JP6880906B2 - 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 to display 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. This transmissive screen can display an image that 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.

In recent years, a technique has been proposed in which a predetermined pattern is displayed from the observation 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 portion for displaying a predetermined pattern is arranged on the observation side surface of the transmissive screen. Further, it is disclosed that a large number of openings are formed in a plan view of the pattern portion arranged on the observation side of the transmissive screen. By forming a large number of openings in the plan view of the pattern portion, 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

When the transmissive screen as described above is observed from the observing side, the image can be visually recognized by the transmitted image light. By the way, when visually recognizing an image displayed by a transmissive screen, there is a problem that the visibility is lowered depending on the viewing angle. Therefore, recently, in order to control the viewing angle of the image displayed on the observation side, a technique of providing a light diffusing portion on the transmissive screen has been proposed. When a light diffusing portion is provided on the transmissive screen, a surface on the light source side of the transmissive screen or a surface on the observation side of video light is proposed as a position where the light diffusing portion is arranged.

The present inventors have repeatedly studied the visibility of a transmissive screen having such a light diffusing portion. As a result, when the light diffusing portion is arranged on the observation side surface of the transmissive screen, the pattern displayed by the pattern portion becomes white and blurred when the image light is not projected, which poses a problem in visibility. It turned out to occur. Further, when the light diffusing portion is arranged on the surface of the transmissive screen on the light source side of the image light, the efficiency of transmitting the image light through the transmissive screen, that is, the so-called transmission efficiency of the image light, is lowered, and there is a problem in visibility. It turned out to occur.

The present invention has been made in view of the above problems, and is a transmissive screen capable of displaying a predetermined image when no image light is projected, and is visually recognized by a viewing angle using a light diffusing unit. An object of the present invention is to provide a transmissive screen capable of suppressing a decrease in property and solving the above-mentioned problems of visibility due to the use of a light diffusing unit.

The present invention is a transmissive screen that displays an image by transmitting the image light projected from the light source side to the observation side, has a shading function that blocks the light incident from the observation side, and displays a pattern on the observation side. Provided is a transmissive screen including an optical functional layer having a pattern function and having a patterned opening, and a patterned light diffusing portion arranged in the opening of the optical functional layer.

According to the present invention, since the light diffusing portion is arranged at a predetermined position, it is a transmissive screen capable of displaying a predetermined image when no image light is projected, and the light diffusing portion is provided. It is possible to suppress the decrease in visibility due to the viewing angle by using the light diffusing unit, and to solve the above-mentioned problem of visibility due to the use of the light diffusing portion.

In the present invention, the optical functional layer has a picture portion having a picture function and a light-shielding part having a light-shielding function, and the picture part and the light-shielding part are laminated so that the picture part is on the observation side. Is preferable. Since the optical functional layer has a pattern portion and a light-shielding portion, the degree of freedom of the pattern displayed by the pattern portion is increased, and more excellent design can be exhibited.

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, and includes a laminate having the above-mentioned optical functional layer and a light diffusing portion. The laminated body preferably 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, by having the above-mentioned transmissive screen, it is a rear projection type display device capable of displaying a predetermined image when no image light is projected, and a visual field using a light diffusing unit. It is possible to provide a rear projection type display device capable of suppressing a decrease in visibility due to an angle and suppressing a decrease in visibility due to the use of a light diffusing unit.

The present invention is a transmissive screen capable of displaying a predetermined image when no video light is projected, and uses a light diffusing unit to suppress a decrease in visibility due to a viewing angle and a light diffusing unit. It is possible to provide a transmissive screen capable of solving the above-mentioned problem of visibility by using the above.

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 a process drawing which shows an example of the manufacturing method of the transmissive screen of this invention. It is a process drawing which shows another example of the manufacturing method of the transmissive screen of this invention. It is an enlarged view of the region X shown in FIG. 6 (b). 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.

A. 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 has a light blocking function that blocks the light incident from the observation side and the observation side. It is a member having a pattern function for displaying a pattern on the surface and having an optical functional layer having a patterned opening and a patterned light diffusing portion arranged in the opening of the optical functional layer.

At least a part of the laminate having the optical functional layer and the light diffusing portion 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 curved surface that is convex to the 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. 3 shown in the present specification are examples in which the transmissive screen is not curved. Further, the laminated body in the present invention refers to a configuration including an optical functional layer and a light diffusing portion, and does not refer only to a configuration in which some members are laminated.

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.

The transmissive screen 100 of the present invention shown in FIGS. 1 (a) and 1 (b) can display a picture drawn on the picture portion 1a described later from the observation side even when the image light is not projected. .. Further, as shown in the enlarged view of FIG. 1A and FIG. 1B, the transmissive screen 100 has a large number of openings R in a plan view, so that when the image light L ₁₀ is projected, the transmissive screen 100 has a large number of openings R. The image light L ₁₀ can be transmitted through the opening R to display the image on the observation side.

The transmissive screen 100 of the present invention shown in FIGS. 1 (a) and 1 (b) has the following configuration. That is, the transmissive screen 100 of the present invention shown in FIGS. 1 (a) and 1 (b) has a light-shielding function of blocking light incident on one surface side of the transparent base material 3 from the observation side of the transmissive screen 100. An optical functional layer 1 having a pattern function for displaying a pattern on the observation side and having a patterned opening R is provided. Further, the opening R of the optical functional layer 1 is provided with a patterned light diffusing portion 2. Further, a surface functional layer 4 is provided on the observation side surface of the optical functional layer 1 and the light diffusing portion 2. The optical functional layer 1 shown in FIGS. 1A and 1B shows an example having a three-layer structure of a picture portion 1a having a picture function, a picture light-shielding part 1b having a light-shielding function, and a light-shielding part 1c. ..

According to the present invention, the following effects are obtained by arranging the light diffusing portion in the opening of the optical functional layer. First, the conventional transmissive screen has a configuration in which the light diffusing portion is arranged on the surface on the light source side or the surface on the observation side. 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.

FIG. 8B is a schematic cross-sectional view showing an example in which the light diffusing portion 2 is arranged on the observation side surface of the transmissive screen 100'. As shown in FIG. 8B, when the light diffusing portion 2 is arranged on the observation side surface of the transmissive screen 100', the image light L ₁₀ passes through the opening R and is diffused by the light diffusing portion 2. Will be done. As a result, when the image light L ₁₀ is projected onto the transmissive screen 100'as shown in FIG. 8A, it is considered that the visibility of the image by the observer 20 is improved. On the other hand, as shown in FIG. 8B, when the light diffusing portion 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 optical functional layer 1 having a light-shielding function, and is _{diffused by the light diffusing unit 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 unit 2.} It may look blurry.

Further, FIG. 8C is a schematic cross-sectional view showing an example in which the light diffusing portion 2 is arranged on the surface of the transmissive screen 100'on the light source side. As shown in FIG. 8 (c), when the light diffusing unit 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 unit 2. It is diffused. As a result, a part of the image light L ₁₀ that should be incident on the opening R becomes stray light, and the stray light is incident on the optical functional layer forming region in which the optical functional layer 1 adjacent to the opening R is formed. There is. At this time, there arises a problem that the light incident on the optical functional layer forming region is reflected by the optical functional 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.

As a result of repeated studies on the above-mentioned problems, the inventors of the present invention set the light diffusing portion at a predetermined position so that the pattern can be visually recognized well and the image light is projected when the image light is not projected. I got a new finding that the image by the image light can be seen well when doing so. The present invention has been made based on such findings.

That is, as shown in FIGS. 1A and 1B, the present invention has the above-mentioned problems by forming the light diffusing portion 2 in the patterned opening R formed in the optical functional layer 1. Can be resolved. Specifically, as shown in FIG. 1 (a), when the projected image light L ₁₀ on the transmissive screen 100, as shown in FIG. 1 (b), incident from the observation side on the transmissive screen 100 The external light L ₂₀ is reflected by the optical functional layer 1 having a light-shielding function, and is emitted from the surface on the side where _{the external light L 20 is incident.} At this time, as described in FIG. 8B, when the external light L ₂₀ is reflected by the optical functional layer 1 having a light-shielding function and is emitted from the surface on the side where _{the external light L 20 is incident, the light is emitted.} The phenomenon of being diffused by the diffusing unit 2 can be suppressed. As a result, when the image light L ₁₀ is not projected onto 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 unit 2.} It is possible to solve the problem that the image looks blurry.

Further, in the present invention, as shown in FIG. 1B, the image light L ₁₀ incident on the transmissive screen 100 is diffused by the light diffusing unit 2 after being incident on the opening R. Therefore, it is possible to prevent a part _{of the image light L 10} that should be incident on the opening R from becoming stray light. As a result, as described in FIG. 8C, the stray light is incident on the optical functional layer forming region where the optical functional layer 1 adjacent to the opening R is formed and reflected, and the transmissive screen 100' It is possible to suppress the phenomenon that the light is emitted from the light source side. According to the present invention as described above, as a result, it is possible to solve the problem that the transmission efficiency of the image light transmissive screen is lowered and the visibility of the image light is impaired.

Further, the transmissive screen of the present invention has the following effects by providing the light diffusing portion in a pattern. That is, with the recent proposals for various uses of the transmissive screen, attempts have been made to make the transmissive screen thinner. When the conventional transmissive screen 100'shown in FIGS. 8 (b) and 8 (c) is made thinner, it is assumed that the thickness of the light diffusing portion 2 is made thinner, for example. However, since the light diffusing function of the light diffusing portion is caused by the thickness of the light diffusing portion, there is a limit to reducing the thickness of the light diffusing portion. On the other hand, in the case of the transmissive screen of the present invention, as shown in FIG. 1 (b), the light diffusing portion 2 can be formed in a pattern in the opening of the optical functional layer 1, so that the light diffusing portion 2 can be formed. The thickness of the above can be secured by the amount corresponding to the thickness of the optical functional layer 1. Therefore, according to the present invention, as compared with the conventional transmissive screen 100'shown in FIGS. 8 (b) and 8 (c), the transmissive screen having a thin thickness while maintaining the light diffusing function of the light diffusing portion 2. Can be.

Furthermore, the transmissive screen of the present invention can form light diffusing portions in a pattern. Therefore, it is less likely to be affected by the difference in moldability of each member constituting the transmissive screen. Specifically, it is possible to prevent damage such as tearing of each member during three-dimensional molding, and to suppress the occurrence of defects such as distortion in the shape of each member.

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

1. 1. Light diffusing part The light diffusing part in the present invention is a patterned member arranged in the opening of the optical functional layer described later.

The light diffusing portion in the present invention is usually a member having light transmission. The light transmission of the light diffusing portion is preferably such that when the image light is projected onto the transmissive screen of the present invention, the video light can pass through the light diffusing portion. Here, as the specific light transmittance of the light diffusing portion, 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 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. The total light transmittance of the light diffusing portion can be measured by, for example, a method based on JIS K7361-1: 1997.

The light diffusing portion in the present invention can be obtained, for example, by dispersing a particulate light diffusing material in a transparent resin. In the present invention, 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. is there.

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 diffusing part 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 in the light diffusing portion 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 particularly 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 that is visually recognized by transmitting the image light through the light diffusing portion is lowered. 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 portion 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 part is the refractive index of the transparent resin used in the light diffusing part, 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 part. , 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 portion has the above lower limit, the light diffusing portion can exhibit a desired light diffusing function. Further, when the content of the particulate light diffusing material in the light diffusing portion has the above upper limit, it is possible to suppress a decrease in the light transmittance of the light diffusing portion.

The thickness of the light diffusing portion can be appropriately adjusted according to the average particle diameter and content of the particulate light diffusing material used in the light diffusing portion, the refractive index of the transparent resin, the refractive index of the light diffusing material, and the like. In the present invention, it is preferable that the light diffusing portion has a thickness sufficient to exhibit a desired light diffusing function. The specific thickness of the light diffusing portion 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 portion has the above lower limit, the light diffusing portion can exhibit a desired light diffusing function. Further, since the thickness of the light diffusing portion has 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 portion here refers to the distance at which the length of the light diffusing portion in the thickness direction is maximized.

The light diffusing portion in the present invention preferably has a thickness sufficient to exhibit a desired light diffusing function as described above, but at that time, for example, as shown in FIG. 2, the thickness of the light diffusing portion 2 May be thicker than the thickness of the adjacent optical functional layer 1. Note that FIG. 2 shows an example in which the light diffusing portion 2 protrudes from the surface of the light diffusing portion 2 and the optical functional layer 1 on the observation side. For example, it is shown in FIGS. 6 (b) and 7 which will be described later. As described above, the light diffusing portion 2 may protrude on the surface of the light diffusing portion 2 and the optical functional layer 1 on the light source side.

The light diffusing portion preferably has a predetermined haze value. The specific haze value of the light diffusing portion is, for example, preferably in the range of 60% or less. When the haze value of the light diffusing portion 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 diffusing portion can be measured according to, for example, JIS K7105: 1981.

2. Optical functional layer The optical functional layer in the present invention is a member having a light-shielding function of blocking light incident from the observation side and a pattern function of displaying a pattern on the observation side, and having a patterned opening.

Here, the "shading function that blocks the light incident from the observation side" is, for example, when the image light is not projected on the transmissive screen by transmitting the light incident from the observation side through the optical functional layer. It means that the light-shielding function does not reduce the visibility of the pattern displayed by the optical function layer. 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 30% or less, and in particular, in the range of 15% or less. It is preferably in the range of 5% 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.

Further, the "picture function of displaying a picture on the observing side" means a function of displaying a predetermined picture when observing the optical functional layer from the observing side. The pattern here can be appropriately selected depending on the use of the transmissive screen of the present invention, and is not particularly limited.

The optical functional layer in the present invention is a member having a patterned opening. As shown in FIGS. 1A and 1B, a large number of patterned openings included in the optical functional layer are usually formed in a plan view of the optical functional layer 1. 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 optical functional layer, the area ratio of the opening area to the other area 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. When the area ratio is sufficiently visible and the image light is not projected on the transmissive screen, the observer can sufficiently view the pattern displayed by the pattern function of the optical functional layer from the observation side. It is preferable that the area ratio is such that it can be visually recognized. Therefore, in the plan view of the optical functional 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 optical functional 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 optical functional 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 optical functional layer is preferably a size that satisfies the above-mentioned area ratio. When the plan view shape of the opening is circular, the diameter can be, for example, 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 portion 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 opening in the optical functional layer is a grid pattern, the specific size of the opening 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 optical functional 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 thickness of the optical functional layer in the present invention may be such that it has the above-mentioned light-shielding function and pattern function. The specific thickness of the optical functional layer can be appropriately adjusted according to the thickness of the pattern portion and the light-shielding portion constituting the optical functional layer, and thus the description thereof will be omitted.

The optical functional layer in the present invention may have the above-mentioned light-shielding function and pattern function. Such an optical functional layer may be composed of, for example, a single layer having both a light-shielding function and a pattern function, or includes at least a layer having a light-shielding function and a layer having a pattern function. It may be composed of a plurality of layers. That is, the optical functional layer in the present invention may have a pattern portion having a pattern function and a light-shielding portion having a light-shielding function. At this time, the pattern portion and the light-shielding portion are stacked in order from the observation side.

Here, "the pattern portion and the light-shielding portion are stacked in order from the observation side" means that when the observer observes the transmissive screen, a predetermined pattern drawn on the pattern portion can be visually recognized. It means that the pattern portion is arranged in, and the light-shielding portion is arranged on the surface of the pattern portion on the light source side. At this time, other members may be provided between the pattern portion and the light-shielding portion, if necessary. Examples of other members include a pattern shading portion. Since the description of the picture shading part will be described later, the description here will be omitted.

Hereinafter, the light-shielding portion and the pattern portion constituting the optical functional layer will be described.

(1) Light-shielding part The light-shielding part in the present invention is a layer having a light-shielding function. That is, for example, as shown in FIG. 1B, the light-shielding portion 1c is arranged on the light source side of the optical functional layer 1, and the image light L ₁₀ can be suppressed from passing through the optical functional layer 1. .. Since the image light does not pass through the optical functional layer, it is possible to suppress the image light from being colored by the pattern function of the optical functional layer, and to suppress the deterioration of the visibility of the image by the observer.

The material of the light-shielding portion is not particularly limited as long as it can exhibit a desired light-shielding function. For example, a resin material containing a light absorbing material or a coloring material can be mentioned. Examples of the light absorbing material include metal salts such as carbon black, graphite, and black iron oxide. Examples of the coloring material include dark-colored dyes and pigments such as gray and black. Further, examples of the resin material include methyl methacrylate / butadiene / styrene resin, acrylic resin, polycarbonate resin, polyethylene terephthalate resin and the like.

The thickness of the light-shielding portion is preferably such that the desired light-shielding function can be exhibited. The specific thickness of the light-shielding portion is, for example, preferably in the range of 10 μm or more and 200 μm or less, and particularly preferably in the range of 30 μm or more and 150 μm or less. When the thickness of the light-shielding portion is within the above range, the desired light-shielding function can be exhibited and the thickness of the optical functional layer can be suppressed from increasing.

Since the total light transmittance of the light-shielding portion can be the same as that described in the description of the light-shielding function described above, the description here is omitted.

(2) Picture part The picture part in the present invention is a layer having a picture function. That is, as shown in FIG. 1B, the pattern portion 1a is arranged on the observation side most in the optical functional layer 1, and the pattern can be displayed on the observation side when _{the image light L 10 is not projected.} it can.

The material of the pattern portion 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 portion. 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 threne 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 a filler, a plasticizer, a dispersant, a lubricant, an antistatic agent, an antioxidant, and an antifungal agent can be appropriately used as the material of the pattern portion, if necessary.

The thickness of the pattern portion can be appropriately adjusted according to the pattern displayed by the pattern portion, the use and size of the transmissive screen, and the like. The specific thickness of the pattern portion 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.

(3) Picture light-shielding portion The optical functional layer in the present invention may have a pattern light-shielding portion, if necessary. The pattern shading portion is a layer for suppressing the pattern of the above-mentioned pattern portion from being seen through, and is a layer having a so-called lining function. As shown in FIG. 1B, the pattern light-shielding portion 1b can be arranged between the pattern portion 1a and the light-shielding portion 1c. By having the pattern shading portion, it is possible to suppress the pattern displayed by the pattern portion from being transparent and to suppress the deterioration of the visibility of the pattern.

The pattern shading portion in the present invention is suitable, for example, when the color of the pattern displayed by the pattern portion is light. When the hue of the pattern displayed by the pattern portion is light, it is necessary to increase the thickness of the pattern portion in order to prevent the pattern from being seen through. On the other hand, if the thickness of the pattern portion becomes too thick, the thickness of the transmissive screen itself tends to increase. In such a case, by providing the pattern shading portion, it is possible to suppress the pattern from being seen through without increasing the thickness of the pattern portion.

As the material of the pattern shading portion, it is preferable that the material is such that the pattern displayed by the pattern portion can be suppressed from being seen through. Examples of the material of the pattern portion include a resin material containing a coloring material. The color tone of the coloring material used for the pattern shading portion can be appropriately selected according to the color tone of the pattern displayed by the pattern portion, and a generally known coloring material is used as a specific material. Therefore, the description here is omitted. Further, since the resin material used for the pattern light-shielding portion can be the same as the resin material described in the above-mentioned "(1) Light-shielding portion", the description here is omitted.

It is preferable that the thickness of the pattern shading portion is such that the function of suppressing the pattern displayed by the pattern portion from being seen through can be exhibited. Further, the thickness of the pattern shading portion can be appropriately adjusted according to the color tone and the like exhibited by the pattern shading portion. The specific thickness of the pattern shading portion is, for example, preferably in the range of 1 μm or more and 30 μm or less, and particularly preferably in the range of 3 μm or more and 15 μm or less.

3. 3. Fresnel lens layer The Fresnel lens layer in the present invention is a member arranged on the surface of the laminate having an optical functional layer and a light diffusing portion 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. 3, 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 a 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 "1. Light diffusing part", the description here is omitted.

4. 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. 1 (b), the transparent base material 3 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, the optical functional layer 1 and the light diffusing portion 2 can be arranged on the transfer base material 7 as the transparent base material 3, for example, as in the transmissive screen 100 shown in FIG. 4 (a). Further, since the transmissive screen 100 shown in FIG. 4A is designed to use the side on which the transfer base material 7 is arranged as the observation side of the transmissive screen, the optical functional layer 1 is viewed from the transfer base material 7 side. The picture portion 1a, the picture light-shielding part 1b, and the light-shielding part 1c are laminated. Further, in the transmissive screen 100 shown in FIG. 4 (a), as shown in FIG. 4 (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. 4A and 4B, when the transparent base material 3 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. 4A and 4B, the observation side of the transmissive screen 100 is provided with a hard coat function as a surface functional layer 4 for protecting the observation side surface of the optical functional layer 1. The surface protective layer 4a 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. On top of that, it is possible to adopt a method in which the optical functional layer and the light diffusing portion are made to follow and laminated. 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.

5. 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. 1B, the surface functional layer 4 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.

6. Others The physical properties of the transmissive screen and the manufacturing method will be described below.

(1) Physical Properties 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 portion, the content of the particulate light diffusing material contained in the light diffusing portion, 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) 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. Can be done. For example, there is a method of manufacturing the transmissive screen of the present invention by first arranging an optical functional layer on a base material in a pattern and then forming a light diffusing portion in a region where the base material is exposed. Alternatively, a light diffusing base material in which the light diffusing portion is arranged in a pattern is formed on the base material, and then, on the surface of the light diffusing base material on the side where the light diffusing portion is arranged, optical is applied to the region where the base material is exposed. A method of manufacturing the transmissive screen of the present invention by forming a functional layer by a printing method can be mentioned. In addition, a transfer method can also be used when laminating each layer. For example, the optical functional layer is formed on the entire surface of the release film or the like in advance, and then the adhesive layer is formed in a pattern on the surface of the optical functional layer opposite to the release film or the like. The patterned adhesive layer formed at this time serves as an opening in the optical functional layer formed later. Therefore, it is preferable to form the adhesive layer according to the size of the opening formed in the optical functional layer. Subsequently, a patterned adhesive layer is attached to the base material, and the release film or the like is peeled off from the optical functional layer, whereby the region where the adhesive layer is formed is transferred to the base material in the optical functional layer, and the opening is opened. The formed optical functional layer can be formed. As another method, for example, on the surface of the base material to be transferred, by performing a mold release treatment on the region corresponding to the opening of the optical functional layer, the optical functional layer is not transferred only in the region, and the opening It is possible to form an optical functional layer having the above. In the present invention, from the viewpoint of simplifying the manufacturing process, in particular, a light-diffusing base material in which light-diffusing parts are arranged in a pattern is formed on the base material, and then the light-diffusing part of the light-diffusing base material is arranged. It is preferable to adopt a method of forming an optical functional layer on the surface on the side where the base material is exposed by a printing method.

Hereinafter, a light diffusing base material in which light diffusing parts are arranged in a pattern is formed on the base material, and then, on the surface of the light diffusing base material on the side where the light diffusing part is arranged, optical is applied to a region where the base material is exposed. The method for manufacturing a transmissive screen of the present invention, which manufactures a transmissive screen by forming a functional layer by a printing method, will be described.

That is, the method for manufacturing a transmissive screen of the present invention is a method for manufacturing a transmissive screen that displays an image by transmitting the image light projected from the light source side to the observation side and displays a pattern on the base material. A preparatory step for preparing a light diffusing base material on which the light diffusing portion is arranged, and a light shielding function for blocking light incident on the surface of the light diffusing base material on the side where the light diffusing portion is arranged from the observation side. It also has an optical functional layer forming step of forming an optical functional layer having a pattern function for displaying a pattern on the observation side in a pattern, and the optical functional layer forming step is the light diffusing of the light diffusing base material. This is a step of applying a coating liquid for forming an optical functional layer for forming the optical functional layer in a pattern to a region where the base material is exposed on the side where the portion is arranged, and is a coating for forming the optical functional layer. The working liquid is applied in a pattern due to the difference in wettability between the exposed region of the base material on the side where the light diffusing portion is arranged and the light diffusing portion of the light diffusing base material. is there.

The method for manufacturing the transmissive screen of the present invention will be described with reference to the drawings. 5 (a) and 5 (b) are process diagrams showing an example of the method for manufacturing a transmissive screen of the present invention. As shown in FIG. 5A, the method for manufacturing a transmissive screen of the present invention includes a preparatory step of preparing a light diffusing base material 12 in which a patterned light diffusing portion 2 is arranged on the base material 6. .. Further, in the present invention, as shown in FIG. 5B, after the preparatory step, the light incident on the surface of the light diffusing base material 12 on which the light diffusing portion 2 is arranged is shielded from light incident from the observation side. It has an optical functional layer forming step of forming an optical functional layer 1 having a function and a pattern function of displaying a pattern on the observation side in a pattern. The optical functional layer forming step in the present invention is for forming an optical functional layer 1 in a region of the light diffusing base material 12 on the side where the light diffusing portion 2 is arranged where the base material 6 is exposed. This is a process of applying the coating liquid in a pattern. Further, the coating liquid for forming the optical functional layer is based on the difference in wettability between the exposed region of the base material 6 on the side where the light diffusing portion 2 is arranged and the light diffusing portion 2 of the light diffusing base material 12. It is applied in a pattern. Note that FIGS. 5A and 5B show an example in which the base material 6 is the transparent base material 3. Therefore, in the cases of FIGS. 5A and 5B, the base material 6 side becomes the light source 10 side, and the optical functional layer 1 has the light-shielding portion 1c, the pattern light-shielding portion 1b, and the pattern portion in order from the base material 6 side. 1a is laminated. Reference numerals not described in FIGS. 5A and 5B can be the same as those in FIGS. 1A and 1B described above, and thus the description thereof will be omitted here.

6 (a) and 6 (b) are process diagrams showing another example of the method for manufacturing a transmissive screen of the present invention. 6 (a) and 6 (b) show an example in the case where the base material is the surface functional layer 4. Therefore, in the cases of FIGS. 6A and 6B, the base material 6 side becomes the observation side of the observer 20, and the optical functional layer 1 has the pattern portion 1a and the pattern shading portion 1b in this order from the base material 6 side. And the light-shielding portion 1c are laminated. Since other explanations of FIGS. 6 (a) and 6 (b) can be the same as those of FIGS. 5 (a) and 5 (b), the description thereof is omitted here.

In the present invention, as shown in FIGS. 6A and 6B, when the base material 6 is the surface functional layer 4, the thickness of the light diffusing portion 2 is designed to be thicker than the thickness of the optical functional layer 1. be able to. FIG. 7 is an enlarged view of the region indicated by reference numeral X in FIG. 6B, but as shown in FIG. 7, the light diffusing portion 2 may protrude from the surface of the optical functional layer in a convex shape. This is because the thickness of the light diffusing portion makes it possible to make the viewing angle characteristic by providing the light diffusing portion remarkable.

The method for manufacturing a transmissive screen of the present invention includes a preparatory step for preparing a light diffusing base material and an optical functional layer forming step, so that a transmissive screen having a predetermined configuration can be obtained by a simple method. Specifically, in the process of forming the optical functional layer, the optical functional layer is formed due to the difference in wettability between the exposed region of the base material on the side where the light diffusing portion is arranged and the light diffusing portion of the light diffusing base material. Since the coating liquid for application can be applied in a pattern, the optical functional layer in the pattern can be easily formed. Further, since it is not necessary to align each layer constituting the optical functional layer, it is possible to obtain a high-quality transmissive screen with high position accuracy.

Hereinafter, the method for manufacturing the transmissive screen of the present invention described above will be described separately for each step.

(A) Preparation Step The preparation step of the present invention is a step of preparing a light diffusing base material in which a patterned light diffusing portion is arranged on the base material.

The base material in this step may be a transparent base material 3 as shown in FIGS. 5A and 5B, and a surface functional layer 4 as shown in FIGS. 6A and 6B. You may. The description of the base material, the light diffusing portion and the surface functional layer in this step is described in the above sections of "1. Light diffusing portion", "3. Transparent base material" and "5. Surface functional layer". Since it can be the same as the above, the description here is omitted.

In this step, the method of forming the light diffusing portion in a pattern on the base material is not particularly limited as long as it is a method of obtaining a desired light diffusing base material. Examples thereof include a method in which the paint dispersed in the particles is applied by a known method such as a gravure coat, a roll coat, a bead coat, a spray coat, and an inkjet, and dried.

(B) Optical functional layer forming step The optical functional layer forming step of the present invention has a light-shielding function of blocking light incident from the observation side on the surface of the light-diffusing base material on the side where the light-diffusing portion is arranged, and the observation side. This is a step of forming an optical functional layer having a pattern function for displaying a pattern in a pattern. Further, in the optical functional layer forming step, a coating liquid for forming an optical functional layer for forming the optical functional layer is applied to a region of the light diffusing base material on the side where the light diffusing portion is arranged where the base material is exposed. This is a step of applying in a pattern, and the coating liquid for forming an optical functional layer is a wettability between the exposed region of the light diffusing base material on the side where the light diffusing part is arranged and the light diffusing part. Depending on the difference, it can be applied in a pattern.

The description of the optical functional layer in this step can be the same as that described in the above section "2. Optical functional layer", and thus the description thereof is omitted here.

In this step, as a method of applying the coating liquid for forming an optical functional layer in a pattern to the exposed region of the light diffusing base material on the side where the light diffusing portion is arranged, for example, gravure coating , Roll coating, bead coating, spray coating, inkjet and other known methods. The coating liquid for forming the optical functional layer used in this step can be obtained by containing a solvent in the constituent material of the optical functional layer. As the solvent, a general solvent can be used, so the description here is omitted.

In this step, when the coating liquid for forming the optical functional layer is applied by the method described above, the surface on the side where the light diffusing portion of the light diffusing base material is arranged and the surface where the base material is exposed and the light diffusing part are Patterning can be performed depending on the difference in wettability. The "difference in wettability" as used herein means a region where the light diffusing portion is arranged when the coating liquid for forming the optical functional layer is applied to the surface of the light diffusing base material on the side where the light diffusing portion is arranged. It means a difference in wettability such that the coating liquid for forming an optical functional layer is selectively applied to a region other than the above.

The region where the base material is exposed and the light diffusing portion on the side where the light diffusing portion of the light diffusing base material is arranged have a predetermined difference in wettability as described above. As a method of expressing the difference in wettability, for example, a method of surface-treating the region where the base material is exposed on the side where the light diffusing portion of the light diffusing base material is arranged to develop positivity in the region Alternatively, a method of surface-treating the light diffusing portion to develop liquid repellency in the light diffusing portion can be mentioned.

(C) Other Steps The method for manufacturing a transmissive screen of the present invention may include other steps, if necessary, in addition to the steps described above.

In the present invention, for example, as shown in FIGS. 5A and 5B, when the base material 6 is the transparent base material 3, the surface functional layer is arranged on the observation side surface of the transmissive screen 100. It may have a step to do. The method for arranging the surface functional layer is not particularly limited as long as the surface functional layer can be arranged at a predetermined position, but for example, it is obtained by dissolving a material constituting the surface functional layer in a solvent. Examples thereof include a method in which the coating liquid for forming a surface functional layer is directly applied using a coater such as a micro gravure coater, a gravure coater, a die coater, a reverse coater, or a roll coater, and dried. After the coating liquid for forming the surface functional layer is dried, a light irradiation or heating step may be performed as needed.

In the present invention, for example, as shown in FIGS. 6A and 6B, when the base material 6 is the surface functional layer 4, the transparent base material is arranged on the surface of the transmissive screen 100 on the light source side. It may have a step to do. Examples of the method of arranging the transparent base material include a method of attaching the transparent base material by an adhesive layer. The adhesive layer used at this time can be the same as that of a general one that can be used for a screen, and thus the description thereof is omitted here.

B. Back-projection display device The rear-projection display device of the present invention includes a video light source that emits image light and the transmission 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 diffusing unit. 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 diffusing portion. 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 has a light blocking function that blocks the light incident from the observation side and the observation side. It is a member having a pattern function for displaying a pattern and having an optical functional layer having a patterned opening and a patterned light diffusing portion arranged in the opening of the optical functional layer.

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 lighting fixture and a lighting fixture cover covering the lighting fixture, and a pattern to be displayed as image light is drawn on the lighting fixture 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, a pattern portion, a pattern shading portion, and a shading portion were printed in this order on one surface of the transparent substrate by using a flexographic printing method to obtain an optical functional layer. At this time, in order to form a pattern-like opening in the optical functional layer, each layer of the pattern portion, the pattern shading layer, and the shading portion was printed in a pattern. 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 portion was composed of two layers of general-purpose color ink, each having a thickness of 1 μm. Further, a general-purpose white ink (containing a white pigment) was used for the pattern shading portion, and the thickness was 5 μm. Furthermore, general-purpose black ink (containing black pigment) was used for the light-shielding portion, and the thickness was 3 μm.

Next, the light diffusing portion was printed by flexographic printing in the opening of the obtained optical functional layer. 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.

The projector and screen are arranged so that the 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 lux) from the surface of the opposite side of the projector. 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 ... Optical functional layer 2 ... Light diffusing part 3 ... Transparent base material 4 ... Surface functional layer 10 ... Video light source 20 ... Observer 100 ... Transmissive screen L ₁₀ ... Video light L ₂₀ ... External light R ... Opening

Claims (5)

A transmissive screen that displays an image by transmitting the image light projected from the light source side to the observation side.
An optical functional layer that has a light-shielding function that blocks light incident from the observation side and a pattern function that displays a pattern on the observation side and has a patterned opening.
A patterned light diffusing portion arranged in the opening of the optical functional layer is provided.
The light diffusing portion is a transmissive screen arranged so as to project from the surface of the optical functional layer on the observation side. The optical functional layer has a pattern portion having a pattern function and a light-shielding portion having a light-shielding function.
The transmissive screen according to claim 1, wherein the pattern portion and the light-shielding portion are laminated so that the pattern portion is on the observation side. 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 optical functional layer according to claim 1 or 2 and the light diffusing portion 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 3, 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 4, which transmits the video light from the video light source and emits it to the observation side.

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