Wearable video display device

Abstract

To provide a wearable image display device which offers improved light utilization efficiency.SOLUTION: A wearable image display device provided herein comprises a frame body 110A to be worn in front of the eyes of a user HU, a polarizing beam splitter 103A provided inside the frame body at a position to face a front surface of the frame body, and an output display element 101A configured to output linearly polarized image light to the polarizing beam splitter in the frame body, where the polarizing beam splitter is provided at an angle so as to reflect the linearly polarized image light toward the user.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wearable image display device that is worn by a user to observe an image, such as a head mounted display (HMD) or an eyepiece image display device that is fixed to eyeglasses. [Background technology]

[0002] In recent years, the use of virtual reality (VR) has been expanding in various fields, and HMDs and eyepiece-type image display devices are being used (see, for example, Patent Document 1). Eyepiece image display devices are equipped with an optical system that magnifies the display using an eyepiece, and optical see-through (OST) configurations are also known. Optical see-through HMDs are configured to deliver external light from the outside world to the user in addition to light from the display element. The configuration of a conventional optically transmissive HMD is shown in Fig. 7. In an optically transmissive HMD 200A, light emitted from a display element 201A passes through a convex lens 202A and reaches the user HU via a half mirror 203A, reducing the light intensity by half. Furthermore, if it is necessary to maintain a long optical distance between the user HU and the display device, a configuration such as that shown in Fig. 8 can be considered. In this case, an optically transmissive HMD 200B includes a first half mirror 203B and a second half mirror 204B.

[0003] In the optically transmissive HMD 200B, light from the display element 201B passes through the first half mirror 203B twice and the second half mirror 204B once, reducing the light intensity to 1 / 8. Also, a configuration such as that shown in Fig. 9 can be considered, in which the function of the lens in the configuration of Fig. 8 is performed by a concave half mirror. The optically transmissive HMD 200C includes a first half mirror 203C and a second half mirror 204C formed in the shape of a concave mirror, and only 1 / 8 of the light emitted from the display element 201C reaches the user. When used as a standard HMD (which delivers only light from the display element to the user and does not deliver light from the outside world) rather than an optically transmissive HMD, the second half mirrors 204B and 204C used in Figures 8 and 9 are replaced with a flat mirror in the case of Figure 8 and a concave mirror in the case of Figure 9. In the case of a standard HMD, the light passes through the first half mirror 203B or the first half mirror 203C twice, so the available light is reduced to 1 / 4. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-146632 [Non-patent literature]

[0005] [Non-Patent Document 1] https: / / www.phileweb.com / news / d-av / image.php?id=51395&row=5 Summary of the Invention [Problem to be solved by the invention]

[0006] However, wearable image display devices such as the conventional optically transmissive HMDs mentioned above have low efficiency in using light emitted from the display elements, leaving room for improvement in terms of energy conservation. Optically transmissive HMDs, in particular, are often worn on the head and used while moving around over a wide area. For this reason, they are expected to be operated using batteries without external power supply, and reducing power consumption by improving light utilization efficiency will greatly contribute to improving their practicality. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wearable image display device that can improve the efficiency of light utilization. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the wearable image display device according to the present invention includes a frame body that is worn in front of a user's eyes, a polarizing beam splitter that is installed inside the frame body at a position facing the front of the frame body, a half mirror that is installed between the polarizing beam splitter and the front of the frame body, a quarter-wave plate that is installed between the polarizing beam splitter and the half mirror, and an output display element that is installed inside the frame body so as to output image light as linearly polarized light so as to become s-polarized light with respect to the polarizing beam splitter, and the quarter-wave plate The image light is transmitted and converted into circularly polarized light or elliptical polarized light and sent to the half mirror, and the image light from the half mirror is converted into p-polarized light so that it can be transmitted by the polarizing beam splitter and sent, the configuration of the output display element is any of a cross-Nicol type LCD, OLED, plasma display panel, CRT, and micro LED that outputs only linearly polarized components, and a correction unit that corrects the video signal to be output as the video light is provided, the correction unit has a driver and a look-up table, and the color components of the video signal decoded via the driver by referring to a preset look-up table In the preset color The color component value is the center wavelength, and the other two colors are each set to a predetermined value. of light The light is corrected to decrease or increase the loss so that it can be emitted as image light from the output display element.

[0010] According to this configuration, the wearable image display device outputs s-polarized image light from the output display element and reflects it toward the quarter-wave plate at the polarizing beam splitter. The quarter-wave plate then converts the polarization of the image light to either left-handed or right-handed polarized light and sends it to the half mirror. The half mirror reflects half of the transmitted image light and transmits the other half. The image light reflected from the half mirror becomes the other of left-handed or right-handed polarized light, and is converted to p-polarized light via the quarter-wave plate and sent to the polarizing beam splitter. The quarter-wave plate functions to convert the image light into p-polarized image light that transmits through the polarizing beam splitter by passing it twice through the half mirror on a round trip. As a result, the polarizing beam splitter transmits the image light from the quarter-wave plate and sends it to the user. Therefore, there is almost no light loss of the image light other than the light loss caused by the half mirror, and light utilization efficiency is approximately four times higher than that of conventional wearable image display devices. [Effects of the Invention]

[0011] The wearable image display device according to the present invention can improve the light utilization efficiency. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view showing the appearance of a wearable image display device according to a first embodiment. [Figure 2] 1 is a schematic diagram showing the configuration of a wearable image display device according to a first embodiment. [Figure 3] FIG. 10 is a schematic diagram showing the configuration of a wearable image display device according to a second embodiment. [Figure 4] FIG. 10 is a schematic diagram showing the configuration of a wearable image display device according to a third embodiment. [Figure 5] FIG. 10 is a schematic diagram showing the configuration of a wearable image display device according to a fourth embodiment. [Figure 6] FIG. 10 is a schematic diagram showing modified examples of the second to fourth embodiments. [Figure 7] FIG. 1 is a schematic diagram showing the configuration of a conventional wearable image display device. [Figure 8]FIG. 1 is a schematic diagram showing the configuration of a conventional wearable image display device. [Figure 9] FIG. 1 is a schematic diagram showing the configuration of a conventional wearable image display device. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, each embodiment described below is intended to embody the technical concept of the present invention, and unless otherwise specified, the present invention is not limited to the following. Furthermore, the same means are given the same reference numerals, and their explanation may be omitted. Furthermore, in each figure, a "circle" attached to an arrow indicating a light ray indicates s-polarized light with respect to the polarizing beam splitter, and a "triangle" attached to an arrow indicating a light ray indicates p-polarized light.

[0014] First Embodiment As shown in Figures 1 and 2, the wearable image display device 100A is configured to display images wirelessly, for example. The wearable image display device 100A includes a frame body 110A worn by a user HU in front of the eyes, a polarizing beam splitter 103A installed within the frame body 110A at a position facing the front of the frame body 110A, and an output display element 101A within the frame body 110A that outputs image light to the polarizing beam splitter 103A. The wearable image display device 100A also includes a polarizing plate that polarizes the image light in the optical path between the exit surface of the output display element 101A and the reflecting surface of the polarizing beam splitter 103A. The polarizing beam splitter 103A is installed at an angle so as to polarize the image light and reflect it toward the user HU. In this example, the wearable image display device 100A includes a polarizing plate installed on the exit surface of the output display element 101A. Wearable image display device 100A also includes lens 102A in the optical path between output display element 101A and polarizing beam splitter 103A.

[0015] The wearable image display device 100A includes a headband 112A worn on the user's head, headphones 113A that provide sound, a wireless audio and video device such as Bluetooth (registered trademark), a storage means, a computing device, a battery, etc. The wearable image display device 100A also includes a light-transmitting plate 111A on the front of the frame body 110A so that external light can be seen. The wearable image display device 100A receives an encoded signal sent from the main device HS via a wireless device, decodes the video signal from the output display element 101A, and outputs the decoded video signal as video light, displaying the video to the user via an optical system including a polarized beam splitter 103A in the optical path. The decoded audio signal is output from the headphones 113A and transmitted to the user.

[0016] Frame body 110A is a goggle-type housing that is equipped with a device for displaying images, an optical system, etc., and is worn by the user in front of the eyes via headband 112A. Frame body 110A preferably has an elastic material such as rubber or silicone rubber at the portion that comes into contact with the user. Frame body 110A is formed of metal or resin so that components such as the optical system can be supported therein, and a translucent member made of glass or resin that can transmit external light is installed in front of the user's eyes, which are in front of the frame body 110A. Headphones 113A, 113A that transmit sound to the user are installed on both sides of frame body 110A.

[0017] The output display element 101A outputs the image light of the image to be shown to the user. For example, a crossed-Nicols LCD (Liquid Crystal Display) that outputs only linearly polarized light components can be used as the output display element 101A. Here, the output display element 101A is installed in a position that faces the ceiling when the frame body 110A is worn by the user. Of course, the output display element 101A may be installed downward by turning the entire configuration of the wearable image display device 100A upside down, or the entire configuration of the wearable image display device 100A may be rotated 90 degrees and installed on either the left or right side.

[0018] Alternatively, wearable image display device 100A may be divided into two systems, one for the left eye and one for the right eye, with output display element 101A installed in the left and right directions. Output display element 101A outputs image light to polarized beam splitter 103A via lens 102A located below. Output display element 101A is not limited to a crossed Nicol LCD, and its configuration is not limited as long as it can output linearly polarized light.

[0019] Lens 102A is disposed in the optical path from output display element 101A to the user's eyes to widen the user's field of vision with respect to the image. Lens 102A is disposed, for example, immediately behind output display element 101A so as to magnify the image light from output display element 101A. That is, lens 102A is disposed in the optical path between output display element 101A and polarized beam splitter 103A. For example, lens 102A is a convex lens, and in this example, a single lens for the right eye and a single lens for the left eye are disposed in parallel. Lens 102A may be configured by combining multiple lenses as long as it can generate image light that widens the user's field of vision. The lens may be disposed at any location along the optical path, and may be disposed at multiple locations.

[0020] The polarizing beam splitter 103A is installed to reflect the image light (linearly polarized s-polarized light) output from the output display element 101A and send it toward the user HU. Here, because the image light output from the output display element 101A is a linearly polarized s-polarized component, the polarizing beam splitter 103A is configured to reflect almost all of the image light and send it toward the user. The polarizing beam splitter 103A is set to be tilted at an angle of approximately 45 degrees with respect to the display element surface of the output display element 101A. The tilt angle of the polarizing beam splitter 103A is set depending on the installation state of the output display element 101A. In other words, the tilt angle of the polarizing beam splitter 103 is not limited to 45 degrees, and may be any angle that appropriately reflects the image light output from the output display element 101A as an image for the user HU. The polarizing beam splitter 103A can be, for example, a MacNeille type or a wire grid type optical element.

[0021] The light-transmitting plate 111A is intended to allow the user HU to see external light ELT, which is light from outside the wearable image display device 100A. This light-transmitting plate 111A is formed into a plate shape using a transparent or semi-transparent glass or resin material that allows the user to see external light, i.e., external objects. If the light-transmitting plate 111A is made of a glass material, it is desirable to attach a protective film to the plate so that it is less likely to break even if it receives a certain amount of impact. Furthermore, if the light-transmitting plate 111A is made of a resin material, it may be formed by overlapping multiple sheets. The light-transmitting plate 111A also serves the function of preventing dust from entering the frame body 110A.

[0022] The wearable image display device 100A has the above-described configuration and can perform the following operations. To begin with, the wearable image display device 100A is assembled by placing the headband 112A around the head of the user HU and wearing the frame body 110A in front of the eyes. Then, when the power is turned on, a signal is sent from the main device HS to the wearable image display device 100A. Wearable image display device 100A decodes the signal from main device HS and outputs it as image light from output display element 101A. Output display element 101A outputs the image light as linearly polarized light (s-polarized light), for example. The image light output from output display element 101A is sent to polarized beam splitter 103A via lens 102A. Polarized beam splitter 103A reflects the s-polarized image light toward the user. User HU can see the image sent from main device HS using the image light from polarized beam splitter 103A. Note that user HU also sees external light ELT from light-transmitting plate 111A on the front of frame body 110A along with the image.

[0023] Wearable image display device 100A reflects linearly polarized (s-polarized) image light from output display element 101A by polarized beam splitter 103A and sends it to the user HU. As a result, wearable image display device 100A sends almost 100% of the image light output from output display element 101A to the user HU, and the image light is not damaged by polarized beam splitter 103A, which is an optical system in the optical path. This makes it possible to double the light utilization efficiency compared to conventional HMDs configured with an optical system of LEDs and half mirrors.

[0024] Next, second to fourth embodiments will be described with reference to FIGS. 3 to 5. While the components described in the first embodiment were designated with the letter A suffix, the following description will use the letters B, C, D, etc. suffixed to the reference numbers as the embodiment numbers progress, and descriptions of components that have already been described will be omitted where appropriate. Although the light-transmitting plates are not explicitly shown in the frame bodies 110B, 110C, and 110D in FIGS. 3 to 5, the light-transmitting plates may be disposed separately from the half mirrors 105B, 105C, and 105D. Furthermore, the half mirrors 105B, 105C, and 105D in the frame bodies 110B, 110C, and 110D may also function as the light-transmitting plates.

[0025] Second Embodiment A wearable image display device 100B according to the second embodiment will be described with reference to FIG. The wearable image display device 100B includes a frame body 110B that is worn in front of the eyes of a user HU, a polarizing beam splitter 103B that is installed within the frame body 110B in a position facing the front of the frame body 100B, a half mirror 105B that is installed between the polarizing beam splitter 103B and the front of the frame body 110B, a quarter-wave plate 104B that is installed between the polarizing beam splitter 103B and the half mirror 105B, and an output display element 101B that is installed within the frame body 110B so as to output image light as linearly s-polarized light to the polarizing beam splitter 103B. The quarter-wave plate 104B is configured to transmit and polarize the image light from the polarizing beam splitter 103B and send it to the half mirror 105B, and to polarize and send the image light from the half mirror 105B so that it can be transmitted by the polarizing beam splitter 103B. Wearable image display device 100B here has an optical system including output display element 101B, polarizing beam splitter 103B, quarter-wave plate 104B, and half mirror 105B, and here has an optical system including lens 102B in the optical path between output display element 101B and polarizing beam splitter 103B. The configurations of output display element 101B, lens 102B, and polarizing beam splitter 103B have already been described.

[0026] Polarizing beam splitter 103B has the same configuration and function as polarizing beam splitter 103A already described, except for its reflection direction. Polarizing beam splitter 103B reflects the incoming image light onto quarter-wave plate 104 and sends it out. Polarizing beam splitter 103B is installed at an angle so as to reflect the linearly polarized (s-polarized) image light sent from output display element 101B and send it out toward the quarter-wave plate. Polarizing beam splitter 103B also transmits p-polarized image light sent from quarter-wave plate 104 and sends it out to the user.

[0027] The quarter-wave plate 104B is a wave plate that outputs the image light transmitted from the polarizing beam splitter 103B by imparting a phase difference of n / 2 (=λ / 4) between the two perpendicularly polarized components. Here, the quarter-wave plate transmits and outputs the image light reflected from the half mirror 105B installed downstream while imparting a phase difference again, so that the output image light can pass through the polarizing beam splitter 103B. As an example, the quarter-wave plate 104B is formed using the wavelength of G color among RGB colors as a reference wavelength. Here, the quarter-wave plate 104B converts the s-polarized image light transmitted from the polarizing beam splitter 103B into either left-handed or right-handed polarized light and transmits it to the half mirror 105B. The quarter-wave plate 104B converts the image light reflected from the half mirror 105B from either left-handed or right-handed polarized light into linearly p-polarized light, polarizes the light, and sends it to the polarizing beam splitter 103B.

[0028] As mentioned above, the quarter-wave plate 104B is set to have green as its center wavelength. Therefore, it does not function accurately for red, which has a longer wavelength than green, or blue, which has a shorter wavelength than green. Therefore, the image light from the polarizing beam splitter 103B is elliptically polarized rather than completely circularly polarized. Therefore, in the image light from the half mirror 105B, some of the elliptically polarized light does not become p-polarized, and circularly polarized and s-polarized components remain. Therefore, the image light passing through the quarter-wave plate 104B toward the polarizing beam splitter 103B is not completely transmitted, but some components are reflected toward the output display element 101B, preventing it from being reflected to the user. However, the light intensity of the light component toward the output display element 101B is very small compared to the loss of half of the image light by the half mirror 105B, and this does not pose any particular problem in terms of visualizing the image light to the user.

[0029] The half mirror 105B reflects half of the image light that passes through the quarter-wave plate 104B and transmits the other half. As an example, the half mirror 105B also functions as a light-transmitting plate 111B that transmits external light ELT from outside to the user. In other words, the half mirror 105B is arranged so that one flat surface faces the outside in front of the frame body 110B and the other flat surface faces the inside of the frame body 110B. In wearable image display device 100B, when the optical system is configured to lengthen the optical path length, the only place where image light is lost is at the position of half mirror 105B, and there are no other parts of the optical system where image light is significantly lost. Therefore, wearable image display device 100B can achieve four times the light utilization efficiency of a conventional device that uses an optical system of an LCD and half mirror.

[0030] In addition, in the case of an optical system in which the optical path length is realized using a half mirror 105 in the wearable image display device 100B, it is also possible to set in advance a correction unit 120 (see Figure 6) that reduces the loss of the RGB colors of the quarter-wave plate 104B. 6, the correction unit 120 corrects the video signal sent from the main device HS in advance to suppress light loss at the quarter-wave plate 104B. The correction unit 120 corrects the G color component value by a predetermined amount relative to the B color component value so that the RGB colors of the video light match the predetermined color component values, and also corrects the R color component value by a predetermined amount relative to the B color component value.

[0031] Specifically, the correction unit 120 includes a driver and a lookup table. The correction unit 120 corrects the color components of the decoded video signal sent from the main device HS via the driver by referencing a preset lookup table, and adjusts the decoded video signal so that it can be output as video light from the output display element 101B. Because this correction unit 120 can also be used in the third and fourth embodiments described below, it is shown without an alphabetical character after the reference numeral. The common output display element 101 and polarizing beam splitter 103 are illustrated as an optical system, and the optical path of the video light is indicated by a two-dot chain line. By correcting the video signal, the correction unit 120 can easily adjust the proportions of green, red, and blue that reach the user, thereby providing the user with a more realistic image.

[0032] <Third embodiment> Next, a wearable image display device 100C according to a third embodiment will be described with reference to Fig. 4. Wearable image display device 100C does not have lens 102B used in the optical system shown in Fig. 3, and instead has a concave half mirror 105, so that the function of lens 102B is performed by half mirror 105C. The wearable image display device 100C includes an output display element 101C that emits image light, a polarizing beam splitter 103C that reflects the image light from the output display element 101C, a quarter-wave plate 104C that transmits the image light from the polarizing beam splitter 103C and polarizes it as either left-handed or right-handed circularly polarized light, and a half mirror 105C that transmits half of the image light from the quarter-wave plate 104C and reflects the other half. The surface of the half mirror 105C facing the quarter-wave plate 104C is concave. This allows for a wider field of view for the image light transmitted from the half mirror 105C to the user HU via the quarter-wave plate 104C and the polarizing beam splitter 103C. The wearable image display device 100C may also include a correction unit 120 shown in FIG. 6. The configuration and operation of the correction unit 120 are the same as those previously described.

[0033] <Fourth embodiment> As shown in FIG. 5, the wearable image display device 100D according to the fourth embodiment uses a quarter-wave plate 104D that is a concave version of the quarter-wave plate 104C of the wearable image display device 100C according to the third embodiment. That is, in the wearable image display device 100D, the quarter-wave plate 104D and the half mirror 105D are formed with the same concave curvature. Therefore, the wearable image display device 100D is configured so that the quarter-wave plate and the half mirror 105D are concave, thereby fulfilling the role of the lens 102A of the wearable image display device 100A shown in FIG. 2. The wearable image display device 100D may also include a correction unit 120 shown in FIG. 6. The configuration and operation of the correction unit 120 are the same as those already described.

[0034] In the wearable image display device 100C according to the third embodiment and the wearable image display device 100D according to the fourth embodiment, as in the second embodiment, the only parts that lose image light are the half mirrors 105C and 105D, so light utilization efficiency can be improved by approximately four times compared to devices equipped with conventional optical systems. Also, in the wearable image display devices 100C and 100D, one curved surface of the curved half mirrors 105C and 105D may function as a light-transmitting plate installed in front of the frame bodies 110C and 110D, or a separate light-transmitting plate may be provided on the frame bodies 110C and 110D.

[0035] In an optical system using a quarter wave plate, a wavelength other than G (green) may be used as the center wavelength, for example, B (blue) or R (red). When the quarter wave plate is formed with a center wavelength other than G, it is desirable to correct the video signal using the correction unit 120 to adjust it so as to reduce light loss. Furthermore, in all embodiments, the lens 102A for expanding the image display range of the image light is not limited to being located between the output display element and the polarizing beam splitter, as long as it is located in the optical path. For example, it may be located in a position just before the image light passes through the polarizing beam splitter and is sent to the user's eye. An achromatic lens for eliminating chromatic aberration may also be located in the optical path. The achromatic lens may be located adjacent to the lens for expanding the image display range, or may be located in the optical path at a distance.

[0036] Furthermore, although each wearable image display device has been described as being configured to be able to take in light from the outside, it may also be configured as a wearable image display device that covers the front of the frame body so as not to take in external light. Furthermore, the video signal may be a video signal displayed on a 2D screen such as a TV image, or a 3D video signal or a 2D stereoscopic video signal. When using a 3D video signal or a 2D stereoscopic video signal, an optical system suited to the respective video signal must be used, but by using an optical system that sends the video signal from the output display element toward a polarizing beam splitter, it is possible to improve the light utilization efficiency compared to conventional devices.

[0037] As an example, the polarizing beam splitter may function as a polarizing plate. That is, the image light to be output to the polarizing beam splitters 103A-103D may be output from the output display elements 101A-101D as randomly polarized light, and only s-polarized light may be reflected by the polarizing beam splitters 103A-103D. The output display element 101A as a light source can be, for example, an LCD that is configured to use linearly polarized light. Furthermore, the output display elements 101B to 101D can be configured to use, in addition to an LCD, an OLED (Organic Light Emitting Diode), a plasma display panel, a CRT (Cathode Ray Tube), or a micro LED (Micro Light Emitting Diode), which uses natural light. [Explanation of symbols]

[0038] 100, 100A, 100B, 100C, 100D Wearable image display device 101, 101A, 101B, 101C, 101D Output display element 102A, 102B lenses 103, 103A, 103B, 103C, 103D Polarizing Beam Splitters 104B, 104C, 104D 1 / 4 wave plate 105B, 105C, 105D Half mirror 110A, 110B, 110C, 110D frame body 111A Translucent plate 112A Headband 113A Headphones 120 Correction unit

Claims

1. The optical system comprises a frame body that is worn in front of a user's eyes, a polarized beam splitter that is installed within the frame body at a position facing the front of the frame body, a half mirror that is installed between the polarized beam splitter and the front of the frame body, a quarter-wave plate that is installed between the polarized beam splitter and the half mirror, and an output display element that is installed within the frame body so as to output image light as linearly polarized light so that the image light becomes s-polarized with respect to the polarized beam splitter, the quarter-wave plate transmits the image light from the polarizing beam splitter, converts it into circularly polarized light or elliptical polarized light, and sends it to the half mirror; and converts the image light from the half mirror into p-polarized light so that it can be transmitted by the polarizing beam splitter, and sends it; the output display element is configured to be any one of a crossed-Nicol LCD, OLED, plasma display panel, CRT, and micro LED that outputs only linearly polarized components, and includes a correction unit that corrects a video signal to be output as video light; The correction unit is a wearable image display device that includes a driver and a lookup table, and performs correction by referring to a preset lookup table via the driver to adjust the color components of the decoded image signal so that the color component value of a preset color is used as the center wavelength and the other two colors are decreased or increased by preset values ​​so as to reduce light loss, thereby enabling the light to be output as image light from the output display element.

2. 2. The wearable image display device according to claim 1, wherein the half mirror is formed into a concave surface.

3. 2. The wearable image display device according to claim 1, wherein the quarter-wave plate is formed on a concave surface along the concave surface of the half mirror.

4. 4. The wearable image display device according to claim 1, wherein a lens for widening an image range of the image light is disposed in an optical path from the output display element to display the image light to a user.

5. 5. The wearable image display device according to claim 4, further comprising an achromatic lens disposed in the optical path to eliminate chromatic aberration.

6. 6. The wearable image display device according to claim 1, wherein the frame body has a light-transmitting plate that transmits external light, that is, external light, disposed on a front surface of the frame body.

7. 4. The wearable image display device according to claim 1, wherein the quarter-wave plate has a center wavelength in a green wavelength range.

Images