JP2018165749A - Transmission type screen and rear projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission type screen that can reduce transmission of video light to a pattern layer, the transmission type screen capable of suppressing a reduction in visibility of a pattern displayed by the pattern layer while suppressing an increase in thickness of the transmission type screen.SOLUTION: The present invention provides a transmission type screen that transmits video light projected from a light source therethrough toward an observation side to display video, the transmission type screen including a pattern layer and a metal thin film layer arranged on a surface of the pattern layer toward the light source, where the pattern layer and the metal thin film layer have a light diffusion layer that has pattern-like openings in areas where the layers overlap with each other in a plan view, and is arranged between the pattern layer and the metal thin film layer and in areas overlapping with the openings in the plan view.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmissive screen that displays video by transmitting image light projected from one surface side to the other surface side, and a rear projection display device that includes the transmissive screen.

  As one of display devices that display video and images, there is a rear projection display device. The rear projection display device includes a transmissive screen that transmits image light projected from the rear side, and is also referred to as a rear projection display device. For example, as disclosed in Patent Documents 1 to 3, this transmissive screen can be viewed by an observer by emitting video light projected from a video light source to the side opposite to the side where the video light source is provided. Video can be displayed.

  In recent years, a technique has been proposed in which a predetermined pattern is displayed from the observation side even when image light is not projected onto a transmissive screen. With this technique, the design of the transmission screen can be improved. For example, Patent Documents 1 and 2 disclose a configuration in which a pattern layer for displaying a predetermined pattern is arranged on the observation side surface of the transmission screen. In addition, it is disclosed that a large number of openings are formed in a plan view in the picture layer arranged on the observation side of the transmission screen. By forming a large number of openings in a plan view of the picture layer, when image light is projected, it is possible to transmit the image light from the openings and display an image on the observation side.

JP 2005-37818 A JP 2007-524115 A JP 2013-2183883 A

  The transmissive screen as described above has a problem in that when image light is projected, the image light is transmitted through the pattern layer, thereby reducing the visibility of the pattern layer. As a technique for suppressing such a decrease in the visibility of the picture layer, a technique has been proposed in which a light shielding layer having a light shielding property is provided on the light source side surface of the picture layer. Patent Document 1 discloses, for example, a light shielding layer having a black pigment and a light shielding layer having a white pigment. On the other hand, when a light shielding layer having a black pigment is provided on the light source side surface of the pattern layer, there is a problem that the color of the pattern displayed by the pattern layer becomes dark. In addition, since the light shielding layer having a white pigment is relatively poor in light shielding properties, it is necessary to increase the thickness of the light shielding layer in order to perform a desired function, and there is a problem that the thickness of the transmission screen itself increases. .

  The inventors of the present invention have repeatedly studied a light-shielding layer that can suppress a decrease in visibility such that the color of a picture displayed by the picture layer becomes dark without increasing the thickness. As a result, it has been found that by using a metal thin film layer as the light shielding layer, it is possible to suppress a reduction in visibility such that the color of the pattern displayed by the pattern layer becomes dark without increasing the thickness. Therefore, the present inventors have further studied a transmission type screen using a metal thin film layer as a light shielding layer. As a result, when the metal thin film layer is disposed on the light source side surface of the pattern layer, a new problem has been discovered in which the visibility of the pattern displayed by the pattern layer is lowered due to the light reflectivity of the metal thin film layer.

  The present invention has been made in view of the above problems, and is a transmissive screen capable of suppressing the transmission of image light to the pattern layer, while suppressing an increase in the thickness of the transmissive screen. The main object is to provide a transmissive screen capable of suppressing a decrease in the visibility of a picture displayed by the above.

  The present invention is a transmissive screen that displays image by transmitting image light projected from the light source side to the observation side, and includes a pattern layer, and a metal thin film layer disposed on the light source side surface of the pattern layer. The pattern layer and the metal thin film layer have a pattern-shaped opening in a region overlapping in plan view, and a region overlapping between the pattern layer and the metal thin film layer and in plan view. A transmissive screen having a light diffusing layer disposed on the surface is provided.

  According to the present invention, by providing a metal thin film layer at a predetermined position, it is a transmissive screen that can suppress the transmission of image light to the picture layer, while suppressing an increase in the thickness of the transmissive screen. Thus, it is possible to provide a transmission screen capable of suppressing a decrease in the visibility of the pattern displayed by the pattern layer.

  In the present invention, the light diffusion layer disposed in a region overlapping the opening in plan view is a first light diffusion portion, and the light diffusion layer disposed between the pattern layer and the metal thin film layer is When the second light diffusion portion is used, it is preferable that the first light diffusion portion and the second light diffusion portion are integrated. The displacement of the metal thin film layer, the picture layer, and the light diffusion layer disposed therebetween can be suppressed, and a high-quality transmission screen can be obtained.

  In the present invention, the light diffusion layer disposed in a region overlapping the opening in plan view is a first light diffusion portion, and the light diffusion layer disposed between the pattern layer and the metal thin film layer is When the second light diffusing unit is used, it is preferable that the first light diffusing unit and the second light diffusing unit are separate. The light diffusing performance of the first light diffusing unit and the second light diffusing unit can be appropriately adjusted according to the use of the transmission screen.

  In the present invention, it is a transmissive screen that displays image by transmitting image light projected from the light source side to the observation side, and includes the pattern layer, the metal thin film layer, and the light diffusion layer. It is preferable that the laminated body has a curved shape in which the observation side surface forms a three-dimensional curved surface. The transmission screen of the present invention can be used in a wide range of fields.

  In the present invention, it is preferable that the laminate includes a Fresnel lens layer disposed on the light source side surface, and the Fresnel lens layer preferably has a curved shape in which the observation side surface forms a three-dimensional curved surface. By having the Fresnel lens layer, it is possible to reduce in-plane variations in brightness of an image observed by an observer, in particular, an image observed from an oblique direction of a transmission screen by the observer.

  The present invention also provides a rear projection display device comprising an image light source that emits image light and the above-described transmission screen that transmits the image light from the image light source and emits the image light to the observation side.

  According to the present invention, it is a rear projection type display device that can suppress transmission of image light to the picture layer by having the above-described transmission type screen, while suppressing an increase in the thickness of the transmission type screen. Thus, a rear projection display device capable of suppressing a decrease in the visibility of the pattern displayed by the pattern layer can be obtained.

  The present invention is a transmissive screen capable of suppressing the transmission of image light to the pattern layer, and reduces the visibility of the pattern displayed by the pattern layer while suppressing an increase in the thickness of the transmissive screen. There exists an effect that the transmission type screen which can be controlled can be provided.

It is explanatory drawing for demonstrating the transmission type screen of this invention. It is explanatory drawing for demonstrating the transmission type screen of this invention. It is explanatory drawing for demonstrating the transmission type screen of this invention. It is explanatory drawing for demonstrating the transmission type screen of this invention. It is explanatory drawing for demonstrating the transmission type screen of this invention. It is explanatory drawing for demonstrating the transmission type screen of this invention. It is explanatory drawing for demonstrating the transmission type screen of this invention. It is explanatory drawing for demonstrating the conventional transmissive screen. It is explanatory drawing for demonstrating the conventional transmissive screen. It is explanatory drawing for demonstrating the conventional transmissive screen.

  The transmission screen and the rear projection display device of the present invention will be described below.

I. Transmission screen The transmission screen of the present invention is a member that displays image by transmitting image light projected from the light source side to the observation side, and is disposed on the pattern layer and the light source side surface of the pattern layer. The pattern layer and the metal thin film layer have a pattern-shaped opening in a region overlapping in plan view, and between the pattern layer and the metal thin film layer, and the opening It is a member having a light diffusion layer arranged in a region overlapping in plan view.

  At least a part of the laminate having the pattern layer and the metal thin film layer constituting the transmission screen of the present invention may be curved. Specifically, the observation side surface may have a curved shape forming a three-dimensional curved surface. Here, the three-dimensional curved surface is, for example, a three-dimensional curved surface that is convex toward the viewer side, a three-dimensional curved surface that is convex toward the light source side, and a curved surface that is convex toward the viewer side at different positions and the light source side. And a three-dimensional curved surface that combines both a convex surface and a curved surface. On the other hand, the laminate need not be curved. In this case, the laminated body has a planar shape. The drawings other than FIG. 6 shown in this specification are examples in which the transmissive screen is not curved.

  The transmission screen of the present invention will be described below with reference to the drawings. However, the present invention can be implemented in many different modes, and should not be construed as being limited to the description of the embodiments described below. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part as compared with the embodiments for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited thereto. It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

FIG. 1A is a schematic diagram showing an example of a rear projection display device using the transmission screen of the present invention. Moreover, FIG.1 (b) is the sectional view on the AA line of Fig.1 (a). As illustrated in FIG. 1A, the transmission screen of the present invention transmits the image light L ₁₀ projected from the image light source 10 to the other surface side from one surface side of the transmission screen 100. Can be displayed. When the observer 20 observes the transmissive screen 100 from the other surface side, the observer 20 can visually recognize the image.

As shown in FIGS. 1A and 1B, the transmission screen 100 of the present invention can display a predetermined picture from the observation side even when no image light is projected. Further, the transmissive screen 100, as shown in FIG enlarged view and in FIG. 1 (a) 1 (b) , by having a plan view multiple openings R1, when the projected image light L _10, from the opening R1 passes through the image light L ₁₀ and it is possible to display an image on the viewing side.

  The transmissive screen 100 of the present invention shown in FIGS. 1A and 1B has the following configuration. That is, the transmission screen 100 of the present invention shown in FIGS. 1A and 1B includes a picture layer 1, a metal thin film layer 3 disposed on the light source side of the picture layer 1, the picture layer 1 and the metal. A light diffusion layer 2 disposed between the thin film layers 3. Moreover, the pattern layer 1 and the metal thin film layer 3 have a pattern-shaped opening R1 in a region overlapping in plan view. A transmission screen 100 shown in FIGS. 1A and 1B is an example having a configuration in which each member is supported by a transparent base material 4.

According to the present invention, since the transmission screen has the above-described configuration, the following effects can be obtained. First, the conventional transmissive screen has a problem that when image light is projected, the image light is transmitted through the pattern layer, thereby reducing visibility. Such visibility technique for suppressing a reduction in, for example, as shown in FIG. 8 (b), the light source side surface of the pattern layer 1, a light shielding layer 5B having a black pigment is provided, the image light L ₁₀ A technique for suppressing transmission through the picture layer 1 has been proposed. Case of providing the light-shielding layer 5B containing a black pigment on the light source side of the pattern layer 1, while it is possible to image light L ₁₀ is sufficiently prevented from passing through the pattern layer 1, the picture of the picture layer 1 is displayed There arises a problem that the hue is darkly displayed under the influence of the light-shielding layer 5B that exhibits black. Further, as another technique, for example, as shown in FIG. 8C, a light-shielding layer 5W having a white pigment is provided on the light source side surface of the pattern layer 1, and the pattern displayed by the pattern layer 1 is affected. without giving, a technique for suppressing the image light L ₁₀ is transmitted through the pattern layer 1 has been proposed. However, the light-shielding layer 5W that exhibits white due to the white pigment tends to have lower light-shielding properties than the light-shielding layer 5B that exhibits black. Therefore, in order to suppress the transmission of image light L _10, it is necessary to relatively thick design the thickness of the light shielding layer 5W, problem thickness of the transmissive screen 100 'itself becomes thick occurs. FIG. 8A is a schematic diagram showing an example of a rear projection display device using a conventional transmission screen. FIGS. 8B and 8C correspond to the cross-sectional view taken along the line A′-A ′ of FIG. 8A, and show the configuration of a conventional transmission screen, respectively. The members denoted by reference numeral 6 in FIGS. 8B and 8C indicate the light transmitting member disposed in the opening R1, and the other unexplained reference numerals are the same as those in FIGS. 1A to 1C. Since it can be the same, the description here is omitted.

Incidentally, Patent Document 1 discloses the use of a metal thin film for the shielding layer. However, the metal thin film described in Patent Document 1 is an example of a material that shields light, and is not different from a shielding layer using a black pigment. That is, the metal thin film disclosed in Patent Document 1 is merely disclosed as a material having a function of shielding light. The inventors of the present invention have repeatedly studied based on the above findings. As a result, the following new issues were discovered. That is, first, as shown in FIG. 9, in the case of a transmissive screen 100 ′ using the metal thin film layer 3 on the light source side of the pattern layer 1, the external light L ₂₀ irradiated from the observer 20 side is reflective. The reflected light L ₂₃ reflected by the high metal thin film layer 3 and the reflected light L ₂₁ reflected by the pattern layer 1 are obtained. At this time, there is a problem that the external light L ₂₀ incident on the highly reflective metal thin film layer 3 is reflected on the metal thin film layer 3. Specifically, for example, when a light source that irradiates the external light L ₂₀ is reflected on the metal thin film layer 3, a region where the light source is reflected on the surface of the metal thin film layer 3 becomes very bright. Then, the visibility of the picture to be displayed by the pattern layer 1, the external light L ₂₀ that reflected on the metal thin film layer 3, decreases.

According to the present invention, as shown in FIG. 1B, by providing the light diffusion layer 2 between the pattern layer 1 and the metal thin film layer 3, the light L ₂₀ incident from the observation side is made of metal. Light L ₂₃ incident on the thin film layer 3 can be diffused. Therefore, for example, as shown in FIG. 9, it can be suppressed that the external light L ₂₀ is reflected on the metal thin film layer 3 as it is. Accordingly, as shown in FIG. 1 (b), according to the external light L ₂₀ that reflected on the metal thin film layer 3, it is possible to suppress a decrease in visibility of the picture to picture layer 1 is displayed.

In addition, as a conventional transmissive screen, as shown to Fig.10 (a), there exists a structure by which the light-diffusion layer 2 is arrange | positioned on the surface at the side of observation of transmissive screen 100 '. As shown in FIG. 10 (a) spreading, if the light diffusion layer 2 is disposed on the observation side surface of the transmissive screen 100 ', image light L ₁₀ is transmitted through the opening portion R1 by the light diffusing layer 2 Is done. Thereby, when projected on the transmissive screen 100 'the image light L ₁₀ as shown in FIG. 10 (a) it is believed to improve the visibility of the image by an observer. On the other hand, as shown in FIG. 10A, when the light diffusion layer 2 is disposed on the observation side surface of the transmission screen 100 ′, the external light L ₂₀ incident on the transmission screen 100 ′ from the observation side. Is reflected by the metal thin film layer 3 having a light shielding function and diffused by the light diffusion layer 2 when it is emitted from the surface on the side where the external light L ₂₀ is incident. Then, when the image light L ₁₀ is not projected onto the transmissive screen 100 ′, the pattern displayed by the optical function layer 1 having the pattern function becomes white due to the external light L ₂₀ diffused by the light diffusion layer 2. It may appear blurred.

Further, as a conventional transmissive screen, as shown in FIG. 10B, there is a configuration in which the light diffusion layer 2 is disposed on the light source side surface of the transmissive screen 100 ′. As shown in FIG. 10 (b), 'when placed on the light source side surface of the transmissive screen 100' light diffusion layer 2 is transmissive screen 100 image light L ₁₀ incident on the by the light diffusing layer 2 Diffused. Thereby, when a part of the image light L ₁₀ that should be incident on the opening portion R1 becomes stray light, which the stray light is incident to the metal film layer formation region where the metal thin film layer 3 is formed adjacent to the opening R1 There is. At this time, the light incident on the light shielding layer forming region is reflected by the light shielding layer and is emitted from the light source side of the transmissive screen 100 ′. When the above-mentioned problems occur, the transmission efficiency of the image light transmission type screen is lowered, and the visibility of the image light may be impaired.

  Hereinafter, the transmission screen of the present invention will be described in detail.

1. Metal thin film layer The metal thin film layer in this invention is a member arrange | positioned at the surface at the side of the light source of the pattern layer mentioned later. Further, the metal thin film layer has an opening in a pattern shape, and the opening is arranged in a region overlapping with an opening of a pattern layer described later in plan view.

  In the present invention, the pattern layer and the metal thin film layer have a pattern-like opening in a region overlapping in plan view. Here, “the pattern layer and the metal thin film layer have a pattern-shaped opening in a region overlapping in plan view” means, for example, an opening formed in the pattern layer 1 as shown in FIG. This means that R1 and the opening R1 formed in the metal thin film layer 3 overlap in plan view. Moreover, in this invention, as shown by the arrow of FIG.2 (b), the edge part by the side of opening R1 of the pattern layer 1 and the edge part by the side of opening R1 of the metal thin film layer 3 are planar view. The end of the adjacent picture layer 1 on the opening R1 side and the end of the metal thin film layer 3 on the opening R1 side, as indicated by the arrows in FIG. It does not have to overlap in plan view.

  In this invention, it is preferable that the edge part by the side of the opening part of an adjacent metal thin film layer has overlapped with the edge part by the side of the opening part of an adjacent pattern layer on planar view. When image light is projected onto the transmissive screen of the present invention, it is possible to suppress the occurrence of a problem that the image light is emitted through the pattern layer and visibility is lowered. In addition, when image light is not projected onto the transmissive screen of the present invention, it is possible to suppress the occurrence of a problem that the metal thin film layer is visible from the observation side and visibility is reduced. As shown in FIG. 3, in the metal thin film layer 3, when a region overlapping the pattern layer 1 in plan view is indicated by a symbol R2a, and a region not overlapping the pattern layer 1 in plan view is indicated by a symbol R2b, for example, the metal thin film layer The length of the region R2b where 3 does not overlap with the pattern layer 1 in plan view is preferably within a range of 20 μm or less, more preferably within a range of 10 μm or less, and particularly within a range of 5 μm or less. Is preferred. Note that reference numerals that are not described in FIG. 3 can be the same as those in FIG.

  As shown in FIGS. 1A and 1B, a large number of patterned openings in the metal thin film layer in the present invention are usually formed in plan view. In the present invention, by forming a large number of patterned openings, it is possible to transmit the image light from the openings to the observation side when image light is projected onto the transmissive screen. Thereby, the observer can visually recognize a predetermined image by the image light transmitted to the observation side.

  In the plan view of the metal thin film layer, the area ratio between the area of the opening and the other area is such that when the image light is projected onto the transmission screen, the image light is transmitted to the observation side, and the observer views the image. The area ratio is such that it can be sufficiently visually recognized, and when the image light is not projected onto the transmissive screen, the visibility of the pattern displayed by the pattern layer can be sufficiently secured. An area ratio is preferred. Therefore, in the plan view of the metal thin film layer, the area ratio between the region of the opening and the other region can be appropriately adjusted according to the use of the transmission screen. As the specific area ratio, for example, the region of the opening and the other region are preferably in the range of 1: 6 to 6: 1, and more preferably 1: 4 to 4: 1. It is preferably within the range, and particularly preferably within the range of 1: 4 or more and 1: 1 or less.

  The plan view shape of the pattern-like opening in the metal thin film layer may be a shape that can exhibit the function of sufficiently transmitting the image light to the observation side when the image light is projected onto the transmission screen. preferable. Specific examples of the planar shape of the opening include a circular shape, a rectangular shape, and a lattice shape. Usually, it is circular. In addition, the circular shape here includes an elliptical shape and the like. Further, a large number of openings in the metal thin film layer are usually formed. Therefore, the planar view shape of many opening parts may be the same, and may differ.

  The size of the planar opening of the pattern-like opening in the metal thin film layer is preferably large enough to satisfy the area ratio described above. As a specific size when the shape of the opening in plan view is circular, for example, the diameter can be 5 mm or less, particularly 0.2 mm or less, and particularly 0.05 mm or less. Moreover, the magnitude | size of an opening part can be 0.01 mm or more. By setting the size of the opening within the above range, it is possible to prevent the opening from being visually recognized by the observer and the visibility of the picture displayed by the picture layer from being lowered. Further, the interval between the adjacent openings can be appropriately adjusted according to the size of the opening, but it is preferable to set the interval between the adjacent openings so as to satisfy a predetermined opening ratio, for example. . Specifically, the aperture ratio can be 50% or less, particularly 25% or less. The aperture ratio can be 5% or more. In addition, the space | interval of an adjacent opening part here points out the distance shown with the code | symbol W of Fig.1 (a), for example. On the other hand, when the planar view shape of the pattern-like opening in the metal thin film layer is a lattice, as a specific size of the opening, for example, the length of one side of the lattice can be 4 mm or less. . Moreover, when the planar view shape of the pattern-shaped opening part in a metal thin film layer is a strip shape, as a specific magnitude | size of an opening part, the width of a strip shall be 4 mm or less, for example, and the adjacent strip-shaped opening part Can be 4 mm or less.

The metal thin film layer in the present invention is a member having a light shielding function for shielding image light projected from a light source. Here, the “light-shielding function for shielding the image light projected from the light source” means that, for example, the image light projected from the light source is transmitted through the metal thin film layer so that the image light is transmitted through the pattern layer described later. It means a light shielding function that does not deteriorate the visibility of video displayed by video light. Accordingly, the specific light-shielding function varies depending on the use of the transmissive screen, but for example, the total light transmittance is preferably within 10% or less, and more preferably within 3% or less. It is preferable that it is within a range of 1% or less. Further, the light blocking function here is preferably a function capable of blocking the image light projected on the transmissive screen. Therefore, the total light transmittance described above is determined according to the wavelength of the image light. Therefore, the light shielding function can be defined by, for example, spectral transmittance. The numerical range defined by the spectral transmittance can be the same as the numerical range of the total light transmittance described above. The spectral transmittance can be measured using a V-7100 UV-visible spectrophotometer manufactured by JASCO Corporation. In addition to the spectral transmittance, the light shielding function can be defined by the Y value or L ^* value. The Y value and L ^* value can be calculated from the spectral transmittance, and can be measured using a CS-100A color luminance meter manufactured by Konica Minolta. Note that the method for calculating the Y value and the L ^* value from the spectral transmittance can be the same as the method for calculating from a known equation, and thus the description thereof is omitted here.

The metal thin film layer in the present invention is preferably a member having a reflection function capable of reflecting light incident from the observation side when image light is not projected from the light source. Here, the “reflecting function capable of reflecting light incident from the observation side” of the metal thin film layer preferably has, for example, a reflection intensity L ^* value in the range of 50 or more, particularly 70 or more. It is preferable to be within the range. The L ^* value can be obtained by measuring the total reflectance of the metal thin film layer.

  The material of the metal thin film layer in the present invention is preferably a material that can form a predetermined opening and can have a desired thickness described later. In the present invention, a material capable of forming a metal thin film layer having a reflective color can be selected, and among them, a material capable of forming a white metal thin film layer is selected. It is preferable. It is because it can suppress that the visibility of a pattern of the pattern layer mentioned later influences the hue of a metal thin film layer, and a visibility falls. Examples of the material for such a metal thin film layer include tin, indium, chromium, aluminum, nickel, silver, platinum, and iron. In addition, an alloy containing at least one of the metal materials described above can be used for the metal thin film layer. When the transmissive screen of the present invention is curved so as to have a curved surface, it is preferable to use tin, indium, chromium or the like as the material of the metal thin film layer. This is because flexibility can be imparted to the metal thin film layer, and the metal thin film layer can follow the curved surface.

  The thickness of the metal thin film layer is preferably such a thickness that a desired light shielding function can be exhibited. Further, from the viewpoint of being able to exhibit a reflection function capable of reflecting light incident from the observation side, for example, the thickness of the metal thin film layer is preferably within a range of 10 nm or more. Furthermore, in the present invention, it is preferable that the thickness is such that a pattern-like opening can be formed, that is, a thickness that enables drilling. From this viewpoint, for example, the metal thin film layer The thickness is preferably in the range of 5 mm or less, and more preferably in the range of 1 mm or less. Furthermore, when the metal thin film layer in the present invention is curved so as to have a curved surface, the metal thin film layer is preferably flexible enough to follow the curved surface. For example, the thickness of the metal thin film layer is preferably in the range of 10 nm to 500 nm, and more preferably in the range of 10 nm to 100 nm.

  In the present invention, the observation side surface of the metal thin film layer may have an uneven shape. This is because light incident from the observation side can be diffused when image light is not projected onto the transmission screen of the present invention. In addition, about the magnitude | size, depth, etc. of the uneven | corrugated shape formed in the surface of a metal thin film layer, it can adjust suitably according to the use etc. of the transmission type screen of this invention. Since a generally known method can be adopted as a method for forming a concavo-convex shape on the surface of the metal thin film layer, description thereof is omitted here.

  The method for forming the metal thin film layer in the present invention may be any method that can form a patterned opening, and a general method can be employed. For example, an evaporation method such as a vacuum evaporation method, a sputtering method, an ion plating method, and the like can be given. Among these, the vacuum deposition method is preferable in that the metal thin film layer can be formed with a relatively thin thickness and can be formed at low cost. The conditions for the vapor deposition can be appropriately set according to the melting temperature and the evaporation temperature of the metal used for the metal thin film layer. In the present invention, in addition to the above-described forming method, for example, a method of applying a paste containing a metal material constituting the metal thin film layer, a plating method using a metal constituting the metal thin film layer, a transparent substrate Examples thereof include a method of arranging a metal foil on the top and patterning by etching, a method of adhering a patterned metal foil on a transparent substrate, and the like.

2. Light Diffusing Layer The light diffusing portion in the present invention is a member disposed between the pattern layer and the metal thin film layer and in the opening.

  In the light diffusing layer in the present invention, for example, the light diffusing layer in a region overlapping with the opening in plan view is used as the first light diffusing portion, and the light diffusing layer in the region overlapping with the closed portion other than the opening in plan view is used as the second light. When the diffusion portion is used, the first mode in which the first light diffusion portion and the second light diffusion portion are integrally formed, and the light diffusion layer in a region overlapping the opening R1 in plan view as shown in FIG. 2 is the first light diffusing portion 2a, and the light diffusing layer 2 in a region overlapping the closed portion R2 other than the opening R1 in plan view is the second light diffusing portion 2b, the first light diffusing portion 2a and the second light It can be divided into a second mode in which the diffusing unit 2b is a separate body.

  Hereinafter, the light diffusion layer in the present invention will be described separately for the first aspect and the second aspect.

(1) 1st aspect The light-diffusion layer of this aspect was arrange | positioned between the pattern layer and the metal thin film layer by making the light-diffusion layer arrange | positioned in the area | region which overlaps with an opening planarly into a 1st light-diffusion part. When the light diffusion layer is the second light diffusion portion, the first light diffusion portion and the second light diffusion portion are integrally formed. Specifically, as shown in FIG. 1 (b), between the picture layer 1 and the metal thin film layer 3, the opening R1 of the picture layer 1 and the metal thin film layer 3 in the plan view, and the opening described above. It is the aspect formed integrally in closing part R2 other than part R1. Here, “integrated” means that the first light diffusion portion and the second diffusion portion are continuously formed as one member. In this aspect, since the first light diffusing portion and the second light diffusing portion are integrated, occurrence of misalignment when the light diffusing layer is provided in a pattern on the metal thin film layer can be suppressed. For this reason, it is possible to suppress the occurrence of displacement in the plan view between the pattern layer and the metal thin film layer when the pattern layer is provided on the light diffusion layer. Therefore, the configuration of this embodiment is preferable from the viewpoint of manufacturing a transmission screen.

  In addition, the light diffusion layer in this aspect is one member in which the first light diffusion portion and the second light diffusion portion are integrally formed. Therefore, hereinafter, the first light diffusion portion and the second light diffusion portion are collectively described as a light diffusion layer.

  The light diffusing layer in this embodiment is usually a light transmissive member. The light transmittance of the light diffusing layer is preferably light transmissive so that the image light can be transmitted through the light diffusing layer when image light is projected onto the transmissive screen of this aspect. Here, as a specific light transmittance of the light diffusion layer, for example, the total light transmittance is preferably within a range of 60% or more, and more preferably within a range of 80% or more, particularly 90. % Is preferably within the range of at least%. When image light is projected onto the transmissive screen, more image light can be emitted to the observation side, so that the visibility of the image displayed by the image light is improved. In addition, the total light transmittance of a light-diffusion layer can be measured by the method based on JISK7361-1: 1997, for example.

  The light diffusion layer in this embodiment can be obtained, for example, by dispersing a particulate light diffusion material in a transparent resin. In this embodiment, a case where a transparent resin is used will be described. However, glass may be used instead of the transparent resin, and it is also possible to use a fluid such as liquid or liquid crystal as well as a solid. is there.

  The particulate light diffusing material and the transparent resin have different refractive indexes. As a refractive index of transparent resin, it can be in the range of 1.45 or more and 1.60 or less, for example. On the other hand, the refractive index of the light diffusing material only needs to have a predetermined difference from the refractive index of the transparent resin described above, and can be appropriately selected according to the refractive index of the transparent resin. The refractive index of the light diffusing material is preferably selected within the range of 1.30 to 2.40, and more preferably within the range of 1.40 to 1.60. The absolute value of the difference in refractive index between the transparent resin and the light diffusing material is preferably in the range of 0.01 or more and 0.20 or less, for example. When the absolute value of the refractive index difference is within the above range, a transmission screen having a desired haze value can be obtained.

  The transparent resin used for the light diffusion layer may be, for example, a resin having optical transparency, and specifically, a polyethylene terephthalate resin, a polycarbonate resin, a methyl methacrylate / styrene resin, a methyl methacrylate / butadiene / styrene. Examples thereof include resins, acrylic resins, triacetyl cellulose resins, polyethylene naphthalate resins, and the like. In addition, one or more kinds of various additives such as a crosslinking agent, an ultraviolet absorber, an antioxidant, an antistatic agent, a flame retardant, a plasticizer, and a colorant are added to these transparent resins as necessary. May be.

  Examples of the light diffusing material used in the light diffusing layer include organic fillers such as plastic beads, and materials having high transparency are particularly preferable. As the plastic beads, for example, those made of melamine resin, acrylic resin, acrylonitrile styrene resin, polycarbonate resin, etc. can be applied. Silicon-based beads can also be used as a light diffusing material. Furthermore, these light diffusing materials can be appropriately selected according to the desired diffusion function and the like, and can be used by combining them at a predetermined ratio.

  The particulate light diffusing material includes, for example, a light diffusing material having a shape such as a spherical shape, a flat shape, an indeterminate shape, a star shape, and a gold flat sugar shape. The particulate light diffusing material may be, for example, hollow particles or core-shell particles.

  The average particle diameter of the particulate light diffusing material is, for example, preferably in the range of 1 μm to 50 μm, and more preferably in the range of 5 μm to 30 μm. When the average particle diameter of the particulate light diffusing material has the above lower limit, the light diffusing function can be sufficiently exerted, and the visibility of the image viewed through the image light through the light diffusing layer can be reduced. Can be suppressed. Moreover, since the average particle diameter of a particulate light-diffusion material has the said upper limit, the fall of the light transmittance of a light-diffusion layer can be suppressed, and the fall of the contrast by glare can be suppressed. In addition, since the average particle diameter of a light-diffusion material can be measured by a general method, description here is abbreviate | omitted.

  The content of the particulate light diffusing material in the light diffusing layer includes the refractive index of the transparent resin used in the light diffusing layer, the refractive index of the light diffusing material, the average particle diameter of the particulate light diffusing material, and the thickness of the light diffusing layer. The particulate light diffusing material can be appropriately adjusted according to the dispersion state in the transparent resin. For example, with respect to 100 parts by mass of the transparent resin, the particulate light diffusing material can be within a range of 0.3 parts by mass or more and 20 parts by mass or less, and particularly, within a range of 1 part by mass or more and 10 parts by mass or less. It is preferable that When the content of the particulate light diffusing material in the light diffusing layer has the above lower limit, the light diffusing layer can exhibit a desired light diffusing function. Moreover, when the content of the particulate light diffusing material in the light diffusion layer has the above upper limit, it is possible to suppress a decrease in light transmittance of the light diffusion layer.

  The thickness of the light diffusion layer can be appropriately adjusted according to the average particle diameter and content of the particulate light diffusion material used for the light diffusion layer, the refractive index of the transparent resin, the refractive index of the light diffusion material, and the like. In this aspect, it is preferable that the thickness of the light diffusion layer is such that a desired light diffusion function can be exhibited. The specific thickness of the light diffusion layer is, for example, preferably in the range of 0.05 mm to 1.5 mm, and more preferably in the range of 0.1 mm to 1.0 mm. When the thickness of the light diffusion layer has the above lower limit, the light diffusion layer can exhibit a desired light diffusion function. In addition, since the thickness of the light diffusion layer has the above upper limit, it suppresses a decrease in visibility such as a blurred image or a reduced resolution displayed when image light is projected onto a transmissive screen. Can do. Here, the thickness of the light diffusion layer refers to a distance at which the length in the thickness direction of the light diffusion layer is maximized.

  The light diffusion layer preferably has a predetermined haze value. The specific haze value of the light diffusion layer is preferably in the range of 1% to 60%, for example. When the haze value of the light diffusion layer is within the above range, it is possible to suppress a decrease in visibility such as a blurred image displayed when image light is projected onto the transmissive screen. In addition, the haze value of a light-diffusion layer can be measured based on JISK7105: 1981, for example.

  The method for forming the light diffusion layer in this embodiment is not particularly limited as long as it is a method capable of forming a light diffusion layer having desired light diffusion performance, and generally known methods can be employed. For example, after forming a metal thin film layer having a pattern-shaped opening on a transparent substrate, a gravure coat, a paint in which a particulate light diffusing material is dispersed in a transparent resin so as to cover the metal thin film layer, Examples of the method include coating using a known method such as roll coating, bead coating, spray coating, and inkjet, and drying.

(2) Second Aspect As shown in FIG. 4, the light diffusing layer in this aspect has a light diffusing layer 2 in a region overlapping the opening R1 in plan view as a first light diffusing portion 2a, and is closed except for the opening R1. When the light diffusion layer 2 in a region overlapping the portion R2 in plan view is the second light diffusion portion 2b, the first light diffusion portion 2a and the second light diffusion portion 2b are separate bodies.

  As shown in FIG. 4, the transmissive screen according to this aspect has a light diffusion layer 2 disposed in a region overlapping the opening R1 of the pattern layer 1 and the metal thin film layer 3 in plan view as a first light diffusion portion 2a. When the light diffusion layer 2 disposed between the pattern layer 1 and the metal thin film layer 3, that is, in the region R2 where the pattern layer 1 and the metal thin film layer 3 overlap in plan view is the second light diffusion portion 2b, The light diffusion part 2a and the second light diffusion part 2b can be formed as separate bodies. As described above, by providing the first light diffusion portion 2a and the second light diffusion portion 2b as separate bodies, the light diffusion performance of the first light diffusion portion 2a and the light diffusion performance of the second light diffusion portion 2b are obtained. Can be appropriately adjusted according to the use of the transmission screen 100 of this embodiment. Specifically, it is as follows.

For example, when the light diffusing performance of the first light diffusing unit 2a shown in FIG. 4 is enhanced, when the image light L10 from the image light source ₁₀ is projected onto the transmissive screen 100, the first light diffusing unit 2b. There can be sufficiently diffuse the image light L _10. Therefore, it is possible to visually recognize the image displayed by the image light in a wide range on the observation side of the transmission screen. On the other hand, if the enhanced light diffusion capability possessed by the second light diffusion unit 2b, when the transmissive screen 100 does not project the image light L ₁₀ from the image light source 10, second light diffusing portion 2b observed External light incident from the side can be sufficiently diffused. Therefore, it is possible to visually recognize the pattern displayed by the pattern layer in a wide range on the observation side of the transmission screen.

For example, when the light diffusion performance of the first light diffusing unit 2 a shown in FIG. 4 is suppressed, the first light diffusion is performed when the image light L ₁₀ from the image light source ₁₀ is projected onto the transmission screen 100. part 2a can suppress the diffusion of the image light L _10. Therefore, it is possible to visually recognize the image displayed by the image light in a limited range on the observation side of the transmission screen. On the other hand, if with reduced light diffusing performance with the second light diffusion unit 2b, when the transmissive screen 100 does not project the image light L ₁₀ from the image light source 10, the second light diffusing portion 2b, Diffusion of external light incident from the observation side can be suppressed. Therefore, it is possible to visually recognize the pattern displayed by the pattern layer within a limited range on the observation side of the transmission screen.

  Furthermore, as shown in FIG. 4, in the transmission screen of this aspect, the light diffusion layer is composed of a first light diffusion portion and a second light diffusion portion, and the first light diffusion portion and the second light diffusion portion are separated. As a result, the following effects can be obtained. That is, the light diffusion layer is not easily affected by the difference in moldability of each member constituting the transmissive screen. Specifically, the light diffusing layer is not easily damaged such as tearing when the transmission screen is three-dimensionally molded. Also, when the light diffusing layer is integrated, the shape of each member is distorted. Can be suppressed.

  Hereinafter, the first light diffusing unit and the second light diffusing unit in this aspect will be described separately.

(A) 1st light-diffusion part The 1st light-diffusion part in this aspect says the light-diffusion layer of the area | region which overlaps with an opening part by planar view. Here, the “region overlapping the opening in plan view” refers to a region overlapping in plan view both the opening of the pattern layer and the opening of the metal thin film layer. Specifically, it refers to the region indicated by the symbol R1 in FIG.

  About the light transmittance, material, etc. of the 1st light-diffusion part in this aspect, since it can be made to be the same as that of the content of the light-diffusion layer described in the item of the said (1) 1st aspect, description here Is omitted.

  The haze value of the first light diffusing portion in this aspect can be appropriately adjusted according to the use of the transmissive screen. Specifically, when the image light is projected from the image light source and transmitted to the observation side, the transmission type screen can be properly used depending on how much the image light is diffused. For example, if the haze value is increased, the image light transmitted to the observation side can be sufficiently diffused, so that the image displayed by the image light can be viewed in a wide range on the observation side of the transmission screen. Become. On the other hand, if the haze value is lowered, the diffusion of the image light transmitted to the observation side can be suppressed, so that the image displayed by the image light can be viewed within a limited range on the observation side of the transmission screen. It becomes possible. In addition, as a specific haze value when it is desired to increase the haze value, for example, it can be within a range of 30% or more and 99% or less. On the other hand, as a specific haze value when it is desired to reduce the haze value, Can be in the range of 1% to 29%, for example. The haze value of the first light diffusion part can be measured in accordance with, for example, JIS K7105: 1981. Moreover, adjustment of the haze value of a 1st light-diffusion part can be suitably adjusted according to content, thickness, etc. of the light-diffusion material contained in a 1st light-diffusion part, for example.

  The thickness of the first light diffusing portion in this aspect depends on the average particle diameter and content of the particulate light diffusing material used in the first light diffusing portion, the refractive index of the transparent resin, the refractive index of the light diffusing material, and the like. It can be adjusted appropriately. In this aspect, it is preferable that the first light diffusing portion has a thickness that can exhibit a desired light diffusing function. Since the specific thickness of the first light diffusion portion can be the same as the thickness of the light diffusion layer described in the section “(1) First aspect”, description thereof is omitted here.

  The first light diffusing portion in this aspect preferably has a thickness that can exhibit a desired light diffusing function as described above. In this case, for example, as shown in FIG. The thickness of the part 2a may be so thick that it projects from the observation side surface of the adjacent pattern layer 1. 5 shows an example in which the first light diffusion portion 2a protrudes from the observation side surface of the adjacent pattern layer 1, but for example, even if it protrudes from the light source side surface of the adjacent metal thin film layer 3 good.

  In this embodiment, the members are laminated in order from the light source side of the transmission screen, and the first light diffusion portion 2a is formed on the same plane as the metal thin film layer 3 as shown in FIG. In this case, it is preferable that the thickness of the first light diffusing portion 2 a is thicker than at least the thickness of the metal thin film layer 3. On the other hand, although not shown, when the members are laminated in order from the observation side of the transmission screen, and the first light diffusion portion is formed on the same plane as the pattern layer, the thickness of the first light diffusion portion Is preferably at least thicker than the thickness of the pattern layer. This is because the second light diffusing portion 2b can be accurately arranged at a position overlapping the metal thin film layer 3 or the pattern layer 1 in plan view. By suppressing the displacement of the second light diffusion portion 2b, the pattern layer or the metal thin film layer formed on the second light diffusion portion can be formed with high positional accuracy. Therefore, when image light is projected onto the transmission screen of this aspect, occurrence of light leakage of the image light can be suppressed.

  The method for forming the first light diffusion portion in this aspect can be the same as the method for forming the light diffusion layer described in the section “(1) First aspect”. It is possible to previously form the first light diffusing portion and then form the metal thin film layer, the second light diffusing portion, and the pattern layer. Moreover, a metal thin film layer, a 2nd light-diffusion part, and a pattern layer can be formed in a transparent base material, and a 1st light-diffusion part can also be formed after that.

(B) 2nd light-diffusion part The 2nd light-diffusion part in this aspect says the light-diffusion layer of the area | region which overlaps with closed parts other than an opening part by planar view. Here, “a region overlapping with a closed portion other than the opening in plan view” means a region overlapping with a closed portion other than the opening of the pattern layer and the opening of the metal thin film layer in plan view, in other words, at least the pattern layer. And a closed portion that overlaps one of the metal thin film layers in plan view and a region that overlaps in plan view. Specifically, it refers to a region other than the region indicated by reference symbol R1 in FIG. 3, that is, a region indicated by reference symbol R2.

  About the light transmittance, material, formation method, and the like of the second light diffusion portion in this aspect, since it can be the same as the contents of the light diffusion layer described in the section of “(1) First aspect” above, The description here is omitted.

  The haze value of the second light diffusing portion in this aspect can be appropriately adjusted according to the use of the transmissive screen. Specifically, when the image light is not projected from the image light source, the transmissive screen can be properly used depending on how much external light incident from the observation side is diffused. For example, if the haze value is increased, the external light incident from the observation side can be sufficiently diffused, so that the pattern displayed by the pattern layer can be viewed in a wide range on the observation side of the transmission screen. Become. On the other hand, if the haze value is lowered, it is possible to suppress the diffusion of external light incident from the observation side, so that the design displayed by the design layer can be viewed within a limited range on the observation side of the transmission screen. It becomes possible. The specific haze value can be the same as the haze value described in the above section “(a) First light diffusing portion”, and thus description thereof is omitted here. The adjustment of the haze value of the second light diffusing part can be appropriately adjusted according to, for example, the content or thickness of the light diffusing material contained in the first light diffusing part.

  The thickness of the second light diffusing part in this aspect depends on the average particle diameter and content of the particulate light diffusing material used in the second light diffusing part, the refractive index of the transparent resin, the refractive index of the light diffusing material, and the like. It can be adjusted appropriately. In this aspect, it is preferable that the second light diffusing portion has a thickness that can exhibit a desired light diffusing function. The specific thickness of the second light diffusion portion is preferably in the range of 0.05 mm to 0.5 mm, for example, and preferably in the range of 0.01 mm to 0.1 mm, in particular. It is preferably within a range of 0.02 mm or more and 0.05 mm or less.

3. Picture layer The picture layer in the present invention is a layer having a picture function. That is, as shown in FIG. 1 (b), picture layer 1 is disposed on the observation side of the metal thin film layer 3, when the image light L ₁₀ is not projected, it is possible to display the picture on the viewing side it can.

  The material of the picture layer is preferably a material that can draw a desired picture. In the present invention, a picture is usually drawn using a printing method. Therefore, it is preferable to select a material that can be used for the printing method as the material of the pattern layer. Examples of such materials include inorganic pigments and organic pigments. Examples of the inorganic pigment include ferrocyanide, iron oxide, cadmium pigment, titanium oxide, alumina, calcium carbonate, barium sulfate and the like. Examples of the organic pigment include insoluble azo dye pigments, azo lake pigments, stalocyanine pigments, chelate pigments, nitro pigments, geoindigo pigments, anthraquinone pigments, perylene pigments, quinacridone pigments, and selenium. Examples of the pigments and dioxazine pigments include condensed azo pigments. In addition, you may use these pigments in mixture of 2 or more types as needed.

  If necessary, additives such as a filler, a plasticizer, a dispersant, a lubricant, an antistatic agent, an antioxidant, and an antifungal agent can be appropriately used for the material of the pattern layer.

  The thickness of the picture layer can be appropriately adjusted according to the picture displayed by the picture layer, the use and size of the transmission screen, and the like. The specific thickness of the pattern layer is, for example, preferably in the range of 1 μm to 20 μm, and more preferably in the range of 1.5 μm to 10 μm.

4). Fresnel lens layer The Fresnel lens layer in this invention is a member arrange | positioned on the surface at the side of the light source of the laminated body which has a pattern layer, a metal thin film layer, and a light-diffusion layer. The Fresnel lens layer has a curved shape in which the observation side surface forms a three-dimensional curved surface. Therefore, when the Fresnel lens layer is provided, the laminated body usually has a curved shape in which the surface on the observation side forms a three-dimensional curved surface.

  As shown in FIG. 6, the Fresnel lens layer 30 according to the present invention is, for example, a Fresnel lens part 31 and a Fresnel lens formed integrally with the surface of the Fresnel base part 31 on the light source side, and a plurality of unit lenses are arranged. Part 32.

  Hereinafter, the Fresnel lens part and Fresnel base material part which comprise the Fresnel lens layer in this invention are demonstrated.

(1) Fresnel lens portion The Fresnel lens portion in the present invention can reduce variations in brightness of an image observed by an observer, particularly when observed by an observer from an oblique direction of a transmission screen. It is preferable to have a function that can be performed. Such a Fresnel lens portion may be a refractive type Fresnel lens or a total reflection type Fresnel lens. In the present invention, a total reflection type Fresnel lens is particularly preferable. Compared to a refractive type Fresnel lens, the distance between the transmissive screen and the light source in the depth direction of the rear projection display device can be shortened, and the rear projection display device can be designed to be thin.

  Examples of the material for the Fresnel lens portion include ultraviolet curable resins such as urethane acrylate and epoxy acrylate, and ionizing radiation curable resins such as electron beam curable resins.

  In addition, about the detailed description regarding this other Fresnel lens part, it can be made the same as that of a well-known Fresnel lens part, for example, patent 6010890, Unexamined-Japanese-Patent No. 2013-152370, patent 2812413, and patent No. Since the content can be the same as that disclosed in US Pat. No. 2,869,939, description thereof is omitted here.

(2) Fresnel base material part The Fresnel base material part in this invention is a member which supports the Fresnel lens part mentioned above, and is a sheet-like member normally.

  Examples of the material for the Fresnel base material include polycarbonate, polyethylene terephthalate, methyl methacrylate / butadiene / styrene, methyl methacrylate / styrene, acrylonitrile / butadiene / styrene, and the like.

  The thickness of the Fresnel base material portion can be appropriately adjusted according to the design of the Fresnel lens layer, and is not particularly limited, but can be, for example, in the range of 0.5 mm to 4 mm.

  The Fresnel base material in the present invention may have a light diffusion function. In this case, it is preferable that a Fresnel base material part contains a light-diffusion material. The light diffusing material can be the same as that described in the above section “2. Light diffusing layer”, and therefore the description thereof is omitted here.

5. Transparent Substrate The transmission screen of the present invention may have a transparent substrate for supporting the light diffusion layer and the optical functional layer described above. The transparent substrate may be disposed on the light source side of the transmission screen or may be disposed on the observation side. Usually, for example, as shown in FIG. It is arranged on the light source side of the screen 100.

  The transparent substrate in the present invention preferably has a transparency that does not hinder the transmission of image light when image light is projected onto a transmission screen. As specific transparency of the transparent substrate, for example, the visible light transmittance is preferably 80% or more, and more preferably 90% or more. In addition, about the visible light transmittance | permeability of a transparent base material, it can measure with the test method of the total light transmittance of the plastic transparent base material based on JISK7361-1.

  As a material for the transparent substrate in the present invention, it is preferable to select a material having a predetermined visible light transmittance as described above. Specific examples thereof include resin films such as polyethylene terephthalate, polycarbonate, acrylic resin, cycloolefin resin, polyester resin, polystyrene resin, and acrylic styrene resin, and glass such as quartz glass, Pyrex (registered trademark), and synthetic quartz plate. In addition, the transparent base material in this invention may contain the ultraviolet absorber, the heat ray absorber, etc. other than the material mentioned above as needed.

  The thickness of the transparent substrate in the present invention preferably has a thickness that can support the light diffusion layer and the optical function layer described above. For example, the thickness of the transparent substrate is preferably in the range of 0.1 mm to 4.0 mm, and more preferably in the range of 1.0 mm to 2.0 mm. If the thickness of the transparent substrate is in the above range, desired support can be obtained, and if the transparent substrate is too thick, the occurrence of stray light and double images is suppressed. can do.

  The transparent substrate in the present invention may be, for example, a transfer substrate for transferring a transmission screen. In this case, for example, like the transmissive screen 100 shown in FIG. 7A, the picture layer 1, the light diffusion layer 2, and the metal thin film layer 3 may be disposed on the transfer base 7 as the transparent base 4. it can. In addition, the transmission screen 100 shown in FIG. 7A is designed to use the side on which the transfer base material 7 is disposed as the observation side of the transmission base screen 7, so that the pattern layer 1 and the light diffusion from the transfer base material 7 side. Layer 2 and metal thin film layer 3 are laminated. Further, in the transmissive screen 100 shown in FIG. 7A, the light source side surface of the transmissive screen 100 is attached to the adherend 40 via the adhesive layer 9, as shown in FIG. 7B. Can be used. After the transmission screen 100 is attached to the adherend 40, the transfer substrate 7 is finally peeled off. 7A and 7B, when the transparent base material 4 is used as the transfer base material 7, a release layer 8 for easily peeling the transfer base material 7 is provided. Also good. Further, as shown in FIGS. 7A and 7B, the observation side of the transmission type screen 100 has a hard coat function as a surface functional layer 5 for protecting the observation side surface of the optical functional layer 1. The surface protective layer 5a may be disposed. Since the description of the surface functional layer will be described later, description thereof is omitted here.

  When the transparent substrate is a transfer substrate, the material of the transfer substrate can be the same as the material described as the material of the transparent substrate, but from the viewpoint of easily peeling the transfer substrate, the predetermined It is preferable to use a flexible resin material.

  Further, when the transparent substrate is a transfer substrate, a release layer for easily peeling the transfer substrate may be provided. In addition, about a peeling layer, since it can be set as the thing of generally well-known, description here is abbreviate | omitted.

  The transmission screen of the present invention may be formed to be curved so as to have a concave curved surface whose center is depressed when viewed from the viewer side, that is, a curved surface that is convex toward the light source side, as necessary. . When obtaining such a curved transmissive screen, a transparent substrate having a function as a support for the transmissive screen is usually formed into a curved shape so as to have a curved surface, and then the curved transparent substrate is formed. A method of laminating the pattern layer, the light diffusion layer, and the metal thin film layer on the top can be employed. Examples of the method for forming the transparent substrate into a curved shape so as to have a curved surface include an insert molding method and an injection molding method. Note that the insert molding method and the injection molding method can be the same as the contents disclosed in, for example, Japanese Patent Application Laid-Open No. 2012-032513, and thus the description thereof is omitted here.

6). Surface Functional Layer The transmission screen of the present invention may have a surface functional layer as necessary. In the present invention, for example, as shown in FIG. 7B, the surface functional layer 5 can be disposed in the outermost layer on the observation side of the transmission screen 100.

  Examples of the function of the surface functional layer in the present invention include at least one function such as a hard coat function, an antiglare function, an antireflection function, an antistatic function, an ultraviolet absorption function, and an antifouling function. In the present invention, the surface functional layer is preferably a surface protective layer having a hard coat function.

  The surface protective layer in the present invention preferably has a predetermined hardness. As specific hardness, it is preferable that it is the hardness more than "HB" in the pencil hardness test prescribed | regulated by JISK600-5-4 (1994), for example. This is because the surface protective layer can exhibit a desired hard coat function.

  As the material for the surface protective layer in the present invention, for example, a material that exhibits a desired hard coat function and can protect the transmission screen of the present invention is preferable. The specific material of the surface protective layer preferably includes, for example, an ionizing radiation curable resin or a thermosetting resin. Here, the ionizing radiation curable resin refers to a resin containing at least an ionizing radiation curable resin monomer, an ionizing radiation curable resin oligomer, or a mixture thereof. In addition, when providing another function to the surface protective layer in this invention, an additive etc. can be suitably contained in a surface protective layer other than the said material.

  The thickness of the surface protective layer in the present invention is preferably, for example, a thickness that can exhibit a desired hard coat function, and can be appropriately adjusted according to the use of the transmission screen of the present invention. As a specific thickness of the surface protective layer, for example, it can be in the range of 0.05 μm or more and 2 μm or less.

7). Others The physical properties and applications of the transmission screen will be described below.

(1) Physical properties of transmission screen The transmission screen of the present invention preferably has a predetermined haze value. The specific haze value of the transmission screen is, for example, preferably in the range of 20% to 95%, and more preferably in the range of 30% to 60%. When the haze value of the transmissive screen has the above lower limit, it is possible to display a clear image when projecting image light. In addition, when the haze value of the transmission screen has the above upper limit, the opposite side can be observed through the opening of the optical functional layer. The haze value of the transmission screen can be appropriately adjusted according to, for example, the thickness of the light diffusion layer, the content of the particulate light diffusion material contained in the light diffusion layer, and the like. The haze value of the transmissive screen can be measured according to, for example, JIS K7136: 2000.

  The transmission screen of the present invention preferably has a predetermined transparency. As the specific transparency of the transmission screen, for example, the total light transmittance is preferably 60% or more, more preferably 80% or more, and particularly preferably 90% or more. In addition, the total light transmittance of a transmission type screen can be measured based on JISK7361-1: 1997, for example.

(2) Applications Examples of the transmission screen of the present invention include the following applications. There is an application as an advertisement that is attached to the inside or outside of the glass surface of the show window through an adhesive layer.

(3) Manufacturing Method The method for manufacturing the transmission screen of the present invention may be any method that can obtain the transmission screen having the predetermined configuration as described above, and generally adopts a known method. The description here is omitted.

B. Rear Projection Display Device The rear projection display device of the present invention includes an image light source that emits image light, and the above-described transmission screen that transmits the image light from the image light source and emits the image light to the observation side. Device.

  The description of the drawing of the rear projection type display device of the present invention can be the same as that in FIGS. 1A and 1B described above, and therefore the description thereof is omitted here.

  The rear projection type display device of the present invention is a rear projection type display device capable of displaying a predetermined image when the image light is not projected by having the above-described transmission type screen, and a light diffusion layer As a result, it is possible to provide a rear projection display device that can suppress a decrease in visibility due to a viewing angle and can suppress a decrease in visibility due to the use of a light diffusion layer. The detailed description of the effects of the present invention can be the same as the contents described in the section “A. Transmission type screen”, and the description is omitted here.

  Hereinafter, the rear projection type display device of the present invention will be described in detail.

1. Transmission Screen The transmission screen of the present invention is the same as the member described in the section “A. Transmission Screen” above. That is, the transmissive screen in the present invention is a member that displays image by transmitting image light projected from the light source side to the observation side, and is disposed on the pattern layer and the light source side surface of the pattern layer. A metal thin film layer, and the pattern layer and the metal thin film layer have a pattern-like opening in a region overlapping in plan view, between the pattern layer and the metal thin film layer, and between the opening and the plane. It is a member having a light diffusion layer disposed in a region overlapping in view.

  About each member which comprises the transmission type screen in this invention, since it can be made to be the same as that of the content described in the term of the said "A. transmission type screen", description here is abbreviate | omitted.

2. Image Light Source The image light source in the present invention is a member that emits image light.

  In the present invention, the image light emitted from the image light source may be directly projected on the transmission screen, or may be reflected by a mirror or the like and then projected on the transmission screen.

  As the image light source in the present invention, a conventionally known light source, for example, a light emitting diode called LED, a small light source such as a pico projector using a laser, a single tube light source using a DMD, or the like is used. be able to. The image light source in the present invention may be a member having a lighting fixture and a lighting fixture cover that covers the lighting fixture, and a pattern on which a picture to be displayed as video light is drawn on the lighting fixture cover. Furthermore, the image light source according to the present invention may be a member including a fixed image obtained by performing highly transparent printing on a transparent film and a light shielding portion, such as an OHP sheet. In this case, for example, the light emitted from the white light source passes through the fixed image, so that the transmitted light becomes the color of the fixed image, while part of the light emitted from the white light source is blocked by the light shielding unit. . In this way, a member having a fixed image, a light-shielding portion, and a monochromatic light source, which displays light and dark by the fixed image and the light-shielding portion (masking), illuminates and transmits the monochromatic light source from the back side. A light source may be used and the transmitted light may be projected onto a transmissive screen.

3. Applications Applications of the rear projection display device of the present invention will be described.

  As an application of the rear projection type display device of the present invention, for example, an application of an interior or exterior of an automobile can be mentioned. Specifically, it can be used as a display indicator, warning lamp, room lamp, foot lamp, illumination lamp, vehicle width lamp, headlight, tail lamp, turn signal, and the like.

  Moreover, as a use of the rear projection type display apparatus of this invention, the use to a house and a commercial facility is mentioned, for example. Specifically, it can be used as a display for information boards, advertisements, billboards, etc., and it can be used for lighting or lighting for lighting fixtures, windows, show windows, etc. Further, it can be used for embedded displays such as walls, doors, partitions, etc. The use as is mentioned.

  Furthermore, as a use of the rear projection type display device of the present invention, for example, a use for furniture is mentioned. Specifically, TV decoration applications, kitchen, bathroom, bedroom, door phone, etc. displays, furniture with embedded display, home appliances, desks, chairs, shelves, partitions, chests, getter boxes, beds, etc. . Applications to vacuum cleaners, refrigerators, rice cookers, microwave washing machines and the like can be mentioned.

  Furthermore, as a use of the rear projection type display device of the present invention, for example, a use as a warning display such as an evacuation route, a fire alarm, a warning light and the like can be mentioned.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.

[Example]
A general-purpose acrylic film having a size of 200 mm × 300 mm was prepared as a transparent substrate. The thickness of the transparent substrate was 75 μm. Next, it printed on the one side of the transparent base material in order of the pattern layer, the pattern light shielding layer, and the light-diffusion layer using the flexographic printing method. At this time, in order to form a pattern-shaped opening in the pattern layer, the pattern light shielding layer, and the light diffusion layer, each of the pattern layer, the pattern light shielding layer, and the light diffusion layer was subjected to pattern printing. The openings were formed by arranging non-printed portions having a diameter of 50 μm in a lattice pattern at a pitch of 100 microns. The picture layer was composed of two general-purpose color ink layers, each having a thickness of 1 μm. Further, the light diffusion layer was made of a resin in which titanium oxide was dispersed in a binder. The thickness of the light diffusion layer was 5 μm.

  Next, an aluminum thin film having a thickness of 100 nm was formed by sputtering from the light diffusion layer side surface of the laminate composed of the pattern layer, the pattern light shielding layer, and the light diffusion layer. Thereafter, a dry film resist was patterned in a smaller area than the portion where the light diffusion layer was disposed. The dry film resist pattern was prepared by photolithography using a general-purpose dry film resist having a thickness of 20 μm. Specifically, a 30 μm diameter hole was formed with an alignment accuracy of 10 μm. Then, the aluminum thin film of the hole part of the dry film resist was melt | dissolved by the etching process, and the dry film resist was peeled after that, and the metal thin film layer in which the opening part was formed was obtained.

  Next, the light diffusion part was printed by flexographic printing in the opening formed as described above. A resin in which titanium oxide was dispersed in a binder was used for the light diffusion portion. The light diffusing portion was obtained by overlapping and printing so that the thickness was about 10 μm so that the opening was filled. As a result, a transmission screen with the transparent substrate side as the observation side was obtained.

  The projector and screen are arranged so that images can be projected by a general-purpose projector (2000 ANSI Lumen) from the surface opposite to the transparent base of the transmissive screen, and the bright room (700 lx brightness) from the surface opposite the projector Observed. As a result, when the projector was OFF, the pattern was not diffused excessively and a clear pattern was observed. On the other hand, when the projector was turned on and the image was projected, an image with a moderate scattering and a wide viewing angle could be observed.

1 ... pattern layer 2 ... light diffusion layer 3 ... metal thin film layer 4 ... transparent substrate 10 ... image light source 20 ... observer 100 ... transmission screen L ₁₀ ... video image light L ₂₀ ... external light R1 ... opening R2 ... blocking parts

Claims (6)

A transmissive screen that displays image by transmitting image light projected from the light source side to the observation side,
The pattern layer,
A metal thin film layer disposed on the light source side surface of the pattern layer,
The pattern layer and the metal thin film layer have a pattern-like opening in a region overlapping in plan view,
A transmissive screen having a light diffusion layer disposed between the pattern layer and the metal thin film layer and in a region overlapping the opening in plan view.   The light diffusion layer disposed in a region overlapping the opening in plan view is a first light diffusion portion, and the light diffusion layer disposed between the pattern layer and the metal thin film layer is a second light diffusion portion. The transmissive screen according to claim 1, wherein the first light diffusion portion and the second light diffusion portion are integrated.   The light diffusion layer disposed in a region overlapping the opening in plan view is a first light diffusion portion, and the light diffusion layer disposed between the pattern layer and the metal thin film layer is a second light diffusion portion. The transmissive screen according to claim 1, wherein the first light diffusing unit and the second light diffusing unit are separate bodies. A transmissive screen that displays image by transmitting image light projected from the light source side to the observation side,
A laminate comprising the pattern layer according to any one of claims 1 to 3, the metal thin film layer, and the light diffusion layer,
The laminated body is a transmissive screen having a curved shape in which the observation side surface forms a three-dimensional curved surface. A Fresnel lens layer disposed on the light source side surface of the laminate,
The transmissive screen according to claim 4, wherein the Fresnel lens layer has a curved shape in which an observation side surface forms a three-dimensional curved surface. An image light source that emits image light;
A rear projection display device comprising: the transmission screen according to any one of claims 1 to 5, wherein the image light from the image light source is transmitted and emitted to an observation side.