WO2022190751A1 - Dispositif d'affichage aérien - Google Patents

Dispositif d'affichage aérien Download PDF

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Publication number
WO2022190751A1
WO2022190751A1 PCT/JP2022/005108 JP2022005108W WO2022190751A1 WO 2022190751 A1 WO2022190751 A1 WO 2022190751A1 JP 2022005108 W JP2022005108 W JP 2022005108W WO 2022190751 A1 WO2022190751 A1 WO 2022190751A1
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WIPO (PCT)
Prior art keywords
light
guide plate
display device
light guide
aerial display
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PCT/JP2022/005108
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English (en)
Japanese (ja)
Inventor
勝平 浜田
敦 山田
知子 大原
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ミネベアミツミ株式会社
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Publication of WO2022190751A1 publication Critical patent/WO2022190751A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
    • G02B30/56—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/60—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images involving reflecting prisms and mirrors only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/18—Edge-illuminated signs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106—Processing image signals
    • H04N13/122—Improving the 3D impression of stereoscopic images by modifying image signal contents, e.g. by filtering or adding monoscopic depth cues
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays

Definitions

  • the present invention relates to an aerial display device.
  • an aerial display device includes a retroreflective sheet, a plurality of planar light emitters, and a half mirror.
  • the retroreflective sheet has a plurality of through holes representing figures to be displayed in the air.
  • the plurality of planar light emitters are arranged on the back side of the retroreflective sheet for each light emission pattern formed by the through holes of the retroreflective sheet.
  • the half mirror is arranged on the exit surface side of the retroreflective sheet.
  • An aerial display device is suitable for displaying a fixed light emission pattern in the air, and can change brightness and color for each light emission pattern.
  • FIG. 1 is a diagram of an example of an aerial display device according to an embodiment, viewed from the display surface side.
  • FIG. 2 is a cross-sectional view taken along the line XX in FIG.
  • FIG. 3 is an exploded perspective view of the main parts of the aerial display device.
  • FIG. 4 is a diagram showing an arrangement example of an operation panel in a private toilet room.
  • FIG. 5A is a diagram showing an example of vertical and horizontal light distribution for an aerial display.
  • FIG. 5B is a diagram showing an example of light distribution in the vertical direction and the horizontal direction of a planar light emitter composed of a light guide plate or the like.
  • FIG. 6 is a diagram showing a configuration example of a light source and a light guide plate that constitute a planar light emitter.
  • FIG. 1 is a diagram of an example of an aerial display device according to an embodiment, viewed from the display surface side.
  • FIG. 2 is a cross-sectional view taken along the line XX in FIG.
  • FIG. 7 is a diagram showing another configuration example of the light source and the light guide plate that constitute the planar light emitter.
  • FIG. 8 is a diagram showing an example of changes in emitted light flux with respect to the thickness of the end of the light guide plate for Type-1 and Type-2 in FIG.
  • FIG. 9 is a diagram showing an example of luminance with respect to a light distribution angle in a light guiding direction in a single light guide plate constituting a planar light emitter.
  • FIG. 10 is a diagram showing a configuration example of a light source, a light guide plate, and a prism sheet that constitute a planar light emitter.
  • FIG. 11 is a diagram showing an example of refraction and total reflection of light by the Type-3 prism sheet of FIG. FIG.
  • FIG. 12 is a diagram showing a more specific optimized example of the V-prism optical element provided on the exit surface side of the light guide plate.
  • FIG. 13 is a diagram showing a more specific optimized example of the dot optical elements provided on the reflective emission surface side of the light guide plate and the prism optical elements provided on the reflective emission surface side of the prism sheet.
  • FIG. 14 is a diagram showing an example of light distribution of a planar light emitter composed of an optimized light guide plate or the like.
  • FIG. 15 is a diagram showing an example of luminance with respect to the light distribution angle in the light guiding direction of a planar light emitter composed of an optimized light guide plate or the like.
  • FIG. 16 is a diagram showing an example of an aerial display device serving as a comparative example, viewed from the display surface side. 17 is a cross-sectional view taken along the line XX in FIG. 16.
  • FIG. 16 is a diagram showing an example of an aerial display device serving as a comparative example, viewed from the display surface side.
  • FIG. 1 is a diagram showing an example of an aerial display device 1 according to one embodiment, viewed from the display surface side.
  • FIG. 2 is a cross-sectional view taken along the line XX in FIG.
  • FIG. 3 is an exploded perspective view of the main part of the aerial display device 1.
  • FIG. The aerial display device 1 shown in FIGS. 1 to 3 is assumed to be used as an operation panel installed on the wall surface of a private restroom or the like, and the display surface faces the horizontal direction.
  • the aerial display device 1 has a reflective sheet 8 fixed to a portion of the inner bottom surface 2b of the frame 2 in which a substantially rectangular opening 2a is formed.
  • a planar light emitter composed of a substrate 31, a light source 32, a light guide plate 4, a prism sheet 15, and a louver sheet 10 is provided for each light emission pattern.
  • Each light guide plate 4 is arranged to face the reflecting surface of the reflecting sheet 8 .
  • a common light source control board 16 is provided for a plurality of planar light emitters, and one end of the board 31 is connected to the light source control board 16 .
  • the light source control board 16 is fixed to the non-emission surface side of the sensor electrode 14A, which will be described later.
  • each light guide plate 4 on the light incident side surface 4 a side is fixed to the substrate 31 , and the light incident side surface 4 a faces the light emitting portion of the light source 32 arranged on the substrate 31 .
  • a predetermined range on the side of the light incident side surface 4a of the light guide plate 4 is a color mixing area for color mixing, and the main surface on the terminal side thereof is an exit surface.
  • Sheets 10 are arranged one on top of the other. Note that the louver sheet 10 may be omitted.
  • a retroreflective sheet 5 having a plurality of through holes 5a representing figures to be displayed in the air is provided.
  • the reflecting surface is directed toward the exit surface side (the side opposite to the light guide plate 4).
  • the reflective sheet 8 is for increasing light efficiency and brightness by returning light leaking from the light guide plate 4 to the back side to the light guide plate 4 .
  • the substrate 31 is configured by a flexible substrate or the like, and includes wiring for supplying power to the light source 32 .
  • the light source 32 is, for example, a side-view type (a type that emits light from the side surface of the package) RGB-LED having red, green, and blue light emitting elements inside. are provided. By using RGB-LEDs, it becomes easier to control the emission color. In addition, since the RGB-LED is small, it is possible to reduce the thickness of the planar light emitter. By making the RGB-LED a side-view type, the substrate can be arranged parallel to the emission surface, and further reduction in thickness can be achieved.
  • the light source 32 can be a top-view type (a type that emits light from the top surface of the package) RGB-LED, although the advantage of thinning is lost.
  • the light source control board 16 is mounted with control circuit components for controlling the amount and color of light emitted from the light source 32 .
  • the light guide plate 4 is made of a transparent material such as polycarbonate or acryl, guides the light incident from the light incident side surface 4a to the end side, and diffuses the light by dot optical elements provided on the back surface (non-display surface) side.
  • the V-prism optical element (a lenticular lens is also possible) provided on the exit surface side controls the light distribution in the arrangement pitch direction of the light sources 32 .
  • a prism sheet 15 is provided to control the light distribution in the light guiding direction.
  • the prism sheet 15 is a sheet in which prisms extending in one direction (the X-axis direction in the drawing) are formed on the surface of a transparent sheet. These are realized by the light guide plate 4 and the prism sheet 15 by not using the linear light source in the comparative examples (FIGS. 16 and 17) to be described later, and controlling the light distribution that the linear light source was responsible for. .
  • the louver sheet 10 is a sheet that functions to pass light in a predetermined direction (light directed downward to the left in FIG. 2) and suppress light in other directions. Details of functions of the dot optical element of the light guide plate 4, the V-prism optical element, and the prism sheet 15 will be described later.
  • the portion of the retroreflective sheet 5 on the exit surface side where the through holes 5a are not provided has the property of emitting the incident light through the same path (the incident angle and the emitting angle are the same).
  • the retroreflective sheet 5 has, for example, transparent microscopic glass bead spheres or the like arranged on the surface without gaps.
  • the retroreflective sheet 5 utilizes the inner surfaces of the vertexes of a cube called a corner cube, in which three surfaces having the property of reflecting light are combined at right angles to each other. can also be used. In this case, although the cost is slightly higher, there is an advantage that the light utilization efficiency is high and the blurring of the aerial display (aerial image) is reduced.
  • a half mirror 6 is arranged on the display surface side of the frame 2 so as to cover the opening 2a, and a top cover 7 is superimposed on the half mirror 6 on the outside.
  • the top cover 7 can be omitted by applying a hard coat treatment to the outer side (viewing side) of the half mirror 6, but since the half mirror 6 is in the form of a film, a transparent resin plate for support is required. Become.
  • the hard coat treatment is performed for the purpose of scratch prevention, antifouling, antibacterial, etc. Even when the top cover 7 is arranged on the outside, it is preferable to apply the hard coat treatment to the top cover 7 .
  • the half mirror 6 is an optical member that has the property of reflecting about half of the incident light and transmitting about the remaining half.
  • the top cover 7 is made of transparent material and serves to protect the half mirror 6 . By reducing the transmittance of the top cover 7, it becomes difficult to see the inside of the aerial display device 1 from the outside, and only the aerial display can be seen easily. Also, the retroreflective sheet 5 and the half mirror 6 may be arranged with a slight inclination to each other.
  • a pair of sensor electrodes 14A and 14B are provided vertically (in the Y-axis direction) for each light emission pattern.
  • a voltage between the sensor electrodes 14A and 14B electric lines of force are generated between the sensor electrodes 14A and 14B.
  • a touch on the aerial display I can be detected from the change. Since the user's finger F only touches the aerial display I and does not touch an actual button or the like, it is desirable from a sanitary point of view.
  • an IR (infrared) sensor or the like may be used to detect the contact of the finger F with the aerial display I and control the on/off of the corresponding function.
  • light emitted from the light source 32 through the light guide plate 4, the prism sheet 15 and the louver sheet 10 passes through the through holes 5a of the retroreflective sheet 5 and exits along the path L1.
  • the dot optical element of the light guide plate 4, the V prism optical element, and the prism sheet 15, the light is emitted in a direction where the eye point EP on the display surface side does not exist (lower left side in FIG. 2), and the eye point EP is The existing light emitted in a predetermined direction (light emitted through the path L0) is suppressed.
  • the eyepoint EP is a position that is assumed to be viewed by the user.
  • FIG. 4 is a diagram showing an arrangement example of the operation panel 100 in the private toilet room.
  • An aerial display device 1 is arranged in front of the operation panel 100 .
  • the operation panel 100 is provided at a position on the wall W within easy reach of the user M sitting on the toilet seat T.
  • the height of the operation panel 100 from the floor surface is, for example, 1 m, and the horizontal position is equivalent to the position of the user M's knees.
  • the vertical viewing range of the aerial display I is, for example, 10 degrees to 35 degrees above the horizontal direction.
  • the horizontal viewing range of the aerial display I is, for example, ⁇ 40 degrees.
  • FIG. 5A is a diagram showing an example of vertical and horizontal light distribution of the aerial display device 1, where the vertical axis is the vertical light distribution angle (0° at the front) and the horizontal axis is the horizontal light distribution angle. (0° to the front).
  • the light distribution is defined more strictly in consideration of the ratio of the luminance of each point to the central luminance.
  • the central luminance is the luminance at the point where the vertical direction is 23° and the horizontal direction is 0°
  • the points where the ratio of luminance to the central luminance should be 50% or more are indicated by black circles, and the ratio is 30% or more.
  • the black squares indicate the points where .
  • FIG. 5B is a diagram showing an example of light distribution in the vertical and horizontal directions of a planar light emitter composed of the light guide plate 4 and the like.
  • the horizontal direction is the same as in FIG. It's reversed. This is because, as described above, due to the reflection by the half mirror 6 and the retroreflection by the retroreflection sheet 5, the emission direction from the planar light emitter has a symmetrical relationship with the direction in which the aerial display is performed.
  • FIG. 6 is a diagram showing a configuration example of the light source 32 and the light guide plate 4 that constitute the planar light emitter.
  • the left side is a view seen from the front of the display surface
  • the right side is a view seen from the side.
  • the light entrance side of the light guide plate 4 (the side where the light entrance side surface 4a is provided) is provided with a color mixing area of 10 mm with respect to the overall length of 37 mm for color mixing of the light source 32 by the RGB-LEDs.
  • the dot optical element 4d for emission is not provided in this mixed color area, and the dot optical element 4d is provided in the effective area below the mixed color area. This is because the red, green, and blue light-emitting elements are arranged at small intervals in the RGB-LED package. This is because parting will occur.
  • an optical element such as a lenticular lens or a prism for diffusing light on the light incident side surface 4a of the light guide plate 4
  • color mixing can be completed in a short distance, and the length of the light guide direction of the color mixing area can be shortened. can be done.
  • a V-prism optical element (a lenticular lens is also possible) for controlling the light distribution in the pitch direction of the light source 32 is provided on the light emitting surface side of the light guide plate 4, which will be described later.
  • FIG. 7 is a diagram showing another configuration example of the light source 32 and the light guide plate 4 that constitute the planar light emitter.
  • two types having a wedge-shaped cross section with different thicknesses of the light guide plate 4 are shown in the right side view.
  • Type-1 the thickness is reduced in the mixed color area from the incident side surface 4a having a thickness (1 mm) to match the size of the light source 32, and the thickness is constant in the effective area.
  • Type-2 has a thickness (1 mm) to match the size of the light source 32, and the thickness is reduced from the incident side surface 4a to the terminal end side.
  • the back side on which the dot optical element 4d is provided is an inclined surface.
  • FIG. 8 is a diagram showing an example of changes in emitted light flux with respect to the thickness of the terminal end of the light guide plate 4 according to Type-1 and Type-2 in FIG.
  • Type-2 is preferable in the area where the thickness of the terminal end of the light guide plate 4 is thin, because the emitted light flux is larger. This is because, in Type-1, the angle of light reflection changes in the portion from the light incident side surface 4a until the thickness decreases and becomes constant, and light whose light distribution cannot be controlled is generated.
  • FIG. 9 is a diagram showing an example of the luminance with respect to the light distribution angle in the light guide direction of the light guide plate 4 alone constituting the planar light emitter, and is based on the Type-2 light guide plate 4 in FIG.
  • the four curves correspond to the contact angle of the dot optical element 4d provided on the back surface of the light guide plate 4 (the angle formed by the tangent to the edge of the spherical surface forming the dots and the plane on which the dots are provided). ing.
  • the solid line is for a contact angle of 10°
  • the dashed line is for a contact angle of 20°
  • the one-dot-two chain line is for a contact angle of 30°
  • the two-dot chain line is for a contact angle of 40°.
  • the rectangular broken line area shown near the center of FIG. 9 corresponds to the vertical light distribution range (FIG. 5B) required for the planar light emitter, and the dot optical element 4d alone is sufficient. It can be seen that the light distribution in the vertical direction cannot be controlled. Therefore, the prism sheet 15 is provided.
  • FIG. 10 is a diagram showing a configuration example of the light source 32, the light guide plate 4, and the prism sheet 15 that constitute the planar light emitter.
  • a V-prism optical element 4e is provided for controlling the light distribution in the pitch direction of the arrangement of the light sources 32 when viewed from the front of the display surface on the left side.
  • the V-prism optical element 4e has a triangular concavo-convex surface as shown in a partially enlarged view.
  • the V-prism optical element 4e can be replaced by a lenticular lens having an arc-shaped cross section.
  • FIG. 10 is a diagram showing an example of refraction and total reflection of light by the Type-3 prism sheet 15 of FIG.
  • incident light L11 is refracted to become light L12, and further refracted to emerge as light L13.
  • the light L21 enters the inside, becomes light L22 by total reflection, is further refracted, and is emitted as light L23.
  • Type-4 has a wider light distribution than Type-3, and more light is emitted in the direction of the eye point, which is not preferable. Therefore, Type-3 is more preferable.
  • FIG. 12 is a diagram showing a more specific optimized example of the V-prism optical element 4e provided on the exit surface side of the light guide plate 4.
  • the length of the base of the triangular cross section of the V-prism optical element 4e is 100 ⁇ m
  • the base angle of both ends is 10°
  • the apex angle is 160°.
  • FIG. 13 is a diagram showing a more specific optimized example of the dot optical element 4d provided on the reflective emission surface side of the light guide plate 4 and the prism optical element 15a provided on the reflective emission surface side of the prism sheet 15.
  • the dot optical element 4d of the light guide plate 4 has a contact angle of 29.6°, a bottom diameter of 40 ⁇ m, and a height of 5.2 ⁇ m.
  • the base angle of the upper side of the prism optical element 15a of the prism sheet 15 is 74.4°, the apex angle is 75°, and the pitch is 50 ⁇ m.
  • FIG. 14 is a diagram showing an example of the light distribution of a planar light emitter composed of the optimized light guide plate 4 and the like. It is a horizontal light distribution angle (0° at the front). A rectangular area surrounded by a dashed line in the figure corresponds to the area where the ratio is 30% in FIG. 5B.
  • the luminance at each light distribution angle ([cd/m 2 ]) and the ratio of luminance to the central luminance ([%]) are shown in Table 1 below. It is assumed that the louver sheet 10 is not provided. As can be seen from Table 1, the requirements for the light distribution of Figure 5B are met.
  • FIG. 15 is a diagram showing an example of luminance with respect to the light distribution angle in the light guiding direction of a planar light emitter composed of the optimized light guide plate 4 and the like. It is assumed that the louver sheet 10 is not provided.
  • the solid-line curve indicates the case of the above-mentioned optimized Type-3, and the broken-line curve indicates the case of Type-4 with the prism surface on the output side for comparison.
  • a rectangular area surrounded by a dashed line near -30° in the figure corresponds to the area (target area) where the ratio is 30% in FIG. 5B.
  • a rectangular area surrounded by dashed lines of 0° or more is light that is directly emitted in the direction of the eyepoint, and is light that should be suppressed as small as possible.
  • the brightness of Type-4 is higher in the target area, but the amount of light directly emitted in the direction of the eye point is also increased, which is not preferable.
  • the light emitted directly in the direction of the eyepoint is sufficiently suppressed.
  • the louver sheet 10 is used when that portion needs to be removed. The louver sheet 10 passes light in the direction of the target area and suppresses light in other directions.
  • FIG. 16 is a view from the display surface side showing an example of an aerial display device 1' serving as a comparative example.
  • 17 is a cross-sectional view taken along the line XX in FIG. 16.
  • an aerial display device 1' has a linear light source 3' and a light guide plate 4' which constitute a planar light emitter in a frame 2' having a substantially rectangular opening 2a'. are placed.
  • the linear light source 3' is a light source that emits linear light along the longitudinal direction (X-axis direction) of the light incident side surface 4a' of the light guide plate 4'. It includes a light bar and a prism bar molded out of transparent material.
  • the light guide plate 4' is similarly formed of a transparent material such as polycarbonate or acrylic, guides the light incident from the light incident side surface 4a' to the end side, and is provided on the rear surface (non-display surface) side. Light is reflected by the light-emitting portion 4b' formed by. By adjusting the optical element of the light emitting unit 4b', the light is emitted in a direction where the eye point EP' on the display surface side does not exist (lower left side in FIG. 17), and is emitted in a predetermined direction where the eye point EP' exists. I try to keep the light out.
  • the light-emitting portion 4b' of the light guide plate 4' covers the positions of a plurality of through-holes 5a' that may be used to represent a figure to be displayed in the air in the retroreflective sheet 5' described later.
  • a reflective sheet 8' is arranged so as to cover the opening 2a'. , which increases light efficiency and brightness.
  • a retroreflective sheet 5′ having a plurality of through-holes 5a′ representing figures to be displayed in the air at positions corresponding to the light emitting parts 4b′ is provided so that the reflection surface is on the exit surface side. It is arranged toward (the side opposite to the light guide plate 4').
  • a half mirror 6' is arranged on the display surface side of the frame 2' so as to cover the opening 2a', and a top cover 7' is superimposed on the outside of the half mirror 6'.
  • the light emitted from the light emitting portion 4b' of the light guide plate 4' which constitutes the planar light emitter, passes through the through hole 5a' of the retroreflective sheet 5' and emerges along the path L1'. About half of this light is reflected by the half mirror 6' and strikes the retroreflective sheet 5' along the path L2'. The light striking the retroreflective sheet 5' returns to the half mirror 6' along the path L3' at the same exit angle as the incident angle, and about half of the light is transmitted. Even if the angle of the path L1' changes, the light emitted from a certain point of the light emitting part 4b' passes through the same position outside the aerial display device 1' due to the geometric relationship.
  • An aerial display I' by an aerial image is performed on the outside of ', can be visually recognized from the user's eye point EP', and can cause the user to perform a touching action with the finger F'.
  • the floating display device 1' of the comparative example shown in FIGS. 16 and 17 light is supplied from the light emitting portion 4b' of one light guide plate 4' for all the light emission patterns of the through holes 5a' of the retroreflective sheet 5'. Therefore, it was difficult to change the brightness and color for each light emission pattern.
  • the aerial display device 1 of the embodiments of FIGS. 1 to 15 since the planar light emitter is provided for each light emission pattern, it becomes easy to change the brightness and color for each light emission pattern.
  • the planar light emitter is composed of a linear light source 3' and a light guide plate 4', and the linear light source 3' is composed of a light bar and a prism bar. Since there are many types of molded products and many types of molds, it is difficult to reduce costs. In this respect, according to the aerial display device 1 of the embodiment of FIGS. 1 to 15, the molded product is only the light guide plate 4, so even if there are a plurality of light guide plates 4, it can be manufactured from one mold. , cost reduction can be achieved by reducing the number of types of molds. Further, according to the aerial display device 1 of the embodiment, since the RGB-LED is used for the light source 32, it is possible to easily control the color of the aerial display and to achieve a thin device.
  • the aerial display device includes a retroreflective sheet having a plurality of through-holes representing figures to be displayed in mid-air, and light emitting patterns formed by the through-holes of the retroreflective sheet. and a half-mirror arranged on the exit surface side of the retroreflective sheet. This makes it suitable for displaying a fixed light emission pattern in the air, and allows the brightness and color to be changed for each light emission pattern.
  • the planar light emitter includes a plurality of point-like light sources, a light guide plate having a light incident side surface facing the plurality of point-like light sources and having dot optical elements provided on one main surface, and a light guide plate. and a prism sheet that is arranged on the exit surface side and controls the light distribution in the light guide direction.
  • the light guide plate which can be manufactured with one type of mold, is enough for the molded product, so that the cost can be reduced.
  • even without using a linear light source it is possible to achieve uniformity in brightness and control the light distribution to a desired level.
  • the light guide plate is provided with an optical element consisting of a V-prism or a lenticular lens for controlling the light distribution in the pitch direction of the plurality of point-like light sources on the other principal surface.
  • an optical element consisting of a V-prism or a lenticular lens for controlling the light distribution in the pitch direction of the plurality of point-like light sources on the other principal surface.
  • the plurality of point-like light sources are RGB-LEDs each having red, green, and blue light-emitting elements inside. As a result, it is possible to easily control the color of the aerial display and to reduce the thickness of the device.
  • the light guide plate has, on the light incident side, a color mixing area in which dot optical elements are not provided for color mixing. Thereby, sufficient color mixing is performed, and color separation can be prevented.
  • another optical element for diffusing light is provided on the light incident side surface of the light guide plate.
  • the length of the color mixing area for color mixing in the light guiding direction can be shortened.
  • the light guide plate has a wedge-shaped cross section in which the thickness on the terminal side is thinner than the thickness on the light incident side.
  • the prism surface of the prism sheet is provided on the light guide plate side surface or the exit surface side surface.
  • the prism surface is provided on the light guide plate side, the light distribution can be narrowed compared to when the prism surface is provided on the exit surface side, and the emitted light in the direction of the eye point can be reduced. can.
  • the prism surface is provided on the surface on the output surface side, the performance is slightly degraded, but it can be sufficiently put into practical use.
  • planar light emitter includes a louver sheet arranged on the exit surface side. As a result, the emitted light in the eyepoint direction can be further reduced.
  • the present invention is not limited by the above-described embodiment.
  • the present invention also includes those configured by appropriately combining the respective constituent elements described above. Further effects and modifications can be easily derived by those skilled in the art. Therefore, broader aspects of the present invention are not limited to the above-described embodiments, and various modifications are possible.
  • 1 aerial display device 2 frame, 2a aperture, 2b bottom surface, 31 substrate, 32 light source, 4 light guide plate, 4a light incident side surface, 4d dot optical element, 4e V prism optical element, 5 retroreflective sheet, 5a through hole, 6 Half mirror, 7 Top cover, 8 Reflection sheet, 10 Louver sheet, 14A, 14B Sensor electrode, 15 Prism sheet, 15a Prism optical element, 16 Light source control board, EP Eye point, I Air display, F Finger

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
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  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

Selon un mode de réalisation de l'invention, un dispositif d'affichage aérien (1) est équipé d'une feuille rétroréfléchissante (5), d'une pluralité de corps luminescents planaires (32, 4), et d'un miroir semi-transparent (6). Ladite feuille rétroréfléchissante (5) possède une pluralité de trous traversants (5a) présentant des formes s'affichant dans l'air. Ladite pluralité de corps luminescents planaires (32, 4) est disposée côté face envers de ladite feuille rétroréfléchissante (5) pour chaque motif luminescent formé par lesdits trous traversants (5a) de ladite feuille rétroréfléchissante (5). Ledit miroir semi-transparent (6) est disposé d'un côté face d'émission en sortie de ladite feuille rétroréfléchissante (5).
PCT/JP2022/005108 2021-03-12 2022-02-09 Dispositif d'affichage aérien WO2022190751A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08272326A (ja) * 1995-02-08 1996-10-18 Asutei Kk シグナルミラ
US20140226212A1 (en) * 2011-08-02 2014-08-14 De La Rue International Limited Security devices
KR101663757B1 (ko) * 2015-11-27 2016-10-17 (주)이케이엘이디 태양광을 이용한 자체 발광 교통 표지판
JP2017107165A (ja) * 2015-12-07 2017-06-15 国立大学法人宇都宮大学 表示装置及び空中像の表示方法
JP2018081138A (ja) * 2016-11-14 2018-05-24 日本カーバイド工業株式会社 画像表示装置
JP2021144071A (ja) * 2020-03-10 2021-09-24 ミネベアミツミ株式会社 空中表示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08272326A (ja) * 1995-02-08 1996-10-18 Asutei Kk シグナルミラ
US20140226212A1 (en) * 2011-08-02 2014-08-14 De La Rue International Limited Security devices
KR101663757B1 (ko) * 2015-11-27 2016-10-17 (주)이케이엘이디 태양광을 이용한 자체 발광 교통 표지판
JP2017107165A (ja) * 2015-12-07 2017-06-15 国立大学法人宇都宮大学 表示装置及び空中像の表示方法
JP2018081138A (ja) * 2016-11-14 2018-05-24 日本カーバイド工業株式会社 画像表示装置
JP2021144071A (ja) * 2020-03-10 2021-09-24 ミネベアミツミ株式会社 空中表示装置

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