unit which is a projector device, 102 denotes a transmission screen, and 103 denotes a reflection mirror. In this rear projection type, as shown in FIG. 9, the transmission type screen 102 includes a conventional Fresnel lens 104 and a lenticular lens 105. In the rear-projection type display device having this configuration, the projected image light L from the image projection unit 101 becomes parallel light by the Fresnel lens 104 and is further diffused right and left by the lenticular lens 105. As described above, in the conventional rear projection display device, the projection image light L from the image projection unit 102 is enlarged and projected on the transmission screen 102. That is, the observer observes the projected image as light transmitted through the transmission screen 102.
[0007]
However, the above-described rear projection display device is generally used in a bright room in general, and in this case, external light such as indoor lighting is reflected on the surface of the lenticular lens, and this is observed together with image light emitted from the screen. As a result, there has been a problem that the contrast of the image is reduced.
[0008]
As a countermeasure, for example, a separate smoke plate is provided on the front surface of the lenticular lens to absorb a part of the external light, thereby suppressing a decrease in contrast. However, the configuration is complicated. And the fundamental solution has not been reached.
[0009]
In a lenticular lens, a black stripe may be provided between lens elements in order to lower the black level. However, in order to provide a sufficient lens effect, a black stripe cannot be formed at a certain interval or less. Not only has a limitation in improving the contrast, but also has a problem that the resolution is low.
[0010]
On the other hand, the present inventors have repeatedly studied for an optical film that is effective for improving the contrast of a transmission screen, and as a result, by alternately stacking layers having different refractive indices, a projector light such as light of three primary color wavelength ranges is obtained. It has been found that a selectively permeable film that mainly transmits light in the wavelength range of 2 is obtained. There are various types of laminated structures in which layers having different refractive indices are alternately laminated (for example, see Patent Documents 1 to 4), but those having the above selective transmission characteristics have not been proposed yet.
[0011]
[Patent Document 1]
JP-A-2002-207253
[Patent Document 2]
Japanese Patent No. 26691919
[Patent Document 3]
JP-A-11-287908
[Patent Document 4]
JP-A-2002-23068
[0012]
[Problems to be solved by the invention]
As described above, in the conventional transmissive screen, there is a problem that external light is reflected on the screen surface and the contrast of an image is reduced, and there has been a problem to be solved in the conventional measures. .
[0013]
The present invention has been made in view of the above-described problems of the related art, and uses a selective transmission film that mainly transmits light in a wavelength region of image light to form an image having high contrast without having a complicated structure. It is an object of the present invention to provide a screen capable of displaying and a manufacturing method thereof.
[0014]
Another object of the present invention is to provide an optical film and glasses provided with a selective transmission film that transmits light in the three primary color wavelength regions and reflects light in the other visible wavelength regions.
[0015]
[Means for Solving the Problems]
That is, the invention according to claim 1 is a screen which displays an image by irradiating image light, has a high transmission characteristic with respect to light of a specific wavelength region corresponding to the image light, and has at least a visible wavelength region excluding the specific wavelength region. It is characterized by comprising a selective transmission film that does not have high transmission characteristics for light.
[0016]
According to a second aspect of the present invention, in the screen of the first aspect, the selective transmission film has a high reflection characteristic with respect to light in a visible wavelength region excluding a specific wavelength region.
According to a third aspect of the present invention, in the screen of the second aspect, the permselective film is formed by alternately stacking a high refractive index layer made of a high refractive index material and a low refractive index layer made of a low refractive index material having a lower refractive index. It is characterized by comprising an optical multi-layered film.
[0017]
According to a fourth aspect of the present invention, in the screen of the third aspect, the optical multilayer film has a spacer layer made of a high-refractive-index material having a thickness larger than that of the front and rear high-refractive-index layers, and a refractive index of the spacer layer. Where N is the optical film thickness and D is the optical film thickness, and the following formula (1) or formula (2) is satisfied for each wavelength λ of light in a specific wavelength region.
ND = (n ± 1/2) λ (1)
ND = nλ (2)
(Where n represents a natural number)
[0018]
According to a fifth aspect of the present invention, in the screen of the third aspect, the high refractive index material contains niobium oxide, titanium oxide, or tantalum oxide.
According to a sixth aspect of the present invention, in the screen of the third aspect, the low refractive index material contains silicon oxide or magnesium fluoride.
[0019]
In the inventions according to the first to sixth aspects, the selective transmission film mainly transmits light in the wavelength region of image light and eliminates the entrance of external light including light in the other visible wavelength region. It is possible to display a simple image.
[0020]
According to a seventh aspect of the present invention, in the screen of the first aspect, an absorption layer is provided which absorbs light transmitted through the selective transmission film from the rear surface and incident light from the front surface at a predetermined absorption rate.
According to an eighth aspect of the present invention, in the screen of the seventh aspect, the absorption rate of the absorbing layer is 50 to 70%.
According to a ninth aspect of the present invention, in the screen of the seventh aspect, the absorbing layer includes an Nd filter.
[0021]
According to the seventh to ninth aspects of the present invention, the amount of reflected external light on the screen surface can be significantly reduced by the absorbing layer as compared with the amount of transmitted image light of the absorbing layer, and the contrast can be easily improved. Becomes possible.
[0022]
According to a tenth aspect of the present invention, there is provided the screen according to the first aspect, further comprising a Fresnel lens that converts the projected image light into parallel light and makes it incident on the selective transmission film. As a result, it is possible to prevent a decrease in luminance at the periphery of the screen where the incident angle of the image light increases.
[0023]
According to an eleventh aspect of the present invention, in the screen of the first aspect, a diffusion layer for scattering light transmitted through the selectively permeable film is provided. This makes it possible to display an image with a wide viewing angle with good visibility.
[0024]
According to a twelfth aspect of the present invention, in the screen according to the first aspect, the specific wavelength region includes a red light wavelength region, a green light wavelength region, and a blue light wavelength region. As a result, a color image with good contrast can be displayed.
[0025]
According to the invention of claim 13, in the optical film, the optical film has a high transmission characteristic with respect to light in the three primary color wavelength regions of red light, green light and blue light, and has a high transmittance with respect to light in the visible wavelength region excluding at least the three primary color wavelength regions. A selective transmission film having a reflection characteristic is provided.
[0026]
According to a fourteenth aspect of the present invention, in the optical film of the thirteenth aspect, the selective transmission film alternately includes a high refractive index layer made of a high refractive index material and a low refractive index layer made of a low refractive index material having a lower refractive index. It is characterized by comprising a laminated optical multilayer film.
[0027]
According to a fifteenth aspect of the present invention, in the optical film of the fourteenth aspect, the optical multilayer film has a spacer layer made of a high-refractive-index material having a thickness larger than that of the front and rear high-refractive-index layers. The optical film thickness ND when the ratio is N and the film thickness is D satisfies the following expression (1) or (2) for each wavelength λ of red light, green light and blue light. I do.
ND = (n ± 1/2) λ (1)
ND = nλ (2)
(Where n represents a natural number)
[0028]
According to a sixteenth aspect of the present invention, in the optical film of the fourteenth aspect, the high refractive index material includes niobium oxide, titanium oxide, or tantalum oxide.
According to a seventeenth aspect, in the optical film of the fourteenth aspect, the low refractive index material contains silicon oxide or magnesium fluoride.
[0029]
In the inventions of claims 13 to 17, since the filter mainly transmits light in the three primary color wavelength regions of red light, green light and blue light, it can be effectively used for improving contrast in a system for displaying a color image or the like. Becomes possible.
[0030]
The invention according to claim 18 is the glasses, wherein the selectively permeable film having high transmission characteristics for light in a specific wavelength region and not having high transmission characteristics for light in a visible wavelength region excluding at least the specific wavelength region is provided on the lens surface. It is characterized by being formed into a film.
[0031]
A nineteenth aspect of the present invention is the glasses according to the eighteenth aspect, wherein the selective transmission film has a high reflection characteristic with respect to light in a visible wavelength region excluding a specific wavelength region.
According to a twentieth aspect of the present invention, in the eyeglasses of the nineteenth aspect, the permselective film alternately laminates a high refractive index layer made of a high refractive index material and a low refractive index layer made of a low refractive index material having a lower refractive index. It is characterized by comprising an optical multi-layered film.
[0032]
According to a twenty-first aspect of the present invention, in the spectacles of the twentieth aspect, the optical multilayer film has a spacer layer made of a high-refractive-index material having a thickness larger than that of the front and rear high-refractive-index layers, and a refractive index of the spacer layer. Where N is the optical film thickness and D is the optical film thickness, and the following formula (1) or formula (2) is satisfied for each wavelength λ of the light in the specific wavelength region.
ND = (n ± 1/2) λ (1)
ND = nλ (2)
(Where n represents a natural number)
[0033]
The invention of claim 22 is the glasses of claim 18, wherein the specific wavelength region includes a red light wavelength region, a green light wavelength region, and a blue light wavelength region.
[0034]
In the inventions of claims 18 to 22, light reaching the eyes can be mainly only light of a specific wavelength region such as the three primary color wavelength regions, and an image composed of light of a specific wavelength region of a color image can be displayed with high contrast. It can be viewed.
[0035]
According to a twenty-third aspect of the present invention, in the method of manufacturing a screen for displaying an image by irradiating the image light, the screen has a high transmission characteristic with respect to light in a specific wavelength region corresponding to the image light, and at least the specific wavelength region is formed. Excluding a step of forming a selectively permeable film having no high transmission characteristic for light in a visible wavelength region excluding the above.
[0036]
According to a twenty-fourth aspect of the present invention, in the method for manufacturing a screen according to the twenty-third aspect, the permselective film includes a high refractive index layer made of a high refractive index material and a low refractive index layer made of a low refractive index material having a lower refractive index. It is characterized by comprising optical multilayer films alternately stacked.
[0037]
According to a twenty-fifth aspect of the present invention, in the method for manufacturing a screen according to the twenty-fourth aspect, the optical multilayer film has a spacer layer made of a high-refractive-index material having a thickness larger than that of the front and rear high-refractive-index layers. The optical film thickness ND, where N is the refractive index and D is the film thickness, satisfies the following expression (1) or (2) for each wavelength λ of the light in the specific wavelength region. I do.
ND = (n ± 1/2) λ (1)
ND = nλ (2)
(Where n represents a natural number)
[0038]
In the invention according to claims 23 to 25, a selective transmission film mainly transmitting light in the wavelength region of image light can be easily formed on the substrate, and a screen having the selective transmission film can be easily manufactured. Become.
[0039]
According to a twenty-sixth aspect of the present invention, in the method for manufacturing a screen according to the twenty-third aspect, a step of forming an absorption layer having a predetermined absorptance for light in a visible wavelength region on the substrate on which the selectively permeable film is formed. It is characterized by the following.
[0040]
In the invention according to claim 26, by forming an absorbing layer on the back surface of the substrate on which the permselective film is formed or on the permselective film, it is possible to easily manufacture a screen in which the permselective film and the absorbing layer are laminated. Become.
[0041]
According to a twenty-seventh aspect of the present invention, in the method for manufacturing a screen according to the twenty-third aspect, a step of forming an absorption layer having a predetermined absorptivity for light in a visible wavelength region on another substrate; Bonding the formed substrate and the substrate on which the absorption layer is formed.
[0042]
According to the twenty-seventh aspect of the present invention, the screen in which the permselective film and the absorption layer are laminated can be easily manufactured by forming the permselective film and the absorption layer on different substrates and bonding them in an arbitrary direction. Become.
[0043]
According to a twenty-eighth aspect of the present invention, in the method for manufacturing a screen of the twenty-sixth or twenty-seventh aspect, the absorption rate of the absorbing layer is 50 to 70%. This makes it possible to significantly reduce the amount of external light reflected on the screen surface by the absorption layer, compared to the amount of image light transmitted to the screen surface, making it possible to easily manufacture a screen with improved contrast. It becomes.
[0044]
A twenty-ninth aspect of the present invention is the method for manufacturing a screen according to the twenty-sixth or twenty-seventh aspect, further comprising the step of installing a Fresnel lens on the permselective film side of the laminate of the permselective film and the absorbing layer. This makes it possible to easily manufacture a screen without luminance unevenness.
[0045]
The invention according to claim 30 is characterized in that, in the method for manufacturing a screen according to claim 26 or 27, a step of forming a diffusion layer on the absorption layer side of the laminate of the permselective film and the absorption layer is provided. As a result, it is possible to easily manufacture a screen that displays an image with good visibility and a wide viewing angle.
[0046]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of a screen according to the present invention. In a rear projection type device in which image light L from a projector device enters from a back surface of a screen 1 via a reflection mirror 2, the screen 1 Is composed of a Fresnel lens 11, a permselective film 13 formed on one surface of a substrate 12, an absorption layer 14 formed on the other surface of the substrate 12, and a diffusion layer 15 arranged in this order in accordance with the traveling direction of the image light L. ing.
[0047]
The Fresnel lens 11 is for making the projection light from the projector apparatus parallel light, and is generally provided in a transmission screen.
[0048]
The substrate 12 is for forming the permselective film 13, and the material is not particularly limited, but is preferably transparent. As the substrate material, for example, a polymer material such as polyethylene terephthalate (PET), polycarbonate (PC), polyolefin (PO), polyethylene sulfide (PES), glass, or the like can be used. The substrate 12 may be provided with a hard coat layer for improving the strength of the substrate.
[0049]
The selective transmission film 13 has a high transmission characteristic with respect to light in the wavelength region of the image light L, for example, light in the three primary color wavelength regions of RGB, and has a high reflection characteristic with respect to light in a wavelength region other than the image light L. As shown in FIG. 2, a high refractive index layer H and a low refractive index layer L are alternately stacked on a substrate 12. The high refractive index layer H is a dielectric film formed of a high refractive index material, and the low refractive index layer L is a dielectric film formed of a low refractive index material having a lower refractive index than the high refractive index material.
[0050]
In FIG. 2, the permselective film 13 is designed as a known Fabry-Perot type filter, and has a structure in which a spacer layer 20 is sandwiched between reflecting mirrors 21. Here, the reflecting mirror 21 is composed of alternating layers of a high refractive index layer H and a low refractive index layer L. On the other hand, the spacer layer 20 is made of a high refractive index layer H having a thickness larger than that of the high refractive index layer H of the reflecting mirror 21. For the wavelength λ of the target image light,
ND = (n ± 1/2) λ (1)
Or
ND = nλ (2)
Is formed to satisfy However, in Expressions (1) and (2), n is a natural number.
[0051]
For example, when the image light is light in a narrow band three primary color wavelength range of 457 nm (blue), 532 nm (green), and 642 nm (red), the optical film thickness of the spacer layer 20 that satisfies all of the above conditions for these three wavelengths. As ND, ND = 1.06 μm can be mentioned. In this case, ND = 1.06 μm is approximately 2.5 times for λ = 457 nm, which satisfies the condition of Expression (1), and is approximately twice for λ = 532 nm. The condition is satisfied, that is, approximately 1.5 times for λ = 642 nm, which satisfies the condition of Expression (1). The expression (2) is a high-order λ film, but it goes without saying that the λ film is also a kind of λ / 2 film.
[0052]
FIG. 3 shows the transmission characteristics of the selective transmission film 13 in which the optical thickness ND of the spacer layer 20 is 1.06 μm, and shows high transmittance in the three primary color wavelength ranges. Although this spectral transmittance curve has a peak at 400 nm or 700 nm or more, it is also known that the influence can be eliminated by using an ultraviolet cut filter or an infrared cut filter.
[0053]
In the selectively permeable film 13, the high refractive index layer H has a high refractive index material having a refractive index of 1.5 or more, preferably 2.0 to 2.7, such as niobium oxide (Nb). ₂ O ₅ ), Tantalum oxide (Ta) ₂ O ₅ ), Titanium oxide (TiO) ₂ ) Is used, and a low refractive index material having a refractive index of less than 1.5, preferably 1.3 to 1.5, for example, silicon dioxide (SiO 2) is used for the low refractive index layer L. ₂ ), Magnesium fluoride (MgF ₂ ) Etc. are used. Such a high refractive index layer H and a low refractive index layer L can be formed by a dry process such as an evaporation method or a sputtering method.
[0054]
The absorption layer 14 is provided for absorbing external light incident from the front surface of the screen 1 and is formed on the back surface of the substrate 12 on which the permselective film 13 is formed. Alternatively, it can be formed on the permselective membrane 13. In that case, the Fresnel lens 11 is arranged on the back surface of the substrate 12. After the absorption layer 14 is formed on another substrate, the substrate may be bonded to the substrate 12 on which the permselective film 13 is formed. A dye film, a polarizing plate, a Nd filter (Neutral Density filter), and the like can be used for such an absorption layer 14, and the absorption layer 14 has a uniform absorption rate of 50 to 70% for light in the visible wavelength region. It is desirable that the surface reflection is small.
[0055]
For example, an Nd filter having a uniform transmittance in the visible light region is configured by laminating a dielectric film and a metal film, and an Nd filter proposed by the same applicant as the present applicant (Japanese Patent Application No. 2001-153731). According to the film design described in (1), not only can the transmittance in the visible light region be kept constant, but also the function of lowering the reflectance can be added. FIG. 4 shows a film configuration when the Nd filter 30 is formed on the substrate 12 as the absorption layer 14. In FIG. 4, the thickness of the first Nb layer 31 is 5.4 nm, and the thickness of the second Nb layer 31 is SiO. ₂ The thickness of the layer 32 is 89.5 nm, the thickness of the third Nb layer 33 is 8.8 nm, and the thickness of the fourth SiO ₂ When the thickness of the layer 34 is 74.4 nm, an Nd filter 30 having optical characteristics as shown in FIG. 5 is obtained. As shown in FIG. 5, the Nd filter 30 having this configuration has a uniform transmittance of 30% (absorbance of 70%) in the visible light region, but has a small reflectance of 1.9%, and has an anti-reflection property. Effects can also be added.
[0056]
The diffusion layer 15 is provided so as to scatter the image light transmitted through the selective transmission film 13 to widen the field of view and allow a natural image to be visually recognized. Such a diffusion layer 15 is not particularly limited, and a conventionally known diffusion layer such as a diffusion plate having an uneven surface, an array layer of beads, or a film on which a microlens array is formed can be used. .
[0057]
Next, a method for manufacturing the screen will be described with reference to specific examples.
First, for example, a PET film with a hard coat having a thickness of 188 μm is prepared as the substrate 12, and an optical multilayer film to be the permselective film 13 is formed by sputtering. Here, for example, Nb is used as the high refractive index layer H. ₂ O ₅ The layer is made of SiO 2 as the low refractive index layer L. ₂ The layers are deposited alternately by reactive AC sputtering.
[0058]
In the layer structure of the selective transmission film 13 shown in FIG. ₂ O ₅ Layer thickness of 47 nm, SiO ₂ The layer thickness is set to 107 nm, and Nb serving as the spacer layer 20 is formed. ₂ O ₅ When the thickness of the layer is 445 nm, optical characteristics as shown in FIG. 7 are obtained. In this example, in consideration of the projector device of the laser light source using the GLV, the transmittance of the laser light source at the wavelengths of 457 nm, 532 nm and 642 nm is designed as the RGB wavelength, and the transmittance of 457 nm (B) is set. Is 78.0%, the transmittance at 532 nm (G) is 75.2%, the transmittance at 642 nm (R) is 82.7%, and the average transmittance at each RGB wavelength is 78.6%. On the other hand, the average reflectance in the visible light region is 59.1%.
[0059]
On the back surface of the substrate 12 on which the permselective film 13 is formed, an Nd filter having a configuration as shown in FIG. Alternatively, an Nd filter is formed on a different substrate, and is bonded to the substrate 12 on which the permselective film 13 is formed. Finally, the Fresnel lens 11 is arranged on the light source side, and the diffusion layer 15 is arranged on the opposite side, thereby completing the process.
[0060]
When the image light L from the projector device is incident on the screen 1 having the selective transmission film 13 designed in accordance with the image light of the projector device as described above, the image light L is collimated by the Fresnel lens 11 and is selected. After transmitting through the transmission film 13 according to the average transmittance T in the wavelength region of the image light and further transmitting through the Nd filter which is the absorption layer 14 having the absorption rate A according to the transmittance (1-A), the diffusion layer 15 is formed. Is scattered in front of the screen. Due to the scattering of the transmitted light, an image with good visibility is displayed on the screen at a wide viewing angle.
[0061]
On the other hand, when the external light is incident on the front surface of the screen 1, it is partially absorbed by the Nd filter according to its absorption rate A, and partially transmitted according to its transmittance (1-A). External light transmitted through the Nd filter is reflected by the selective transmission film 13 in accordance with the average reflectance R in the visible light range, is again incident on the Nd filter and is absorbed, and the remaining transmitted light is scattered forward of the screen. .
[0062]
Therefore, when the image light projected on the screen 1 is 1, the transmitted light amount X of the image light is
X = T (1-A) (3)
When the external light applied to the screen 1 is set to 1, the reflected light amount Y of the external light is
Y = R (1-A) ² … (4)
It becomes. However, the reflection of the external light by the Nd filter is ignored because it is smaller than T and R.
[0063]
Here, when the optical characteristics of the selective transmission film 13 are as shown in FIG. 7 and the Nd filter has the optical characteristics as shown in FIG. 5, T = 78.6% and R = 59.1%. , A = 70%, and when these numerical values are substituted into Expressions (3) and (4), the transmitted light amount of image light X = 0.236 and the reflected light amount of external light Y = 0.053, and the contrast ratio It can be seen that X / Y is improved by 4.5.
[0064]
As is clear from the above description, in the present embodiment, it is possible to obtain a transmission screen capable of improving contrast without having a complicated structure.
[0065]
In the above embodiment, the design using a multilayer film made of an all-dielectric material having no absorption as the permselective film 13 is shown, but the present invention is applied to the case where a thin film having absorption such as a metal film is used. It is also possible to design to meet the purpose of the above.
[0066]
Further, the selective transmission film 13 designed for the projector device can be formed on a lens of the eyeglasses to provide viewing glasses for viewing an image of the projector device. When the projected image on the screen is viewed through the viewing glasses, light in the wavelength region of the image light mainly passes through the glasses, so that the contrast is dramatically improved.
[0067]
Further, the optical film in which the above-mentioned selective transmission film is formed on a substrate can be applied to various fields as a filter mainly transmitting light in the RGB primary color wavelength region.
[0068]
【The invention's effect】
As described above, according to the first to twelfth aspects of the present invention, the contrast in the transmission screen is improved without having a complicated structure by providing the selective transmission film that mainly transmits light in the wavelength region of image light. Can be done.
[0069]
According to the invention of claims 13 to 17, by providing the selective transmission film that mainly transmits light in the three primary color wavelength regions, it is possible to obtain an optical film effective as a filter for improving contrast in displaying a color image. .
[0070]
According to the inventions of claims 18 to 22, by providing the selective transmission film that mainly transmits light in the specific wavelength region, it is possible to obtain glasses capable of viewing an image composed of light in the specific wavelength region with high contrast. .
[0071]
According to the twenty-third to thirty-third aspects of the present invention, a transmissive screen capable of improving contrast can be easily manufactured by forming a selective transmission film mainly transmitting light in a wavelength region of image light on a substrate. be able to.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a first embodiment of a screen of the present invention.
FIG. 2 is a cross-sectional view illustrating a layer configuration of a permselective membrane according to the present invention.
FIG. 3 is a view showing an example of optical characteristics of a permselective film according to the present invention.
FIG. 4 is a cross-sectional view illustrating an example of a layer configuration of an Nd filter.
FIG. 5 is a diagram illustrating an example of optical characteristics of an Nd filter.
FIG. 6 is a cross-sectional view showing one embodiment of the permselective membrane according to the present invention.
FIG. 7 is a diagram showing optical characteristics of the selectively permeable film shown in FIG.
FIG. 8 is a diagram showing a configuration example of a conventional rear projection display device.
FIG. 9 is a diagram showing a conventional example of a transmission screen.
[Explanation of symbols]
1, 102 screen, 2, 103 reflection mirror, 11, 104 Fresnel lens, 12 substrate, 13 permselective film, 14 absorption layer, 15 diffusion layer, 20 layer Spacer layer, 21 ° reflector

Claims (30)

On a screen that displays an image by irradiating image light,
A selective transmission film having high transmission characteristics for light in a specific wavelength region corresponding to the image light, and having no high transmission characteristics for light in a visible wavelength region excluding at least the specific wavelength region. And screen. 2. The screen according to claim 1, wherein the selective transmission film has a high reflection characteristic with respect to light in a visible wavelength region excluding the specific wavelength region. The selective permeation film, comprising an optical multilayer film in which a high refractive index layer made of a high refractive index material and a low refractive index layer made of a low refractive index material having a lower refractive index are alternately laminated. 2. The screen according to 2. The optical multilayer film has a spacer layer made of a high-refractive-index material having a larger thickness than the front and rear high-refractive-index layers in the middle, wherein the refractive index of the spacer layer is N and the film thickness is D. 4. The screen according to claim 3, wherein the thickness ND satisfies the following expression (1) or expression (2) for each wavelength λ of the light in the specific wavelength region.
ND = (n ± 1/2) λ (1)
ND = nλ (2)
(Where n represents a natural number) The screen according to claim 3, wherein the high refractive index material includes niobium oxide, titanium oxide, or tantalum oxide. The screen according to claim 3, wherein the low refractive index material includes silicon oxide or magnesium fluoride. 2. The screen according to claim 1, further comprising an absorption layer that absorbs light transmitted through the selective transmission film from the rear surface and light incident from the front surface at a predetermined absorption rate. The screen according to claim 7, wherein the absorption rate of the absorption layer is 50 to 70%. The screen according to claim 7, wherein the absorption layer includes a Nd filter. The screen according to claim 1, further comprising a Fresnel lens that converts the projected image light into parallel light and makes the parallel light enter the selective transmission film. The screen according to claim 1, further comprising a diffusion layer that scatters light transmitted through the selective transmission film. The screen according to claim 1, wherein the specific wavelength region includes a red light wavelength region, a green light wavelength region, and a blue light wavelength region. Red light, green light and blue light having a high transmission characteristic for light in the three primary color wavelength regions, and a selective transmission film having high reflection characteristics for light in the visible wavelength region excluding at least the three primary color wavelength regions. An optical film, characterized in that: The selective permeation film, comprising an optical multilayer film in which a high refractive index layer made of a high refractive index material and a low refractive index layer made of a low refractive index material having a lower refractive index are alternately laminated. 14. The optical film according to 13. The optical multilayer film has a spacer layer made of a high-refractive-index material having a larger thickness than the front and rear high-refractive-index layers in the middle, wherein the refractive index of the spacer layer is N and the film thickness is D. The optical film according to claim 14, wherein the thickness ND satisfies the following expression (1) or expression (2) for each wavelength λ of red light, green light, and blue light.
ND = (n ± 1/2) λ (1)
ND = nλ (2)
(Where n represents a natural number) The optical film according to claim 14, wherein the high refractive index material includes niobium oxide, titanium oxide, or tantalum oxide. The optical film according to claim 14, wherein the low refractive index material contains silicon oxide or magnesium fluoride. A selective transmission film having high transmission characteristics for light in a specific wavelength region and not having high transmission characteristics for light in a visible wavelength region excluding at least the specific wavelength region is formed on the lens surface. And glasses. 19. The glasses according to claim 18, wherein the selectively permeable film has a high reflection characteristic with respect to light in a visible wavelength region excluding the specific wavelength region. The selective permeation film, comprising an optical multilayer film in which a high refractive index layer made of a high refractive index material and a low refractive index layer made of a low refractive index material having a lower refractive index are alternately laminated. 19. Glasses according to 19. The optical multilayer film has a spacer layer made of a high-refractive-index material having a larger thickness than the front and rear high-refractive-index layers in the middle, wherein the refractive index of the spacer layer is N and the film thickness is D. 21. The glasses according to claim 20, wherein the thickness ND satisfies the following expression (1) or expression (2) for each wavelength λ of the light in the specific wavelength region.
ND = (n ± 1/2) λ (1)
ND = nλ (2)
(Where n represents a natural number) 19. The glasses according to claim 18, wherein the specific wavelength region includes a red light wavelength region, a green light wavelength region, and a blue light wavelength region. In a method of manufacturing a screen for displaying an image by irradiation of image light,
On the substrate, a selective transmission film having high transmission characteristics for light in a specific wavelength region corresponding to the image light, and having no high transmission characteristics for light in a visible wavelength region excluding at least the specific wavelength region is formed. A method for producing a screen, comprising the steps of: The selective permeation film, comprising an optical multilayer film in which a high refractive index layer made of a high refractive index material and a low refractive index layer made of a low refractive index material having a lower refractive index are alternately laminated. 24. The method for producing a screen according to 23. The optical multilayer film has a spacer layer made of a high-refractive-index material having a larger thickness than the front and rear high-refractive-index layers in the middle, wherein the refractive index of the spacer layer is N and the film thickness is D. The method according to claim 24, wherein the thickness ND satisfies the following expression (1) or (2) for each wavelength λ of the light in the specific wavelength region.
ND = (n ± 1/2) λ (1)
ND = nλ (2)
(Where n represents a natural number) 24. The method for manufacturing a screen according to claim 23, further comprising a step of forming an absorption layer having a predetermined absorptance on light in a visible wavelength region on the substrate on which the selective transmission film is formed. Forming an absorption layer having a predetermined absorptivity for light in the visible wavelength region on another substrate,
24. The method for manufacturing a screen according to claim 23, further comprising: bonding a substrate on which the selectively permeable film is formed and a substrate on which the absorption layer is formed. 28. The method according to claim 26, wherein the absorption rate of the absorbing layer is 50 to 70%. 28. The screen manufacturing method according to claim 26, further comprising a step of installing a Fresnel lens on the permselective film side of the laminate of the permselective film and the absorbing layer. 28. The method for manufacturing a screen according to claim 26, further comprising a step of forming a diffusion layer on the absorption layer side of the laminate of the permselective film and the absorption layer.

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