JP2004061520A - Transmitting screen and projecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitting screen which is superior in contrast in projection in a bright environment. <P>SOLUTION: The screen is constituted so that a light scattering layer 1 and a light shielding layer 2 consisting of a mixed pattern of a light transmitting layer 21 and a light shielding part 22 are provided. Preferably the area of the light transmitting part 21 of the light shielding layer 2 is 5 to 80% of the area of the light shielding layer 2. Furthermore, constituting the light scattering layer 1 from at least spherical particulates and transparent binder is preferable. Moreover, it is preferable that the average particle diameter of the spherical particulate is between 1.0μm to 10.0μm and constitution is that the relative refractive index n of the spherical particulate to the refractive index of the transparent binder is 0.91<n<1.09 (but n≠ 1.00). <P>COPYRIGHT: (C)2004,JPO

Description

【００５１】
表１の結果から明らかなように、実施例１〜５の透過型スクリーンを用いた投映装置によれば、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く、遮光層の光透過部の面積が３０％である透過型スクリーンを用いており、かつ光散乱層側にプロジェクタを配置してなるものであるから、非常にコントラストに優れるものであった。
【００５２】
また、実施例１〜５の透過型スクリーンは、いずれも高い歩留まりで製造することができるものであった。
【００５３】
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。
【００５４】
【発明の効果】
以上のように、本発明の透過型スクリーンは、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、明室用の透過型スクリーンとして使用できる。
【図面の簡単な説明】
【図１】本発明の透過型スクリーンの一実施例を示す断面図
【図２】本発明の透過型スクリーンの他の実施例を示す断面図
【図３】本発明の透過型スクリーンの他の実施例を示す断面図
【図４】本発明の透過型スクリーンの他の実施例を示す断面図
【図５】本発明の透過型スクリーンの他の実施例を示す断面図
【図６】本発明の透過型スクリーンの一使用状態を示す図
【図７】本発明の透過型スクリーンの他の使用状態を示す図
【符号の説明】
１・・・光散乱層
２１・・・光透過部
２２・・・遮光部
２・・・遮光層
３・・・透明体
４・・・粘着層
５・・・視認者
６・・・プロジェクタ
７・・・透過型スクリーン
８・・・投映装置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rear projection transmissive screen, and more particularly to a screen having excellent contrast in projection in a bright environment.
[0002]
[Prior art]
Conventionally, transmission screens have to diffuse image light rays so that images can be viewed in a wide range, and most of the screens are white or milky white and have light transmittance. With a transmissive screen having such characteristics, when the surroundings become bright, ambient light enters the transmissive screen and diffuses this light, so that the screen looks 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]
As one of the countermeasures against this decrease in contrast, attempts have been made to increase the brightness when viewing an image from a specific direction using a Fresnel lens sheet, lenticular lens sheet, etc., but it is effective for dark display parts. And the contrast has not been sufficiently increased. Further, it is difficult to manufacture these lens sheets over a large screen with a high yield.
[0004]
Therefore, in order to obtain a high-contrast and easy-to-view image, it is general that the room is darkened and the periphery of the transmissive screen is darkened as before.
[0005]
[Problems to be solved by the invention]
However, with the spread of liquid crystal projectors and the use of transmissive screens in conferences and other places, the need to brighten the room has increased due to the necessity of taking notes, etc. There is also an increasing demand for transmissive screens that can provide a high-contrast, easy-to-view display without being displayed.
[0006]
Therefore, an object of the present invention is to provide a transmissive screen having excellent contrast in projection in a bright environment, and a projection device using the same.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a transmissive screen of the present invention is characterized by having a light scattering layer and a light shielding layer composed of a mixed pattern of a light transmitting part and a light shielding part.
[0008]
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.
[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]
Further, the projection device of the present invention is characterized in that a projector is arranged on the light-shielding layer side of the transmissive screen.
[0012]
Preferably, a projector is arranged on the light scattering layer side of the transmission screen.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
The transmissive screen of the present invention is characterized by having a light scattering layer and a light shielding layer composed of a mixed pattern of a light transmitting part and a light shielding part. Hereinafter, embodiments of each component will be described.
[0014]
1 to 5 show an embodiment of a transmission screen according to the present invention. As shown in the figure, the transmission screen 7 of the present invention has a light scattering layer 1 and a light shielding layer 2, and in addition to a screen including only the light scattering layer 1 and the light shielding layer 2 (FIGS. 1 and 2), Including the one having the transparent body 3 between the light scattering layer 1 and the light shielding layer 2 (FIG. 3), the one having the light scattering layer 1, the light shielding layer 2, and the transparent body 3 laminated via the adhesive layer 4 (FIG. (Fig. 5).
[0015]
The light scattering layer is made of at least spherical fine particles and a transparent binder, and scatters light projected from the projector side forward (to the viewer) with respect to the traveling direction of the light. Here, the transparent binder is not limited to a solid and may be a fluid such as a liquid or a liquid crystal, as long as it is transparent and capable of uniformly dispersing and holding spherical fine particles. However, in order to maintain the shape of the screen with the light scattering layer alone, glass or a polymer resin is preferable, and a polymer resin is preferable from the viewpoint of handleability and dispersion stability.
[0016]
The glass is not particularly limited as long as the light transmittance of the light-scattering layer is not lost, but generally includes oxide glass such as silicate glass, phosphate glass, and borate glass. Can be
[0017]
The polymer resin is not particularly limited as long as the light transmittance of the light-scattering layer is not lost. Polyester resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate Resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamide resin, polyimide resin, melamine resin Thermoplastic resins such as phenolic resins, silicone resins and fluorine resins, thermosetting resins, ionizing radiation curable resins, and the like can be used.
[0018]
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.
[0019]
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, the light scattered backward among the light incident on the light scattering layer can be reduced, and the image projected from the projector can be projected as a bright image. become.
[0020]
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.
[0021]
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, the light scattered backward among the light incident on the light scattering layer can be reduced, and the image projected from the projector can be projected as a bright image. Become like
[0022]
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.
[0023]
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).
[0024]
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.
[0025]
The light shielding layer 2 is composed of a mixed pattern of the light transmitting part 21 and the light shielding part 22 (FIGS. 1 and 2). 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-scattering layer or on a transparent body described later, a member having a light-shielding portion on the entire surface of the light-scattering layer or the transparent body described later Can be formed by chemically or physically removing a part of the light-shielding portion, or by forming a hole in a member having a light-shielding property.
[0026]
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.
[0027]
The light-shielding layer may be arranged on only one surface of the light scattering layer, or may be arranged on both surfaces of the light scattering layer. When light-shielding layers are provided on both surfaces of the light-scattering layer, the mixed pattern of the light-shielding layers on one surface is substantially in contrast to the mixed pattern of the light-shielding layers on the other surface. It is preferable that the surface is formed so as to have a substantially negative-positive relationship (FIG. 2). With such a configuration, the contrast can be further improved.
[0028]
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. However, as described above, in the case where the light-shielding layer is provided on both sides of the light-scattering layer, the area of the light-transmitting portion of one of the light-shielding layers may be in the above-described range.
[0029]
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 forming a film on a transparent body such as a plastic film.
[0030]
As the transparent body, one obtained by glass-forming the same glass as the transparent binder of the light scattering layer, or one obtained by forming a polymer resin into a sheet can be used. Alternatively, a window glass, a partition plate, or the like can be used. Such a transparent body not only has a role of maintaining the shape of the screen, but also can be a base material when a light scattering layer or a light shielding layer is formed into a paint to form a film.
[0031]
The transmission screen of the present invention includes, for example, directly laminating a light-shielding layer on a light-scattering layer (FIGS. 1 and 2), providing a light-scattering layer and a light-shielding layer on a transparent body (FIG. 3), It can be obtained by laminating a member provided with a light scattering layer and a light-shielding layer via an adhesive layer (FIGS. 4 and 5).
[0032]
The transmission screen of the present invention may have an antireflection layer on at least one surface. 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.
[0033]
Further, the transmission screen of the present invention may have a hard coat layer on at least one surface. As a result, it is possible to prevent the display quality from deteriorating due to the scratch on the screen surface.
[0034]
The transmission screen of the present invention can be used as a projection device by combining with a projector. Here, the projector may be arranged on the light shielding layer side of the transmission screen (FIG. 7), but is preferably arranged on the light scattering layer side of the transmission screen (FIG. 6). By arranging the projector on the light scattering layer side, the contrast can be made more satisfactory.
[0035]
【Example】
Hereinafter, examples of the present invention will be described. Unless otherwise specified, “parts” and “%” are based on weight.
[0036]
[Example 1]
A light-scattering layer having a dry film thickness of 35 μm and a dry film were formed by sequentially applying and drying a light-scattering layer coating solution and an adhesive layer coating solution having the following compositions on a 188 μm-thick polyester film (Lumirror T60: Toray Industries, Inc.). An adhesive layer having a thickness of 10 μm was formed.
[0037]
<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 transmission screen was obtained (FIG. 4).
[0040]
[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 a 188 μm-thick polyester film (Lumirror T60: Toray Industries, Inc.).
[0041]
<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)
[0042]
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 transmission screen.
[0043]
[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 transmissive screen was obtained in the same manner as in Example 1 except for the above.
[0044]
[Example 4]
A transmission 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.
[0045]
<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
[Comparative Example 1]
A transmissive screen was obtained in the same manner as in Example 1, except that the adhesive layer was not provided on the light-scattering layer of Example 1 and the member having the light-shielding layer was not laminated.
[0047]
[Comparative Example 2]
A transmissive screen was obtained in the same manner as in Example 4, 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.
[0048]
The liquid crystal projector (XV-P3: Sharp Corporation) was used to project on the transmission screens obtained in the examples and comparative examples under illumination of a fluorescent lamp, and the following items were evaluated. Table 1 shows the results. In Examples 1 to 4 and Comparative Examples 1 and 2, a projector was configured by arranging a projector on the light scattering layer side, and projection was performed. In addition, as Example 5, the projection screen was formed by using the transmission screen of Example 1 and arranging a projector on the light-shielding layer side to perform projection. FIG. 6 shows a projection state of the first embodiment, and FIG. 7 shows a projection state of the fifth embodiment.
[0049]
(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.
[0050]
[Table 1]

[0051]
As is clear from the results in Table 1, according to the projection devices using the transmissive screens of Examples 1 to 5, it was possible to display images with high contrast and good visibility even in a bright environment. In particular, the first and second embodiments use a transmission screen in which the light scattering layer has almost no backscattered light, the light-transmitting portion of the light-shielding layer has an area of 30%, and a projector is provided on the light-scattering layer side. Were arranged, so that the contrast was extremely excellent.
[0052]
Further, the transmission screens of Examples 1 to 5 could be manufactured with a high yield.
[0053]
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.
[0054]
【The invention's effect】
As described above, the transmission 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. Therefore, a display with high contrast can be obtained even in a bright environment around the screen, and it can be used as a transmissive screen for a bright room.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of a transmission screen of the present invention. FIG. 2 is a cross-sectional view showing another embodiment of a transmission screen of the present invention. FIG. 3 is another view of a transmission screen of the present invention. FIG. 4 is a sectional view showing another embodiment of the transmission screen of the present invention. FIG. 5 is a sectional view showing another embodiment of the transmission screen of the present invention. FIG. 7 shows another use state of the transmission screen of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Light scattering layer 21 ... Light transmission part 22 ... Light shielding part 2 ... Light shielding layer 3 ... Transparent body 4 ... Adhesive layer 5 ... Viewer 6 ... Projector 7 ... Transmissive screen 8 ... Projection device

Claims (6)

A transmissive screen comprising a light scattering layer and a light shielding layer comprising a mixed pattern of a light transmitting part and a light shielding part. The transmissive screen according to claim 1, wherein the area of the light transmitting portion of the light shielding layer is 5 to 80% of the area of the light shielding layer. 3. The transmission screen according to claim 1, 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 transmission screen according to claim 3, wherein A projection device, comprising: a projector disposed on a light-shielding layer side of the transmission screen according to claim 1. A projection device, comprising: a projector disposed on the light scattering layer side of the transmission screen according to claim 1.

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