JP2018132756A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a display device capable of reducing stress caused by distortion of an image when a user observes a virtual image with both eyes in a small size and in a lightweight.SOLUTION: A display device 100 comprises: a micro-display 101; a concave mirror 104; and a stereoscopic renderer 105. The micro-display has a display surface 111 having a width narrower than a pupil interval of a user, and a center position of the display surface is located in an equal distance from the right and left pupils, and the display surface is disposed toward a visual line direction. The concave mirror is disposed at a position where a display image of the micro-display is reflected one time such that the user is allowed to observe a virtual image curved symmetrically right and left. The stereoscopic renderer processes a video signal, and causes the micro-display to display the display image. The stereoscopic renderer converts the video signal into an image such that when the user simultaneously observers the display image of the micro-display with both right and left eyes via the concave mirror, a virtual image of the display image is recognized so as to be displayed on a stereoscopic plane surrounding the user.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a display device that is used by being worn on a user's head.

  Patent Document 1 discloses a visual device in which a light emitting unit of a television is arranged so as to be a blind spot of both eyes, and a television image is focused on both eyes by a concave mirror.

Japanese Patent Laid-Open No. 1-133479

  The present disclosure provides a display device that can reduce stress due to image distortion when a user observes with binocular vision, and can be realized in a small size and light weight.

  The display device according to the present disclosure is a display device that is attached to a user and displays a display image that allows the user to visually recognize a virtual image. The display device includes a micro display, a reflecting mirror, and a three-dimensional renderer. The micro display has a display surface for displaying a display image, the width of the display surface is narrower than the pupil interval of the user, the center of the display surface is at an equidistant position from the left and right eyes, and the display surface is It arrange | positions toward a user's gaze direction. The reflecting mirror is disposed at a position where the display image displayed on the display surface of the micro display is reflected once to allow the user to visually recognize a virtual image curved left-right symmetrically. The stereoscopic renderer processes the input signal and generates a display image displayed on the display surface of the micro display. The stereoscopic renderer generates a display image that allows the user to visually recognize that the virtual image is displayed on a three-dimensional surface surrounding the user when the user visually recognizes the virtual image of the display image via the reflecting mirror. Process the input signal.

  The display device according to the present disclosure is based on the binocular vision of the user without requiring optical means or electrical means for extending the optical path length to remove image distortion or showing independent images to the left and right eyes. The stress can be reduced. For example, it can be realized by a single display and a reflecting mirror, which is small, light and inexpensive.

FIG. 1 is a schematic diagram of a display device according to Embodiment 1. FIG. 2 is an image pattern diagram recognized by the micro display and the left and right eyes in the display device according to the first embodiment. FIG. 3A is a schematic diagram showing a three-dimensional structure recognized by the user in the display device in the first exemplary embodiment. FIG. 3B is a schematic diagram showing a display image of the micro display when the user recognizes the three-dimensional structure shown in FIG. 3A. FIG. 4 is a schematic diagram showing a display image of the micro display in which the display density is changed by processing the video signal. FIG. 5 is a schematic diagram showing a display image of the micro display in which the display density and the luminance are changed by processing the video signal.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
Hereinafter, the first embodiment will be described with reference to FIGS.

[1-1. Constitution]
FIG. 1 is a schematic diagram of a display device according to Embodiment 1. The display device 100 includes a micro display 101, a concave mirror 104, and a solid renderer 105.

  The micro display 101 bisects the line connecting the right pupil 102 and the left pupil 103 of the user into a position slightly ahead of the user's line-of-sight direction so as not to touch the body. The display surface 111 is arranged in the direction of the user's line of sight. Since the width of the micro display 101 is narrower than the distance between the right pupil 102 and the left pupil 103 of the user, that is, the pupil distance, the visual field in front of the user is not obstructed. The width of the micro display 101 is set to a dimension narrower than the pupil distance of a standard adult male, for example. The same applies to other dimensions.

  The concave mirror 104 is disposed at a symmetrical position in front of the user's line-of-sight direction of the micro display 101, and directs the image light emitted from the point a on the micro display 101 with the concave side, which is a reflection surface thereof, facing the user. The light is reflected once and incident on each of the right pupil 102 and the left pupil 103 of the user, and an image (display image) displayed on the micro display 101 is magnified and reflected. The concave mirror 104 is an example of a reflecting mirror.

  Further, the concave mirror 104 is an optical device in which a part of a spheroid whose longitudinal radius of curvature is slightly smaller than that of the lateral direction and whose average longitudinal radius of curvature is in the range of 95 to 150 mm is cut out. Has a reflective surface. That is, it has a continuous single curved surface instead of having independent reflecting surfaces respectively corresponding to the left and right eyes of the user.

  The three-dimensional renderer 105 displays a display image on the display surface 111 of the micro display 101 based on a video signal supplied from the outside. The stereoscopic renderer 105 processes an input video signal so that it can be easily seen when an externally supplied video signal is mapped onto a stereoscopic three-dimensional solid surface. The three-dimensional renderer 105 is configured by a signal processing circuit such as a microcomputer, FPGA, ASIC, or the like. A method of processing the video signal by the stereoscopic renderer 105 will be described later. The video signal is an example of an input signal, and includes display information to be transmitted to the user.

  With the above configuration, the user can recognize the virtual image 106 ahead of the concave mirror 104 in the line-of-sight direction. The display device 100 according to the present embodiment includes, for example, a support member (not shown) that is fixed so that the micro display 101 and the concave mirror 104 are arranged as described above in a state worn by the user. The support member of the display device includes, for example, a headband, a helmet, a hat, a spectacle frame, goggles and the like worn on the user's head. For example, the support member supports the concave mirror 104 symmetrically, and fixes each part so that the center position on the display surface 111 of the micro display 101 and the center position of the reflection surface of the concave mirror 104 face each other.

[1-2. Operation]
In FIG. 1, image light emitted from a point a on the display surface 111 of the micro display 101 is reflected at a point b on the reflection surface of the concave mirror 104 and enters a point c on the right pupil 102 of the user. At the same time, the image light emitted from the point a on the display surface 111 is reflected by the point d on the reflecting surface of the concave mirror 104 and enters the point e of the left pupil 103 of the user. At this time, the user recognizes the virtual image 106 at the intersection point f that extends from the line segment c-b and the line segment ed, that is, the convergence point of binocular vision. Convergence movements of both eyes occur so as to form an image at the center of the retina.

  Since the virtual image 106 generated by the concave mirror 104 is a mirror image, the micro display 101 displays an image that is horizontally reversed in advance.

  FIG. 2 is a diagram illustrating an image that is recognized by the left and right eyes of the user when a square checkerboard pattern is displayed as the display image 200 on the micro display 101. In the configuration of the display device 100 shown in FIG. 1, when the square checkered pattern of the display image 200 shown in FIG. 2A is displayed on the micro display 101, the left eye shown in FIG. Like the image 201, the right eye recognizes a bilaterally symmetrical curved image to the user as in the right eye image 202 shown in FIG. 2C.

  FIGS. 3A and 3B are schematic diagrams illustrating a three-dimensional structure 302 that is virtually recognized by the user when the display image 301 of the micro display 101 is recognized by the left and right eyes, respectively. When images having the same pattern as shown in FIG. 2 are bent symmetrically, if the two images are fused by binocular vision, the user can see the left and right parallaxes even though the microdisplay 101 is flat. Accordingly, a three-dimensional image is recognized in which the central part is a little far and the top and bottom are a little closer. That is, the display information in the display image 301 of the micro display 101 shown in FIG. 3B is recognized as being pasted on the inner surface of the three-dimensional structure 302 surrounding the user as shown in FIG. 3A. Here, the stereoscopic image is a three-dimensional structure 302 as shown in FIG. 3A and is a virtual image curved symmetrically.

  Therefore, the three-dimensional renderer 105 of FIG. 1 can easily recognize that the display image 301 is attached to the inner surface of the three-dimensional structure 302 having such a three-dimensional shape, and the display image 301 has such a three-dimensional shape. If so, the input video signal is processed so that there is no contradiction.

  As an example of processing, if shading is applied to change the brightness so that the central portion of the display image displayed on the display surface 111 is brighter and darker as it goes up and down, it is in harmony with the stereoscopic effect due to parallax. In addition, since the central part of the display image is felt to face the user, the information layout effect can be enhanced by displaying information with higher importance in the central part. In addition, the same effect can be obtained by applying a texture having a texture gradient such as density and blur from the center to the top and bottom.

  FIG. 4 is a schematic diagram showing a display image 401 of the micro display 101 in which the display density is changed by processing the video signal. In the display image 401 shown in FIG. 4, the character (text) displayed in the center has a large vertical size, and the vertical size decreases as it goes up and down. The size of characters in the left-right direction is basically constant. That is, when viewed in the vertical direction, the amount of information per unit area in the central portion is small and the display density is sparse, the amount of information per unit area increases as it goes up and down, and the display density is dense. In this way, by processing the video signal so that the display density in the vertical direction of the display image 401 becomes denser as it goes up and down from the center of the micro display 101, the user views the display image with both eyes. In this case, it becomes easy to recognize as a stereoscopic image. Here, the character (text) is display information included in the video signal.

  FIG. 5 is a schematic diagram showing a display image 501 of the micro display 101 in which the display density and the luminance are changed by processing the video signal. In the display image 501 shown in FIG. 5, the figure (graphic) displayed at the center is large in the vertical direction, and the size in the vertical direction becomes smaller as it goes up and down, and the center of the display image 501 is brightly up and down. The brightness is changed so that it becomes darker as the time elapses. That is, when viewed in the vertical direction, the contrast of the center portion of the display image 501 is high, and the contrast decreases as it goes up and down. In this way, by processing the video signal so that the contrast of the display image 401 decreases as it goes up and down from the center of the micro display 101, the display image is displayed so that it blurs as it goes up and down from the center. Thus, the user can easily recognize the display image as a stereoscopic image when viewing the display image with both eyes. Here, the graphic is the display information included in the video signal.

  Further, the stereoscopic renderer 105 may process the video signal so that the resolution of the central part is high and the resolution of the peripheral part is low, and the definition of the display image changes. For example, it is possible to change the definition of the display image by controlling the display image in units of one pixel of the micro display 101 in the central portion and controlling the display image in units of 4 pixels or 16 pixels in the upper and lower portions. In this way, by processing the video signal, the display image is displayed as blurred as it goes up and down from the central portion, and the user can easily recognize the display image as a stereoscopic image when viewing the display image with both eyes.

  In the above example, an example in which the display density, luminance, and resolution are changed in the vertical direction has been shown. However, the direction in which the video signal is processed may be the horizontal direction, or both the vertical direction and the horizontal direction. May be. That is, by changing the display density, luminance, and resolution from the central part to the peripheral part, the user can easily recognize the display image as a stereoscopic image when viewing the display image with both eyes.

  In addition, when changing only one of the up-down direction or the left-right direction, it is better to change to a direction with a small curvature radius.

[1-3. Effect]
In the display device 100 according to the first embodiment, the display image of the microdisplay 101 displayed on the flat display surface 111 is recognized as if it were a three-dimensional object by the fusion of the user's binocular vision. Furthermore, the display image displayed on the flat display surface 111 is more naturally recognized as a three-dimensional object by processing the video signal in advance by the three-dimensional renderer 105 so as to encourage the display image to be three-dimensionally recognized. be able to. Alternatively, the display information displayed on the flat display surface 111 can be displayed more effectively by three-dimensionally laying out the display information.

  That is, in the display device 100 according to the first embodiment, for example, when the left eye alone or the right eye alone is viewed by closing one eye, the curved image is recognized, but when binocular vision is performed, Since rendering that makes it easy to recognize a display image as a three-dimensional object has been performed, the fusion effect by binocular vision works smoothly, and a virtual three-dimensional image (that is, curved symmetrically by left and right parallax) (Virtual image) is recognized.

  For this reason, the display device 100 according to the first embodiment arranges optical components for optical distortion compensation in order to show an image without distortion in the left and right eyes, or electrically in advance on the left and right respectively. There is no need to use an optical shutter for alternately displaying corrected images.

  Furthermore, in the display device 100 according to the first embodiment, as shown in FIG. 1, when observing the virtual image 106, the line segment cb and the line segment ed that are the optical axes of the left and right eyes are extended. Lines always intersect at point f. Depending on the user, the distance between the left and right pupils varies, but this relationship always holds.

  On the other hand, when the display device 100 is used, if there is a situation where the optical axes of the left and right eyes do not intersect at a single point and spread away, such a thing is possible as long as the object is viewed with the naked eye in daily life. Because it does not happen, the user feels uncomfortable. For this reason, in general, a binocular head-mounted display device does not cause the above-mentioned discomfort even with respect to various left and right pupil intervals. A mechanism, an electric circuit, and a program execution device for adjusting the left and right display positions according to the pupil interval are provided.

  On the other hand, the display device 100 according to the first embodiment does not require such a configuration, and thus can be configured simply, and the display device can be reduced in weight, size, and cost. Can do.

  Furthermore, in the display device 100 according to the first embodiment, the reflecting surface of the concave mirror 104 is configured by a single continuous curved surface, and does not require complicated processing or joining. For this reason, the display device 100 can be applied to a shield for protecting a face that has not been used as a display device conventionally.

(Other embodiments)
As described above, the first embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments that have been changed, replaced, added, omitted, and the like. Moreover, it is also possible to combine each component demonstrated in the said Embodiment 1, and it can also be set as a new embodiment. Therefore, other embodiments will be exemplified below.

  As long as the micro display 101 described in the first embodiment is narrower than the pupil interval and can be disposed between the user's face and the concave mirror 104, the transmissive liquid crystal, the reflective liquid crystal, the LED array, Organic EL, electronic paper, etc. may be sufficient.

  In the first embodiment, it has been described that the video signal supplied from the outside by the stereoscopic renderer 105 is processed in real time. However, even if the video signal subjected to the processing performed in advance by the stereoscopic renderer 105 is directly supplied to the micro display 101. Good.

  In the first embodiment, the micro display 101 bisects the line segment connecting the right pupil 102 and the left pupil 103 of the user so that the user's line-of-sight direction does not touch the body. I explained it to be slightly forward. If the size of the image reflected on the concave mirror 104 is different on the left and right, binocular fusion becomes difficult. Therefore, the micro display 101 is arranged so that the image reflected on the concave mirror 104 is approximately the same size. As long as they are located at the same distance from the pupil 102 and the left pupil 103, they may be located slightly above and below.

  In the first embodiment, the reflection characteristic of the concave mirror 104 may be total reflection or semi-transmissive so that the display image and the outside scene can be observed simultaneously. In the case of semi-transmission, the spectral characteristics of either transmittance or reflectance, or both, may be flat, or may selectively reflect / transmit the required wavelength, or the transmittance or reflectance may vary depending on the location. Either or both may vary.

  In the first embodiment, the reflecting surface of the concave mirror 104 may be the inner surface or the inner surface of the concave mirror 104, which may be the outer surface.

  In addition, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, substitution, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The present disclosure is applied to a head-mounted display device that is used to refer to text information, image information such as drawings and photographs, and video information such as moving images without moving the hand while moving. Is possible.

DESCRIPTION OF SYMBOLS 100 Display apparatus 101 Micro display 102 Right pupil 103 Left pupil 104 Concave mirror 105 Stereo renderer 106 Virtual image 111 Display surface 200 Display image 201 Left eye image 202 Right eye image 301 Display image 302 Three-dimensional structure 401 Display image 501 Display image

Claims (5)

A display device that is worn by a user and displays a display image that allows the user to visually recognize a virtual image,
A display surface for displaying the display image, wherein the width of the display surface is narrower than the pupil interval of the user, and the center of the display surface is at a position equidistant from the left and right pupils of the user, A microdisplay having a surface arranged in the direction of the user's line of sight;
A reflecting mirror disposed at a position that reflects the display image displayed on the display surface of the micro display once to visually recognize the virtual image curved in a left-right symmetry to the user;
A solid renderer that processes an input signal and generates the display image displayed on the display surface of the microdisplay;
The solid renderer allows the user to visually recognize that the virtual image is displayed on a solid surface surrounding the user when the user visually recognizes the virtual image of the display image through the reflecting mirror. A display device that processes the input signal to generate the display image. The reflecting mirror is a concave mirror having a spheroid reflecting surface.
The display device according to claim 1. The stereoscopic renderer processes the input signal and changes the display density of the display image so that the central part is sparse and the peripheral part is dense.
The display device according to claim 1. The stereoscopic renderer processes the input signal and changes the luminance of the display image so that the central part is bright and the peripheral part is dark.
The display device according to claim 1. The stereoscopic renderer processes the input signal and changes the definition of the display image so that the resolution of the central part is high and the resolution of the peripheral part is low.
The display device according to claim 1.

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