Display device
Patent Information
- Application Number
- JP2023126557
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-08-02
- Publication Date
- 2025-02-14
Smart Images
Figure 2025022197000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a display device that displays an aerial image in space by utilizing retroreflection. [Background technology]
[0002] 2. Description of the Related Art Display devices that perform aerial imaging by retro-reflection (AIRR), which displays an aerial image in space by utilizing retro-reflection, have been known for some time (see, for example, Patent Document 1).
[0003] In other words, a display device using retroreflection comprises a light source, a retroreflecting section, and a light branching section that reflects or transmits light emitted from the light source toward the retroreflecting section, and transmits or reflects the retroreflected light reflected from the retroreflecting section, and displays an aerial image in space.
[0004] In recent years, display devices that perform this type of aerial display have been attracting attention in fields such as communications and broadcasting, entertainment, art, and medicine as display devices that can utilize the environment and space to display images in the air that can be seen without the need for special glasses.
[0005] Furthermore, in a display device that performs an aerial display, it is desirable to increase the display size of the aerial display so that it can be viewed from a distance. [Prior art documents] [Patent documents]
[0006] [Patent Document 1] Patent Publication No. 2021-47440 Summary of the Invention [Problem to be solved by the invention]
[0007] An example of a large display device may be a display device that is installed outdoors (e.g., on a road) and provides public information (e.g., information about the road) (e.g., a traffic information display device that displays traffic information such as no entry signs and warnings).
[0008] A large display device requires a large size retroreflector (retroreflector plate) that acts as a retroreflector, but this has the following disadvantages.
[0009] That is, although it is theoretically possible to produce a retroreflector that is large enough to have no non-retroreflective portions, this is not practical when costs and other factors are taken into consideration.
[0010] 15A and 15B are plan views showing an example and another example of the non-retroreflective portion 40 of the retroreflector 21, respectively.
[0011] As shown in FIG. 15A, polygonal retroreflectors 21 can only be manufactured in small sizes (for example, about 50 cm) due to manufacturing reasons (such as the inability to enlarge the mold). For this reason, in a large display device, it is considered to use a large-sized (for example, 3 m to 4 m) retroreflector 20 composed of a plurality of small-sized retroreflectors 21-21 (formed by joining them together). Also, as shown in FIG. 15B, sheet-shaped retroreflectors 21 can only be manufactured in small widths due to manufacturing problems. For this reason, in a large display device, it is considered to use a large-sized (for example, 3 m to 4 m) retroreflector 20 composed of a plurality of small-sized retroreflectors 21-21 (formed by joining them together).
[0012] Incidentally, in the large-sized retroreflective section 20 constituted by a plurality of small polygonal retroreflectors 21 as shown in Fig. 15A, there are inevitably non-retroreflective sections 40 that do not have a retroreflective function. Similarly, in the large-sized retroreflective section 20 constituted by a plurality of small sheet-like retroreflectors 21 as shown in Fig. 15B, there are also non-retroreflective sections 40.
[0013] In detail, the peripheral parts of the retroreflectors 21 and the joint parts 41 between adjacent retroreflectors 21, 21 do not have a retroreflective function (are not retroreflective), and are visually recognized by the viewer as non-image parts (e.g., black lines) corresponding to the non-retroreflecting parts 40 in the retroreflecting part 20. In this case, the viewer should feel that the aerial image is displayed between the light branching part and the viewer (particularly at the aerial display position) (as if the aerial image is floating), but due to the influence of the non-image parts (e.g., black lines) corresponding to the non-retroreflecting parts 40 in the retroreflecting part 20, the viewer feels that the aerial image is displayed on the retroreflecting part 20 (as if the aerial image is floating) rather than between the light branching part and the viewer (particularly at the aerial display position).
[0014] Therefore, the present invention aims to provide a display device that can easily make the viewer feel as if the aerial image is being displayed between the light branching section and the viewer (particularly at the aerial display position) rather than in the retroreflective section, even if a non-retroreflective section is present in a retroreflective section composed of multiple retroreflectors. [Means for solving the problem]
[0015] In order to solve the above problems, the display device of the present invention is a display device that displays an aerial image in space, comprising a light source, a retroreflective unit, and a light branching unit that reflects or transmits light emitted from the light source toward the retroreflective unit, and transmits or reflects the retroreflective light reflected from the retroreflective unit, wherein the retroreflective unit is composed of a plurality of retroreflectors, and a visual stimulus presentation object is provided between the light branching unit and a viewer viewing the aerial image, and is positioned together with the aerial image in a range that is visible to the viewer. Effect of the Invention
[0016] According to the present invention, even if a non-retroreflective portion is present in a retroreflective portion composed of multiple retroreflectors, it is possible to make the viewer easily perceive the aerial image as being displayed between the optical branching portion and the viewer (particularly at the aerial display position) rather than at the retroreflective portion. [Brief description of the drawings]
[0017] [Figure 1A] 1 is a schematic diagram showing an example of a display device having a basic configuration according to an embodiment of the present invention; [Figure 1B] FIG. 11 is a schematic diagram showing another example of a display device having a basic configuration according to an embodiment of the present invention. [Figure 1C] FIG. 13 is a schematic diagram showing still another example of a display device having a basic configuration according to an embodiment of the present invention. [Figure 2A] 4 is a cross-sectional view showing an example of a retroreflective structure at a joint between adjacent retroreflectors in a retroreflective section. FIG. [Figure 2B] 10 is a cross-sectional view showing another example of a retroreflective structure at a joint portion between adjacent retroreflectors in a retroreflective section. FIG. [Figure 2C] FIG. 2 is a plan view showing a schematic configuration of an example of a retroreflective portion. [Figure 2D] FIG. 2 is a front view illustrating a schematic view of an aerial image viewed by a viewer. [Figure 3A] FIG. 2 is a schematic diagram illustrating one aspect of a guide component, which is an example of a visual stimulus presenter of the display device according to the first embodiment. [Figure 3B] FIG. 2 is a schematic diagram showing another example of a guide component that is an example of a visual stimulus presenter of the display device according to the first embodiment. [Figure 4] 1 is a system block diagram showing a schematic configuration of a display system including a display device according to a first embodiment. [Diagram 5] FIG. 11 is a schematic diagram illustrating a visual aerial image, which is an example of a visual stimulus presentation object of a display device according to a second embodiment. [Figure 6A] 1C is a schematic configuration diagram showing an example of how an aerial image and a visual aerial image are displayed on the display device shown in FIG. 1B. [Figure 6B] 3 is a schematic diagram of a display unit that displays a display image and a visual display image, viewed from the light emission direction. FIG. [Figure 7A] 1C is a schematic configuration diagram showing a first aspect of another example of displaying an aerial image and a visual aerial image on the display device shown in FIG. 1B. FIG. [Figure 7B] 1C is a schematic configuration diagram showing a second mode of another example of displaying an aerial image and a visual aerial image on the display device shown in FIG. 1B. FIG. [Figure 7C] 3 is a schematic diagram of a display section that displays a display image and a visual display section that displays a visual display image, viewed from the light emission direction. FIG. [Figure 8] FIG. 11 is a system block diagram showing a schematic configuration of a display system including a display device according to a second embodiment. [Figure 9A] FIG. 2 is a plan view showing a first embodiment of a graphic image. [Figure 9B] FIG. 11 is a plan view showing a second embodiment of the graphic image. [Figure 9C] FIG. 11 is a plan view showing a third embodiment of a graphic image. [Figure 9D] FIG. 13 is a plan view showing a fourth embodiment of a graphic image. [Figure 9E] FIG. 13 is a plan view showing a fifth embodiment of a graphic image. [Figure 9F] FIG. 13 is a plan view showing a sixth embodiment of a graphic image. [Figure 10A] FIG. 2 is an explanatory diagram for explaining an example in which an aerial image is tilted about a first tilt axis line along the horizontal direction. [Figure 10B] FIG. 13 is an explanatory diagram for explaining another example in which the aerial image is tilted about a first tilt axis line along the horizontal direction. [Figure 11A] FIG. 13 is an explanatory diagram for explaining an example in which the aerial image is tilted about a second tilt axis along the vertical direction. [Figure 11B] FIG. 13 is an explanatory diagram for explaining an example in which the aerial image is tilted about a second tilt axis along the vertical direction. [Figure 12] FIG. 1 is a schematic diagram showing the configuration of a display device used in Experimental Example 1. [Figure 13A] 1 is a table showing the evaluation results in Experimental Example 1. [Figure 13B] 1 is a graph showing the evaluation results in Experimental Example 1. [Figure 14A] 13 is a table showing the evaluation results in Experimental Example 2. [Figure 14B] 13 is a graph showing the evaluation results in Experimental Example 2. [Figure 15A] FIG. 2 is a plan view showing a non-retroreflective portion of an example of a retroreflector. [Figure 15B] 13 is a plan view showing a non-retroreflective portion of another example of a retroreflector. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. The names and functions of the components are also the same. Therefore, detailed description thereof will not be repeated.
[0019] 1A, 1B, and 1C are schematic diagrams showing an example, another example, and yet another example of a display device 100 having a basic configuration according to an embodiment of the present invention, respectively. Note that in the drawings, members having substantially the same configuration are given the same reference numerals.
[0020] As shown in Fig. 1A to Fig. 1C, the display device 100 includes one or more (multiple in this example) light sources 10, a retroreflector 20 (reflector), and a light branching unit 30 (beam splitter in this example). In the display device 100 shown in Fig. 1A and Fig. 1C, the light branching unit 30 reflects the outgoing light L1 to L1 emitted from the light sources 10 toward the retroreflector 20 and transmits the retroreflected light L2 to L2 reflected from the retroreflector 20. In the display device 100 shown in Fig. 1B, the light branching unit 30 transmits the outgoing light L1 to L1 emitted from the light sources 10 toward the retroreflector 20 and reflects the retroreflected light L2 to L2 reflected from the retroreflector 20 toward the aerial display position P.
[0021] 1A to 1C displays an aerial image AI in space. That is, the display device 100 displays an aerial image AI at an aerial display position P symmetrical to the light sources 10 with respect to the optical branching unit 30.
[0022] 1A and 1C, outgoing light L1-L1 emitted from light sources 10-10 is reflected by light branching unit 30, and reflected light L3-L3 reflected by light branching unit 30 is made incident on retroreflection unit 20. Then, reflected light L3-L3 made incident on retroreflection unit 20 is reflected by retroreflection unit 20 in the same direction as the incident direction, and retroreflected light L2-L2 reflected by retroreflection unit 20 is transmitted through light branching unit 30, and an aerial image AI is displayed at aerial display position P symmetrical to light sources 10-10 with respect to light branching unit 30.
[0023] 1B, outgoing light L1-L1 emitted from light sources 10-10 is transmitted through light branching unit 30, and transmitted light L4-L4 transmitted through light branching unit 30 is made incident on retroreflection unit 20. The retroreflected light L2-L2 reflected by retroreflection unit 20 is reflected by light branching unit 30 in the same direction as the incident direction, and an aerial image AI is displayed at aerial display position P symmetrical to light sources 10-10 with respect to light branching unit 30.
[0024] The light sources 10 constitute a display unit 110 having a display surface 111, and a plurality of light sources 10 are arranged in parallel along the display surface 111 in the display unit 110. The display unit 110 displays a display image IM. The number and relative arrangement of the light sources 10 are not particularly limited. In this example, the light sources 10 are light-emitting elements (specifically, light-emitting diodes: LEDs), but are not particularly limited thereto.
[0025] The display device 100 is arranged such that the display unit 110 and the retroreflective unit 20 are arranged so that the light-emitting side of the display unit 110 and the light-reflecting side of the retroreflective unit 20 face each other and are at a predetermined acute angle (see Figures 1A and 1C) or parallel (see Figure 1B).
[0026] The light branching unit 30 is a plate-like member, and in this example, is a beam splitter. However, the light branching unit 30 is not limited to this, and may be, for example, an optical element such as a half mirror.
[0027] FIG. 2A is a cross-sectional view showing an example (20a) of a retroreflective structure at a joint 41 between adjacent retroreflectors 21, 21 in a retroreflective section 20. As shown in FIG.
[0028] As shown in Fig. 2A, the retroreflective section 20 has a conventionally known retroreflective structure 20a. In this example, the retroreflective structure 20a has a plurality of prism elements 201-201. A reflective film 201a is formed on the inclined surfaces (21a1, 21a2)-(21a1, 21a2) of the plurality of prism elements 201-201. The plurality of prism elements 201-201 are connected together along the surface direction F, and the inclined surfaces (21a1, 21a2)-(21a1, 21a2) of the plurality of prism elements 201-201 form the retroreflective surface 21a. A resin layer 202 (top film) is formed on the retroreflective surface 21a.
[0029] In the retroreflective structure 20a shown in Figure 2A, incident light La that has passed through the resin layer 202 is reflected by the reflective film 201a on one inclined surface 21a1, and then is reflected by the reflective film 201a on the other inclined surface 21a2 opposite the one inclined surface 21a1, and the reflected reflected light Lb is emitted in a direction parallel to the incident light La.
[0030] The structure of the retroreflective section 20 is not particularly limited as long as it can reflect light incident on the retroreflective section 20 in the same direction as the incident direction.
[0031] FIG. 2B is a cross-sectional view showing another example ( 20 b ) of the retroreflective structure at joint 41 between adjacent retroreflectors 21 , 21 in retroreflective section 20 .
[0032] As shown in Fig. 2B, the retroreflective section 20 includes a conventionally known retroreflective structure 20b. In this example, the retroreflective structure 20b includes a plurality of solid spherical glass beads 203-203. A reflective film 203a is formed on the lower curved surfaces 21b1-21b1 of the glass beads 203-203. The glass beads 203-203 are connected together along the surface direction F, and the curved surfaces 21b1-21b1 form the retroreflective surface 21b.
[0033] In retroreflective structure 20b shown in FIG. 2B, incident light La is reflected by reflective film 203a on curved surface 21b1 of one glass bead 203, and reflected light Lb is emitted in a direction parallel to the incident light La.
[0034] Materials that can be used for the retroreflective portion 20 are not particularly limited as long as they are retroreflective, and examples thereof include optical glass, polycarbonate (PC) resin, and polymethylmethacrylate resin (PMMA).
[0035] The display device 100 of this embodiment is a large display device (e.g., a traffic information display device that displays traffic information such as no entry signs and caution notices) that is installed outdoors (e.g., on a road) and provides public information (e.g., information related to the road).
[0036] Fig. 2C is a plan view showing a schematic configuration of an example of the retroreflection section 20. Fig. 2D is a front view showing a schematic view of an aerial image AI visually recognized by a viewer S.
[0037] The retroreflective section 20 shown in Fig. 2C is a plate-like large-sized (e.g., 3m to 4m) retroreflective member 21-21 that is made up of a plurality of small-sized (about 50cm in this example) polygonal (hexagonal) retroreflective members 21-21. In this example, the retroreflective member 20 is formed by connecting a plurality of retroreflective members 21-21. Specifically, the retroreflective member 20 is formed by arranging a plurality of retroreflective members 21-21 side by side on a base material 22 (e.g., an acrylic plate) (see Fig. 2C).
[0038] However, in a large-sized retroreflective section 20 composed of a plurality of small-sized retroreflectors 21-21, there are inevitably non-retroreflective sections 40 that do not have a retroreflective function. In detail, the peripheral parts of the retroreflectors 21-21 and the joints 41 between adjacent retroreflectors 21, 21 do not have a retroreflective function (are not retroreflective), and as shown in Fig. 2D, they are visually recognized by a viewer S (see Figs. 1A to 1C) in the aerial image AI as non-image sections AN (e.g., black lines) that correspond to the non-retroreflective sections 40 in the retroreflective section 20. In this case, the viewer S should perceive the aerial image AI as being displayed between the optical branching unit 30 and the viewer S (particularly at aerial display position P (see Figures 1A to 1C)) (as if the aerial image AI is floating), but due to the influence of the non-image area AN (e.g., a black line) (see Figure 2D) corresponding to the non-retroreflective area 40 in the retroreflective unit 20, the viewer S will perceive the aerial image AI as being displayed on the retroreflective unit 20 (see Figures 1A to 1C) (as if the aerial image AI is floating) rather than between the optical branching unit 30 and the viewer S (particularly at aerial display position P).
[0039] In this regard, the display device 100 according to the present embodiment is provided with a visual stimulus presentation object 60 (see FIGS. 1A to 1C ) between the optical branching unit 30 and the viewer S viewing the aerial image AI, the visual stimulus presentation object 60 being arranged in a range that is visible to the viewer S together with the aerial image AI. Here, the visual stimulus presentation object 60 may not obstruct (do not overlap) the aerial image AI, or may obstruct (overlap) it.
[0040] As described above, in this embodiment, the visual stimulus presentation object 60 is provided between the light branching unit 30 and the viewer S, in a range that does not block the aerial image AI and that allows the viewer S to view the aerial image AI together with the aerial image AI, so that the viewer S can be made aware of the presence of the visual stimulus presentation object 60 between the light branching unit 30 and the viewer S. This allows the viewer S to direct his or her attention toward the visual stimulus presentation object 60 while viewing the aerial image AI. Therefore, it is possible to easily make the viewer S feel that the aerial image AI is displayed between the light branching unit 30 and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0041] (First embodiment) 3A and 3B are schematic configuration diagrams respectively showing one form and another form of a guide component 61, which is an example of the visual stimulus presentation object 60 of the display device 100 according to the first embodiment.
[0042] As shown in FIGS. 3A and 3B, in display device 100 according to the present embodiment, visual stimulus presenter 60 includes guide component 61 that can be viewed by viewer S together with aerial image AI.
[0043] In this way, by including the guide component 61 in the visual stimulus presentation object 60, the viewer S can be made aware of the presence of the guide component 61 between the light branching unit 30 and the viewer S with a simple configuration such as using the guide component 61 as the visual stimulus presentation object 60. This allows the viewer S to direct his or her attention to the guide component 61 while viewing the aerial image AI. Therefore, with a simple configuration such as using the guide component 61, it is possible to easily make the viewer S feel that the aerial image AI is displayed not on the retroreflection unit 20 but between the light branching unit 30 and the viewer S (particularly at the aerial display position P).
[0044] Here, the distance d between the aerial image AI and the guide component 61 is not particularly limited as long as it is a distance that allows the viewer S to be aware of the presence of the guide component 61 while viewing the aerial image AI, but can be, for example, 0 cm (the position where the guide component 61 contacts the aerial image AI) or 1 cm or more and 100 cm or less, preferably 70 cm or less, more preferably 50 cm or less, and even more preferably 30 cm or less.
[0045] For example, assuming that the visual stimulus presentation object 60 (e.g., guide component 61) has a size of 1 m and the viewer S views it from a position of 1 m to 100 m, the visual angle of the viewer S is effective if it is within a range of, for example, about 0.5° to 55.0°. The size ratio between the aerial image AI and the visual stimulus presentation object 60 can be, for example, about 1 to 5 times.
[0046] For example, when it is desired to show the aerial image AI to the viewer S at an imaging position 5 m to 30 m from the aerial image AI, the visual angle of the viewer S required for the viewer S to see the visual stimulus presentation object 60 can be in the range of about 2° to 12°. When it is desired to show the aerial image AI to the viewer S at an imaging position 30 m to 80 m from the aerial image AI, the visual angle of the viewer S can be in the range of about 0.7° to 2°. Note that when the viewer S is traveling in a moving body M such as a car, the visual angle of the viewer S decreases as the relative speed of the moving body M with respect to the visual stimulus presentation object 60 (hereinafter simply referred to as the speed of the moving body M) increases, so the visual angle at that time may be limited within the effective range.
[0047] For example, when the speed of the moving body M is 40 km / h, the visual angle of the viewer S can be approximately 100°, and when the speed of the moving body M is 130 km / h, the visual angle of the viewer S can be approximately 30°. If it is desired to show the aerial image AI to the viewer S at an imaging position 5 m to 30 m away from the aerial image AI, it is preferable to determine the size of the visual stimulus presentation object 60 so that the visual angle of the viewer S is within a range of approximately 2° to 12°. When the size of the visual stimulus presentation object 60 is 1 m, the visual angle of the viewer S can be approximately within 30°, and in this case, the visual stimulus presentation object 60 is effective.
[0048] The ratio of the size of the visual stimulus presenting object 60 to the aerial image AI may be, for example, about 0.5 to 5 times.
[0049] The required size of the visual stimulus presentation object 60 varies depending on the position of the visual stimulus presentation object 60 (depending on the visual angle of the viewer S). For example, when the visual stimulus presentation object 60 is located in front of the aerial image AI (about 10 m in front), the size of the visual stimulus presentation object 60 can be exemplified as about 0.5 to 2 times the aerial image AI (the closer the visual stimulus presentation object 60 is to the aerial image AI, the greater the magnification of the visual stimulus presentation object 60 with respect to the aerial image AI). When the visual stimulus presentation object 60 is located between the aerial image AI and the light branching unit 30, including the position of the aerial image AI, the size of the visual stimulus presentation object 60 can be exemplified as 1 to 2 or more times the aerial image AI.
[0050] In this embodiment, the guide component 61 is a structure and / or an image object (a structure in this example). Here, the guide component 61 may not block (do not overlap) the aerial image AI, or may block (overlap) it. This is particularly effective when the guide component 61 is a structure. An example of the structure is a frame body (61a, 61b) surrounding a part or the entire circumference of the aerial image AI. Examples of the frame body surrounding a part or the entire circumference of the aerial image AI include an arc-shaped (arch-shaped) or gate-shaped (gate-shaped) frame body surrounding a part of the upper side, lower side, right side, or left side [in this example, a gate-shaped frame body 61a surrounding the upper side (see FIG. 3A)], and a circular, elliptical, or polygonal frame body [in this example, a square-shaped frame body 61b (see FIG. 3B)]. Another example of the structure is a rod-shaped object such as a pole installed next to the aerial image AI. Examples of image objects include image objects such as frame images displayed on a display device such as a monitor, and image objects such as frame images projected by a projection mapping device that projects images such as computer graphics.
[0051] In this way, since the guide component 61 is the structure (61a, 61b) or the image object, it is possible to easily make the viewer S aware of the presence of the structure (61a, 61b) or the image object between the light branching unit 30 and the viewer S. This makes it possible to easily direct the viewer S's awareness toward the structure (61a, 61b) or the image object while allowing the viewer S to view the aerial image AI. Therefore, with a simple configuration such as using the structure (61a, 61b) or the image object, it is possible to more easily make the viewer S feel that the aerial image AI is displayed between the light branching unit 30 and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0052] In detail, the aerial image AI (in this example, characters warning people) is located on a road G, and the frame bodies (61a, 61b) are installed on an installation surface E via support members 70 (pillars) so as to surround the aerial image AI.
[0053] FIG. 4 is a system block diagram showing a schematic configuration of a display system 200 including the display device 100 according to the first embodiment.
[0054] As shown in FIG. 4, the display system 200 includes a command unit 210 (command control device) and the display device 100.
[0055] The command unit 210 transmits command signals to the display device 100 and is provided in a command center. The command unit 210 transmits information related to the display contents to the display device 100 via communication means such as a wired and / or wireless communication network. The command unit 210 is capable of forcibly changing the display contents on the display device 100 in the event of an emergency such as a disaster, for example.
[0056] The display device 100 further includes a control unit 120 , an environment sensor unit 140 , and an object sensor unit 150 .
[0057] The control unit 120 has a processing unit 120a consisting of a computer such as a CPU (Central Processing Unit), and a storage unit 120b including a non-volatile memory such as a ROM (Read Only Memory) and a volatile memory such as a RAM (Random Access Memory). The control unit 120 controls the operation of various components by the processing unit 120a loading a control program stored in advance in the ROM of the storage unit 120b onto the RAM of the storage unit 120b and executing it.
[0058] The display unit 110 includes a display device such as a liquid crystal display or an organic electroluminescence display. The display unit 110 is electrically connected to an output system of the control unit 120, and a display signal related to a display image IM is input from the control unit 120. This allows the display unit 110 to display the display image IM on the display unit 110 in response to the display signal from the control unit 120.
[0059] The environment sensor unit 140 is electrically connected to an input system of the control unit 120, and transmits an environment signal indicating the environment, such as the brightness of the surroundings, to the control unit 120. This allows the control unit 120 to detect (recognize) the environment, such as the brightness of the surroundings, based on the environment signal from the environment sensor unit 140. However, if the surroundings are dark, it is not necessary to make the display unit 110 brighter than necessary. For this reason, for example, when the control unit 120 determines that the surroundings are darker than the reference brightness based on the environment signal from the environment sensor unit 140, it reduces the brightness (luminance) of the display unit 110.
[0060] The objective sensor unit 150 is electrically connected to an input system of the control unit 120, and transmits a detection signal that detects detection information such as the presence or absence of a viewer S or a moving body M such as a car carrying the viewer S to the control unit 120. This allows the control unit 120 to detect (recognize) detection information such as the presence or absence of the moving body M from the detection signal from the objective sensor unit 150. However, if there is no viewer S, there is no need to display the display unit 110. For this reason, for example, when the control unit 120 determines that there is no moving body M (viewer S) based on the detection signal from the objective sensor unit 150, it stops driving the display unit 110.
[0061] In this embodiment, the display device 100 is provided with a moving device (not shown) that moves the guide component 61 in a cross direction (e.g., a perpendicular direction) that intersects with the optical axis direction of the retroreflected light L2, and the moving device may be electrically connected to the output system of the control unit 120.
[0062] In this case, the moving device can be, for example, a rotation device (a device including a rotation drive unit (e.g., a drive motor)) that rotates the guide component 61 in a rotation direction along the intersecting direction. In this configuration, a moving device that moves the guide component 61 in the intersecting direction can be easily realized with a simple configuration such as a rotation device.
[0063] Also, a function for detecting the speed of the moving object M may be added, and the movement of the guide component 61 may be changed according to the speed of the moving object M.
[0064] Second embodiment Fig. 5 is a schematic diagram showing a visual aerial image AIA, which is an example of a visual stimulus presentation object 60 of the display device 100 according to the second embodiment. Fig. 6A is a schematic diagram showing an example of displaying the aerial image AI and the visual aerial image AIA in the display device 100 shown in Fig. 1B, and Fig. 6B is a schematic diagram showing the display unit 110 displaying the display image IM and the visual display image IMA, viewed from the light emission direction.
[0065] In addition, Figures 7A and 7B are schematic configuration diagrams showing a first and a second embodiment, respectively, of another example of displaying an aerial image AI and a visual aerial image AIA on the display device 100 shown in Figure 1B, and Figure 7C is a schematic diagram of the display unit 110 displaying the display image IM and the visual display unit 110A displaying the visual display image IMA, viewed from the light emission direction.
[0066] In the second embodiment, the configurations that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
[0067] As shown in Figs. 5, 6A, 7A, and 7B, the visual stimulus presentation object 60 includes a visual aerial image AIA that can be viewed by the viewer S together with the aerial image AI. The visual aerial image AIA is an aerial image separate from the aerial image AI. In the display device 100, the control unit 120 further displays a visual aerial image AIA (61) in space. That is, the control unit 120 further displays a visual aerial image AIA (60) at a visual aerial display position Q (aerial display position Q for visual recognition including aerial display position P) (see Figs. 6A, 7A, and 7B) symmetrical to the visual light sources 10A-10A with respect to the optical branching unit 30.
[0068] The control unit 120 may display the visual display image IMA together with the display image IM on the display unit 110 as shown in Fig. 6B, or may display the visual display image IMA on a visual display unit 110A provided separately from the display unit 110 as shown in Fig. 7C. When the control unit 120 displays the visual display image IMA on the display unit 110, the visual aerial display position Q is the same as the aerial display position P (see Fig. 6A). When the control unit 120 displays the visual display image IMA on the visual display unit 110A, the visual aerial display position Q is the same as the aerial display position P or a position different from the aerial display position P (see Figs. 7A and 7B).
[0069] In this way, since the visual stimulus presentation object 60 includes the visual aerial image AIA, the visual stimulus presentation object 60 can be configured to make the viewer S aware of the presence of the visual aerial image AIA (60) between the light branching unit 30 and the viewer S with a simple configuration in which the visual aerial image AIA is used as the visual stimulus presentation object 60. This makes it possible to direct the viewer S's attention toward the visual aerial image AIA (60) while visually recognizing the aerial image AI. Moreover, since the visual aerial image AIA (60) is displayed using the visual display image IMA generated by the control unit 120, any visual image can be easily generated by the control unit 120. Therefore, various aspects of the visual aerial image AIA (60) can be quickly and easily changed.
[0070] That is, in display device 100 shown in Fig. 6A, control unit 120 displays display image IM on display unit 110 (see Fig. 6B) to display it at aerial display position P of aerial image AI, and also displays visual display image IMA on display unit 110 to display visual aerial image AIA (60) at visual aerial display position Q that is the same as aerial display position P. In this way, there is no need to provide a display unit separate from display unit 110. In this example, display device 100 shown in Fig. 6A has a larger screen size of display unit 110 than display device 100 shown in Fig. 1B.
[0071] In addition, in the display device 100 shown in Figures 7A and 7B, the control unit 120 displays the display image IM on the display unit 110 (see Figure 7C) to display it at an aerial display position P of the aerial image AI, and also displays the visual display image IMA on the visual display unit 110A to display the visual aerial image AIA (60) at a visual aerial display position Q that is the same as the aerial display position P or at visual aerial display positions Q(-), Q(+) that are different from the aerial display position P.
[0072] More specifically, the display device 100 shown in FIG. 7A further includes visual light sources 10A--10A that are provided separately from the light sources 10--10.
[0073] 7A, the light branching unit 30 transmits the emitted light L1-L1 emitted from the visibility light sources 10A-10A toward the retroreflection unit 20, and reflects the retroreflected light L2-L2 reflected from the retroreflection unit 20. Here, the display unit 110 and the visibility display unit 110A are arranged so that their optical axes coincide with each other.
[0074] In the display device 100 shown in FIG. 7A, the outgoing light beams L1-L1 emitted from the light sources for visibility 10A-10A are transmitted through the light branching unit 30, and the transmitted light beams L4-L4 transmitted through the light branching unit 30 are made incident on the retroreflection unit 20. The retroreflected light beams L2-L2 reflected by the retroreflection unit 20 are reflected in the same direction as the incident direction by the retroreflection unit 20, and are reflected by the light branching unit 30 to display an aerial image for visibility AIA (60) at an aerial display position Q for visibility symmetrical to the light sources for visibility 10A-10A with respect to the light branching unit 30. When the configuration according to the second embodiment is applied to the display device 100 shown in FIG. 1A, the outgoing light beams L1-L1 emitted from the light sources for visibility 10A-10A are reflected by the light branching unit 30, and the reflected light beams L3-L3 reflected by the light branching unit 30 are made incident on the retroreflection unit 20. The retroreflective light L2~L2 reflected by the retroreflective unit 20 is reflected in the same direction as the incident direction, and the retroreflective light L2~L2 reflected by the retroreflective unit 20 is made incident on the optical branching unit 30, so that aerial image AIA (60) for visibility can be displayed at aerial display position Q for visibility that is symmetrical to the optical light sources 10A~10A for visibility with respect to the optical branching unit 30.
[0075] The display device 100 is arranged so that the visual display unit 110A and the retroreflective unit 20 are arranged such that the light emission side of the visual display unit 110A and the light reflection side of the retroreflective unit 20 face each other and are parallel (at a predetermined acute angle when applied to the display device 100 shown in Figure 1A).
[0076] The display device 100 shown in FIG. 7B further includes visual recognition light sources 10A provided separately from the light sources 10 and a visual recognition light branching section 30A provided separately from the light branching section 30. The display device 100 shown in FIG.
[0077] 7B, the visibility light branching unit 30A transmits the emitted light L1-L1 emitted from the visibility light sources 10A-10A toward the retroreflection unit 20, and reflects the retroreflected light L2-L2 reflected from the retroreflection unit 20. Here, the display unit 110 and the visibility display unit 110A are arranged so that their optical axes are different from each other.
[0078] In the display device 100 shown in Fig. 7B, the emitted light L1-L1 emitted from the visibility light sources 10A-10A is transmitted through the visibility light branching unit 30A, and the transmitted light L4-L4 transmitted through the visibility light branching unit 30A is made incident on the retroreflection unit 20. The retroreflected light L2-L2 reflected by the retroreflection unit 20 is reflected by the visibility light branching unit 30A in the same direction as the incident direction, and an aerial image for visibility AIA (60) is displayed at an aerial display position Q for visibility symmetrical to the visibility light sources 10A-10A with respect to the visibility light branching unit 30A.
[0079] As shown in Figures 7A and 7B, the visual light sources 10A-10A constitute a visual display unit 110A having a display surface 111A, and a plurality of the visual light sources 10A are arranged in parallel along the display surface 111A of the visual display unit 110A. The number and relative arrangement of the visual light sources 10A are not particularly limited. In this example, the visual light sources 10A are light-emitting elements (specifically, light-emitting diodes: LEDs), but are not particularly limited.
[0080] As shown in FIG. 7C, the visual display section 110A is formed in a frame shape so as to surround the display section 110.
[0081] FIG. 8 is a system block diagram showing a schematic configuration of a display system 200 including a display device 100 according to the second embodiment.
[0082] The visual display unit 110A includes a display device such as a liquid crystal display or an organic electroluminescence display. The visual display unit 110A is electrically connected to an output system of the control unit 120, and a display signal related to the visual display image IMA is input from the control unit 120. This allows the control unit 120 to display the visual display image IMA on the visual display unit 110A according to the display signal from the control unit 120.
[0083] For example, when the control unit 120 determines that the surroundings are darker than the reference brightness based on the environmental signal from the environment sensor unit 140, it reduces the brightness (luminance) of the visual confirmation display unit 110A. Also, when the control unit 120 determines that there is no moving object M (viewer S) based on the detection signal from the object sensor unit 150, it stops driving the visual confirmation display unit 110A.
[0084] However, if an image showing confusing information (for example, when both the aerial image AI and the aerial image for visual recognition AIA (60) are text information) is displayed as the visual aerial image AIA (60) in relation to the information shown in the aerial image AI, the viewer S may misunderstand the information shown in the aerial image AI.
[0085] In this regard, in the present embodiment, the visual aerial image AIA (60) is a graphic image AIAa having a predetermined shape. The predetermined shape is not particularly limited, but examples thereof include polygonal shapes such as a triangle or a rectangle, a circle, an ellipse, and the like.
[0086] In this way, it is possible to display an image that is meaningless in relation to the information shown in the aerial image AI, and therefore it is possible to avoid displaying an image that shows confusing information in relation to the information shown in the aerial image AI as the visual aerial image AIA (60), thereby preventing the viewer S from misunderstanding the information shown in the aerial image AI.
[0087] 9A to 9F are plan views showing first to sixth aspects of the graphic image AIAa, respectively.
[0088] In this embodiment, the graphic image AIAa is a frame image AIAa1 (a rectangular frame image in this example) surrounding the aerial image AI. In this embodiment, the control unit 120 statically displays the graphic image AIAa (see FIG. 9A).
[0089] In this way, since the graphic image AIAa is a frame image AIAa1 surrounding the aerial image AI, the viewer S can be made more aware of the presence of the frame image AIAa1 (AIAa) between the light branching unit 30 and the viewer S. This allows the viewer S to further direct his or her attention toward the frame image AIAa1 (AIAa) while viewing the aerial image AI. This makes it easier for the viewer S to feel that the aerial image AI is displayed between the light branching unit 30 and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0090] In this embodiment, the graphic image AIAa is an image AIAa2 of two straight lines (two straight line images parallel to each other) with the aerial image AI therebetween (two-line image: see FIG. 9D).
[0091] In this way, since the graphic image AIAa is two straight line images AIAa2 with the aerial image AI between them, the viewer S can be made more aware of the presence of the two straight line images AIAa2 between the light branching unit 30 and the viewer S. This allows the viewer S to further direct his or her attention to the two straight line images AIAa2 while viewing the aerial image AI. This makes it easier for the viewer S to feel that the aerial image AI is displayed between the light branching unit 30 and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0092] In this embodiment, the control unit 120 causes the graphic image AIAa to blink (see FIG. 9B). That is, the control unit 120 causes the graphic image AIAa to be displayed so that the entire graphic image AIAa blinks. Here, the time from when the graphic image AIAa is turned on to when it is turned off can be, but is not limited to, about 0.05 to 10 seconds, and the time from when the graphic image AIAa is turned off to when it is turned on can be, but is not limited to, about 0.05 to 10 seconds.
[0093] In this way, by the control unit 120 flashing the graphic image AIAa, the viewer S can be made more aware of the graphic image AIAa between the light branching unit 30 and the viewer S. This allows the viewer S to be more conscious of the graphic image AIAa while viewing the aerial image AI. Therefore, it is possible to make the viewer S more easily perceive the aerial image AI as being displayed between the light branching unit and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0094] The speed of the moving object M may be, for example, 0km / h to 40km / h in the case of a mistaken no entry sign (entrance or exit), and 60km / h to 120km / h in the case of a sign on a highway. The speed of change of the display of the graphic image AIAa may be made faster as the speed of the moving object M increases, or may be made slower as the speed of the moving object M decreases. This makes it possible to further enhance the vection effect.
[0095] In this embodiment, the control unit 120 rotates and displays the graphic image AIAa (see FIG. 9C). That is, the control unit 120 displays the graphic image AIAa so that the entire graphic image AIAa rotates. Here, the number of rotations per unit time of the graphic image AIAa is not limited to, but can be exemplified as about 1 rpm to 600 rpm (diameter of the graphic image AIAa: about 1.5 m). Here, rpm (rotations per minute) means the number of rotations per minute.
[0096] The rotation speed per unit time of the graphic image AIAa can be, for example, approximately 1 rpm to 200 rpm (diameter of the graphic image AIAa: approximately 1.5 m) when the speed of the moving body M is 0 km / h to 40 km / h, and can be approximately 200 rpm or more (diameter of the graphic image AIAa: approximately 1.5 m) when the speed of the moving body M is 60 km / h to 120 km / h.
[0097] In this way, the control unit 120 rotates and displays the graphic image AIAa, thereby making the viewer S more aware of the graphic image AIAa between the light branching unit 30 and the viewer S. This allows the viewer S to more easily direct his or her attention to the graphic image AIAa while viewing the aerial image AI. Therefore, it is possible to make the viewer S more easily perceive the aerial image AI as being displayed between the light branching unit and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0098] In this embodiment, the control unit 120 displays the graphic image AIAa so that the graphic image AIAa flows in a predetermined flow direction (flow display: see FIG. 9D). That is, the control unit 120 displays the graphic image AIAa so that a part (e.g., light and shade) flows in a predetermined flow direction (e.g., vertical direction X, horizontal direction Y). Here, the moving speed of the graphic image AIAa is not limited to this, but can be about 0.01 m / s (m / sec) to 10 m / s.
[0099] In this way, the control unit 120 displays the graphic image AIAa so that the graphic image AIAa flows in a predetermined flow direction (X, Y), thereby making the viewer S more aware of the graphic image AIAa between the light branching unit 30 and the viewer S. This allows the viewer S to be more conscious of the graphic image AIAa while viewing the aerial image AI. Therefore, it is possible to make the viewer S more easily perceive the aerial image AI as being displayed between the light branching unit 30 and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0100] In this embodiment, the control unit 120 displays the graphic image AIAa so that the magnification repeatedly changes (in this example, so that it gradually increases or decreases) between an enlarged image of the graphic image AIAa of a predetermined first reference size at a predetermined first enlargement magnification and a reduced image of the graphic image AIAa of a predetermined first reduction magnification (enlargement / reduction display: see Figs. 9E and 9F). Here, the first enlargement magnification and first reduction magnification of the graphic image AIAa can be, but are not limited to, approximately 1% to 200% with the predetermined first reference size being 100%.
[0101] In this way, by displaying the graphic image AIAa so that the magnification is repeatedly changed between the enlarged image of the graphic image AIAa and the reduced image of the graphic image AIAa, the viewer S can be made more aware of the graphic image AIAa located between the light branching unit 30 and the viewer S. This allows the viewer S to be more conscious of the graphic image AIAa while viewing the aerial image AI. Therefore, it is possible to make the viewer S more easily perceive that the aerial image AI is displayed between the light branching unit 30 and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0102] In this embodiment, the control unit 120 may display the aerial image AI so that the magnification repeatedly changes (in this example, gradually increases or decreases) between an enlarged image of the aerial image AI of a predetermined second reference size at a predetermined second enlargement magnification and a reduced image of the aerial image AI at a predetermined second reduction magnification (enlarged or reduced display: see Figure 9F).
[0103] This makes it possible to make the viewer S more aware of the graphic image AIAa between the light branching unit 30 and the viewer S. This allows the viewer S to be more conscious of the graphic image AIAa while viewing the aerial image AI. Therefore, it is possible to make the viewer S more easily perceive that the aerial image AI is displayed between the light branching unit 30 and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0104] For example, the control unit 120 can set the aerial image AI to a reduced image at a second reduction magnification when the graphical image AIAa is an enlarged image at a first reduction magnification, and can set the aerial image AI to an enlarged image at a second reduction magnification when the graphical image AIAa is a reduced image at the first reduction magnification (enlarged / reduced display: see Figure 9F).
[0105] In this case, the viewer S can be made more aware of the graphic image AIAa between the light branching unit 30 and the viewer S. This allows the viewer S to further direct his or her attention to the graphic image AIAa while visually viewing the aerial image AI. This makes it easier for the viewer S to sense that the aerial image AI is displayed between the light branching unit 30 and the viewer S (particularly at the aerial display position P) rather than on the retroreflection unit 20.
[0106] Here, the change in the graphic image AIAa between the first and second enlargement magnifications and the first and second reduction magnifications may be accelerated as the speed of the moving body M increases, or may be decelerated as the speed of the moving body M decreases. For example, but not limited to, when the speed of the moving body M is 0 km / h (km / hour) to 40 km / h, the speed may be 1% / s to 100% / s for the first reference size of the graphic image AIAa and 1% / s to 100% / s for the second reference size of the aerial image AI, and when the speed of the moving body M is 60 km / h to 120 km / h, the speed may be 100% / s or more for the predetermined first reference size of the graphic image AIAa and 100% / s or more for the predetermined second reference size of the aerial image AI.
[0107] 10A and 10B are explanatory diagrams for explaining one example and another example, respectively, of tilting the aerial image AI around the first tilt axis α.
[0108] The control unit 120 tilts the aerial image AI (i.e., the screen of the display unit 110) with respect to a reference plane γ about a first tilt axis α along the horizontal direction W. Here, the reference plane γ is a plane perpendicular to the optical axis of the retroreflected light L2.
[0109] For example, as shown in FIG. 10A, the control unit 120 tilts the aerial image AI about a first tilt axis α so that the upper side of the aerial image AI appears in the back and the lower side appears in the front when viewed from the viewer S side.
[0110] By doing this, the sense of distance from the bottom (near) to the top (far) can be emphasized to the viewer S based on the human perception characteristics [characteristics of the vertical direction V of the horopter (a surface that is perceived as equidistant)]. Also, just like when a person looks far away on the road, the bottom of the field of view is closer and the higher up the field of view is the farther away, so information can be presented with a natural sense of depth.
[0111] Furthermore, the control unit 120 tilts the aerial image AI about the first tilt axis α so that the upper side of the aerial image AI is in the front and the lower side is in the back when viewed from the viewer S side, as shown in FIG. 10B.
[0112] By doing this, in the opposite way to when a person looks far away on the road, the lower part of the field of view is far away and the higher the field of view is, the closer it gets, so in the case of AR (Augmented Reality) display where the background of the aerial image AI can be observed, the floating feeling of the aerial image AI can be emphasized especially in the upper part. Also, when the aerial image AI is installed above the viewpoint position of the driver (viewer S), the viewing angle (apparent size) can be made larger.
[0113] 11A and 11B are diagrams illustrating an example in which the aerial image AI is tilted about the second tilt axis β.
[0114] The control unit 120 tilts the aerial image AI (that is, the screen of the display unit 110) about a second tilt axis β along the vertical direction V with respect to the reference plane γ.
[0115] For example, the control unit 120 tilts the aerial image AI about the second tilt axis β so that the right side of the aerial image AI becomes the back and the left side becomes the front. Also, the control unit 120 tilts the aerial image AI about the second tilt axis β so that the right side of the aerial image AI becomes the front and the left side becomes the back.
[0116] In this way, by tilting the aerial image AI around the second tilt axis β, the focus of the display can be shifted from the front to the back when viewed by the driver (viewer S), thereby providing an additional effect of visual guidance.
[0117] The specific values shown in the above-described embodiment are merely examples for understanding the embodiment, and are not particularly limited. The same applies to the experimental examples described below.
[0118] [Experimental Example] Next, an evaluation experiment was carried out on the display device 100 according to the present embodiment, and the details thereof will be described below.
[0119] That is, in this experimental example, six subjects (viewers S) were examined as to whether the aerial image AI appeared to be displayed between the optical branching section 30 and the viewer S (whether it appeared to be floating) or whether it appeared to be displayed on the retroreflective section 20 (whether it appeared to be floating).
[0120] Fig. 12 is a schematic diagram showing the configuration of display device 100 used in Experimental Example 1. As shown in Fig. 12, display device 100 used in Experimental Example 1 was provided with a rectangular frame body 61b that surrounded the entire periphery of aerial image AI in display device 100 having the basic configuration shown in Fig. 1B.
[0121] (Configuration of display device 100) The optical branching section 30 used was a beam splitter made of a glass material with a thickness of 5 mm, a size of 1800 mm×900 mm, and a refractive index of 1.52.
[0122] As the retroreflective section 20, 28 retroreflectors (retroreflective elements) of 500 mm square were attached to an acrylic plate that was the base material 22. In the experimental example, the retroreflective section 20 configured as follows was used.
[0123] Experimental example: A retroreflective portion 20 with a joint 41 width of 0.5 mm was used.
[0124] (Experimental conditions) The subjects (S) were asked to view the aerial image AI from observation positions that were 10 m and 15 m away from the aerial display position P by an observation distance H.
[0125] <Experimental Example 1> In experimental example 1, the observation conditions of the aerial image AI by the subject (S) were compared in the following cases: when there was no frame body 61b surrounding the entire circumference of the aerial image AI; when the frame body 61b was positioned at a visual aerial display position Q that was the same as aerial display position P; when the frame body 61b was positioned at a visual aerial display position Q(-) away from the aerial display position P by a distance K of 1 m on the opposite side of the subject (S) from the aerial display position P; and when the frame body 61b was positioned at a visual aerial display position Q(+) away from the aerial display position P by 1 m each at distances of 1 m to 5 m on the subject (S) side.
[0126] (Evaluation Results of Experimental Example 1) 13A and 13B are a table and a graph, respectively, showing the evaluation results in Experimental Example 1.
[0127] In addition, in Figures 13A and 13B, if the subject (S) answered that the aerial image AI appears to be displayed (appears to be floating) at the visual aerial display positions Q(-), Q(+) (except when the frame 61b is positioned at the same visual aerial display position Q as the aerial display position P), the mark was marked "◎", if the subject (S) answered that the aerial image AI appears to be displayed (appears to be floating) at the aerial display position P, the mark was marked "◯", if the subject (S) answered that the aerial image AI appears to be displayed at a position between the aerial display position P and the optical branching section 30 (appears to be floating), the mark was marked "△", and if the subject (S) answered that the aerial image AI appears to be displayed at the position of the retroreflective section 20 (does not appear to be floating), the mark was marked "X".
[0128] The "proportion of people who answered that it looked like it was floating" in Figures 13A and 13B is the ratio of the number of subjects (S) who answered that the aerial image AI looked like it was floating ("◎", "O", "△") to the total number of six subjects (S). The overall evaluation score is the sum of the evaluation scores of the six subjects (S), with "◎", "O", "△", and "×" being 3 points, 2 points, 1 point, and 0 point, respectively.
[0129] 13A and 13B, the proportion of subjects (S) who answered that the aerial image AI appeared to be floating increased when the frame body 61b was placed compared to when the frame body 61b was not placed. Therefore, it was found that placing the frame body 61b was effective.
[0130] <Experimental Example 2> In experimental example 2, a display device with the basic configuration shown in Figure 7A was used, and a comparison was made between a case in which there was no frame image AIAa1 surrounding the aerial image AI, and a case in which the frame image AIAa1 was positioned at the same visual aerial display position Q as the aerial display position P, and the frame image AIAa1 was displayed as a static image and a rotating image at 30 rpm (diameter of graphic image AIAa approximately 1.5 m) (2.33 m / s) (period 2.0 seconds).
[0131] (Evaluation results of Experimental Example 2) 14A and 14B are a table and a graph, respectively, showing the evaluation results in Experimental Example 2.
[0132] In Figures 14A and 14B, if the subject (S) answered that the aerial image AI appears to be displayed at the aerial display position P (appears to be floating), the mark was marked "O." If the subject (S) answered that the aerial image AI appears to be displayed at a position between the aerial display position P and the optical branching section 30 (appears to be floating), the mark was marked "△." If the subject (S) answered that the aerial image AI appears to be displayed at the position of the retroreflective section 20 (does not appear to be floating), the mark was marked "X."
[0133] 14A and 14B, the "proportion of people who answered that it looked like it was floating" is the ratio of the number of subjects (S) who answered that the aerial image AI looked like it was floating ("Good" or "Critical") to the total number of six subjects (S). The overall evaluation score is the sum of the evaluation scores of the six subjects (S), with "Good", "Critical", and "X" being 2 points, 1 point, and 0 point, respectively.
[0134] As shown in Figures 14A and 14B, the percentage of subjects (S) who answered that the aerial image AI appeared to float increased when the frame image AIAa1 was displayed compared to when it was not. This shows that displaying the frame image AIAa1 is effective. It also shows that rotating the frame image AIAa1 is more effective than displaying it still.
[0135] The present invention is not limited to the above-described embodiment, but can be embodied in various other forms. Therefore, the embodiment is merely illustrative in all respects and should not be interpreted as being restrictive. The scope of the present invention is defined by the claims, and is not limited in any way by the text of the specification. Furthermore, all modifications and changes within the scope of the claims are within the scope of the present invention. [Explanation of symbols]
[0136] 10 light source 100 display device 10A Vision light source 110 Display section 110A Visual display unit 111 Display surface 111A Display surface 120 Control section 120a Processing section 120b Storage section 140 Environmental Sensor Section 150 Object sensor part 20 Retroreflective section 200 Display System 20a Retroreflective structure 20b Retroreflective structure 21 Retroreflector 210 Command Department 21a Retroreflective surface 21a1 Slope 21a2 Slope 21b Retroreflective surface 21b1 Curved surface 22 Base material 30 Optical branching section 30A Visual light branch 40 Non-retroreflective section 41 Joint 60 Visual Stimuli Presentation 61 Guide Components 61a Gate-shaped frame 61b Polygonal frame 70 Support member AI aerial image AIA Visual Aerial Image AIAa1 Frame Image AIAa2 Linear image AN Non-image section E Installation surface F plane direction G road H Observation distance IM Display Image IMA Visual Display Image K separation distance L1 output light L2 Retroreflective light L3 reflected light L4 transmitted light La incident light Lb reflected light M Mobile object P Aerial display position Q Visual aerial display position S. Viewer V vertical direction W horizontal direction X vertical direction Y Horizontal d Distance α 1st tilt axis β 2nd tilt axis γ reference plane
Claims
1. A display device that displays an aerial image at an aerial display position in a space, the display device comprising: a light source; a retroreflector; and a light branching unit that reflects or transmits light emitted from the light source toward the retroreflector and transmits or reflects retroreflected light reflected from the retroreflector, The retroreflective portion is composed of a plurality of retroreflectors, A display device characterized in that a visual stimulus presenting object is provided between the optical branching unit and a viewer viewing the aerial image, the visual stimulus presenting object being positioned together with the aerial image in a range that can be viewed by the viewer.
2. The display device according to claim 1 , A display device characterized in that the visual stimulus presentation includes a guide component that the viewer can view together with the aerial image.
3. The display device according to claim 2, A display device, characterized in that the guide component is a structure and / or an image object.
4. The display device according to claim 1 , the visual stimulus presentation includes a visual aerial image that is viewable by the viewer together with the aerial image, The display device further displays the visual aerial image within the space.
5. The display device according to claim 4, The display device further includes a light source for visual recognition provided separately from the light source, The display device is characterized in that the light branching section reflects or transmits the outgoing light emitted from the visual light source toward the retroreflection section, and transmits or reflects the retroreflected light reflected from the retroreflection section.
6. The display device according to claim 4, The display device further includes a visual light source provided separately from the light source, and a visual light branching unit provided separately from the light branching unit, The display device is characterized in that the visual recognition light branching section transmits light emitted from the visual recognition light source toward the retroreflection section and reflects retroreflected light reflected from the retroreflection section.
7. The display device according to claim 5 or 6, 13. A display device according to claim 12, wherein the visual aerial image is a graphic image of a predetermined shape.
8. The display device according to claim 7, 13. A display device according to claim 12, wherein the graphic image is a frame image surrounding the aerial image.
9. The display device according to claim 7, 13. A display device according to claim 12, wherein the graphic image is an image of two straight lines with the aerial image therebetween.
10. The display device according to claim 7, A display device which displays the graphic image in a blinking manner.
11. The display device according to claim 7, A display device which rotates and displays the graphic image.
12. The display device according to claim 7, A display device which displays the graphic image so that the graphic image flows in a predetermined flow direction.
13. The display device according to claim 7, A display device characterized in that the graphic image is displayed so that the magnification is repeatedly changed between an enlarged image of the graphic image of a predetermined first reference size at a predetermined first enlargement ratio and a reduced image of the graphic image at a predetermined first reduction ratio.
14. The display device according to claim 13, A display device that displays an aerial image of a predetermined second reference size so that the magnification is repeatedly changed between an enlarged image of the aerial image at a predetermined second magnification and a reduced image of the aerial image at a predetermined second reduction magnification.
15. The display device according to claim 14, when the graphic image is an enlarged image at the first enlargement ratio, the aerial image is a reduced image at the second reduction ratio; 13. A display device comprising: a display unit for displaying a display image of a display device according to claim 12, wherein said display unit displays said aerial image as an enlarged image at said second enlargement magnification when said graphic image is a reduced image at said first reduction magnification.
16. The display device according to claim 1 , A display device, characterized in that the aerial image is tilted about a first tilt axis line that is parallel to a reference plane perpendicular to an optical axis of the retroreflected light.
17. The display device according to claim 1 , The display device according to claim 1, wherein the aerial image is tilted about a second tilt axis line along a vertical direction with respect to a reference plane perpendicular to an optical axis of the retroreflected light.
Citation Information
Patent Citations
Display device and display method of aerial image
JP2021047440A