Indication device

Abstract

The purpose of the present invention is to provide a display device that enables preferable imaging of a viewer.　A display device of the present invention comprises: a display unit (11) that emits display light relating to an image so as to be projected onto a projection member (3), and causes a viewer (4) located at the rear side relative to the projection member (3) to visually recognize the resulting reflective light as a virtual image (V) at the front side relative to the projection member (3); an illumination unit that emits position detection light so as to be projected onto the projection member (3) and illuminates the face of the viewer (4) with the resulting reflective light; an imaging unit (15) that captures imaging light, which is the position detection light sequentially reflected from the viewer (4) and the projection member (3); and a housing (17) for housing therein the display unit (11), the illumination unit, and the imaging unit (15). The display unit (11), the illumination unit, and the imaging unit (15) are housed in the housing (17) such that the optical path of the display light and the optical path of the position detection light and the imaging light do not overlap each other, and the projection position of the position detection light and the imaging light on the projection member (3) is located closer to the eyes of the viewer (4) than the projection position of the display light on the projection member (3).

Description

【Technical Field】 【0001】 The present disclosure relates to a display device for vehicles and the like. 【Background Art】 【0002】 A head-up display is mounted on a vehicle or the like, projects various information onto a projection member such as a windshield, and allows a viewer to visually recognize the virtual image. In order to improve visibility, such a head-up display uses a technique of photographing the viewer's face, detecting the position of the eyes from the obtained result, and adjusting the display position of the image based on this. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2008-126984 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 As a method for photographing the viewer's face, a method is known in which infrared light is irradiated onto a projection member and reflected, and then the infrared light reflected by the viewer's face and returned to the head-up display is imaged. However, in a limited housing, an infrared irradiation device, an imaging device, and a structure for arranging them must be provided so as not to conflict with the optical path of the display light related to the image to be visually recognized by the viewer, and the degree of freedom in design is small. In addition, depending on the arrangement, a sufficient viewing angle may not be obtained for photographing the viewer's face, and there is a risk that the calculation of the eye position becomes insufficient. 【0005】 The present disclosure has been made in consideration of such circumstances, and an object thereof is to provide a display device capable of suitably performing photographing. 【Means for Solving the Problems】 【0006】 To solve the above-mentioned problems, the display device of this disclosure comprises: a display unit that emits display light relating to an image and projects it onto a projection member, causing the reflected light to be visible as a virtual image in front of the projection member to a viewer positioned behind the projection member; an illumination unit that emits position detection light and projects it onto the projection member, illuminating the viewer's face with the reflected light; an imaging unit that captures the imaging light, which is the position detection light, sequentially reflected by the viewer and the projection member; and a housing that houses the display unit, the illumination unit, and the imaging unit, wherein the optical paths of the display light, the position detection light, and the imaging light do not overlap, and the projection positions of the position detection light and the imaging light on the projection member are closer to the viewer's eyes than the projection position of the display light on the projection member, with the display unit, the illumination unit, and the imaging unit arranged within the housing. [Effects of the Invention] 【0007】 The display device disclosed herein allows for suitable photography. [Brief explanation of the drawing] 【0008】 [Figure 1] An explanatory diagram showing an example of the configuration of the HUD in this embodiment, mounted on a vehicle. [Figure 2] External perspective view of the HUD. [Figure 3] An explanatory diagram showing the HUD in Figure 1 from above. [Figure 4] An explanatory diagram showing an example configuration of a HUD as the first modified example mounted on a vehicle. [Figure 5] External perspective view of the HUD. [Figure 6] A perspective view of the HUD as a second modified example. [Figure 7] An explanatory diagram showing the HUD in Figure 6 from above. [Figure 8] A cross-sectional view along the line VIII-VIII in Figure 7. [Figure 9] A perspective view of the HUD as a third modified example. [Figure 10] An explanatory diagram showing the HUD in Figure 9 from above. [Figure 11]A cross-sectional view along the line XI-XI in Figure 10. [Figure 12] A perspective view of the HUD as a fourth modified example. [Figure 13] An explanatory diagram showing the HUD in Figure 12 from above. [Figure 14] A cross-sectional view along the line XIV-XIV in Figure 13. [Modes for carrying out the invention] 【0009】 Embodiments of the display device of this disclosure will be described with reference to the attached drawings. The display device of this disclosure can be applied to display devices mounted on vehicles such as automobiles and motorcycles, as well as on ships, agricultural machinery, and construction machinery. In this embodiment, an example will be described in which the display device is mounted on a vehicle and displays required information based on various information acquired from the vehicle, etc. 【0010】 Figure 1 is an explanatory diagram showing an example of the configuration of the HUD 10 in this embodiment, which is mounted on vehicle 1. Figure 2 is an external perspective view of the HUD10. Figure 3 is an explanatory diagram showing the HUD10 from Figure 1 from above. 【0011】 In the following explanation, "front," "back," "up," "down," "right," and "left" follow the definitions "Fr.", "Re.", "To.", "Bo.", "R," and "L" in Figures 1 through 14. 【0012】 The HUD 10 is mounted in the instrument panel 5 of the vehicle 1. The HUD 10 includes a display unit 11, a flat mirror 12, a concave mirror 13, a lighting unit 14, an imaging unit 15, a control board 16, and a housing 17. The HUD 10 reflects the display light related to the image displayed by the display unit 11 with the flat mirror 12 and the concave mirror 13 which are relay optical systems, and projects (irradiates) it onto the windshield 3 (projection member) on the vehicle 1. The driver 4 (viewer) of the vehicle 1 located behind the windshield 3 visually recognizes the reflected light of this display light as a virtual image V in front of the windshield 3. As a result, the image is displayed in a virtual area that overlaps the actual scene visually recognized by the driver 4 through the windshield 3 (in front of the windshield 3). 【0013】 The display unit 11 displays an image and emits the display light related to the image toward the flat mirror 12. The display unit 11 is, for example, a TFT (Thin Film Transistor) type liquid crystal display unit or an organic EL (Electroluminescence) display unit. Note that the display unit 11 may have a projector and a screen constituting a display surface. 【0014】 The flat mirror 12 reflects the display light emitted by the display unit 11 toward the concave mirror 13. The concave mirror 13 further reflects the display light reflected by the flat mirror 12 and emits it from the housing 17 as display light having an optical axis L1 toward the windshield 3. The concave mirror 13 has a function as a magnifying lens, magnifies the image displayed on the display unit 11, and reflects it toward the windshield 3 side. That is, the virtual image V visually recognized by the driver 4 is an enlarged image of the image displayed on the display unit 11. 【0015】 The lighting unit 14 is an infrared light source (infrared ray) having an optical axis L2, which emits infrared light and projects it onto the windshield 3, and illuminates mainly the face of the viewer with the reflected light. This infrared light is position detection light for calculating the eye position from the image of the face of the driver 4. The infrared light is, for example, near infrared rays (NIR, for example, wavelength 780 to 1000 nm) or short wavelength infrared rays (SWIR, for example, 1000 to 2000 nm). 【0016】 The imaging unit 15 is a CMOS (Complementary Metal-Oxide Semiconductor) camera with an optical axis L3 that senses infrared light and captures images. Specifically, the imaging unit 15 senses the imaging light, which is position detection light sequentially reflected by the driver 4 and the windshield 3, and captures images mainly of the face of the driver 4. 【0017】 The control board 16 controls the display unit 11 based on information acquired from various parts of the vehicle 1. The control board 16 includes a microprocessor, microcontroller, graphics controller, integrated circuit, etc., and performs predetermined processing necessary for the HUD 10. Specifically, the control board 16 performs the drawing process of the image to be displayed on the display unit 11, generates the image, and controls the display of the generated image on the display unit 11. The control board 16 also calculates the eye position of the driver 4 from the image obtained from the imaging unit 15. Based on the obtained eye position information, the control board 16 adjusts the display position of the image, determines the state of the driver 4, and provides necessary warnings. 【0018】 The housing 17 is formed of, for example, black resin, painted or surface-treated black metal, and supports and houses the display unit 11, the plane mirror 12, the concave mirror 13, the control board 16, the illumination unit 14, and the imaging unit 15 inside. Specifically, the housing 17 has a front housing section 20 and a rear housing section 30. 【0019】 The front housing section 20 is a space for housing the display unit 11, the plane mirror 12, the concave mirror 13, and the control board 16, and supports the display unit 11, the plane mirror 12, and the concave mirror 13 so that the display light emitted from the housing 17 obtains the required optical axis L1. 【0020】 The rear housing section 30 is a space for housing the illumination unit 14 and the imaging unit 15, and is positioned rearward (towards the driver 4) than the front housing section 20 when mounted in a vehicle. The rear housing section 30 supports the illumination unit 14 and the imaging unit 15, for example, by arranging them along the left-right direction, so that the infrared light emitted from the illumination unit 14 can obtain the required optical axis L2 and the imaging light from the imaging unit 15 can obtain the required optical axis L3. 【0021】 As shown in Figure 3, the optical axes L1, L2, and L3 are set so that the optical path 21 of the display light having optical axis L1 and the optical paths 31 of the infrared light and imaging light having optical axes L2 and L3 do not overlap, and the projection position of the infrared light and imaging light on the windshield 3 is closer to the driver's eyes (face) than the projection position of the display light on the windshield 3. The housing 17 is configured to achieve these conditions by arranging the display unit 11, the plane mirror 12, the concave mirror 13, the illumination unit 14, and the imaging unit 15. 【0022】 Specifically, as shown in Figure 1, the cross-section of the windshield 3, which serves as the projection member, has a gently convex arc shape that extends outward from the vehicle 1, and is tilted so that the front is lower and the rear is higher. Therefore, the housing 17 is configured such that the position where infrared light is emitted from the housing 17 and the position where imaging light is incident on the housing 17 are behind the position where display light is emitted from the housing 17. This results in the projection position of infrared light and imaging light on the windshield 3 being higher and further back than the projection position of display light, and closer to the driver's face. 【0023】 The front housing section 20 has a front opening 23 (display light opening) covered by a front protective cover 22. The outer edge of the front opening 23 emits display light, forming a display light optical path 21. The front protective cover 22 is made of a transparent resin (e.g., polycarbonate) and prevents dust and other particles from entering. The front protective cover 22 is also designed so that when external light such as sunlight is incident on it, the reflected light does not go towards the windshield 3 but towards the instrument panel 5 side of the vehicle 1. Specifically, the front protective cover 22 (front opening 23) has a concave shape that is higher at the rear (driver 4 side) and lower towards the front (windshield 3 side). 【0024】 The rear housing section 30 has a rear opening 33 (detection light opening) covered by a rear protective cover 32. The outer edge of the rear opening 33, the area exposed from the instrument panel 5, forms an optical path 31 for infrared light and imaging light, emitting infrared light (position detection light) and receiving imaging light. The rear protective cover 32 is made of a resin that transmits infrared light and absorbs visible light (for example, polycarbonate which appears black to the human eye), preventing the intrusion of dust and other debris and shielding the driver 4 from seeing inside the rear opening 33. In addition, the rear protective cover 32, like the front protective cover 22, is designed so that when ambient light S such as sunlight is incident, the reflected light R is directed towards the instrument panel 5 side of the vehicle 1 rather than towards the windshield 3. Specifically, the rear protective cover 32 (rear opening 33) has a concave shape that is higher at the front (windshield 3 side) and lower towards the rear (driver 4 side). In this configuration, by setting at least the lower end 32a of the rear protective cover 32 (the lowest end along the left-right direction) lower than the upper end 22a of the front protective cover 22 (the highest end along the left-right direction), the reflected light R of the ambient light S incident on the rear protective cover 32 can be suitably directed towards the instrument panel 5. 【0025】 Furthermore, the instrument panel 5 is opaque and light-absorbing, which helps to suppress further reflected light from the instrument panel 5 from being directed towards the windshield 3. 【0026】 The housing 17 has an exposed portion 17b at the boundary between the front housing portion 20 and the rear housing portion 30 on the upper surface 17a facing upward, which is the uppermost part on the upper surface 17a and is exposed from the instrument panel 5 on which the HUD 10 is mounted. The exposed portion 17b has a structure that absorbs or reduces the reflectivity of light incident on the exposed portion 17b. In Figure 2, the exposed portion 17b is illustrated using black dots to make it clear (similar to Figures 5, 6, 9, and 12). For example, the exposed portion 17b may be formed of a black (black painted) material with a high light absorption rate in at least the visible light region, or it may have a microstructure with low reflectivity. Ideally, the exposed portion 17b should be covered by the instrument panel 5, like the rest of the upper surface 17a, but this may be difficult from a design perspective. Therefore, by having the exposed portion 17b have the structure described above, it is possible to reduce the amount of reflected light such as ambient light that enters the exposed portion 17b that is directed towards the windshield 3 or visible to the driver 4. 【0027】 Here, it is conceivable to give optical elements such as the plane mirror 12 and the concave mirror 13 the function of transmitting infrared light, and to arrange the illumination unit 14 and the imaging unit 15 on the opposite side of the reflective surface of the optical elements, thereby making the optical path that overlaps with the optical path 21 of the display light the optical path of the infrared light and the imaging light. However, this may complicate the structure of the optical elements, reduce manufacturability, and limit the field of view of the imaging unit 15. 【0028】 In contrast, in this embodiment, the HUD 10 arranges the display unit 11, plane mirror 12, concave mirror 13, illumination unit 14, and imaging unit 15 within the housing 17 so that the optical path 21 of the display light having optical axis L1 and the optical paths 31 of the infrared light and imaging light having optical axes L2 and L3 do not overlap. As a result, the HUD 10 can reduce interference between the display light and the infrared light and imaging light, and maintain the visibility of the driver's image. Furthermore, the HUD 10 can also suitably detect infrared light in the imaging unit 15, suitably capture the driver's face, and consequently obtain accuracy in calculating the eye position. 【0029】 Furthermore, the HUD 10 sets the projection position of the optical axis L3 (infrared light optical axis L2) of the imaging light from the imaging unit 15 onto the windshield 3 to be close to the driver's eyes (face). As a result, the imaging unit 15 can capture the driver's face at a position close to the sagittal plane of the driver's face (the plane that runs along the front-back and up-down directions and is located at the left-right center of the face). In addition, the optical axis L2 is less likely to be obstructed by structural parts of the vehicle 1 such as the steering wheel 6. Therefore, the HUD 10 can suitably capture the driver's face and improve the accuracy of eye position calculation. 【0030】 The configuration of the rear housing section 30 in the HUD 10 described above is just one example, and the display device according to the present invention may be configured as shown in the first to fourth modified examples below. 【0031】 Figure 4 is an explanatory diagram showing an example configuration of the HUD 110 as a first modified example mounted on vehicle 1. Figure 5 is an external perspective view of the HUD110. 【0032】 In the following first to fourth modified examples, the same reference numerals are used for components and parts corresponding to the HUD10, and redundant explanations are omitted. 【0033】 The difference between the HUD110 and the HUD10 is that the rear protective cover 132 (rear opening 133) is formed so that it is lower at the front (windshield 3 side) and higher towards the rear (driver 4 side). In this case, at least the lower end 132a of the rear protective cover 132 (the lowest end that runs along the left-right direction) is set lower than the upper end 22a of the front protective cover 22 (the highest end that runs along the left-right direction). 【0034】 As shown in Figure 5, the boundary between the front housing section 20 and the rear housing section 130 on the upper surface 117a of the housing 117 is the uppermost part on the upper surface 117a and is the exposed section 117b. The surface opposite to the upper surface 117a that forms the front housing section 20 at this boundary is the surface that covers the front side of the rear opening 133. This surface functions as a light-absorbing section 117c that absorbs light reflected by the rear protective cover 132. 【0035】 The shape of the rear protective cover 132 described above is such that the reflected light R of the ambient light S incident on the rear protective cover 132 is directed toward the light-absorbing portion 117c, and by absorbing the reflected light R in the light-absorbing portion 117c, the amount of reflected light R directed toward the windshield 3 can be reduced. 【0036】 Figure 6 is an external perspective view of the HUD210 as a second modified example. Figure 7 is an explanatory diagram showing the HUD210 from Figure 6 from above. Figure 8 is a cross-sectional view along the line VIII-VIII in Figure 7. 【0037】 The difference between the HUD210 and the HUD10 is that the rear opening 33 consists of two parts: an illumination-side opening 233a covered by an illumination-side protective cover 232a, and an imaging-side opening 233b covered by an imaging-side protective cover 232b. 【0038】 The illumination unit side protective cover 232a (illumination unit side opening 233a) has a concave shape that is higher on the right and lower towards the left. The imaging unit side protective cover 232b (imaging unit side opening 233b) is formed symmetrically with respect to the surface along the front-rear and up-down directions of the illumination unit side protective cover 232a, and has a concave shape that is higher on the left and lower towards the right. In this case, at least the lower ends 234a, 234b (the lowest ends along the front-rear direction) of the illumination unit side protective cover 232a and the imaging unit side protective cover 232b are set to a position lower than the upper end 22a (the highest end along the left-right direction) of the front protective cover 22. 【0039】 In the housing 217, as shown in Figure 6, the upper surface 217a, where the boundary portion 218a between the front housing portion 20 and the rear housing portion 230, the boundary portion 218b between the illumination-side opening 233a and the imaging-side opening 233b, the right side 218c of the illumination-side opening 233a, and the left side 218d of the imaging-side opening 233b are the uppermost parts on the upper surface 217a and form the exposed portion 217b. Furthermore, a pair of surfaces located at the boundary portion 218b between the illumination-side opening 233a and the imaging-side opening 233b, and facing the illumination-side opening 233a and the imaging-side opening 233b, function as light-absorbing portions 217c that absorb light reflected by the illumination-side protective cover 232a and the imaging-side protective cover 232b. 【0040】 The shapes of the illumination-side protective cover 232a and the imaging-side protective cover 232b described above are such that the reflected light R of the ambient light S incident on the illumination-side protective cover 232a and the imaging-side protective cover 232b is directed toward the light-absorbing part 217c. By absorbing the reflected light R in the light-absorbing part 217c, the amount of reflected light R directed toward the windshield 3 can be reduced. 【0041】 Figure 9 is an external perspective view of the HUD310 as a third modified example. Figure 10 is an explanatory diagram showing the HUD310 from Figure 9 from above. Figure 11 is a cross-sectional view along the line XI-XI in Figure 10. 【0042】 The main differences between the HUD310 and the HUD210 are that the illumination-side opening 333a, covered by the illumination-side protective cover 332a, and the imaging-side opening 333b, covered by the imaging-side protective cover 332b, are located on the left and right ends of the housing 317, and the instrument panel 5 is used instead of the light-absorbing section 217c. 【0043】 The illumination unit side protective cover 332a (illumination unit side opening 333a) has a concave shape that is higher on the left and lower towards the right. The imaging unit side protective cover 332b (imaging unit side opening 233b) is formed symmetrically with respect to the surface along the front-rear and up-down directions of the illumination unit side protective cover 332a, and has a concave shape that is higher on the right and lower towards the left. In this case, at least the lower ends 334a, 334b ​​(the lowest ends along the front-rear direction) of the illumination unit side protective cover 332a and the imaging unit side protective cover 332b are set to a position lower than the upper end 22a (the highest end along the left-right direction) of the front protective cover 22. 【0044】 In the housing 317, as shown in Figure 9, at least a portion of the upper surface 317a, specifically the boundary portion 318a between the front housing section 20 and the rear housing section 330, and the boundary portion 318b between the illumination section opening 333a and the imaging section opening 233b, forms the exposed portion 317b. In this case, as shown in Figures 10 and 11, the area of ​​the exposed portion 317b can be reduced by making a portion 5a of the instrument panel 5 protrude forward and covering at least a portion of the boundary portion 318b between the illumination section opening 333a and the imaging section opening 333b. 【0045】 The shapes of the illumination-side protective cover 332a and the imaging-side protective cover 332b described above are designed so that the reflected light R of the ambient light S incident on the illumination-side protective cover 332a and the imaging-side protective cover 332b is directed toward the instrument panel 5 side of the vehicle 1, that is, toward the left and right inner surfaces 5b in Figure 11. As a result, the reflected light R is absorbed by the left and right inner surfaces 5b of the instrument panel 5, thereby reducing the amount of reflected light R directed toward the windshield 3 side. 【0046】 Figure 12 is an external perspective view of the HUD410 as a fourth modified example. Figure 13 is an explanatory diagram showing the HUD410 from Figure 12 from above. Figure 14 is a cross-sectional view along the line XIV-XIV in Figure 13. 【0047】 The main difference between the HUD410 and the HUD210 is that the illumination-side opening 433a, covered by the illumination-side protective cover 432a, is located on the right end of the housing 417, while the imaging-side opening 433b, covered by the imaging-side protective cover 432b, is located on the left end. 【0048】 In the housing 417, as shown in Figure 12, at least a portion of the upper surface 417a, specifically the boundary portion 418a between the front housing 20 and the rear housing 430, the right side 418b of the illumination unit side opening 433a, and the left side 418c of the imaging unit side opening 433b, forms the exposed portion 417b. At this time, as shown in Figures 13 and 14, a portion 5a of the instrument panel 5 is made to protrude forward, and at the same time, a portion 5a is made to protrude from the downward-facing surface of this portion 5a so as to form a surface that runs along the front-rear and up-down directions, thereby forming a pair of surfaces 5c. 【0049】 The shapes of the illumination-side protective cover 432a and the imaging-side protective cover 432b described above are designed to direct the reflected light R of the ambient light S incident on the illumination-side protective cover 432a and the imaging-side protective cover 432b toward a pair of surfaces 5c of the instrument panel 5, respectively. As a result, the reflected light R is absorbed by the pair of surfaces 5c of the instrument panel 5, reducing the amount of reflected light R directed toward the windshield 3. 【0050】 Furthermore, the illumination-side protective cover 432a (illumination-side opening 433a) and the imaging-side protective cover 432b (imaging-side opening 433b) may be formed as a single continuous piece in the left-right direction. This reduces the number of parts in the HUD 410 and simplifies the assembly process. 【0051】 While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. 【0052】 Although an example has been described in which the projection members of HUD10, 110, 210, 310, and 410 are windshields 3, a combiner may be used instead of, or in conjunction with, these. 【0053】 Furthermore, the front protective cover 22, the rear protective covers 32 and 132, the illumination unit side protective covers 232a, 332a, and 432a, and the imaging unit side protective covers 232b, 332b, and 432b are not limited to curved shapes as described above, but may also be planar in shape. [Explanation of symbols] 【0054】 1 vehicle 3. Windshield (projection element) 4. Driver (Observer) 5. Instrument Panel 6 Steering 10, 110, 210, 310, 410 Head-Up Display (HUD) (Display Device) 11 Display section 12 plane mirror 13 concave mirror 14 Lighting Section 15 Imaging Unit 16 Control board 17, 117, 217, 317, 417 cabinets 17a, 117a, 217a, 317a, 417a Top 17b, 117b, 217b, 317b, 417b Exposed part 20 Forward storage compartment 21 Light path 22 Front protective cover 22a top end 23 Front aperture (display light aperture) 30, 130, 230, 330, 430 a Rear storage area 31 Light path 32, 132 Rear protective cover (infrared light transmitting cover) 32a, 132a, 234a, 234b, 334a, 334b ​​bottom edge 33, 133, 233, 333, 433 Rear aperture (detection light aperture) 117c, 217c light absorption part 130, 430 Rear storage compartment 218a, 218b, 418a border area 232a, 332a, 432a Illumination section side protective cover (infrared light transmitting cover) 232b, 332b, 432b Imaging unit side protective cover (infrared light transmitting cover) 233a, 433a Illumination side aperture (detection light aperture) 233b, 433b Imaging unit side aperture (detection light aperture) 318a, 318b border area L1, L2, L3 optical axis R Reflected light S (Outdoor light) V Illusion

Claims

[Claim 1] A display unit that emits display light related to an image and projects it onto a projection member, and causes the reflected light to be perceived as a virtual image in front of the projection member by a viewer positioned behind the projection member, A lighting unit that emits position detection light and projects it onto the projection member, and illuminates the face of the viewer with the reflected light, An imaging unit captures imaging light, which is the position detection light, that is sequentially reflected by the viewer and the projection member. It comprises a housing that houses the display unit, the illumination unit, and the imaging unit, A display device in which the display unit, the illumination unit, and the imaging unit are arranged within the housing such that the optical paths of the display light, the position detection light, and the imaging light do not overlap, and the projection positions of the position detection light and the imaging light on the projection member are closer to the viewer's eye than the projection position of the display light on the projection member. [Claim 2] The display device according to claim 1, wherein the display unit, the illumination unit, and the imaging unit are arranged such that the position of the position detection light exiting the housing and the position of the imaging light entering the housing are rearward of the position of the display light exiting the housing. [Claim 3] The display device according to claim 1, wherein the display unit, the illumination unit, and the imaging unit are arranged such that the projection positions of the position detection light and the imaging light on the projection member are above and behind the projection position of the display light. [Claim 4] The display device according to claim 1, wherein the housing has a display light aperture for emitting the display light and a detection light aperture for emitting the position detection light and for which imaging light is incident. [Claim 5] The position detection light is infrared light, The display device according to claim 4, wherein the detection light aperture is covered with an infrared light-transmitting cover that blocks visible light and transmits infrared light. [Claim 6] The housing has a light-absorbing section that absorbs light, The display device according to claim 5, wherein the infrared light-transmitting cover directs the reflected light of light incident on the infrared light-transmitting cover toward the light-absorbing portion. [Claim 7] The display device according to claim 5, wherein the infrared light-transmitting cover directs the reflected light of light incident on the infrared light-transmitting cover toward the mounting location of the display device. [Claim 8] The housing has an exposed portion that is exposed from the mounting surface of the display device, The display device according to claim 1, wherein the exposed portion has a structure that absorbs or reduces the reflectivity of light incident on the exposed portion.

Images