Display device and head-up display device

Abstract

To provide a display device that can be miniaturized. [Solution] The display device 100 includes a first display means 110 that outputs display light, an aerial image forming element 120 that has a flat plate shape and is positioned on the flat plate surface to receive the display light, a first polarized light transmission reflective film 130 installed on the flat plate surface of the aerial image forming element 120 that reflects the display light output from the first display 110, a folding mirror 140 that reflects the light reflected by the first polarized light transmission reflective film 130 back to the first polarized light transmission reflective film 130, and a polarizing member 150 that polarizes the reflected light into light that passes through the first polarized light transmission reflective film. The aerial image forming element 120 generates an aerial image Q that can be seen by the observer M by forming an image of the light that has been polarized by the polarizing member 150 and passed through the first polarized light transmission reflective film 130.

Description

Technical Field

[0001] The present disclosure relates to a display device and a head-up display device.

Background Art

[0002] Conventionally, a display device has been proposed that forms a real image in space to allow an observer to visually recognize an image floating in the air (a virtual image in the air) (see, for example, Patent Document 1). In this display device, display light output from a display (a device that outputs light indicating a "base object") is transmitted through a two-sided reflector array (a virtual image forming element) to form a virtual image on the line of sight of the observer and allow the observer to visually recognize it.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In this display device, the size of the virtual image in the air visually recognized by the observer is equal to the size of the base object, that is, the size of the object displayed on the display (display area), and the distance at which the virtual image appears to float with respect to the two-sided reflector array (floating distance) is equal to the distance from the two-sided reflector array to the display.

[0005] For this reason, in order to allow the observer to visually recognize a larger virtual image in the air or increase the floating distance of the virtual image in the air, it was necessary to increase the display area of the display or increase the distance from the two-sided reflector array to the display. When this was done, it was necessary to secure a large space on the back side of the two-sided reflector array (the side not visible to the observer), resulting in a problem that the display device became larger.

[0006] This disclosure was made in consideration of these circumstances, and aims to provide a display device and a head-up display device that can be miniaturized. [Means for solving the problem]

[0007] The display device of this disclosure includes a first display means that outputs display light indicating a first base object; an aerial image forming element having a flat plate shape and positioned on the flat plate surface to receive the display light; a first polarized light transmission reflective film installed on the flat plate surface of the aerial image forming element and reflecting the display light output from the first display means; a folding mirror that reflects the display light reflected by the first polarized light transmission reflective film back to the first polarized light transmission reflective film; and a polarizing member that polarizes the light reflected back by the folding mirror into light that passes through the first polarized light transmission reflective film. The aerial image forming element generates an aerial image visible to an observer by forming an image of the light that has been polarized by the polarizing member and passed through the first polarized light transmission reflective film. [Effects of the Invention]

[0008] The display device and head-up display device of this disclosure make it possible to miniaturize the display device and the head-up display device. [Brief explanation of the drawing]

[0009] [Figure 1] This is an explanatory diagram showing the schematic structure of the display device shown in Embodiment 1. [Figure 2] This is an explanatory diagram showing the schematic structure of the display device shown in Embodiment 2. [Figure 3] This is an explanatory diagram showing the schematic structure of the display device shown in Embodiment 3. [Figure 4] This is an explanatory diagram showing another schematic structure of the display device shown in Embodiment 3. [Figure 5] This is an explanatory diagram showing the schematic structure of the display device shown in Embodiment 4. [Figure 6] This is an explanatory diagram showing the schematic structure of the display device shown in Embodiment 5. [Figure 7] This is an explanatory diagram showing the schematic structure of the display device shown in Embodiment 6. [Figure 8] This is an explanatory diagram showing the schematic structure of the display device shown in Embodiment 7. [Modes for carrying out the invention]

[0010] An example of the display device of this disclosure will be given and described in detail with reference to the drawings. The display device of this disclosure can be mainly mounted on vehicles such as automobiles, agricultural machinery, and construction machinery. In the embodiment shown, the display device will be described using the case where the display device is installed on the instrument panel of a vehicle as an example. Furthermore, the display device of this disclosure can also be used as a display device for a head-up display (H-Up Display) device mounted on a vehicle or the like.

[0011] [Embodiment 1] Figure 1 is an explanatory diagram showing the schematic configuration of a display device corresponding to Embodiment 1. The display device 100 is installed on the instrument panel 200 of a vehicle and includes a first display (first display means) 110, a two-sided reflector array 120, a first polarizing light transmission reflective film (hereinafter referred to as "first PBS (Polarizing Beam Splitter)") 130, a folding mirror 140, a first 1 / 4λ plate (phase difference plate, polarizing member) 150, and a housing 160 that houses these components. For the sake of explanation, the drawings are marked with "F," "R," "T," and "B" to indicate "front," "rear," "up," and "down," and the front, rear, up, and down directions of the display device 100 will be described according to these markings.

[0012] An opening 162 facing observer M is formed on the front side of the housing 160 (the side facing the vehicle interior, the side facing observer M). A light-transmitting (transparent) cover 164 is installed over the opening 162 to prevent dust and other debris from entering the interior.

[0013] The two-sided reflector array 120 is a general aerial imaging element, and for example, a two-sided orthogonal reflector array or a two-sided corner reflector array can be used. The two-sided reflector array 120 has a flat plate shape and is installed inside the housing 160 at a 45-degree tilt when viewed from the side, as shown in Figure 1. The two-sided reflector array 120 is in the line of sight of observer M via the cover 164 and is positioned between the first display unit 110 and observer M. Therefore, as will be described later, the light transmitted through the two-sided reflector array 120 (transmitted light) is imaged in the line of sight of observer M and is visible to observer M as an aerial image Q.

[0014] The first PBS130 is an optical component that selectively transmits and reflects linearly polarized light according to its polarization direction. The first PBS130 is installed on the rear surface (the surface opposite to the observer M, the back) of the two-sided reflector array 120 facing the first display unit 110. For example, the first PBS130 may be directly bonded to the rear surface of the two-sided reflector array 120, or the first PBS130 may be bonded to a transparent flat plate and this flat plate may be installed (held) in contact with the rear surface of the two-sided reflector array 120. Furthermore, when the first PBS130 is installed on the rear surface of the two-sided reflector array 120 (including when it is installed via a transparent flat plate), the entire surface of the first PBS130 may be bonded to the rear surface of the two-sided reflector array 120, or only the peripheral part may be bonded.

[0015] The first display unit 110 is located in the line of sight of observer M and behind the two-sided reflector array 120. The first display unit 110 is a TFT display that displays an image of the object (first base object) that forms the basis of the image perceived as the aerial image Q. Linearly polarized light with S polarization is output as display light from the display surface of the first display unit 110.

[0016] The first PBS 130 is installed on the two-sided reflector array 120 in a direction that reflects the linearly polarized light received from the first display 110. The first PBS 130 is installed together with the two-sided reflector array 120 in a state inclined at 45 degrees in side view. For this reason, the display light output from the first display 110 toward the first PBS 130 is reflected by the first PBS 130 in a substantially vertically downward direction.

[0017] The folding mirror 140 is disposed at a position directly below the first PBS 130 and the two-sided reflector array 120 on the same side of the two-sided reflector array 120 as the first display 110. The folding mirror 140 has a substantially horizontal mirror surface and reflects the light incident from directly above in a direction folded back upward.

[0018] The first quarter-wave plate 150 is installed on the upper surface of the folding mirror 140 facing the two-sided reflector array 120 in a state where the slow axis is inclined at approximately 45 degrees with respect to the polarization axis of the incident linearly polarized light. The first quarter-wave plate 150 may be adhered to the entire upper surface of the folding mirror 140 or only adhered to the peripheral portion.

[0019] The light reflected in a substantially vertically downward direction by the first PBS 130 passes through the first quarter-wave plate 150 and is reflected by the folding mirror 140 in a substantially vertically upward direction. The light reflected by the folding mirror 140 passes through the first quarter-wave plate 150, whereby the polarization axis is rotated by 90 degrees. By rotating the polarization axis of the reflected light by 90 degrees in this way, the reflected light becomes linearly polarized light that passes through the first PBS 130.

[0020] The light reflected by the folding mirror 140 in a substantially vertically upward direction passes through the first PBS 130 and passes through the two-sided reflector array 120. The light that has passed through the two-sided reflector array 120 forms an image on the line of sight of the observer M and is visually recognized by the observer M as the aerial image Q.

[0021] Since the display device 100 is equipped with a first PBS 130, a first 1 / 4λ plate 150, and a folding mirror 140, the path distance of the light is substantially longer compared to a configuration in which the display light output from the first display unit 110 is simply viewed by the observer M as an aerial image Q via the two-sided reflector array 120. Therefore, even without increasing the distance between the first display unit 110 and the two-sided reflector array 120, the display position of the aerial image Q can be brought closer to the observer M, making it possible to view a larger, more projected aerial image Q.

[0022] More specifically, by providing the first PBS 130, the first 1 / 4λ plate 150, and the folding mirror 140, an aerial image Q can be displayed at the same size as when the first display unit 110 is placed at the position of the virtual image S shown in Figure 1. If distance A is the distance from the first display unit 110 to the two-sided reflector array 120 (first PBS 130), and distance B is the distance from the two-sided reflector array 120 (first PBS 130) to the folding mirror 140, then the distance from the virtual image S to the two-sided reflector array 120 (first PBS 130) is (distance A + distance B) + distance B, which is clearly longer than the distance B from the two-sided reflector array 120 to the folding mirror 140. In other words, with the configuration of the display device 100, it is possible to reduce the space below the two-sided reflector array 120 compared to when the first display unit 110 is placed at the position of the virtual image S, and the volume of the display device 100 (size of the housing 160) can be reduced.

[0023] Furthermore, consider the case where, for example, the first PBS130, the first 1 / 4λ plate150, and the folded mirror140 are not used, and an upright microlens array is used instead of the two-sided reflector array120. In order to make the size of the aerial image Q visible to observer M the same as the position of the aerial image Q visible to the display device 100 shown in Figure 1, the distance from the microlens array to the first display unit 110 must be longer than the distance A from the first display unit 110 to the two-sided reflector array120 shown in Figure 1. However, with the configuration of the display device 100 shown in Figure 1, the space behind the two-sided reflector array120 can be reduced compared to the case where a microlens array is installed, and the volume of the display device 100 (size of the housing 160) can be reduced.

[0024] Furthermore, since the first 1 / 4λ plate 150 is folded and glued to the mirror 140 to form a single unit, the overall number of parts can be reduced.

[0025] [Embodiment 2] Figure 2 is an explanatory diagram showing the schematic configuration of a display device corresponding to Embodiment 2. In Embodiment 2, components identical to those described in Embodiment 1 are denoted by the same reference numerals, and detailed descriptions of those components are omitted. Furthermore, for the sake of clarity, the instrument panel 200 and the housing 160 are omitted from the drawings from Figure 2 onward.

[0026] The display device 101 shown in Figure 2 differs from the display device 100 shown in Figure 1 in that the first 1 / 4λ plate 150, which was installed on the folding mirror 140, is removed, a second 1 / 4λ plate (phase difference plate) 151 is installed on the entire front surface of the display surface of the first display unit 110, and a third 1 / 4λ plate (phase difference plate, polarizing member) 152 is installed on the entire rear surface of the first PBS 130.

[0027] The linearly polarized display light output from the display surface of the first display unit 110 becomes right-circularly polarized after passing through the second 1 / 4λ plate 151 and is output to the third 1 / 4λ plate 152 and the first PBS 130. The right-circularly polarized light incident on the third 1 / 4λ plate 152 becomes linearly polarized by the third 1 / 4λ plate 152 before being incident on the first PBS 130 (first incidence of the first PBS). However, as explained in Embodiment 1, the linearly polarized light is reflected by the first PBS 130, passes through the third 1 / 4λ plate 152 again, becomes right-circularly polarized again, and is output in a substantially vertical downward direction.

[0028] Light with right circular polarization, output in a nearly vertical downward direction, is reflected by the folding mirror 140 to become light with left circular polarization and is again incident on the third quarter-λ plate 152. When the light with left circular polarization incident on the third quarter-λ plate 152 passes through the third quarter-λ plate 152, the polarization axis of the light is rotated by 90° with respect to the polarization axis at the time of the first incidence of the first PBS, and it is transmitted through the first PBS 130. The light that has been transmitted through the first PBS 130 is imaged by the two-sided reflector array 120 to generate an aerial image Q.

[0029] In the display device 101 corresponding to Embodiment 2, similar to the display device 100 described in Embodiment 1, the space behind or below the two-sided reflector array 120 can be made smaller than in the conventional configuration, and the volume of the display device 101 (size of the housing 160) can be made even smaller.

[0030] Furthermore, by laminating the third 1 / 4λ plate 152 to the rear surface (the entire rear surface, outer surface) of the first PBS 130 and integrating them, the overall number of parts can be reduced. In particular, since the two-sided reflector array 120 has a flat plate shape, the process of laminating the third 1 / 4λ plate 152 to the two-sided reflector array 120 and the first PBS 130 is easier than laminating the third 1 / 4λ plate 152 to a folded mirror that does not have a flat plate shape (for example, the folded mirror 141 in Figure 3, which will be described later).

[0031] [Embodiment 3] Figures 3 and 4 are explanatory diagrams showing the schematic configuration of a display device corresponding to Embodiment 3. In Embodiment 3, the same reference numerals are used for components that are the same as those described in Embodiments 1 and 2, and a detailed description of those components is omitted.

[0032] The folded mirror 141 of the display device 102 shown in Figure 3 differs from the folded mirror 140 of the display device 101 shown in Figure 2 in that its upper surface is a concave mirror surface.

[0033] In the display device 102 shown in Figure 3, even if the distance from the two-sided reflector array 120 and the third 1 / 4λ plate 152 to the folding mirror 141 is the same as the distance from the two-sided reflector array 120 and the third 1 / 4λ plate 152 to the folding mirror 140 as shown in the display device 101 of Embodiment 2 (Figure 2), the display image of the display unit 110 (the display image of the first base object) reflected by the concave mirror surface is magnified because the upper surface of the folding mirror 141 is a concave mirror surface. Therefore, the position of the virtual image S2 of the display device 102 is located further from the two-sided reflector array 120 (at a longer distance and lower) compared to the position of the virtual image S (corresponding to S1 in Figure 3) of the display device 101 shown in Embodiment 2 (Figure 2).

[0034] As described above, the position of the virtual image S2 on the display device 102 is farther away than the position of the virtual image S on the display device 101. Therefore, in the display device 102 in Figure 3, the amount of projection of the aerial image Q2 visible to observer M is greater than the amount of projection of the aerial image Q (corresponding to Q1 in Figure 3) visible to observer M on the display device 101. Here, the amount of projection refers to the distance from the two-sided reflector array 120 to the aerial image. In the display device 102, the aerial image Q2 is closer to observer M than the aerial image Q1, allowing observer M to see a larger aerial image Q2.

[0035] Therefore, for example, even if the vertical dimensions of the first display unit 111 and the second 1 / 4λ plate 154 are made shorter than the vertical dimensions of the first display unit 110 and the second 1 / 4λ plate 151 of the display unit 101, as in the display unit 103 shown in Figure 4, or if the first display unit 111 and the second 1 / 4λ plate 154 are placed closer to the two-sided reflector array 120, the viewing position (projection amount) of the aerial image Q in the display unit 103 can be made the same as the viewing position (projection amount) of the aerial image Q shown in Figure 2, because the upper surface of the folded mirror 141 is a concave mirror surface. Consequently, when an aerial image Q of the same size as the aerial image Q explained in Figure 2 is made visible to the observer M, the display unit 103 can be made smaller than the display unit 101, and the volume of the display unit 103 (size of the housing 160) can be made smaller.

[0036] [Embodiment 4] Figure 5 is an explanatory diagram showing the schematic configuration of a display device corresponding to Embodiment 4. In Embodiment 4, the same reference numerals are used for components that are the same as those described in Embodiments 1 to 3, and a detailed description of those components is omitted.

[0037] In the display device 104 shown in Figure 5, the installation angle and position of the first display unit 111 and the second 1 / 4λ plate 154, as well as the installation angle and position of the folding mirror 141, are different from those of the first display unit 111, the second 1 / 4λ plate 154, and the folding mirror 141 of the display device 103 shown in Figure 4.

[0038] As shown in Figure 5, the incident angle θ1 is the angle at which the light output from the display surface of the first display unit 111 enters the two-sided reflector array 120, and the incident angle θ2 is the angle at which the light reflected by the folding mirror 141 enters the two-sided reflector array 120. In this case, in the display device 104 corresponding to Embodiment 4, the installation angles and positions of the first display unit 111 and the second 1 / 4λ plate 154, and the installation angle and position of the folding mirror 141 are adjusted so that their respective incident angles (θ1 and θ2) do not coincide.

[0039] In the display device 104, the incident angle θ2 of the central path of the light ray that is reflected by the folding mirror 141 and goes to the two-sided reflector array 120 is smaller than the incident angle θ1 of the central path of the light ray that goes from the first display unit 111 to the two-sided reflector array 120 (θ1 > θ2).

[0040] In this way, by adjusting the installation angle and position of the first display unit 111 and the second 1 / 4λ plate 154, and the installation angle and position of the folding mirror 141, even if some of the light output from the first display unit 111 passes directly through the two-sided reflector array 120 and stray light is generated, it is possible to prevent the stray light from being seen by the observer M.

[0041] Furthermore, as shown in Figure 5, even when adjusting the installation angle and position of the first display unit 111, the second 1 / 4λ plate 154, and the folding mirror 141, the volume of the display device 104 (size of the housing 160) can be reduced compared to conventional designs by making the upper surface of the folding mirror 141 a concave mirror surface, as described in Embodiment 3.

[0042] [Embodiment 5] Figure 6 is an explanatory diagram showing the schematic configuration of a display device corresponding to Embodiment 5. In Embodiment 5, the same reference numerals are used for components that are the same as those described in Embodiments 1 to 4, and a detailed description of those components is omitted.

[0043] The display device 105 shown in Figure 6 differs from the display device 103 shown in Figure 4 in that it is provided with a second PBS (second Polarizing Beam Splitter, second polarizing transmission and reflection film) 170 and a second display unit (second display means) 180. The second PBS 170 is provided on the entire front surface of the two-sided reflector array 120. Here, the entire front surface of the two-sided reflector array 120 is the surface opposite to the flat surface on which the first PBS 130 is installed. The second PBS 170, like the first PBS 130, is an optical element that selectively transmits and reflects linearly polarized light, and its polarization axis is in the same direction as that of the first PBS 130.

[0044] The second display unit 180 has a display surface for displaying a second base object and is positioned directly above the two-sided reflector array 120 with its optical axis pointed directly downwards. Therefore, the second display unit 180 is located on the opposite side of the first display unit 111 via the two-sided reflector array 120. The second display unit 180 outputs linearly polarized light in the direction reflected by the second PBS 170.

[0045] When the second display unit 180 outputs a display light indicating a second base object, this display light is reflected by the second PBS 170, generating a second virtual image T in the observer M's line of sight. Therefore, when the aerial image Q output from the first display unit 111 is formed, the observer M sees the second virtual image T output from the second display unit 180 together with the aerial image Q, and at least a portion of the two overlap.

[0046] Thus, the display device 105 makes it possible for observer M to simultaneously view multiple images (the second virtual image T and the aerial image Q) at different display distances on approximately the same line. Furthermore, observer M can focus on only one of the displays without moving their gaze. In this case, since the two images have different focal points, one display is less likely to interfere with viewing the other.

[0047] Furthermore, since the display device 105 also uses the same basic configuration as the display device 103 shown in Figure 4, the volume of the display device 105 (the size of the housing 160) can be made smaller than in conventional devices.

[0048] [Embodiment 6] Figure 7 is an explanatory diagram showing the schematic configuration of a display device corresponding to Embodiment 6. In Embodiment 6, the same reference numerals are used for components that are the same as those described in Embodiments 1 to 5, and a detailed description of those components is omitted.

[0049] The display device 106 shown in Figure 7 differs from the display device 105 shown in Figure 6 in that it is located between the two-sided reflector array 120 and the observer M, and a convex lens 190 is provided in the observer M's line of sight. In addition, with the installation of the convex lens 190, a first correction lens 191 is installed over the entire front side (two-sided reflector array 120 side) of the second 1 / 4λ plate 154, and a second correction lens 192 is installed over the entire lower side (two-sided reflector array 120 side) of the second display unit 180. The first correction lens 191 and the second correction lens 192 are installed to correct chromatic aberration.

[0050] By placing the convex lens 190 in the line of sight of observer M, the second virtual image T generated by the display light of the second display unit 180 ("second base object") and the second PBS 170 is magnified. Therefore, the second virtual image T is perceived by observer M as appearing larger and further away. At this time, the light generating the aerial image Q also passes through the convex lens 190, so the amount of projection of the aerial image Q is reduced (see aerial image Q3 in Figure 7).

[0051] By providing the convex lens 190 in this way, the position of the second virtual image T and the aerial image Q visible to the observer M can be adjusted and changed without changing the positions of the first display unit 111, the second display unit 180, or the two-sided reflector array 120. Therefore, in order to adjust and change the position of the second virtual image T and the aerial image Q visible to the observer, it is not necessary to increase or decrease the distance of the first display unit 111 or the second display unit 180 relative to the two-sided reflector array 120, and the volume of the display device 106 (size of the housing 160) can be easily reduced.

[0052] Furthermore, since the light that generates the aerial image Q passes through the convex lens 190, causing distortion in the aerial image Q, it is desirable that the concave surface of the folded mirror 141 be a free-form surface with a shape that can correct the distortion of the aerial image Q caused by the convex lens 190.

[0053] Furthermore, by using the concave mirror-folding mirror 141, the aerial image Q of the "first base object" displayed on the first display unit 111 can be greatly enlarged. However, if the aerial image Q is to be enlarged even further, the folding mirror 141 must be made larger, which may lead to an increase in the volume of the display device 106 (the size of the housing 160). In the display device 106, since a convex lens 190 is provided, there is no need to enlarge the concave mirror-folding mirror 141, and it is easy to reduce the volume of the display device 106 (the size of the housing 160).

[0054] [Embodiment 7] Figure 8 is an explanatory diagram showing the schematic configuration of a display device corresponding to Embodiment 7. In Embodiment 7, the same reference numerals are used for components that are the same as those described in Embodiments 1 to 6, and a detailed description of those components is omitted.

[0055] The display device 107 shown in Figure 8 differs from the display device 106 shown in Figure 7 in that it is equipped with a camera 300 capable of capturing both the aerial image Q and the movement of observer M's hand H. By capturing the entire aerial image Q and the movement of observer M's hand H as it attempts to touch the aerial image Q with the camera 300, information (video, images, etc.) can be obtained to analyze the operations performed by observer M on the aerial image Q.

[0056] For example, if the content displayed as the aerial image Q is a button image for controlling operations such as video playback / pause, fast forward / rewind, and volume adjustment, or a thumbnail image for switching between multiple contents, observer M will use their hand H to touch the operation buttons or select the thumbnail image. These operations are captured by camera 300, and known image analysis techniques are used to analyze the movements of observer M as they attempt to operate the aerial image Q with their hand H. This analysis makes it possible to control and operate video playback / pause, fast forward / rewind, and volume adjustment operations in accordance with the movements of observer M's hand H in the air. Note that camera 300 does not necessarily need to be able to directly capture the aerial image Q itself; it is sufficient if it can somehow grasp the positional relationship between the content displayed on the aerial image Q as seen from camera 300 and observer M's hand H.

[0057] Furthermore, if both the second virtual image T and the aerial image Q are visible to observer M, observer M can operate the aerial image Q, which is displayed near observer M, while viewing the second virtual image T, which is displayed far away and out of reach of hand H. In this case as well, by capturing and analyzing the movements of the aerial image Q and observer M's hand H with camera 300, observer M can operate the second virtual image T without impairing its visibility.

[0058] Although several embodiments of the display device and head-up display device of this disclosure have been described above, these embodiments are presented as examples only, and the display device and head-up display device of this disclosure are not limited to those shown in the embodiments.

[0059] For example, in the display devices 100 to 107 described in Embodiments 1 to 7, it is also possible to add and bond an absorbing polarizing plate that transmits linearly polarized light in the same direction as the polarization transmission axis of the first PBS 130 to the entire surface of the observer M side (front side) of the two-sided reflector array 120. In this way, by bonding an absorbing polarizing plate to the two-sided reflector array 120, even if the light output from the first display units 110 and 111 is not completely reflected by the first PBS 130 but is transmitted directly through the two-sided reflector array 120 and becomes stray light, the absorbing polarizing plate can absorb the stray light. Therefore, it is possible to prevent the stray light from being seen by the observer M.

[0060] Furthermore, the first display units 110, 111 and the second display unit 180 are not limited to TFT displays, but may also be segment-type liquid crystal displays or displays that combine lighting means with translucent members on which a specific design is printed or molded.

[0061] Furthermore, the display light output by the first displays 110, 111 and the second display 180 is not limited to linearly polarized light with S polarization, but may also be circularly polarized light or the like. In this case, by suitably installing polarizing plates and 1 / 4λ plates according to the polarization characteristics of the light output from the first displays 110, 111 and the second display 180, it is possible to achieve the same effects as the display devices 100 to 107 described in Embodiments 1 to 7. [Explanation of Symbols]

[0062] 100~107…Display device 110,111...First display (first display means) 120...Two-sided reflector array (aerial image forming element) 130...1st PBS (1st polarized light transmission reflection film) 140,141…Folding mirror 150 ...First 1 / 4λ plate (polarizing member) 151,154 …Second 1 / 4λ plate 152 ... Third 1 / 4λ plate (polarizing member) 160 ... cabinet 162 … (Opening of the casing) 164 …(Case) cover 170...2nd PBS (2nd polarized light transmission reflection film) 180...Second display (second display means) 190 ... convex lens 191 ...First corrective lens 192 ...Second corrective lens 200... Instrument panel 300... Camera H... (Observer's) hand M... Observer Q,Q1,Q2,Q3…Aerial image S...Illusion T... The second illusion

Claims

1. A first display means that outputs a display light indicating a first base object, An aerial image forming element having a flat plate shape and positioned on the flat plate surface to receive the display light, A first polarized light transmission reflective film is installed on the flat surface of the aerial image forming element and reflects the display light output from the first display means, A folding mirror that reflects the display light reflected by the first polarized light-transmitting reflective film back to the first polarized light-transmitting reflective film, A polarizing member that polarizes the light reflected by the aforementioned folding mirror into light that passes through the first polarizing transmission reflective film, It has, The aerial image forming element generates an aerial image visible to an observer by forming an image of light that has been polarized by the polarizing member and transmitted through the first polarized transmission and reflection film. A display device characterized by the following.

2. The polarizing member is provided on the mirror surface of the folded mirror. The display device according to claim 1, characterized by the following:

3. The polarizing member is provided on the outer surface of the first polarizing transmission and reflection film. The display device according to claim 1, characterized by the following:

4. The aforementioned folding mirror has a concave mirror surface. The display device according to claim 1, characterized by the following:

5. It has a second display means that outputs a display light indicating a second base object, On the flat surface of the aerial image forming element, opposite to the flat surface on which the first polarized light-transmitting reflective film is installed, a second polarized light-transmitting reflective film is installed that reflects the display light output from the second display means to allow the observer to see a virtual image, and also transmits the light formed by the aerial image forming element to allow the observer to see the aerial image. The display device according to claim 1, characterized by the following:

6. A convex lens for magnifying the aerial image is positioned between the aerial image forming element and the observer. The display device according to claim 1, characterized by the following:

7. The camera has the ability to capture the aerial image and the movements of the observer's hands, thereby acquiring information for analyzing the observer's actions on the aerial image. The display device according to claim 1, characterized by the following:

8. A head-up display device comprising the display device according to any one of claims 1 to 7.

Images