JP2004061521A - Reflection type screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflection type screen which has a superior contrast of projection in a light environment. <P>SOLUTION: On the same surface of a light-reflective substrate 1, a light scattering layer 2 and a light blocking layer 3 in the mixed pattern of a light transmission part 31 and a light blocking part 32 are formed. Preferably, the area of the light transmission part 31 of the light blocking layer 3 is 5 to 80 % of the area of the light blocking layer 3. Or the light scattering layer 2 and light blocking layer 3 are formed preferably in this order from the side of the light-reflective substrate 1. Or the light scattering layer 2 is preferably formed of at least spherical particulates and a transparent binder. <P>COPYRIGHT: (C)2004,JPO

Description

【００４９】
表１の結果から明らかなように、実施例１〜５のものは、明るい環境下においてもコントラストが高く視認性のよい映像を表示することができた。特に、実施例１、２のものは、光散乱層の後方散乱光がほとんどないものであり、また、遮光層の光透過部の面積が３０％であり、かつ光反射性基材側から光散乱層および遮光層がこの順に形成されていることから、非常にコントラストに優れるものであった。
【００５０】
比較例１、２のものは、遮光層を有さないものである。したがって、明色表示部分の明るさは遮光されない分明るくなるが、明るい環境下ではコントラストが低下し映像が見づらいものとなった。
【００５１】
【発明の効果】
以上のように、本発明の反射型スクリーンは、光反射性基材の同一面上に、光散乱層、および光透過部と遮光部の混在パターンからなる遮光層を有するものである。したがって、スクリーン周囲が明るい環境であってもコントラストの高い表示を得ることができ、明室用の反射型スクリーンとして使用できる。
【図面の簡単な説明】
【図１】本発明の反射型スクリーンの一実施例を示す断面図
【図２】本発明の反射型スクリーンの他の実施例を示す断面図
【図３】本発明の反射型スクリーンの他の実施例を示す断面図
【図４】本発明の反射型スクリーンの他の実施例を示す断面図
【符号の説明】
１・・・光反射性基材
２・・・光散乱層
３１・・・光透過部
３２・・・遮光部
３・・・遮光層
４・・・プラスチックフィルム
５・・・粘着層
６・・・反射型スクリーン[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reflective screen that projects an image projected from a projector such as an OHP, a slide, a projector, or the like as reflected light, and relates to a screen that is excellent in contrast when projected in a bright environment.
[0002]
[Prior art]
Conventionally, reflective screens need to diffuse image light rays so that images can be viewed in a wide range, and are mostly white. Reflective screens with these characteristics, when the surroundings are bright, ambient light is incident on the reflective screen and also diffuses this light, making the screen appear whitish regardless of the presence or absence of image light rays. Would. Due to this effect, in a projection in a bright environment, even a dark color display portion which originally has no image light beam becomes bright, which causes a decrease in contrast and makes it difficult to see an image.
[0003]
Therefore, in order to obtain a high-contrast and easy-to-view image, it is common to make the room dark and project around the reflective screen dark.
[0004]
[Problems to be solved by the invention]
However, with the spread of liquid crystal projectors and the use of reflective screens in conferences and other places, the need to brighten the room has increased due to the need to take notes and has little effect on the surrounding brightness. There is also an increasing demand for a reflective screen that can provide a high-contrast, easy-to-view display without being displayed.
[0005]
Therefore, an object of the present invention is to provide a reflective screen having excellent contrast in projection in a bright environment.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the reflection type screen of the present invention has a light scattering layer and a light shielding layer composed of a mixed pattern of a light transmitting part and a light shielding part on the same surface of the light reflective substrate. It is assumed that.
[0007]
Preferably, the area of the light transmitting portion of the light shielding layer is 5 to 80% of the area of the light shielding layer.
[0008]
Preferably, the light-scattering layer and the light-shielding layer are provided in this order from the light-reflective substrate side.
[0009]
Preferably, the light scattering layer comprises at least spherical fine particles and a transparent binder.
[0010]
Preferably, the spherical fine particles have an average particle diameter of 1.0 μm to 10.0 μm, and the relative refractive index n of the spherical fine particles with respect to the refractive index of the transparent binder is 0.91 <n <1.09 (where n (≠ 1.00).
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The reflection type screen of the present invention is characterized in that a light-scattering layer and a light-shielding layer composed of a mixed pattern of a light-transmitting portion and a light-shielding portion are provided on the same surface of the light-reflective substrate. Hereinafter, embodiments of each component will be described.
[0012]
1 to 4 show an embodiment of the reflective screen of the present invention. As shown, the reflective screen 6 of the present invention has a light scattering layer 2 and a light shielding layer 3 on the same surface of a light reflective substrate 1.
[0013]
As the light-reflective substrate, a plate-like, film-like, or sheet-like material having a surface reflectivity of 90% or more is used. As such a material, a metal, such as aluminum or silver, in a plate shape, a film shape, a sheet shape, or the like can be used, but a polymer resin in a plate shape, a film shape, a sheet shape, or the like can be used. It is preferable to use a glass plate on which metal is formed in a film shape by vapor deposition, sputtering, or the like, or a glass plate on which a paste-like metal is applied in a film shape. Further, it is also possible to use a polymer resin in which a white pigment is kneaded in a sheet shape or the like in order to suppress the generation of hot spots and enhance the diffusivity. As the polymer resin, a homopolymer or copolymer of a (meth) acrylate such as methyl methacrylate and methyl acrylate, polyester, polycarbonate, polyvinyl chloride, polystyrene and the like can be used.
[0014]
The light-scattering layer is composed of at least spherical fine particles and a transparent binder, and is for diffusing light reflected by the light-reflective substrate so that an image in the reflective screen can be visually recognized uniformly. Here, as the transparent binder, any material can be used as long as it is transparent and can uniformly disperse and hold spherical fine particles. Examples thereof include fluids such as liquids and liquid crystals, and solids such as glass and polymer resins. From the viewpoint of dispersion stability, a polymer resin is preferable.
[0015]
The glass used as the transparent binder is not particularly limited as long as the light transmittance of the light scattering layer is not lost, but is generally silicate glass, phosphate glass, borate glass, or the like. Oxide glass and the like.
[0016]
Examples of the polymer resin used as the transparent binder include polyester resins, acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, urethane resins, epoxy resins, and polycarbonate resins. Resin, cellulose resin, acetal resin, vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamide resin, polyimide resin, melamine resin, phenol resin, silicone resin, fluorine resin, etc. Thermoplastic resins, thermosetting resins, ionizing radiation-curable resins, and the like.
[0017]
As the spherical fine particles, inorganic fine particles such as silica, alumina, talc, zirconia, zinc oxide, and titanium dioxide, and organic fine particles such as polymethyl methacrylate, polystyrene, polyurethane, benzoguanamine, and silicone resin can be used. In particular, organic fine particles are preferable in that a spherical shape is easily obtained.
[0018]
The average particle diameter of the spherical fine particles is preferably 1.0 μm to 10.0 μm, and more preferably 2.0 μm to 6.0 μm. By setting the average particle size in such a range, light scattered backward in the light traveling direction in the light scattering layer can be reduced. As a result, the light from the environment incident on the screen in a bright environment is less scattered backward (to the projector side) with respect to the traveling direction of the light, and the darkness of the dark display portion where there is no image light beam is reduced. The display can be darkened and a high-contrast easy-to-view display can be performed.
[0019]
The particle size distribution of the spherical fine particles is not particularly limited as long as the average particle size falls within the above range, and may be monodisperse or polydisperse, but the sharpness of the image is improved. From the viewpoint of increasing the density, a monodispersed one is preferable.
[0020]
The relative refractive index of the spherical fine particles with respect to the refractive index of the transparent binder (a value obtained by dividing the refractive index of the spherical fine particles by the refractive index of the transparent binder, hereinafter simply referred to as “relative refractive index”) n is 0.91 <n. <1.09 (where n ≠ 1.00) is preferable. By setting the relative refractive index n in such a range, light scattered backward in the light traveling direction in the light scattering layer can be reduced. As a result, the light from the environment incident on the screen in a bright environment is less scattered backward (to the projector side) with respect to the traveling direction of the light, and the darkness of the dark display portion where there is no image light beam is reduced. The display can be darkened and a high-contrast easy-to-view display can be performed.
[0021]
Further, as the optical characteristics of the light scattering layer, it is desirable that the haze is 40.0% or more, preferably 60.0% or more, more preferably 80.0% or more. By setting the haze to 40.0% or more, the viewing angle of the image projected from the projector can be sufficiently widened. The haze can be set in the above range by appropriately adjusting the content of the spherical fine particles contained in the light scattering layer and the thickness of the light scattering layer.
[0022]
Here, the haze is a value of the haze in JIS-K7136, and is obtained from an equation of haze (%) = [(τ ₄ / τ ₂ ) −τ ₃ (τ ₂ / τ ₁ )] × 100. (Τ ₁ : light flux of incident light, τ ₂ : total light flux transmitted through the test piece, τ ₃ : light flux diffused by the device, τ ₄ : light flux diffused by the device and the test piece).
[0023]
The light-shielding layer has a role of improving the contrast of an image when the image is projected in a bright state. Here, from the viewpoint of further improving the contrast, the light-shielding portion of the light-shielding layer is preferably excellent in light absorption, and particularly preferably the light-shielding portion is black.
[0024]
The light-shielding layer 3 is composed of a mixed pattern of the light-transmitting part 31 and the light-shielding part 32 (FIG. 1). The mixed pattern of the light-shielding layers is not particularly limited, and may be an irregular pattern as well as a regular pattern such as a halftone dot, a stripe, or a concentric circle. Such a pattern, for example, by printing a pattern with light-shielding ink on the light-reflective substrate or light-scattering layer, the light-shielding portion provided on the entire surface of the light-reflective substrate or light-scattering layer It can be formed by removing a part chemically or physically or by making a hole in a member having a light-shielding property.
[0025]
The light shielding portion of the light shielding layer is mainly formed of a polymer resin and a coloring agent. Examples of the polymer resin include those similar to those exemplified for the light scattering layer. Examples of the coloring agent include black dyes and pigments such as carbon black, graphite and titanium black, and metal powders such as aluminum and silver. The light transmitting portion may be made of a polymer resin or the like, but may not exist at all such as in the case of a hole portion.
[0026]
It is desirable that the area of the light transmitting portion of the light shielding layer is 5 to 80%, preferably 20 to 40% of the area of the light shielding layer. When the content is 5% or more, the image can be brightened, and when the content is 80% or less, the contrast can be made sufficient.
[0027]
The light-shielding layer and the light-scattering layer are not particularly limited in their positional relationship as long as they are formed on the same surface of the light-reflective substrate, but from the viewpoint of making the contrast more satisfactory, Therefore, it is preferable that the light-scattering layer and the light-shielding layer are provided in this order.
[0028]
The light-scattering layer and the light-shielding layer described above are prepared by melting a polymer resin and adding spherical fine particles and a coloring agent to form a sheet, or coating the spherical fine particles and the coloring agent together with the polymer resin. It can be formed by coating on a light-reflective substrate, or on a light-scattering layer, a light-shielding layer, or a transparent substrate such as a plastic film, and drying to form a film.
[0029]
The reflection type screen of the present invention includes, for example, directly laminating a light scattering layer and a light shielding layer on a light reflecting substrate (FIGS. 1 and 2), or a light scattering layer and a light scattering layer on a light reflecting substrate. It can be obtained by laminating a light shielding layer via an adhesive layer or the like (FIGS. 3 and 4).
[0030]
The reflection type screen of the present invention may be provided with an antireflection layer on the uppermost layer. Thus, it is possible to prevent a decrease in the amount of light of the image projected from the projector and project a brighter image on the screen.
[0031]
Further, the reflective screen of the present invention may be provided with a hard coat layer as the uppermost layer. As a result, it is possible to prevent the display quality from deteriorating due to the scratch on the screen surface.
[0032]
【Example】
Hereinafter, examples of the present invention will be described. Unless otherwise specified, “parts” and “%” are based on weight.
[0033]
[Example 1]
An aluminum layer having a thickness of 100 nm was formed on a 188 μm-thick polyester film (Lumirror T60: Toray Industries, Inc.) by vapor deposition to obtain a light-reflective substrate. Then, a light-scattering layer having a dry coating thickness of 35 μm and an adhesive layer having a dry coating thickness of 10 μm were formed by sequentially applying and drying a light-scattering layer coating solution and an adhesive layer coating solution having the following compositions on the aluminum vapor-deposited surface. .
[0034]
<Light scattering layer coating liquid: relative refractive index n = 0.92>
・ 100 parts of polyester resin (Chemit 1249: Toray Industries, refractive index 1.56)
・ 5 parts of silicone resin particles (Tospearl 120: GE Toshiba Silicone Co., Ltd.
(Refractive index 1.44, average particle size 2.0 μm)
・ 75 parts of methyl ethyl ketone ・ 75 parts of toluene
<Coating solution for adhesive layer>
・ Acrylic adhesive (solid content 40%) 100 parts (Olivine BPS1109: Toyo Ink Manufacturing Co., Ltd.)
2.4 parts of isocyanate curing agent (solid content 38%) (Olivine BHS8515: Toyo Ink Manufacturing Co., Ltd.)
・ 100 parts of ethyl acetate
Next, on the adhesive layer, a member (AK Tint: Kimoto) having a black light-shielding layer having a light-transmitting portion having an area of 30% of the area of the entire light-shielding layer on a plastic film is laminated from the plastic film side. Thus, a reflective screen was obtained (FIG. 3).
[0037]
[Example 2]
A light-scattering layer having a dry coating thickness of 35 μm was formed by applying and drying a light-scattering layer coating solution having the following composition on the aluminum-deposited surface of the light-reflective substrate used in Example 1.
[0038]
<Light scattering layer coating liquid: relative refractive index n = 1.06>
・ 100 parts of urethane-based adhesive (Takerac A-971: Takeda Pharmaceutical Company Limited,
(Refractive index 1.50, solid content 50%)
-7.6 parts of isocyanate curing agent (Takenate A-3: Takeda Pharmaceutical Company, solid content 75%)
-10 parts of polystyrene resin particles (Techpolymer SBX-6: Sekisui Plastics Co., Ltd.
(Refractive index 1.59, average particle diameter 6.0 μm)
[0039]
Next, a member (AK Tint: Kimoto) having the same light-shielding layer as in Example 1 was laminated on the adhesive light-scattering layer from the plastic film side to obtain a reflective screen.
[0040]
[Example 3]
The member to be laminated on the adhesive layer of Example 1 is a member (AK Tint: Kimotosha) having a black light-shielding layer on a plastic film in which the area of the light transmitting portion is 50% of the total area of the light-shielding layer. A reflection type screen was obtained in the same manner as in Example 1 except for performing (FIG. 3).
[0041]
[Example 4]
A reflective screen was obtained in the same manner as in Example 1 except that the coating solution for the light-scattering layer in Example 1 was changed to one having the following composition (FIG. 3).
[0042]
<Light scattering layer coating liquid: relative refractive index n = 0.905>
・ 100 parts of polystyrene resin (Stylon 666R: Asahi Kasei Corporation, refractive index 1.59)
・ 5 parts of silicone resin particles (Tospearl 120: GE Toshiba Silicone Co., Ltd.
(Refractive index 1.44, average particle size 2.0 μm)
・ 75 parts of methyl ethyl ketone ・ 75 parts of toluene
[Example 5]
The same adhesive layer coating solution as in Example 1 was applied to the aluminum-deposited surface of the light-reflective substrate used in Example 1 and dried to form an adhesive layer having a dry coating thickness of 10 μm. Next, a member (AK Tint: Kimoto) having the same light shielding layer as in Example 1 was laminated on the adhesive layer from the plastic film side. Next, the same light-scattering layer coating solution as in Example 1 was applied on the light-shielding layer and dried to form a light-scattering layer having a dry film thickness of 35 μm (the film thickness based on the portion without the light-shielding portion). Thus, a reflective screen was obtained (FIG. 4).
[0044]
[Comparative Example 1]
A reflective screen was obtained in the same manner as in Example 1, except that the pressure-sensitive adhesive layer was not provided on the light-scattering layer and the member having the light-shielding layer was not laminated.
[0045]
[Comparative Example 2]
A reflective screen was obtained in the same manner as in Example 4, except that the adhesive layer was not provided on the light-scattering layer of Example 4 and the member having the light-shielding layer was not laminated.
[0046]
The liquid crystal projector (XV-P3: Sharp Corporation) was used to project the reflective screens obtained in Examples and Comparative Examples under illumination of a fluorescent lamp, and the following items were evaluated. Table 1 shows the results.
[0047]
(1) As a result of visual evaluation of the projector image while changing the illuminance of the contrast fluorescent lamp, those with high contrast and good visibility even in a bright state where the illuminance is 1000 lx or more are marked with “◎”, and those with an illuminance of 500 lx or more and less than 1000 lx are visually recognized. Those having good properties were rated as “○”, and those visually recognized when the illuminance was less than 500 lx were rated as “x”. The illuminance is the illuminance at the center of the screen when the projector is not projected.
[0048]
[Table 1]

[0049]
As is clear from the results in Table 1, the devices of Examples 1 to 5 were able to display images with high contrast and good visibility even in a bright environment. In particular, in Examples 1 and 2, the backscattering light of the light-scattering layer is almost nonexistent, the area of the light-transmitting portion of the light-shielding layer is 30%, and light is reflected from the light-reflective substrate side. Since the scattering layer and the light-shielding layer were formed in this order, the contrast was very excellent.
[0050]
Comparative Examples 1 and 2 have no light-shielding layer. Therefore, the brightness of the bright color display portion is increased by the amount of light not being shielded, but in a bright environment, the contrast is reduced and the image is difficult to see.
[0051]
【The invention's effect】
As described above, the reflective screen of the present invention has a light scattering layer and a light-shielding layer composed of a mixed pattern of a light-transmitting portion and a light-shielding portion on the same surface of a light-reflective substrate. Therefore, a display with high contrast can be obtained even in a bright environment around the screen, and it can be used as a reflective screen for a bright room.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of the reflective screen of the present invention. FIG. 2 is a cross-sectional view showing another embodiment of the reflective screen of the present invention. FIG. 3 is another view of the reflective screen of the present invention. FIG. 4 is a sectional view showing another embodiment of the reflective screen of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Light reflective base material 2 ... Light scattering layer 31 ... Light transmission part 32 ... Light shielding part 3 ... Light shielding layer 4 ... Plastic film 5 ... Adhesive layer 6 ...・ Reflective screen

Claims (5)

A reflective screen comprising a light-scattering layer and a light-shielding layer comprising a mixed pattern of a light-transmitting portion and a light-shielding portion on the same surface of a light-reflective substrate. The reflective screen according to claim 1, wherein an area of a light transmitting portion of the light shielding layer is 5 to 80% of an area of the light shielding layer. The reflective screen according to claim 1, further comprising the light scattering layer and the light shielding layer in this order from the light reflective substrate side. The reflective screen according to any one of claims 1 to 3, wherein the light scattering layer comprises at least spherical fine particles and a transparent binder. The average particle diameter of the spherical fine particles is 1.0 μm to 10.0 μm, and the relative refractive index n of the spherical fine particles with respect to the refractive index of the transparent binder is 0.91 <n <1.09 (where n ≠ 1. The reflective screen according to claim 4, wherein the reflective screen is (00).

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