Display film

Abstract

The display sheet (10) of the present invention is arranged on a display (11) for use, and an infrared emitting element (15) for irradiating infrared rays from the display (11) to space, an infrared receiving element (16) for receiving infrared rays from space to the display (11), and a transmission part (17) for transmitting light emitted by the display (11) to space are arranged side by side or dispersedly to form a sheet. By simply arranging the display sheet (10) on the display (11) and combining it with an optical imaging unit, an input device of an aerial imaging type can be realized, and there is no need to prepare a dedicated display or infrared emitting device separately, and the versatility is excellent.

Description

Technical Field

[0001] The present invention relates to a display sheet which can detect the indicated position simply and reliably in a non-contact manner when a specific position on a real image formed in the air is indicated by an indicating means (for example, a finger). Background Art

[0002] Conventionally, the following touch panels are known: when an image is displayed on a display (display) and a specific part of the image is pressed with a finger, a pressure-sensitive sensor or the like detects the XY coordinates of the pressed part, and the next operation is performed based on the input signal (see, for example, Patent Document 1).

[0003] In addition, in Patent Document 2, a large number of transmitting elements and receiving elements are arranged in parallel along the XY axis directly above the display to form a matrix. When an obstacle (indicating unit) such as a finger or a pen touches the surface of the display, the obstacle crosses the matrix, thereby detecting the position where the obstacle abuts the display.

[0004] On the other hand, in Patent Document 3, the following method and device are proposed: for the first and second light control panels formed by arranging a large number of first and second planar light reflecting parts in parallel and at a certain interval inside a transparent flat plate, the first and second planar light reflecting parts are abutted or close to each other in such a manner that they form an orthogonal state when viewed from above, and the obtained light imaging unit is used to simultaneously display the image of the display and the image diffusely reflected by infrared rays on the surface of the display as regenerated images in the air, and the position of the indicating unit of the regenerated image of the touch display is detected by a two-dimensional infrared camera, thereby detecting the indicated position of the regenerated image of the display.

[0005] In addition, patent document 4 relates to a contactless display input device and method, which has an optical imaging unit that is respectively arranged upright on the same plane and has a plurality of first and second tiny reflection surfaces that cross when viewed from above, and a display arranged on one side of the optical imaging unit. The image of the display is formed as a first image on the other side of the optical imaging unit, and the image position of the indication unit that touches the first image is optically detected. In the above-mentioned contactless display input device and method, a light sensor that only detects light from the front side is provided on the surface of the display, and the reflected light from the indication unit is formed as a second image on the display by the optical imaging unit, and the position of the second image is detected by the light sensor.

[0006] In addition, as described in Patent Document 5, a device has been proposed in which a light sensor is built into a transistor-shaped surface constituting a liquid crystal panel to recognize multi-touch by fingers or movement of a stylus pen on the liquid crystal surface.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2006-39745

[0010] Patent Document 2: Japanese Patent Application Publication No. 2000-56928

[0011] Patent Document 3: Japanese Patent No. 5509391

[0012] Patent Document 4: Japanese Patent Application Publication No. 2017-142577

[0013] Patent Document 5: Japanese Patent Application Publication No. 2011-29919 Summary of the invention

[0014] Problems to be solved by the invention

[0015] However, in Patent Documents 1 and 2, the following structure is used: a specific plane image is displayed on a plane display on the back side of the touch panel, and a specific position on the display is pressed, thereby detecting the input (pressed) position. Therefore, when the image is pressed with a pointing unit such as a finger or a pen, the pointing unit will inevitably hit the display surface, and the display may be dirty or scratched.

[0016] Patent Document 3 has the following problem: in addition to the display panel, an infrared light source, an infrared diffuse reflection surface, and an infrared camera are required, and the device structure is further complicated.

[0017] In Patent Document 4, by providing a light sensor composed of a sheet-like light sensor sheet on the front side of the display, there is no need to assemble the light sensor into the display. However, in order to obtain reflected light from the indication unit, it is necessary to prepare a dedicated display assembled with an infrared emitter, or to provide an infrared emitter outside the display. This lack of versatility will lead to the complication of the structure and the enlargement of the device.

[0018] In addition, Patent Document 5 is an optical touch panel that has a light sensor built into a liquid crystal panel and detects finger or stylus pen or other indicating unit touching the liquid crystal panel by reflected light, rather than an aerial imaging (non-contact) input device as in Patent Documents 3 and 4. A touch panel using such a display can also be used in ATMs, etc., but many non-specific people will touch the screen, so it is unhygienic and not effective for preventing contact infection. In addition, if light is irradiated toward the display, its reflected light is radiated from the display, and sometimes it is difficult to see the display.

[0019] The present invention is made in view of this situation, and its purpose is to provide a display sheet that can realize an aerial imaging (non-contact) input device simply by being set on a display and combined with an optical imaging unit. There is no need to prepare a dedicated display or infrared transmitter separately, and the display sheet has excellent versatility.

[0020] Means for solving problems

[0021] The display sheet of the present invention according to the above-mentioned purpose is configured on a display for use, and an infrared emitting element for irradiating infrared rays from the display to a space, an infrared receiving element for receiving infrared rays from the space toward the display, and a transmitting portion for transmitting light emitted from the display to the space are arranged side by side or dispersedly to form a sheet.

[0022] Here, the infrared receiving element preferably uses a filter or the like so as not to detect visible light, but this is not a necessary condition. The component supporting the infrared emitting element, the infrared receiving element, and the transmission part to the specified position may be non-translucent, or the part other than the infrared emitting element and the infrared receiving element may be formed of a transparent material (e.g., a transparent sheet), and a part or all of the transparent material may be used as the light transmission part of the display.

[0023] In the display sheet of the present invention, a cover is preferably provided on one or both of the infrared emitting element and the infrared receiving element, thereby preventing erroneous detection such as light from the infrared emitting element directly entering the infrared receiving element on the display.

[0024] In the display sheet of the present invention, it is preferred that high frequency modulation or digital modulation is applied to the infrared light emitted by the infrared emitting element.

[0025] Effects of the Invention

[0026] By configuring the display film of the present invention on a display, the light emitted by the display passes through the transmission portion and enters from one side of the light imaging unit set at a specified distance from the display. Therefore, the image displayed on the display is imaged as a first real image (aerial image) on the other side of the light imaging unit. At this time, the infrared light irradiated from the infrared emitting element to the space also enters from one side of the light imaging unit and irradiates the first real image imaged on the other side of the light imaging unit. Then, when the indicating unit contacts the first real image, the infrared light reflected by the indicating unit enters from the other side of the light imaging unit and is imaged as a second real image on the surface of the display film on the display located on one side of the light imaging unit. Therefore, by detecting the position of the second real image through the infrared receiving element, the indicating position (contact position) of the indicating unit with respect to the first real image can be simply and reliably detected.

[0027] In the display film of the present invention, when either or both of the infrared emitting element and the infrared receiving element are provided with a cover, the infrared rays emitted by the infrared emitting element can be prevented from being directly received by the infrared receiving element, and only the second real image (reflected light) reflected from the indicating unit and formed on the surface of the display film is received, thereby being able to accurately detect the indicated position of the indicating unit.

[0028] In the display film of the present invention, when high-frequency modulation or digital modulation is applied to the infrared light emitted by the infrared emitting element, the infrared light irradiated by the infrared emitting element and reflected by the indicating unit can be distinguished from the infrared light existing in nature by the infrared receiving element, thereby improving the detection accuracy when detecting the indicated position indicated by the indicating unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 In the figure, (A) is a partial top view of a display sheet of an embodiment of the present invention, and (B) is a cross-sectional view taken along line AA of (A).

[0030] Figure 2 This is an explanatory diagram of a non-contact input device using the same display sheet.

[0031] Figure 3 In the figure, (A) and (B) are respectively a front cross-sectional view and a side cross-sectional view of the optical imaging unit in the same contactless input device. DETAILED DESCRIPTION

[0032] Next, embodiments of the present invention will be described with reference to the drawings.

[0033] like Figure 2 As shown, Figure 1 The display sheet 10 of one embodiment of the present invention shown in (A) and (B) is arranged on a display 11 for use, and constitutes a part of a non-contact input device 12. When an indicating unit (for example, a finger) 14 indicates a specific position on a first real image 13 formed in the air, the indicated position is detected in a non-contact manner. It should be noted that as a display, in addition to a flat plate display such as a conventional liquid crystal display, a display having a concave and convex surface on only one side and emitting light, such as a keyboard, can also be used. However, in the case of a display having a concave and convex surface such as a keyboard, it is preferable to arrange the display sheet parallel to the concave or convex surface of the display.

[0034] like Figure 1 (A), (B), Figure 2As shown, in the display sheet 10, the infrared emitting element 15 for irradiating infrared rays from the display 11 to the space, the infrared receiving element 16 for receiving infrared rays from the space toward the display 11, and the transmission part 17 for transmitting the light emitted by the display 11 to the space are formed in a sheet-like arrangement or dispersion, and the parts supporting them are composed of non-light-transmitting materials that do not pass visible light or infrared rays. It should be noted that the parts other than the infrared emitting element 15 and the infrared receiving element 16 can also be formed by transparent materials (for example, transparent sheets) as the light-transmitting part of the display 11.

[0035] And, if Figure 1 As shown in (A) and (B), strip-shaped transparent electrodes 19 and 20 for supplying power to each infrared emitting element 15 are arranged in a grid pattern above and below each infrared emitting element 15, and transparent electrodes 21 and 22 for obtaining signals when receiving infrared rays from each infrared receiving element 16 are arranged in a grid pattern above and below each infrared receiving element 16. On the back side (the side that does not detect infrared rays) of each infrared receiving element 16, a non-light-transmitting portion is preferably provided using a non-light-transmitting sheet or the like so as not to detect light from the display 11 on the back side.

[0036] like Figure 1 As shown in (B), a cover (partition) 23 is provided on the periphery of each infrared receiving element 16, which is used to prevent the infrared rays emitted by the surrounding infrared emitting elements 15 from being directly received by the infrared receiving element 16. In this embodiment, a cover 23 is provided only on each infrared receiving element 16, but a cover may be provided only on the infrared emitting element 15, or on both the infrared emitting element 15 and the infrared receiving element 16. It should be noted that when covers are provided on both the infrared emitting element and the infrared receiving element, it is preferred that the height of the cover of the infrared emitting element is higher than the height of the cover of the infrared receiving element (1.5 to 3 times).

[0037] In addition, if Figure 1 As shown in FIG. 1B , the uppermost surface and the lowermost surface of the display sheet 10 are covered by transparent protective plates 24 and 25, respectively. At this time, the transmission part 17 only needs to be able to transmit the light emitted by the display 11, and preferably a transparent resin is used. However, when transparent electrodes 19 and 21 are formed on the protective plate 24 and transparent electrodes 20 and 22 are formed on the protective plate 25, the transmission part 17 may be hollow or filled with a transparent resin. In particular, it is preferred to perform a non-light reflection treatment on the back of the infrared emitting element 15 so that the infrared receiving element 16 does not react to the infrared rays from the infrared emitting element 15.

[0038] like Figure 2As shown, the contactless input device 12 includes an optical imaging unit 27 that is separated from the display 11 by an angle α of 30 to 60 degrees. Light from an image displayed on the display 11 passes through the transmission portion 17 of the display sheet 10 and enters from one side of the optical imaging unit 27, and is imaged as a first real image (air image) 13 on the other side of the optical imaging unit 27 (a position symmetrical to the display 11 across the optical imaging unit 27, hereinafter referred to as an imaging surface 11a).

[0039] The optical imaging unit 27 will be described in detail below.

[0040] like Figure 3 As shown in (A) and (B), the optical imaging unit 27 has a first light control part 31 and a second light control part 33, the first light control part 31 has a plurality of light reflecting surfaces 30 arranged in an upright state with gaps therebetween, the second light control part 33 has a plurality of light reflecting surfaces 32 arranged in an upright state with gaps therebetween, the first and second light control parts 31, 33 are arranged to overlap (integrate) in the thickness direction so that the light reflecting surfaces 30, 32 are orthogonal when viewed from above.

[0041] The first light control unit 31 has a light reflecting surface 30 formed of a mirror surface (metal reflecting surface) on a vertical surface 36 of each groove 37 of a first molding base material composed of a first transparent resin on one side of a first transparent plate 34. The first molding base material is provided with a plurality of grooves 37 having a triangular cross section and a plurality of convex strips 38 having a triangular cross section formed between adjacent grooves 37 at a predetermined interval. It should be noted that micro flat surfaces 39 and 40 are formed at the bottom of the groove 37 (between the lower end of the inclined surface 35 and the lower end of the vertical surface 36) and at the top of the convex strip 38 (between the upper end of the inclined surface 35 and the upper end of the vertical surface 36).

[0042] In addition, the second light control unit 33 forms a light reflecting surface 32 composed of a mirror surface (metal reflecting surface) on the vertical surface 43 of each groove 44 of the second molding base material composed of the second transparent resin on the other side of the second transparent plate 41, and the second molding base material is provided with a plurality of grooves 44 with a triangular cross section having an inclined surface 42 and a vertical surface 43, and a plurality of convex strips 45 with a triangular cross section formed between adjacent grooves 44 at a predetermined interval. It should be noted that micro flat portions 46 and 47 are formed at the bottom of the groove 44 (between the lower end of the inclined surface 42 and the lower end of the vertical surface 43) and at the top of the convex strip 45 (between the upper end of the inclined surface 42 and the upper end of the vertical surface 43), respectively.

[0043] However, it is preferable not to have the minute flat surface portions 40 and 47 .

[0044] Furthermore, the grooves 37 and 44 disposed facing each other are filled with a transparent resin 48 .

[0045] It should be noted that the refractive indices η1 and η2 of the first and second transparent resins are preferably equal (η1 is 0.95 to 1.05 times of η2), and the refractive index η3 of the transparent resin 48 filled therebetween is in the range of 0.8 to 1.2 times (more preferably 0.9 to 1.1 times, and even more preferably 0.95 to 1.05 times) the refractive indices η1 and η2 of the first and second transparent resins.

[0046] As the first and second transparent resins, thermoplastic resins such as cycloolefin polymers, polymethyl methacrylate (acrylic resins), amorphous fluororesins, PMMA, optical polycarbonates, fluorene polyesters, and polyethersulfones can be used, and resins having high melting points and high transparency are particularly suitable.

[0047] As a method of forming a mirror surface (metal reflective surface), a method of directly sputtering, metal vapor deposition, blowing of metal microparticles, irradiation of ion beams, coating of metal paste, etc., on the vertical surfaces 36 and 43 of the grooves 37 and 44 can also be used. However, a resin film formed with a reflective film by sputtering or metal vapor deposition can also be attached to the vertical surfaces 36 and 43 of the grooves 37 and 44. It should be noted that when sputtering, metal vapor deposition, blowing of metal microparticles, irradiation of ion beams, etc. are directly performed on the vertical surfaces 36 and 43 of the grooves 37 and 44, metal particles are irradiated from the oblique upper direction to the vertical surfaces 36 and 43 in a vacuum or under low pressure in a direction along the inclined surfaces 35 and 42 so that the irradiated metal particles do not contact the inclined surfaces 35 and 42. At this time, since the micro-plane portions 39 and 46 are formed at the bottoms of the grooves 37 and 44, respectively, it is possible to alleviate the adhesion of metal particles to the inclined surfaces 35 and 42. Furthermore, the metal particles can be uniformly irradiated to the lower ends of the vertical surfaces 36 and 43. It should be noted that, instead of forming the inclined surfaces 35 and 42 of the grooves 37 and 44 into a flat surface, a polygonal surface with a polygonal cross section recessed toward the inside of the convex strips 38 and 45 or a concave surface with a large number of minute concave and convex (scratches) on the surface may be formed to prevent the adhesion of metal particles.

[0048] As a method of filling the grooves 37 and 44 with transparent resin 48 to integrate the first and second light control units 31 and 33, one side of the first light control unit 31 and the other side of the second light control unit 33, i.e., the side where each groove 37 and 44 is formed, are arranged face to face, and in this state, a sheet of transparent resin having a melting point lower than that of the first and second transparent resins is sandwiched therebetween, and heating and pressing are performed in a vacuum state to dissolve and solidify only the sheet of transparent resin; or a transparent adhesive composed of a transparent resin can be filled in each groove 37 and 44, and the grooves 37 and 44 of the first and second light control units 31 and 33 are aligned face to face, and the transparent adhesive is solidified. As a transparent adhesive, in addition to a light-curing type that is cured by irradiation with ultraviolet rays, a thermosetting type or a two-liquid mixed type adhesive can also be used. In particular, in order to make the refractive index η3 close to the refractive index η1 and η2, an optical adhesive composed of a refractive index adjustment resin with adjusted refractive index is suitable.

[0049] It should be noted that, when the inclined surface of each groove is a polygonal surface, a concave surface, a concave-convex surface, etc., the adhesion between the inclined surface and the transparent resin filled in the groove is improved by the anchoring effect, and the groove can be filled with transparent resin without gaps to eliminate the concave-convex. As a result, light can pass through without generating diffuse reflection (scattering) at the interface between the inclined surface and the transparent resin, and refraction can be suppressed to a minimum, so that a bright and clear spatial image can be obtained.

[0050] Next, the operation of the optical imaging unit 27 will be described.

[0051] exist Figure 2 When an image is displayed on the display 11, its light is radiated toward the optical imaging unit 27. Figure 3 As shown in (A) and (B), when light L1 enters the second light control unit 33 of the optical imaging unit 27 at position P1, the light L1 is reflected at position P2 on the light reflecting surface 32 and enters the first light control unit 31. Then, after being reflected at position P3 of the light reflecting surface 30, it exits the first light control unit 31 at position P4 into the air and forms an image. Figure 3 At Q1 in (A), light enters the first light control unit 31 from the transparent resin 48. However, since the refractive index η1 of the first transparent resin constituting the first light control unit 31 is similar (approximately the same) to the refractive index η3 of the transparent resin 48, total reflection or light splitting does not occur. Figure 3(B) At S1, light enters the transparent resin 48 from the second light control unit 33, but since the refractive index η2 of the second transparent resin constituting the second light control unit 33 is similar (roughly equal) to the refractive index η3 of the transparent resin 48, total reflection or light splitting does not occur. It should be noted that refraction also occurs at positions P1 and P4, but the refractions of P1 and P4 cancel each other out. In addition, the light reflecting surfaces 30 and 32 can make the front and back ( Figure 3 Both the left and right surfaces in (A) and (B) function as light reflecting surfaces.

[0052] It should be noted that, in the process of manufacturing the first and second light control parts 31 and 33, a metal reflective film is sometimes formed on the small plane parts 40 and 47 located at the top of the vertical planes 36 and 43. If the metal reflective film is formed, a small light reflecting surface exists in the light imaging unit 27, and the imaging performance of the light imaging unit is deteriorated. Therefore, it is preferable to remove the metal reflective film formed on the small plane parts 40 and 47 to form a light transmitting surface (non-light reflecting surface), or to form a light absorbing layer (non-light reflecting surface) colored in black (an example of light absorbing color) on the front side and the back side of the metal reflective film so that there is no light reflecting surface.

[0053] According to the optical imaging unit 27 constructed as above, the light emitted from the image of the display 11 on one side is specularly reflected by the light reflecting surface 32, and a second specular reflection is generated by the light reflecting surface 30 thereon. Figure 2 As shown, the image is formed in the space on the other side as the first real image 13. At this time, the infrared light irradiated from the infrared emitting element 15 to the space also enters from one side of the optical imaging unit 27, and overlaps and irradiates the entire surface of the first real image 13 formed on the other side of the optical imaging unit 27 in a planar manner, but cannot be visually recognized.

[0054] Furthermore, when the indicating unit 14 contacts the first real image 13 of the display 11, the infrared rays reflected by the indicating unit 14 enter from the other side of the optical imaging unit 27, and its image (infrared image formed by the reflected light in the shape of the indicating unit 14) is imaged as a second real image 49 on the surface of the display sheet 10 on the display 11 located on one side of the optical imaging unit 27. Since the second real image 49 is an image formed by infrared rays, it cannot be seen visually, but its position can be detected by the infrared receiving element 16, so that the indicated position (contact position) of the indicating unit 14 with respect to the first real image 13 can be detected simply and reliably, and input operation can be performed. At this time, if high-frequency modulation or digital modulation is applied to the infrared rays emitted by the infrared emitting element 15, the infrared rays reflected by the indicating unit 14 and the infrared rays existing in nature can be distinguished by the infrared receiving element 16, so that the detection accuracy when detecting the indicated position indicated by the indicating unit 14 can be improved. By using the display sheet 10, it is unnecessary to build an infrared emitting element or an infrared receiving element into the display, or to provide an external infrared emitting unit or an infrared camera, and thus a non-contact input device can be easily constructed using an existing display.

[0055] In addition, if Figure 2 As shown, the frame 50 can be provided so as to surround the first real image 13, thereby making it possible to clearly define the operation area based on the indication unit 14. In addition, instead of providing the frame 50, the frame can be displayed together with the image displayed on the display 11 in advance so that the frame is displayed as a part of the first real image.

[0056] It should be noted that the imaging position of the indication unit 14 that has not reached the imaging surface 11a is a position that exceeds the surface position of the display 11 (the back side of the display 11). Since the image of the indication unit 14 that is out of focus is displayed on the surface of the display 11, a focus detection unit that detects brightness gradient differences or only detects images that are in focus is set using the infrared receiving element 16 to remove the data of the image that is out of focus. In addition, the image center of the indication unit 14 is calculated to detect the indication position on the display 11. In addition, the imaging position of the indication unit 14 that has passed the imaging surface 11a is located in front of the surface position of the display 11 (the side of the optical imaging unit 27), so the same processing as above is performed to remove the data of the image that is out of focus.

[0057] Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations described in the embodiments above, and includes other embodiments and modifications that can be considered within the scope of the matters described in the claims.

[0058] For example, the image and the first real image displayed by the display are not limited to plane images, but may also be three-dimensional images. In this case, a portion (specific depth position) of the three-dimensional image formed as the first real image is surrounded by a frame, and the first real image can be touched within the range surrounded by the frame for input. For example, in the case where a three-dimensional image of a button switch such as a keyboard is formed as the first real image, if the frame is configured according to the surface position (height) of the button switch, the surface of the three-dimensional image (first real image) of the button switch can be smoothly touched to input. At this time, on the display side, if the touched button switch is illuminated or the display color of the button switch is changed, the observer (input operator) can easily confirm which button switch is touched on the first real image. In addition, the input can also be confirmed by emitting a sound according to the timing of touching the button switch in the indication unit.

[0059] In the above-mentioned embodiment, a cover is provided on either or both of the infrared emitting element and the infrared receiving element, but instead of or in addition to the cover, a louver may be installed on the surface of the display sheet so that the infrared rays emitted by the infrared emitting element do not diffuse and irradiate to a specified range. In this case, the louver is preferably arranged upright to be orthogonal to the surface of the display sheet, but it may also be inclined as required. In addition, the height of the louver can be appropriately selected according to the distance from the display to the optical imaging unit and the angle α formed by the display and the optical imaging unit. The louver may be arranged only along the periphery of the display sheet, but it is preferred to arrange a plurality of louvers in parallel according to the arrangement (pitch) of the infrared emitting element. In particular, when the louver is arranged in a grid shape (vertically and horizontally), the diffusion of infrared rays can be effectively prevented. It should be noted that the louver is preferably colored black or the like so that the infrared rays are not transparent. In addition, due to the difference in the infrared intensity received by each infrared receiving element, the position where the infrared intensity above the specified value is obtained within the range of the second real image can be judged as the focus position (the position where the image is clear), and detected as the indicated position based on the indicating unit.

[0060] It should be noted that, in the above-mentioned embodiment, as the light imaging unit, a light imaging unit is used in which the front sides (surfaces with grooves formed) of the first and second light control parts are connected to each other, but the light imaging unit only needs to have the light reflection surfaces of the first and second light control parts be configured in a manner that is orthogonal when viewed from above. Therefore, there are also cases in which the front sides and back sides of the first and second light control parts are connected to each other, and there are cases in which the back sides of the first and second light control parts are connected to each other. In addition, instead of using two transparent plates to form the first and second light control parts respectively and joining them, the first and second light control parts can also be formed on one side and the other side of a transparent plate. It should be noted that, as the first and second light control parts, instead of forming a mirror surface (metal reflection surface) on the vertical surface of each groove of the first and second molding base materials, if a gas such as air is sealed in the groove or the groove is made vacuum, the vertical surface of each groove can be directly used as a light reflection surface by utilizing total reflection of light.

[0061] In addition, in the above-mentioned embodiment, as the light imaging unit, a light imaging unit having a plurality of light reflecting surfaces of the first and second light control parts respectively arranged in a straight line (in parallel) is described, but a light imaging unit having a first light control part having a plurality of light reflecting surfaces arranged in a radial shape and a second light control part having a plurality of light reflecting surfaces arranged in a concentric circle shape may also be used. In this case, the radial light reflecting surfaces of the first light control part are arranged in a straight line with the reference point X as the center, while the concentric light reflecting surfaces of the second light control part are curved along concentric circles with the reference point Y overlapping with the reference point X when viewed from above, but the light reflecting surfaces are orthogonal to each other at the point where they intersect when viewed from above. Thus, the same operation as in the above-mentioned embodiment can be performed.

[0062] Furthermore, as the optical imaging unit, for example, the optical imaging unit described in Japanese Patent No. 5420774 may be used, or the unit optical elements having two orthogonal light reflecting surfaces described in Japanese Patent No. 4734652 may be arranged in a planar shape.

[0063] It should be noted that the optical imaging unit only needs to be able to image the image displayed on the display in space. In addition to the optical imaging unit formed by combining the first and second light control units, for example, a double-sided mirror or lens with a large number of orthogonal reflecting surfaces can also be used.

[0064] Industrial Applicability

[0065] By merely placing the display sheet of the present invention on a display and combining it with, for example, an optical imaging unit, an aerial imaging (non-contact) input device can be realized. There is no need to separately prepare a dedicated display or infrared transmitter with an infrared light source or infrared receiving unit assembled inside, and a conventional display can be used, thereby reducing the cost of the device.

[0066] Explanation of symbols

[0067] 10: display sheet, 11: display, 11a: imaging surface, 12: non-contact input device, 13: first real image, 14: indication unit, 15: infrared emitting element, 16: infrared receiving element, 17: transmission part, 19 to 22: transparent electrode, 23: cover (partition), 24, 25: protection plate, 27: light imaging unit, 30: light reflecting surface, 31: first light control part, 32: light reflecting surface, 33: second light control part, 34: first transparent plate, 35: inclined surface, 36: vertical surface, 37: groove, 38: convex strip, 39, 40: micro flat surface part, 41: second transparent plate, 42: inclined surface, 43: vertical surface, 44: groove, 45: convex strip, 46, 47: micro flat surface part, 48: transparent resin, 49: second real image, 50: frame

Claims

1. A display sheet which is used on a normal display and is combined with an optical imaging unit of an aerial imaging type to form a display sheet of a non-contact input device, characterized in that: An infrared emitting element that radiates infrared rays into space, an infrared receiving element that receives infrared rays from the space, and a transmitting portion made of a transparent material that transmits light emitted by the display into the space are arranged side by side on the same plane without overlapping each other to form a sheet.

2. The display sheet according to claim 1, characterized in that: A cover is provided on one or both of the infrared emitting element and the infrared receiving element.

3. The display sheet according to claim 1, wherein: High-frequency modulation or digital modulation is applied to the infrared rays emitted by the infrared emitting element.

Images