JP2014130305A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of presenting a stereographic two-dimensional image rich in depth floating in a space at a distance from a device body.SOLUTION: A display device includes; a mounting table 1 having a mounting surface 1a; a light source 3 for irradiating a sheet P on the mounting surface 1a with light; a panel-like imaging optical element (micro-mirror array 2); and a case 10 having a predetermined surface (top surface) fitted with the imaging optical element 2. The mounting surface 1a holds the sheet P at a predetermined tilt angle α with respect to an element surface H of the imaging optical element 2. The light projected from the light source 3 is reflected by a surface of the sheet P, transmits through the imaging optical element 2, and forms a projection image (I') of an image I on the sheet P, which floats above an outer surface (top surface 2a) of the panel-like imaging optical element 2.

Description

  The present invention relates to a display device that three-dimensionally displays an image having a sense of depth by projecting a two-dimensional image such as a photograph in a state where it appears in space.

  2. Description of the Related Art Conventionally, display devices for viewing images, such as a photo frame and a digital photo frame, have been used to allow a user to personally view a favorite photograph or image on a desk at home or at work. Some of these photo frames are intended to display these photographs in a three-dimensional (three-dimensional) manner by adding optical depth (depth) to a planar (two-dimensional) photograph. Has been proposed (see Patent Documents 1 and 2).

  For example, according to “stereoscopic photo frame” of Patent Document 1, a back plate for pasting a photograph or the like is formed in a convex shape in which the center of the photograph bulges to the front (front) side, so that the above photograph or the like A stereoscopic effect (perspective) can be imparted to.

  Also, according to “stereoscopic photo frame with lens” of Patent Document 2, the above-mentioned planar photograph is provided by disposing a lens for enlarging a photograph or the like on the front (front side) side separated from the surface of the photograph or the like. Can be enjoyed as an enlarged photo with a deep stereoscopic effect.

Japanese Patent Laid-Open No. 9-23958 JP-A-7-204068

  However, each method of displaying a photograph or the like three-dimensionally in the above-mentioned photo frame has an insufficient depth feeling of the image, so that the stereoscopic effect is poor, and an image lacking impact compared to a three-dimensional image using binocular parallax or the like. End up. In addition, since an image such as a photo is viewed from the front of a photo stand or the like, there is a problem that a frame such as a photo stand or the like interferes with the viewer's field of view and it is difficult to obtain a three-dimensional effect or a sense of reality.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a display device capable of displaying a stereoscopic two-dimensional image rich in depth in a space away from the device body. To do.

  In order to achieve the above object, a display device of the present invention includes a mounting table having a mounting surface for mounting a sheet on which an image is printed, and a light source that irradiates light on the sheet on the mounting surface. A panel-shaped imaging optical element, a mounting table and a case for storing paper, and the imaging optical element is disposed on an upper surface of the case, and the imaging optical element is disposed below the imaging optical element. The above-mentioned mounting surface is arranged in a state inclined at a predetermined angle with respect to the lower surface of the imaging optical element, and the paper is reflected by the light projected from the light source and reflected by the surface of the paper and transmitted through the imaging optical element. The projection image of the upper image is formed in a state of being raised above the panel-shaped imaging optical element.

  That is, the present inventor has conducted extensive research to solve the above problems, and as a result, using the panel-like optical element having an imaging function, the above photograph is placed above a case or housing that accommodates a photograph or the like. The present invention finds that the above-mentioned photograph or the like can be displayed as a stereoscopic image (3D image) as an image full of realism by forming a two-dimensional image such as Reached.

  In the display device of the present invention, a mounting table having a mounting surface for mounting a sheet on which an image is printed is disposed in a state where the mounting surface is inclined at a predetermined angle, and corresponds to the mounting surface described above. After the light projected from the light source disposed in the case is reflected on the image of the paper, it is transmitted through the panel-shaped imaging optical element fitted on the upper surface of the case, and above (the panel A stereoscopic two-dimensional image is formed on the upper side of the outer surface. As a result, the display device of the present invention allows a planar two-dimensional image (on the placement surface) to be placed by a simple operation of placing a photograph or the like on the placement surface and turning on the light source. A photograph or the like) can be displayed (projected) as a pseudo three-dimensional image (stereoscopic two-dimensional image) having a sense of depth.

  The container for storing the paper on which the image is printed is a dark box shape that shields ambient light, and a case in which the mounting table and the light source are disposed therein, or a side surface is opened. Any one of housings that are open-type and in which the mounting table and the mounting surface are formed by using one surface thereof is suitably employed. When the dark box-like case is used, there is an advantage that the image can be projected clearly. Further, when the open housing is used, there is an advantage that the paper can be easily taken in and out.

  Among the display devices of the present invention, the display device in which the inclination angle of the mounting surface with respect to the element surface (lower surface of the panel) of the imaging optical element is set to 30 ° or more and less than 90 ° is the display device described above. The displayed stereoscopic two-dimensional image can be displayed as a stereoscopic image that feels more floating.

  Furthermore, among the display devices of the present invention, in particular, the display surface on which the paper is placed has a concave or convex shape curved with a predetermined radius of curvature. Can be displayed as a stereoscopic image with a deeper sense of depth.

  The “panel-shaped imaging optical element” in the display device of the present invention refers to a refractive imaging element (various lenses including a Fresnel lens and the like, an afocal optical system) that forms a mirror image of a projection object as a real image. Micro-mirrors, corner reflectors, etc.) and erecting equal-magnification imaging elements such as microlens arrays that form erecting equal-magnification images of projection objects as real images. And the front and back surfaces (upper and lower surfaces) are relatively flat and flat. The “element surface” of the panel-shaped imaging optical element refers to a “plane in the center of the imaging optical element in the thickness direction” serving as a reference for imaging (refractive point of the optical path). In the “imaging optical element”, the “element surface”, “outer surface” (upper surface), and “inner surface” (lower surface) are substantially parallel.

1 is an external perspective view of a display device according to a first embodiment of the present invention. It is a figure which shows the internal structure of the display apparatus in the said 1st Embodiment. It is a figure explaining the method to set a paper in the said display apparatus. (A) is a shape example of another mounting table in the display device, and (b) is a shape example of still another mounting table. It is a figure explaining the structure of the micromirror array used for the said display apparatus. It is sectional drawing explaining the detailed structure of the said micromirror array. It is a figure explaining the projection system of the aerial image by the said micromirror array. It is a figure which shows the internal structure of the display apparatus in 2nd Embodiment of this invention. It is a figure which shows the shape of the open-type housing used for the display apparatus of 3rd Embodiment of this invention. It is a figure which shows the shape of the open-type housing used for the display apparatus of 4th Embodiment of this invention. It is a figure which shows the internal structure of the display apparatus of 5th Embodiment of this invention. It is a figure which shows the structure of the display apparatus of 6th Embodiment of this invention. It is a figure explaining the other structural example of the micromirror array used for the display apparatus of this invention. It is a disassembled perspective view explaining the structure of the said micromirror array. It is a figure explaining the other structural example of the micromirror array used for the display apparatus of this invention. It is a disassembled perspective view explaining the structure of the said micromirror array. It is a figure explaining the other structural example of the micromirror array used for the display apparatus of this invention. It is a disassembled perspective view explaining the structure of the said micromirror array. It is a figure explaining the structure of the micromirror array of another structure used for the display apparatus of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to this embodiment.

  FIG. 1 is an external perspective view of a display device according to a first embodiment of the present invention, and FIG. 2 is a diagram for explaining the internal structure and the state of image projection. Note that the “image” (thick line arrow I in FIG. 2) printed on the surface of the paper P (such as photographic paper or photo) is shown with its thickness emphasized. In FIG. 2, reference numeral 1 b denotes a frame-like (frame-like) paper folder attached to the periphery of the mounting table 1, but may be omitted in other drawings.

  The display device according to the present embodiment includes a mounting table 1 for mounting the paper P on which the image I is printed (a photograph in this example), a light source 3 that irradiates the paper P on the mounting table 1 with light, A panel-like imaging optical element (2) having an imaging function and a dark box-like case 10 for shielding ambient light are provided. A panel-shaped imaging optical element (2) having an imaging function is fitted into the opening 10a on the upper surface of the case 10, and the mounting table is placed inside the case 10 as shown in FIG. 1 is arranged with its mounting surface 1a (photo folder in this example) tilted by a predetermined angle α. Further, inside the case 10, the light source 3 is positioned in a space (a space on the left side of the mounting table 1 in the drawing) that can irradiate the mounting surface 1a following the mounting surface 1a. Light (illumination light) emitted from the light source 3 is reflected upward (on the imaging optical element side) in the above-described photograph or the like on the mounting surface 1a. The reflected light (that is, the image I on the paper P) is imaged upward (I ′) by the imaging action of the imaging optical element (2), and the viewer's viewpoint (white arrow E ) From the upper surface (outer surface) 2a of the imaging optical element (2) can be visually recognized as a three-dimensional aerial image I ′. This is a feature of the display device of the present invention.

  The above-described display device will be described in more detail. The mounting table 1 is configured to be able to be pulled out from one side surface 10c of the case 10 as shown in FIG. Is a placement surface 1a on which a paper P (photograph) printed with can be placed. Then, the placement table 1 is pulled out of the case 10, and the paper P is placed on the placement surface 1a as shown in FIG. 3, and the placement table 1 is slid into the case 10 as shown in FIG. By returning, the paper P is in a predetermined position inclined at a predetermined angle α with respect to the bottom surface 10b of the case 10 and the element surface H of the imaging optical element (2) (or the lower surface 2b of the imaging optical element). It is supposed to be set.

  A support member (such as a guide rail for sliding) that supports the mounting table 1 in an inclined state in the case 10 is not shown. In addition, the inclination angle α of the mounting surface 1a in the case 10 with respect to the element surface H (the inner lower surface 2b) of the imaging optical element (2) is usually 30 ° or more and less than 90 °, preferably 40 ° or more and 80. Set below °. The color of the placement surface 1a (photo folder) is black (chromaticity 0, saturation 0) in consideration of contrast with the paper P (image I) placed thereon and light reflectance. , Lightness 0) or a dark color close to this is desirable.

  Further, as shown in FIG. 3, a self-luminous digital timepiece composed of a segment LED (reference numeral 5), an LED display and the like is incorporated in the mounting surface 1a of the mounting table 1 described above. This digital timepiece is intended to use the display device for displaying time and the like while the image I is not projected, and the segment LED (5) and the like have the paper P placed on the placement surface 1a. It is arranged at a position where it is hidden (cannot be seen) when placed, and is exclusively used for lighting of the light source 3 and the like (see FIG. 2) described later by switching a switch or the like (not shown).

  Furthermore, in the above example, an example in which the mounting surface 1a of the mounting table 1 is flat (flat) is shown. However, the mounting table 1 described above has a concave curved surface that curves the mounting surface 1a with a predetermined radius of curvature [ Alternatively, it may be a mounting surface 1C in FIG. 4A] or a convex curved surface curved with a predetermined radius of curvature (see the mounting table 1D in FIG. 4B). The direction of the curvature (unevenness) may be either the height direction or the width direction of the placement surface 1a, and may be a hemisphere that curves in both directions (if the placement surface 1a is not curved, the paper P itself) May be curved). In these cases, the image I (the aerial image I ′) is imaged from the viewer's viewpoint (see the white arrow E in FIGS. 1 and 2). ) Is inverted and displayed as a convex or concave image. As a result, the spatial image I ′ can be displayed as a stereoscopic image that feels more depth.

  Next, as the imaging optical element (2) used in the display device, various lenses including a Fresnel lens, a refraction-type imaging element such as an afocal optical micromirror and a corner reflector, a microlens array, etc. An erecting equal-magnification imaging element can be used. In particular, in the present embodiment, as shown in FIG. 2, a micromirror array (corner reflector array) 2 that forms an image at a plane-symmetrical position with respect to the element surface H is preferably used. The micromirror array 2 is fixed by being fitted into an opening 10 a provided on the upper surface of the case 10. Note that the micromirror array 2 in the present embodiment has its sides arranged as described above as shown in FIGS. 1 and 7 in order to direct each light reflecting surface (right angle corner) of a minute corner structure to the front of the viewer. The case 10 is disposed in a state rotated by 45 ° with respect to the front surface (viewer side).

  The micromirror array (convex corner reflector array) 2 will be described in detail. As shown in FIG. 5, the micromirror array 2 includes a lower surface of a substrate (substrate) 11 (the lower surface of the optical panel in FIGS. 1 to 3). 2b), a large number of small convex prismatic unit optical elements 12 (corner reflectors) convex downward are arranged in an oblique grid pattern. [FIG. 5 is a view of the array viewed from below. is there. ].

  Each square columnar unit optical element 12 of the micromirror array 2 has a pair of (two) light reflecting surfaces (first side surface on the side of the square column) constituting a corner reflector, as shown in FIG. 12a and the second side surface 12b) each have a "ratio of the longitudinal length (height v) in the substrate thickness direction to the lateral width (width w) in the substrate surface direction" [aspect ratio (v / w)]. It is formed in a rectangular shape of 5 or more.

  Each unit optical element 12 has a pair of light reflecting surfaces (first side surface 12a and second side surface 12b) constituting each corner 12c such that the viewer's viewpoint direction (E in FIGS. 1 and 2). Side). When the micromirror array 2 and its periphery are viewed from above, as shown in FIG. 7, the array 2 has its outer edge (outer side) rotated by 45 ° with respect to the front (E direction) of the viewer. The image I on the lower side of the micromirror array 2 is projected onto a plane symmetric position (above the imaging optical element) with respect to the array 2 (element surface H), and the aerial image I ′ Is imaged.

  Moreover, as a device (illumination device or element) used for the light source 3, a light source capable of emitting “white light” with as little bias as possible over the entire visible light wavelength, such as a white LED or a fluorescent lamp, is desirable. Among these, a white LED with low current consumption and little heat generation due to lighting is preferably employed. The light source 3 may be used by combining a surface emitting lamp using inorganic or organic EL, or LEDs corresponding to the three primary colors of light. Further, by providing an opening in a part of the case 10 and condensing with a lens or the like, or introducing external light outside the case with an optical fiber or the like, illumination light or sunlight outside the case 10, etc. May be irradiated toward the paper P (image I) instead of the light source 3.

  Further, a light shielding member (light shielding plate 4) for preventing light (direct light) from the light source 3 from directly entering the viewer's field of view may be provided in the vicinity of the light source 3 as shown in FIG. The light shielding plate 4 allows the aerial image I 'to be seen more clearly without being obstructed by the light (direct light) of the light source 3.

  Then, as described above, the case 10 for housing the mounting table 1 and the light source 3 has the substantially square micromirror array 2 fitted in the opening 10a on the upper surface, and the side surface 10c has the above description. An opening (rectangular through hole) for taking in and out (sliding) the mounting table 1 is provided. Note that the inner surface of the case 10 except for the portion of the micromirror array 2 is black (chromaticity 0, saturation 0, lightness 0), which is the same as the placement surface 1a described above, in order to prevent irregular reflection due to light. The color is dark.

  Further, sound generation means such as a speaker may be provided in a part of the case 10. By this sound generation means, it becomes possible to output music (BGM), voice, and the like according to the paper P (image I) placed on the placement surface 1a.

  When displaying (projecting) the image I on the display device having the above-described configuration, first, the mounting table 1 is pulled out to the outside of the case 10 and the image I subjected to predetermined processing (image processing described later) is printed. After the loaded paper P (photograph, etc.) is placed on the placement surface 1a (with the top and bottom turned upside down), the placement table 1 is slid into the case and pushed in, and set at a predetermined position to prepare. (See FIGS. 1 and 3). Then, by operating a power source (switch or the like) (not shown) to turn on the light source 3 (the digital clock is turned off), a planar two-dimensional image I (photo or the like) placed on the placement surface 1a. Is displayed (projected) above the panel-shaped imaging optical element (micromirror array 2) as a spatial image I ′ (stereoscopic two-dimensional image) having a sense of depth.

  Next, processing (image processing) of the image I on the paper P, which is performed before setting the paper P (photo or the like) on the mounting table 1, will be described.

  Photographs and image data (electronic data) used in conventional image viewing display devices such as the photo frame and digital photo frame can be used as they are (as they are) as the image I of the display device of the present invention. However, if you want to emphasize (extract) a part of the image, such as a human figure or a specific object in the image, display it in the above photo or image data before use. If the image is processed and processed, the aerial image I ′ displayed by the display device can be emphasized and displayed in a clearer, more floating and stereoscopic sense. It becomes like this. The procedure will be described below.

(1) Acquisition of image data (electronic data) In the case of an image on paper, such as a photograph or a picture, this is photographed with a scanner or a digital camera, and image data is acquired. In the case of a digital still camera, a video, or the like, the still image data of the corresponding image is taken out and prepared.

(2) Trimming / blurring processing Using image processing software (application) that can handle raster data, recognizes (identifies) the outline of a person or display object, and cuts out (trimming) the data. Then, a “blurring process” is performed to randomly average the color tone in the vicinity of the outer edge (near the contour line).

(3) Background processing A portion to be emphasized in the image I to be displayed (the trimming data) by combining the trimmed image data with a monochrome (preferably black, white, or case top color) background. Adjust the size and position on the screen. It is preferable to select “the color of the upper surface of the case” around the imaging optical element (2) as the background color to be combined because the stereoscopic effect of the aerial image I ′ is further increased. Note that the size (aspect ratio) of the background data is such that the sheet just fits on the placement surface 1a (photo folder) of the placement table 1 when printed by a printer or the like.

(4) Contrast adjustment The image processing software is used to adjust the “brightness”, “color”, and “contrast” of the data obtained by combining the image and the background before printing. At this time, among the colors of RGB (256 gradations), the gradation of a color having a gradation of 150 or more (or 200 or more) is increased to 256 (maximum), and the gradation is 100 or less (or 10 or more). It is desirable to perform correction to lower the color gradation to 0 (minimum). Thereby, the contrast (floating feeling) of the image can be further enhanced. The image adjustment may be performed by referring to (feeding back) the print result by a test print.

  Using the image (I) subjected to the image processing as described above, after setting the printed paper P (photo or the like) on the placement surface 1a upside down, as described above, the power switch The two-dimensional image I can be displayed (projected) as a more realistic spatial image I ′ (stereoscopic two-dimensional image) by turning on the light source 3 by operating the above (not shown).

  Next, a second embodiment using a case 13 that is slightly larger than the first embodiment will be described. FIG. 8 is a diagram for explaining the internal structure of the display device and the state of image projection in the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the structural member which has the same function as the said 1st Embodiment, and the detailed description is abbreviate | omitted.

  As in the display device of the first embodiment, a dark box-shaped case 13 that shields ambient light is also used in the display device of the second embodiment. The case 13 is different from the case (10) of the first embodiment in that a slit (slot) 13d for easily setting the paper P on the mounting table 1 is provided on the upper surface 13a. Is a point. Thereby, the display device of the second embodiment does not need to take out the mounting table 1 outside the case when setting the paper P, and arranges the paper P on the mounting surface 1a quickly and easily. Can do.

  When the paper P is taken out after use, the mounting table 1 is slid out of the opening (rectangular through hole) provided in one side surface 13c of the case 13 as in the first embodiment. What is necessary is just to remove and replace the paper P on the placement surface 1a directly exposed.

  Next, an example in which an open housing (14, 15) without a side surface is used as a container for storing the paper P instead of the sealed case (10, 13) will be described. However, the shape of the case and the housing used in the display device of the present invention is not limited to these embodiments.

  9 and 10 are external perspective views of the display device according to the third and fourth embodiments of the present invention, respectively. Note that the aerial image I ′ (in the example, a dog photograph) projected above the micromirror array is not shown. In the display devices of the third and fourth embodiments, the configuration other than the housings (14, 15) and the mounting surface 1a (mounting table 1) is the same as the display devices of the first and second embodiments. For this reason, the same reference numerals are used and detailed description thereof is omitted.

  First, as shown in FIG. 9, the display device of the third embodiment includes a top plate portion 14a, a bottom plate portion 14b, a side plate portion (vertical direction) 14c, and an inclined side portion (inclined plate portion 14d). The housing 14 having no side surface (side portion) in the lateral direction of the paper P (insertion direction of the paper P) is used. The opening provided on the upper surface (top plate portion 14a) of the housing 14 has a micromirror array 2 similar to that of the first and second embodiments (may be micromirror arrays 20, 30, 40, and 50 described later). The upper surface (inner surface) of the inclined plate portion 14d located below is formed on the mounting surface 1a (mounting table 1) on which the paper P on which the image (I) is printed is placed. Has been.

  The inclined plate portion 14d is formed with respect to the bottom plate portion 14b of the housing 14 and the element surface (or its lower surface) of the micromirror array 2 in the same manner as the display mounting surface 1a of the mounting table 1 of the first and second embodiments. Are formed so as to be inclined at a predetermined angle α, and on the upper surface (mounting surface 1a), there are a paper folder (1b) for positioning the paper P, a suction tape and the like (both not shown), It is attached.

  Also with the above configuration, the display device sets the paper P on which the predetermined image (I) is printed on the mounting surface 1a (the inner surface of the inclined plate portion 14d) set to the predetermined angle α. Thus, the planar two-dimensional image (I) is displayed (projected) as a pseudo stereoscopic image (stereoscopic two-dimensional image, aerial image I ′) having a sense of depth above the micromirror array 2. be able to. In addition, the display device is advantageous in that the side surface of the housing 14 has a large opening, so that the insertion and removal of the paper P can be performed easily and easily.

  Next, as shown in FIG. 10, the display device of the fourth embodiment includes a housing 15 provided with an inclined plate portion 15c that supports a substantially horizontal top plate portion 15a and a bottom plate portion 15b. Is used. The micromirror array 2 (may be micromirror arrays 20, 30, 40, and 50 which will be described later) is also disposed in the opening provided on the upper surface (top plate portion 15a) of the housing 15.

  The inclined plate portion 15c located on the lower side of the micromirror array 2 is formed so as to be inclined at a predetermined angle α with respect to the bottom plate portion 15b and the element surface (lower surface) of the micromirror array 2. The same is true in that a paper folder (1b) for positioning the paper P, a suction tape or the like (both not shown) are attached to the upper surface (mounting surface 1a).

  Even with the above configuration, the planar two-dimensional image (I) is simulated with a sense of depth only by setting it on the mounting surface 1a (inner side surface of the inclined plate portion 15c) set to a predetermined angle α. 3D images (stereoscopic two-dimensional images, aerial images I ′) can be displayed (projected). In addition, this configuration also has a feature that the sheet P can be easily taken in and out from the opening because the side surface (three surfaces) of the housing 15 has a large opening.

  In the display device using the open housing (14, 15, etc.) as described above, when the ambient illuminance (brightness) is sufficient, the light source (3) disposed in the housing is used. The aerial image I ′ can be formed only by the reflected light of light (illumination light, sunlight, etc.) incident from the outside without using it. Of course, the light source (3) may be used according to the brightness (darkness), and the light source (3) may be arranged outside the housing as long as space is allowed.

  Next, display devices (fifth and sixth embodiments) in which the upper surface of the case (symbols 10, 13, etc.) or the housing (symbols 14, 15, etc.) is formed obliquely will be described. FIG. 11 is a diagram showing the internal structure of the display device according to the fifth embodiment of the present invention, and FIG. 12 is a diagram showing the configuration of the display device according to the sixth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the structural member which has the function similar to each said embodiment, and the detailed description is abbreviate | omitted.

  The structural features of the display devices of the fifth and sixth embodiments are that the upper surface of the case 10 ′ or the housing 16 that accommodates the paper P is from the front side (right side in the figure) on the front side for the viewer (E side). , A point formed on an “upward inclined surface” that is inclined toward the rear side (the left side in the figure) of the rear side. That is, in the case of the display device of the fifth embodiment shown in FIG. 11, the upper surface on which the imaging optical element (micromirror array 2) is fitted has the same inclination direction as the inclination of the aerial image I ′ (the viewer is present). It is an inclined surface that is inclined upward at a predetermined angle β with respect to the horizontal plane of the device (the viewer's sensory horizontal plane).

  In this example as well, the placement surface 1a on the placement table 1 on which the paper P is placed is inclined at a predetermined angle α with respect to the element surface H of the micromirror array 2 (or its lower surface 2b). The image I on the paper P is formed as an aerial image I ′ at a plane symmetric with respect to the element surface H of the micromirror array 2. Therefore, the inclination angle of the mounting surface 1a with respect to the bottom surface 10'b of the case 10 'is (α-β).

  Further, in the case of the display device of the sixth embodiment shown in FIG. 12, the top plate portion 16a in which the micromirror array 2 is fitted has the same inclination direction as the inclination of the aerial image I ′, that is, the viewer (E side). When viewed from the side, the inclined surface is inclined upward at a predetermined angle β from the front side (front side) to the back side (rear side) with respect to the horizontal plane of the device (sensory horizontal plane of the viewer). Other configurations are the same as those of the display device of the third embodiment (housing 14) shown in FIG.

The inclination angle β of the upper surfaces of the case 10 ′ and the housing 16 with respect to the horizontal is normally set to 1 ° to 60 ° (15 ° in these examples), and the paper P and its placement surface The angle 1a is equal to or smaller than the angle α (30 ° to less than 90 °) with respect to the micromirror array 2. In addition, between the inclination angle β and the inclination angle α,
0 <β ≦ α (where 1 ° ≦ β ≦ 60 °, 30 ° ≦ α <90 °)
The relationship is established.

  As described above, according to the display device having the inclined upper surface, the “device front” (front side) suitable for viewing the aerial image I ′ can be determined depending on the inclination direction of the upper surface of the case, the housing, etc. Can be easily found. For this reason, it is possible to easily find out the direction and position most suitable for viewing, in which the spatial image I 'feels most stereoscopic and the like. In addition, the viewing direction and position are the positions where the floating feeling and the realistic sensation of the aerial image I ′ can be most strongly felt in the display device.

  Furthermore, according to the configuration of these display devices, the depth of the aerial image I ′, the floating feeling, the realistic sensation, and the like between the aerial image I ′ standing obliquely and the upper surface of the case, the housing, etc. located on the rear surface thereof. Produces binocular parallax that emphasizes more. Therefore, the contrast and clearness of the aerial image I ′ (video, image, etc.) are enhanced, and the aerial image I ′ can be viewed from a greater distance. Of course, the configuration in which the upper surface of the case or the like is an upward inclined surface toward the viewer may be applied to other embodiments.

Next, another example of the imaging optical element used in the display device of the present invention will be described.
As a panel-shaped imaging optical element used in the display device of the present invention, in addition to the micromirror array 2 having the above structure, the surface of a flat transparent substrate is parallel to each other by dicing using a rotary blade. It is also possible to use two or one optical element (see micromirror arrays 20, 30, 40, 50 FIGS. 13 to 19) in which a plurality of linear grooves are formed at a predetermined interval.

  These micromirror arrays 20, 30, 40, and 50 are superposed in a state in which one of two optical elements (substrates) having a plurality of parallel grooves on the surface is rotated by 90 ° (FIG. 13, FIG. 15 or 17), or a plurality of parallel grooves perpendicular to each other in plan view are formed on the front and back surfaces of one flat substrate (FIG. 19), so that the substrate front and back direction (vertical direction) When viewed from above, the light-reflective vertical surface (wall surface) of one parallel groove group and the other are at the intersections (intersections of lattices) where one parallel groove group and the other parallel groove group are orthogonal to each other in plan view. A corner reflector composed of a light reflective vertical surface (wall surface) of the parallel groove group is formed.

  The light reflecting wall surface of the parallel groove group of the one substrate and the light reflecting wall surface of the parallel groove group of the other substrate, which constitute the corner reflector, are viewed three-dimensionally (three-dimensionally). In this case, there is a so-called “twist position” relationship. Further, since each of the parallel grooves and the light reflecting wall surface thereof are formed by dicing using a rotary blade, the aspect ratio [height (length in the substrate thickness direction) of the light reflecting surface in the corner reflector is used. ) / Width (width in the horizontal direction of the substrate)], for example, it is advantageous in that the optical performance of the optical element can be adjusted relatively easily.

  The structure of each of the above-described micromirror arrays will be described in more detail individually. The micromirror array 20 shown in FIGS. 13 and 14 is composed of a transparent flat substrate 21 in which each optical element (21, 21 ′) constituting the micromirror array 20 is transparent. , 21 ′, a plurality of linear grooves 21g or grooves 21′g parallel to each other are formed at a predetermined interval by dicing using a rotary blade. The micromirror array 20 uses these two optical elements (substrates 21 and 21 ′) having the same shape to continuously connect the grooves 21g and the grooves 21′g provided on the substrates 21 and 21 ′. In a state where the upper substrate 21 ′ is rotated with respect to the lower substrate 21 so that the directions are orthogonal to each other in plan view, on the surface 21a in which the groove 21g in the lower substrate 21 is formed, By bringing the back surface 21′b (the groove 21′g is not formed) of the upper substrate 21 ′ into contact with each other and fixing the substrates 21 and 21 ′ so as to overlap each other, a set of arrays 20 is obtained. It is configured.

  Similarly, the micromirror array 30 shown in FIG. 15 uses the two optical elements (substrates 21 and 21 ′) having the same shape and manufacturing method as described above to form the upper substrate 21 ′ as shown in FIG. With the substrate 21 'turned upside down and rotated by 90 ° with respect to the lower substrate 21, the surface 21'a in which the groove 21'g is formed on the upper substrate 21' The substrate 21 is in contact with the surface 21a on which the groove 21g is formed, and the substrates 21 and 21 'are overlapped with each other and fixed, whereby the grooves 21g and the grooves provided on the substrates 21 and 21' It is configured as a set of arrays 30 in which the continuous directions of 21′g are orthogonal to each other in plan view.

  Further, the micromirror array 40 shown in FIG. 17 uses two optical elements (substrates 21 and 21 ′) having the same shape and manufacturing method as described above, so that the lower substrate 21 ′ is formed as shown in FIG. With the substrate 21 'turned upside down and rotated by 90 ° with respect to the other upper substrate 21, the back surface 21b of the upper substrate 21 and the back surface 21'b of the lower substrate 21' are brought into contact with each other. A pair of arrays 40 in which the continuous directions of the grooves 21g and the grooves 21′g provided on the substrates 21 and 21 ′ are orthogonal to each other in plan view by fixing the substrates 21 and 21 ′ so as to overlap each other. It is configured as.

  The micromirror array 50 shown in FIG. 19 has linear grooves that are parallel to each other on the upper surface 51a and the lower back surface 51b of the transparent flat substrate 51 by dicing using a rotary blade. 51g and a plurality of grooves 51g ′ are formed at predetermined intervals, and the formation direction (continuous direction) of the grooves 51g on the front surface 51a side and the grooves 51g ′ on the back surface 51b side is orthogonal to each other in plan view. It is formed to do.

  Also in the display device using each of the micromirror arrays 20, 30, 40, and 50, as in the display device using the micromirror array 2, a planar two-dimensional image I (photograph) mounted on the mounting table 1 is obtained. Etc.) can be displayed (projected) as a pseudo stereoscopic image (stereoscopic two-dimensional image, aerial image I ′) having a sense of depth. Moreover, the display device has an advantage that the cost of the entire device can be reduced because the micromirror array (20, 30, 40, 50) to be used is inexpensive.

  According to the display device of the present invention, it is possible to display a realistic three-dimensional two-dimensional image rich in sense of depth while floating above the device body.

DESCRIPTION OF SYMBOLS 1 Mounting stand 1a Mounting surface 2 Micromirror array 2a Upper surface 3 Light source 10 Case H Element surface I Image I 'Space image P Paper

Claims (5)

  A mounting table having a mounting surface for mounting paper on which an image is printed, a light source for irradiating light on the paper on the mounting surface, a panel-shaped imaging optical element, the mounting table and the paper The imaging optical element is disposed on the upper surface of the case, and the lower side of the imaging optical element is inclined at a predetermined angle with respect to the lower surface of the imaging optical element. The above-mentioned mounting surface is arranged, and the projected image of the image on the sheet is reflected by the panel-shaped imaging optics by the light projected from the light source, reflected by the surface of the sheet and transmitted through the imaging optical element. A display device characterized in that an image is formed in a state of floating above an element.   The display device according to claim 1, wherein the case is in a dark box shape that blocks ambient light, and the mounting table and the light source are accommodated therein.   The display device according to claim 1, wherein the case is an open housing whose side surface is open, and the mounting table and the mounting surface are formed by using one surface of the housing.   The display device according to claim 1, wherein an inclination angle of the placement surface with respect to a lower surface of the imaging optical element is set to be 30 ° or more and less than 90 °.   The display device according to claim 1, wherein a placement surface on which the paper is placed has a concave shape or a convex shape that is curved with a predetermined radius of curvature.

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