JP2004240159A - Screen and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen where the wide angle of visibility is made compatible with high contrast and to provide its manufacturing method. <P>SOLUTION: The screen is equipped with a condensing lens group 15 constituted by arranging a plurality of condensing lenses to be planar between a selective reflection layer 12 and a diffusing plate 17 on a screen base plate 11, and equipped with an absorbing layer pattern 14 in the emitting area of external light having an optical axis different from the projector light on the condensing lens between the lens group 15 and the layer 12. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screen capable of viewing a high-contrast image at a wide viewing angle under bright light, and a method for manufacturing the same.
[0002]
[Prior art]
2. Description of the Related Art In recent years, overhead projectors and slide projectors have been widely used as a method of presenting materials by a speaker in a conference or the like. In addition, video projectors and moving image film projectors using liquid crystals are becoming popular in ordinary households. In the projection methods of these projectors, light output from a light source is light-modulated by a light valve to form image light, and this image light is emitted through an optical system such as a lens and projected on a screen.
[0003]
As this type of projector, there is a projector capable of displaying a color image. As a light source, white light including red (Red = R), green (Green = G), and blue (Blue = B), which are three primary colors, is used. A light-emitting lamp is used, and a transmissive liquid crystal panel is used as a light valve. In this projector, white light emitted from the light source is separated into red, green, and blue light rays by an illumination optical system, and these light rays are converged on a predetermined optical path. These light beams are spatially modulated by a liquid crystal panel according to 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 screen by a projection lens.
[0004]
Recently, as a projector 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 has been used as a light source, and a diffraction grating light valve (GLV: An apparatus using Grating Light Valve has been developed. In this projector, the luminous flux of each color emitted by 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 projector described above, and the combined color image light is enlarged and projected on a screen by a projection lens.
[0005]
As a screen used in such a projector, for example, there is a screen which reflects image light emitted from a projector (front projector) in front of the screen so that a projected image can be viewed by reflected light. In order to obtain high visibility, it is required to display images with a wide viewing angle, high contrast, and high brightness.
[0006]
Here, the viewing angle is an angle at which the reflection luminance at the center of the screen is halved, and 15 degrees or more is practically required. Since such a viewing angle can be increased by scattering the reflected image light, a diffusion layer for scattering light is usually provided on the screen surface, and by increasing the diffusion angle of the diffusion layer, a wide viewing angle is obtained. Corners are planned.
[0007]
On the other hand, the contrast expressed by the ratio between the white image luminance (white level) and the black image luminance (black level) is how to reduce the black level by suppressing the reflection of external light. Unless the room is darkened on the screen, there is a problem in contrast performance that the image projected by the projector cannot be seen well.
[0008]
As a screen that can solve this problem and display high-contrast images even in a bright room, beads that are transparent so that the projected light passes through and that are colored so that visible light is absorbed in the other parts A device in which a plurality of substrates are attached on a screen substrate has been proposed (for example, see Patent Document 1).
[0009]
[Patent Document 1]
JP-A-8-137909 (paragraphs [0015] to [0016], FIGS. 3 and 4)
[0010]
[Problems to be solved by the invention]
However, in the above screen, it is necessary to appropriately mix beads having different refractive indices in order to secure a wide viewing angle, and a transparent layer is formed on colored beads using a photosensitive material as a material for the beads. There were practical problems such as material selection and quality stability.
[0011]
On the other hand, by the same applicant as the present applicant, using a selective reflection layer that selectively reflects light according to the wavelength region, mainly reflects image light projected from the projector, For example, a screen (for example, Japanese Patent Application No. 2002-070799) has been proposed in which light from a fluorescent lamp or the sun, that is, external light is not reflected. FIG. 5 shows an example of the configuration of this screen. A selective reflection layer 92 is formed on a screen substrate 91, and a diffusion layer 93 that scatters reflected light on the front surface of the selective reflection layer 92 is further provided. An absorption layer 98 that absorbs transmitted light is provided at the back. In this screen, since the influence of external light can be greatly reduced, the black level can be reduced without lowering the screen gain even in a bright room, and a clear image with high contrast can be displayed. .
[0012]
However, in this screen as well, it is necessary to increase the diffusion angle of the diffusion layer 93 in order to widen the viewing angle. In general, when the diffusion angle of the diffusion layer 93 is small, external light incident from above the screen is not diffused. Although the rate of transmission through the diffusion layer 93 is small, but when the diffusion angle is increased, the rate of transmission through the diffusion layer 93 increases, so that the amount of external light reflected by the selective reflection layer 93 increases and the black level increases. As a result, the contrast is reduced. This is because, as shown in FIG. 6, the selective reflection layer 92 does not completely transmit, but slightly reflects, even the wavelength a outside the wavelength region of the image light, as shown in FIG.
[0013]
The present invention has been made in view of the above problems, and can suppress the influence of external light even when the diffusion angle of the diffusion layer is increased, and can provide a wide viewing angle, high contrast, and high brightness under bright light. And a method for manufacturing the same.
[0014]
[Means for Solving the Problems]
According to a first aspect of the present invention, in a screen for displaying an image by irradiating the image light, a reflection layer that reflects the image light, a diffusion layer that scatters the light reflected by the reflection layer, and a diffusion layer that is provided between the diffusion layer and the reflection layer. And a condenser lens group in which a plurality of condenser lenses for condensing light incident through the diffusion layer are provided. The condenser lens group is provided between the condenser lens group and the reflective layer, and enters from a different direction from image light. A light absorbing layer pattern for absorbing light.
[0015]
According to the first aspect of the present invention, image light incident within a predetermined incident angle range passes through the diffusion layer, is converged by each condenser lens, is reflected by the reflection layer, follows the reverse path, and is conveyed by the diffusion layer. Spread. On the other hand, external light incident at an angle larger than the incident angle range of image light, such as ceiling illumination, is more likely to pass through the diffusion layer when the diffusion angle of the diffusion layer is increased. It is absorbed by the absorption layer pattern formed behind each condenser lens and is not reflected by the reflection layer. Therefore, even if the diffusion angle of the diffusion layer is increased to increase the viewing angle, it is possible to prevent an increase in black level due to the transmission of external light through the diffusion layer, and to realize a screen with a wide viewing angle and high contrast. Becomes possible. The reflective layer only needs to reflect image light. For example, a high-brightness screen can be obtained by using a metal material such as aluminum or a material having a high reflectance such as a brilliant pigment.
[0016]
According to a second aspect of the present invention, in the screen of the first aspect, a layer having a lower refractive index than each constituent material is provided between the diffusion layer and the condenser lens group and between the condenser lens group and the reflection layer. It is characterized by.
According to a third aspect of the present invention, in the screen of the second aspect, the layer having a low refractive index contains an adhesive.
[0017]
According to the second and third aspects of the present invention, only the optical characteristics of the diffusion layer, the condenser lens group, and the reflection layer need to be considered, and the screen design becomes easy. The layers provided between the diffusion layer and the condenser lens group and between the condenser lens group and the reflection layer transmit light in the visible wavelength region, and include the diffusion layer, the condenser lens and the reflection layer. Any material may be used as long as the material has a lower refractive index than the material constituting the material.
[0018]
According to a fourth aspect of the present invention, in the screen of the first aspect, the condenser lens group is a lenticular lens.
According to a fifth aspect of the present invention, in the screen of the first aspect, the condenser lens group is a microlens array.
According to a sixth aspect of the present invention, in the screen of the first aspect, the condenser lens is a transparent cylindrical rod or a spherical bead.
[0019]
According to the fourth to sixth aspects of the present invention, it becomes possible to condense the light incident through the diffusion layer. The lenticular lens has a configuration in which the lenticular lens is continuous in a direction orthogonal to the longitudinal direction, and the absorption layer pattern formed on the back surface of the lenticular lens has a stripe shape. When the longitudinal direction of the camera-shaped lens is the horizontal direction of the screen, external light incident on the screen from above, for example, light from ceiling illumination, can be absorbed by the absorption layer pattern. On the other hand, if the longitudinal direction of the lens is the vertical direction of the screen, external light that enters the screen from the lateral direction, for example, sunlight that enters from the window, can be absorbed by the absorbing layer pattern. It becomes. The same operation and effect as the lenticular lens can be obtained even if the transparent cylindrical rods are arranged. When a microlens array is used as a condenser lens group, external light incident from the top, bottom, left, and right can be absorbed by the absorption layer pattern. Similar effects can be obtained by using a large number of beads instead of the microlens array.
[0020]
According to a seventh aspect of the present invention, in the screen of the first aspect, the arrangement pitch of the condenser lenses is smaller than one pixel. This makes it possible to obtain a screen with good image quality.
[0021]
According to an eighth aspect of the present invention, in the screen according to the first aspect, the reflection layer has a high reflection characteristic with respect to light in a specific wavelength region corresponding to image light, and light in a visible wavelength region excluding at least the specific wavelength region. Characterized by having high transmission characteristics with respect to
According to a ninth aspect of the present invention, in the screen of the eighth aspect, the reflection layer is formed of an optical multilayer film in which a high refractive index layer and a low refractive index layer having a lower refractive index are alternately laminated.
According to a tenth aspect of the present invention, there is provided the screen of the eighth aspect, further comprising an absorbing layer for absorbing light transmitted through the reflecting layer.
An eleventh aspect of the present invention is the screen of the eighth aspect, wherein the specific wavelength region includes a red light wavelength region, a green light wavelength region, and a blue light wavelength region.
[0022]
In the invention according to claims 8 to 11, even if external light is incident from substantially the same direction as the image light, the reflective layer reflects almost all external light components in the wavelength region of the image light, for example, the wavelength region excluding the RGB three primary color wavelength regions. Because the reflective layer does not reflect the light, the effect of external light can be further reduced and the black level can be reduced as compared to the case where the reflective layer reflects all light in the visible wavelength range, and a higher-contrast image is displayed under bright light. It is possible to do.
[0023]
According to a twelfth aspect of the present invention, in the method of manufacturing a screen for displaying an image by irradiating image light, a diffusion layer is formed on a converging light incident side of a condenser lens group in which a plurality of condenser lenses are arranged. A forming step, a step of forming a photosensitive resin layer containing a light absorbing agent on the converging light exit side of the condenser lens group, and a step of forming light on the photosensitive resin layer through a diffusion layer and a condenser lens group. An exposing step of irradiating and exposing from the position of, a step of forming an absorbing layer pattern by removing the exposed portion of the photosensitive resin layer, and a reflecting layer on the surface of the condenser lens group where the absorbing layer pattern is formed. Forming a reflective layer.
[0024]
According to a thirteenth aspect of the present invention, in the method for manufacturing a screen according to the twelfth aspect, the step of forming the diffusion layer includes the step of diffusing the light into the condensing lens group using an adhesive having a lower refractive index than the constituent materials of the condensing lens group and the diffusion layer. The method includes a step of bonding a diffusion plate to be a layer.
According to a fourteenth aspect of the present invention, in the method of manufacturing a screen according to the twelfth aspect, the predetermined position in the exposure step is set in accordance with an irradiation position of image light.
According to a fifteenth aspect of the present invention, in the method for manufacturing a screen according to the twelfth aspect, in the reflecting layer forming step, an adhesive having a lower refractive index than the constituent materials of the condenser lens group and the reflection layer is used to reflect light to the condenser lens group. The method includes a step of bonding a substrate on which a layer is formed.
According to a sixteenth aspect of the present invention, in the screen manufacturing method of the twelfth aspect, the condenser lens group is a lenticular lens or a microlens array.
[0025]
According to the twelfth to sixteenth aspects, it is possible to easily manufacture a screen having a wide viewing angle, high contrast, and high brightness.
[0026]
According to a seventeenth aspect of the present invention, in the method for manufacturing a screen according to the twelfth aspect, the reflective layer has a high reflection characteristic with respect to light in a specific wavelength region corresponding to the image light, and a visible wavelength excluding at least the specific wavelength region. It is characterized by having high transmission characteristics with respect to light in the region.
According to an eighteenth aspect of the present invention, in the method for manufacturing a screen according to the seventeenth aspect, the reflection layer comprises an optical multilayer film in which a high refractive index layer and a low refractive index layer having a lower refractive index are alternately laminated. I do.
According to a nineteenth aspect, in the method for manufacturing a screen according to the seventeenth aspect, the reflection layer is formed on a substrate provided with the absorption layer.
[0027]
According to the seventeenth to nineteenth aspects, it is possible to easily manufacture a screen having higher contrast and excellent performance.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating a configuration according to the first embodiment of the present invention. As shown in FIG. 1, the screen 10 includes a selective reflection layer 12, an adhesive layer 13, an absorption layer pattern 14, a lenticular lens 15, an adhesive layer 16, and a diffusion plate 17 on a screen substrate 11, An absorption layer 18 is provided on the back surface of the screen substrate 11.
[0029]
The screen substrate 11 serves as a support for the screen, and various materials can be used as long as the material has strength as a screen. For example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), It can be composed of a polymer such as polyethersulfone (PES) and polyolefin (PO).
[0030]
The selective reflection layer 12 reflects light in the wavelength region of the projector light, for example, red (R), green (G), and blue (B) in the three primary color wavelength regions, and transmits light in the wavelength region other than the three primary color wavelength regions. An optical thin film having characteristics, for example, an optical multilayer film (Japanese Patent Application No. 2002-070799) proposed by the same applicant as the present applicant is used. This optical multilayer film is formed by alternately laminating high-refractive-index layers and low-refractive-index layers, and is designed to selectively reflect light in a specific wavelength region such as the wavelength region of three primary colors as shown in FIG. ing.
[0031]
It should be noted that, instead of the selective reflection layer 12, a reflection layer in the visible light region using a material that reflects light, such as a metal material having high reflectivity, such as aluminum, or a brilliant pigment, according to the present invention, can provide a wide viewing angle and a high reflection angle. The effect of achieving both the contrast and the contrast can be obtained. Such a reflective layer can be formed on the surface of the screen substrate 11 by an evaporation method, a coating method, or the like. In addition, a metal thin film, a metal plate, or a metal deposition film may be attached to the screen substrate 11. Further, the screen substrate 11 may be made of a reflective material.
[0032]
The absorption layer pattern 14 is a layer having a characteristic of absorbing visible light, and is a stripe-shaped light absorption film provided with a predetermined margin on the flat surface (back side) of the lenticular lens 15. Each stripe is a linear strip film having a predetermined width and being parallel to the longitudinal direction of the lenticular lens 15 of the lenticular lens 15, and is located almost directly below the concave portion of the lenticular lens 15 having the uneven surface. Specifically, the width and position of the absorption layer pattern 14 are regions where external light having a different optical axis from the projector light is emitted from the lenticular lens 15 when the screen 10 is used, and the external light is absorbed by the absorption layer pattern 14. You. Conversely, a portion where the light absorbing film does not exist is a region where light from the front of the screen 10 is collected and emitted by the lenticular lens 15, and the light reaches the selective reflection layer 12.
[0033]
Further, since the light L1 from the projector is actually projected through the projection lens, the angle of incidence on the screen has a certain angle range as well as the perpendicular incidence on the screen 10 as shown in FIG. Therefore, it is desirable to determine the absorption layer pattern 14 according to the angle range. That is, the absorption layer pattern 14 may be formed according to the angle of incidence of the projector light on the screen 10. For example, the absorption layer pattern may be gradually shifted from the center to the periphery of the screen 10. . Alternatively, a pattern design may be performed in which the absorption layer pattern is fixed and an appropriate margin dimension is set in consideration of the incident angle range of the projector light.
[0034]
The lenticular lens 15 is a condensing lens group having a form in which a minute semi-cylindrical lens (kamaboko lens) is connected in a direction perpendicular to the longitudinal direction, and covers the selective reflection layer 12 on the screen substrate 11. Are located. The material is not particularly limited as long as it has a property of transmitting light in a wavelength range used in the projector, and may be a normal lens constituent material such as glass or plastic, and the pitch of this lens is larger than one pixel. It is getting smaller.
[0035]
When the lenticular lens 15 is arranged on the screen 10 so as to correspond to the incident direction of external light, high contrast can be efficiently achieved. For example, when external light is incident on the screen 10 from above, the longitudinal direction (the direction perpendicular to the paper surface in FIG. 1) of the semi-cylindrical lens is a horizontal direction on the screen 10, and the external light is On the other hand, when light enters from the horizontal direction, it is preferable that the longitudinal direction of the semi-cylindrical lens is the vertical direction on the screen 10.
Note that the same effects as those of the present invention can be obtained by using a microlens array instead of the lenticular lens 15. In this case, even if external light enters the screen 10 from any direction, up, down, left, and right, the influence on the image light can be eliminated.
[0036]
The diffuser plate 17 has one surface having an uneven shape, and the constituent material is not particularly limited as long as it has a property of transmitting light in a wavelength range used in the projector. Plastic may be used. For example, it is made of an epoxy resin. The light reflected by the selective reflection layer 12 is diffused when transmitted through the diffusion plate 17 and emitted, and the viewer can visually recognize a natural image by observing the diffused reflected light. . The diffusion angle of the diffusion plate 17 is an important factor that determines the visibility, and the diffusion angle is increased by adjusting the refractive index of the material constituting the diffusion plate and the unevenness of the surface.
When the light source of the projector is a laser, the surface shape pattern of the diffusion plate 17 may be made random in order to prevent the generation of a speckle pattern which is a glare on the screen.
[0037]
The adhesive layer 13 is a layer for bonding the selective reflection layer 12 and the lenticular lens 15 and has a lower refractive index than the material forming the selective reflection layer 12 and the lenticular lens 15. The adhesive layer 16 is a layer for bonding the lenticular lens 15 and the diffusion plate 17 and has a lower refractive index than the material forming the lenticular lens 15 and the diffusion plate 17. The adhesive layers 13 and 16 may be made of the same material, and may be formed by bonding necessary components using a low-refractive-index transparent adhesive, followed by curing.
[0038]
In addition, the adhesive layers 13 and 16 may be an adhesive layer to which the selective reflection layer 12 and the lenticular lens 15 or the lenticular lens 15 and the diffusion plate 17 are adhered so as not to be practically separated.
The space between the selective reflection layer 12 and the lenticular lens 15 or the space between the lenticular lens 15 and the diffusion plate 17 does not necessarily need to be filled with the adhesive (including the adhesive). If the adhesive strength is secured by the above, that portion may be used as an air layer.
[0039]
The absorption layer 18 is for absorbing the light transmitted through the selective reflection layer 12, and for example, a black resin film is attached to the back surface of the screen substrate 11 opposite to the surface on which the selective reflection layer 12 is formed. Alternatively, it can be formed by applying a black paint on the front or back surface of the screen substrate 11, or dispersing black fine particles such as carbon powder in the screen substrate 11. The absorption layer 18 becomes unnecessary when a reflection layer that uniformly reflects visible light is used instead of the selective reflection layer 12.
[0040]
Next, a method for manufacturing the screen 10 according to the present invention will be described with reference to FIG.
(S1) A screen substrate 11 made of a PET film is prepared as a screen substrate, and a selective reflection layer 12 is formed on one surface of the screen substrate 11 by a vacuum thin film forming method such as vapor deposition or sputtering, or a coating method using a solvent. Form a film. In the case of using a vacuum thin film forming method, for example, TiO is used as a high refractive index layer by AC sputtering. ₂ , Nb ₂ O ₅ , Ta ₂ O ₅ And a high refractive index material such as ₂ , MgF ₂ And the like and a low refractive index material. At this time, the thickness of each layer is designed in accordance with the wavelength range of the light to be used. Alternatively, when using a coating method, for example, thermosetting resins having different refractive indices are used as the high refractive index layer and the low refractive index layer. Further, a black paint is also applied to the back surface of the screen substrate 11 to form the absorbing layer 18.
[0041]
(S2) A low-refractive-index transparent adhesive (EPOTEK396 manufactured by EPOXY TECHNOLOGY) is applied to the uneven surface (front surface) of the lenticular lens 15 and is opposite to the uneven surface of the diffusion plate 17 thereon. After mounting the surface as a contact surface, the adhesive is cured to form an adhesive layer 16 for bonding the lenticular lens 15 and the diffusion plate 17 (FIG. 2A).
[0042]
(S3) A photosensitive resin containing a black light absorbing agent is applied to the back surface of the lenticular lens 15 to form a photosensitive resin layer 19 (FIG. 2B).
(S4) By irradiating the lenticular lens 15 with predetermined light from the diffusion plate 17 side from the projector irradiation position in front of the screen, the light is condensed by the lenticular lens 15 and the photosensitive resin layer in the emission area of the lenticular lens 15 19 is exposed (FIG. 2C).
(S5) The exposed portion of the photosensitive resin layer 19 is removed by developing with a predetermined developer, and the absorption layer pattern 14 is formed (FIG. 2D).
[0043]
(S6) An adhesive layer 13 for bonding the back surface of the lenticular lens 15 (partially the absorbing layer pattern 14) and the selective reflection layer 12 is formed by the same method as in step s2, to obtain the screen 10 according to the present invention.
At the time of exposure in step s4, the irradiation position for exposure may be moved back and forth within the range of the assumed projector irradiation position.
[0044]
For example, when the screen 10 projects light from an RGB light source such as a diffraction grating projector using a grating light valve (GLV), the screen 10 has a wide viewing angle and a high contrast. Good images without reflection of light can be appreciated.
[0045]
That is, in FIG. 1, the amount of external light L91 transmitted through the diffusion plate 17 increases as the diffusion angle of the diffusion plate 17 increases (wider viewing angle), but as described above, the screen 10 of the lenticular lens 15 increases. By devising the arrangement above and the arrangement of the absorption layer pattern 14 with respect to the lenticular lens 15, the external light can be efficiently absorbed.
As a result, the light L1 from the front of the screen 10 passes through the diffusion plate 17, is condensed by the lenticular lens 15, reaches the selective reflection layer 12, and is exposed to the external light included in the light L1 by the selective reflection layer 12. While most of the components are transmitted, only light in a specific wavelength region related to an image is selectively reflected, and the reflected light again passes through the lenticular lens 15 and is diffused on the surface of the diffusion plate 17 as image light having a wide viewing angle. Provided to viewers. On the other hand, the external light L91 irradiating the screen 10 from above, such as illumination, passes through the diffusion plate 17 and is collected by the lenticular lens 15, but reaches the absorption layer pattern 14 because the light L1 has a different optical axis. It is absorbed by the absorption layer pattern 14. Therefore, the influence of external light on the image light, which is the reflected light, can be eliminated at a high level, and it is possible to achieve both a wide viewing angle and a high contrast, which have not been achieved conventionally.
[0046]
FIG. 3 is a cross-sectional view illustrating a configuration according to the second embodiment of the present invention. The configuration of the screen 20 according to the second embodiment is the same as the configuration according to the first embodiment except that the lenticular lens 15 is a cylindrical rod-shaped condenser lens group 25 in FIG. A selective reflection layer 22, an adhesion layer 23, an absorption layer pattern 24, a condenser lens group 25, an adhesion layer 26, and a diffusion plate 27 are provided on a substrate 21, and an absorption layer 28 is provided on the back surface of the screen substrate 21. Have.
[0047]
The condenser lens group 25 is a condenser lens group having a form in which a cylindrical rod-shaped condenser lens is arranged in a direction perpendicular to the longitudinal direction, and is disposed so as to cover the selective reflection layer 22 on the screen substrate 21. Have been. Further, the material may be a normal lens constituent material such as glass or plastic, and the pitch of the lens is smaller than one pixel.
[0048]
The arrangement on the screen 20 is the same as that of the lenticular lens 15 of the first embodiment, and when external light is incident on the screen 20 from above, the cylindrical rod-shaped condensing lens is used. Is the horizontal direction on the screen 20 in FIG. 3, and when external light enters the screen 20 from the horizontal direction, the longitudinal direction of the cylindrical rod-shaped condensing lens is Is preferably set in the vertical direction on the screen 20.
The same effect as the present invention can be obtained by using a bead-shaped condenser lens instead of the cylindrical rod-shaped condenser lens. In this case, even if external light is incident on the screen 20 from any of up, down, left, and right directions, the influence on the image light can be eliminated.
[0049]
The absorbing layer pattern 24 is a layer having a characteristic of absorbing visible light as in the first embodiment. On the selective reflection layer 22 side of the condenser lens group 25, the condenser lens has a cylindrical rod shape. In the case of, it is a stripe-shaped light absorption film provided between the condenser lenses constituting the condenser lens group 25. When the condenser lens has a bead shape, a region other than the vicinity of the apex of the bead becomes a light absorbing film. More specifically, the width and position of the light absorbing film are regions where external light having an optical axis different from that of the projector light is emitted from the condenser lens group 25 when the screen 20 is used, and the external light is absorbed by the light absorbing film. You. Conversely, a portion where the light absorbing film does not exist is a region where light from the front of the screen 20 is collected and emitted by the condenser lens group 25, and the light reaches the selective reflection layer 22.
[0050]
Next, a method of manufacturing the screen 20 according to the present invention will be described with reference to FIG. In the following, only a process different from the manufacturing process of the first embodiment, that is, a process of forming the condenser lens group 25 in place of the lenticular lens 15 will be described. Other steps are the same as the manufacturing steps (steps s1, s6) in the first embodiment. Also, here, a cylindrical rod-shaped condenser lens will be described as an example, but the same manufacturing method is applied to a bead-shaped condenser lens.
[0051]
(S22) The condensing lenses in the form of cylindrical rods are arranged on a plane without any gap to form a condensing lens group 25, and a low-refractive-index transparent adhesive (EPOTEK396 manufactured by EPOXY TECHNOLOGY) is applied to the upper surface (front surface). Then, after mounting the surface opposite to the uneven surface of the diffusion plate 27 as a contact surface thereon, the adhesive is cured to form an adhesive layer 26 for bonding the condenser lens group 25 and the diffusion plate 27 (FIG. 4 (a)).
(S23) A photosensitive resin containing a black light absorbing agent is applied to the back surface of the condenser lens group 25 to form a photosensitive resin layer 29 (FIG. 4B).
(S24) By irradiating predetermined light from the projector irradiation position in front of the screen to the condenser lens group 25 from the diffusion plate 27 side, the light is condensed by the condenser lens group 25 and emitted from the condenser lens group 25. The photosensitive resin layer 29 in the region is exposed (FIG. 4C).
(S25) The exposed portion of the photosensitive resin layer 29 is removed by developing with a predetermined developing solution, and an absorption layer pattern 24 having a predetermined pattern is formed (FIG. 4D).
[0052]
The screen 20 has the same effect as the screen 10 of the first embodiment.
That is, in FIG. 3, the amount of the external light L <b> 92 transmitted through the diffusion plate 27 increases with an increase in the diffusion angle of the diffusion plate 27 (widening the viewing angle), By devising the arrangement and the arrangement of the absorption layer pattern 24 with respect to the condenser lens group 25, it is possible to efficiently absorb the external light, and it is possible to achieve both a wide viewing angle and a high contrast, which were not possible in the past. It becomes.
[0053]
【The invention's effect】
As described above, according to the first aspect of the present invention, by adjusting the arrangement of the condenser lens group on the screen and the arrangement of the absorption layer pattern with respect to the condenser lens group, the light enters the screen from an angle other than the front of the screen. Light can be absorbed by the absorption layer pattern, and both a wide viewing angle and a high contrast can be achieved.
[0054]
According to the second and third aspects of the present invention, the screen design is facilitated by making the layers through the diffusion plate, the condenser lens group, and the reflection layer relatively low refractive index layers.
[0055]
According to the invention of claims 4 to 6, by using a lenticular lens, a microlens array, a columnar rod array, or a bead group as the condenser lens group, the light incident through the diffusion layer is condensed, and Image light and external light can be separated according to the light condensing position.
[0056]
According to the seventh aspect of the invention, by setting the arrangement pitch of the condenser lens to be smaller than one pixel, a screen with good image quality can be obtained.
[0057]
According to the invention of claims 8 to 11, by providing a selective reflection layer that mainly reflects light in the wavelength region of image light and transmits light in other wavelength regions, all light in the visible wavelength region is reduced. Compared with the case where the reflective layer is provided, the black level can be reduced by further reducing the influence of external light, and an image with higher contrast can be displayed under bright light.
[0058]
According to the twelfth to sixteenth aspects, it is possible to achieve both a wide viewing angle and a high contrast by adjusting the arrangement of the condenser lens group on the screen and the arrangement of the absorption layer pattern with respect to the condenser lens group. Simple screen can be easily manufactured.
[0059]
According to the seventeenth to nineteenth aspects of the present invention, by using a selective reflection layer as the reflection layer, it is possible to eliminate the influence of external light on image light at a high level. It is possible to produce a screen that is compatible with the process.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a configuration of a screen according to a first embodiment of the present invention.
FIG. 2 is a manufacturing process diagram of a screen according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view illustrating a configuration of a screen according to a second embodiment of the present invention.
FIG. 4 is a manufacturing process diagram of a screen according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view illustrating a configuration example of a screen having a selective reflection layer.
FIG. 6 is a schematic view showing the reflection characteristics of a selective reflection layer.
[Explanation of symbols]
10, 20, 90 ... screen, 11, 21, 91 ... screen substrate, 12, 22, 92 ... selective reflection layer, 13, 16, 23, 26 ... adhesive layer, 14, 24 ... absorption layer pattern, 15 ... lenticular lens , 17, 27, 93: diffusion plate, 18, 28, 98: absorption layer, 25: condenser lens group, 19, 29: photosensitive resin layer, L1, L2: projector light, L91, L92: external light, UV … Ultraviolet light

Claims (19)

On a screen that displays an image by irradiating image light,
A reflective layer that reflects the image light,
A diffusion layer for scattering the light reflected by the reflection layer,
A condenser lens group provided between the diffusion layer and the reflection layer, and a condenser lens group in which a plurality of condenser lenses for condensing light incident through the diffusion layer are arranged;
A screen provided between the condenser lens group and the reflection layer, the absorption layer pattern absorbing light incident from a different direction from the image light. The screen according to claim 1, further comprising a layer having a lower refractive index than each of the constituent materials between the diffusion layer and the condenser lens group and between the condenser lens group and the reflection layer. The screen according to claim 2, wherein the low refractive index layer includes an adhesive. 2. The screen according to claim 1, wherein the condenser lens group is a lenticular lens. The screen according to claim 1, wherein the condenser lens group is a microlens array. 2. The screen according to claim 1, wherein the condenser lens is a transparent cylindrical rod or a spherical bead. 2. The screen according to claim 1, wherein an arrangement pitch of the condenser lenses is smaller than one pixel. The reflective layer has a high reflection characteristic for light in a specific wavelength region corresponding to image light, and has a high transmission characteristic for light in a visible wavelength region excluding at least the specific wavelength region. The screen according to claim 1. 9. The screen according to claim 8, wherein the reflection layer comprises an optical multilayer film in which a high refractive index layer and a low refractive index layer having a lower refractive index are alternately laminated. 9. The screen according to claim 8, further comprising an absorption layer that absorbs light transmitted through the reflection layer. 9. The screen according to claim 8, 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,
A diffusion layer forming step of forming a diffusion layer on the incident side of the converging light of the condenser lens group in which a plurality of condenser lenses are arranged;
Forming a photosensitive resin layer containing a light absorbing agent on the exit side of the converging light of the condenser lens group,
An exposure step of irradiating the photosensitive resin layer with light from a predetermined position through the diffusion layer and the condenser lens group to expose light;
Removing the exposed portion of the photosensitive resin layer to form an absorption layer pattern,
Forming a reflective layer on the surface of the condenser lens group on which the absorption layer pattern is formed. The diffusion layer forming step includes a step of bonding a diffusion plate serving as a diffusion layer to the condenser lens group using an adhesive having a lower refractive index than the constituent materials of the condenser lens group and the diffusion layer. The method for producing a screen according to claim 12, wherein The method according to claim 12, wherein the predetermined position in the exposing step is set in accordance with an irradiation position of image light. The reflection layer forming step may include a step of bonding a substrate having a reflection layer to the condenser lens group using an adhesive having a lower refractive index than the constituent materials of the condenser lens group and the reflection layer. 13. The method for manufacturing a screen according to claim 12, wherein: 13. The method according to claim 12, wherein the condenser lens group is a lenticular lens or a microlens array. The reflective layer has a high reflection characteristic for light in a specific wavelength region corresponding to image light, and has a high transmission characteristic for light in a visible wavelength region excluding at least the specific wavelength region. A method for manufacturing a screen according to claim 12. 18. The method according to claim 17, wherein the reflection layer comprises an optical multilayer film in which a high refractive index layer and a low refractive index layer having a lower refractive index are alternately laminated. The method according to claim 17, wherein the reflection layer is formed on a substrate having an absorption layer.

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