JP2010197956A - Screen and projection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen for obtaining high-brightness and high-contrast image. <P>SOLUTION: The screen includes a reflecting layer 3 for reflecting projected light L and an external light absorbing layer 5 provided on the viewing side so as to cover the reflecting layer 3, and the external light absorbing layer 5 has a plurality of eaves-shaped external light absorbing members 51 having light absorbing surfaces AS, and the plurality of external light absorbing members 51 are extended like stripes in a normal direction of an incidence surface relating to the projected light L, and at least one of intervals of the plurality of external light absorbing members 51 is different from the other intervals. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a screen and a projection system.

  2. Description of the Related Art Conventionally, a reflective screen has been used as a projection surface for an enlarged image for presentations such as exhibitions, academic conferences, and conferences using a projector (projection display device), or for viewing a video in a home theater or the like.

  Conventional reflective screens reflect projected light from a projector to display a projected image, and also reflect external light (disturbance light) derived from the usage environment such as illumination light and sunlight entering from a window. However, in a bright place, there is a problem that the contrast, which is the luminance ratio between “white (maximum luminance)” and “black (minimum luminance)”, is low, making it difficult to use the projector. Therefore, by increasing the maximum brightness or reducing the minimum brightness by suppressing the influence of ambient light that causes a decrease in contrast, such as sunlight and illumination light, it is possible to achieve high contrast in a bright room. The target screen is being developed.

  As such a screen, for example, a Fresnel-shaped member is arranged on a screen substrate to achieve both high-contrast absorption and disturbance light absorption (for example, Patent Documents). 1).

  In Patent Document 1, in a plurality of projections and depressions that extend in the horizontal direction of the screen and form a Fresnel shape, an inclined surface that faces the lower side of the screen reflects reflected light from below, and an inclined surface that faces the upper side of the screen starts from above. High contrast image display is realized by absorbing disturbance light.

JP 05-011346 A

  In the configuration described in the above-mentioned patent document, the incident angle of ambient light that can be absorbed is determined by the angle of the inclined surface of each concave and convex. However, since the incident angle of ambient light on the screen projection surface varies depending on the usage environment of the screen, the decrease in the minimum luminance tends to be insufficient depending on the usage environment in the screen of the conventional configuration, and it is stable and optimal. It was difficult to obtain contrast characteristics.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a screen for obtaining a high-brightness and high-contrast image.

  In order to solve the above problems, the screen of the present invention includes a reflective layer that reflects projection light, and an external light absorption layer that covers the reflective layer and is provided on the viewing side. The plurality of external light absorbing members having a light-absorbing surface, wherein the plurality of external light absorbing members extend in a stripe shape in the normal direction of the incident surface related to the projection light, and The interval between the external light absorbing members is characterized in that at least one interval is different from other intervals.

  According to this configuration, disturbance light (external light) that causes a reduction in contrast is reduced because it is absorbed by the external light absorbing member, and it becomes easy to increase the contrast by lowering the minimum luminance in front of the screen. In addition, when the external light absorbing members having the above-described configuration are arranged at equal intervals, interference may occur with the pixels of the projected image, and interference fringes called “moire” may occur in the projected image, resulting in a reduction in image quality. . However, since the external light absorbing members of the configuration of the present invention are arranged at unequal intervals, the occurrence of moire can be suppressed without interference between the pixels of the projection image and the external light absorbing member. Therefore, it is possible to provide a screen capable of obtaining a high-contrast and high-quality image. Here, the “incident surface” is a surface that includes the optical axis of the incident light incident on the screen and is perpendicular to the screen surface.

In the present invention, it is desirable that an interval between the external light absorbing members is set at random.
“Random” as used herein refers to a state in which the arrangement of the external light absorbing member is completely irregular without even the periodicity of being repeated at unequal intervals of a certain period. Therefore, according to this structure, generation | occurrence | production of the moire resulting from interference with the pixel of a projection image and an external light absorption member can be suppressed completely.

In the present invention, with the predetermined position in the arrangement direction of the plurality of external light absorbing members as a reference position, each of the bowl-shaped external light absorbing members is inclined toward the reference position as the distance from the reference position increases. It is desirable that
According to this configuration, when the observer observes the projection image from the normal direction of the screen at the reference position, the plurality of external light absorbing members are just inclined toward the observer. Therefore, it is difficult for the observer to see the external light absorbing member, and a screen capable of displaying a good image can be provided.

In the present invention, it is desirable that a light reflecting surface be provided on the surface of the external light absorbing member opposite to the incident direction of the external light.
According to this configuration, out of the projection light incident on the external light absorbing member, the projection light incident on the surface opposite to the incident direction of the external light is not absorbed by the external light absorbing member. The use efficiency can be improved and a high brightness screen can be provided.

In the present invention, it is desirable that a plurality of the external light absorption layers be provided in a stacked manner.
According to this configuration, since the probability of absorbing disturbance light increases, it is possible to provide a screen that can more reliably remove disturbance light and obtain a high-contrast image.

In the present invention, each of the external light absorbing members of the plurality of external light absorbing layers is preferably disposed at a position where they do not overlap each other in a planar manner.
When multiple external light absorbing members overlap, the shadow of the external light absorbing member itself or the external light absorbing member becomes thick, so that it can be easily seen by the observer, and streaky luminance unevenness that causes deterioration in image quality may occur. There is. However, according to this configuration, since the external light absorbing member is hardly visible, it is possible to provide a screen that realizes high-quality image display in addition to high contrast by reliable disturbance light absorption.

In the present invention, it is desirable to have a light diffusion layer for diffusing incident light on the side of the external light absorption layer opposite to the reflection layer.
According to this configuration, it is possible to impart scattering to the light reflected from the screen. Therefore, it is possible to provide a reflective screen that can average the intensity distribution of reflected light on the screen surface and prevent a phenomenon (hot spot) in which a part of a projected image appears brightly shining. it can.

A projection system according to the present invention includes the screen according to the present invention, and a projection display device that projects an image onto the screen.
According to this configuration, a uniform and bright projection image can be obtained even when a low-output projector is used, so that a projection system with low power consumption can be realized while maintaining image quality.

It is a perspective view which shows the screen and projection system of this invention. It is explanatory drawing of the screen which concerns on 1st Embodiment of this invention. It is explanatory drawing explaining the function of the screen of this invention. It is explanatory drawing of the screen which concerns on the modification of this embodiment. It is explanatory drawing of the screen which concerns on 2nd Embodiment of this invention. It is a simulation result which shows the effect of the screen of 2nd Embodiment. It is a simulation result which shows the effect of the screen of 2nd Embodiment.

[First Embodiment]
Hereinafter, the screen according to the first embodiment of the present invention will be described with reference to FIGS. In all the drawings below, the film thicknesses and dimensional ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.

  FIG. 1 is a perspective view showing a screen 1A of the present embodiment and a projection system PS of the present embodiment.

  As shown in the figure, the screen 1A of the present embodiment is a reflective screen, and has a reflective layer 3 on the projection surface 1a and a plurality of louver-like (saddle-shaped) external light absorptions extending in the horizontal direction. The member 51 has the external light absorption layer 5 provided in stripes. Further, since the screen 1A reflects the projection light L projected from the proximity projection type projector (projection type display device) PJ disposed obliquely below the front side front side, the screen 1A has a horizontally long rectangular plan view shape. Presented. The projection system PS is configured by adding a projector PJ to the screen 1A.

  The screen 1A of the present invention favorably reflects the projection light L projected on the projection surface 1a to the front surface of the screen 1A, and absorbs disturbance light OL such as sunlight or light from the light by the external light absorbing member 51. Thus, the screen can display a high-contrast image. Details will be described below.

  FIG. 2 is an explanatory diagram of the screen 1A and is a partial perspective view including a cross-sectional view taken along line AA in FIG.

  As shown in the figure, the screen 1A includes a reflection layer 3 provided on the base material 2, an external light absorption layer 5 including a plurality of external light absorption members 51 provided on the reflection layer 3, and external light absorption. And a light diffusion layer 7 provided on the front surface so as to cover the layer 5.

  The base material 2 is formed using a black light absorbing material made of a filler that absorbs light and a binder resin. The filler absorbs natural light or white light, and is made of a pigment such as carbon black or black pigment particles. As the binder resin, a thermoplastic resin is used, and preferably an elastic thermoplastic elastomer is used. Specifically, urethane resin, polyolefin resin, vinyl chloride resin and the like are preferably used. Moreover, the base material 2 may be added with a curing agent, an antistatic agent, an antifouling treatment agent, an ultraviolet absorber that prevents deterioration of the binder resin, and the like as additives other than the filler and the binder resin.

  In addition, you may provide this base material 2 on the support material which is not shown in figure. The support material has flexibility such as a film and is formed of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), or the like. Moreover, you may make it raise the intensity | strength of 1 A of screens, for example by sticking an aluminum composite board etc. on the back surface side (side opposite the base material 2) of a support material.

  The reflective layer 3 can be formed using a light reflective material used in a general screen. Examples of such materials include metal materials such as aluminum and silver, and liquid phase methods such as a vapor phase method such as a vapor deposition method and a spray method using an ink made of a binder resin in which metal fine particles are dispersed. Can be formed. In addition, when the reflective layer 3 is formed using these methods, the reflective layer 3 may have a light diffusing function by using glass beads as a forming material.

  The external light absorption layer 5 includes a plurality of louver-shaped external light absorption members 51 extending in the horizontal direction, and a light transmissive light transmission member 52 occupying between the adjacent external light absorption members 51. Yes. The external light absorbing member 51 is provided to stand perpendicular to the surface of the reflective layer 3. The external light absorbing member 51 is formed using, for example, a black resin material, and the light transmitting member 52 is formed using, for example, a light transmitting resin material.

  In the present embodiment, the height H of the external light absorbing member 51 is set to 100 μm. Further, the arrangement interval P (pitch) between the plurality of external light absorbing members 51 is set to a random interval in order to suppress moire from the projection image by the projector PJ. The term “random” as used herein refers to a state where there is no regularity in the arrangement interval P of the external light absorbing member 51. In the present embodiment, the arrangement interval P of the external light absorbing members 51 is 200 ± 100 μm. Such non-uniformity in the arrangement interval is larger than that due to a normal molding error (± several μm).

  Of the side surfaces of the external light absorbing member 51, the light absorbing surface AS is formed on the surface on the upper side in the vertical direction of the external light absorbing member 51, and the light reflecting surface RS is formed on the surface on the lower side in the vertical direction of the external light absorbing member 51. Is formed.

  On the light absorption surface AS, the disturbance light OL is absorbed by the black external light absorption member 51. Therefore, the light absorption surface AS is provided so as to face the incident direction of the disturbance light OL. Here, since the incident direction of the disturbance light OL differs depending on the installation situation, it is preferable that the disturbance light OL is designed to face the incident direction of the disturbance light which is a major factor among the disturbance lights assumed depending on the installation situation.

  For example, when the installation location of the screen 1A has no window into which sunlight is inserted and the cause of disturbance light is mainly light from the ceiling lamp, the light absorption surface AS faces the ceiling when the screen 1A is installed. Set to. In addition, when it is assumed that disturbance light in two different directions (for example, light from a ceiling light and sunlight inserted from a window on a wall) is incident on the installation location, It can be set to face.

  Moreover, in order to effectively absorb disturbance light by the light absorption surface AS, the light absorption surfaces AS of the plurality of external light absorption members 51 are directed in substantially the same direction. In the figure, the light absorption surface AS is provided to face upward so as to absorb disturbance light from above in the vertical direction.

  On the other hand, the light reflecting surface RS is made of a reflective metal such as aluminum or silver by a vapor phase method such as a vapor deposition method or a liquid phase method such as a spray method using an ink made of a binder resin in which metal fine particles are dispersed. Is formed, and reflects light incident on the surface.

  Such an external light absorption layer 5 is formed as follows, for example. First, the light transmissive member 52 is formed by irradiating the ultraviolet curable resin thinly extending on the surface of the reflective layer 3 with ultraviolet rays being applied while the transfer mold of the convex external light absorbing member 51 is pressed against the resin. . Thereafter, the transfer mold is removed, and a groove portion formed by the transfer mold is poured and filled with black ultraviolet curable resin, and the external light absorbing member 51 is formed by irradiating and curing again with ultraviolet rays. The light absorption layer 5 is used.

  The light diffusion layer 7 has a deflection function of diffusing the projection light L to widen the horizontal viewing angle. The material for forming the light diffusion layer 7 is a material in which a filler (diffusion agent) is dispersed in a colorless and translucent binder resin. As the filler, those in the form of beads or scales can be used, and as the material, silica, titanium oxide, mica, barium sulfate, barium chloride, aluminum or the like can be used.

  As such a light diffusing layer 7, the filler light as well as the binder resin has translucency so that the projection light L from the projector PJ is once transmitted, reflected by the external light absorption layer 5 and transmitted again. It is preferable. Accordingly, a light-transmitting material such as silica is preferably used as the filler. However, when the filler content is relatively small, a non-translucent or semi-translucent filler can be used.

  As the binder resin for the light diffusion layer 7, a urethane resin or an acrylic resin is particularly preferably used. Thus, if a urethane resin or an acrylic resin is used, the light diffusion layer 7 functions as a protective layer for protecting the surface of the screen 1A.

Furthermore, a thin protective film may be provided on the outermost surface of the light diffusion layer 7 as a protective film of the screen 1A.
The screen 1A of the present embodiment is configured as described above.

  3A and 3B are explanatory diagrams for explaining the function of the screen 1A. FIG. 3A shows the behavior with respect to the projection light L, and FIG. 3B shows the behavior with respect to the disturbance light OL.

  As shown in FIG. 3A, the normal projection light L is projected from a projector arranged in front of the screen 1A, and therefore the incident angle θ1 with respect to the projection surface of the screen is small. Here, the “projected surface” refers to a virtual plane on which a projected image formed by the projection light L is projected when the surface of the screen is flat.

  The projection light L incident at such an incident angle θ1 is not easily incident on the light absorption surface AS of the external light absorbing member 51, and most of the light reaches the reflection layer 3 without being almost absorbed. Further, since the projection light L reaching the reflection layer 3 is reflected at a small reflection angle corresponding to the incident angle, it is difficult to enter the light absorbing surface AS of the external light absorbing member 51 as in the case of the incident light, and most of the external light is external light. A projection image is formed through the absorption layer 5.

  On the other hand, as shown in FIG. 3B, the disturbance light OL is mainly sunlight from a window or light from a ceiling lamp, and has a large incident angle θ2 with respect to the projection surface of the normal screen. Therefore, the disturbance light OL incident on the external light absorption layer 5 is likely to enter the light absorption surface AS of the external light absorption member 51.

  In addition, part of the disturbance light OL that has reached the reflective layer 3 is reflected at a large reflection angle corresponding to the incident angle, so that it is likely to be incident on the light absorption surface AS of the external light absorbing member 51 as in the case of the incident. Most of the disturbance light OL is absorbed by the external light absorption layer 5. Therefore, the disturbance light OL reflected to the front of the screen 1A is very small, and high contrast can be realized.

  In the screen 1A of the present embodiment, the projection light L and the disturbance light OL exhibit the above behavior, thereby reducing the ratio of the disturbance light OL included in the projection image and reducing the minimum luminance to achieve high contrast. ing.

  According to the screen 1A having the above-described configuration, it is possible to improve the contrast of the projected image satisfactorily and realize high-quality image display. In addition, since the projection system PS using the screen 1A can obtain a uniform and bright projection image even when the low-output projector PJ is used, the projection system PS with low power consumption can be realized while maintaining the image quality.

  In the present embodiment, the arrangement interval P of the plurality of external light absorbing members 51 is random. However, if the arrangement interval P is not equal to each other, a certain unequal interval arrangement may be repeated.

  In the present embodiment, the light reflecting surface RS is provided on the lower surface of the external light absorbing member 51, but may be omitted.

  Further, in the present embodiment, the light diffusion layer 7 is provided to diffuse the projection light L and the horizontal viewing angle is widened. However, for example, by providing the surface of the reflection layer 3 with an uneven shape, the reflection layer 3 is provided. If the function of expanding the horizontal viewing angle is added to the light diffusion layer 7, the light diffusion layer 7 may be omitted.

  In the present embodiment, the louver-shaped external light absorbing member 51 is provided to stand perpendicular to the reflective layer 3, but the present invention is not limited to this.

  FIG. 4 is an explanatory view showing a screen 1B which is a modification of the present embodiment. As shown in the figure, each of the plurality of external light absorbing members 51 is provided to be inclined toward the reference position R on the screen. If the observer V who has adjusted the viewpoint position to the height of the reference position R observes the projection image projected on the screen 1B having such a configuration, it is suitable for increasing the contrast.

  That is, if each louver-shaped outside light absorbing member 51 has an inclination as shown in the figure, the outside light absorbing member 51 is inclined to the observer V side. The light absorbing member 51 becomes difficult to visually recognize. In addition, since the incident angle of the disturbance light OL with respect to the light absorption surface AS becomes small, the external light absorption member 51 can absorb the disturbance light OL satisfactorily. Therefore, the screen 1B realizes a good image display with high contrast.

[Second Embodiment]
FIG. 5 is an explanatory diagram of a screen 1C according to the second embodiment of the present invention, and corresponds to FIG. The screen 1C of the present embodiment is partially in common with the screen 1A of the first embodiment. The difference is that the external light absorption layer 5 is formed by laminating a plurality of layers (three layers in the figure). Therefore, in this embodiment, the same code | symbol is attached | subjected about the component which is common in 1st Embodiment, and detailed description is abbreviate | omitted.

  In the screen 1C, as shown in FIG. 5A, for the projection light L having a small incident angle θ1 with respect to the projection surface of the screen, the external light absorbing member 51 is similar to the screen 1A of the first embodiment. The light absorption surface AS is hardly absorbed and most of the projected light passes through the external light absorption layer 5 to form a projection image.

  Further, as shown in FIG. 5 (b), the disturbance light OL having a large incident angle θ2 is absorbed by each external light absorption layer 5, so that the probability of absorbing the disturbance light OL is increased, and the disturbance light OL is more reliably absorbed. It can be removed.

  6 and 7 are simulation results showing the effect of the screen of the present embodiment. Here, evaluation was performed on a screen using only one external light absorption layer (screen 1A of the first embodiment), a screen in which two layers were stacked, and a screen in which three layers were stacked (screen 1C in this embodiment). Hereinafter, the effect of the screen of this embodiment is demonstrated using figures.

FIG. 6 is a graph showing changes in viewing angle characteristics when the number of laminated external light absorption layers is changed. In FIG. 6A, the horizontal axis represents the horizontal angle of the screen (unit: degree), and the vertical axis represents the vertical angle. FIG. 6B is a graph showing the luminance distribution in the horizontal direction with the axis as the luminance (unit: nit, 1 nit = 1 cd / m ² ). FIG. 6B shows the horizontal axis as the vertical angle of the screen and the vertical axis as the luminance. It is a graph which shows the luminance distribution of a perpendicular direction.

  In the axis representing the angle of each graph, 0 degrees indicates the normal direction of the projected surface of the screen, and (a) shows a smaller angle on the left side as viewed from the observer facing the screen, and an angle on the right side. Is shown to be larger. Similarly, (b) shows that the angle is larger toward the upper side and smaller toward the lower side as viewed from the observer.

  Here, the “half-value angle” serving as an index when evaluating the result of FIG. 6 will be described. The half-value angle is a viewing angle at which the luminance becomes 1/2 with respect to the maximum luminance. In the figure, the luminance in the normal direction of the screen indicates the maximum luminance.

  When observing an image projected on the screen, when observing from a position where the viewing angle does not exceed the half-value angle, the observer may not feel uncomfortable about the change in brightness of the projected image and may view a good image. it can. However, when observing from a position exceeding this angle, the observer feels the projected image dark (difficult to see). Therefore, it can be evaluated that the viewing angle indicating the half-value angle is the maximum practical viewing angle of the screen.

  The results shown in FIG. 6 indicate that the viewing angle becomes narrower as the number of external light absorption layers is increased.

  From the results shown in FIG. 6A, with respect to the horizontal viewing angle, the luminance shows a half value of the maximum luminance at the viewing angle within the simulation conditions from one using one external light absorbing layer to three stacked layers. As a result, it was found that a good viewing angle was ensured with any screen.

  On the other hand, from the result of FIG. 6B, the vertical viewing angle is ± 22.5 degrees in the vertical half-value angle of the screen (screen 1C of the present embodiment) in which three layers of external light absorption layers are stacked. It can be seen that the viewing angle is significantly narrower than that of the other single-layer and double-layer screens. However, in a normal usage mode, the screen is not looked up or looked down at a wider viewing angle in the vertical direction, and it can be said that the vertical viewing angle is substantially ensured substantially. Therefore, it was shown that even if the external light absorbing layer is laminated, the screen has a good viewing angle.

  FIG. 7 is a graph showing the ratio of disturbance light included in the projection image when the number of layers of the external light absorption layer is changed.

  In the results shown in the figure, the proportion of disturbance light in the projection image decreases as the number of external light absorption layers of the present invention increases, and the proportion of disturbance light in the projection image is reduced in a three-layer laminated screen. It is about 1%. The decrease in the ratio of disturbance light in the projected image indicates that the influence of disturbance light on the minimum luminance can be suppressed, and as a result, high contrast of the projection image can be realized. .

  From the results of FIGS. 6 and 7, it can be seen that a high-contrast and high-quality image display can be realized on a screen on which an external light absorption layer is laminated.

  Returning to FIG. 5, in the external light absorption layer 6, the external light absorption members 51 of the external light absorption layers 5 may overlap with each other in a plan view, but do not overlap with each other as shown in the figure. It is more desirable that they are arranged at positions.

  It is not particularly difficult to arrange the external light absorbing member 51 in this way. If the external light absorption members 51 in each external light absorption layer 5 are formed at random pitches, it is probable that the external light absorption members 51 of the external light absorption layers 5 overlap each other in a planar manner. Therefore, the desired arrangement can be easily achieved.

  When the plurality of external light absorbing members 51 overlap in a plane, the shadow of the external light absorbing member 51 itself or the external light absorbing member 51 becomes thick so that it can be easily seen by an observer, and stripes that cause image quality degradation. There is a risk of uneven brightness. However, since the external light absorbing members 51 included in the external light absorbing layer 6 of the screen 1C are arranged at positions that do not overlap with each other in a plane, such a problem hardly occurs.

  From the above, the screen 1C of the present embodiment can be a screen 1C that realizes high-quality image display in addition to high contrast by reliable absorption of ambient light OL.

  In the present embodiment, as in the first embodiment, each external light absorbing member 51 may be inclined toward the observer. In that case, the external light absorption members 51 of all the external light absorption layers 5 may be inclined, or only the external light absorption members 51 of some external light absorption layers 5 may be inclined. .

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1A-1C ... Screen, 3 ... Reflection layer, 5, 6 ... External light absorption layer, 7 ... Light diffusion layer, 51 ... External light absorption member, AS ... Light absorption surface, L ... Projection light, OL ... Disturbance light (outside Light), P ... interval, PJ ... projector (projection type display device), PS ... projection system, RS ... light reflecting surface, V ... observer,

Claims (8)

A reflective layer that reflects the projected light;
An external light absorbing layer provided on the viewing side covering the reflective layer,
The external light absorption layer has a plurality of bowl-shaped external light absorption members having a light absorption surface,
The plurality of external light absorbing members extend in a stripe shape in the normal direction of the incident surface related to the projection light,
The screen is characterized in that an interval between the plurality of external light absorbing members is different from at least one other interval.   The screen according to claim 1, wherein an interval between the external light absorbing members is set at random. A predetermined position in the arrangement direction of the plurality of external light absorbing members as a reference position,
3. The screen according to claim 1, wherein each of the bowl-shaped external light absorbing members is inclined toward the reference position as the distance from the reference position increases.   4. The screen according to claim 1, wherein a light reflecting surface is provided on a surface of the external light absorbing member opposite to the light absorbing surface. 5.   The screen according to claim 1, wherein a plurality of the external light absorption layers are provided in a stacked manner.   The screen according to claim 5, wherein each of the external light absorbing members of the plurality of external light absorbing layers is disposed at a position where they do not overlap each other in a planar manner.   The screen according to any one of claims 1 to 6, further comprising a light diffusion layer that diffuses incident light on a viewing side of the external light absorption layer.   A projection system comprising: the screen according to claim 1; and a projection display device that projects an image on the screen.

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