JP2009168871A - Screen device and projection display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen device whose video display surface is flat, and a projection display device. <P>SOLUTION: The screen device 1 includes a supporting substrate 11 having translucency, a lens sheet 10 arranged in a video display area provided in the center part of the supporting substrate 11, and a light shielding mask 12 provided in such a state that it covers over the periphery of the video display area on the supporting substrate 11. In the screen device 1, a supporting member for attaching a cover to a part in which the light shielding mask 12 is provided on the supporting substrate 11. The lens sheet 10 is composed by superposing at least a Fresnel lens 10a and a lenticular lens 10b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a screen device that projects an image from the back and displays the image on the front surface side, and a projection display device using the screen device.

  2. Description of the Related Art In recent years, development of a rear projection device (projection display device) that projects an image from the back of a screen as a large display device has been actively performed. The rear projection apparatus enlarges image light obtained by modulating an image signal by an LCD or the like using an enlargement optical system, projects the image light from the back surface of the screen device, and projects it on the front surface side.

  The rear projection apparatus is suitable for an apparatus that displays a large image because it magnifies and projects video light, and is mainly commercialized as one of large television apparatuses.

  Here, the screen device used in the projection display device has a flat Fresnel lens and a lenticular lens from the viewpoint of finely transmitting an image projected from the back to the front. The Fresnel lens is a lens in which minute prisms are arranged in a concentric pattern, and has a function of collimating image light incident radially from a mirror. The lenticular lens has a function of widening the viewing angle by deflecting incident light.

  In the projection display device, in order to hold the screen device having such two flat lenses in the housing, the screen device is arranged on the back side of the front frame portion (bezel) of the housing, and is attached by a metal fitting or the like. It has a structure of pressing and fixing (for example, see Patent Document 1).

  11 and 12 are diagrams for explaining a holding structure of a screen device in a conventional projection display device, in which FIG. 11A is a front view of the projection display device, and FIG. 11B is a line arrow of FIG. FIG. 12 is an enlarged sectional view of the holding portion. As shown in FIG. 11, the projection type display device has a structure in which the back surface is covered with a back cover 21 in a state where a lens sheet 10 (a superposition of a Fresnel lens 10 a and a lenticular lens 10 b) is attached to a housing 20. It has become.

  As shown in FIG. 12, the conventional screen holding structure uses a bezel 20a, a lens sheet 10, and a screen holder H which are frame portions of the housing 20, and the lens sheet 10 is attached to the back surface of the bezel 20a by the screen holder H. It has a structure to hold down. A boss B is provided outside the lens sheet 10 on the back surface of the bezel 20a. By screwing the screen holder H to the boss B, the edge of the lens sheet 10 is held by the screen holder H, and the bezel 20a is connected to the bezel 20a. It is structured to be sandwiched between them.

JP 11-242293 A

  However, in such a conventional projection display device, the screen device and the bezel are separate components, and it is necessary to support the lens sheet so as to be sandwiched from the outside by the bezel and the screen holder. That is, in order to cope with the dimensional tolerance, temperature change, and dimensional change due to water absorption of the lens sheet, it is necessary to provide a predetermined margin when the lens sheet is held by the bezel and the screen holder. For this reason, the bezel protrudes outside the periphery of the screen device, which is a problem in reducing the size of the casing of the projection display device. Further, since the bezel protrudes from the surface on which the image is displayed, there is a problem that a flat image display surface cannot be realized and the design is restricted.

  The present invention has been made to solve such problems. That is, the present invention provides a translucent support substrate, a lens sheet disposed in an image display area provided in the center of the support substrate, and a light-shielding mask provided so as to cover the periphery of the image display area on the support substrate. Is a screen device. Moreover, in the screen apparatus of this invention, the supporting member for attaching a cover to the part in which the light shielding mask in a support substrate is provided is attached. Further, the lens sheet is composed of at least a Fresnel lens and a lenticular lens superimposed.

  In the present invention, the light shielding mask is provided so as to cover the periphery of the support substrate that fixes the lens sheet, and this light shielding mask serves as a bezel. For this reason, a support member is provided in the portion of the light shielding mask, and the cover is attached via the support member, so that the cover can be attached to the inside of the support substrate, and nothing is provided on the outside of the support substrate that is the image display surface. There is no projecting thing.

  The present invention also provides a screen device on which an image is projected from the back surface, a cover attached to the back surface with the screen device as a front surface, and an image that is provided inside the cover and generates an image to be projected toward the back surface of the screen device. A projection-type display device including a forming unit, and as the screen device, a translucent support substrate, a lens sheet disposed in an image display region provided in a central portion of the support substrate, and an image display on the support substrate A light shielding mask provided in a state of covering the periphery of the region. In the projection display device of the present invention, a support member for attaching a cover is attached to a portion of the support substrate of the screen device where the light shielding mask is provided. Further, the cover is housed inside the outer shape of the support substrate. The lens sheet is composed of at least a Fresnel lens and a lenticular lens superimposed.

  In the present invention, the light shielding mask is provided so as to cover the periphery of the support substrate that fixes the lens sheet in the screen device, and this light shielding mask serves as a bezel. For this reason, a support member is provided in the portion of the light shielding mask, and the cover is attached via the support member, so that the cover can be attached to the inside of the support substrate, and nothing is provided on the outside of the support substrate that is the image display surface. There is no projecting thing.

  The present invention has the following effects. That is, the bezel does not protrude outside the support substrate, and the size of the casing of the projection display device can be reduced. Further, there is no step on the video display surface, and a flat display surface design can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Screen device>
FIG. 1 is a schematic perspective view illustrating a screen device according to the present embodiment. That is, the screen device 1 according to the present embodiment projects an image projected from the back side to the front side, and is disposed in a translucent support substrate 11 and an image display area provided in the central portion of the support substrate 11. And a light shielding mask 12 provided so as to cover the periphery of the video display area on the support substrate 11.

  The support substrate 11 serves as a support for attaching the lens sheet 10 to the back side, and is a resin such as polycarbonate or acrylic, and uses a flat substrate having excellent translucency. A glass plate may be used instead of the resin. When the resin support substrate 11 is used, the thickness is, for example, 3 mm to 5 mm, and the size is larger than the maximum size (maximum screen size) for projecting an image.

  The lens sheet 10 is a laminate of at least two plate-like optical sheets. As two optical sheets, a Fresnel lens 10a and a lenticular lens 10b are arranged from the back side (the side on which the image is projected). It has a configuration in which they are laminated together.

  Of the two optical sheets, the Fresnel lens 10a is a lens in which minute prisms are arranged in a concentric pattern, and has a function of collimating image light incident radially from a mirror. Of the two optical sheets, the lenticular lens 10b has a function of widening the viewing angle by deflecting incident light. These optical sheets are formed of a resin such as acrylic or polycarbonate, and are bonded together with an adhesive.

  The Fresnel lens 10a and the lenticular lens 10b have a rectangular shape corresponding to a horizontal / vertical ratio such as 4: 3 or 16: 9, which is the size of the image, and are provided on the back side and the center of the support substrate 11 described above. Attached with an adhesive or the like corresponding to the video display area.

  The light shielding mask 12 is provided on the back side of the support substrate 11 so as to cover the periphery of the video display area, for example, by black printing. Thereby, on the back side of the support substrate 11, the lens sheet 10 composed of the Fresnel lens 10 a and the lenticular lens 10 b is attached corresponding to the central image display region, and from the outside of the lens sheet 10 to the edge of the support substrate 11. It will be in the state covered with the light shielding mask 12. On the other hand, nothing is provided on the front side of the support substrate 11 (the side on which the image is projected), and a flat display surface is obtained. Note that a hard coat may be formed on the entire front surface of the support substrate 11 from the viewpoint of preventing scratches.

  FIG. 2 is a schematic cross-sectional view of the screen device according to the present embodiment, showing a cross section taken along line AA shown in FIG. In FIG. 2, the upper side in the figure is the back side, and the lower side in the figure is the front side. A lens sheet 10 formed by superposing a Fresnel lens 10a and a lenticular lens 10b is attached to a video display region which is a back side and a central portion of the support substrate 11 having translucency. On the other hand, a light shielding mask 12 is provided in a state surrounding the lens sheet 10 around the video display area on the back side of the support substrate 11, that is, around the lens sheet 10. The light shielding mask 12 and the lens sheet 10 may have a slight overlap. Thereby, it is possible to prevent a gap from being generated between the lens sheet 10 and the light shielding mask 12.

  In the screen device 1 of the present embodiment, the lens sheet 10 and the light shielding mask 12 are provided on the back side of the support substrate 11, while nothing is provided on the front side of the support substrate 11, and a flat image display is performed. A surface can be realized.

  Here, in this embodiment, although it distribute | circulates in the state of the screen apparatus 1 shown in FIG. 1 and FIG. 2, you may comprise the screen apparatus 1 in the state which attached the supporting member which attaches a back cover. FIG. 3 is a schematic cross-sectional view illustrating attachment of the support member. Also in this figure, like FIG. 2, the upper side in the figure is the back side, and the lower side in the figure is the front side. As described above, in the screen device 1, the lens sheet 10 is attached to the back side of the translucent support substrate 11, and the light shielding mask 12 is provided around the lens sheet 10. In the example shown in FIG. 3, a support member 15 for attaching the back cover is provided at the position of the light shielding mask 12.

  In general, the back cover has a structure that is attached to a bezel that is a frame portion of the casing. However, in the screen device 1 of the present embodiment, the bezel is not provided outside the lens sheet 10, and therefore, the support cover 11 is attached to the support substrate 11. It is necessary to install. Therefore, a support member 15 is attached to the portion of the light shielding mask 12 of the support substrate 11, and a back cover is attached via the support member 15.

  The support member 15 is formed of, for example, a metal made of aluminum or a resin having a predetermined strength, and has a shape including a connection surface with the support substrate 11 and a mounting portion of the back cover. The support member 15 is attached to the part of the light shielding mask 12 of the support substrate 11 with an adhesive, for example. When the support member 15 is attached to the portion of the light shielding mask 12 with an adhesive, it is desirable to use a material having good light shielding properties and familiarity with the adhesive. Further, unevenness may be provided in a portion where the support member 15 abuts, and the adhesion area by the adhesive may be increased to increase the adhesive strength.

  The shape of the support member 15 shown in FIG. 3 may be a shape other than this as an example. Moreover, although what used the support member 15 as another component was demonstrated, what was integrated with the support substrate 11 may be sufficient. For example, a convex portion or a concave portion may be provided in the back cover attaching portion of the support substrate 11 and the rear cover may be engaged therewith.

<Screen device manufacturing method>
4-6 is a figure explaining the manufacturing method of the screen apparatus based on this embodiment. First, as shown in FIG. 4A, a flat support substrate 11 having excellent translucency is prepared. For example, a resin such as polycarbonate or acrylic having a thickness of 3 mm to 5 mm and a size slightly larger than the maximum size for projecting an image is used. Then, on the back surface side of the support substrate 11, the light shielding mask 12 is formed so as to cover the periphery except for the video display area in the center. The light shielding mask 12 is applied with, for example, black ink having a light shielding property by a method such as screen printing. The width of the light shielding mask 12 is, for example, about 20 mm to 30 mm.

  Next, as shown in FIG. 4B, a lenticular lens 10b is attached to the image display area in the center of the support substrate 11 on which the light shielding mask 12 is formed. The lenticular lens 10b is pasted with a slight overlap with the light shielding mask 12. Here, they are pasted with an overlap of about 5 mm. FIG. 4C is an enlarged cross-sectional view of an overlap portion between the lenticular lens and the light shielding mask. The lenticular lens 10b is attached so as to overlap with a part of the inner portion of the printing area of the light shielding mask 12. The amount of overlap (overlap) is set to such an extent that no gap is generated between the light shielding mask 12 and the tolerance of the lenticular lens 10b and the positioning accuracy are taken into consideration.

  Next, as shown in FIG. 5A, the Fresnel lens 10a is laminated and pasted on the lenticular lens 10b on the back surface of the support substrate 11 is pasted. FIG. 5B is an enlarged cross-sectional view of a portion where the Fresnel lens is attached. The Fresnel lens 10a has a slightly larger size than the previously attached lenticular lens 10b, and is attached so as to completely cover the lenticular lens 10b. Therefore, the Fresnel lens 10a also partially overlaps the light shielding mask 12 and is attached without a gap.

  Here, in the type in which the support member is not attached or the type in which the support member is integrated with the support substrate 11, the screen device of the present embodiment is completed through the steps so far. On the other hand, in the type which attaches a supporting member, it carries out to the next process.

  That is, in the type in which the support member is attached, the support member 15 is attached to the portion of the light shielding mask 12 in the support substrate 11 as shown in FIG. The support member 15 is formed by molding a metal made of aluminum, for example, and is fixed to the portion of the light shielding mask 12 with an adhesive or a double-sided adhesive tape. The support member 15 is attached so that it does not extend outward from the region of the light shielding mask 12 and does not cover the inner lens sheet 10. Thereby, a screen apparatus provided with a supporting member is completed.

  In addition, although not in the manufacturing process demonstrated above, you may give a hard coat to the front side of the support substrate 11 as needed. Thereby, it becomes possible to suppress the adhesion and scratches on the front side of the support substrate 11 exposed when the display device is set.

<Projection type display device>
FIG. 7 is a schematic perspective view illustrating the projection display device according to the present embodiment. The projection display device 100 is configured by forming the housing 20 with the screen device 1 as a front surface and providing a back cover 21 on the rear surface side, and projects images toward the back of the screen device 1 inside the housing 20. It has a configuration including a video projection device (not shown).

  As the screen device 1 of the projection display device 100, the screen device 1 of the present embodiment described above is used. That is, the screen device 1 includes a support substrate 11 having translucency, a lens sheet 10 disposed in a video display area provided in the center portion on the back side of the support substrate 11, and a back side of the support substrate 11. And a light shielding mask 12 provided to cover the periphery of the video display area.

  In the projection display device 100 of the present embodiment, the screen device 1 is disposed on the front surface of the device, but only the front surface of the support substrate 11 is exposed on the front surface side of the screen device 1, and the lens on the back surface side. The sheet 10 and the light shielding mask 12 are hidden in the housing 20 so that they cannot be seen. Further, the back cover 21 attached to the back side of the screen device 1 is attached so as to fit inside the outer shape of the support substrate 11 of the screen device 1, and the back cover 21 protrudes outside the outer shape of the screen device 1. It has no structure.

  FIG. 8 is an enlarged cross-sectional view for explaining a mounting portion between the screen device and the back cover. A support member 15 for attaching a back cover 21 is provided on a portion of the light shielding mask 12 on the back side of the support substrate 11 of the screen device 1. The support member 15 is provided at a position spaced apart from the connection portion 15a by a connection portion 15a that contacts the light shielding mask 12, a convex portion 15b that rises from the connection portion 15a, and the connection portion 15a. And a mounting portion 15c.

  The connection portion 15 a of the support member 15 is attached at a position shifted from the end of the support substrate 11 inward by the thickness of the back cover 21. Further, the attachment portion 15c is provided with a screw hole for fixing the bolt B.

  The entire support member 15 is disposed inside the area of the light shielding mask 12 and in a range that does not cover the lens sheet 10 including the Fresnel lens 10a and the lenticular lens 10b. By arranging the support member 15 inside the area of the light shielding mask 12, it is possible to reduce the size of the back cover 21 attached thereto so as not to protrude outward from the support substrate 11, and to arrange the support member 15 at a position that does not cover the lens sheet 10. The interference between the support member 15 and the optical path of the projected image can be avoided.

  The back cover 21 includes a contact end 21 a with the support substrate 11, a mounting claw 21 b provided inside the contact end 21 a, and a fastening portion 21 c for fastening the support member 15. In order to attach the back cover 21, it arrange | positions so that the convex part 15a of the support member 15 may be fitted between the contact edge 21a and the attachment nail | claw 21b. When the contact end 21a of the back cover 21 hits the back surface of the support substrate 11 by this fitting, the back cover 21 is positioned there. The attachment claw 21b may be integrally formed with the back cover 21, but a leaf spring may be attached as a separate part. The back cover 21 is reliably fitted by the spring property of the mounting claw 21b.

  When the back cover 21 is fitted, the fastening portion 21 c of the back cover 21 is overlapped with the mounting portion 15 c of the support member 15. The fastening portion 21c is provided with a hole, and this hole and the screw hole of the attachment portion 15c overlap each other, so that the fastening portion 21c can be fixed to the attachment portion 15c with the bolt B. By fastening with the bolt B, the back cover 21 is securely fixed to the screen device 1 via the support member 15. The fastening portion 21c and the attachment portion 15c may be fastened by fastening means other than the bolt B.

  When the back cover 21 is attached in this way, the support member 15 is attached while being shifted inward by the thickness of the back cover 21, so that the outline line of the back cover 21 coincides with the end of the screen device 1. Thus, the housing 20 does not protrude outside the screen device 1, and the entire device can be reduced in size and an integrated design can be obtained.

  FIG. 9 is a diagram illustrating the internal configuration of the projection display apparatus according to the present embodiment. The screen device 1 is located on the front surface of the housing 20 and displays an image projected from the back surface. The casing 20 constituted by the support substrate 11 and the back case 21 of the screen device 1 is provided with a space for arranging a predetermined member therein. Inside the housing 20, a video projection device 30 is disposed below, and a rear mirror 31 is disposed at a predetermined angle on the rear case 21 side.

  The video projection device 30 includes, for example, a liquid crystal element, an optical unit such as a prism, an optical unit configured by a magnifying lens system, and a light source. When displaying an image, the light emitted from the light source is sent to the optical unit, this light is modulated as an image by the liquid crystal element, and sent to the rear mirror 31 side by the magnifying lens system. Then, the video is reflected by the rear mirror 31 to the screen device 1 side, and the video is projected onto the screen body 10 from the rear side.

  In the projection display device 100, from the viewpoint of shortening the depth of the housing 20 while ensuring an enlarged optical path length of the projection image, the video projection device 30 is disposed below the housing 20, and the image is directed upward from here. Is emitted. Then, this is reflected by the rear mirror 31 to the screen device 1 side, and an image is projected from the rear side of the lens sheet 10.

  The lens sheet 10 of the screen device 1 is in a state where the Fresnel lens 10a and the lenticular lens 10b are bonded in this order from the back side, and the image reflected by the back mirror 31 is collimated by the Fresnel lens 10a, Project a wide viewing angle.

  In such a projection display device 100, by using the screen device 1 of the present embodiment, the back cover 21 can be attached at the portion of the back light shielding mask 12 on the support substrate 11 of the screen device 1. Only the surface of the support substrate 11 is exposed on the front surface where the image display of the apparatus 100 is performed, and a flat design without a bezel or the like can be realized. Moreover, since there is nothing which protrudes outside the support substrate 11, the housing | casing 20 of the projection type display apparatus 100 can be reduced in size.

<Explanation of usage>
FIGS. 10A and 10B are front views for explaining a usage state in the projection display device of the present embodiment, in which FIG. 10A shows a state where no video is displayed, and FIG. 10B shows a state where a video is displayed. In the projection display device 1 of the present embodiment, the screen device 1 of the present embodiment is arranged on the front surface of the housing 20. As described above, the screen device 1 according to the present embodiment has a flat shape in which no protrusion is present on the front surface side of the support substrate 11. Further, since a back cover (not shown) is attached to the back side of the screen device 1, the back cover does not protrude outside the outer shape of the screen device 1. Therefore, the flat screen device 1 as a whole in the projection display device 100 is largely arranged on the front surface.

  As shown in FIG. 10A, in a state where no video is displayed, the screen device 1 is configured in a flat design like a single plate on the front surface of the projection display device 100. At this time, although the support substrate 11 of the screen device 1 has translucency, in the state in which no image is displayed, the center image display area has almost no light leaked from the inside due to the black stripes of the lens sheet, etc. The entire surface appears to be uniform black with the light shielding mask 12 in the peripheral portion.

  As shown in FIG. 10B, in the state where the image is displayed, the image is projected onto the image display area (the area inside the light shielding mask 12) in the screen device 1 on the front surface of the projection display device 100. Since the screen device 1 has a flat design with no bezel on the front surface, the image is displayed in such a state as to emerge from this surface.

<Effect of embodiment>
In the screen device 1 according to the present embodiment, since there is no protruding portion such as a bezel on the front surface, a flat design of the display surface can be realized. Further, since the bezel is not used, the thickness (depth) around the screen can be reduced to about 10 mm or less. Further, by reducing the number of parts, improving the workability, and printing the light shielding mask 12 on the back side of the support substrate 11, the boundary between the image display area and the light shielding mask 12 when no image is projected is provided. It is difficult to see, and a flat panel design with a uniform color is realized when the image is not displayed, such as when the power is turned off. When the image is displayed such as when the power is turned on, the projected image appears from the front panel. It is possible to perform an upward display.

<Application example>
In this embodiment, since a bezel surrounding the outside of the screen device 1 is not required, various shapes can be easily configured as the support substrate 11 of the screen device 1. That is, in addition to the above-described rectangle, a circle, an ellipse, a polygon other than a rectangle, or a free curve can be used, and various design requirements can be met. Further, the surface shape of the support substrate 11 may be a curved shape in addition to a flat surface.

  In the above embodiment, the example in which the light shielding mask 12 is provided on the back side of the support substrate 11 has been described. However, the light shielding mask 12 may be provided on the front side of the support substrate 11. Since the light shielding mask 12 can be thinly formed by printing, even if it is provided on the front surface side of the support substrate 11, the flatness of the front surface of the panel is not greatly affected.

It is a model perspective view explaining the screen apparatus which concerns on this embodiment. It is a schematic cross section of the screen device concerning this embodiment, and shows the AA line section shown in FIG. It is a schematic cross section explaining attachment of a support member. It is FIG. (1) explaining the manufacturing method of the screen apparatus which concerns on this embodiment. It is FIG. (2) explaining the manufacturing method of the screen apparatus which concerns on this embodiment. It is FIG. (3) explaining the manufacturing method of the screen apparatus which concerns on this embodiment. It is a model perspective view explaining the projection type display apparatus concerning this embodiment. It is an expanded sectional view explaining the attachment part of a screen apparatus and a back cover. It is a figure explaining the internal structure of the projection type display apparatus which concerns on this embodiment. It is a front view explaining the use condition in the projection type display apparatus of this embodiment. It is FIG. (1) explaining the holding structure of the screen apparatus in the conventional projection type display apparatus. It is FIG. (2) explaining the holding structure of the screen apparatus in the conventional projection type display apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Screen apparatus, 10 ... Lens sheet, 10a ... Fresnel lens, 10b ... Lenticular lens, 11 ... Support substrate, 12 ... Shading mask, 15 ... Support member, 20 ... Housing, 21 ... Back cover, 100 ... Projection type display apparatus

Claims (7)

A support substrate having translucency;
A lens sheet disposed in a video display area provided in the center of the support substrate;
A screen device comprising: a light shielding mask provided in a state of covering a periphery of an image display area on the support substrate. The screen device according to claim 1, wherein a support member for attaching a cover is provided on a portion of the support substrate where the light shielding mask is provided. The screen device according to claim 1, wherein the lens sheet is formed by superposing at least a Fresnel lens and a lenticular lens. A screen device on which images are projected from the back;
A cover attached to the back surface with the screen device as the front surface;
In a projection type display device comprising an image forming unit that is provided inside the cover and generates an image projected toward the back surface of the screen device,
The screen device includes:
A support substrate having translucency;
A lens sheet disposed in a video display area provided in the center of the support substrate;
A projection-type display device comprising: a light-shielding mask provided in a state of covering the periphery of the image display area on the support substrate. The projection display device according to claim 4, wherein a support member is provided on a portion of the support substrate where the light shielding mask is provided, and the cover is attached via the support member. The projection display device according to claim 4, wherein the cover is accommodated inside the outer shape of the support substrate. The projection display device according to claim 4, wherein the lens sheet is formed by superposing at least a Fresnel lens and a lenticular lens.

Images