Rear-projection image display device

Abstract

A rear-projection image display device 1 of the present invention comprises: an image display unit (10) including a projection screen (11), a light-transmissive cushion material (12), and a transparent enclosure (13); and an image projection unit (20) including a rear image projection device (21). According to the present invention, it is possible to provide a rear-projection image display device which is capable of displaying information favorably using light and which provides a pleasant tactile sensation.

Description

Rear projection image display device

[0001] The present invention relates to a rear-projection type image display device.

[0002] Optical display components that display information using light are being actively developed in recent years from the perspective of improving their performance in various fields such as automotive applications, electronic equipment applications, consumer electronics, and building materials. Optical display components need to have excellent light transmittance in order to display information appropriately. Furthermore, since optical display components constitute part of the interior in various fields, they are required to maintain a flexible tactile feel and have a high-quality appearance. Examples of such optical display components that are known as prior art include the decorative sheet for image projection described in Patent Document 1, the interior trim element for car interiors described in Patent Document 2, and the optical display component described in Patent Document 3.

[0003] Japanese Patent Publication No. 2020-160381, Japanese Patent No. 5004976, International Publication No. 2022 / 210932, Brochure

[0004] As a projection device, a rear projection device is sometimes used, which does not require the projection device to be located on the image display side. When a rear projection device is used, for example, as part of an interior design, it is required to be able to display information well using light and to improve tactile sensation.

[0005] However, the decorative sheet for image projection described in Patent Document 1 is intended for use with front projection devices, and if applied directly to a rear projection device, it will not be able to properly display information using light. Similarly, Patent Documents 2 and 3 are not intended for use with projection devices, and if applied directly to a rear projection device, they will not be able to properly display information using light.

[0006] Therefore, the object of the present invention is to provide a rear-projection type image display device that can display information well using light and has a good tactile feel.

[0007] As a result of diligent research, the present inventors have found that a rear-projection image display device having a predetermined configuration can solve the above problems, and have completed the present invention as follows. That is, the present invention provides the following [1] to

[10] . [1] A rear-projection image display device comprising an image display unit including a projection screen, a light-transmitting cushioning material, and a transparent housing, and an image projection unit including a rear-image projection device. [2] The rear-projection image display device according to [1], wherein the light-transmitting cushioning material is a polymeric elastic material, and the durometer hardness of the light-transmitting cushioning material is 20 to 80 when measured with a Type A durometer compliant with JIS K6253-3, or 20 to 90 when measured with a Type E durometer compliant with JIS K6253-3. [3] The rear-projection image display device according to [1] or [2], wherein the image display unit further comprises an operation detection device having light transmittance. [4] The rear projection image display device according to any one of [1] to [3] above, wherein the projection screen is at least one type of fabric selected from the group consisting of woven fabrics, knitted fabrics and nonwoven fabrics. [5] The rear projection image display device according to any one of [1] to [4] above, wherein the projection screen is a fabric having a metal layer. [6] The metal layer is 1 μg / cm³ relative to the fabric. ２ 100 μg / cm or more ２ The rear projection image display device described in [5] above, wherein the following amounts of material are attached: [7] The rear projection image display device described in any one of [1] to [6] above, wherein the rear image projection device is a laser projector. [8] The rear projection image display device described in any one of [1] to [7] above, wherein the light-transmitting cushioning material is silicone rubber. [9] The rear projection image display device described in any one of [1] to [8] above, wherein the total light transmittance of the projection screen is 25% or less.

[10] The rear projection image display device described in any one of [1] to [9] above, wherein the image display section has a curved structure.

[0008] According to the present invention, it is possible to provide a rear-projection type image display device that can display information well using light and has a good tactile feel.

[0009] Figure 1 is a schematic diagram of a rear-projection image display device according to the first embodiment of the present invention. Figure 2 is a schematic diagram of a rear-projection image display device according to the second embodiment of the present invention. Figure 3 is a schematic diagram of a rear-projection image display device according to the third embodiment of the present invention. Figure 4 is a schematic diagram of a rear-projection image display device according to the fourth embodiment of the present invention.

[0010] <Rear-projection image display device of the first embodiment> The rear-projection image display device 1 of the first embodiment of the present invention will be described below with reference to Figure 1. As shown in Figure 1, the rear-projection image display device 1 of the first embodiment of the present invention comprises an image display unit 10 including a projection screen 11, a light-transmitting cushioning material 12, and a transparent housing 13, and an image projection unit 20 including a rear image projection device 21. The rear-projection image display device 1 of the first embodiment of the present invention, having the above configuration, can display information well using light and also have a good tactile feel. Furthermore, the projection screen 11 can provide good concealment when information using light is not displayed, for example, when the image display unit 10 is viewed from the front side (i.e., the image display side), the image projection unit 20 and other components located on the rear side can be appropriately concealed.

[0011] The rear-projection type image display device 1 of the first embodiment of the present invention uses a rear-image projection device 21 as the image projection device, so that information is not displayed by reflecting it onto the projection screen 11, but rather by transmitting information from the rear-image projection device 21 onto the projection screen 11. As a result, there is no reduction in contrast due to reflection of projected light on the screen, it can be used in a brightly lit room, and the information can be displayed well with light. Furthermore, since it is not necessary to place the image projection unit on the front side, when applied to interiors, it is not necessary to place the image projection unit on the outside.

[0012] The following describes in more detail each component constituting the rear projection type image display device 1. [Image display unit] As described above, the image display unit 10 includes a projection screen 11, a light-transmitting cushioning material 12, and a transparent housing 13. It is preferable that the image display unit 10 includes the projection screen 11, the light-transmitting cushioning material 12, and the transparent housing 13 in that order.

[0013] (Projection Screen) The projection screen 11 is a screen that transmits and displays the information projected by the image projection unit 20. The projection screen 11 is not particularly limited as long as it is in the form of a sheet and has light transmittance. Examples of the projection screen 11 include cloth, artificial leather, rubber sheets, and elastomer sheets such as thermoplastic elastomer sheets. By using cloth, artificial leather, or an elastomer sheet, the opacity of the projection screen 11 can be improved, and a flexible and pleasant tactile feel can be obtained.

[0014] The layer configuration of the projection screen 11 is not particularly limited. The projection screen 11 may be composed of a single substrate, or it may be a combination of two or more substrates. The projection screen 11 is preferably white. This makes it easier to adjust the color of the image display unit 10 by adjusting the color of the colored layer described later. In this invention, "white" refers to L as measured in accordance with JIS Z 8781-4:2013. ＊ a ＊ b ＊ In the color system, this refers to colors with an L value of 70 or higher. Furthermore, when using an elastomer sheet as the projection screen 11, the projection screen 11 may be gray or black from the viewpoint of light diffusion.

[0015] As the projection screen 11, it is preferable to use a substrate with relatively high light transmittance and / or relatively high haze, from the viewpoint of transmitting light while diffusing it, thereby reducing unevenness of light transmitted through the image display unit 10 when the image projection unit 20 is lit and improving the design. Cloth can be suitably used as such a substrate.

[0016] The fabric is not particularly limited as long as it is a base material containing fibers or fiber bundles as a material and is in the form of a sheet. The fabric may contain components other than fibers and fiber bundles, as long as the effects of the present invention are not significantly impaired. In that case, the total amount of fibers and fiber bundles in the fabric is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, particularly preferably 95% by mass or more, and especially preferably 99% by mass or more, and is usually less than 100% by mass. Examples of fabrics include woven fabrics (e.g., plain weave, twill weave, satin weave, etc.), knitted fabrics, nonwoven fabrics, etc. Among these, woven fabrics, knitted fabrics, and nonwoven fabrics are preferred from the viewpoint of transmitting and diffusing light, and reducing the unevenness of light transmitted through the image display unit 10 when the image projection unit 20 is lit, thereby improving the design. In one embodiment of the present invention, the fabric may have a napped surface on the side opposite to the light-transmitting cushioning material 12.

[0017] The fibers constituting the cloth are not particularly limited. For example, inorganic fibers such as carbon fibers (e.g., PAN-based carbon fibers, pitch-based carbon fibers, carbon nanotubes, etc.), glass fibers (e.g., glass wool, glass fibers, etc.), mineral fibers (e.g., chrysotile asbestos, anthophyllite asbestos, crocidolite asbestos, amosite asbestos, tremolite asbestos, actinolite asbestos, etc.), man-made mineral fibers (e.g., rock wool, ceramic fibers, etc.), metal fibers (e.g., stainless steel fibers, aluminum fibers, iron fibers, nickel fibers, copper fibers, etc.); organic fibers such as synthetic fibers (e.g., nylon fibers, polyester fibers, acrylic fibers, vinylon fibers, polyolefin fibers, polyethylene fibers, polypropylene fibers, polyurethane fibers, etc.), regenerated fibers (e.g., rayon, polynosic, cupra, lyocell, acetate, etc.), plant fibers (e.g., cotton fibers, hemp fibers, linen fibers, rayon fibers, polynosic fibers, cupra fibers, lyocell fibers, acetate fibers, etc.), animal fibers (e.g., wool, silk, tussah silk, mohair, cashmere, camel, llama, alpaca, vicuña, angora, spider silk, etc.) can be widely used. The form of the fibers may be any of continuous long fibers, short fibers obtained by cutting continuous long fibers, milled yarns pulverized into powder form, etc. The fibers may be single or in combination of two or more kinds.

[0018] The fiber bundle is not particularly limited as long as it consists of a plurality of fibers. The number of fibers constituting the fiber bundle is, for example, 10 or more, 100 or more, 500 or more, or 1000 or more, and also, for example, 50000 or less, 40000 or less, or 20000 or less.

[0019] The basis weight of the cloth is preferably 10 g / m ２ or more and 400 g / m ２ or less, more preferably 20 g / m ２ or more and 300 g / m ２ or less, still more preferably 90 g / m ２ or more and 250 g / m ２ or less, from the viewpoint of facilitating adjustment of the light transmittance as a base material, the light transmittance of the image display unit 10, the total light transmittance of the image display unit, etc. within a predetermined range. The method for measuring the basis weight of the cloth is as follows. Cut a 100 cm × 100 cm sample, measure the weight, and use the measured weight as the basis weight (g / m２ )

[0020] The total light transmittance of the cloth is preferably 0.5% to 30%, more preferably 1% to 25%, even more preferably 2% to 25%, and even more preferably 5% to 22%, from the viewpoint of making it easy to adjust the light transmittance as a projection screen 11, the light transmittance of the image display unit 10, and the total light transmittance of the image display unit 10 to a predetermined range. Furthermore, the haze of the cloth is preferably 40 or more, more preferably 50 or more, even more preferably 60 or more, even more preferably 70 or more, particularly preferably 80 or more, preferably 98 or less, particularly more preferably 85 to 98, especially even more preferably 90 to 96, and particularly preferably 90 to 95, from the viewpoint of making it easy to adjust the light transmittance as a projection screen 11, the light transmittance of the image display unit 10, and the total light transmittance of the image display unit 10 to a predetermined range, and from the viewpoint of reducing unevenness of light transmitted through the image display unit 10 when the image projection unit 20 is lit to enhance the design.

[0021] The artificial leather used in the projection screen 11 is a sheet-like material artificially made to mimic leather, and includes so-called synthetic leather. The artificial leather preferably contains at least one elastic polymer selected from the group consisting of polyurethane resin, olefin-based thermoplastic elastomer, and polyvinyl chloride resin.

[0022] The elastomer sheet used in the projection screen 11 does not need to be one that imitates leather, like the artificial leather described above. Examples of elastomer sheets include urethane rubber sheets, urethane-based thermoplastic elastomer sheets, and PVC-based thermoplastic elastomer sheets. To enhance light diffusion, the rubber-thermoplastic elastomer sheet preferably contains a pigment, and more preferably contains a pigment such as a black pigment.

[0023] The total light transmittance of the projection screen 11 is preferably 25% or less. This ensures opacity when no information using light is displayed. From the viewpoint of opacity, the total light transmittance of the projection screen 11 is preferably 20% or less, more preferably 15% or less, even more preferably 12% or less, even more preferably 10% or less, and particularly preferably 8% or less. Furthermore, since the projection screen 11 transmits and displays information, the total light transmittance of the projection screen 11 is preferably 0.5% or more, more preferably 1.0% or more, even more preferably 1.5% or more, even more preferably 2.0% or more, and particularly preferably 2.5% or more.

[0024] The haze of the projection screen 11 is preferably 40 or higher, more preferably 50 or higher, even more preferably 60 or higher, even more preferably 70 or higher, particularly preferably 80 or higher, preferably 98 or lower, particularly more preferably 85 to 98, particularly more preferably 90 to 96, and especially preferably 90 to 95, from the viewpoint of making it easy to adjust the light transmittance of the projection screen 11, the light transmittance of the image display unit 10, the total light transmittance of the image display unit 10, etc., to a predetermined range, and from the viewpoint of reducing the unevenness of the light transmitted through the image display unit 10 when the image projection unit 20 is lit, thereby improving the design.

[0025] The method for measuring the total light transmittance and haze of the cloth and projection screen 11 is as follows: The measurements can be taken using a haze meter ("NDH-2000" manufactured by Nippon Denshoku Co., Ltd., or an equivalent product) in accordance with JIS K7105.

[0026] The thickness of the projection screen 11 is preferably 100 μm or more and 2000 μm or less, more preferably 200 μm or more and 1500 μm or less, still more preferably 200 μm or more and 1000 μm or less, from the viewpoints such as being easy to adjust the light transmittance as the projection screen 11, the light transmittance of the image display unit 10, the total light transmittance of the image display unit 10, etc. within a predetermined range.

[0027] The projection screen 11 preferably has a metal layer, and more preferably is a cloth having a metal layer. Thereby, while improving the light transmittance and concealment, it becomes easier to display information better. In this case, the above-mentioned cloth can be used. The metal layer is a layer containing a metal, a metalloid, an alloy, or a metal compound, a metalloid compound as a material (metal element / metalloid element material) containing a metal element and / or a metalloid element. That is, in this specification, the "metal" in the metal layer includes not only "metal" but also "metalloid".

[0028] The projection screen 11 can color its surface by having a metal layer. The metal element / metalloid element material is not particularly limited as long as it can be colored, preferably as long as it can be colored by optical interference. The metal layer may contain components other than the metal element / metalloid element material. In that case, the content of the metal element / metalloid element material in the metal layer is, for example, 70% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, even more preferably 99% by mass or more, with respect to 100% by mass of the metal layer, and usually less than 100% by mass.

[0029] The content ratio of the metal element / semimetal element material can be measured and calculated as follows. Analyze using a scanning fluorescence X-ray analyzer (for example, Rigaku's scanning fluorescence X-ray analyzer ZSX Primus III+ or equivalent), with an acceleration voltage of 50 kV, an acceleration current of 50 mA, and an integration time of 60 seconds. Measure the X-ray intensity of the Kα line of the metal component to be measured, and in addition to the peak position, also measure the intensity at the background position so that the net intensity can be calculated. The measured intensity value can be converted to a content ratio from a calibration curve prepared in advance. Analyze the same sample five times, and use the average value as the average content ratio.

[0030] Examples of the metal element include a silver element, an aluminum element, a titanium element, a chromium element, a copper element, etc. Among these, from the viewpoint of color tone adjustment, etc., preferably a silver element, an aluminum element, a titanium element, etc. are mentioned, and particularly preferably an aluminum element is mentioned. The metal element may be a single type or a combination of two or more types.

[0031] Examples of the semimetal element include a silicon element, a germanium element, an antimony element, a tellurium element, a boron element, a phosphorus element, a bismuth element, a selenium element, etc. Among these, from the viewpoint of color tone adjustment, etc., preferably a silicon element, a germanium element, an antimony element, a tellurium element, a boron element, a phosphorus element, a bismuth element, and a selenium element, etc. are mentioned, and particularly preferably a silicon element is mentioned. The semimetal element may be a single type or a combination of two or more types.

[0032] Examples of the metal contained in the metal element / semimetal element material include silver, aluminum, titanium, etc. Among these, from the viewpoints of durability, design, etc., preferably silver, aluminum, titanium, etc. are mentioned, and particularly preferably aluminum is mentioned. The metal may be a single type or a combination of two or more types.

[0033] Examples of metalloids included in metallic / metalloid material include silicon, germanium, antimony, tellurium, boron, phosphorus, bismuth, and selenium. Among these, silicon, germanium, antimony, tellurium, boron, phosphorus, bismuth, and selenium are preferred from the viewpoint of durability and design, with silicon being particularly preferred. The metalloid may be a single type or a combination of two or more types.

[0034] The metal compound is not particularly limited, but examples include oxides, nitrides, and sulfides. Among these, oxides are preferred. The metal element / metalloid element material used in the metal layer is preferably a metal or a metalloid, and it is also preferable to use them in combination.

[0035] The average thickness of the metal layer is preferably 10 nm to 500 nm, more preferably 10 nm to 200 nm, and even more preferably 10 nm to 100 nm, from the viewpoint of ease of adjusting the light transmittance of the projection screen 11, the total light transmittance of the image display unit 10, etc., to a predetermined range, as well as from the viewpoint of design.

[0036] The method for measuring the average thickness of the metal layer is as follows. Specifically, the analysis is performed using a scanning X-ray fluorescence analyzer (for example, a Rigaku ZSX Primus III+ or equivalent) with an acceleration voltage of 50 kV, an acceleration current of 50 mA, and an integration time of 60 seconds. The X-ray intensity of the Kα rays of the metal component to be measured is measured, and the intensity at the background position is also measured in addition to the peak position so that the net intensity can be calculated. The measured intensity values ​​can be converted to thickness from a calibration curve that has been prepared in advance. The same sample is analyzed five times, and the average value is taken as the thickness.

[0037] The metal layer is preferably placed on at least one side of the substrate, such as cloth, more preferably on the side of the substrate opposite to the light-transmitting cushioning material (i.e., the front side), and even more preferably on the side of the substrate opposite to the light-transmitting cushioning material. Placing the metal layer on the side opposite to the light-transmitting cushioning material makes it easier to display information more appropriately using light from the rear image projection device.

[0038] When the metal layer is incorporated into the fabric, it is preferable that it be attached to the surface of the fabric. In other words, it is preferable that no other areas or components are interposed between the metal layer and the surface of the fabric. In this case, from the viewpoint of making it easier to adjust the light transmittance of the projection screen 11, the total light transmittance of the image display unit 10, etc., to a predetermined range, and from the viewpoint of colorability, the metal layer is preferably 1 μg / cm³ relative to the fabric. ２ 100 μg / cm or more ２ More preferably 2 μg / cm³ ２ 60 μg / cm or more ２ More preferably, 2 μg / cm³ ２ 40 μg / cm or more ２ The following is particularly preferable: 2 μg / cm³ ２ 20 μg / cm or more ２ It is preferable that the adhesion amount is as follows.

[0039] When using aluminum and silicon as the metal layer, the metal layer is preferably 2 μg / cm³. ２ 40 μg / cm or more ２ More preferably 2 μg / cm³ ２ 20 μg / cm or more ２ The following adhesion amounts are preferable. When titanium is included as the metal layer, the colored portion is preferably 2 μg / cm³. ２ 100 μg / cm or more ２ More preferably 2 μg / cm³ ２ More than 70μg / cm ２ More preferably, 2 μg / cm³ ２ 40 μg / cm or more ２ It is preferable that the adhesion amount is as follows.

[0040] The method for measuring the amount of metal layer adhesion is as follows: Specifically, a 100 cm x 100 cm section of the sample before the metal layer is formed is cut, and its weight is measured to determine the basis weight. A 100 cm x 100 cm section of the sample after the metal layer has been formed is cut, and the difference between this weight and the basis weight of the base material is calculated to determine the amount of adhesion (μg / cm²). ２ )

[0041] The layer structure of the metal layer is not particularly limited. The metal layer may be a single layer or multiple layers having the same or different compositions. Furthermore, one or both of the two main surfaces of the metal layer may be coated with a film such as an oxide film. The metal layer may, for example, consist of a metal portion containing metal and a metalloid portion containing metalloids. This makes it possible to color the layer through optical interference caused by the lamination of the metal portion and the metalloid portion. In this case, for example, the metal portion and metalloid portion may be arranged in order from the substrate side.

[0042] Furthermore, if the base material is cloth, it is preferable to form a metal layer by attaching metal to the surface of the base material. However, if the cloth constituting the projection screen 11 is napped, it is preferable for the metal to adhere to the surface layer of the napped portion to form a metal layer.

[0043] Furthermore, the metal layer does not need to be formed directly on the surface of the substrate; a separate resin sheet may be provided, and the metal layer may be formed on one surface of the resin sheet. In this case, the side of the resin sheet on which the metal layer is formed may be bonded to a substrate such as artificial leather or cloth, so that the cloth or other substrate has a projection screen with a metal layer. In this case, the bonding of the metal layer and the substrate may be done, for example, via an adhesive layer. The adhesive layer may be formed using a known adhesive or tack.

[0044] The resin sheet may contain components other than resin, as long as the effects of the present invention are not significantly impaired. In that case, the total amount of resin in the resin sheet is, for example, 80% by mass or more, preferably 90% by mass or more, more preferably 95% by mass or more, and even more preferably 99% by mass or more, and is usually less than 100% by mass.

[0045] The resin is not particularly limited and examples include polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate, and modified polyester; polyolefin resins such as polyethylene (PE), polypropylene (PP), polystyrene, and cyclic olefin resins; vinyl resins such as polyvinyl chloride and polyvinylidene chloride; polyvinyl acetal resins such as polyvinyl butyral (PVB); polyetheretherketone (PEEK) resin; polysulfone (PSF) resin; polyethersulfone (PES) resin; polycarbonate (PC) resin; polyamide resin; polyimide resin; acrylic resin; polyurethane resin; and triacetylcellulose (TAC) resin.

[0046] From an aesthetic standpoint, the resin sheet is preferably designed to mimic the surface texture of fabric, leather, etc. Specifically, for example, the resin sheet may have a surface texture that is the same as or similar to the surface texture of fabric, leather, etc. The thickness of the resin sheet is preferably 1 μm to 500 μm, more preferably 1 μm to 100 μm, and even more preferably 5 μm to 50 μm.

[0047] The method for forming a metal layer on a substrate such as cloth or a resin sheet is not particularly limited, but for example, the metal layer can be formed by sputtering, vacuum deposition, ion plating, chemical deposition, or pulsed laser deposition. Among these, sputtering is preferred from the viewpoint of film thickness controllability. The sputtering method is not particularly limited, but examples include DC magnetron sputtering, high-frequency magnetron sputtering, and ion beam sputtering. The sputtering apparatus may be a batch type or a roll-to-roll type.

[0048] (Light-transmitting cushioning material) The light-transmitting cushioning material 12 transmits light projected by the image projection unit 20 and provides a flexible tactile feel to the rear-projection image display device 1. Examples of the light-transmitting cushioning material 12 include polymer foam and polymer elastic material. Among these, polymer elastic material is preferred from the viewpoint that information can be clearly displayed even when a rear projection device is used. The polymer elastic material is preferably made of rubber. Examples of rubber that make up the polymer elastic material include silicone rubber, acrylic rubber, urethane rubber, and fluororubber. These rubbers may be used individually or in combination of two or more types.

[0049] Among the materials described above, silicone rubber is preferred as the rubber for the polymeric elastic body. Using silicone rubber for the polymeric elastic body improves the tactile feel and light transmittance of the image display unit 10. Furthermore, since silicone rubber has high thermal conductivity, it can more efficiently dissipate the heat generated by the image projection unit 20, preventing it from being heated by light from the image projection unit 20 and improving the tactile feel. From the viewpoint of tactile feel and light transmittance, silicone gel is preferred among silicone rubbers, and it is preferable that the rubber constituting the elastic polymer body includes silicone gel. The silicone gel is not particularly limited, but it is preferable that it be a gel-like material obtained by controlling the crosslinking density of addition-type liquid silicone rubber to 1 / 5 to 1 / 10 of the normal level and curing it. An example of a suitable silicone gel for the elastic polymer body is "Pantel GEL" manufactured by Sekisui Polymatec Co., Ltd.

[0050] (Addition-type liquid silicone rubber) Addition-type liquid silicone rubber contains a vinyl group-containing organopolysiloxane as the main component, a hydrogen organopolysiloxane as the crosslinking agent, and a platinum compound as the catalyst.

[0051] Examples of vinyl group-containing organopolysiloxanes include dimethylpolysiloxane with dimethylvinylsiloxy groups sealed at both ends, dimethylsiloxane / methylvinylsiloxane copolymer with dimethylvinylsiloxy groups sealed at both ends, dimethylsiloxane / diphenylsiloxane copolymer with dimethylvinylsiloxy groups sealed at both ends, methyltrifluoropropylpolysiloxane with dimethylvinylsiloxy groups sealed at both ends, and dimethylvinylsiloxy groups sealed at both ends. Chain dimethylsiloxane / methyltrifluoropropylsiloxane copolymer, terminally dimethylvinylsiloxy group-sealed dimethylsiloxane / methyltrifluoropropylsiloxane / methylvinylsiloxane copolymer, terminally trimethylsiloxy group-sealed dimethylsiloxane / vinylmethylsiloxane copolymer, terminally trimethylsiloxy group-sealed dimethylsiloxane / vinylmethylsiloxane / diphenylsiloxane copolymer, terminally trimethylsiloxy group-sealed vinylmethylsiloxane / methyltrifluoropropylsiloxane copolymer, terminally trimethylsiloxy Roxy group / dimethylvinylsiloxy group-sealed dimethylpolysiloxane, terminal trimethylsiloxy group / dimethylvinylsiloxy group-sealed dimethylsiloxane / methylvinylsiloxane copolymer, terminal trimethylsiloxy group / dimethylvinylsiloxy group-sealed dimethylsiloxane / diphenylsiloxane copolymer, terminal trimethylsiloxy group / dimethylvinylsiloxy group-sealed dimethylsiloxane / diphenylsiloxane / methylvinylsiloxane copolymer, terminal trimethylsiloxy group / dimethylvinylsiloxy group-sealed methyltrifluoropropylpolysiloxane , terminal trimethylsiloxy group / dimethylvinylsiloxy group sealed dimethylsiloxane / methyltrifluoropropylsiloxane copolymer, terminal trimethylsiloxy group / dimethylvinylsiloxy group sealed dimethylsiloxane / methyltrifluoropropylsiloxane / methylvinylsiloxane copolymer, both terminal methyldivinylsiloxy group sealed dimethylpolysiloxane, both terminal methyldivinylsiloxy group sealed dimethylsiloxane / methylvinylsiloxane copolymer, both terminal methyldivinylsiloxy group sealed dimethylsiloxane / diphenylsiloxane copolymer,Dimethylsiloxane / methylvinylsiloxane / diphenylsiloxane copolymer with methyldivinylsiloxy groups sealed at both ends, methyltrifluoropropylpolysiloxane with methyldivinylsiloxy groups sealed at both ends, dimethylsiloxane / methyltrifluoropropylsiloxane copolymer with methyldivinylsiloxy groups sealed at both ends, dimethylsiloxane / methyltrifluoropropylsiloxane / methylvinylsiloxane copolymer with methyldivinylsiloxy groups sealed at both ends, dimethylpolysiloxane with trivinylsiloxy groups sealed at both ends, dimethylsiloxane / methylvinylsiloxane copolymer with trivinylsiloxy groups sealed at both ends, dimethylsiloxane / diphenylsiloxane with trivinylsiloxy groups sealed at both ends Linear diorganopolysiloxanes such as 3 copolymers, dimethylsiloxane / methylvinylsiloxane / diphenylsiloxane copolymers with trivinylsiloxy groups sealed at both ends, methyltrifluoropropylpolysiloxane, dimethylsiloxane / methyltrifluoropropylsiloxane copolymers with trivinylsiloxy groups sealed at both ends, and dimethylsiloxane / methyltrifluoropropylsiloxane / methylvinylsiloxane copolymers with trivinylsiloxy groups sealed at both ends, and each of the linear diorganopolysiloxanes exemplified above, each containing a small amount of organosylsesquioxane units (e.g., methylsilsesquioxane units; (CH3)SiO) in the main chain. 3 / 2 Examples include branched-chain organopolysiloxanes containing ).

[0052] The viscosity of the vinyl group-containing organopolysiloxane is not particularly limited, but from the viewpoint of good handling properties of the silicone rubber composition obtained by mixing it with the raw materials for the silicone gel, as well as the strength and fluidity of the resulting silicone gel, it is preferable that the viscosity at 23°C be 50 to 100,000 mPa·s, and more preferably 100 to 10,000 mPa·s. The viscosity can be measured using a rotational viscometer.

[0053] Hydrogen organopolysiloxanes include, for example, 1,1,3,3-tetramethyldisiloxane, 1,1,3,3,5,5-hexamethyltrisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, methylhydrogensiloxane cyclic polymers, methylhydrogensiloxane / dimethylsiloxane cyclic copolymers, tris(dimethylhydrogensiloxy)silylmethylsilane, tris(dimethylhydrogensiloxy)silylphenylsilane, dimethylpolysiloxane with dimethylhydrogensiloxy groups sealed at both ends, methylhydrogenpolysiloxane with dimethylhydrogensiloxy groups sealed at both ends. Examples include sun-dimethylsiloxane copolymer, methylhydrogensiloxane / diphenylsiloxane copolymer with dimethylhydrogensiloxy group-sealed at both ends, methylhydrogensiloxane / dimethylsiloxane / diphenylsiloxane copolymer with dimethylhydrogensiloxy group-sealed at both ends, methylhydrogenpolysiloxane with trimethylsiloxy group-sealed at both ends, methylhydrogensiloxane / methylhydrogensiloxane copolymer with trimethylsiloxy group-sealed at both ends, methylhydrogensiloxane / diphenylsiloxane copolymer with trimethylsiloxy group-sealed at both ends, and methylhydrogensiloxane / diphenylsiloxane / dimethylsiloxane copolymer with trimethylsiloxy group-sealed at both ends.

[0054] The viscosity of the hydrogen organopolysiloxane is preferably 0.1 to 1,000 mPa·s, and more preferably 1 to 500 mPa·s. If the viscosity of the hydrogen organopolysiloxane is too low, the viscosity of the resulting silicone rubber composition will also be low, resulting in poor workability and potentially causing the resulting silicone gel to become too hard. If the viscosity of the hydrogen organopolysiloxane is too high, the resulting silicone rubber composition will also have high viscosity, which may negatively affect workability.

[0055] The amount of hydrogen organopolysiloxane blended is such that there are 0.01 to 3 hydrogen atoms (SiH groups) bonded to silicon atoms in the hydrogen organopolysiloxane for each vinyl group bonded to silicon atoms in the entire composition (particularly the vinyl group-containing organopolysiloxane). Preferably, there are 0.05 to 2 hydrogen atoms (SiH groups) bonded to silicon atoms in the hydrogen organopolysiloxane, more preferably 0.2 to 1.5 hydrogen atoms (SiH groups) bonded to silicon atoms in the hydrogen organopolysiloxane are less than 0.01 per vinyl group in the entire silicone rubber composition, and a silicone gel cannot be obtained. If there are more than 3 hydrogen atoms, the heat resistance of the silicone gel decreases.

[0056] Examples of platinum compounds include platinum black, chloroplatinic acid, alcohol-modified products such as chloroplatinic acid, and complexes of chloroplatinic acid with olefins, aldehydes, vinylsiloxanes, or acetylene alcohols.

[0057] The amount of platinum compound can be an effective amount and can be increased or decreased as appropriate depending on the desired curing rate, but it is usually in the range of 0.1 to 10,000 ppm by mass, preferably 1 to 5,000 ppm by mass, relative to the total amount of vinyl group-containing organopolysiloxane and hydrogen organopolysiloxane. If this amount is too high, the heat resistance of the resulting silicone gel may decrease.

[0058] Furthermore, the addition-type liquid silicone rubber may further contain reaction inhibitors to adjust the pot life. Examples of reaction inhibitors include methyl vinylcyclotetrasiloxane, acetylene alcohols, siloxane-modified acetylene alcohol, and hydroperoxide.

[0059] Furthermore, to increase strength, the addition-type liquid silicone rubber may contain additional reinforcing materials. Examples of reinforcing materials include reinforcing silica, quartz powder, iron oxide, alumina, and vinyl group-containing silicone resin.

[0060] Addition-type liquid silicone rubber may further contain additives such as pigments, mold release agents, heat-resistant agents, flame retardants, flow modifiers, settling inhibitors, and adhesion enhancers.

[0061] Elastic polymers are not particularly limited, but they can be produced by curing a rubber composition containing rubber components. The curing time of the rubber composition can be adjusted, for example, by the amount of catalyst added or the curing temperature. More specifically, elastic polymers can be produced by, for example, supplying each raw material of a rubber composition to a mixer such as a kneading device, mixing them in the mixer to obtain a sheet-like rubber composition, and then curing the obtained rubber composition. When curing the rubber composition, it may be cured at room temperature, but if the rubber composition needs to be cured in a short time, it is preferable to heat the rubber composition.

[0062] The thickness of the light-transmitting cushioning material 12 is not particularly limited, but is preferably 0.5 to 100 mm, and more preferably 1 to 50 mm. When the thickness is within this range, the rear projection image display device 1 can be suitably used as an interior material for vehicles.

[0063] The light-transmitting cushioning material 12 has light transmittance in the thickness direction. The total light transmittance of the light-transmitting cushioning material 12 in the thickness direction should be, for example, 50% or more, preferably 70% or more, more preferably 80% or more, and even more preferably 85% or more. By having a total light transmittance of 50% or more of the light-transmitting cushioning material 12, the image display unit 10 can be given sufficient light transmittance, and the light emitted from the image projection unit 20 can be easily emitted to the projection screen side with a certain amount or more of light. The higher the total light transmittance of the light-transmitting cushioning material 12, the better, but it should be 100% or less, and practically it may be 99% or less or 98% or less. The total light transmittance of the light-transmitting cushioning material 12 can be kept within the above range by appropriately adjusting, for example, the thickness of the light-transmitting cushioning material 12, the type of rubber constituting the light-transmitting cushioning material 12, and the type of additives such as pigments and dyes added to the rubber, but it is easier to increase the total light transmittance by using silicone rubber. The total light transmittance of the light-transmitting cushioning material 12 can be measured using a haze meter, for example, in accordance with ASTM D1003.

[0064] The durometer hardness of the light-transmitting cushioning material 12 is measured using different methods depending on the hardness. Generally, it is measured under conditions where the durometer hardness falls within the range of 20 to 90. When measured using a Type A durometer in accordance with JIS K6253-3:2012, it is preferably between 20 and 80. When the durometer hardness of the light-transmitting cushioning material 12 measured using a Type A durometer is between 20 and 80, it becomes possible to further achieve both strength and a flexible feel for the light-transmitting cushioning material 12. From this viewpoint, the durometer hardness of the light-transmitting cushioning material 12 measured using a Type A durometer is more preferably between 20 and 70, and even more preferably between 20 and 65. Furthermore, for a more flexible light-transmitting cushioning material, when measured using a Type E durometer in accordance with JIS K6253-3:2012, it is preferably between 20 and 90. If the durometer hardness of the light-transmitting cushioning material 12, measured using a Type E durometer, is between 20 and 90, it becomes possible to further achieve both strength and a flexible feel in the light-transmitting cushioning material 12. From this viewpoint, the durometer hardness of the light-transmitting cushioning material 12, measured using a Type E durometer, is more preferably between 30 and 90, and even more preferably between 40 and 90. The durometer hardness of the light-transmitting cushioning material 12 can be measured in accordance with JIS K6253-3:2012, for example, with an Asker rubber altimeter manufactured by Polymer Instruments Co., Ltd.

[0065] (Light-Transmitting Operation Detection Device) The image display unit 10 preferably further comprises a light-transmitting operation detection device (not shown). By providing a light-transmitting operation detection device, the image display unit 10 can be used as a control system device for a specific function. Examples of light-transmitting operation detection devices include touch panels and gesture sensors utilizing transparent antennas. These sensors may be used individually or in combination. The installation location of the sensor is not particularly limited. For example, a flexible touch sensor can be placed between the projection screen and the light-transmitting cushioning material because it does not interfere with the tactile feel of the light-transmitting cushioning material. On the other hand, sensors using highly rigid substrates such as PET film or glass may interfere with the tactile feel of the light-transmitting cushioning material, so it is preferable to place them between the light-transmitting cushioning material and the transparent housing, or on the side of the transparent housing opposite to the side where the light-transmitting cushioning material is placed. The light-transmitting operation detection device should preferably have a total light transmittance of 50% or more so as not to interfere with image projection. To display images more brightly, the total light transmittance is preferably 70% or more, and more preferably 80% or more.

[0066] (Transparent Housing) The transparent housing 13 transmits light projected by the image projection unit 20 and also forms the framework of the image display unit 10. Examples of transparent housings include glass housings and resin housings, but a resin housing is preferred. The resin constituting the resin housing is not particularly limited as long as it is transparent, but a thermoplastic resin is preferred. Examples of resins constituting the resin housing include acrylonitrile-styrene-butadiene copolymer (ABS resin), polycarbonate (PC) resin, and acrylic resin. The resin constituting the resin housing is a light-transmitting resin. This allows the resin housing to transmit light projected by the image projection unit 20.

[0067] [Image projection unit] The image projection unit 20 includes a rear image projection device 21.

[0068] (Rear Image Projection Device) In this embodiment, the rear image projection device 21 is a device that illuminates an image forming element with a light beam emitted from a light source and projects the image formed by the image forming element using a projection lens. The image forming element has a light bulb such as a digital micromirror device (DMD), a transmissive liquid crystal panel, or a reflective liquid crystal panel. Examples of light sources include lamps, LED light sources, and laser light sources. From the viewpoint of light source lifespan and miniaturization, a laser projector using a laser light source as the light source is preferred for the rear image projection device 21. A laser projector is capable of rear projection and can display a clear image.

[0069] The image projection unit 20 may further include devices other than the rear image projection device 21. For example, the image projection unit 20 may include a storage device, a processing device, a communication device, an operating device, etc. The storage device stores various types of information. The storage device is configured to include, for example, volatile memory such as RAM and non-volatile memory such as ROM. The processing device controls the operation of the image projection unit 20. The processing device is configured to include a CPU. The communication device is hardware that acts as a transmitting and receiving device for communicating with other devices. The operating device is an input interface that accepts user input operations. The operating device has, for example, operation buttons provided on the image projection unit 20. The operating device may have a touch panel instead of operation buttons.

[0070] <Rear-projection image display device of the second embodiment> Hereinafter, the rear-projection image display device 1A of the second embodiment of the present invention will be described with reference to Figure 2. Note that the same parts as those of the rear-projection image display device of the first embodiment of the present invention will be omitted from the description, and the parts that differ from the rear-projection image display device of the first embodiment of the invention will be mainly described.

[0071] As shown in Figure 2, the rear projection image display device 1A of the second embodiment of the present invention comprises an image display unit 10A including a projection screen 11, a light-transmitting cushioning material 12, a touch panel 14, and a transparent housing 13, and an image projection unit 20 including a rear image projection device 21. The rear projection image display device 1A of the second embodiment of the present invention has the above configuration to display information well using light, and also has excellent concealment of the area where information using light is displayed when information using light is not displayed. Furthermore, because the rear projection image display device 1A of the second embodiment of the present invention is equipped with a touch panel 14, the rear projection image display device 1A can be operated by touching the projection screen 11.

[0072] The touch panel 14 is an input device that detects the operating position of an operating object, such as a finger, approaching or contacting the touch area and outputs the result to the processing unit. Furthermore, the touch panel 14 is preferably a transparent (light-transmitting) touch panel. For example, the touch panel 14 has sensor electrodes made of conductive materials such as ITO (indium tin oxide), graphene, or silver nanowires on a transparent glass substrate, and detects input operations by detecting changes in capacitance between the sensor electrodes.

[0073] The touch panel 14 is preferably positioned between the light-transmitting cushioning material 12 and the transparent housing 13. This allows for detection of user input without interfering with the flexible tactile feel provided by the light-transmitting cushioning material 12.

[0074] <Rear-projection image display device of the third embodiment> Hereinafter, the rear-projection image display device 1B of the third embodiment of the present invention will be described with reference to Figure 3. Note that the same parts as those of the rear-projection image display device of the first embodiment of the present invention will be omitted from the description, and the parts that differ from the rear-projection image display device of the first embodiment of the invention will be mainly described.

[0075] As shown in Figure 3, the rear projection image display device 1B of the third embodiment of the present invention comprises an image display unit 10B having a curved structure and including a projection screen 11, a light-transmitting cushioning material 12, and a transparent housing 13, and an image projection unit 20 including a rear image projection device 21. The rear projection image display device 1B of the third embodiment of the present invention, having the above configuration, can display information well using light, and has excellent concealment of the area that displays information using light when information using light is not displayed. Furthermore, the curved structure of the image display unit 10B further enhances the design aesthetics of the rear projection image display device.

[0076] The curved structure of the image display unit 10B can be formed by making the transparent housing 13 curved. For example, the transparent housing 13 can be made curved by molding transparent resin. Examples of molding methods for transparent resin include stamping molding, vacuum forming, compression molding, and injection molding. Among these, stamping molding and vacuum forming are preferred. As for vacuum forming, either male-pull vacuum forming or female-pull vacuum forming can be used, but male-pull vacuum forming is more preferred.

[0077] The image display unit 10B of the rear-projection image display device 1B in the third embodiment of the present invention may further include a touch panel, as in the image display unit 10A of the rear-projection image display device 1A in the second embodiment of the present invention.

[0078] The curved structure of the image display unit 10B of the rear projection image display device 1B in the third embodiment of the present invention is not limited to the curved structure shown in Figure 3, as long as it is a curved structure. Even a curved structure other than the curved structure shown in Figure 3 can further enhance the design of the rear projection image display device. For example, although the image display unit 10B shown in Figure 3 is curved as a whole, it may be partially flat and partially curved, or it may have two curved parts with different curvatures. This makes it possible to mold it into various shapes to match the shape of the interior.

[0079] Furthermore, in each of the above embodiments, adhesive layers may be present between the projection screen 11 and the light-transmitting cushioning material 12, between the light-transmitting cushioning material 12 and the transparent housing 13, between the light-transmitting cushioning material 12 and the touch panel 14, and between the touch panel 14 and the transparent housing 13. The adhesive layer is preferably a resin layer, and known optically transparent resins (OCR), optically transparent adhesives (OCA), etc., may be used.

[0080] The method for manufacturing the image display unit of the present invention is as follows, for example. First, a transparent housing is prepared, and the image display unit 10 according to the first embodiment can be manufactured by laminating a sheet-shaped cushioning material and a transparent screen onto the transparent housing using a known method. Alternatively, the image display unit 10A can be manufactured by laminating, for example, a touch panel, a sheet-shaped cushioning material, and a transparent screen onto the transparent housing. Furthermore, if an adhesive layer is used, the adhesive layer should be appropriately placed between each component before laminating the components. If the transparent housing has a curved structure, the touch panel and the sheet-shaped cushioning material should be processed into a curved shape by vacuum forming or casting before being laminated onto the transparent housing. Also, the transparent screen, touch panel, etc., should be curved to match the shape of the transparent housing before being laminated onto the transparent housing.

[0081] <Fourth Embodiment of Rear Projection Image Display Device> Hereinafter, the fourth embodiment of the rear projection image display device 1C of the present invention will be described with reference to Figure 4. Note that the same parts as those of the first embodiment of the present invention will be omitted from the description, and the parts that differ from the first embodiment of the present invention will be mainly described.

[0082] In the first embodiment of the present invention, the rear-projection type image display device 1, the rear-projection device 21 was a device that illuminated an image-forming element with a light beam emitted from a light source and projected the image formed by the image-forming element using a projection lens. However, in the fourth embodiment of the present invention, the rear-projection type image display device 1C may be a device that projects an image onto a projection screen 11 by displaying an image. Examples of such a rear-projection device 21C include displays such as liquid crystal displays, organic EL displays, and micro-LED displays.

[0083] In the rear-projection image display device 1C of the fourth embodiment of the present invention, the rear image projection device 21C may be provided in contact with the image display unit 10, as shown in Figure 4, or it may be provided away from the image display unit 10. Furthermore, the rear-projection image display device of the fourth embodiment of the present invention may be equipped with a touch panel provided on the image display unit, as in the rear-projection image display device 1A of the second embodiment of the present invention, or it may be equipped with a touch panel by providing a rear image projection device equipped with a touch panel.

[0084] The image projection unit 20C includes a rear image projection device (display) 21C. Similar to the image projection unit 20, the image projection unit 20C may further include devices other than the rear image projection device (display) 21C. For example, similar to the image projection unit 20, the image projection unit 20C may include a storage device, a processing device, a communication device, an operating device, and the like.

[0085] <Applications> The rear projection image display devices 1, 1A to 1C of the first to fourth embodiments of the present invention are preferably used in vehicle interior materials. The rear projection image display devices 1, 1A to 1C are particularly suitable for use in vehicle interior materials in the automotive field, and are preferably used to constitute ceiling materials, doors, instrument panels, etc. In the rear projection image display devices 1, 1A to 1C, the projection screen 11 is preferably arranged on the interior side, and the image projection units 20, 20C are preferably arranged on the opposite side from the interior side. The interior side is the side that is decorated by the vehicle interior material, and is the outer peripheral surface side of the mounting body to which the vehicle interior material is attached.

[0086] The rear-projection image display devices 1, 1A to 1C of the first to fourth embodiments of the present invention are examples of the rear-projection image display devices of the present invention, and the rear-projection image display devices 1, 1A to 1C of the first to fourth embodiments of the present invention do not limit the rear-projection image display devices of the present invention.

[0087] 1, 1A-1C Rear projection image display device 10, 10A, 10B Image display unit 11 Projection screen 12 Light-transmitting cushioning material 13 Transparent housing 14 Touch panel 20, 20C Image projection unit 21, 21C Rear image projection device

Claims

1. A rear projection image display device comprising an image display unit including a projection screen, a light-transmitting cushioning material, and a transparent housing, and an image projection unit including a rear image projection device.

2. The rear-projection image display device according to claim 1, wherein the light-transmitting cushioning material is a polymeric elastic material, and the durometer hardness of the light-transmitting cushioning material is 20 to 80 when measured with a Type A durometer compliant with JIS K6253-3, or 20 to 90 when measured with a Type E durometer compliant with JIS K6253-3.

3. The rear projection image display device according to claim 1 or 2, wherein the image display unit further comprises an operation detection device having light transmittance.

4. The rear projection image display device according to claim 1 or 2, wherein the projection screen is at least one type of fabric selected from the group consisting of woven fabrics, knitted fabrics and nonwoven fabrics.

5. The rear projection image display device according to claim 1 or 2, wherein the projection screen is a cloth having a metal layer.

6. The metal layer is present in a concentration of 1 μg / cm³ relative to the fabric. ２ 100 μg / cm or more ２ The rear projection image display device according to claim 5, wherein the following amounts of material are attached.

7. The rear projection image display device according to claim 1 or 2, wherein the rear image projection device is a laser projector.

8. The rear projection image display device according to claim 1 or 2, wherein the light-transmitting cushioning material is silicone rubber.

9. The rear projection image display device according to claim 1 or 2, wherein the total light transmittance of the projection screen is 25% or less.

10. The rear projection image display device according to claim 1 or 2, wherein the image display unit has a curved structure.

Images