Light guide plate, display device, game machine, and vehicle-mounted display

Abstract

The invention provides a light guide plate with high transparency, a display device, a game machine, and a vehicle-mounted display. The light guide plate (10A) includes: an incident surface (11a) on which light from the light source (20) is incident; an emission surface (11c) for emitting light; and a plurality of light deflectors (12) that cause light incident from the incident surface and guided to exit from the exit surface, the light deflectors being disposed on an array line (13) that is a linear array region, and at least one array line including a region that is not parallel to the incident surface.

Description

Technical Field

[0001] The present disclosure relates to a light guide plate, a display device, a game console, and a vehicle-mounted display for displaying a parallax-based stereoscopic image. Background Art

[0002] Patent document 1 discloses a light guide plate for displaying a parallax-based stereoscopic image. Light from a light source enters the light guide plate through a side surface, i.e., an incident surface, and the light guide plate includes a plurality of deflection portions having inclined surfaces corresponding to each row parallel to the incident surface, and the inclined surfaces reflect the light guided while being totally reflected inside the light guide plate and emit it from an exit surface. The direction of the inclined surface of each row changes according to the distance from the incident surface.

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-139176 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, although the details will be described later, in the light guide plate of Patent Document 1, in the area where a stereoscopic image close to the incident plane is displayed, the line interval of the deflection part for displaying the stereoscopic image must be narrowed. In such an area, there is a problem that the transparency of the light guide plate decreases due to the increase in the density of the deflection part. In addition, in the case of wanting to display a stereoscopic image with a very high degree of parallelism to the incident plane, there is also a problem that it is difficult to display the stereoscopic image as a continuous line image.

[0008] An object of one embodiment of the present disclosure is to realize a light guide plate or the like that can clearly display a three-dimensional image that is parallel and close to an incident surface and has high transparency.

[0009] [Technical means to solve the problem]

[0010] In order to solve the above problem, a light guide plate of one embodiment of the present disclosure displays a parallax-based stereoscopic image, the light guide plate comprising: an incident surface, through which light from a light source is incident; an exit surface, through which the light is exited; and a plurality of light deflecting units, which deflect the light incident from the incident surface and guided by the light, thereby causing the light to exit from the exit surface, the plurality of light deflecting units being arranged on an arrangement line as a linear arrangement area, if the first exit light deflected by the light deflecting unit is emitted toward an angle range irradiated to one eye of an observer observing the exit surface from a specified range of observation space and its vicinity, The point on the exit surface is set as the first exit point, and the point on the exit surface that emits the second exit light deflected by the light deflection unit toward the angle range for irradiating the other eye of the observer and its vicinity is set as the second exit point. The multiple light deflection units arranged on the arrangement line are arranged so that a straight line passing through the first exit point and the center of one of the eyes and a straight line passing through the second exit point and the center of the other eye intersect with each other to form a intersection. The arrangement line is set as a plurality of arrangement lines, and at least one of the arrangement lines includes an area that is not parallel to the incident surface.

[0011] According to the structure, the intersection of the straight line passing through the first emission point and the center of one eye and the straight line passing through the second emission point and the center of the other eye is formed corresponding to each arrangement line. A plurality of arrangement lines include a region that is not parallel to the incident surface, thereby, in the case of displaying a stereoscopic image that is parallel to the incident surface, the interval between the arrangement lines used to display the stereoscopic image can be expanded, and the density of the light deflection unit can be reduced. Therefore, it is possible to realize a light guide plate having high transparency even in the case of displaying a stereoscopic image that is parallel to the incident surface.

[0012] Moreover, in the light guide plate of an embodiment of the present disclosure, the intersection point may be located on the inner side of the emission surface when viewed from the observer.

[0013] According to the above configuration, a three-dimensional image can be displayed on the back side of the light-emitting surface.

[0014] Moreover, in the light guide plate of an embodiment of the present disclosure, the plurality of arrangement lines may be straight lines, curves, a combination of two or more straight lines, a combination of two or more curves, or a combination of one or more straight lines and one or more curves.

[0015] According to the above configuration, the degree of freedom in moving the stereoscopic image is improved by switching the position of the light source that causes light to enter the light guide plate or moving the position at which the observer observes the stereoscopic image.

[0016] Moreover, in the light guide plate of an embodiment of the present disclosure, the plurality of arrangement lines may respectively include a plurality of line branch points or confluence points.

[0017] According to the above configuration, by switching the position of the light source that makes light enter the light guide plate or moving the position where the observer observes the stereoscopic image, it is possible to achieve expression in which the stereoscopic image is split or merged along the arrangement line.

[0018] Furthermore, in the light guide plate of an embodiment of the present disclosure, the plurality of arrangement lines may respectively include linear regions that are not parallel to each other.

[0019] According to the above configuration, by switching the position of the light source that makes light incident on the light guide plate or moving the position where the observer observes the stereoscopic image, it is possible to realize the expression of the stereoscopic image being enlarged or reduced along the arrangement line.

[0020] Moreover, in an embodiment of the present disclosure, the light guide plate may be such that the stereoscopic image includes: a first stereoscopic image, which is displayed by the light deflection unit in a partial area of ​​the light guide plate, namely, a first local area; and a second stereoscopic image, which is displayed by the light deflection unit in an area different from the first local area, namely, a second local area, and the light deflection unit is configured so that the first stereoscopic image and the second stereoscopic image can be observed from the same observation space.

[0021] According to the above configuration, the observer can observe the first stereoscopic image and the second stereoscopic image from the same observation space.

[0022] Moreover, in the light guide plate of one embodiment of the present disclosure, the stereoscopic image includes: a first stereoscopic image, which is displayed by the light deflection unit in a partial area of ​​the light guide plate, namely, a first local area; and a second stereoscopic image, which is displayed by the light deflection unit in an area different from the first local area, namely, a second local area, and the light deflection unit is configured so that the observation space capable of observing the first stereoscopic image and the observation space capable of observing the second stereoscopic image are arranged at different positions.

[0023] According to the above configuration, when an observer observes one of the first stereoscopic image and the second stereoscopic image, the reflection of the other image can be reduced.

[0024] Furthermore, in the light guide plate of an embodiment of the present disclosure, an angle formed between a region of each of the plurality of arrangement lines that is not parallel to the incident surface and the incident surface is greater than 2.5°.

[0025] According to the above configuration, the visibility of the stereoscopic image parallel to the incident plane is improved.

[0026] Moreover, a display device according to an embodiment of the present disclosure includes: the light guide plate described above; a plurality of light sources that allow light to enter the light guide plate from the incident surface; and a control unit that controls the plurality of light sources.

[0027] According to the above configuration, the control unit controls the plurality of light sources, thereby changing the positions of the light sources that cause light to enter the light guide plate.

[0028] Furthermore, in a display device according to an embodiment of the present disclosure, the plurality of light sources may be arranged in a line, and the control unit may control the plurality of light sources to light up and turn off in sequence from one end of the linear region toward the other end.

[0029] According to the above configuration, it is possible to realize control in which the position of the light source at which light enters the light guide plate is moved from one end toward the other end of the region where the plurality of light sources are arranged in a line.

[0030] Moreover, in a display device of one embodiment of the present disclosure, the multiple light sources may be arranged in a line, and the control unit controls the multiple light sources so that they are lit and extinguished in sequence from any point of the linear area that is not one end and the other end toward both ends.

[0031] According to the above configuration, it is possible to realize control in which the positions of the light sources from which light enters the light guide plate are moved from other than the two ends of the region where the plurality of light sources are arranged in a line toward the two ends.

[0032] Moreover, a gaming machine according to an embodiment of the present disclosure includes the display device.

[0033] According to the above structure, the same effect as that of the above display device can be achieved.

[0034] Moreover, an in-vehicle display according to an embodiment of the present disclosure includes the display device.

[0035] According to the above structure, the same effect as that of the above display device can be achieved.

[0036] [Effects of the Invention]

[0037] According to an embodiment of the present disclosure, a light guide plate or the like can be realized which can clearly display a stereoscopic image parallel to and close to an incident surface and has high transparency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a plan view showing the structure of a display device in one embodiment of the present disclosure.

[0039] Figure 2 It is a cross-sectional view showing the path of light guided by the light guide plate.

[0040] Figure 3 It is a perspective view for explaining the directivity of the outgoing light emitted from the outgoing surface of the light guide plate.

[0041] Figure 4The principle of stereoscopic display based on parallax is represented by a stereogram showing the intersection point of a straight line passing through a first emission point and the center of one eye of the observer and a straight line passing through a second emission point and the center of the other eye of the observer.

[0042] Figure 5 This is a perspective view showing a gaming machine including the display device according to the first embodiment.

[0043] Figure 6 FIG. 1 is a diagram showing an example in which a stereoscopic image having a portion parallel to and close to the incident surface is displayed on a display device as a comparative example.

[0044] Figure 7 This is a diagram showing an example of the relationship between the angle formed by the arrangement line and the incident plane and the display of a three-dimensional image in the display device according to the first embodiment.

[0045] Figure 8 It is a diagram showing a specific example of the arrangement of the light deflecting unit in the light guide plate.

[0046] Fig. 9 It is a diagram showing a more specific example of the arrangement of the light deflecting unit in the light guide plate.

[0047] Fig.10 This is a plan view showing an example of a display device according to Embodiment 2.

[0048] Fig.11 This is a plan view showing an example of a display device according to Embodiment 3.

[0049] Fig.12 This is a plan view showing another example of the display device according to Embodiment 3.

[0050] Fig.13 This is a plan view showing still another example of the display device according to the third embodiment.

[0051] Fig.14 This is a diagram showing a display device according to a first modified example of embodiment 3.

[0052] Fig.15 This is a diagram showing a display device according to a second modified example of embodiment 3.

[0053] Fig.16 This is a diagram showing a display device according to a third modified example of embodiment 3.

[0054] Fig.17 This is a diagram showing a display device according to a fourth modified example of embodiment 3.

[0055] Fig.18 This is a diagram showing a display device according to a fourth embodiment.

[0056] Fig.19 This is a diagram showing a display device according to a modified example of the fourth embodiment.

[0057] Fig. 20 is an embodiment of the fourth embodiment, and Fig.19 A diagram of a display device according to a modified example different from the modified example shown.

[0058] Fig.21 This is a diagram showing an example of arrangement lines according to the fifth embodiment.

[0059] Fig. 22 This is a diagram showing an example of a light guide plate according to Embodiment 5.

[0060] Fig.23 This is a diagram showing an example of arrangement lines according to the sixth embodiment.

[0061] Fig.24 This is a diagram showing an example of a light guide plate according to a sixth embodiment.

[0062] Fig.25 This is a diagram showing an example of arrangement lines according to the seventh embodiment.

[0063] Fig.26 This is a diagram showing an example of a light guide plate according to Embodiment 7.

[0064] Fig. 27 It is a diagram showing a specific example of control of a light source by a control unit.

[0065] [Explanation of Symbols]

[0066] 1A, 1B, 1C, 1CA, 1CB, 1CC, 1CD, 1DA, 1DB, 1DC, 1DD, 1DE, 1DF, 1DG, 1DH: Display device

[0067] 10A, 10B, 10C, 10CD, 10DB, 10DC, 10DE, 10DH, 10E, 10F, 10G: Light guide plate

[0068] 11a: Incident surface

[0069] 11c: Exit surface

[0070] 12, 121, 122, 123, 124, 125: Light deflection unit

[0071] 13, 17: Arrangement lines

[0072] 20, 21, 22, 23, 24, 25, 41, 42, 43, 44, 45, 46: light source

[0073] 30: Control Department

[0074] 100: Gaming consoles DETAILED DESCRIPTION

[0075] [Implementation method 1]

[0076] Hereinafter, one embodiment of the present disclosure will be described in detail. In the following description, "A to B" indicating a numerical range means "A or more and B or less" unless otherwise specified. In addition, in each of the drawings, sometimes only a part of the constituent elements that appear in plurality are denoted by reference numerals.

[0077] (Application example)

[0078] Figure 1 1A is a plan view showing the structure of a display device 1A in one embodiment of the present disclosure. Figure 1 To illustrate an example of a scenario in which the present disclosure is applicable. Figure 1 As shown, the display device 1A in the present disclosure includes a light guide plate 10A, a light source 20 and a control unit 30. Figure 1 Otherwise, the control unit 30 is omitted.

[0079] The light guide plate 10A displays a parallax-based stereoscopic image SI. In this application example, the light guide plate 10A has a rectangular plate shape when viewed from above. In other words, the light guide plate 10A has a rectangular parallelepiped shape. However, the shape of the light guide plate 10A is not limited thereto. The material of the light guide plate 10A may be, for example, polycarbonate, acrylic, other light-transmitting resins or glass.

[0080] The three-dimensional image SI includes one or more line segments or curves, etc. The three-dimensional image SI expresses text, graphics, or patterns, etc. through a combination of line segments or curves.

[0081] The light guide plate 10A has an incident surface 11a. The incident surface 11a is a surface on which light from the light source 20 is incident on the light guide plate 10A. The incident surface 11a is one of the side surfaces of the light guide plate 10A having a rectangular parallelepiped shape. The side surface refers to a surface adjacent to the main surface when the surface with the largest area in the rectangular parallelepiped shape is called the main surface.

[0082] The light guide plate 10A has another side surface 11b facing the incident surface 11a. In the display device 1A, the light source 20 may be disposed on the side surface 11b as well, so that light may be incident on the light guide plate 10A from the side surface 11b.

[0083] The light guide plate 10A has an emission surface 11c. The emission surface 11c is a surface from which light guided in the light guide plate 10A is emitted from the light guide plate 10A. The emission surface 11c is one main surface of the light guide plate 10A having a rectangular parallelepiped shape.

[0084] Moreover, the light guide plate 10A has a plurality of light deflecting portions 12. The light deflecting portions 12 deflect the light incident from the incident surface 11a and guided in the light guide plate 10A, thereby causing it to be emitted from the exit surface 11c. The light deflecting portions 12 in this embodiment are V-groove structures extending in a direction corresponding to the position of the observation space relative to the light guide plate 10A and the display position of the stereoscopic image SI, and are arranged in a plurality of rows along the incident direction. In the accompanying drawings, for the sake of convenience of explanation, the number of light deflecting portions 12 formed on the light guide plate 10A is reduced compared to the actual number.

[0085] Figure 2 1 is a cross-sectional view showing the path of light guided by the light guide plate 10A. Figure 2 As shown, the light deflecting unit 12 is provided on the back surface 11d of the light guide plate. The back surface 11d is the other main surface of the light guide plate 10A having a rectangular parallelepiped shape, which faces the emission surface 11c.

[0086] The light deflecting portion 12 has an inclined surface 12a as a reflecting surface for reflecting the light from the light source 20 incident from the incident surface 11a toward the exit surface 11c. In the present embodiment, in order to reflect the light L incident from the incident surface 11a, the light deflecting portion 12 has an inclined surface 12a corresponding to the incident surface 11a. In the case where light is also incident from the side surface 11b, the light guide plate 10A also includes a light deflecting portion 12 having an inclined surface 12a corresponding to the light from the side surface 11b. Moreover, the light deflecting portion 12 may also have a surface independent of the inclined surface 12a for reflecting the light incident to the light deflecting portion 12 from a direction other than the intended direction to a direction that cannot be seen by the observer.

[0087] In the light guide plate 10A, the light L incident from the incident surface 11a is guided while being totally reflected between the exit surface 11c and the back surface 11d. The light L incident on the light deflecting unit 12 is reflected by the inclined surface 12a, and is incident on the exit surface 11c at an incident angle smaller than the incident angle at which the light is totally reflected on the exit surface 11c. As a result, the light L is emitted from the exit surface 11c. However, the deflection of light by the light deflecting unit 12 is not limited to deflection by reflection, and may be deflection by refraction, for example.

[0088] The size of the light deflecting portion 12 in the direction perpendicular to the incident direction of the light from the light source 20 can be, for example, 30 μm to 300 μm. Moreover, the angle of the inclined surface 12a relative to the back surface 11d can be, for example, 30° to 60°. The shape of the light deflecting portion 12 when viewed from a top view from a direction perpendicular to the back surface 11d can be a quadrilateral such as a rectangle, or a spindle shape. In the latter case in particular, the formability of the light deflecting portion 12 is improved compared to the former shape. However, the size and shape of the light deflecting portion 12 are not limited to these.

[0089] Figure 3It is a perspective view for explaining the directivity of the outgoing light emitted from the outgoing surface 11 c of the light guide plate 10A. Figure 4 The principle of parallax-based stereoscopic display is represented by a stereogram showing the intersection of a straight line passing through a first emission point P1 and the center of one eye E1 of the observer and a straight line passing through a second emission point P2 and the center of the other eye E2 of the observer. Figure 3 and Figure 4 Only one light source 20 is shown.

[0090] Figure 3 The diagram shows a state where the observer observes the display device 1A from within an observation space of a predetermined range. The observation space is a space where at least a part of the stereoscopic image SI displayed by the display device 1A can be observed.

[0091] The light emitted within the angle range irradiated to one eye E1 of the observer and its vicinity is called the first emitted light L1, and the point on the emission surface 11c from which the first emitted light L1 is emitted is called the first emission point P1. Furthermore, the light emitted within the angle range irradiated to the other eye E2 of the same observer and its vicinity is called the second emitted light L2, and the point on the emission surface 11c from which the second emitted light L2 is emitted is called the second emission point P2.

[0092] The first emitted light L1 emitted from the first emission point P1 is seen by one eye E1 of the observer. On the other hand, the first emitted light L1 is not seen by the other eye E2, or the amount of light seen by the other eye E2 is very small compared to the amount of light seen by the one eye E1. As a result, the first emitted light L1 has directivity.

[0093] Moreover, the second emitted light L2 from the second emission point P2 is seen by the other eye E2 of the observer. On the other hand, the second emitted light L2 is not seen by one eye E1, or the amount of light seen by one eye E1 is very small compared to the amount of light seen by the other eye E2. As a result, the second emitted light L2 has directivity.

[0094] like Figure 4 As shown, a straight line passing through the first exit point P1 and the center of one eye E1, i.e., the pupil / lens, intersects with a straight line passing through the second exit point P2 and the center of the other eye E2 at the intersection C. In other words, the optical axis of the first exit light L1 seen by one eye E1 of the observer and the optical axis of the second exit light L2 seen by the other eye E2 of the observer intersect at the intersection C. Therefore, the observer will have an illusion that there is a luminous point at the intersection C.

[0095] When the intersection C is located on the observer side relative to the exit surface 11c, the observer sees the light point flying out of the exit surface 11c. On the other hand, when the intersection C is located on the opposite side of the exit surface 11c relative to the observer, the observer sees the light point located further back than the exit surface 11c. In this embodiment, the intersection C is located on the back side of the exit surface 11c as viewed from the observer. Therefore, the observer will perceive a sense of depth.

[0096] In this way, when the first emitted light L1 is emitted within an angle range toward one eye E1 of the observer and its vicinity, and the second emitted light L2 is emitted within an angle range toward the other eye E2 of the same observer and its vicinity, and the optical axis of the first emitted light L1 and the optical axis of the second emitted light L2 have an intersection C, the observer will have an illusion that a light-emitting point exists at the intersection C. Therefore, by forming such an intersection C as a set of points that are continuous in a manner of forming a plurality of intersections C1, C2, ..., the observer can perceive, for example, a three-dimensional stereoscopic image SI that is a straight line.

[0097] The light source 20 is a light emitting element that allows light to enter the light guide plate 10A. The light source 20 may be a point light source. An example of the light source 20 may be a light emitting diode (LED). However, the light source 20 is not limited thereto, and may be another light source such as a fluorescent lamp. Figure 1 In the embodiment, the display device 1A includes two light sources 20. However, the display device 1A may include three or more light sources 20. The plurality of light sources 20 may be arranged at intervals of 10 mm, for example, but the intervals of the light sources 20 are not limited thereto.

[0098] Moreover, as described above, the shape of the light guide plate 10A is not limited to the rectangular parallelepiped shape. For example, the light guide plate 10A may be in a shape in which a portion of the area when viewed from a direction perpendicular to the exit surface 11c is cut out in a rectangular shape, so that the incident surface 11a is not flush but has a step. In this case, the light sources 20 may be arranged along the non-flat incident surface 11a.

[0099] The control unit 30 controls the lighting and extinguishing of the light source 20. The specific contents of the control performed by the control unit 30 will be described later.

[0100] (Structure example)

[0101] Figure 5 1 is a perspective view showing a gaming machine 100 including a display device 1A according to the present embodiment. Figure 5As shown, a display device 1A is provided in a gaming machine 100 such as a ping-pong gaming machine or a ping-pong exchange machine. The display device 1A is arranged near the center of the gaming machine 100. The display device 1A displays images for various interpretations, such as an interpretation image representing a jackpot or an interpretation image representing the expectation of the jackpot. Specifically, as an image display, the display device 1A displays a stereoscopic image SI in three dimensions. The control unit 30 controls whether to display the stereoscopic image SI, the control of switching the light source 20 that is lit at a predetermined timing, or the control of switching a plurality of light sources 20 that emit light of different colors at a predetermined timing.

[0102] The game machine 100 is only one example of the application of the display device 1A of this embodiment, and does not limit the application range of the display device 1A. The display device 1A of this embodiment can be applied to any object having a function of displaying images. Another example of an object to which the display device 1A can be applied is a car display.

[0103] like Figure 1 As shown, in the display device 1A, the light deflecting unit 12 is arranged on the arrangement line 13. The arrangement line 13 is a linear arrangement area provided in plurality in the light guide plate 10A. Figure 1 In the embodiment, the arrangement lines 13 are a plurality of straight lines parallel to each other. However, the shape of the arrangement lines 13 is not limited thereto. Another example of the shape of the arrangement lines 13 will be described later.

[0104] Figure 6 1 is a diagram showing an example of a display device 1X as a comparative example displaying a stereoscopic image SI having a portion parallel to the incident surface 11a. The display device 1X has the same structure as the display device 1A except that the light guide plate 10A is replaced with the light guide plate 10X. The light guide plate 10X is different from the light guide plate 10A in that the arrangement line 13 is parallel to the incident surface 11a.

[0105] Figure 6 In the stereoscopic image SI, the stereoscopic image SI is an image of a broken line having two bending points. The direction of the line segment between the two bending points of the stereoscopic image SI becomes a direction parallel to the incident surface 11a. In the area of ​​the light guide plate 10X where such a line segment is displayed, the interval between the arrangement lines 13 must be narrowed. Therefore, the density of the light deflection portion 12 in the area becomes high, and the transparency of the light guide plate 10X may decrease. Moreover, as described later, in the display device 1X having the light guide plate 10X, it is sometimes difficult to display the line segment parallel to the incident surface 11a as a continuous line image.

[0106] In the light guide plate 10A, the arrangement lines 13 are not parallel to the incident surface 11a. Therefore, in the light guide plate 10A, even in a region where a three-dimensional image that is parallel to the incident surface 11a is displayed, the intervals between the arrangement lines 13 can be increased and the density of the light deflecting unit 12 can be reduced. Therefore, compared with the case where the arrangement lines 13 are parallel to the incident surface 11a, a light guide plate 10A having high transparency can be realized.

[0107] Furthermore, in the light guide plate 10A, the arrangement lines 13 are not parallel to the incident surface 11a, thereby improving the visibility of the portion of the three-dimensional image SI displayed by the light deflecting unit 12 arranged in the above region that is parallel to the incident surface 11a.

[0108] Figure 7 1A is a diagram showing an example of the relationship between the angle formed by the arrangement line 13 and the incident surface 11 a and the display of the stereoscopic image SI in the display device 1A. Figure 7 In the example of , an image of the character "A" is displayed as the three-dimensional image SI. Figure 7 In the figure, symbol 701 indicates a case where the angle formed between the arrangement line 13 and the incident surface 11a is 0°. Symbol 702 indicates a case where the angle formed between the arrangement line 13 and the incident surface 11a is 1°. Symbol 703 indicates a case where the angle formed between the arrangement line 13 and the incident surface 11a is 2°. Symbol 704 indicates a case where the angle formed between the arrangement line 13 and the incident surface 11a is 3°. Symbol 705 indicates a case where the angle formed between the arrangement line 13 and the incident surface 11a is 4°. Symbol 706 indicates a case where the angle formed between the arrangement line 13 and the incident surface 11a is 5°. Symbol 707 indicates a case where the angle formed between the arrangement line 13 and the incident surface 11a is 10°.

[0109] The image of the letter "A" includes two oblique line images and one horizontal line image. The horizontal line image is an image parallel to the incident surface 11a. As shown by symbol 701, when the angle between the arrangement line 13 and the incident surface 11a is 0°, the horizontal line image is almost invisible. As shown by symbol 702, when the angle between the arrangement line 13 and the incident surface 11a is 1°, the horizontal line image can be vaguely seen. After symbol 703, as the angle between the arrangement line 13 and the incident surface 11a increases, the visual recognizability of the horizontal line image increases.

[0110] In the light guide plate 10A, not all areas of all arrangement lines 13 may be areas that are not parallel to the incident plane 11a. In the display device 1A, it is sufficient that at least one arrangement line 13 includes an area that is not parallel to the incident plane 11a. In particular, it is sufficient that the area participating in the display of the portion parallel to or close to the incident plane 11a or parallel to the incident plane 11a of the stereoscopic image SI is an area that is not parallel to the incident plane 11a. By including the area of ​​the arrangement line 13 that is not parallel to the incident plane 11a as described above, the transparency of the light guide plate 10A and the visual recognizability of the portion parallel to the incident plane 11a in the stereoscopic image SI can be improved.

[0111] Figure 8 It is a diagram showing a specific example of the arrangement of the light deflecting unit 12 in the light guide plate 10A. Figure 8 In the figures, reference numerals 801 and 802 denote different specific examples. In any specific example, a matrix 14 is defined for a region where the light deflecting unit 12 is arranged, and the light deflecting unit 12 is arranged in the matrix 14 .

[0112] In the example shown by reference numeral 801 , the matrix 14 is arranged in a direction parallel to the incident surface 11 a and in a direction perpendicular to the incident surface 11 a . In this case, by arranging the light deflecting unit 12 only in the matrix 14 located on the arrangement line 13 , the light deflecting unit 12 can be arranged along the arrangement line 13 .

[0113] In the example shown by reference numeral 802 , the matrix 14 is arranged in a direction along the arrangement line 13 . In this case, by arranging the light deflecting unit 12 in any matrix 14 , the light deflecting unit 12 can be arranged along the arrangement line 13 .

[0114] Fig. 9 It is a diagram showing a more specific example of the arrangement of the light deflecting unit 12 in the light guide plate 10A. Fig. 9 In the figure, reference numeral 901 and reference numeral 902 represent different examples. Fig. 9 : shows an example of displaying an image of the character "A". Fig. 9 In FIG. 1 , the image of the character “A”, that is, the three-dimensional image SI is divided into two oblique line images SI1 and SI2 and one horizontal line image SI3 .

[0115] In the example shown by reference numeral 901, a light deflection unit 121 for displaying an image SI1 of an oblique line, a light deflection unit 122 for displaying an image SI2 of an oblique line, and a light deflection unit 123 for displaying an image SI3 of a horizontal line are shown as the light deflection units 12. The light deflection units 121 and 122 can be respectively arranged in different matrices 14 on the arrangement line 13. Furthermore, the light deflection unit 123 can be arranged in parallel with the arrangement line 13 in a further different matrix 14.

[0116] Furthermore, the light deflection unit 12 may also display two or more of the oblique line image SI1, the oblique line image SI2, and the horizontal line image SI3. In the example shown by reference numeral 902, as the light deflection unit 12, a light deflection unit 124 for displaying the oblique line image SI1, the oblique line image SI2, and the horizontal line image SI3 and a light deflection unit 125 for displaying the oblique line image SI1 and the oblique line image SI2 are shown. The light deflection unit 124 and the light deflection unit 125 may be respectively arranged in different matrices 14 on the arrangement line 13.

[0117] When a plurality of images are displayed by the light deflecting unit 12, the light deflecting unit 12 has portions corresponding to the plurality of images, respectively. In this case, the light deflecting unit 12 may be formed so that the portions that are convex with respect to the incident direction of light are more than the portions that are concave with respect to the incident direction of light. In this case, compared with the case where the portions that are concave with respect to the incident direction of light are more than the portions that are convex with respect to the incident direction of light, stray light caused by multiple reflections of light by the light deflecting unit 12 can be reduced.

[0118] In the display device 1A, the control unit 30 can switch the position of the light source 20 that makes light incident on the light guide plate 10A among the plurality of light sources 20. For example, the control unit 30 can turn on and off the plurality of light sources 20 in sequence. In this way, it is possible to perform an interpretation as if the three-dimensional image SI moves. At this time, the three-dimensional image SI moves in the direction along the arrangement line 13.

[0119] In the example shown by reference numeral 801, the pitch of the matrix 14 is equal in the direction parallel to the incident plane 11a and the direction perpendicular to the incident plane 11a. In this case, the angle between each of the arrangement lines 13 and the incident plane 11a can be 2.5° or more. Moreover, the angle between each of the arrangement lines 13 and the incident plane 11a can also be 5° or more. Thus, the visual recognition of the portion of the stereoscopic image SI parallel to the incident plane 11a is sufficiently improved.

[0120] Furthermore, the display device 1A may include a plurality of light guide plates 10A overlapped in such a manner that the main surfaces thereof are parallel to each other. In this case, in a region where the arrangement line 13 is parallel to the incident surface 11a, interference fringes may be generated by the light deflection unit 12 disposed along the arrangement line 13. When the display device 1A includes a plurality of light guide plates 10A, the generation of interference fringes can be reduced by making the slopes of the arrangement lines 13 in each of the light guide plates 10A different from each other.

[0121] Furthermore, the display device 1A can also be used in conjunction with a flat panel display such as a liquid crystal display device. In this case, a display system can be made that can simultaneously provide display of a flat panel display and display of a stereoscopic image by the display device 1A. In such a display system, by making the arrangement direction of the pixels of the flat panel display and the slope of the arrangement line 13 different from each other, the generation of interference fringes can be reduced.

[0122] Moreover, the spacing of the matrix 14 can be appropriately changed according to the purpose. For example, in order to make the three-dimensional image SI move smoothly in the direction parallel to the incident surface 11a, the spacing of the matrix 14 in the direction can be reduced to improve the resolution. In addition, in order to improve the visual recognition of the part of the three-dimensional image SI parallel to the incident surface 11a, the spacing of the matrix 14 in the direction perpendicular to the incident surface 11a can be reduced to improve the resolution.

[0123] Furthermore, the light source 20 may be a so-called RGB LED whose light color can be adjusted. In this case, the control unit 30 may control the light color emitted by the light source 20. The control unit 30 may realize effective interpretation by, for example, making the light colors of adjacent light sources 20 different from each other.

[0124] Furthermore, the control unit 30 can achieve a more powerful interpretation by color mixing by overlapping a plurality of stereoscopic images of different colors. For example, by overlapping a stereoscopic image of (R, G, B) = (255, 0, 0) with a stereoscopic image of (R, G, B) = (0, 255, 255), the overlapping portion can be set to (R, G, B) = (255, 255, 255), that is, white. Furthermore, the control unit 30 can also overlap three or more stereoscopic images.

[0125] In the light guide plate 10A, the number of light deflection units 12 arranged on the arrangement lines 13 varies depending on which position of the stereoscopic image SI the arrangement lines 13 correspond to. For example, in the case of displaying an image of the letter "A" as the stereoscopic image SI, light deflection units 12 for displaying an image of two oblique lines are arranged on the arrangement lines 13 corresponding to the upper and lower parts of the stereoscopic image SI. On the other hand, light deflection units 12 for displaying an image of two oblique lines and an image of a horizontal line are arranged on the arrangement lines 13 corresponding to the vicinity of the central part of the stereoscopic image SI. In this way, the number of light deflection units 12 arranged on the arrangement lines 13 varies depending on the shape of the stereoscopic image SI, and therefore the density of the light deflection units 12 varies depending on the position in the light guide plate 10A.

[0126] When the shape of the light deflecting unit 12 is fixed, the transparency of the light guide plate 10A may vary depending on the density of the light deflecting unit 12. In order to reduce the deviation, the shape of the light deflecting unit 12 may be appropriately changed. Alternatively, a dummy light deflecting unit 12 that is not related to the display of the stereoscopic image SI may be arranged in a region where the density of the light deflecting unit 12 is low.

[0127] [Implementation method 2]

[0128] Another embodiment of the present disclosure will be described below. In addition, for the sake of convenience, the same reference numerals are attached to components having the same functions as those described in the above embodiment, and their description will not be repeated.

[0129] Fig.10 1 is a plan view showing an example of a display device 1B according to Embodiment 2. The display device 1B is different from the display device 1A in that a light guide plate 10B is included instead of the light guide plate 10A. A light incident portion 15 is provided near the light source 20 on the incident surface 11a of the light guide plate 10B. The light incident portion 15 is a portion where the incident surface 11a is formed into a concave shape.

[0130] In the light guide plate 10A without the light input portion 15, the expansion of the light incident from the incident surface 11a is no more than about 40° relative to the optical axis, although it also depends on the material of the light guide plate 10A. Therefore, it is difficult to display a stereoscopic image SI with a large size in the direction perpendicular to the optical axis near the light source 20. For example, in the case where the stereoscopic image SI has a size of 20 mm in the direction perpendicular to the optical axis, the position where the light deflection portion 12 is arranged must be separated from the light source 20 by more than 10 mm in the direction along the optical axis. However, the actual position where the light deflection portion 12 is arranged is also affected by conditions such as the shape of the stereoscopic image SI.

[0131] In the display device 1B, light from the light source 20 enters the light guide plate 10B from the light input portion 15. Therefore, in the display device 1B, the spread of light incident from the light input portion 15 in a plane parallel to the main surface of the light guide plate 10B is greater than the spread of light incident from the flat incident surface 11a to the light guide plate 10A in the display device 1A. That is, in the light guide plate 10B, the area where light can reach near the incident surface 11a is wider than the area where light can reach near the incident surface 11a of the light guide plate 10A. Therefore, the degree of freedom in the design of the light guide plate 10B is improved.

[0132] The light incident portion 15 may be a slit, a lens array, a diffusion member, etc., arranged between the light source 20 and the incident surface 11a, other than the concave portion described above. Examples of the diffusion member include frosted glass and the like.

[0133] Moreover, as in other embodiments described later, in the display device 1B, light may also be incident on the light guide plate 10B from other side surfaces adjacent to the incident surface 11a. However, in this case, light from the other side surfaces is incident on the light deflection portion 12 located near the light incident portion 15 and having a large inclination relative to the incident surface 11a, thereby possibly generating unexpected light emission (crosstalk). Therefore, the shape and size of the light deflection portion 12 located near the light incident portion 15 may be appropriately adjusted to reduce crosstalk.

[0134] [Implementation method 3]

[0135] Fig.11 This is a plan view showing an example of a display device 1C according to a third embodiment. Fig.11 In the figure, reference numerals 1101, 1102, and 1103 represent different examples of the display device 1C. Fig.11 In the illustrated example, the display device 1C is different from the display device 1A in that a light guide plate 10C is included instead of the light guide plate 10A. The light guide plate 10C can display a plurality of stereoscopic images SIA, SIB by light incident from the light source 20 . Fig.11 In the figure, the stereoscopic image SIA is an image of the character "A", and the stereoscopic image SIB is an image of the character "B". Fig.11 In the embodiment, the display device 1C displays the stereoscopic image SIA and the stereoscopic image SIB using light from the same light source 20 .

[0136] The stereo image SIA and the stereo image SIB may be adjacent to each other in a direction along the incident direction of light, as indicated by symbol 1101. Furthermore, the stereo image SIA and the stereo image SIB may be adjacent to each other in a direction perpendicular to the incident direction of light, as indicated by symbol 1102. Furthermore, the stereo image SIA and the stereo image SIB may be adjacent to each other in a direction different from the incident direction of light and a direction perpendicular thereto, as indicated by symbol 1103.

[0137] Fig.12 It is a plan view showing another example of the display device 1C. Fig.12 In the figure, reference numerals 1201 and 1202 denote different examples of the display device 1C. Fig.12 In the example shown, the display device 1C includes a light source 21 that allows light to enter from the incident surface 11a and a light source 22 that allows light to enter from another side surface 11e adjacent to the incident surface 11a as the light source 20. In the display device 1C, the stereoscopic image SIA is displayed by the light from the light source 21, and the stereoscopic image SIB is displayed by the light from the light source 22.

[0138] The light deflection unit 12 for displaying the stereoscopic image SIA and the light deflection unit 12 for displaying the stereoscopic image SIB may be arranged in regions separated from each other as indicated by reference numeral 1201. Furthermore, the light deflection unit 12 for displaying the stereoscopic image SIA and the light deflection unit 12 for displaying the stereoscopic image SIB may be arranged in the same region as indicated by reference numeral 1202. In particular, in the example indicated by reference numeral 1202, by switching which of the light source 21 and the light source 22 is turned on, it is possible to switch which of the stereoscopic image SIA and the stereoscopic image SIB is displayed by the display device 1C.

[0139] Fig.13 It is a plan view showing still another example of the display device 1C. Fig.13In the illustrated example, the display device 1C displays a plurality of stereoscopic images SIA, SIB by light incident from the incident surface 11 a of the light guide plate 10C. Fig.13 In the example shown, the light source 20 for displaying the stereoscopic image SIA and the light source 20 for displaying the stereoscopic image SIB are independent of each other.

[0140] Fig.13 In the example shown, the display device 1C has a structure that narrows the spread of light incident on the light guide plate 10C. For example, a convex lens (not shown) may be arranged between the light source 20 and the light guide plate 10C. Alternatively, the light source 20 may also be a light source with strong directivity such as a bullet-shaped LED. Alternatively, the incident surface 11a may also have a shape that narrows the spread of the incident light. Thus, when the display device 1C displays only one of the stereoscopic image SIA and the stereoscopic image SIB, the situation where the other is accidentally displayed is reduced.

[0141] Moreover, in the display device 1C, the stereoscopic image SIA and the stereoscopic image SIB are displayed by the light deflection unit 12 in different local areas of the light guide plate 10C. In other words, the stereoscopic image displayed by the display device 1C includes: the stereoscopic image SIA (first stereoscopic image) displayed by the light deflection unit 12 in the first local area which is a part of the light guide plate 10C; and the stereoscopic image SIB (second stereoscopic image) displayed by the light deflection unit 12 in the second local area which is different from the first local area of ​​the light guide plate 10C.

[0142] In such a display device 1C, the light deflection unit 12 may be provided so that the stereoscopic image SIA and the stereoscopic image SIB can be observed from the same observation space. In this case, the observer can observe the first stereoscopic image SIA and the second stereoscopic image SIB from the same observation space.

[0143] In addition, by setting the observation space where the first stereo image SIA and the second stereo image SIB can be observed as a relatively narrow limited space, the display of the first stereo image SIA and the second stereo image SIB can be observed only from the limited space. On the other hand, by setting the observation space where the first stereo image SIA and the second stereo image SIB can be observed as a relatively wide-area space, the display of the first stereo image SIA and the second stereo image SIB can be observed from a wide range. The wide-area space may also include a position that is infinitely far away from the light guide plate 10C.

[0144] Furthermore, in the display device 1C, the light deflecting unit 12 may be provided so that the observation space where the stereoscopic image SIA can be observed and the observation space where the stereoscopic image SIB can be observed are arranged at different positions. In this case, when the observer observes one of the stereoscopic image SIA and the stereoscopic image SIB, the reflection of the other image can be reduced.

[0145] (Variant 1)

[0146] Fig.14 This is a diagram showing a display device 1CA according to a first modified example of the third embodiment. Fig.14 In the example shown, the distance between the light sources 20 is shorter than in other embodiments. The display device 1CA displays a plurality of stereoscopic images SIA1 and SIA2. The stereoscopic images SIA1 and SIA2 are images of the letter "A" that can be regarded as having the same shape.

[0147] In this state, by appropriately adjusting the brightness of each light source 20, it is possible to perform an interpretation as if one of the plurality of stereoscopic images SIA1 and SIA2 is a shadow of another one. This allows the observer to feel a sense of front and back.

[0148] (Variant 2)

[0149] Fig.15 This is a diagram showing a display device 1CB according to a second modification example of the third embodiment. Fig.15 In the example shown by symbols 1501, 1502, and 1503, the display device 1CB performs a so-called dissolve performance as if multiple stereoscopic images SIA and SIB are switched while moving. In other words, the control unit 30 switches the position of the light source 20 to move the display position of the stereoscopic image SIA and the stereoscopic image SIB. For simplicity, Fig.15 In the figure, the light source 20 in the unlit state is omitted. Fig.15 In the figure, symbol 1501 indicates the display when the movement of the display position starts, symbol 1502 indicates the display during the movement of the display position, and symbol 1503 indicates the display when the movement of the display position ends.

[0150] However, the display positions of the stereoscopic images SIA and SIB during the movement of the display position are not limited to the example shown by reference numeral 1502. The display device 1CB may display the stereoscopic images SIA and SIB at display positions other than those shown by reference numeral 1502 during the movement of the display position. Furthermore, the display device 1CB may not necessarily display the stereoscopic images SIA and SIB at the display positions shown by reference numeral 1502 during the movement of the display position.

[0151] As shown by symbol 1501, when the display position starts to move, only the stereoscopic image SIA is displayed. As shown by symbol 1502, during the movement of the display position, the stereoscopic image SIA and the stereoscopic image SIB are displayed overlapping each other. At this time, the size, tilt angle, density, etc. of the light deflection unit 12 are adjusted so that as the movement of the display position progresses, the image that is mainly seen changes from the stereoscopic image SIA to the stereoscopic image SIB. As shown by symbol 1503, when the movement of the display position is completed, only the stereoscopic image SIB is displayed. According to the display device 1CB, it is possible to perform an impactful interpretation such as the stereoscopic image SIA gradually changing to the stereoscopic image SIB while the display position of the stereoscopic image moves.

[0152] Moreover, in Fig.15 In the figure, reference numeral 1504 denotes an example different from reference numerals 1501 to 1503 of the display device 1CB according to the second modification example of the third embodiment. Fig.15 In the example shown by reference numeral 1504, the display device 1CB sequentially displays three stereoscopic images SIC, SID, and SIE at different positions. For simplicity, reference numeral 1504 shows the stereoscopic image SIC, the stereoscopic image SID, and the stereoscopic image SIE in a single figure.

[0153] Fig.15 In the example shown by the symbol 1504, the stereoscopic image SIC is an image of an elliptical figure. The stereoscopic image SIE is an image of a diamond figure. The stereoscopic image SID is an image of a figure intermediate between an ellipse and a diamond. In this example, the display device 1CB performs a so-called morphing interpretation such as the stereoscopic image SIC is moved while being transformed into the stereoscopic image SID and the stereoscopic image SIE in sequence.

[0154] (Variant 3)

[0155] Fig.16 This is a diagram showing a display device 1CC according to a third modified example of the third embodiment. Fig.16 In the example shown, the display device 1CC displays a stereoscopic image SIA and a planar image PI. Fig.16 In the figure, reference numerals 1601 and 1602 represent display devices 1CC in which the light sources 20 are turned on in different states. Fig.16 In the figure, the light source 20 in the unlit state is omitted.

[0156] like Fig.16 As shown in the symbols 1601 and 1602, the display position of the stereoscopic image SIA moves by switching the position of the light source 20. On the other hand, the planar image PI is displayed at a fixed position on the emission surface 11c or the back surface 11d regardless of the position of the light source 20 that is lit. Fig.16In the example of , the display content of the planar image PI is switched according to the position of the light source 20 that is turned on. However, the display content of the planar image PI may be always fixed regardless of the position of the light source 20 that is turned on.

[0157] In this way, in the display device 1CC, by combining the stereoscopic image SIA and the planar image PI, a more impactful interpretation can be performed. Moreover, by referring to the planar image PI displayed on the exit surface 11c or the back surface 11d, the observer can further emphasize the depth of the stereoscopic image SIA displayed on the inner side of the light guide plate 10C.

[0158] (Variant 4)

[0159] Fig.17 This is a diagram showing a display device 1CD according to a fourth modified example of the third embodiment. Fig.17 In the figure, reference numerals 1701 and 1702 represent display devices 1CD in which the light sources 20 are turned on in different states. Fig.17 In the figure, the light source 20 in the unlit state is omitted.

[0160] The display device 1CD includes a light guide plate 10CD and light sources 21, 22, 23, and 24 as light sources 20. The light guide plate 10CD displays a stereoscopic image SIA and a stereoscopic image SIB. The light sources 21, 22, 23, and 24 are arranged in sequence along an incident surface 11a of the light guide plate 10CD. The light sources 21 and 22 allow light for displaying the stereoscopic image SIA to be incident on the light guide plate 10CD. The light sources 23 and 24 allow light for displaying the stereoscopic image SIB to be incident on the light guide plate 10CD. For simplicity, Fig.17 In the figure, the light source 20 in the unlit state is omitted.

[0161] In the display device 1CD, the display position of the stereoscopic image SIA in the direction along the incident surface 11a is offset from the optical axes of the light sources 21 and 22 to the light sources 23 and 24. Moreover, in the display device 1CD, the display position of the stereoscopic image SIB is offset from the optical axes of the light sources 23 and 24 to the light sources 21 and 22. In particular, the display positions of the stereoscopic image SIA displayed by the light source 22 and the stereoscopic image SIB displayed by the light source 23 in the direction along the incident surface 11a can be regarded as substantially the same. Moreover, the display position of the stereoscopic image SIA in the direction perpendicular to the incident surface 11a is farther from the incident surface 11a than the display position of the stereoscopic image SIB in the said direction.

[0162] In the display device 1CD, the control unit 30 may first light up the light sources 21 and 24, and then light up the light sources 22 and 23. In this way, the stereoscopic images SIA and SIB can be displayed in a manner that they are gathered near the center of the light guide plate 10CD. In addition, by setting the lights emitted by the light sources 22 and 23 to different colors, the stereoscopic images SIA and SIB can be displayed in different colors.

[0163] [Implementation method 4]

[0164] Fig.18 It is a diagram showing a display device 1DA, a display device 1DB, and a display device 1DC according to a fourth embodiment. Fig.18 , reference numeral 1801 is a schematic perspective view showing a display device 1DA, reference numeral 1802 is a schematic perspective view showing a display device 1DB, and reference numeral 1803 is a schematic perspective view showing a display device 1DC.

[0165] The display device 1DA includes an auxiliary light guide 16A in addition to the structure of the display device 1A, as indicated by reference numeral 1801. The auxiliary light guide 16A may have the same structure as the light guide plate 10A except that it does not include the light deflecting unit 12.

[0166] Furthermore, the display device 1DA further includes a light source different from the light source 20, namely, a light source 41. The light emitted from the light source 41 is incident on the light guide plate 10A via the auxiliary light guide 16A, and is emitted from the exit surface 11c. The distance until the light from the light source 41 is emitted from the exit surface 11c is longer by the amount of the auxiliary light guide 16A than the distance until the light from the light source 20 is emitted from the exit surface 11c. Therefore, in the display device 1DA, an intersection CA1 with respect to the light from the light source 20 and an intersection CA2 with respect to the light from the light source 41 are generated. At the intersection CA1 and the intersection CA2, the amount relative to the depth of the light guide plate 10A, namely, the distance observed from the light guide plate 10A, is different from each other.

[0167] As shown in reference numeral 1802, the display device 1DB is different from the display device 1A in that it includes a light guide plate 10DB instead of the light guide plate 10A. The light guide plate 10DB is different from the light guide plate 10A in that it has a recess 16B. The recess 16B is a recess formed on the back surface 11d of the light guide plate 10DB.

[0168] Furthermore, the display device 1DB also includes a light source different from the light source 20, namely, a light source 42. The light source 20 is omitted in the symbol 1802. The light source 42 is accommodated in the recess 16B. The distance until the light from the light source 42 is emitted from the exit surface 11c is shorter than the distance until the light from the light source 20 is emitted from the exit surface 11c by the distance between the incident surface 11a and the recess 16B. Therefore, in the display device 1DB, an intersection CA1 (refer to the symbol 1801) regarding the light from the light source 20 and an intersection CA3 regarding the light from the light source 42 are generated. At the intersection CA1 and the intersection CA3, the amount of depth relative to the light guide plate 10DB is different from each other.

[0169] As shown by reference numeral 1803, the display device 1DC is different from the display device 1A in that it includes a light guide plate 10DC instead of the light guide plate 10A. The light guide plate 10DC is different from the light guide plate 10A in that a midway light entrance portion 16C is formed. The midway light entrance portion 16C is a portion provided on the side surface 11e of the light guide plate 10DC adjacent to the incident surface 11a, and allows light to enter the light guide plate 10DC.

[0170] Moreover, the display device 1DC also includes a light source different from the light source 20, namely, a light source 43. The light source 43 causes light to be incident on the light guide plate 10DC from the midway light entrance portion 16C. Furthermore, the light source 20 in the display device 1DC is arranged near the side surface 11e in such a manner that the optical axis of the light from the light source 20 passes through the light source 43. The distance until the light from the light source 43 is emitted from the exit surface 11c is shorter than the distance until the light from the light source 20 is emitted from the exit surface 11c by the distance between the incident surface 11a and the midway light entrance portion 16C. Therefore, in the display device 1DC, an intersection CA1 (refer to symbol 1801) regarding the light from the light source 20 and an intersection CA4 regarding the light from the light source 43 are generated. At the intersection CA1 and the intersection CA4, the depths relative to the light guide plate 10DC are different from each other.

[0171] As described above, in each of the display devices 1DA, 1DB, and 1DC, a plurality of intersections having different depths are generated corresponding to each arrangement line 13. Therefore, each of the display devices 1DA, 1DB, and 1DC can display a plurality of stereoscopic images having different depths as a whole.

[0172] (Variation Example)

[0173] Fig.19 The diagrams show a display device 1DD, a display device 1DE, and a display device 1DF according to a variation of the fourth embodiment. Fig.19, reference numeral 1901 is a schematic three-dimensional diagram showing a display device 1DD, reference numeral 1902 is a schematic three-dimensional diagram showing a display device 1DE, and reference numeral 1903 is a schematic three-dimensional diagram showing a display device 1DF.

[0174] As shown by reference numeral 1901, the display device 1DD includes, in addition to the configuration of the display device 1A, a light source 44 that allows light to enter the light guide plate 10A via the lens 16D and the lens 16D. Furthermore, although not shown in reference numeral 1901, the display device 1DD also includes a light source 20. In this display device 1DD, an intersection point CA1 (see reference numeral 1801) with respect to the light from the light source 20 and an intersection point CA5 with respect to the light from the light source 44 are generated.

[0175] The depths of the intersection CA1 and the intersection CA5 relative to the light guide plate 10DC are different from each other. Due to the characteristics of the lens 16D, the intersection CA5 may be located closer to the observer than the light guide plate 10A as shown by reference numeral 1901. This display device 1DD can also display a plurality of stereoscopic images with different depths.

[0176] As shown in reference numeral 1902, the display device 1DE is different from the display device 1A in that it includes a light guide plate 10DE instead of the light guide plate 10A. The light guide plate 10DE is different from the light guide plate 10A in that a recursive reflection structure 16E is formed on the side surface 11b facing the incident surface 11a.

[0177] The recursive reflection structure 16E reflects the light incident on the side surface 11b in a direction that can be regarded as substantially the same as the incident direction. However, the display device 1DE may not have the light guide plate 10DE, but may have a structure in which an independent recursive reflection member having the same function as the recursive reflection structure 16E is installed on the side surface 11b of the light guide plate 10A.

[0178] In the display device 1DE, the light reflected by the side surface 11b forms an intersection CA6 different from the intersection CA1. The intersection CA6 is located closer to the observer than the light guide plate 10DE as shown by reference numeral 1902 due to the shape of the light deflecting unit 12. With such a display device 1DE, a plurality of stereoscopic images having different depths can also be displayed.

[0179] As shown in reference numeral 1903, the display device 1DF includes a recursive reflector 16F in addition to the structure of the display device 1A. The recursive reflector 16F reflects incident light in a direction that can be regarded as substantially the same as the incident direction. The recursive reflector 16F is arranged on the side of the exit surface 11c of the light guide plate 10A. Considering visual recognition, in reference numeral 1903, the positional relationship between the exit surface 11c and the back surface 11d is reversed from that in other figures.

[0180] In this modified example, the observer observes the display device 1DF from the back side 11d. The light reflected by the recursive reflector 16F forms an intersection CA7 on the observer side relative to the light guide plate 10A. Therefore, according to the display device 1DF, a stereoscopic image can be displayed at a position closer to the observer side than the light guide plate 10A using the light guide plate 10A. That is, the observer can observe a stereoscopic image that flies out from the light guide plate 10A toward the front side.

[0181] Fig. 20 is an embodiment of the fourth embodiment, and Fig.19 The illustrated modifications are diagrams of a display device 1DG and a display device 1DH according to modifications different from those shown. Fig. 20 In the figure, reference numeral 2001 is a schematic perspective view showing the display device 1DG, and reference numeral 2002 is a schematic perspective view showing the display device 1DH.

[0182] As indicated by reference numeral 2001, the display device 1DG includes a light source 45 different from the light source 20 in addition to the configuration of the display device 1A. The light source 45 allows light to enter the light guide plate 10A from the side surface 11b facing the incident surface 11a. This display device 1DG also achieves the same effects as the display device 1A.

[0183] As shown by reference numeral 2002, the display device 1DH is different from the display device 1A in that a light guide plate 10DH is included instead of the light guide plate 10A. The light guide plate 10DH is different from the light guide plate 10A in that the position of the incident surface 11a other than the position where the light from the light source 20 is incident and the side surface 11b serve as a reflection surface for reflecting the light.

[0184] In the display device 1DH, among the light incident on the light guide plate 10DH from the light source 20, the light incident on the side surface 11b is reflected and further guided in the light guide plate 10DH. The light reflected by the side surface 11b acts as light from a virtual light source 46 located on the opposite side of the light source 20 with respect to the side surface 11b, and forms an intersection CA8 different from the intersection CA1. This display device 1DH also has the same effect as the display device 1A and the like.

[0185] [Implementation method 5]

[0186] Fig.21 1 is a diagram showing an example of the arrangement line 13 of the fifth embodiment. In the above embodiment, the arrangement lines 13 are all a plurality of straight lines parallel to each other, but the arrangement lines 13 are not limited thereto. The arrangement lines 13 may be a straight line, a curve, a combination of two or more straight lines, a combination of two or more curves, or a combination of one or more straight lines and one or more curves. Fig.21 This is indicated in symbols 2101, 2102, and 2103.

[0187] In the display device 1A, when the arrangement line 13 has such a shape, by switching the position of the light source 20 to be lit or moving the position where the observer observes the stereoscopic image SI, it is possible to express as if the stereoscopic image SI moves along the arrangement line 13. Therefore, the freedom of expression of the stereoscopic image SI is improved.

[0188] Fig. 22 1 is a diagram showing an example of a light guide plate 10E according to Embodiment 5. The light guide plate 10E is different from the light guide plate 10A in that it has arrangement lines 13 that are not linear. Fig. 22 In the figure, reference numerals 2201 and 2202 indicate different examples of the light guide plate 10E. Fig. 22 In FIG. 1 , a single figure shows a stereoscopic image SIA and a stereoscopic image SIB appearing at multiple positions during movement. Fig. 22 In FIG. 1 , the arrangement line 13 is illustrated as an arrow indicating the moving direction of the stereoscopic image SIA and the stereoscopic image SIB.

[0189] In the light guide plate 10E shown by reference numeral 2201, the arrangement line 13 of the light deflection unit 12 for displaying the stereoscopic image SIA has a shape formed by combining a curve that is convex in a direction away from the incident surface 11a and a curve that is convex in a direction close to the incident surface 11a. In the light guide plate 10E, the stereoscopic image SIA moves in a direction along the incident surface 11a while swinging in a direction perpendicular to the incident surface 11a as shown by reference numeral 2201. By reducing the amplitude and period of the swing in the direction perpendicular to the incident surface 11a, it is possible to perform an interpretation as if the stereoscopic image SIA is moving linearly in a simulated direction along the incident surface 11a.

[0190] In the light guide plate 10E shown by reference numeral 2202, the arrangement lines 13 of the light deflection units 12 for displaying the stereoscopic image SIA have a convex curve shape in the direction approaching the incident surface 11a. On the other hand, the arrangement lines 13 of the light deflection units 12 for displaying the stereoscopic image SIB have a convex curve shape in the direction away from the incident surface 11a. The arrangement lines 13 of the light deflection units 12 for displaying the stereoscopic image SIA and the arrangement lines 13 of the light deflection units 12 for displaying the stereoscopic image SIB intersect each other. In this light guide plate 10E, the stereoscopic image SIA and the stereoscopic image SIB temporarily exchange their positions in the direction perpendicular to the incident surface 11a while moving in the direction along the incident surface 11a, as shown by reference numeral 2202.

[0191] [Implementation method 6]

[0192] Fig.231 is a diagram showing an example of the arrangement line 13 of the sixth embodiment. In the above embodiment, the arrangement line 13 is a line having a single start point and a single end point, but the arrangement line 13 is not limited thereto. The arrangement line 13 may include a branch point or a confluence point of a plurality of lines. A specific example of such an arrangement line 13 is Fig.23 This is indicated in symbols 2301, 2302, and 2303.

[0193] In the display device 1A, etc., when the arrangement line 13 has such a shape, by switching the position of the light source 20 to be lit or moving the position where the observer observes the stereoscopic image SI, it is possible to express as if the stereoscopic image SI is split or merged along the arrangement line 13. Therefore, the degree of freedom of expression of the stereoscopic image SI is improved.

[0194] Fig.24 1 is a diagram showing an example of a light guide plate 10F according to Embodiment 6. The light guide plate 10F is different from the light guide plate 10A in that the arrangement lines 13 include a plurality of branch points or confluence points of the lines. Fig.24 In the figure, reference numerals 2401 and 2402 indicate different examples of the light guide plate 10F. Fig.24 In FIG. 1 , a stereoscopic image SIA appearing at multiple positions during movement is shown in a single figure. Fig.24 In FIG. 1 , the arrangement line 13 is illustrated as an arrow indicating the moving direction of the stereoscopic image SIA.

[0195] Fig.24 In the light guide plate 10F shown by reference numeral 2401, the arrangement line 13 has a shape branching from one end to two directions. At this time, the stereoscopic image SIA is a single image at the start point of movement, but is split into two and moves.

[0196] and, Fig.24 In the light guide plate 10F shown by reference numeral 2402, the arrangement line 13 has a shape that branches from one end to four directions. In this case, the stereoscopic image SIA is a single image at the start point of movement, but is split into four and moves.

[0197] Fig.24 The examples shown are all examples where the stereoscopic image SIA is split into multiple images. However, as described above, according to the arrangement line 13 of the sixth embodiment, multiple stereoscopic images can also be merged. For example, Fig.24 In the example shown, two or four stereoscopic images SIA can be merged by setting one end opposite to the other end.

[0198] [Implementation method 7]

[0199] Fig.25 This is a diagram showing an example of the arrangement line 13 according to the seventh embodiment. Fig.25In the figure, reference numerals 2501 and 2502 represent different examples of the arrangement lines 13 of the seventh embodiment.

[0200] For example, Fig.25 As shown in the symbol 2501 of FIG. 1 , the arrangement line 13 may include linear regions that are not parallel to each other. In the display device 1A, etc., when the arrangement line 13 has such a shape, by switching the position of the light source 20 that is lit or moving the position where the observer observes the stereoscopic image SI, it is possible to express as if the stereoscopic image SI is enlarged or reduced along the arrangement line 13. Therefore, the degree of freedom of expression of the stereoscopic image SI is improved.

[0201] Furthermore, since the arrangement lines 13 are not parallel to each other, in the case where there is a region where the intervals between the arrangement lines 13 become too wide, for example, Fig.25 As shown in the reference numeral 2502, an auxiliary arrangement line 17 may be added to the region. In this case, it is possible to suppress a decrease in the image quality of the stereoscopic image SI while maintaining the degree of freedom of expression of the stereoscopic image SI.

[0202] Fig.26 1 is a diagram showing an example of a light guide plate 10G according to Embodiment 7. The light guide plate 10G is different from the light guide plate 10A in that the arrangement lines 13 are not parallel to each other. Fig.26 In FIG. 1 , a stereoscopic image SIA appearing at multiple positions during movement is shown in a single figure. Fig.26 In FIG. 1 , the arrangement line 13 is illustrated as an arrow indicating the moving direction of the stereoscopic image SIA.

[0203] Fig.26 In the light guide plate 10G shown in FIG. 1 , the intervals between the plurality of arrangement lines 13 are increased as the three-dimensional image SIA moves from the starting point to the end point. At this time, the three-dimensional image SIA is enlarged as it moves along the arrangement lines 13. Fig.26 In contrast to the example of FIG. 1 , the intervals between the plurality of arrangement lines 13 are narrowed as the stereoscopic image SIA moves from the starting point toward the end point. At this time, the stereoscopic image SIA is reduced as it moves along the arrangement lines 13 .

[0204] [Implementation method 8]

[0205] Fig. 27 1 is a diagram showing a specific example of control of the light source 20 by the control unit 30 . Fig. 27 In the figure, reference numerals 2701 and 2702 represent different examples of the control of the light source 20 by the control unit 30 . Fig. 27 In FIG. 1 , a stereoscopic image SIA appearing at multiple positions during movement is shown in a single figure. Fig. 27 In FIG. 1 , the arrangement line 13 is illustrated as an arrow indicating the moving direction of the stereoscopic image SIA.

[0206] Fig. 27 In the example shown, the control unit 30 controls the lighting and extinguishing of five light sources 21, 22, 23, 24, and 25 as the light source 20. The light sources 21, 22, 23, 24, and 25 are arranged in sequence in a line.

[0207] The control unit 30 can control the light sources 21, 22, 23, 24, and 25 so that they are turned on and off in sequence from one end of the linear region to the other end. Fig. 27 As shown in the symbol 2701 of FIG. 1 , only the light source 21 is initially turned on. Next, the control unit 30 turns off the light source 21 and turns on the light source 22. Then, the control unit 30 sequentially turns off the light source 22 and turns on the light source 23, turns off the light source 23 and turns on the light source 24, and turns off the light source 24 and turns on the light source 25. By such control, the following control can be achieved, that is, the position of the light source 20 where light is incident on the light guide plate 10A is moved from one end toward the other end of the area where the light sources 20 are arranged linearly.

[0208] Furthermore, the control unit 30 can control the light sources 21 , 22 , 23 , 24 , and 25 so as to be turned on and off in sequence from any point other than one end and the other end of the linear region toward both ends.

[0209] The control unit 30 is, for example, Fig. 27 As shown in the symbol 2702, only the light source 23 is initially turned on. Next, the control unit 30 turns off the light source 23 and turns on the light sources 22 and 24. Furthermore, the control unit 30 turns off the light sources 22 and 24 and turns on the light sources 21 and 25. By such control, the following control can be achieved, that is, the position of the light source 20 where light is incident on the light guide plate 10A is moved from outside the two ends of the area where the light sources 20 are arranged linearly to the two ends.

[0210] The number of light sources 20 controlled by the control unit 30 is not limited to the above. Moreover, the control unit 30 can make the light sources 20 emit light one by one or make a plurality of light sources 20 emit light. Furthermore, the control unit 30 can also gradually increase or decrease the number of light sources 20 that emit light simultaneously.

[0211] The present disclosure is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. Embodiments obtained by appropriately combining technical components disclosed in different embodiments are also included in the technical scope of the present disclosure.

[0212] 〔Summarize〕

[0213] The present disclosure can also be expressed as follows.

[0214] The light guide plate of embodiment 1 of the present disclosure displays a parallax-based stereoscopic image, and the light guide plate includes: an incident surface, on which light from a light source is incident; an exit surface, on which the light is exited; and a plurality of light deflecting portions, which deflect the light incident from the incident surface and guided by the light, thereby causing it to exit from the exit surface, wherein the plurality of light deflecting portions are arranged on an arrangement line as a linear arrangement area, and if the exit surface is directed to emit the first exit light deflected by the light deflecting portion within an angle range irradiated to one eye of an observer observing the exit surface from a specified range of observation space and its vicinity, A point on the light beam is set as a first exit point, and a point on the exit surface of the second exit light deflected by the light deflection unit is set as a second exit point, and the plurality of light deflection units arranged on the arrangement line are arranged so that a straight line passing through the first exit point and the center of one of the eyes and a straight line passing through the second exit point and the center of the other eye intersect with each other to form a crossing point, and the arrangement line is set as a plurality of arrangement lines, and at least one of the arrangement lines includes a region that is not parallel to the incident surface.

[0215] The light guide plate according to Embodiment 2 of the present disclosure is that in Embodiment 1, the intersection is located on the back side of the emission surface as viewed from the observer.

[0216] The light guide plate of embodiment 3 of the present disclosure is in embodiment 1 or embodiment 2, wherein the plurality of arrangement lines are straight lines, curves, a combination of two or more straight lines, a combination of two or more curves, or a combination of one or more straight lines and one or more curves.

[0217] The light guide plate of Embodiment 4 of the present disclosure is any one of Embodiments 1 to 3, wherein the plurality of arrangement lines respectively include a plurality of line branch points or confluence points.

[0218] The light guide plate according to Embodiment 5 of the present disclosure is any one of Embodiments 1 to 4, wherein the plurality of arrangement lines each include linear regions that are not parallel to each other.

[0219] The light guide plate of embodiment 6 of the present disclosure is in any one of embodiments 1 to 5, wherein the stereoscopic image includes: a first stereoscopic image, displayed by the light deflection portion in a first local area which is a part of the light guide plate; and a second stereoscopic image, displayed by the light deflection portion in a second local area which is different from the first local area, wherein the light deflection portion is configured so that the first stereoscopic image and the second stereoscopic image can be observed from the same observation space.

[0220] The light guide plate of embodiment 7 of the present disclosure is in any one of embodiments 1 to 5, wherein the stereoscopic image includes: a first stereoscopic image, displayed by the light deflection unit in a first local area which is a partial area of ​​the light guide plate; and a second stereoscopic image, displayed by the light deflection unit in a second local area which is different from the first local area, wherein the light deflection unit is configured so that the observation space capable of observing the first stereoscopic image and the observation space capable of observing the second stereoscopic image are arranged at different positions.

[0221] The light guide plate of Embodiment 8 of the present disclosure is any one of Embodiments 1 to 7, wherein an angle formed between a region of each of the plurality of arrangement lines that is not parallel to the incident plane and the incident plane is greater than 2.5°.

[0222] A display device according to Embodiment 9 of the present disclosure includes: the light guide plate according to any one of Embodiments 1 to 8; a plurality of light sources that allow light to enter the light guide plate from the incident surface; and a control unit that controls the plurality of light sources.

[0223] The display device of Embodiment 10 of the present disclosure is that in Embodiment 9, the plurality of light sources are arranged in a line, and the control unit controls the plurality of light sources so as to light up and turn off sequentially from one end toward the other end of the linear region.

[0224] The display device of embodiment 11 of the present disclosure is in embodiment 9, wherein the plurality of light sources are arranged in a line, and the control unit controls the plurality of light sources so as to light up and turn off in sequence from any point other than one end and the other end of the linear area toward both ends.

[0225] A gaming machine according to a twelfth embodiment of the present disclosure includes the display device according to any one of the ninth to eleventh embodiments.

[0226] The in-vehicle display according to Embodiment 13 of the present disclosure includes the display device according to any one of Embodiments 9 to 11.

Claims

1. A light guide plate for displaying a parallax-based stereoscopic image, the light guide plate comprising: An incident surface, through which light from a light source is incident; An exit surface for emitting the light; as well as A plurality of light deflecting units deflect the light incident from the incident surface and guided so as to emit the light from the emission surface, The plurality of light deflecting units are arranged on an arrangement line which is a linear arrangement area. If a point on the exit surface that emits the first exit light deflected by the light deflection unit within an angle range irradiated toward one eye of an observer observing the exit surface from a specified range of observation space and its vicinity is set as a first exit point, and a point on the exit surface that emits the second exit light deflected by the light deflection unit within an angle range irradiated toward the other eye of the observer and its vicinity is set as a second exit point, then the plurality of light deflection units arranged on the arrangement line are arranged so that a straight line passing through the first exit point and the center of the one eye and a straight line passing through the second exit point and the center of the other eye intersect each other to form a cross point, The arrangement lines are provided as a plurality of arrangement lines, and at least one of the arrangement lines includes a region which is not parallel to the incident surface.

2. The light guide plate according to claim 1, wherein The intersection point is located on the inner side of the emission surface as viewed from the observer.

3. The light guide plate according to claim 1, wherein The plurality of arrangement lines are respectively a straight line, a curve, a combination of two or more straight lines, a combination of two or more curves, or a combination of one or more straight lines and one or more curves.

4. The light guide plate according to claim 1, wherein The plurality of arrangement lines respectively include a plurality of line branch points or confluence points.

5. The light guide plate according to claim 1, wherein The plurality of arrangement lines respectively include linear regions that are not parallel to each other. The light guide plate according to claim 1 , wherein The stereoscopic image includes: a first stereoscopic image displayed by the light deflecting unit in a first partial area, which is a part of the light guide plate; and a second stereoscopic image displayed by the light deflecting unit in a second partial area, which is a region different from the first partial area. The light deflecting unit is provided so that the first stereoscopic image and the second stereoscopic image can be observed from the same observation space.

7. The light guide plate according to claim 1, wherein The stereoscopic image includes: a first stereoscopic image displayed by the light deflecting unit in a first partial area, which is a part of the light guide plate; and a second stereoscopic image displayed by the light deflecting unit in a second partial area, which is a region different from the first partial area. The light deflecting unit is provided so that the observation space in which the first stereoscopic image can be observed and the observation space in which the second stereoscopic image can be observed are arranged at different positions from each other.

8. The light guide plate according to claim 1, wherein An angle formed between a region of each of the plurality of arrangement lines that is not parallel to the incident plane and the incident plane is greater than or equal to 2.5°.

9. A display device, comprising: The light guide plate according to claim 1; A plurality of light sources, causing light to be incident from the incident surface to the light guide plate; as well as The control unit controls the plurality of light sources.

10. The display device according to claim 9, wherein The multiple light sources are arranged in a line. The control unit controls the plurality of light sources so as to be turned on and off sequentially from one end of the line toward the other end.

11. The display device according to claim 9, wherein The multiple light sources are arranged in a line. The control unit controls the plurality of light sources so as to be turned on and off sequentially from an arbitrary point other than the one end and the other end of the line toward both ends of the one end and the other end.

12. A gaming machine comprising the display device according to any one of claims 9 to 11.

13. An in-vehicle display, comprising the display device according to any one of claims 9 to 11.

Images