JP6922324B2 - Transmissive screen and rear projection display - Google Patents

Description

The present invention relates to a transmissive screen that transmits an image light projected from one surface side to the other surface side and displays an image, and a rear projection type display device provided with the transmissive screen.

As one of the display devices for displaying images and images, there is a rear projection display device. The rear projection display device includes a transmissive screen that transmits the image light projected from the back side, and is also called a rear projection display device. As disclosed in Patent Documents 1 to 3, this transmissive screen can be visually recognized by an observer by emitting the image light projected from the image light source to the side opposite to the side provided with the image light source. The image can be displayed.

In recent years, a technique has been proposed in which a predetermined pattern is displayed from the observing side even when the image light is not projected on the transmissive screen. With this technique, the design of the transmissive 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 an observation side surface of a transmissive screen. Further, it is disclosed that a large number of openings are formed in the pattern layer arranged on the observation side of the transmissive screen in a plan view. By forming a large number of openings in the pattern layer in a plan view, when the image light is projected, the image light can be transmitted through the openings and the image can be displayed on the observation side.

Japanese Unexamined Patent Publication No. 2005-37818 JP-A-2007-524115 Japanese Unexamined Patent Publication No. 2013-2183883

The transmissive screen as described above has a problem that when the image light is projected, the image light passes through the pattern layer, so that the visibility of the pattern layer is lowered. As a technique for suppressing such a decrease in visibility of the pattern layer, a technique of providing a light-shielding layer having a light-shielding property on the surface of the pattern layer on the light source side has been proposed. 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 surface of the pattern layer on the light source side, there is a problem that the color of the pattern displayed by the pattern layer becomes dark. Further, since the light-shielding layer having a white pigment has a relatively poor light-shielding property, it is necessary to increase the thickness of the light-shielding layer in order to exhibit a desired function, and there is a problem that the thickness of the transmissive screen itself increases. ..

The present inventors have repeatedly studied a light-shielding layer capable of suppressing a decrease in visibility such as darkening of the color tone of the pattern displayed on the pattern layer without increasing the thickness. As a result, it was found that by using the metal thin film layer as the light-shielding layer, it is possible to suppress a decrease in visibility such as darkening of the color of the pattern displayed by the pattern layer without increasing the thickness. Therefore, the present inventors have further studied a transmissive screen using a metal thin film layer as a light-shielding layer. As a result, when the metal thin film layer is arranged on the surface of the pattern layer on the light source side, the light reflectivity of the metal thin film layer reduces the visibility of the pattern displayed by the pattern layer, which is a new problem.

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. An object of the present invention is to provide a transmissive screen capable of suppressing a decrease in visibility of a pattern displayed by the screen.

The present invention is a transmissive screen that transmits an image light projected from the light source side to the observation side and displays an image, and includes a pattern layer and a metal thin film layer arranged on the surface of the pattern layer on the light source side. The pattern layer and the metal thin film layer have a patterned opening in a region where the pattern layer and the metal thin film layer overlap in a plan view, and a region between the pattern layer and the metal thin film layer and a region in which the opening and the metal thin film layer overlap in a plan view. Provided is a transmissive screen having a light diffusing layer arranged in.

According to the present invention, a transmissive screen capable of suppressing the transmission of image light to the pattern layer by providing a metal thin film layer at a predetermined position, while suppressing an increase in the thickness of the transmissive screen. , A transmissive screen capable of suppressing a decrease in visibility of the pattern displayed by the pattern layer can be obtained.

In the present invention, the light diffusing layer arranged in the region overlapping the opening in a plan view is used as the first light diffusing portion, and the light diffusing layer arranged between the pattern layer and the metal thin film layer is used as the first light diffusing layer. When the second light diffusing part is used, it is preferable that the first light diffusing part and the second light diffusing part are integrated. It is possible to suppress the misalignment of the metal thin film layer, the pattern layer, and the light diffusing layer arranged between them, and to obtain a high-quality transmissive screen.

In the present invention, the light diffusing layer arranged in a region overlapping the opening in a plan view is used as a first light diffusing portion, and the light diffusing layer arranged between the pattern layer and the metal thin film layer is used as the first light diffusing layer. When the second light diffusing part is used, it is preferable that the first light diffusing part and the second light diffusing part are separate bodies. The light diffusing performance of the first light diffusing portion and the second light diffusing portion can be appropriately adjusted according to the application of the transmissive screen.

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

In the present invention, it is preferable that the Fresnel lens layer is provided on the surface of the laminated body on the light source side, and the Fresnel lens layer has a curved shape in which the surface on the observation side forms a three-dimensional curved surface. By having the Fresnel lens layer, it is possible to reduce in-plane variation in brightness of an image observed by an observer, particularly an image observed by an observer from an oblique direction of a transmissive screen.

The present invention also provides a rear projection display device including a video light source that emits video light and the transmissive screen that transmits the video light from the video light source and emits it to the observation side.

According to the present invention, the rear projection type display device capable of suppressing the transmission of image light to the pattern layer by having the above-mentioned transmissive screen, while suppressing an increase in the thickness of the transmissive screen. , It is possible to provide a rear projection type display device capable of suppressing a decrease in visibility of a pattern displayed by the pattern layer.

The present invention is a transmissive screen capable of suppressing the transmission of image light to the pattern layer, and while suppressing an increase in the thickness of the transmissive screen, reducing the visibility of the pattern displayed by the pattern layer. It has the effect of being able to provide a transmissive screen that can be suppressed.

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

Hereinafter, the transmissive screen and the rear projection display device of the present invention will be described.

I. Transmissive screen The transmissive screen of the present invention is a member that transmits the image light projected from the light source side to the observation side and displays the image, and is arranged on the pattern layer and the surface of the pattern layer on the light source side. The pattern layer and the metal thin film layer have a patterned opening in a region where they overlap in a plan view, and are between the pattern layer and the metal thin film layer, and with the opening. It is a member having a light diffusion layer arranged in an overlapping region in a plan view.

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

Hereinafter, the transmissive screen of the present invention will be described with reference to drawings and the like. However, the present invention can be implemented in many different embodiments and is not construed as being limited to the description of the embodiments exemplified below. Further, in order to clarify the description, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the embodiment, but this is just an example, and the interpretation of the present invention is used. It is not limited. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate.

FIG. 1A is a schematic schematic view showing an example of a back projection type display device using the transmissive screen of the present invention. Further, FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A. _{As illustrated in FIG. 1A, the transmissive screen of the present invention transmits the image light L 10} projected from the image light source 10 from one surface side of the transmissive screen 100 to the other surface side. The image 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 transmissive screen 100 of the present invention can display a predetermined pattern from the observation side even when no image light is projected. Further, as shown in the enlarged view of FIG. 1A and FIG. 1B, the transmissive screen 100 has a large number of openings R1 in a plan view, so that when the image light L ₁₀ is projected, the transmissive screen 100 has a large number of openings R1. 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, in the transmissive screen 100 of the present invention shown in FIGS. 1A and 1B, the pattern layer 1, the metal thin film layer 3 arranged on the surface of the pattern layer 1 on the light source side, the pattern layer 1 and the metal It includes a light diffusing layer 2 arranged between the thin film layers 3. Further, the pattern layer 1 and the metal thin film layer 3 have a patterned opening R1 in a region where they overlap in a plan view. The transmissive screen 100 shown in FIGS. 1A and 1B is an example having a configuration in which each of the above members is supported by the transparent base material 4.

According to the present invention, the transmissive screen having the above-described configuration has the following effects. First, the conventional transmissive screen has a problem that when the image light is projected, the image light passes through the pattern layer, so that the visibility is lowered. As a technique for suppressing such a decrease in visibility, for example, as shown in FIG. 8B, a light-shielding layer 5B having a black pigment is provided on the surface of the pattern layer 1 on the light source side, and the image light L ₁₀ is provided. A technique for suppressing the transmission of the pattern layer 1 has been proposed. When a light-shielding layer 5B containing a black pigment is provided on the light source side of the _{picture layer 1, it is possible to sufficiently suppress the image light L 10} from passing through the picture layer 1, while the picture displayed by the picture layer 1 can be sufficiently suppressed. There arises a problem that the hue is displayed dark due to the influence of the light-shielding layer 5B which exhibits black color. As another technique, for example, as shown in FIG. 8C, a light-shielding layer 5W having a white pigment is provided on the surface of the pattern layer 1 on the light source side to affect the pattern displayed by the pattern layer 1. A technique has been proposed in which the image light L ₁₀ is suppressed from passing through the pattern layer 1 without being provided. However, the light-shielding layer 5W that exhibits white color due to the white pigment tends to have a lower light-shielding property than the light-shielding layer 5B that exhibits black color. Therefore, in order _{to suppress the transmission of the image light L 10} , it is necessary to design the light-shielding layer 5W to be relatively thick, which causes a problem that the thickness of the transmissive screen 100'itself becomes thick. Note that FIG. 8A is a schematic view showing an example of a rear projection type display device using a conventional transmissive screen. Further, FIGS. 8 (b) and 8 (c) correspond to the cross-sectional views taken along the line A'-A'of FIG. 8 (a), and each shows the configuration of a conventional transmissive screen. The members indicated by reference numerals 6 in FIGS. 8 (b) and 8 (c) refer to the light transmitting members arranged in the opening R1, and the other unexplained reference numerals are referred to in FIGS. 1 (a) to 1 (c). Since the same can be applied, the description here is omitted.

By the way, Patent Document 1 discloses that a metal thin film is used as a 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 conducted repeated studies based on the above findings. As a result, we discovered the following new issues. That is, first, as shown in FIG. 9, in the case of the 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 emitted 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. _{At this time, there arises 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 the light source that irradiates the external light L 20} is reflected on the metal thin film layer 3, the area on the surface of the metal thin film layer 3 on which the light source is reflected becomes very bright. Then, the visibility of the pattern to be displayed by the pattern layer 1 is lowered by the _{external light L 20 reflected on the metal thin film layer 3.}

According to the present invention, as shown in FIG. 1 (b), by providing the light diffusion layer 2 between the pattern layer 1 and the metal thin film layer 3, the metal of _{the light L 20 incident from the observation side is provided. The light L 23} incident on the thin film layer 3 can be diffused. Therefore, for example, as shown in FIG. 9, it is possible to suppress the reflection _{of the external light L 20 on the metal thin film layer 3 as it is.} Therefore, as shown in FIG. 1B, it is possible to suppress a decrease in visibility of the pattern displayed by the pattern layer 1 due _{to the external light L 20 reflected in the metal thin film layer 3.}

As shown in FIG. 10A, the conventional transmissive screen has a configuration in which the light diffusion layer 2 is arranged on the observation side surface of the transmissive screen 100'. As shown in FIG. 10A, when the light diffusing layer 2 is arranged on the observation side surface of the transmissive screen 100', the image light L ₁₀ passes through the opening R1 and is diffused by the light diffusing layer 2. Will be done. Thereby, when projected on the transmissive screen 100 'the image light L ₁₀ as shown in FIG. 10 (a) 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 arranged on the observation side surface of the transmissive screen 100', the external light L _{20 incident on the transmissive screen 100'from the observation side} Is reflected by the metal thin film layer 3 having a light-shielding function, and is _{diffused by the light diffusing layer 2 when the external light L 20} is emitted from the surface on the incident side. Then, when the image light L ₁₀ is not projected on the transmissive screen 100', the pattern displayed by the optical functional layer 1 having the pattern function becomes white due _{to the external light L 20 diffused by the light diffusing layer 2.} It may look blurry.

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

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

1. 1. Metal Thin Film Layer The metal thin film layer in the present invention is a member arranged on the surface of the pattern layer on the light source side, which will be described later. Further, the metal thin film layer has openings in a pattern, and the openings are arranged in a region that overlaps with the openings of the pattern layer described later in a plan view.

In the present invention, the pattern layer and the metal thin film layer have a patterned opening in a region where they overlap in a plan view. Here, "the pattern layer and the metal thin film layer have a pattern-like opening in a region where they overlap in a plan view" means, for example, as shown in FIG. 2A, an opening formed in the pattern layer 1. It means that R1 and the opening R1 formed in the metal thin film layer 3 overlap each other in a plan view. Further, in the present invention, as shown by the arrow in FIG. 2B, the end portion of the pattern layer 1 on the opening R1 side and the end portion of the metal thin film layer 3 on the opening R1 side are in a plan view. It may overlap, and as shown by the arrow in FIG. 2C, the end of the adjacent pattern layer 1 on the opening R1 side and the end of the metal thin film layer 3 on the opening R1 side are It does not have to overlap in plan view.

In the present invention, it is preferable that the end portion of the adjacent metal thin film layer on the opening side overlaps the end portion of the adjacent pattern layer on the opening side in a plan view. When the image light is projected onto the transmissive screen of the present invention, the image light is transmitted through the pattern layer and emitted, and it is possible to suppress the occurrence of problems such as deterioration of visibility. Further, when the image light is not projected on 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 the visibility is lowered. As shown in FIG. 3, in the metal thin film layer 3, when the region that overlaps with the pattern layer 1 in a plan view is indicated by reference numeral R2a and the region that does not overlap with the pattern layer 1 in a plan view is indicated by reference numeral R2b, for example, the metal thin film layer. The length of the region R2b in which 3 does not overlap with the pattern layer 1 in a plan view is preferably within a range of 20 μm or less, particularly preferably within a range of 10 μm or less, and particularly preferably within a range of 5 μm or less. Is preferable. The reference numerals not described in FIG. 3 can be the same as those in FIG. 1 (b) described above, and thus the description thereof will be omitted here.

As shown in FIGS. 1A and 1B, a large number of patterned openings of the metal thin film layer in the present invention are usually formed in a plan view of the metal thin film layer 3. In the present invention, the formation of a large number of patterned openings makes it possible to transmit the image light from the openings to the observation side when the image light is projected onto the transmissive screen. As a result, the observer can visually recognize a predetermined image by the image light transmitted to the observing side.

In the plan view of the metal thin film layer, the area ratio of the opening region to the other region is such that when the image light is projected on the transmissive 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 on the transmissive screen, the visibility of the pattern displayed by the pattern layer can be sufficiently ensured. It is preferably an area ratio. Therefore, in the plan view of the metal thin film layer, the area ratio of the opening region to the other region can be appropriately adjusted according to the application of the transmissive screen and the like. As a specific area ratio, for example, the area of the opening and the other area are preferably in the range of 1: 6 or more and 6: 1 or less, and in particular, 1: 4 or more and 4: 1 or less. 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 patterned opening in the metal thin film layer should be such that when the image light is projected onto the transmissive screen, the image light can be sufficiently transmitted to the observation side. preferable. Specific examples of the plan view shape of the opening include a circular shape, a rectangular shape, a grid shape, and the like. It is usually circular. Further, the circular shape here also includes an elliptical shape and the like. Further, a large number of openings in the metal thin film layer are usually formed. Therefore, the plan-view shapes of many openings may be the same or different.

The size of the plan view shape of the patterned opening in the metal thin film layer is preferably a size that satisfies the above-mentioned area ratio. When the plan view shape of the opening is circular, for example, the diameter can be 5 mm or less, particularly 0.2 mm or less, particularly 0.05 mm or less. The size of the opening 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 pattern displayed by the pattern layer from being lowered. Further, the spacing between adjacent openings can be appropriately adjusted according to the size of the openings and the like, but for example, it is preferable to set the spacing between adjacent openings so as to satisfy a predetermined aperture ratio. .. Specifically, the aperture ratio can be 50% or less, particularly 25% or less. The aperture ratio can be 5% or more. Here, the distance between the adjacent openings refers to, for example, the distance indicated by the reference numeral W in FIG. 1 (a). On the other hand, when the plan view shape of the patterned openings in the metal thin film layer is a grid pattern, the specific size of the openings can be, for example, the length of one side of the grid to be 4 mm or less. .. When the plan view shape of the patterned opening in the metal thin film layer is a strip shape, the specific size of the opening is, for example, a strip width of 4 mm or less and an adjacent strip-shaped opening. The interval between the two can be 4 mm or less.

The metal thin film layer in the present invention is a member having a light-shielding function of blocking image light projected from a light source. Here, the "shading function that blocks the image light projected from the light source" means, for example, that 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 that the light-shielding function does not reduce the visibility of the image displayed by the image light. Therefore, the specific light-shielding function differs depending on the application of the transmissive screen, but for example, the total light transmittance is preferably in the range of 10% or less, and in particular, in the range of 3% or less. It is preferably in the range of 1% or less. Further, the shading function referred to here is preferably a function capable of blocking the image light projected on the transmissive screen. Therefore, the above-mentioned total light transmittance is determined according to the wavelength of the image light. Therefore, the light-shielding function can be defined by, for example, the 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 ultraviolet-visible spectrophotometer manufactured by JASCO Corporation. In addition to the spectral transmittance, the shading function can be defined by the ^{Y value and the 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. The method of calculating the Y value and the L ^* value from the spectral transmittance can be the same as the method of calculating from a known formula, 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 the light incident from the observation side when the image light is not projected from the light source. Here, the "reflection function capable of reflecting light incident from the observation side" of the metal thin film layer is preferably, for example, in ^{the range of the reflection intensity L *} value of 50 or more, particularly 70 or more. It is preferably 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 capable of forming a predetermined opening and having a desired thickness described later. In the present invention, a material capable of forming a metal thin film layer having a reflective hue can be selected, and among them, a material capable of forming a white metal thin film layer can be selected. Is preferable. This is because it is possible to suppress the deterioration of visibility due to the influence of the color tone of the metal thin film layer on the pattern of the pattern layer described later. Examples of the material of such a metal thin film layer include tin, indium, chromium, aluminum, nickel, silver, platinum, iron and the like. Further, as the metal thin film layer, an alloy containing at least one of the above-mentioned metal materials can be used. 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 be made to follow the curved surface.

The thickness of the metal thin film layer is preferably such that the desired light-shielding function can be exhibited. Further, from the viewpoint that the reflection function capable of reflecting the light incident from the observation side can be exhibited, for example, the thickness of the metal thin film layer is preferably in the range of 10 nm or more. Further, in the present invention, it is preferable that the thickness is such that a patterned opening can be formed, that is, the thickness is such that drilling can be performed. From this viewpoint, for example, a 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, the metal thin film layer in the present invention preferably has flexibility to the extent that it can follow the curved surface when the transmissive screen is curved so as to have a curved surface, and from such a viewpoint, it is preferable. For example, the thickness of the metal thin film layer is preferably in the range of 10 nm or more and 500 nm or less, and more preferably in the range of 10 nm or more and 100 nm or less.

In the present invention, the surface of the metal thin film layer on the observation side may have an uneven shape. This is because the light incident from the observation side can be diffused when the image light is not projected on the transmissive screen of the present invention. The size and depth of the uneven shape formed on the surface of the metal thin film layer can be appropriately adjusted according to the application of the transmissive screen of the present invention. As a method for forming an uneven shape on the surface of the metal thin film layer, a generally known method can be adopted, and thus the description thereof is omitted here.

The method for forming the metal thin film layer in the present invention may be any method as long as it can form a patterned opening, and a general method can be adopted. For example, a vapor deposition method such as a vacuum vapor deposition method, a sputtering method, an ion plating method and the like can be mentioned. Above all, 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 vaporization conditions can be appropriately set according to the melting temperature and the evaporation temperature of the metal used for the metal thin film layer. Further, in the present invention, in addition to the above-mentioned 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, and a transparent base material. Examples thereof include a method of arranging a metal foil on the surface and patterning by etching, a method of adhering a patterned metal foil on a transparent base material, and the like.

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

In the light diffusing layer in the present invention, for example, the light diffusing layer in the region that overlaps the opening in the plan view is the first light diffusing portion, and the light diffusing layer in the region that overlaps the closed portion other than the opening in the plan view is the second light. When the diffusing portion is used, the first aspect in which the first light diffusing portion and the second light diffusing portion are integrally formed, and as shown in FIG. 4, the light diffusing layer in the region overlapping the opening R1 in a plan view. When 2 is the first light diffusing portion 2a and the light diffusing layer 2 in the region that overlaps the closed portion R2 other than the opening R1 in a plan view is the second light diffusing portion 2b, the first light diffusing portion 2a and the second light It can be divided into the second aspect in which the diffusion portion 2b is a separate body.

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

(1) First Aspect The light diffusing layer of the present aspect has a light diffusing layer arranged in a region overlapping the opening in a plan view as a first light diffusing portion, and is arranged between a pattern layer and a metal thin film layer. When the light diffusing layer is the second light diffusing portion, the first light diffusing portion and the second light diffusing portion are integrally formed. Specifically, as shown in FIG. 1B, between the pattern layer 1 and the metal thin film layer 3, the opening R1 of the pattern layer 1 and the metal thin film layer 3 and the above-mentioned opening in a plan view. This is an embodiment formed integrally with the closed portion R2 other than the portion R1. Here, "integral" means that the first light diffusing portion and the second diffusing portion are continuously formed as one member. In this embodiment, since the first light diffusing portion and the second light diffusing portion are integrated, it is possible to suppress the occurrence of misalignment when the light diffusing layer is provided in a pattern on the metal thin film layer. Therefore, when the pattern layer is provided on the light diffusion layer, it is possible to suppress the occurrence of a positional shift between the pattern layer and the metal thin film layer in a plan view. Therefore, the configuration of this embodiment is preferable from the viewpoint of manufacturing a transmissive screen.

The light diffusing layer in this embodiment is a member in which the first light diffusing portion and the second light diffusing portion are integrally formed. Therefore, hereinafter, the first light diffusing portion and the second light diffusing portion will be collectively described as a light diffusing layer.

The light diffusion layer in this embodiment is usually a member having light transmission. The light transmission of the light diffusing layer is preferably such that the video light can pass through the light diffusing layer when the image light is projected onto the transmissive screen of this embodiment. Here, as the specific light transmittance of the light diffusion layer, for example, the total light transmittance is preferably in the range of 60% or more, particularly preferably in the range of 80% or more, and particularly 90. It is preferably in the range of% or more. When the image light is projected on 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. The total light transmittance of the light diffusion layer can be measured by, for example, a method based on JIS K7361-1: 1997.

The light diffusing layer in this embodiment can be obtained, for example, by dispersing a particulate light diffusing material in a transparent resin. In this embodiment, the case where a transparent resin is used will be described, but glass may be used instead of the transparent resin, and further, not only a solid but also a fluid such as a liquid or a liquid crystal can be used. be.

The particulate light diffusing material and the transparent resin have different refractive indexes from each other. The refractive index of the transparent resin can be, for example, in the range of 1.45 or more and 1.60 or less. On the other hand, the refractive index of the light diffusing material may have a predetermined difference from the refractive index of the transparent resin described above, and can be appropriately selected depending on the refractive index of the transparent resin. The refractive index of the light diffusing material is preferably selected in the range of 1.30 or more and 2.40 or less, and more preferably 1.40 or more and 1.60 or less. 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 transmissive 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, specifically, a polyethylene terephthalate resin, a polycarbonate resin, a methyl methacrylate / styrene resin, or a methyl methacrylate / butadiene / styrene. Examples thereof include resins, acrylic resins, triacetyl cellulose resins, and polyethylene naphthalate resins. Further, various additives such as a cross-linking 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. You may be.

Examples of the light diffusing material used for the light diffusing layer include organic fillers such as plastic beads, and a material having high transparency is particularly preferable. As the plastic beads, for example, those made of melamine resin, acrylic resin, acrylonitrile styrene resin, polycarbonate resin and the like can be applied. Silicon-based beads can also be used as a light diffusing material. Further, these light diffusing materials can be appropriately selected according to the desired diffusing 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 indefinite shape, a star shape, and a konpeito shape. Further, the particulate light diffusing material may be, for example, hollow particles or core-shell particles.

The average particle size of the particulate light diffusing material is, for example, preferably in the range of 1 μm or more and 50 μm or less, and more preferably in the range of 5 μm or more and 30 μm or less. When the average particle size 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 seen through the light diffusing layer is reduced. It can be suppressed. Further, when the average particle size of the particulate light diffusing material has the above upper limit, it is possible to suppress a decrease in the light transmittance of the light diffusing layer and suppress a decrease in contrast due to glare. Since the average particle size of the light diffusing material can be measured by a general method, the description here is omitted.

The content of the particulate light diffusing material in the light diffusing layer is the refractive index of the transparent resin used for 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. , It can be appropriately adjusted according to the state of dispersion of the particulate light diffusing material in the transparent resin. For example, the particulate light diffusing material can be in the range of 0.3 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the transparent resin, and in particular, within the range of 1 part by mass or more and 10 parts by mass or less. Is preferable. 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. Further, when the content of the particulate light diffusing material in the light diffusing layer has the above upper limit, it is possible to suppress a decrease in the light transmittance of the light diffusing layer.

The thickness of the light diffusing layer can be appropriately adjusted according to the average particle size and content of the particulate light diffusing material used for the light diffusing layer, the refractive index of the transparent resin, the refractive index of the light diffusing material, and the like. In this aspect, it is preferable that the light diffusing layer has a thickness sufficient to exhibit a desired light diffusing function. The specific thickness of the light diffusion layer is, for example, preferably in the range of 0.05 mm or more and 1.5 mm or less, and particularly preferably in the range of 0.1 mm or more and 1.0 mm or less. When the thickness of the light diffusing layer has the above lower limit, the light diffusing layer can exhibit a desired light diffusing function. Further, by having the thickness of the light diffusion layer having the above upper limit, it is possible to suppress deterioration of visibility such as blurring of the image displayed when the image light is projected on the transmissive screen and reduction of the resolution. Can be done. The thickness of the light diffusing layer here refers to the distance at which the length of the light diffusing layer in the thickness direction is maximized.

The light diffusion layer preferably has a predetermined haze value. The specific haze value of the light diffusion layer is, for example, preferably in the range of 1% or more and 60% or less. 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 blurring of the image displayed when the image light is projected on the transmissive screen. The haze value of the light diffusion layer can be measured according to, for example, JIS K7105: 1981.

The method for forming the light diffusing layer in this embodiment is not particularly limited as long as it can form a light diffusing layer having a desired light diffusing performance, and a generally known method can be adopted. For example, after forming a metal thin film layer having patterned openings on a transparent base material, a paint in which a particulate light diffusing material is dispersed in a transparent resin so as to cover the metal thin film layer is applied with a gravure coat. Examples thereof include a method of applying and drying by using a known method such as roll coating, bead coating, spray coating and inkjet.

(2) Second Aspect As shown in FIG. 4, in the light diffusing layer in this aspect, the light diffusing layer 2 in the region overlapping the opening R1 in a plan view is set as the first light diffusing portion 2a, and the openings other than the opening R1 are closed. When the light diffusing layer 2 in the region overlapping with the part R2 in a plan view is the second light diffusing part 2b, the first light diffusing part 2a and the second light diffusing part 2b are separate bodies.

In the transmissive screen of this embodiment, as shown in FIG. 4, the light diffusing layer 2 arranged in the region that overlaps the opening R1 of the pattern layer 1 and the metal thin film layer 3 in a plan view is designated as the first light diffusing portion 2a. When the light diffusing layer 2 arranged between the pattern layer 1 and the metal thin film layer 3, that is, the region R2 where the pattern layer 1 and the metal thin film layer 3 overlap in a plan view is used as the second light diffusing portion 2b, the first The light diffusing portion 2a and the second light diffusing portion 2b can be formed as separate bodies. By providing the first light diffusing unit 2a and the second light diffusing unit 2b as separate bodies in this way, the light diffusing performance of the first light diffusing unit 2a and the light diffusing performance of the second light diffusing unit 2b can be obtained. Can be appropriately adjusted according to the application of the transmissive 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 L ₁₀ 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 transmissive screen. On the other hand, when the light diffusing performance of the second light diffusing unit 2b is enhanced, the second light diffusing unit 2b observes when _{the image light L 10 from the image light source 10 is not projected on the transmissive screen 100.} The 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 transmissive screen.

Further, for example, when the light diffusion performance of the first light diffusion unit 2a shown in FIG. 4 is suppressed, the first light diffusion occurs when _{the image light L 10 from the image light source 10 is projected onto the transmissive 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 transmissive screen. On the other hand, when the light diffusing performance of the second light diffusing unit 2b is suppressed, the second light diffusing unit 2b may display the image light L ₁₀ from the image light source 10 on the transmissive screen 100. It is possible to suppress the diffusion of external light incident from the observation side. Therefore, it is possible to visually recognize the pattern displayed by the pattern layer in a limited range on the observation side of the transmissive screen.

Further, in the transmissive screen of this embodiment, as shown in FIG. 4, the light diffusing layer is composed of a first light diffusing portion and a second light diffusing portion, and the first light diffusing portion and the second light diffusing portion are separate bodies. By being formed as, it has the following effects. That is, the light diffusing layer is less susceptible to the difference in moldability of each member constituting the transmissive screen. Specifically, the light diffusing layer is less likely to be damaged during three-dimensional molding of the transmissive screen, and when the light diffusing layer is integrated, the shape of each member is distorted. Can be suppressed.

Hereinafter, the first light diffusing section and the second light diffusing section in this embodiment will be described separately.

(A) First light diffusing part The first light diffusing part in this embodiment refers to a light diffusing layer in a region that overlaps the opening in a plan view. Here, the "region that overlaps the opening in the plan view" refers to a region that overlaps the opening of the pattern layer and the opening of the metal thin film layer in the plan view. Specifically, it refers to the region indicated by reference numeral R1 in FIG.

The light transmittance, material, etc. of the first light diffusing portion in this embodiment can be the same as the contents of the light diffusing layer described in the above "(1) First aspect", and thus the description here. Is omitted.

The haze value of the first light diffusing portion in this embodiment can be appropriately adjusted according to the use of the transmissive screen and the like. Specifically, when the video light is projected from the video light source and transmitted to the observation side, the transmissive screen can be used properly depending on how much the video 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 visually recognized in a wide range on the observation side of the transmissive 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 visually recognized within a limited range on the observation side of the transmissive screen. It will be possible. The specific haze value when it is desired to increase the haze value can be, for example, within the range of 30% or more and 99% or less, while the specific haze value when it is desired to decrease the haze value can be set. Can be, for example, in the range of 1% or more and 29% or less. The haze value of the first light diffusing part can be measured according to, for example, JIS K7105: 1981. Further, the haze value of the first light diffusing portion can be appropriately adjusted according to, for example, the content and thickness of the light diffusing material contained in the first light diffusing portion.

The thickness of the first light diffusing portion in this embodiment depends on the average particle diameter and content of the particulate light diffusing material used in the first 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 as appropriate. In this embodiment, it is preferable that the first light diffusing portion has a thickness sufficient to exhibit a desired light diffusing function. Since the specific thickness of the first light diffusing portion can be the same as the thickness of the light diffusing layer described in the above-mentioned "(1) First aspect", the description here is omitted.

The first light diffusing portion in this embodiment is preferably thick enough to exhibit a desired light diffusing function as described above, but at that time, for example, as shown in FIG. 5, the first light diffusing portion is used. The thickness of the portion 2a may be so thick that it protrudes from the surface of the adjacent pattern layer 1 on the observation side. Although FIG. 5 shows an example in which the first light diffusing portion 2a protrudes from the surface of the adjacent pattern layer 1 on the observation side, for example, even if the first light diffusing portion 2a protrudes from the surface of the adjacent metal thin film layer 3 on the light source side. good.

In this embodiment, the members are laminated in order from the light source side of the transmissive screen, and as shown in FIG. 4, the first light diffusing portion 2a is formed on the same plane as the metal thin film layer 3. In this case, the thickness of the first light diffusing portion 2a is preferably at least thicker than 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 transmissive screen and the first light diffusing portion is formed on the same plane as the pattern layer, the thickness of the first light diffusing portion is formed. 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 where it overlaps with the metal thin film layer 3 or the pattern layer 1 in a plan view. By suppressing the misalignment of the second light diffusing portion 2b, the pattern layer or the metal thin film layer formed on the second light diffusing portion can be formed with high positional accuracy. Therefore, when the image light is projected on the transmissive screen of this embodiment, the occurrence of light leakage of the image light can be suppressed.

The method for forming the first light diffusing portion in this aspect can be the same as the method for forming the light diffusing layer described in the section of "(1) First aspect" above, but in the case of this aspect, the transparent base material. It is possible to form a first light diffusing portion in advance, and then to form a metal thin film layer, a second light diffusing portion, and a pattern layer. Further, a metal thin film layer, a second light diffusing portion and a pattern layer may be formed on the transparent base material, and then a first light diffusing portion may be formed.

(B) Second light diffusing portion The second light diffusing portion in this embodiment refers to a light diffusing layer in a region that overlaps with a closed portion other than the opening in a plan view. Here, the "region that overlaps the closed portion other than the opening in the plan view" is a region that overlaps the closed portion other than the opening of the pattern layer and the opening of the metal thin film layer in the plan view, in other words, at least the pattern layer. And, it refers to a closed portion that overlaps with either one of the metal thin film layers in a plan view and a region that overlaps in a plan view. Specifically, it refers to a region other than the region indicated by reference numeral R1 in FIG. 3, that is, a region indicated by reference numeral R2.

The light transmittance, material, forming method, etc. of the second light diffusing portion in this embodiment can be the same as the contents of the light diffusing layer described in the above "(1) First aspect". The description here is omitted.

The haze value of the second light diffusing portion in this embodiment can be appropriately adjusted according to the use of the transmissive screen and the like. Specifically, when the video light is not projected from the video light source, the transmissive screen can be used properly depending on how much the 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 visually recognized in a wide range on the observation side of the transmissive screen. Become. On the other hand, if the haze value is lowered, the diffusion of external light incident from the observation side can be suppressed, so that the pattern displayed by the pattern layer can be visually recognized within a limited range on the observation side of the transmissive screen. It will be possible. Since the specific haze value can be the same as the haze value described in the above section "(a) First light diffusing part", the description here is omitted. Further, the haze value of the second light diffusing portion can be appropriately adjusted according to, for example, the content and thickness of the light diffusing material contained in the first light diffusing portion.

The thickness of the second light diffusing portion in this embodiment 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 as appropriate. In this embodiment, it is preferable that the second light diffusing portion has a thickness sufficient to exhibit a desired light diffusing function. The specific thickness of the second light diffusing portion is, for example, preferably in the range of 0.05 mm or more and 0.5 mm or less, and particularly preferably in the range of 0.01 mm or more and 0.1 mm or less. It is preferably in the range of 0.02 mm or more and 0.05 mm or less.

3. 3. Picture layer The picture layer in the present invention is a layer having a picture function. That is, as shown in FIG. 1B, the pattern layer 1 is arranged on the observation side of the metal thin film layer 3, and the pattern can be displayed on the observation side when _{the image light L 10 is not projected.} can.

The material of the pattern layer is preferably a material capable of drawing a desired pattern. In the present invention, a pattern is usually drawn by using a printing method. Therefore, it is preferable to select a material that can be used in the printing method as the material of the pattern layer. Examples of such a material include inorganic pigments and organic pigments. Examples of the inorganic pigment include iron ferrocyanide, iron oxide, cadmium pigment, titanium oxide, alumina, calcium carbonate, barium sulfate and the like. Examples of organic pigments include insoluble azo pigments, azolake pigments, stallianin pigments, kelate pigments, nitro pigments, geoingigo pigments, anthracinone pigments, perylene pigments, quinacridone pigments, and slene. Examples of the system pigment and the dioxazine system pigment include a condensation type azo pigment. If necessary, two or more of these pigments may be mixed and used.

Additives such as fillers, plasticizers, dispersants, lubricants, antistatic agents, antioxidants, and fungicides can be appropriately used as the above-mentioned materials for the pattern layer, if necessary.

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

4. Fresnel lens layer The Fresnel lens layer in the present invention is a member arranged on the surface of a laminate having a pattern layer, a metal thin film layer, and a light diffusion layer on the light source side. Further, the Fresnel lens layer has a curved shape in which the surface on the observation side forms a three-dimensional curved surface. Therefore, when the Fresnel lens layer is provided, the laminated body usually also 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 in the present invention is formed integrally with, for example, the Fresnel base material portion 31 and the surface of the Fresnel base material portion 31 on the light source side, and a plurality of unit lenses are arranged in the Fresnel lens. It has a part 32 and.

Hereinafter, the Fresnel lens portion and the Fresnel base material portion constituting the Fresnel lens layer in the present invention will be described.

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

Examples of the material of the Frenel lens portion include an ultraviolet curable resin such as urethane acrylate and epoxy acrylate, and an ionizing radiation curable resin such as an electron beam curable resin.

The detailed description of the other Fresnel lens unit can be the same as that of the known Fresnel lens unit. For example, Japanese Patent No. 6010890, Japanese Patent Application Laid-Open No. 2013-152370, Japanese Patent No. 2812413 and Japanese Patent No. 2812413. Since the contents can be the same as those disclosed in No. 2869939, the description here is omitted.

(2) Fresnel base material portion The Fresnel base material portion in the present invention is a member that supports the above-mentioned Fresnel lens portion, and is usually a sheet-shaped member.

Examples of the material of the Frenel base material include polycarbonate, polyethylene terephthalate, methyl methacrylate, butadiene, styrene, methyl methacrylate, styrene, acrylonitrile, butadiene, and styrene.

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 or more and 4 mm or less.

The Fresnel base material portion in the present invention may have a light diffusing function. In this case, the Fresnel base material preferably contains a light diffusing material. Since the light diffusing material can be the same as the content described in the above section "2. Light diffusing layer", the description here is omitted.

5. Transparent Base Material The transmissive screen of the present invention may have a transparent base material for supporting the above-mentioned light diffusion layer and optical functional layer. The transparent base material may be arranged on the light source side of the transmissive screen or on the observation side, but usually, as shown in FIG. 1B, for example, the transparent base material 4 is a transmissive type. It is arranged on the light source side of the screen 100.

The transparent substrate in the present invention preferably has transparency to the extent that it does not interfere with the transmission of the image light when the image light is projected onto the transmissive screen. As the specific transparency of the transparent base material, for example, the visible light transmittance is preferably 80% or more, and more preferably 90% or more. The visible light transmittance of the transparent substrate can be measured by, for example, a test method for the total light transmittance of a plastic-transparent substrate according to JIS K7361-1.

As the material of the transparent base material 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. The transparent substrate in the present invention may contain an ultraviolet absorber, a heat ray absorber, and the like, if necessary, in addition to the above-mentioned materials.

The thickness of the transparent base material in the present invention is preferably such that it can support the above-mentioned light diffusion layer and optical functional layer. The specific thickness of the transparent substrate is, for example, preferably in the range of 0.1 mm or more and 4.0 mm or less, and particularly preferably in the range of 1.0 mm or more and 2.0 mm or less. When the thickness of the transparent base material is within the above range, desired supportability can be obtained, and when the thickness of the transparent base material is too thick, stray light is generated and a double image is suppressed. can do.

The transparent substrate in the present invention may be, for example, a transfer substrate for transferring a transmissive screen. In this case, for example, as in the transmissive screen 100 shown in FIG. 7A, the pattern layer 1, the light diffusion layer 2, and the metal thin film layer 3 can be arranged on the transfer base material 7 as the transparent base material 4. can. Further, since the transmissive screen 100 shown in FIG. 7A is designed to use the side on which the transfer base material 7 is arranged as the observation side of the transmissive base material 7, the pattern layer 1 and the light diffusion from the transfer base material 7 side. The layer 2 and the metal thin film layer 3 are laminated. Further, in the transmissive screen 100 shown in FIG. 7 (a), as shown in FIG. 7 (b), the surface of the transmissive screen 100 on the light source side is attached to the adherend 40 via the adhesive layer 9. Can be used. After the transmissive screen 100 is attached to the adherend 40, the transfer base material 7 is finally peeled off. As shown in FIGS. 7A and 7B, when the transparent base material 4 is used as the transfer base material 7, a release layer 8 is provided to easily peel off the transfer base material 7. Is also good. Further, as shown in FIGS. 7A and 7B, the observation side of the transmissive screen 100 is provided with 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 to have may be arranged. Since the description of the surface functional layer will be described later, the description here will be omitted.

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

Further, when the transparent base material is a transfer base material, a release layer may be provided for easily peeling off the transfer base material. Since the release layer can be the same as that generally known, the description here is omitted.

If necessary, the transmissive screen of the present invention may be formed by being curved so as to have a concave curved surface whose center is recessed when viewed from the observer side, that is, a curved surface which is convex toward the light source side. .. When obtaining a transmissive screen curved in this way, a transparent base material having a function as a support of the transmissive screen is usually formed into a curved shape so as to have a curved surface, and then the curved transparent base material is obtained. A method of laminating a pattern layer, a light diffusion layer, and a metal thin film layer on top of each other can be adopted. Examples of the method of molding the transparent base material into a curved shape so as to have a curved surface include an insert molding method and an injection molding method. The insert molding method and the injection molding method can be, for example, the same as those disclosed in Japanese Patent Application Laid-Open No. 2012-032513, and thus the description thereof will be omitted here.

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

The function of the surface functional layer in the present invention refers to at least one function such as a hard coat function, an antiglare function, an antireflection function, an antistatic function, an ultraviolet absorbing function, and an antifouling function. In the present invention, it is preferable that the surface functional layer is a surface protective layer having a hard coat function.

The surface protective layer in the present invention preferably has a predetermined hardness. As a specific hardness, for example, it is preferable that the hardness is "HB" or higher in the pencil hardness test defined by JIS K 600-5-4 (1994). This is because the surface protective layer can exert a desired hard coat function.

As the material of the surface protective layer in the present invention, for example, it is preferable that the material exhibits a desired hard coat function and can protect the transmissive screen of the present invention. The specific surface protective layer material preferably contains, 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. When imparting other functions to the surface protective layer in the present invention, additives and the like can be appropriately contained in the surface protective layer in addition to the above materials.

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

7. Others The physical characteristics and uses of the transmissive screen will be described below.

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

The transmissive screen of the present invention preferably has a predetermined transparency. As the specific transparency of the transmissive screen, for example, the total light transmittance is preferably 60% or more, particularly preferably 80% or more, and particularly preferably 90% or more. The total light transmittance of the transmissive screen can be measured according to, for example, JIS K7361-1: 1997.

(2) Applications The transmissive screen of the present invention has, for example, the following applications. It can be used as an advertisement by sticking it on the inside of the glass surface or the outside of the glass surface of a show window via an adhesive layer.

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

B. Back-projection display device The rear-projection display device of the present invention includes a video light source that emits video light and the transmissive screen that transmits the video light from the video light source and emits it to the observation side. It is a device.

The description of the drawings of the back projection type display device of the present invention can be the same as that of FIGS. 1 (a) and 1 (b) described above, and thus 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 no image light is projected by having the above-mentioned transmissive screen, and is a light diffusion layer. It is possible to provide a back projection type display device capable of suppressing a decrease in visibility due to a viewing angle and suppressing a decrease in visibility due to the use of a light diffusion layer. The detailed description of the effect of the present invention can be the same as that described in the above section "A. Transmissive screen", and thus the description thereof is omitted here.

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

1. 1. Transmissive screen The transmissive screen of the present invention is the same as the member described in the above section "A. Transmissive screen". That is, the transmissive screen in the present invention is a member that transmits the image light projected from the light source side to the observation side and displays the image, and is arranged on the pattern layer and the surface of the pattern layer on the light source side. The metal thin film layer is provided, and the pattern layer and the metal thin film layer have a patterned opening in a region where they overlap in a plan view, and are between the pattern layer and the metal thin film layer, and the opening and the flat surface. It is a member having a light diffusion layer arranged in visually overlapping regions.

Since each member constituting the transmissive screen in the present invention can be the same as the content described in the above section "A. Transmissive screen", the description here is omitted.

2. Video light source The video light source in the present invention is a member that emits video light.

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

As the image light source in the present invention, a conventionally known light source, for example, a Light Emitting Side called an LED, a small light source such as a pico projector using a laser, a single tube type light source using a DMD, or the like is used. be able to. Further, the image light source in the present invention may be a member having a luminaire and a luminaire cover covering the luminaire, and a pattern to be displayed as image light is drawn on the luminaire cover. Further, the image light source in the present invention may be a member provided with a fixed image obtained by printing a transparent film with high transparency and a light-shielding portion, such as an OHP sheet. In this case, for example, when the light emitted from the white light source passes through the fixed image, the transmitted light becomes the color of the fixed image, while a part of the light emitted from the white light source is blocked by the light-shielding portion. .. In this way, a member having a fixed image, a light-shielding portion, and a monochromatic light source, which is transmitted by illuminating the monochromatic light source from the back with respect to a member (masking) that displays light and dark by the fixed image and the light-shielding portion, is an image. The transmitted light may be projected onto a transmissive screen as a light source.

3. 3. Applications The applications of the back projection type display device of the present invention will be described.

Applications of the rear projection type display device of the present invention include, for example, applications for interior and exterior of automobiles. Specific examples thereof include display indicators, warning lamps, room lamps, foot lamps, illumination lamps, vehicle side lights, headlights, tail lamps, blinkers, and the like.

Further, examples of the use of the back projection type display device of the present invention include applications to residential and commercial facilities. Specific examples include applications such as information boards, advertisements, and signboards as displays, lighting fixtures, windows, show windows, etc. for daylighting or lighting, and further, embedded displays such as walls, doors, and partitions. Can be mentioned.

Further, as an application of the back projection type display device of the present invention, for example, an application to furniture can be mentioned. Specifically, it is used for decorating TVs, as a display for kitchens, bathrooms, bedrooms, doorphones, etc., furniture with embedded indicators, home appliances, desks, chairs, shelves, partitions, chests of drawers, geta boxes, beds, etc. .. Applications include vacuum cleaners, refrigerators, rice cookers, microwave ovens and washing machines.

Furthermore, applications of the rear projection type display device of the present invention include, for example, applications as warning displays for evacuation routes, fire alarms, warning lights, and the like.

The present invention is not limited to the above embodiment. The above-described embodiment is an example, and any object having substantially the same configuration as the technical idea described in the claims of the present invention and exhibiting the same effect and effect is the present invention. Is included in the technical scope of.

[Example]
As a transparent base material, a general-purpose acrylic film having a size of 200 mm × 300 mm was prepared. The thickness of the transparent substrate was 75 μm. Next, on one surface of the transparent substrate, a pattern layer, a pattern shading layer, and a light diffusing layer were printed in this order by using a flexographic printing method. At this time, in order to form a pattern-like opening in the pattern layer, the pattern light-shielding layer, and the light diffusion layer, each layer of the pattern layer, the pattern light-shielding layer, and the light diffusion layer was pattern-printed. The openings were formed by arranging non-printing portions having a diameter of 50 μm in a grid pattern at a pitch of 100 microns. The pattern layer was composed of two layers of general-purpose color ink, each having a thickness of 1 μm. Further, as the light diffusion layer, a resin in which titanium oxide was dispersed in a binder was used. 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 surface of the laminate composed of the pattern layer, the pattern light-shielding layer, and the light diffusion layer on the light diffusion layer side. Then, the dry film resist was patterned in an area smaller than the portion where the light diffusion layer was arranged. The pattern of the dry film resist was produced by a photolithography method using a general-purpose dry film resist having a thickness of 20 μm. Specifically, a hole having a diameter of 30 μm was formed with an alignment accuracy of 10 μm. Then, the aluminum thin film in the hole portion of the dry film resist was melted by an etching treatment, and then the dry film resist was peeled off to obtain a metal thin film layer in which an opening was formed.

Next, the light diffusing portion 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 diffusing part. The light diffusing portion was obtained by overprinting and printing so that the thickness was about 10 μm so as to fill the opening. From the above, a transmissive screen with the transparent base material side as the observation side was obtained.

A projector and a screen are arranged so that an image can be projected by a general-purpose projector (2000 ANSIlumen) from the surface of the transmissive screen opposite to the transparent base material, and the bright room (brightness of 700 lp) is arranged from the surface of the transmissive screen opposite to the transparent substrate. Observed at. As a result, when the projector was turned 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 an appropriate scattering and a wide viewing angle could be observed.

1 ... Picture layer 2 ... Light diffusion layer 3 ... Metal thin film layer 4 ... Transparent base material 10 ... Video light source 20 ... Observer 100 ... Transmissive screen L ₁₀ ... Video light L ₂₀ ... External light R1 ... Opening R2 ... Closing part

Claims (6)

A transmissive screen that displays an image by transmitting the image light projected from the light source side to the observation side.
Picture layer and
A metal thin film layer arranged on the surface of the pattern layer on the light source side is provided.
The pattern layer and the metal thin film layer have a patterned opening in a region where they overlap in a plan view.
Wherein possess between, and a light diffusion layer disposed in a region that overlaps on the opening and the plan view of the pattern layer and the metal thin film layer,
The metal thin film layer is a transmissive screen ^{having a reflection intensity L *} value of 50 or more on the surface on the pattern layer side. The light diffusing layer arranged in a region that overlaps the opening in a plan view is used as a first light diffusing portion, and the light diffusing layer arranged between the pattern layer and the metal thin film layer is used as a second light diffusing portion. The transmissive screen according to claim 1, wherein the first light diffusing portion and the second light diffusing portion are integrated. The light diffusing layer arranged in a region that overlaps the opening in a plan view is used as a first light diffusing portion, and the light diffusing layer arranged between the pattern layer and the metal thin film layer is used as a second light diffusing portion. The transmissive screen according to claim 1, wherein the first light diffusing portion and the second light diffusing portion are separate bodies. A transmissive screen that displays an image by transmitting the image light projected from the light source side to the observation side.
A laminate having the pattern layer according to any one of claims 1 to 3, the metal thin film layer, and the light diffusion layer is provided.
The laminated body is a transmissive screen having a curved shape in which the surface on the observation side forms a three-dimensional curved surface. A Fresnel lens layer arranged on the surface of the laminate on the light source side is provided.
The transmissive screen according to claim 4, wherein the Fresnel lens layer has a curved shape in which the surface on the observation side forms a three-dimensional curved surface. An image light source that emits image light and
A rear projection display device including the transmissive screen according to any one of claims 1 to 5, which transmits the video light from the video light source and emits it to the observation side.

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