JP2008052097A - Screen and image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen that allows the display of a high contrast image without decreasing the brightness of a display screen even in an environment having external light, and to provide an image display apparatus using the screen. <P>SOLUTION: The screen 1 is divided into a first area A where light bent by a lenticular sheet 3 advances and a second area B where light bent by the sheet 3 does not advance. Black stripes 5 are formed on the observer side outermost surface of the second area B. Accordingly, since the outermost surface on which external light D falls can be covered with the black strips 5 to the maximum without interfering the emission of light from a projecting device, the external light D is absorbed and scattering can be restrained to the greatest degree. In addition, a scattering member 4 itself does not need to have an ND filter effect. This prevents a decrease in the brightness of white and allows the display of a high contrast image. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a screen and an image display device using the screen.

  Conventionally, in the screen of the rear projector display device that projects the light from the projection device on the side opposite to the observer, a lenticular sheet that sets the diffusivity in a certain direction according to the shape of the lens in order to obtain a predetermined wide viewing angle characteristic, For example, vertical diffusion and horizontal diffusion are set and controlled using another diffusion sheet that sets the diffusion degree in other directions.

  However, in such a screen, there is a problem that external light from the viewer side is scattered over the entire screen surface, and the black image of the screen appears to the viewer and the contrast is lowered.

In view of this, for example, a black stripe is provided between the lenticular sheet and the diffusion sheet, and the back of the diffusion sheet is made black so as to reduce the black float and improve the contrast.
(For example, refer to Patent Document 1).
JP 2006-113098 A (FIGS. 3 and 4)

  However, although the method described in Patent Document 1 has the effect of improving the contrast by reducing the black float, it is insufficient, and the scattering of external light on the diffusion sheet cannot be minimized.

  Also, a contrivance of imparting an ND (Neutral Density) filter effect to the diffusion sheet itself to make the screen black can be considered, but since it is an ND filter, there is a disadvantage that the brightness of not only black but also white is lowered.

  In view of the circumstances as described above, an object of the present invention is to provide a screen capable of displaying a high-contrast image without reducing the brightness of the display screen even in an environment with external light, and an image display device using the screen. It is in.

  In order to achieve the above object, a screen according to the present invention projects light from a projection device on the side opposite to an observer, and in the projecting screen, an optical member that converts the light into substantially parallel light, and A lenticular sheet that refracts substantially parallel light in a direction perpendicular to the direction of the light, and at least a first region where light refracted in the vertical direction travels, and the refracted light is provided in at least the vertical direction. A diffusing member that diffuses in a horizontal direction at right angles to the light source; and a plurality of black stripes provided on the outermost surface side on the viewer side in the second region where the refracted light does not travel. To do. Here, the “projection device” is a device in which light from a light source is emitted after being modulated by a spatial light modulator, for example, a projector, and an “optical member”, for example, a Fresnel lens sheet. The “lenticular sheet” may be one that refracts light only in the vertical direction.

  In the present invention, the screen is divided into a first region in which the light refracted by the optical member and the lenticular sheet travels and a second region in which the refracted light does not travel. A black stripe was provided on the surface. Therefore, it is possible to cover the outermost surface to which the external light hits without interfering with the emission of the light from the projection device with the black stripe as much as possible, and to absorb the external light and suppress the scattering as much as possible.

  Further, since it is not necessary to give the diffusing member, for example, the diffusing sheet itself, an ND filter effect, it is possible to prevent a decrease in white luminance and to display an image with high contrast.

  According to an aspect of the present invention, the diffusion member includes the second region and is laminated on the viewer side surface of the lenticular sheet, and the plurality of black stripes are the observer of the diffusion member. It is provided on the side surface. As a result, scattering of external light on the observer side surface of the diffusing member can be prevented to the maximum extent without disturbing the emission of light from the projection device, and black paint is applied to the diffusing member, for example, the diffusion sheet by a printing method. By doing so, it can be easily manufactured, and the manufacturing cost can be reduced.

  Further, since the diffusion member is formed in a relatively wide area, a special sheet such as a hologram diffusion sheet can be easily manufactured.

  According to an aspect of the present invention, the diffusion member is a hologram diffusion sheet. Thereby, it becomes possible to perform diffusion control more freely than a normal diffusion member, and it is possible to create a screen having a diffusion characteristic with a higher degree of freedom. For example, diffusion members are generally manufactured by mixing a transparent resin with a diffusion material such as an inorganic compound. However, it is difficult for such a method to have diffusion anisotropy in which the vertical and horizontal diffusion angles are significantly different. It is. In that regard, a hologram diffusion sheet can be manufactured so as to have diffusion anisotropy relatively easily.

  According to one form of this invention, the said horizontal diffusion angle of the said hologram diffusion sheet is 0.1 degree or more and 2 degrees or less, It is characterized by the above-mentioned.

  For example, when a screen having a lenticular sheet and a diffusion sheet that diffuses in the same direction is used for the stereoscopic display rear projector, it is difficult to adjust the diffusion degree in the horizontal direction, and the composite images of a plurality of vertical line displays partially overlap. As a whole, it becomes a blurred stereoscopic image. Further, if a diffusion sheet is not used, a gap is generated between the vertical lines, resulting in a stereoscopic image in which the vertical stripes are conspicuous. Therefore, by using a hologram diffusion sheet as a diffusing member and setting the diffusivity in the horizontal direction to 0.1 degrees or more and 2 degrees or less, even if it is used for a stereoscopic display rear projector, it does not blur entirely, and the vertical stripe It is possible to obtain an inconspicuous stereoscopic image.

  According to an aspect of the present invention, the plurality of black stripes are stacked on the viewer side surface of the lenticular sheet. Thereby, since there is no diffusing member between the lenticular sheet and the black stripe, the thickness of the entire screen can be reduced.

  According to an aspect of the present invention, the diffusing member is provided only between the black stripes. As a result, all the light passing through the lenticular sheet passes through this diffusing member and can be diffused in the horizontal direction, while scattering with respect to external light occurs only between the black stripes that are the diffusing member. Since the light striking the black stripe other than the diffusing member is absorbed, the black float is reliably reduced by the area ratio of the black stripe.

  Further, since the light passing through the diffusing member is not absorbed as when passing through the ND filter, white brightness is not lowered, and higher contrast and higher luminance characteristics can be obtained.

  According to an aspect of the present invention, a transparent base material is further provided between the black stripes, and the diffusion member is formed on the observer side surface of the transparent base material. Thereby, for example, the diffusing member can be easily formed by frosting the transparent base material formed between the black stripes by the sandblasting method, and the manufacturing cost can be reduced.

  An image display device according to another aspect of the present invention includes a projection device that emits light from a light source that is modulated by a spatial light modulation unit and emits the light from the projection device on the opposite side of the screen observer. In the image display device that projects an image on the screen, the screen includes an optical member that converts the light into substantially parallel light, and a lenticular sheet that refracts the substantially parallel light in a direction perpendicular to the direction of the light. A diffusing member that is provided at least in a first region where light refracted in the vertical direction travels and diffuses the refracted light in a horizontal direction perpendicular to at least the vertical direction; and the refracted light includes A plurality of black stripes provided on the outermost surface side on the observer side in the second region that does not proceed.

  In the present invention, the screen is divided into a first region in which the light refracted by the optical member and the lenticular sheet travels and a second region in which the refracted light does not travel. A black stripe was provided on the surface. Therefore, the outermost surface that is exposed to external light can be covered with black stripes as much as possible without interfering with the emission of light from the projection device, so that an image display device that absorbs external light and suppresses scattering to the maximum and has less black floating. Can be obtained.

  Further, since it is not necessary to give the ND filter effect to the diffusing member, for example, the diffusing sheet itself, it is possible to prevent a decrease in white luminance and to achieve an image display device with high contrast.

  As described above, according to the present invention, it is possible to display an image with high contrast with little black floating without reducing the luminance of the display screen even in an environment where there is external light.

  Hereinafter, a rear projector type image display device will be described as an example of a screen and an image display device including the screen according to an embodiment of the present invention with reference to the drawings.

  FIG. 1 is a perspective view of a screen according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining how light travels in the partial cross section of FIG. 1, and FIG. 3 is an explanatory diagram for an image display device. is there.

  For example, as shown in FIG. 1, a screen 1 includes a Fresnel lens sheet 2 as an optical member that converts light from a projection device, which will be described later, into parallel rays, and a lenticular that refracts the parallel rays only in a direction perpendicular to the direction of the rays. The sheet 3 includes a diffusing member 4 for diffusing the refracted light beam in the horizontal direction, a black stripe 5 provided on the viewer side of the diffusing member 4, and the like.

  Here, the Fresnel lens sheet 2 converts the projection light (outlined arrow in FIG. 1) emitted from the projection device into a substantially parallel light beam at an angle (Z-axis direction shown in FIG. 2) that is nearly perpendicular to the lenticular sheet 3. Can be made.

  The lenticular sheet 3 includes, for example, as shown in FIGS. 1 and 2, a cylindrical lens portion 3a on the projection apparatus side and a lens base portion 3b on the observer side. In the cylindrical lens portion 3a, a plurality of cylindrical lenses extending in a substantially semicircular cross section in the horizontal direction are arranged in parallel on the flat lens base portion 3b. Thereby, parallel rays can be refracted and scattered only in the direction (Y-axis direction in FIG. 2) perpendicular to the direction (Z-axis direction in FIGS. 1 and 2).

  The diffusing member 4 diffuses in a horizontal direction (X-axis direction in FIG. 2) perpendicular to the vertical direction, and can be manufactured by, for example, a method of dispersing and mixing an inorganic compound in a transparent resin. The diffusion member 4 manufactured by such a method has a property of diffusing in the same direction, and can be diffused in the horizontal direction by being superimposed on the lenticular sheet.

  Further, for example, as shown in FIGS. 1 and 2, the diffusing member 4 has a first region A (A in FIGS. 1 and 2) through which the light refracted by the cylindrical lens portion 3a of the lenticular sheet 3 travels and is refracted. The lenticular sheet 3 is formed in a sheet shape on the entire side surface of the observer so as to include the second region B (B in FIGS. 1 and 2) where the light beam does not travel.

  The black stripe 5 is formed on the side of the viewer of the diffusing member 4. For example, as shown in FIGS. 1 and 2, the second stripe B (where the light refracted by the cylindrical lens portion 3 a of the lenticular sheet 3 does not travel). In FIG. 1 and FIG. 2B, a plurality of lines are arranged in a substantially rectangular shape in the horizontal direction (X-axis direction in FIG. 1 and FIG. 2).

  For example, as shown in FIG. 2, the black stripe 5 is provided in the second region B formed in a range that moves up and down in the vertical direction around the boundary between adjacent cylindrical lenses.

  The black stripe 5 can be manufactured by applying a black paint on the diffusing member 4 using a printing method. As other manufacturing methods, for example, a black paint that can be photoetched is applied to the entire surface of the diffusing member 4 in advance, and light having the same light distribution characteristics as the light projected from the projection device from the lenticular sheet side is applied, It can also be manufactured by etching only the portion exposed to the light. As a result, an optimum black stripe pattern can be formed on the diffusion member by self-alignment.

  In the above description, the diffusion member 4 has been described in which, for example, an inorganic compound is dispersed and mixed in the transparent resin. However, the diffusion member 4 is not limited to this and, for example, more free diffusion control is possible than a normal diffusion member. A hologram diffusion sheet may be used. Thereby, it is possible to create the screen 1 having a diffusion characteristic with a higher degree of freedom.

  Next, a rear projector type image display device 50 that is not a stereoscopic image display device described later will be briefly described.

  For example, as shown in FIG. 3, the image display device 50 includes a screen 1, a projection device 51 that projects image light onto the screen 1, mirrors 52 and 53, and the like, which are housed in a case 54.

  Here, the projection device 51 has a light source (not shown) and a one-dimensional spatial light modulation unit, and projects image light corresponding to a predetermined video signal onto the mirror 52. The mirror 52 reflects the light from the projection device 51 to the mirror 53, and the mirror 53 reflects the light to enter the screen 1.

  Thereby, the image light emitted from the first region A between the black stripes 5 as the light travels through the Fresnel lens sheet 2, the lenticular sheet 3, and the diffusing member 4 of the screen 1 enters the eyes of the observer. Become. At this time, the external light is greatly absorbed by the black stripe 5 and can be displayed as a good image that does not cause the observer to feel black floating.

  The operation of the screen 1 configured as described above will be described focusing on how light travels.

  First, for example, as shown in FIGS. 1, 2, and 3, when light from the projection device 51 is incident on the projection device side of the Fresnel lens sheet 2, the light is converted into a substantially parallel light beam by the Fresnel lens sheet 2. 3 is emitted. At this time, the emitted light beam has an angle that is substantially perpendicular to the lenticular sheet 3.

  Then, the light emitted from the Fresnel lens sheet 2 enters the cylindrical lens portion 3a of the lenticular sheet 3, and, for example, as shown in FIG. Concentrates most in the vicinity. Thereafter, the light is emitted from the diffusion member 4 while spreading so as to diverge. At this time, the diffusion member 4 diffuses in the horizontal direction due to the diffusion effect in the same direction (equal to the horizontal direction and the vertical direction), and the arrow shown in FIG. As shown in C, the light is emitted from the screen 1 to the observer.

  On the other hand, outside light D (D shown in FIG. 2) from the observer side is scattered in the first region A through which the light refracted by the lenticular sheet 3 passes as shown in FIG. In the second region B where the refracted light except the region A is not transmitted, it is absorbed by the black stripe 5 and is not reflected, so that it is not scattered.

  Thereby, the black floating of the screen display due to scattering of external light is minimized.

  Thus, according to the present embodiment, the screen 1 is divided into the first region A in which the light refracted by the lenticular sheet 3 travels and the second region B in which the refracted light does not travel, and the second region B is divided. The black stripe 5 is provided on the outermost surface of the region B on the viewer side. Therefore, it is possible to cover the outermost surface, which is exposed to the external light D, without interfering with the emission of light from the projection device with the black stripe 5 as much as possible, so that the external light D can be absorbed and scattering can be suppressed to the maximum.

  Moreover, since it is not necessary to give the ND filter effect to the diffusing member 4 itself, it is possible to prevent a decrease in white luminance and to display an image with high contrast.

  Further, the diffusing member 4 is laminated on the side of the observer including the second region B, and the plurality of black stripes 5 are provided on the observer side surface of the lenticular sheet 3. Therefore, the scattering of the external light D on the observer side surface of the diffusing member 4 can be prevented to the maximum without preventing the light from being emitted from the projection device, and the black paint is applied to the diffusing member 4 by the printing method. Therefore, it can be easily manufactured, and the manufacturing cost can be reduced.

  FIG. 4 is a partial cross-sectional view of a screen according to the second embodiment of the present invention. In the following description of the invention, the same elements and functions of the screen and the image display apparatus according to the above-described embodiments will be described with the description thereof being simplified or omitted, and different points will be mainly described.

  As shown in FIG. 4, the diffusing member 14 is stacked in the first region A on the side of the observer of the lenticular sheet 3 and is not stacked in the second region B. For example, a region of the diffusing member corresponding to a range that moves up and down around the central portion of each cylindrical lens of the lenticular sheet 3 is a first region A, and a region through which the light beam condensed by the cylindrical lens portion 3a passes. It has become.

  On the other hand, the black stripe 15 is laminated on the region of the observer side surface of the lenticular sheet 3 corresponding to the second region B, and is not laminated on the first region A. That is, the diffusing member 14 is provided only between the black stripes 15 so as to fill the space between them.

  As a method for manufacturing the diffusing member, for example, there is a method of printing from the top of the black stripe 15 so that a paint having a high transmittance and a scattering characteristic is formed in the second region B by a printing method.

  The operation of the light of the image display device and the screen excluding the screen 1 is substantially the same as that of the first embodiment, and the description thereof is omitted.

  As described above, according to the present embodiment, since the plurality of black stripes 15 are laminated on the viewer side surface of the lenticular sheet 3, the diffusion member 14 exists between the lenticular sheet 3 and the black stripe 15. Without reducing the thickness of the entire screen.

  Further, since the diffusing member 14 is provided only between the black stripes, all the light passing through the lenticular sheet 3 passes through the diffusing member 14 and can be diffused in the horizontal direction. Thus, the scattering with respect to the external light D occurs only in the diffusing member 14, and the light striking the black stripe 15 other than the diffusing member is absorbed, so that the black float is reduced by the area ratio of the black stripe 15.

  Further, since the light passing through the diffusing member 14 is not absorbed as when passing through the ND filter, there is no decrease in white brightness, and higher contrast and higher brightness characteristics can be obtained.

  FIG. 5 is a partial cross-sectional view of a screen according to the third embodiment of the present invention.

  As shown in FIG. 5, the diffusing member 24 is formed on the surface of the transparent base material 26 laminated on the region of the observer side surface of the lenticular sheet 3 corresponding to the first region A. Are not stacked. For example, a region corresponding to a range that goes up and down around the central portion of each cylindrical lens of the lenticular sheet 3 is a first region A, and a region where light collected by the cylindrical lens portion 3a just travels. Yes.

  On the other hand, the black stripes 25 are stacked in the second region B on the viewer side of the lenticular sheet 3 and are not stacked in the first region A. That is, the transparent base material 26 is provided only between the black stripes 25 so as to be filled between them.

  In addition, as a manufacturing method of the diffusing member, for example, a transparent base material 26 is first made with a transparent resin between black stripes by a printing method, and the transparent base material 26 thus made is frosted by a sandblast method. And the like.

  The operation of the light of the image display device and the screen excluding the screen 1 is substantially the same as that of the first embodiment, and the description thereof is omitted.

  As described above, according to the present embodiment, the transparent base material 26 is further provided between the black stripes, and the diffusing member 24 is formed on the observer side surface of the transparent base material 26. The diffusing member 24 can be formed by subjecting the transparent base material 26 formed therebetween to a frosting process by a sandblasting method, which facilitates manufacture.

  FIG. 6 is a perspective view of an image display apparatus according to the fourth embodiment of the present invention, and FIG. 7 is an explanatory diagram for explaining image display of the image display apparatus. In the present embodiment, a rear projector type stereoscopic image display device will be described as an image display device. 7A is a diagram of the image display device viewed from above, and FIG. 7B is an explanatory diagram of a composite image when the screen is viewed from the viewer side.

  For example, as shown in FIG. 6, the image display device 100 that is a rear projector type stereoscopic display device includes a plurality of projection devices 151, a substrate 152 that sends a video signal to each of the projection devices 151, and a projection light emission surface of the projection device 151. And a base 153 that supports the projection device 151, the screen 1, and the like.

  Here, each projection device 151 is arranged and held on a projector base 154 as shown in FIG. 6, for example, and includes a light source (not shown) and a one-dimensional spatial light modulation unit, and a video signal sent from the substrate 152. The image light corresponding to is projected. In addition, the projection devices 151 are arranged in parallel with their projection light exit surfaces aligned on a substantially flat surface.

  The screen 1 is fixed to the base 153 via a screen frame 155 as shown in FIG. 6 so as to face the emission surface of each projection device 151 in parallel, and the hologram diffusion sheet 104 is used as a diffusion member. Yes. For example, the image light emitted from the viewer side of the screen 1 has a diffusion angle of several tens of degrees, preferably about 60 degrees in the vertical direction (Y-axis direction in FIG. 6), and the horizontal direction (X-axis direction in FIG. 6). The hologram diffusion sheet 104 is designed to have a diffusion angle of 0.1 degrees to 2 degrees, preferably 0.5 degrees to 2 degrees, and more preferably about 1 degree.

  This is to prevent the image light from the adjacent projection device from partially overlapping when the horizontal diffusion angle is greater than 2 degrees, and the combined image from becoming blurred as a whole. . Further, if the horizontal diffusion angle is smaller than 0.1 degree, a gap is generated between the image light from the adjacent projection apparatus and vertical stripes are not conspicuous on the combined screen.

  Further, for example, as shown in FIG. 6, a mirror 156 is provided on the side between the screen 1 and the projector base 154 that holds the plurality of projection devices 151, and the screen 1 out of the projection light from the projection device 151. Projection light not incident on the screen can be reflected and projected to the screen side.

  The operation of the image display apparatus 100 configured as described above will be described focusing on how light travels.

  First, in principle, in a stereoscopic image display device, a plurality of projection devices (projectors) are arranged at the rear of the screen in order to put corresponding parallax information for the left and right eyes of an observer, and a screen diffusion plate is provided. By setting the diffusion only in the vertical direction and hardly in the horizontal direction, different image information can be input to the left and right eyes.

  At this time, since the information of one projection apparatus is diffused only in the vertical direction by the diffusion anisotropic diffusion plate, the left and right eyes can be seen as a vertical line display. In the adjacent display line, since the display information from the adjacent projection device enters the eye, necessary information enters each eye from the plurality of projection devices.

  As a result, the image on the screen that can be seen by the left and right eyes can be seen as a composite image of vertical line display by each projection device.

  This will be specifically described below. For example, as shown in FIG. 7A, light beams emitted from the projection devices 151d among the projection devices 151a to 151k arranged in the horizontal direction are incident on the Fresnel lens sheet 2 of the screen 1 and converted into substantially parallel light beams. The Fresnel lens sheet 2 exits and enters the lenticular sheet 3.

  Here, the parallel rays incident on the lenticular sheet 3 are refracted and diffused in the vertical direction (Y-axis direction in FIG. 7) by the cylindrical lens portion 3a, and then travel through the first region A where the refracted rays travel. Including the hologram diffusion sheet 104 as a diffusion member provided on the observer side of the lenticular sheet 3. Then, it is slightly diffused in the horizontal direction (X-axis direction in FIG. 7) from the hologram diffusion sheet 104. For example, the light beam (image light) emitted from the hologram diffusion sheet 104 has a diffusion angle of several tens of degrees in the vertical direction, preferably 60 degrees, and is 0.1 degrees or more and 2 degrees or less, preferably 0.5 degrees in the horizontal direction. The above results in a diffusion angle of 2 degrees or less, more preferably about 1 degree.

  For example, as shown in FIG. 7A, the image light E passing between the black stripes 5 above and below (in the Y-axis direction in FIG. 7A) is three-dimensionally applied to the left and right eyes 157 of the observer. Of the composite image F that is one of the image information constituting the image, a part of the image information divided in the vertical direction is displayed.

  At this time, as described above, the screen 1 is configured to have a large diffusion angle in the vertical direction and a small diffusion angle in the horizontal direction, so that information from one projection device 151d is in the horizontal direction. Only by minute diffusion, it is visible to the observer as a vertical line display, for example, a vertical line display F4 in FIG. 7B.

  Moreover, since the vertical line display F5 which is the display information from the projection apparatus 151e adjacent to the projection apparatus 151d enters the observer's eyes on the adjacent display line, necessary information from each of the plurality of projection apparatuses 151 is received by the eyes. The image on the screen 1 observed by the left and right eyes is composed of a composite image of vertical line display by each projection device, for example, a plurality of strip-shaped vertical line displays shown in FIG. It will appear as a composite image F.

  On the other hand, as shown in FIG. 1, most of the external light D is absorbed by the black stripe 5 provided on the viewer side of the screen 1.

  When there is almost no diffusion angle in the horizontal direction of the diffusing member, a vertical stripe is conspicuous because a gap is generated between the vertical lines displayed by each projection device. In this embodiment, the hologram diffusion sheet 104 is used. Since the horizontal diffusion angle is set to about 1 degree, the gap between the vertical lines can be filled.

  As described above, according to the present embodiment, the image display device 100 has the screen 1 divided into the first region A in which the light refracted by the lenticular sheet 3 travels and the second region B in which the refracted light does not travel. The black stripes 5 are provided on the outermost surface on the viewer side in the second region B. Therefore, since the surface to which the external light D hits can be covered with the black stripe 5 as much as possible without disturbing the emission of light from each projection device 151, the external light is absorbed, scattering is suppressed to the maximum, and an image with little black floating is obtained. The display device 100 can be obtained.

  Further, since it is not necessary to give the ND filter effect to the hologram diffusion sheet itself, it is possible to prevent the brightness of white from being lowered, and the image display device 100 with high contrast can be obtained.

  Furthermore, the hologram diffusion sheet 104 includes the second region B and is laminated on the viewer side of the lenticular sheet 3, and the plurality of black stripes 5 are provided on the viewer side of the hologram diffusion sheet 104. Therefore, the black stripe 5 can be easily manufactured by applying black paint to the hologram diffusion sheet 104 by a printing method.

  In addition, since the hologram diffusion sheet 104 is formed in a relatively large area, a special sheet such as a hologram diffusion sheet can be accurately manufactured.

  Furthermore, since the diffusion member is a hologram diffusion sheet, it is possible to control diffusion more freely than a normal diffusion member, and it is possible to create a screen having diffusion characteristics with a higher degree of freedom. . For example, when the screen 1 having the lenticular sheet 3 and the diffusing member 4 diffusing in the same direction is used in the stereoscopic image display device, it is difficult to adjust the diffusivity in the horizontal direction, and the composite image F of a plurality of vertical line displays is partially obtained. As a result, the three-dimensional images are blurred. Further, if the diffusing member 4 is not used, a gap is generated between the vertical lines, resulting in a stereoscopic image in which the vertical stripes are conspicuous. Therefore, by using the hologram diffusion sheet 104 as the diffusion member and setting the horizontal diffusion degree to 0.1 degrees or more and 2 degrees or less, for example, it is possible to use the stereoscopic image display device without being blurred. It is possible to obtain a stereoscopic image in which vertical stripes are not conspicuous.

  Furthermore, the diffusing member is manufactured by mixing a diffusing material such as an inorganic compound in a transparent resin, for example. However, in such a method, it is not possible to have diffusion anisotropy where the diffusing angles in the vertical direction and the horizontal direction are significantly different. Have difficulty. In that respect, the hologram diffusion sheet 104 can be manufactured so as to have diffusion anisotropy relatively easily.

  The present invention has been described above with reference to preferred embodiments. However, the present invention is not limited to any of the above-described embodiments, and various modifications may be made as appropriate within the scope of the technical idea of the present invention. It can be implemented in combination.

It is a perspective view of the screen concerning a 1st embodiment. It is explanatory drawing explaining how the light of the screen which concerns on 1st Embodiment advances. It is explanatory drawing of the image display apparatus which concerns on 1st Embodiment. It is a fragmentary sectional view of the screen concerning a 2nd embodiment. It is a fragmentary sectional view of the screen concerning a 3rd embodiment. It is a perspective view of the image display apparatus which concerns on 4th Embodiment. It is explanatory drawing explaining an image display.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Screen 2 ... Fresnel lens sheet 3 ... Lenticular sheet 4, 14, 24 ... Diffusion member 5, 15, 25 ... Black stripe 26 ... Transparent base material 50, 100 ... Image display apparatus 104 ... Hologram diffusion sheet 51, 151 ... Projection Device A ... first area B ... second area

Claims (8)

In the screen that projects the light from the projection device to the opposite side of the observer and projects it,
An optical member that converts the light into substantially parallel light;
A lenticular sheet that refracts the substantially parallel light in a direction perpendicular to the direction of the light;
A diffusing member that is provided in at least a first region where light refracted in the vertical direction travels and diffuses the refracted light in a horizontal direction perpendicular to at least the vertical direction;
And a plurality of black stripes provided on the outermost surface side on the viewer side in the second region where the refracted light does not travel. The screen according to claim 1,
The diffusion member includes the second region, and is laminated on the observer side surface of the lenticular sheet, and the plurality of black stripes are provided on the observer side surface of the diffusion member. Screen to play. The screen according to claim 2,
The screen, wherein the diffusion member is a hologram diffusion sheet. The screen according to claim 3,
The horizontal diffusion angle of the hologram diffusion sheet is not less than 0.1 degrees and not more than 2 degrees. The screen according to claim 1,
The screen, wherein the plurality of black stripes are stacked on the viewer side of the lenticular sheet. The screen according to claim 5,
The screen, wherein the diffusing member is provided only between the black stripes. The screen according to claim 5,
Further comprising a transparent substrate between the black stripes,
The screen, wherein the diffusing member is formed on a side of the observer of the transparent substrate. In an image display device that has a projection device in which light from a light source is modulated and emitted by a spatial light modulator, and projects the light from the projection device on the opposite side of the screen from an observer, and displays an image.
The screen is
An optical member that converts the light into substantially parallel light;
A lenticular sheet that refracts the substantially parallel light in a direction perpendicular to the direction of the light;
A diffusing member that is provided in at least a first region where light refracted in the vertical direction travels and diffuses the refracted light in a horizontal direction perpendicular to at least the vertical direction;
An image display device comprising: a plurality of black stripes provided on the outermost surface side on the viewer side in the second region where the refracted light does not travel.

Images