Head-mounted display and adjustment method

Abstract

A head-mounted display (HMD (100)) comprises: a pair of left and right video display units each having a display element and an optical system that causes light from the display element to reach the eyes of a user; an adjustment unit that adjusts positions of the video display units corresponding to the eyes of the user; an adjustment index display unit (signal processing circuit (92)) that causes the display elements to display an annular adjustment index (10) having a predetermined line width; and an operation information output unit (signal processing circuit (92)) that outputs operation information prompting a user to operate the adjustment unit such that the outermost outline of the adjustment index (10) is inscribed in the boundary line of the visual field region of the user by the operation of the adjustment unit and the line width of the annular part becomes uniform.

Description

Head-Mounted Display and Adjustment Method

[0001] The present disclosure relates to a head-mounted display and an adjustment method thereof.

[0002] In recent years, development of so-called head-mounted displays, which are head-mounted display devices, has been actively carried out. For example, Patent Document 1 discloses a head-mounted display capable of presenting (i.e., displaying) a video of content and a video of the outside world. In the head-mounted display disclosed in Patent Document 1, by adjusting the brightness of at least one of the video of content and the video of the outside world, the discomfort given to the user when switching between the video of content and the video of the outside world is reduced.

[0003] Japanese Patent Application Laid-Open No. 2016-090773

[0004] By the way, there is an application in which independent videos are displayed for the left and right eyes of the user in a head-mounted display. At this time, in order to display appropriate videos for the left and right eyes, adjustment of the head-mounted display is necessary, but this adjustment is complicated.

[0005] The present disclosure has been made in view of the above, and an object thereof is to provide a head-mounted display or the like that can be adjusted more easily.

[0006] In order to achieve the above object, in one aspect of the head-mounted display according to the present disclosure, a pair of left and right video display units each having a display element and an optical system that allows light from the display element to reach the user's eyes, an adjustment unit that adjusts the position of the video display unit corresponding to the user's eyes, an adjustment index display unit that causes the display element to display an annular adjustment index having a predetermined line width, and an operation information output unit that outputs operation information for prompting the user to operate the adjustment unit so that the outermost contour of the adjustment index is inscribed in the boundary line of the user's visual field area and the line width of the annular portion becomes uniform.

[0007] Furthermore, in one embodiment of the adjustment method relating to this disclosure, a method for adjusting a head-mounted display comprising a pair of left and right video display units, each having a display element and an optical system for bringing light from the display element to the user's eyes, the method comprising: adjusting the position of the video display unit corresponding to the user's eyes; displaying an annular adjustment indicator having a predetermined line width on the display element; and outputting operation information prompting the user to perform the adjustment step so that the outermost edge of the adjustment indicator is inscribed within the boundary line of the user's field of view and the line width of the annular portion becomes uniform.

[0008] According to this disclosure, a head-mounted display and the like that can be adjusted more easily will be provided.

[0009] Figure 1 is a diagram for outlining the adjustment of the head-mounted display according to the embodiment. Figure 2 is a block diagram showing a part of the functional configuration of the head-mounted display according to the embodiment. Figure 3 is a diagram for explaining an example of the adjustment of the head-mounted display according to the embodiment. Figure 4 is a diagram for explaining an example of the adjustment of the head-mounted display according to the embodiment. Figure 5 is a diagram for explaining an example of the adjustment of the head-mounted display according to the embodiment. Figure 6 is a flowchart showing the adjustment method of the head-mounted display according to the embodiment. Figure 7 is an example of screen display in the adjustment method of the head-mounted display according to the embodiment. Figure 8 is an example of screen display in the adjustment method of the head-mounted display according to the embodiment. Figure 9 is an example of screen display in the adjustment method of the head-mounted display according to the embodiment. Figure 10 is a diagram showing the adjustment process of the head-mounted display according to the embodiment. Figure 11 is a diagram showing the adjustment process of the head-mounted display according to the embodiment. Figure 12 is a diagram showing the operation of the controller in the adjustment of the head-mounted display according to the embodiment. Figure 13 is a diagram showing the adjustment process of the head-mounted display according to the embodiment. Figure 14 is a diagram showing the operation of the controller in the adjustment of the head-mounted display according to the embodiment. Figure 15 is an example of screen display in the adjustment method of the head-mounted display according to the embodiment.

[0010] (Knowledge forming the basis of the disclosure) In recent years, display devices have been developed that, when worn on the user's head, position a display unit in front of the eyes, allowing the displayed image to be viewed on an apparent large screen. Such display devices are called head-mounted displays (HMDs), and they have the characteristic of allowing images to be viewed on an apparent large screen through perspective. In HMDs, since the display unit is positioned in front of the eyes, it is possible to display (allow viewing of) different images to the left and right eyes. Against this backdrop, it becomes easy to include virtually created parallax in images, and as a result, the amount of stereoscopic viewing content such as virtual reality (VR), augmented reality (AR), and mixed reality (MR) is increasing.

[0011] On the other hand, when viewing this content, it is necessary to display images appropriately to both the left and right eyes, so adjusting the position of the user's eyes and the position of the display unit is important. Such adjustments include focus adjustment and interpupillary distance (IPD) adjustment. Focus adjustment involves adjusting the distance between the display element, the optical system, and the user's eye in order to properly form an image on the retina according to the user's visual acuity. IPD adjustment involves adjusting the positions of the display element and the optical system within an intersection plane that intersects the optical axis, so that the optical axis of the display element and the optical system are aligned with the optical axis of the user's lens.

[0012] Traditionally, focus and IPD (interpupillary distance) adjustments were often performed based on whether the image viewed by the user was blurry or not. Moreover, when IPD adjustment was made, the distance between the display element, the optical system, and the user's eye changed, causing the focus to shift and requiring refocusing. Furthermore, if the focus was not adjusted correctly, it was difficult to determine whether the image was blurry or not when attempting IPD adjustment. As a result, it became necessary to repeatedly switch between focus adjustment and IPD adjustment, which was cumbersome.

[0013] Therefore, this disclosure provides an HMD that allows IPD adjustment to be completed even if focus adjustment is not achieved, by separating the determination of focus adjustment completion from the determination of IPD adjustment completion. Here, Figure 1 is a diagram for outlining the adjustment of a head-mounted display according to an embodiment. In Figure 1, a part of the configuration of the HMD 100 is shown in an enlarged view. In this disclosure, as shown in Figure 1, the adjustment indicator 10 displayed by the HMD 100 for IPD adjustment has an annular shape (here, a circle) corresponding to the user's field of view, and its outermost shell has a uniform line width (i.e., a line of thickness up to a certain distance from the boundary line of the user's field of view). The shape corresponding to the user's field of view depends on the optical system used in the HMD, so for example, in addition to a circle, it may be a roughly circular shape including some straight lines such as a semi-circular shape (also called a D-cut), an ellipse, or a polygon such as a rectangle or a pentagon.

[0014] By making the outermost layer have a uniform line width, if IPD adjustment is incomplete, that outermost layer will shift left or right and go outside the user's field of view, making the line width appear thinner by the amount it goes outside the user's field of view. In other words, by looking at the difference in line width, it is possible to determine that it is outside the user's field of view and thus determine that IPD adjustment is incomplete. In this disclosure, the completion of IPD adjustment can be determined by whether or not the line width appears uniform, which is a different judgment criterion from focus adjustment, which is determined by whether or not the image is blurry, so it is possible to complete IPD adjustment even if focus adjustment is incomplete.

[0015] The IPD adjustment is performed in the direction in which the two sets of display elements and optical systems are aligned. Therefore, the adjustment indicator 10 does not need to surround the entire field of view. For example, the adjustment indicator 10 may be an open ring that surrounds both ends in the above-mentioned alignment direction, with the rest being open.

[0016] Furthermore, comprehensive or specific embodiments of this disclosure may be implemented as a system, method, integrated circuit, computer program, or recording medium such as a computer-readable CD-ROM, or as any combination of a system, method, integrated circuit, computer program, and recording medium.

[0017] The embodiments of this disclosure will be described below with reference to the drawings.

[0018] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions of components, connection configurations, steps, and order of steps shown in the following embodiments are examples only and are not intended to limit the scope of the claims. Furthermore, any components in the following embodiments that are not described in an independent claim will be described as optional components.

[0019] Note that the figures are not necessarily strictly accurate. In each figure, substantially identical components are denoted by the same reference numerals, and redundant explanations are omitted or simplified.

[0020] Furthermore, in this specification, terms indicating relationships between elements such as parallel lines, terms indicating the shape of elements such as rectangles, and numerical values ​​and numerical ranges do not represent only strict meanings, but also include substantially equivalent ranges, such as differences of a few percent.

[0021] Furthermore, the HMD in this embodiment has a structure in which many of its components are symmetrical combinations. Therefore, in some configurations, the explanation of one of the left-right combinations may be omitted by referring to the explanation of the other.

[0022] (Embodiment) [Basic Configuration] First, the basic configuration of the HMD in the embodiment will be described with reference to Figure 2. Figure 2 is a block diagram showing a part of the functional configuration of the head-mounted display according to the embodiment.

[0023] The HMD 100 is connected to a power supply 91 and a signal processing circuit 92 via a connector 75 and a plug 75a. The power supply 91 and the signal processing circuit 92 are external devices connected to the HMD 100.

[0024] The power supply 91 is a device that supplies power to the HMD 100 for various operations. The power supply 91 is, for example, an AC-DC converter that converts household AC power and generates DC power of the voltage necessary for the operation of the HMD 100. Alternatively, the power supply 91 may be, for example, a battery that discharges stored power as DC, or a solar cell that supplies power generated using solar energy. The power supply 91 may also be built into the HMD 100 as a battery, or it may be attached to the outside of the HMD 100 as a solar cell. Furthermore, the HMD 100 may be powered by wireless transmission without using the plug 75a and connector 75.

[0025] The signal processing circuit 92 is a device that supplies video information indicating the image to be displayed to the HMD 100 via communication. The signal processing circuit 92 supplies the video information as a digital signal, but it may also be supplied as an analog signal. Alternatively, the video information may be stored in the HMD 100, and the image may be displayed offline when the connection between plug 75a and connector 75 is disconnected. Alternatively, the image information may be generated in real time and supplied to the HMD 100 sequentially for display online while the connection between plug 75a and connector 75 is maintained. Furthermore, such video information may also be supplied using wireless communication.

[0026] The signal processing circuit 92 includes video information of the adjustment indicator 10 and also has the function of displaying the adjustment indicator 10 on the display unit 30. In other words, the signal processing circuit 92 is an example of an adjustment indicator display unit. Furthermore, when displaying the adjustment indicator 10, the signal processing circuit 92 outputs operation information prompting the user to adjust using the adjustment indicator 10, that is, to adjust so that the line width of the outermost outline of the adjustment indicator 10 becomes uniform. In other words, the signal processing circuit 92 is also an example of an operation information output unit. The operation information here may simply refer to a button to switch to the adjustment mode (the display screen of the adjustment indicator 10) (in which case the method of adjustment can be described in the instruction manual, electronic manual, etc.), or it may refer to information that shows the method of adjustment using text, images, etc. Although the signal processing circuit 92 that combines the functions of an adjustment indicator display unit and an operation information output unit is exemplified in this embodiment, the signal processing circuit as an adjustment indicator display unit and the signal processing circuit as an operation information output unit may be provided separately.

[0027] As shown in Figure 2, the video information is transmitted to the drive circuit 38 via the processing unit 38a. The processing unit 38a is a processing unit that processes the video information to be displayed on the display unit 30 of the HMD 100, converts it into an analog signal, and performs various video adjustment processing. The processing unit 38a is realized by a processor, memory, and a program for image processing stored in the memory.

[0028] In this way, the image on the display unit 30 is displayed based on the video information that has reached the drive circuit 38 as an analog signal. Specifically, the display panel 39 is driven by the drive circuit 38, and light representing the image is emitted from each display element. This light is focused by a convex lens 40, which is an example of an optical system, and reaches the user's eye 95, where it is visible to the user. In addition to the convex lens 40, the optical system includes multiple lenses, including concave lenses and planar lenses, as well as optical elements that change the optical path, such as mirrors and half-mirrors. The display unit 30 and the optical system together are sometimes referred to as the video display unit.

[0029] The drive circuit 38 is a circuit device for driving the display panel 39. The display panel 39 is, for example, a liquid crystal panel, an organic EL panel, or a micro-LED panel. In addition to the display unit 30 using such a drive circuit 38 and display panel 39, a retinal projection type laser projector or the like may also be used as the display unit 30.

[0030] Here, two user eyes 95 are shown in the figure; one is the user's right eye and the other is the user's left eye. In the HMD 100, the configuration from the drive circuit 38 onwards is provided in two sets, corresponding to the user's left and right eyes. Also, as shown by the white arrows in the left-right direction of the paper in the figure, the convex lens 40 can be moved in the near-far direction relative to the display unit 30. This movement is performed manually or automatically and contributes to focus adjustment. Also, as shown by the white arrows in the up-down direction of the paper in the figure, the convex lens 40 can be moved in the up-down direction relative to the display unit 30. This movement is performed manually or automatically. One display unit 30 and optical system can be moved in the near-far direction, i.e., in the alignment direction, relative to the other display unit 30 and optical system. This movement is performed manually or automatically and contributes to IPD adjustment. As will be described in detail later, in this embodiment, in order to enable automatic remote adjustment of at least the IPD adjustment by the controller 200, one display unit 30 and optical system can be automatically moved in the alignment direction relative to the other display unit 30 and optical system. Although not shown, the HMD 100 is equipped with a drive device for automatically moving these components. When adjustment is performed manually, the gripping part for manual adjustment corresponds to the adjustment part, and when adjustment is performed automatically, the above-mentioned drive device corresponds to the adjustment part.

[0031] Next, the focus adjustment and IPD adjustment in this embodiment will be explained using Figures 3 to 5. Figures 3 to 5 are diagrams illustrating examples of adjustment of the head-mounted display according to this embodiment. In Figure 3, the left column shows the relationship between the user's field of view (dotted line) after focus adjustment and the adjustment indicator 10, and the right column shows the relationship between the user's field of view before focus adjustment and the adjustment indicator 10. Also in Figure 3, the upper section shows the relationship between the user's field of view after IPD adjustment and the adjustment indicator 10, and the lower section shows the relationship between the user's field of view before focus adjustment and the adjustment indicator 10. Note that only the portion for one eye is shown here.

[0032] As shown in Figure 3, before focusing, the boundary of the adjustment indicator 10 is blurred as indicated by the dot hatching, making it difficult to determine whether IPD adjustment is complete based on whether the image is blurred or not. However, in this embodiment, the adjustment indicator 10 has a shape that has an outermost shell with a uniform line width that is inscribed within the user's field of view, so it is possible to determine whether IPD adjustment is complete by how much it extends beyond the field of view. In other words, whether before or after focusing, if the line width of the outermost shell (in this case, the circular part) is the same on both sides, it can be determined that IPD adjustment is complete, and if it is not the same, it can be determined that IPD adjustment is not complete. In addition, the adjustment indicator 10 includes horizontal and vertical lines that pass through the center of the optical axis of the optical system. These horizontal and vertical lines are not essential, but their presence makes it easier for the user's gaze to converge to the center in the vertical and horizontal directions, thus mitigating the difficulty of adjustment due to gaze drift.

[0033] Furthermore, by including horizontal and vertical lines in the adjustment indicator 10, even if the HMD 100 is mounted tilted in the roll direction as shown in Figure 4, as shown in Figure 5, when the user views the images for both eyes and the images overlap, the horizontal and vertical lines will appear misaligned, thus making the user aware of the tilt of the HMD 100. From the perspective of focusing the user's gaze, instead of such straight lines, a center point that coincides with the center of the optical axis of the optical system could be provided. Using a center point in this way also improves the visibility of the outermost line width.

[0034] [Adjustment Operation] A specific example of the adjustment method for the HMD 100 configured as described above will be explained below with reference to Figures 6 to 15. Figure 6 is a flowchart showing the adjustment method for the head-mounted display according to the embodiment. Figures 7 to 9 and 15 are examples of screen displays in the adjustment method for the head-mounted display according to the embodiment. Figures 10, 11 and 13 show the adjustment process of the head-mounted display according to the embodiment. Figures 12 and 14 show the operation of the controller in the adjustment of the head-mounted display according to the embodiment.

[0035] As shown in Figure 7, first, within the VR space 20 displayed on the HMD 100, the settings application for the HMD 100 (referred to as "VR settings application" in the figure) is launched, and the IPD adjustment function (referred to as "interpupillary distance adjustment" in the figure) is accessed using the controller 200. Next, the "interpupillary distance adjustment" button is selected using the controller 200.

[0036] The signal processing circuit 92 receives this operation, starts IPD adjustment, and outputs operation information prompting the user to operate the adjustment unit (S101). For example, the output of operation information leads to a screen as shown in Figure 8. Here, precautions and adjustment methods for IPD adjustment are displayed as text, and the user can understand how to adjust by reading this text. The controller 200 combines the functions of selection by laser pointer and confirmation by click within the VR space 20, and is a tool for performing UI operations within the VR space 20.

[0037] Next, as shown in Figure 9, when the user selects the "Start" button using the controller 200, the signal processing circuit 92 accepts this operation and displays the adjustment indicator 10 (S102). When the adjustment indicator 10 is displayed on the HMD 100, for example, as shown in Figure 10 or Figure 11, the adjustment indicator 10 is displayed across the entire screen. In Figure 10, the IPD is too close, so it needs to be adjusted to widen the IPD. In Figure 11, the IPD is too wide, so it needs to be adjusted to bring the IPD closer. The HMD 100 starts accepting IPD adjustments from the controller 200 (S103), and the user performs an operation to adjust the IPD (S104).

[0038] For example, as shown by the dashed circle in Figure 12, when a user presses a button on the controller 200 that is assigned to expand or contract the IPD distance, the HMD 100 operates a drive mechanism to automatically expand or contract the IPD distance. By repeating this process, the IPD can be adjusted so that, for example, as shown in Figure 13, the outermost shell of the adjustment indicator 10 appears to have a uniform line width.

[0039] The user inputs that the IPD adjustment operation is complete when the adjustment indicator 10 appears as shown in Figure 13 (S105). For example, the HMD 100 receives the input that the IPD adjustment is complete when the user presses the button assigned to the completion of IPD adjustment on the controller 200, as shown by the dashed circle in Figure 14. This input may be transmitted and received directly from the controller 200 to the HMD 100, or it may be transmitted and received from the controller 200 to the HMD 100 via the signal processing circuit 92. In either case, the HMD 100 is provided with an input unit to receive these transmissions.

[0040] The signal processing circuit 92 receives this operation, outputs operation information, and transitions to a screen similar to that in Figure 8. Then, as shown in Figure 15, when the user selects the "End" button using the controller 200, the signal processing circuit 92 receives this operation and terminates the IPD adjustment function.

[0041] [Effects, etc.] As described above, this disclosure includes the following embodiments of head-mounted displays.

[0042] The head-mounted display (HMD 100) of the first embodiment includes a pair of left and right image display units, each having a display element (a light source element within a display panel 39) and an optical system (such as a convex lens 40) that brings light from the display element to the user's eyes; an adjustment unit (driving device or gripping unit) that adjusts the position of the image display unit corresponding to the user's eyes; an adjustment indicator display unit (signal processing circuit 92) that displays an annular adjustment indicator 10 having a predetermined line width on the display element; and an operation information output unit (signal processing circuit 92) that outputs operation information prompting the user to operate the adjustment unit so that the outermost edge of the adjustment indicator 10 is inscribed within the boundary of the user's field of view and the line width of the annular portion becomes uniform.

[0043] According to this, by having the user determine whether the outermost contour is inscribed in the boundary line of the user's visual field area and whether the line width of the annular part is uniform, it is possible to determine whether the IPD adjustment is completed. Since the focus adjustment is determined to be completed or not depending on whether the image is blurred, it is possible to make the determination of the completion of the focus adjustment independent from the determination of the completion of the IPD adjustment. That is, the advantage is obtained that it is less likely to be necessary to repeatedly go back and forth between the focus adjustment and the IPD adjustment for adjustment. Therefore, adjustment can be made more simply.

[0044] Further, the head-mounted display (HMD100) of the second aspect is the head-mounted display described in the first aspect, and for the adjustment of the position of the image display unit, the adjustment index display unit displays adjustment indices in a time-sharing manner on the display elements corresponding to one eye and the other eye of the user.

[0045] According to this, it is possible to individually adjust the position of the image display unit for one eye and the other eye of the user.

[0046] Further, the head-mounted display (HMD100) of the third aspect is the head-mounted display described in the first or second aspect, and further includes an input unit that receives an input indicating that the operation of the adjustment unit by the user is completed.

[0047] According to this, by receiving the input, it is possible to grasp that the operation of the adjustment unit is completed.

[0048] Further, the head-mounted display (HMD100) of the fourth aspect is the head-mounted display described in the second aspect, and after receiving an input indicating that the adjustment of the position of one eye is completed, the adjustment index display unit displays an adjustment index on the display element corresponding to the other eye.

[0049] According to this, based on receiving an input indicating that the adjustment of the position of one eye is completed, it is possible to start adjusting the position of the image display unit for the other eye.

[0050] Furthermore, the fifth embodiment of the head-mounted display (HMD100) is the head-mounted display according to any one of the first to fourth embodiments, wherein the adjustment indicator further includes at least one of a horizontal line and a vertical line passing through the center of the optical axis of the optical system in the user's field of view.

[0051] According to this, horizontal and vertical lines passing through the center of the optical axis of the optical system within the user's field of view can be used during adjustment. The point where the horizontal and vertical lines intersect is the center of the optical axis of the optical system, and in addition to the effect of making it easier to concentrate the user's gaze at such an intersection point, the degree of misalignment of the horizontal lines of the left and right eyes can also be used by the user to determine whether or not the head-mounted display is being worn correctly.

[0052] Furthermore, the sixth aspect of the adjustment method is an adjustment method for a head-mounted display comprising a pair of left and right video display units, each having a display element and an optical system that brings light from the display element to the user's eyes, and includes the steps of: adjusting the position of the video display unit corresponding to the user's eyes; displaying an annular adjustment indicator having a predetermined line width on the display element; and outputting operation information prompting the user to perform a step of adjusting so that the outermost edge of the adjustment indicator is inscribed within the boundary of the user's field of view and the line width of the annular portion becomes uniform.

[0053] According to this, the head-mounted display can be adjusted by utilizing the effects of the head-mounted display described above.

[0054] Furthermore, the seventh aspect of the adjustment method is the same as the sixth aspect of the adjustment method, wherein after the display step, the user operates the adjustment unit to perform the adjustment step, and after the adjustment step, the user inputs that the adjustment step is complete when the line width of the outermost edge of the adjustment indicator becomes uniform.

[0055] According to this, after the display step, the user performs an adjustment step by operating the adjustment unit, and after the adjustment step, the user inputs that the adjustment step is complete when the outermost line width of the adjustment indicator becomes uniform.

[0056] (Other Embodiments) Although embodiments have been described above, this disclosure is not limited to the embodiments described above.

[0057] For example, the above explanation described performing IPD adjustment simultaneously for both eyes, but it could also be done using time-division multiplexing. For instance, IPD adjustment could be performed for one eye first, and only after that is complete could it be performed for the other eye. In this case, on the operation information screen in Figure 8, the user should be prompted to select the eye to be adjusted first, and only the IPD adjustment corresponding to that eye should be accepted. Then, in step S105, after receiving the input that the IPD adjustment operation is complete, the system should automatically proceed to step S102, where only the IPD adjustment corresponding to the other eye to be adjusted later should be accepted. In other words, steps S101 to S105 should be performed for one eye, and then steps S102 to S105 should be performed for the other eye.

[0058] Furthermore, although the above embodiments illustrate the components that make up the HMD, the functions of each component of the HMD may be distributed in any way among the multiple parts that make up the HMD.

[0059] Furthermore, the method of communication between devices in the above embodiment is not particularly limited. In addition, relay devices (such as broadband routers) not shown may be involved in the communication between devices.

[0060] Furthermore, in the above embodiment, the processing performed by a specific processing unit may be performed by another processing unit. Also, the order of multiple processing units may be changed, or multiple processing units may be executed in parallel.

[0061] Furthermore, in the above embodiment, each component may be realized by executing a software program suitable for each component. Each component may also be realized by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0062] Furthermore, each component may be implemented by hardware. For example, each component may be a circuit (or integrated circuit). These circuits may form a single circuit as a whole, or they may be separate circuits. Also, each of these circuits may be a general-purpose circuit or a dedicated circuit.

[0063] Furthermore, general or specific embodiments of the present invention may be implemented as a system, apparatus, method, integrated circuit, computer program, or recording medium such as a computer-readable CD-ROM. Alternatively, they may be implemented as any combination of a system, apparatus, method, integrated circuit, computer program, and recording medium.

[0064] For example, the present invention may be implemented as a spatial proposal method executed by a computer, such as the spatial proposal system of the above embodiment, or as a program (computer program product) that causes a computer to execute a spatial proposal method. Furthermore, the present invention may be implemented as a computer-readable non-temporary recording medium on which such a program is recorded.

[0065] Furthermore, the present invention also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art could conceive, or forms realized by arbitrarily combining the components and functions of each embodiment without departing from the spirit of the present invention.

[0066] This disclosure is useful as a wearable display device such as a head-mounted display.

[0067] 10 Adjustment indicator 20 VR space 30 Display unit 38 Drive circuit 38a Processing unit 39 Display panel 40 Convex lens 75 Connector 75a Plug 91 Power supply 92 Signal processing circuit 95 Eye 100 HMD 200 Controller

Claims

1. A head-mounted display comprising: a pair of left and right image display units, each having a display element and an optical system for directing light from the display element to the user's eyes; an adjustment unit for adjusting the position of the image display unit corresponding to the user's eyes; an adjustment indicator display unit for displaying an annular adjustment indicator having a predetermined line width on the display element; and an operation information output unit for outputting operation information prompting the user to operate the adjustment unit so that the outermost edge of the adjustment indicator is inscribed within the boundary line of the user's field of view and the line width of the annular portion becomes uniform.

2. The head-mounted display according to claim 1, wherein the position of the image display unit is adjusted by displaying the adjustment indicator on the display elements corresponding to one eye and the other eye of the user in a time-division manner using the adjustment indicator display unit.

3. The head-mounted display according to claim 1, further comprising an input unit for receiving input from the user indicating that the operation of the adjustment unit has been completed.

4. The head-mounted display according to claim 2, wherein, after receiving input that the adjustment of the position of one eye has been completed, the adjustment indicator display unit causes the display element corresponding to the other eye to display the adjustment indicator.

5. The head-mounted display according to any one of claims 1 to 4, further comprising at least one of a horizontal line and a vertical line passing through the center of the optical axis of the optical system in the user's field of view.

6. A method for adjusting a head-mounted display comprising a pair of left and right video display units, each having a display element and an optical system for bringing light from the display element to the user's eyes, the method comprising: adjusting the position of the video display unit corresponding to the user's eyes; displaying an annular adjustment indicator having a predetermined line width on the display element; and outputting operation information prompting the user to perform the adjustment step so that the outermost edge of the adjustment indicator is inscribed within the boundary line of the user's field of view and the line width of the annular portion becomes uniform.

7. The adjustment method according to claim 6, wherein, after the display step, the user operates the adjustment unit to perform the adjustment step, and after the adjustment step, the user inputs that the adjustment step is complete when the line width of the outermost edge of the adjustment indicator becomes uniform.

Images