JP2010191036A - Screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen which is simple in configuration, low in cost and easily made large in size, and can obtain a bright and high-contrast image. <P>SOLUTION: The screen includes: a first tabular member 11 including a plurality of openings 14 being light passages for allowing incident light to pass through and light absorbing parts 15 formed around the light passages and absorbing the incident light; and a second tabular member 12 including a plurality of reflecting parts 16 for reflecting the incident light. The reflecting parts 16 are provided in positions corresponding to the light passages, and the first tabular member 11 and the second tabular member 12 are disposed with a space therebetween. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technology for a screen, and more particularly, a screen that displays an image by reflecting light according to an image signal.

  A so-called front projection type projector is used in combination with a reflection type screen that reflects projection light. In an environment where external light such as illumination light from room lighting exists, the external light reflected by the screen together with the projection light travels in the direction of the observer, which may reduce the contrast of the image. For example, Patent Document 1 proposes a technique using a light absorbing layer for absorbing external light and improving image contrast. Patent Document 2 proposes a technique for improving the contrast of an image by providing a pattern of a reflection layer and a light absorption layer, ensuring white image luminance by the reflection layer, and ensuring black image luminance by the light absorption layer. ing. Patent Document 3 proposes a technique for improving brightness and contrast by selectively reflecting light in a specific wavelength region possessed by projection light and utilizing a difference in light beam angle between external light and projection light. Has been.

JP-A-6-75302 JP 2005-121964 A JP 2005-115243 A

  When the reflectance is suppressed by the light absorption layer, the reflectance of not only the external light but also the projected light is lowered, and the luminance of the image is lowered. In the conventional technique using the difference in the light beam angle on the screen, a fine structure such as a louver or a prism is provided. It is difficult to form a fine structure for the entire screen, and the structure becomes complicated, resulting in high costs and an increase in the size of the screen. SUMMARY OF THE INVENTION An object of the present invention is to provide a screen for obtaining a bright and high-contrast image with a simple structure, low cost, and easy enlargement of the screen.

  In order to solve the above-described problems and achieve the object, a screen according to the present invention includes a plurality of light passage portions that allow incident light to pass therethrough, and light that is formed around the light passage portion and absorbs incident light. And a second plate member having a plurality of reflection portions for reflecting incident light, and the reflection portion is located at a position corresponding to the light passage portion. The first plate-like member and the second plate-like member are provided to be spaced from each other.

  The projection light from the projector is reflected by the reflection unit after passing through the light passage unit. Part of the external light incident on the screen is absorbed by the light absorption unit. Further, part of the external light enters the light passage part. By appropriately adjusting the distance between the first plate-like member and the second plate-like member and the size of the light passage portion, the second plate-like member is used to convert the external light traveling at a light beam angle different from the projection light. Is incident on a position other than the reflecting portion to separate projection light and external light. With a simple configuration using the first plate-like member having the light passage portion and the light-absorbing portion and the second plate-like member having the reflection portion, the projection light is efficiently reflected and the reflection of external light is reduced. It becomes possible. Thereby, the screen can be obtained for obtaining a bright and high-contrast image with a simple structure, low cost, and easy enlargement of the screen.

  Moreover, as a preferable aspect of the present invention, it is desirable that the second plate-like member includes a light absorbing portion formed around the reflecting portion. Thereby, reflection of external light can be reduced and an image with high contrast can be obtained.

  Moreover, as a preferable aspect of the present invention, it is desirable that the reflecting portion has a curved surface shape. Thereby, the projection light reflected by the reflecting portion can be diffused and an image can be displayed on the screen.

  Moreover, as a preferable aspect of the present invention, it is desirable to have a scattering structure that scatters light. Thereby, the projection light reflected by the reflecting portion can be further scattered.

  Moreover, as a preferable aspect of the present invention, it is desirable that the scattering structure is provided at a position where the light reflected by the reflecting portion is condensed. As a result, the scattering angle of the projection light can be increased, the projection light can be selectively scattered, and the scattering of external light can be reduced.

  Moreover, as a preferable aspect of the present invention, it is desirable that the scattering structure is formed in the light passage portion. Thereby, the projection light which passes a light passage part can be scattered.

  Moreover, as a preferable aspect of the present invention, it is desirable that the scattering structure is formed in the reflection portion. Thereby, the projection light reflected by the reflection unit can be scattered.

  Moreover, as a preferable aspect of the present invention, the light passing portion has a circular shape, and the distance between the first plate-like member and the second plate-like member is at least three times the circular radius. desirable. Thereby, reflection of external light incident at a light ray angle different from the projection light can be effectively reduced.

It is the perspective view which represented typically the screen which concerns on the Example of this invention. It is the perspective view which showed one opening part and the reflection part corresponding to it. It is a perspective view explaining the structure which can selectively reflect projection light. It is a perspective view explaining the structure which can reduce reflection of external light. It is a top view explaining the overlap of a reflective part and the spot of external light. It is the graph which calculated | required the relationship between (tau) / r and a reflective area ratio. It is a graph showing the relationship between h / r, an angle, and a reflective area ratio. FIG. 10 is a perspective view for explaining a configuration of a screen according to modification example 1; FIG. 10 is a perspective view for explaining a configuration of a screen according to modification example 2. 10 is a perspective view for explaining a configuration of a screen according to modification example 3. FIG.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a perspective view schematically showing a screen 10 according to an embodiment of the present invention. The screen 10 is a reflective screen that reflects projection light from a projector (not shown). The screen 10 includes a first plate member 11, a second plate member 12, and a transparent film 13.

  The first plate-like member 11 includes a plurality of openings 14 and light absorbers 15. The opening 14 has a substantially circular shape. The region in which the opening 14 is formed is a light passage portion that allows incident light to pass therethrough. The openings 14 are provided in parallel in an array in the two-dimensional direction. The light absorber 15 is formed around the opening 14. The light absorber 15 absorbs incident light.

  The second plate-like member 12 includes a plurality of reflecting portions 16 and a light absorbing portion 17. The reflection unit 16 reflects incident light. The reflectors 16 are provided in parallel in an array in the two-dimensional direction. The opening part 14 and the reflection part 16 are provided at positions corresponding to each other with their positions in the two-dimensional direction substantially matching. The light absorbing portion 17 is formed around the reflecting portion 16. The light absorber 17 absorbs incident light.

  The transparent film 13 is a plate-like member configured using a transparent member. The transparent film 13 transmits light incident on the opening 14 in the direction of the second plate member 12 and transmits light reflected by the reflection unit 16 in the direction of the first plate member 11. The 1st plate-shaped member 11 and the 2nd plate-shaped member 12 are arrange | positioned by providing the space | interval through the transparent film 13. As shown in FIG.

  The light absorption parts 15 and 17 are comprised using the light absorption material, for example, light absorption resin. The opening 14 is formed, for example, by punching a plate-shaped light absorbing material by punching. The light absorbing portion 15 of the first plate-like member 11 is a portion other than the portion where the opening 14 is formed in the light absorbing material. The reflection part 16 is formed by vapor-depositing a highly reflective member, for example, a metal member film, for example, in a depression provided in a plate-like light absorbing material. The light absorbing portion 17 of the second plate-like member 12 is a portion other than the portion where the reflecting portion 16 is provided in the light absorbing material.

  FIG. 2 is a perspective view showing one of the openings 14 and the corresponding reflecting portion 16 extracted from the screen 10 shown in FIG. The reflecting portion 16 has a concave curved surface with a curvature. In the figure, it is assumed that a broken line drawn on the reflecting portion 16 is a virtual line for representing that the reflecting portion 16 has a curved surface shape.

  The projection light L1 incident on the opening 14 from the projector passes through the opening 14 and enters the transparent film 13. The projection light L1 that has passed through the transparent film 13 is reflected by the reflecting portion 16 and is emitted from the opening portion 14 through the transparent film 13. Due to the reflection at the curved reflecting portion 16, the projection light L1 once converges and then diffuses. An image can be displayed on the screen 10 by diffusing the projection light L <b> 1 reflected by the reflection unit 16.

  Part of the external light incident on the screen 10 is absorbed by the light absorbing portion 15 of the first plate-like member 11. The external light L 2 that has entered the opening 14 in the screen 10 passes through the opening 14 and enters the transparent film 13. It is assumed that the external light L2 is incident on the screen 10 at a light ray angle different from that of the projection light L1. The external light L2 that has passed through the transparent film 13 is absorbed by the light absorbing portion 17 of the second plate member 12. As described above, the screen 10 selectively reflects the projection light L1 and reduces reflection of the external light L2 by using the difference in the light beam angle. In addition, it is desirable to form an antireflection film in a portion of the transparent film 13 where the opening 14 is formed. Thereby, reflection of the external light L2 at the interface of the transparent film 13 can be reduced, and a reduction in contrast of the image can be reduced.

  FIG. 3 is a perspective view illustrating a configuration that can selectively reflect the projection light L1 using the difference in the light beam angle. The screen 10 is preferably designed such that the projector is disposed on an axis connecting the center position of the opening 14 and the center position of the reflection section 16. Since the divergence angle of the projection light L1 is small and hardly spreads at a distance of about several millimeters between the opening 14 and the reflection part 16, the cross-sectional areas of the light beams at the opening 14 and the reflection part 16 are substantially the same. The planar shape of the reflecting portion 16 is a circular shape similar to the opening portion 14.

  FIG. 4 is a perspective view illustrating a configuration that can reduce reflection of external light L2. The opening 14 and the reflection part 16 both have a circular shape with a radius r. Let h be the interval between the surface on the projector side of the first plate-like member 11 and the surface on the transparent film 13 side of the second plate-like member 12. In order to obtain a bright and high-contrast image, it is desirable to increase the projection light L1 incident on the reflection unit 16 as much as possible and to reduce the external light L2 incident on the reflection unit 16 as much as possible. Here, the outside light L2 incident on the opening 14 at an angle θ with respect to the projection light L1 traveling perpendicular to the first plate member 11 and the second plate member 12 will be described as an example. To do.

FIG. 5 is a plan view for explaining the overlap between the reflecting portion 16 and the spot 18 of the external light L2. Here, it is assumed that the spot 18 of the external light L2 has a circular shape with a radius r. The distance between the center O1 of the reflecting portion 16 and the center O2 of the spot 18 is τ, and the external light L2 travels at an angle θ between the first plate member 11 and the second plate member 12 with an interval h. By doing so, it is expressed by the following equation.
τ = h · tanθ

  When the distance τ = 0, all of the external light L2 that has passed through the opening 14 enters the reflecting portion 16. At this time, the area of the region S where the reflecting portion 16 and the spot 18 overlap is equal to the area of the reflecting portion 16. Further, when the distance τ is equal to or greater than 2r, all of the outside light L2 that has passed through the opening 14 enters the light absorbing portion 17. At this time, the overlapping of the reflecting portion 16 and the spot 18 does not occur. The graph shown in FIG. 6 is obtained by determining the relationship between τ / r and the area ratio of the reflection portion 16 and the region S (hereinafter referred to as the reflection area ratio). The external light L2 incident on the reflecting portion 16 increases as the reflection area ratio approaches 1 and decreases as the reflection area ratio approaches 0.

  FIG. 7 is a graph showing the relationship between the angle θ and the reflection area ratio when the ratio h / r of the distance h to the radius r is changed. As the angle θ increases, the reflection area ratio decreases. The larger the ratio h / r, the higher the effect of reducing the reflection area ratio by increasing the angle θ. Assuming that the amount of the external light L2 reflected by the reflecting portion 16 is proportional to the reflection area ratio, when the radius r is constant, the effect of reducing the external light L2 reflected by the reflecting portion 16 increases as the interval h increases. Become.

  In order to obtain a bright and high-contrast image, it is desirable that the screen 10 can reduce the incident external light L2 with an angle difference of 20 degrees with respect to the projection light L1 to about 30% or less. From the graph shown in FIG. 7, when the ratio h / r is 3, the external light L2 having an angle difference of about 20 degrees is about 30%. Therefore, the distance h between the first plate-like member 11 and the second plate-like member 12 is preferably at least three times the radius r. Note that the larger the ratio h / r, the narrower the angular range of the projection light L1 that is allowed to be reflected by the screen 10, so that the screen 10 can reduce the reflection of the external light L2 and the projection light. It is desirable to form L1 at a ratio h / r that allows efficient reflection. The screen 10 can have an arbitrary angle selection characteristic by appropriately setting the ratio h / r.

  As described above, the screen 10 according to this embodiment includes the first plate-like member 11 including the opening 14 and the light absorbing portion 15, and the second plate-like member 12 including the reflecting portion 16 and the light absorbing portion 17. With a simple configuration using the projection light, it is possible to efficiently reflect the projection light and reduce the reflection of external light. Thereby, it is possible to obtain a bright and high-contrast image with a simple configuration, low cost, and easy enlargement of the screen 10.

  Note that the screen 10 may have a space between the first plate-like member 11 and the second plate-like member 12 instead of the configuration in which the transparent film 13 is provided. In this case, the distance h between the first plate-like member 11 and the second plate-like member 12 is adjusted by using a spacer such as glass beads. When the gap between the first plate member 11 and the second plate member 12 is a gap, by eliminating the difference in refractive index between the first plate member 11 and the second plate member 12, An antireflection film for reducing reflection at the interface becomes unnecessary.

  The first plate-like member 11 may be formed by forming the light-absorbing portion 15 in a plate-like transparent material, in addition to the opening 14 formed in the light-absorbing material. The light absorption part 15 is formed by coloring a transparent material by printing, for example. In this case, in the transparent material, a region other than the region where the light absorbing portion 15 is formed functions as a light passing portion that allows light to pass through.

  The reflecting portion 16 may be a curved surface shape, and may be an aspherical shape or a free curved surface shape as well as a spherical shape with a certain curvature. The screen 10 is not limited to the case where the openings 14 and the reflection portions 16 are uniformly formed for the entire screen 10. For example, the positions of the opening 14 and the reflection part 16 may be changed for each position of the screen 10, and the sizes of the opening 14 and the reflection part 16 may be changed. Further, the screen 10 is not limited to the case where the distance h between the first plate-like member 11 and the second plate-like member 12 is constant for the entire screen 10. For example, the interval h may be changed for each position of the screen 10.

  FIG. 8 is a perspective view for explaining the configuration of the screen according to the first modification of the present embodiment. This modification has a scattering structure that scatters light. In the scattering structure in this modification, the scattering agent 21 is placed at a position where the projection light L1 reflected by the reflecting portion 16 is collected in a transparent layer (not shown) provided on the incident side of the first plate-like member 11. It is configured to be distributed. As the scattering agent 21, a granular material made of a member having a refractive index different from that of the transparent member constituting the transparent layer is used.

  By using the scattering structure, it is possible to further scatter the projection light L1 reflected by the reflecting portion 16. By dispersing the scattering agent 21 at a position where the projection light L1 is condensed, the scattering angle of the projection light L1 reflected by the reflection unit 16 is increased. Moreover, since the area | region which disperse | distributes the scattering agent 21 can be decreased, the projection light L1 can be selectively scattered and the scattering of the external light L2 can be reduced.

  FIG. 9 is a perspective view for explaining the configuration of the screen according to the second modification of the present embodiment. The present modification is characterized by having a light passage portion 23 in which a scattering surface that is a scattering structure is formed. The first plate-like member 22 is obtained by forming a light absorbing portion 15 and a light passage portion 23 in a plate-like transparent material. The light absorbing portion 15 is configured by coloring a plate-like transparent material. The light passage part 23 is configured by applying a scattering surface to a part of the transparent material other than the part where the light absorption part 15 is formed. The scattering surface is formed by applying fine irregularities. According to the present modification, the projection light L1 that passes through the light passage portion 23 can be scattered. In addition, the light passage part 23 is good also as dispersing a scattering agent other than using a scattering surface as a scattering structure.

  FIG. 10 is a perspective view for explaining the configuration of the screen according to the third modification of the present embodiment. The present modification is characterized by having a reflecting portion 24 on which a scattering surface having a scattering structure is formed. The scattering surface is formed by providing fine irregularities on the reflecting surface of the reflecting portion 24. According to this modification, it is possible to scatter the projection light L1 reflected by the reflection unit 24.

  As described above, the screen according to the present invention is suitable for displaying an image using projection light from a front projection type projector.

  DESCRIPTION OF SYMBOLS 10 Screen, 11 1st plate-shaped member, 12 2nd plate-shaped member, 13 Transparent film, 14 Opening part, 15 Light absorption part, 16 Reflection part, 17 Light absorption part, 18 Spot, 21 Scattering agent, 22 1st 1 plate-like member, 23 light passing part, 24 reflecting part

Claims (8)

A first plate-like member comprising: a plurality of light passage portions that allow incident light to pass; and a light absorption portion that is formed around the light passage portion and absorbs incident light;
A second plate-like member having a plurality of reflecting portions for reflecting incident light,
The reflection portion is provided at a position corresponding to the light passage portion,
The screen, wherein the first plate-like member and the second plate-like member are arranged with a space therebetween.   The screen according to claim 1, wherein the second plate-like member includes a light absorption part formed around the reflection part.   The screen according to claim 1, wherein the reflection portion has a curved surface shape.   It has a scattering structure which scatters light, The screen as described in any one of Claims 1-3 characterized by the above-mentioned.   The screen according to claim 4, wherein the scattering structure is provided at a position where the light reflected by the reflecting portion is collected.   The screen according to claim 4, wherein the scattering structure is formed in the light passage portion.   The screen according to claim 4, wherein the scattering structure is formed in the reflecting portion. The light passage part has a circular shape,
The screen according to any one of claims 1 to 7, wherein an interval between the first plate-like member and the second plate-like member is three times or more of the radius of the circular shape. .

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