Image display unit

Abstract

To acquire a high-definition picked-up image and display a natural and high-quality composite image in an image display unit.SOLUTION: An image display unit has: an imaging device that picks up an image of the outside world through an imaging optical system 103 to create a picked-up image; a display element 106 that displays a composite image of the picked-up image and a virtual image; a display optical system 107 that guides light from the display element to the eyes of an observer; acquisition means 108 that acquires a fixation distance that is a distance to a fixation point of the observer in the outside world; and control means 205 that controls focusing of the imaging device according to the fixation distance. The pupil diameter of the imaging optical system is 1.3 mm or more and 4.0 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an image display device that displays images using a video camera and a display element. [Background technology]

[0002] Mixed reality (MR) technology and augmented reality (AR) technology display a composite image that combines a real image, which is an image of the outside world captured by a video camera, with a virtual image created by CG (Computer Graphics) or the like. Video see-through image display devices that perform such a display include those disclosed in Patent Documents 1 and 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-133725 [Patent Document 2] U.S. Patent No. 10,733,800 Summary of the Invention [Problem to be solved by the invention]

[0004] In a video see-through display device, in order to display a high-quality composite image that is natural to humans, it is necessary to increase the resolution of not only the virtual image but also the captured image. However, Patent Documents 1 and 2 do not disclose a specific method for acquiring such high-resolution captured image.

[0005] The present invention provides an image display device that can acquire high-definition captured images and display natural, high-quality composite images. [Means for solving the problem]

[0006] An image display device according to one aspect of the present invention includes an imaging device that generates a captured image by capturing an image of the outside world through an imaging optical system, a display element that displays a composite image of the captured image and a virtual image, a display optical system that directs light from the display element to an observer's eye, an acquisition unit that acquires a gaze distance that is the distance to the observer's gaze point in the outside world, and a control unit that controls focusing of the imaging device in accordance with the gaze distance. The imaging optical system has a pupil diameter of 1.3 mm or more and 4.0 mm or less. [Effects of the Invention]

[0007] According to the present invention, it is possible to acquire a high-definition captured image and display a natural, high-quality composite image. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing the configuration of an image display device according to a first embodiment. [Figure 2] FIG. 10 is a diagram showing the relationship between the convergence angle and the distance to the point of gaze. [Figure 3] FIG. 4 is a diagram showing focusing in the first embodiment. [Figure 4] FIG. 10 is another diagram showing focusing in the first embodiment. [Figure 5] 10 is a graph showing the relationship between the pupil diameter of an imaging optical system and the best focus MTF. [Figure 6] FIG. 2 is a diagram showing the relationship between the pupil diameter and the depth of field of an imaging optical system. [Figure 7] 4 is a graph showing the MTF of the imaging optical system in the first embodiment. [Figure 8] FIG. 3 is a diagram showing a real image in the first embodiment. [Figure 9] FIG. 10 is another diagram showing a real image in the first embodiment. [Figure 10] FIG. 3 is a diagram showing a composite image in the first embodiment. [Figure 11] 4 is a diagram showing the relationship between the focal length of the imaging optical system and the object distance as camera parameters in the first embodiment. FIG. [Figure 12] FIG. 4 is a diagram showing the relationship between the object distance and the number of pixels of the image sensor in the first embodiment. [Figure 13] 10A and 10B are graphs showing the MTF of the imaging optical system in the second embodiment. [Figure 14] FIG. 10 is a diagram showing a real image in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [Example]

[0010] Fig. 1 shows the configuration of a video see-through type HMD (Head Mounted Display) 100 as an image display device of Example 1. Fig. 1 is a vertical cross-sectional view, and the +Z axis is defined as the direction of the visual axis of an observer's eye 102, and the X axis (horizontal direction) and Y axis (vertical direction) relative to the Z axis are defined in right-handed coordinates.

[0011] The imaging device 101 has an imaging optical system 103, an imaging element 104, and a focus driver 201, and generates a captured image as image data by capturing an image of an object 105 in the external world (real world) through the imaging optical system 103. The imaging element 104 is a photoelectric conversion element that photoelectrically converts (captures) the external world image formed by the imaging optical system 103, and is configured with a CCD sensor, a CMOS sensor, or the like. Note that a distance L2 from the pupil of the imaging optical system 103 to the object 105 is the object distance.

[0012] The display optical system 107 directs light from a display element 106 that displays an image (video) to the eye 102, which is positioned at the pupil (exit pupil) of the display optical system 107, thereby presenting an enlarged virtual image of the displayed image to the viewer. As the display optical system, not only a refractive system but also a reflective system using polarized light can be used. The display optical system 107 of this embodiment has a horizontal angle of view of 80° and a vertical angle of view of 70°. The display element 106 is configured by an organic EL element, a liquid crystal display, or the like. The optical axis of the display optical system 107 and the optical axis of the imaging optical system 103 coincide with each other in both the YZ cross section and the XZ cross section of FIG. 1 . In the following description, the direction in which the optical axis extends (the Z-axis direction) is referred to as the optical axis direction.

[0013] Note that FIG. 1 shows the display element 106 and the display optical system 107 provided for one of the observer's eyes, but in reality, the display element 106 and the display optical system 107 are also provided for the other eye.

[0014] The pupil of the imaging optical system 103 and the pupil of the display optical system 107, where the viewer's eye 102 is located, are separated in the optical axis direction (Z-axis direction) by a distance L1. In this embodiment, L1 = 35 mm. If L1 is too large, the difference from the actual human appearance becomes too large, so it is desirable that L1 be 60 mm or less.

[0015] In this embodiment, the image capture device 101 displays an image corresponding to a part of the angle of view θ2 among the angles of view that can be captured by the imaging optical system 103 and the image sensor 104 on the display element 106. The angle of view θ2 of the captured image and the angle of view θ1 of the display optical system coincide with each other.

[0016] Infrared camera 108, which serves as a gaze detection sensor, captures an image of the eyeball illuminated with infrared light from infrared light source 109. Controller 205, which serves as control means, is composed of a CPU and the like, analyzes the eyeball image from infrared camera 108 to detect the gaze of eye 102 (i.e., the viewer's gaze direction), and further calculates (acquires) the viewer's gaze distance from the gaze, as will be described later. Infrared camera 108, infrared light source 109, and controller 205 constitute acquisition means.

[0017] Furthermore, the controller 205 controls the driving of the image sensor 104 of the image pickup device 101 and the focus driver 201 .

[0018] The image processing circuit 111, which serves as a generating means, generates a composite image by combining the captured image generated by the imaging device 101 with a virtual image created by CG or the like. At this time, the controller 205 transmits information on the viewer's gaze direction and gaze distance, as well as information on the posture of the HMD 100 (movement of the viewer's head) detected by a posture sensor (not shown), to the image processing circuit 111. The image processing circuit 111 may be built into the HMD 100, or may be provided outside the HMD 100 and connected to the HMD 100 so as to be communicable with the HMD 100 via wire or wirelessly.

[0019] 2 shows a state in which a person is gazing at a gaze point 110 (object 105 in FIG. 1) in the outside world with both eyes (right eye 102R and left eye 102L) as viewed from above. The lines of sight of the right eye 102R and left eye 102L, which are looking at the gaze point 110, intersect at the gaze point 110 at a convergence angle θ3. The relationship shown in the following equation (1) exists among the gaze distance L3, which is the distance from both eyes to the gaze point 110, the convergence angle θ3, and the interocular distance I, which is the distance between the right eye 102R and the left eye 102L.

[0020]

number

[0021] By detecting the line of sight and determining the convergence angle θ3, the gaze distance L3 can be calculated from equation (1). In the configuration of this embodiment shown in FIG. 1, the observer is observing the object 105 using an image captured with the optical axis aligned, so L2 can be obtained by determining the convergence angle of the observer. In this case, the average human eye width distance may be used as the value of I, or I for each observer may be determined using the detected line of sight and used.

[0022] 3 and 4 show focusing of the imaging device 101. The focus driver 201 is an actuator such as a voice coil motor, and moves at least a part of the imaging optical system 103 or the imaging element 104 in the optical axis direction to perform focusing on the object 105. In this embodiment, a case where focusing is performed by moving the entire imaging optical system 103 will be described.

[0023] Fig. 3 shows a state in which focusing is performed on an object 105 located at a distance, and in this state, the imaging optical system 103 is moved so as to shorten the distance between it and the image sensor 104. Fig. 4 shows a state in which focusing is performed on an object 105 located at a close distance, and in this state, the imaging optical system 103 is moved so as to lengthen the distance between it and the image sensor 104 compared to the state in Fig. 3. As described above, the controller 205 controls the focus driver 201 in accordance with the gaze distance L3 calculated from the lines of sight of the right eye 102R and the left eye 102L (i.e., the convergence angle θ3), to perform focusing on the object 105.

[0024] The relationship between the resolution of a real image as a captured image and the pupil diameter of the imaging optical system 103 will be described below. Here, the pupil diameter refers to the entrance pupil diameter of the imaging optical system 103. Here, various characteristics of the imaging device 101 are converted into cycles per degree (CPD), which is the cycles per angle on the object side to be captured, rather than Line Pair / mm, which is the scale on the imaging surface of the image sensor 104. This is because the captured image reproduces the real world as seen by an observer (human). When the focal length of the imaging optical system 103 is f (mm) and the pixel pitch of the image sensor 104 is p (mm), the maximum CPDmax that can be sampled is expressed by the angle that the pixel pitch p forms per object side angle, as shown in the following equation (2):

[0025]

number

[0026] When converted to an evaluation using the Landolt ring, which is an evaluation index for human visual acuity, it can be said that a 1-minute resolution of 1 pixel is capable of displaying a pattern equivalent to visual acuity of 1.0. For this reason, a CPDmax of 30 is considered one target for expressing a natural human appearance. Furthermore, although the MTF of the imaging optical system 103 is usually evaluated in LP / mm units on the image side, it can also be expressed in terms of CPD, and in the paraxial region it is expressed as in equation (3) below.

[0027]

number

[0028] From equation (3), when the MTF characteristics of the imaging optical system 103, where the focal length is f (mm) and the pupil diameter is D (mm), i.e., the F-number is f / D, are organized in CPD units, it can be seen that the MTF characteristics of an ideal, aberration-free imaging optical system 103 are determined not by the F-number but by the pupil diameter D. Figure 5 shows the relationship between the pupil diameter D and MTF at the best image plane (best focus position), and shows that the larger the pupil diameter D, the higher the MTF can be ensured even in high CPD regions.

[0029] On the other hand, the depth of field becomes shallower as the pupil diameter D increases. When considering using the imaging optical system 103 in a pan-focus mode without focusing, a target MTF of approximately 0.3 must be achieved within a depth range of ±1.5 diopters (1 / m) from the reference object distance. Figure 6 shows the relationship between the pupil diameter D and the maximum CPD at which an MTF of 0.3 can be achieved within a depth range of ±1.5 diopters from the reference object distance. As can be seen from Figure 6, if the pupil diameter D is 0.6 mm or greater but less than 1.3 mm, 10 CPD can be achieved, ensuring a sufficient depth of field. Therefore, an imaging optical system with a CPDmax of approximately 10 CPD can utilize the performance of the image sensor 104 even without focusing. On the other hand, if the imaging optical system 103 is pan-focused, the resolution of the image sensor 104 cannot be fully utilized in a range where the CPDmax exceeds 15 CPD.

[0030] If CPDmax is 15 CPD or more, a real image with relatively high resolution can be obtained. In other words, it is desirable to satisfy the condition πf / (360p)≧15.0. It is more preferable that CPDmax is 20 CPD or more. In the region where CPDmax exceeds 15 CPD, by setting the pupil diameter D to 1.3 mm or more and ensuring a high MTF at the best focus position shown in Figure 5 through focusing, a real image with high resolution close to what the human eye sees can be obtained. In this embodiment, the pixel pitch of the image sensor 104 is 1.5 μm, the focal length of the imaging optical system 103 is 3.45 mm, and the CPDmax is 20 CPD. The pupil diameter D is 2.0 mm, and the F-number is 1.725.

[0031] In Figure 7, the through-focus MTF for the axial angle of view at 20 CPD for the imaging optical system 103 of this embodiment is shown by a solid line, and for reference, the through-focus MTF for a pupil diameter of 1.0 mm is also shown by a dashed line. As can be seen from Figure 7, when the pupil diameter D is 2.0 mm as in this embodiment, focusing at the viewing distance L3 ensures a high MTF that takes advantage of the CPDmax performance. In contrast, when the pupil diameter D is 1.0 mm, the CPDmax performance cannot be taken advantage of.

[0032] To accommodate a higher CPDmax, as can be seen from Figure 5, it is preferable that the pupil diameter be D1.7 mm or greater, at which the MTF of the aplanatic lens at 30 CPD is 0.3 or greater. The larger the pupil diameter, the higher the resolving power, but it is difficult to achieve an extremely small F-number, which results in a longer focal length for the imaging optical system 103 and is disadvantageous for miniaturizing the HMD 100. For this reason, it is preferable that the pupil diameter D be less than 4.0 mm, which is the same as the diameter of the human pupil when observing an image.

[0033] 8 and 9 show real images observed by the HMD 100 of this embodiment. Fig. 8 shows a real image in a state where the observer is gazing at a hand 801 as a close-up object. In this real image, the focused hand 801 is observed with high contrast. On the other hand, background objects 802, such as a tree, a house, and the sun, outside the depth of field, are observed blurred.

[0034] 9 shows a real image in which an observer is gazing at a house 901 as a distant object. In this real image, the focused house 901 is observed with high contrast, while the hand 801, which is outside the depth of field, is observed in a blurred state. The appearance at this time is close to what a human would actually see through their eyes, and therefore, in addition to high resolution, a natural appearance is achieved.

[0035] To provide a sense of mixed reality to an observer, the observer is shown a composite image in which a CG virtual object (virtual image) is superimposed (combined) onto a real image. Figure 10 shows a composite image in which background objects 1001, such as a tree, house, and sun, are superimposed as virtual objects while the observer is gazing at a close-up hand 801, and the virtual objects are rendered at high resolution. In this case, both the hand 801 and the background object 1001 are rendered at high resolution.

[0036] However, it is desirable to more naturally express the blurring of the background object 1001 within the depth of field. In this case, the controller 205 causes the image processing circuit 111 to perform blurring processing using a Gaussian filter or the like on virtual objects outside the predetermined depth of field, which in this embodiment are at a distance of ±0.5D or more from the gaze distance, to generate a synthetic image. This makes it possible to reproduce the difference in appearance between inside and outside the depth of field in the synthetic image, as shown in FIG. 8, and to achieve both high resolution and natural appearance even in the presentation of mixed reality.

[0037] Superimposing a virtual image on a real image requires information about camera parameters, a concept used in computer vision, i.e., external and internal parameters of the imaging device 101. When the imaging device 101 is focused, the internal parameters of the imaging device 101 (hereinafter referred to as internal camera parameters) required to superimpose a virtual image on a real image change, resulting in errors in the relationship between the positions and sizes of the real and virtual images. For this reason, in this embodiment, data indicating the relationship between the adjustment amount and the internal camera parameters is stored in the image processing circuit 111 so that the internal camera parameters can be changed according to the adjustment amount (movement amount of the imaging optical system 103) during focusing of the imaging device 101. By referring to this data, the position and size of the virtual image relative to the real image can be appropriately set even when focusing is performed, making it possible to generate a composite image that can be viewed naturally and has no (or little) error in the positions and sizes of the real and virtual images.

[0038] FIG. 11 shows the relationship between the focal length of the imaging optical system 103, which is one of the camera internal parameters in this embodiment, and the in-focus object distance (1 / m). The focal length is a value normalized by the pixel pitch of the image sensor 104. From FIG. 11, it can be seen that the closer the in-focus object distance, the greater the focal length must be. When focusing to the gaze distance, by adjusting the focal length, that is, the imaging magnification, based on this relationship, it is possible to generate a composite image that allows for natural observation with no errors in the position or size of the real image and the virtual image.

[0039] The camera parameters may include the center position of the captured image, distortion correction value, principal point position, etc., and these may be changed in conjunction with the gaze distance for focusing.

[0040] Furthermore, the angle of the chief ray of the imaging optical system 103 relative to the image sensor 104 is generally a value other than 0. In other words, the magnification of the real image changes due to focusing. In this embodiment, the horizontal angle of view of the imaging optical system 103 is 80°, and the number of pixels of the image sensor 104 corresponding to the horizontal angle of view of 80° in response to focusing, i.e., the magnification, is held in the image processing circuit 111.

[0041] Fig. 12 shows the relationship between the in-focus object distance (1 / m) and the number of pixels (pixels) of the image sensor 104 corresponding to a horizontal angle of view of 80° in this embodiment. From Fig. 12, it can be seen that the closer the in-focus object distance, the more pixels of the image sensor 104 must be increased. When focusing to the gaze distance, by adjusting the number of pixels of the image sensor 104 based on this relationship, it is possible to generate a composite image that allows for natural observation without changing the magnification of the real image even when focusing.

[0042] An appropriate number of pixels is also set for the vertical angle of view, and the details are the same as for the horizontal angle of view, so a detailed description thereof will be omitted.

[0043] According to the present embodiment described above, it is possible to obtain a high-definition captured image and realize an HMD capable of displaying a natural, high-quality composite image. [Example]

[0044] Next, a description will be given of Example 2. The basic configuration of the HMD in Example 2 is the same as that of the HMD 100 in Example 1, and the same reference numerals are used to designate the common components.

[0045] In the imaging device 101 of this embodiment, the focal length of the imaging optical system 103 is 6.9 mm, the pixel pitch p of the image sensor 104 is 2.0 μm, and the CPDmax is 30 CPD. The pupil diameter D of the imaging optical system 103 is 3.0 mm, and the F-number is 2.3.

[0046] 13 shows the through-focus MTF of the on-axis angle of view at 30 CPD of the imaging optical system 103 of this embodiment with a dashed line. The imaging optical system 103 of this embodiment has a configuration that can ensure high MTF by focusing even at a frequency of CPDmax.

[0047] Humans have a high ability to distinguish only the area of ​​focus near the fovea, and do not notice a decrease in resolution outside that area. Taking advantage of this human characteristic, a high-resolution image is generated in the area of ​​approximately 10° to 20° including the position (coordinates) corresponding to the point of gaze in the captured image, and the image resolution is reduced to approximately half in the area outside that area (periphery). This reduces the amount of image data processed by the image processing circuit 111. In this embodiment, a high MTF is first ensured by focusing the imaging optical system 103 according to the observer's gaze distance, and an image is generated with a resolution of 2.0 μm pixel pitch in a rectangular area of ​​±10° centered on the position corresponding to the point of gaze in the captured image. On the other hand, in the area outside that rectangular area, an image is generated with a resolution equivalent to a pixel pitch of 4.0 μm by binning (smoothing or adding multiple pixels to obtain a single pixel value). Specifically, for example, the number of captured frames per second is set to double the number of displayed frames per second. Then, in even-numbered imaging frames, high-resolution image data is acquired with the rectangular range as a region of interest (ROI), and in odd-numbered imaging frames, image data obtained by binning the entire region is acquired and then combined.

[0048] 14 shows a real image (captured image) including a high-resolution region 401 as a region of interest ROI and an outer low-resolution region 402. The hand 801 that the observer is gazing at is a real hand. In this embodiment, the controller 205 causes the imaging device 101 to focus on the hand to ensure a high MTF, while causing the image processing circuit 111 to perform processing to reduce the resolution of the low-resolution region 402 to half that of the high-resolution region 401.

[0049] When a virtual image is superimposed on a real image to present a mixed reality, the controller 205 causes the image processing circuit 111 to render the region of interest ROI at high resolution and the surrounding area at low resolution, thereby reducing the overall amount of data processing.

[0050] The above embodiment includes the following configurations.

[0051] (Configuration 1) an imaging device that captures an image of the outside world through an imaging optical system to generate a captured image; a display element that displays a composite image of the captured image and a virtual image; a display optical system that guides light from the display element to the viewer's eye; an acquisition means for acquiring a gaze distance, which is a distance to a gaze point of the viewer in the external world; a control unit for controlling focusing of the imaging device in accordance with the gaze distance; 1. An image display device, wherein the pupil diameter of the imaging optical system is 1.3 mm or more and 4.0 mm or less. (Configuration 2) 2. The image display device according to configuration 1, further comprising a generating means for generating the composite image. (Configuration 3) the imaging device has an imaging element that captures an external image formed by the imaging optical system, When the focal length of the imaging optical system is f (mm) and the pixel pitch of the imaging element is p (mm), πf / (360p)≧15.0 3. The image display device according to configuration 1 or 2, which satisfies the following conditions: (Configuration 4) 4. The image display device according to any one of configurations 1 to 3, wherein the control means changes a camera parameter in a generation means that generates the composite image in accordance with an adjustment amount in the focusing. (Configuration 5) 5. The image display device according to any one of configurations 1 to 4, wherein the control means changes the imaging magnification of the imaging device. (Configuration 6) The image display device according to any one of configurations 1 to 5, wherein the control means causes the generation means that generates the composite image to perform processing to make a region of the captured image that includes a position corresponding to the point of interest higher in resolution than a region outside of that region. (Configuration 7) The image display device according to any one of configurations 1 to 6, wherein the control means causes the generation means that generates the composite image to perform processing to make a region of the virtual image that includes a position corresponding to the point of interest higher in resolution than a region outside of that region. (Configuration 8) The image display device described in any one of configurations 1 to 7, characterized in that the control means causes the generation means that generates the synthetic image to perform a blurring process on an area of ​​the virtual image that corresponds to a distance farther than the gaze distance. (Configuration 9) the optical axis of the imaging optical system and the optical axis of the display optical system are aligned with each other, 9. The image display device according to any one of configurations 1 to 8, wherein the pupil of the imaging optical system and the pupil of the display optical system are spaced apart from each other by a distance of 60 mm or less in the optical axis direction. (Configuration 10) 10. The image display device according to any one of configurations 1 to 9, wherein the acquisition means detects the line of sight of the viewer and acquires the gaze distance based on the line of sight.

[0052] (Other Examples) The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program.The present invention can also be realized by a circuit (e.g., ASIC) that realizes one or more functions.

[0053] The embodiments described above are merely representative examples, and various modifications and alterations are possible to each embodiment when implementing the present invention. [Explanation of symbols]

[0054] 101 HMD 102 Eyes 103 Imaging optical system 104 Image sensor 106 Display element 107 Display optical system 108 Infrared Camera 109 Infrared Light Source 111 Image processing circuit 201 Focus drive unit 401 High resolution area 402 Low resolution area

Claims

1. an imaging device that captures an image of the outside world through an imaging optical system to generate a captured image; a display element that displays a composite image of the captured image and a virtual image; a display optical system that guides light from the display element to the viewer's eye; an acquisition means for acquiring a gaze distance, which is a distance to a gaze point of the viewer in the external world; a control unit for controlling focusing of the imaging device in accordance with the gaze distance; An image display device, characterized in that the pupil diameter of the imaging optical system is 1.3 mm or more and 4.0 mm or less.

2. 2. The image display device according to claim 1, further comprising a generating unit for generating the composite image.

3. the imaging device has an imaging element that captures an external image formed by the imaging optical system, When the focal length of the imaging optical system is f (mm) and the pixel pitch of the imaging element is p (mm), πf / (360p)≧15.0 2. The image display device according to claim 1, wherein the following conditions are satisfied:

4. 2. The image display device according to claim 1, wherein the control means changes a camera parameter in a generating means that generates the composite image in accordance with an adjustment amount in the focusing.

5. 5. The image display device according to claim 4, wherein the control means changes the imaging magnification of the imaging device.

6. The image display device according to claim 1, characterized in that the control means causes the generation means that generates the composite image to perform processing to make the area of ​​the captured image that includes the position corresponding to the point of interest higher in resolution than the area outside of that area.

7. The image display device according to claim 1, characterized in that the control means causes the generation means that generates the synthetic image to perform processing to make the area of ​​the virtual image that includes the position corresponding to the point of interest higher in resolution than the area outside of that area.

8. 2. The image display device according to claim 1, wherein the control means causes the generating means that generates the synthetic image to perform blurring on an area of ​​the virtual image that corresponds to a distance farther than the gaze distance.

9. the optical axis of the imaging optical system and the optical axis of the display optical system are aligned with each other, 2. The image display device according to claim 1, wherein the pupil of the imaging optical system and the pupil of the display optical system are spaced apart from each other by a distance of 60 mm or less in the optical axis direction.

10. 2. The image display device according to claim 1, wherein the acquisition means detects the line of sight of the viewer and acquires the gaze distance based on the line of sight.

Images