JP2015072415A - Display device, head-mounted display device, display device control method, and head-mounted display device control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which allows a user to visually confirm a sound source and a character image representing a voice acquired from the sound source in association.SOLUTION: A transmissive display device comprises: an image display unit which generates image light representing an image, causes the user to visually confirm the image light, and transmits an external scene therethrough; a voice acquisition unit for acquiring the voice; a conversion unit for converting the voice to a character image represented as an image with characters; a specific direction setting unit for setting a specific direction; and a display position setting unit which, on the basis of the specific direction, sets an image display position being a position to visually confirm character image light representing the character image in the visual field of the user.

Description

  The present invention relates to a display device.

  A head-mounted display device (Head Mounted Display, HMD) that is a display device mounted on the head is known. The head-mounted display device, for example, generates image light representing an image using a liquid crystal display and a light source, and guides the generated image light to a user's eye using a projection optical system or a light guide plate This causes the user to visually recognize the virtual image. There are two types of head-mounted display devices: a transmission type in which the user can visually recognize the outside scene in addition to a virtual image, and a non-transmission type in which the user cannot visually recognize the outside scene. The transmissive head-mounted display device includes an optical transmissive type and a video transmissive type.

  In a transmissive head-mounted display device, a technique is known that allows a user to visually recognize a character image representing the sound by converting the sound. For example, Patent Document 1 discloses a technique for allowing a user to visually recognize various sounds acquired by a microphone provided in a head-mounted display device for a hearing impaired person as a character image.

JP 2007-334149 A

  However, in the technique described in Patent Document 1, in the head-mounted display device, although the user can visually recognize the character image representing the voice, the position where the virtual image is formed is used to make the user visually recognize the character image. Since it is fixed in the user's field of view, the character image may interfere with the user's field of view. In addition, there is a problem that the relationship between the sound source and the character image representing the sound acquired from the sound source is not taken into consideration. In addition, there is a problem that it is desired to identify a plurality of types of sound acquired from a plurality of sound sources. The above-described problem is not limited to the head-mounted display device, and is a problem common to display devices.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

(1) According to an aspect of the present invention, a transmissive display device is provided. The display device generates image light representing an image, allows a user to visually recognize the image light, and transmits an outside scene; a sound acquisition unit that acquires sound; and the sound as an image using characters. A conversion unit that converts the character image into a character direction; a specific direction setting unit that sets a specific direction; and a position for visually recognizing the character image light representing the character image in the field of view of the user based on the specific direction. A display position setting unit for setting an image display position. According to the display device of this aspect, based on a specific direction set by the user, the acquired voice can be visually recognized by the user as a character image representing the voice, and the user recognizes the voice. The degree can be improved. Moreover, since the image display position in the user's visual field is set for the character image representing the acquired voice based on the specific direction set by the user, the user can set the specific direction and the character image that are set. Can be visually recognized, the relationship between the set specific direction and the character image can be easily recognized, and the convenience for the user is improved.

(2) In the display device according to the above aspect, the display position setting unit may set the image display position so as not to overlap with a position corresponding to the specific direction in a user's visual field. According to this type of display device, the user can easily recognize the sound source and the character image representing the sound acquired from the sound source in association with each other.

(3) In the display device according to the above aspect, the display position setting unit may set the image display position to a position corresponding to a position other than the center in the user's visual field. According to the display device of this aspect, the user can visually recognize the character image representing the voice while visually recognizing the outside scene at the center of the visual field.

(4) In the display device according to the above aspect, the sound acquisition unit has a different sensitivity for acquiring sound according to a direction from a sound source to the sound acquisition unit; the specific direction is based on the sensitivity of the acquired sound. May be set. According to the display device of this aspect, since the user visually recognizes the character image representing the sound with the loudest volume, even when the user has difficulty in hearing the external sound, the external sound that should be most carefully watched is used. Can be recognized as visual information.

(5) In the display device of the above aspect, the specific direction may be a direction from the sound acquisition unit to a sound source. According to the display device of this aspect, it is possible to make the user visually recognize the sound acquired from the sound source in association with the sound source, and the degree of understanding of the sound acquired by the user is improved.

(6) The display device according to the above aspect includes an image acquisition unit that acquires an image of an outside scene at a plurality of points in time; the image display position setting unit includes a change in the image of the outside scene at a plurality of points in time and the specific direction. The image display position may be set based on the above. According to the display device of this aspect, the sound source direction is recognized by the user in more detail, and the position at which the character image is visually recognized by the user is set near the sound source direction. It is easy to recognize and associate with a character image representing a voice generated by.

(7) The display device according to the above aspect further includes: a distance specifying unit that specifies a distance from the display device to the sound source; and the display position setting unit is configured to detect the character image light based on the specified distance. You may perform at least one of a change of a magnitude | size, the said image display position, and a setting. According to the display device of this embodiment, since at least one of the change in the size of the character image and the setting of the image display position is performed according to the distance from the user to the target sound source, the distance from the user to the target sound source is determined. Can be recognized as visual information.

(8) The display device according to the above aspect further includes a distance specifying unit that specifies a distance from the display device to the sound source; and the conversion unit changes the type of the character image based on the specified distance. May be. According to the display device of this aspect, since the type of the character image to be visually recognized by the user changes according to the distance from the user to the target sound source, the user can recognize the distance to the target sound source as visual information. Can do.

(9) In the display device of the above aspect, the sound acquisition unit has different sensitivity for acquiring sound volume according to a direction from a sound source to the sound acquisition unit; the display position setting unit emits the same different sound source The image display position may be set based on the sound volume acquired differently for each direction. According to the display device of this aspect, even if the outside scene image is not acquired, the sound source direction can be set and the user can visually recognize the character image acquired near the target sound source. improves.

(10) In the display device according to the above aspect, the sound acquisition unit has different sensitivity for acquiring sound in accordance with a direction from a sound source to the sound acquisition unit, and has a maximum sensitivity for acquiring sound from the specific direction. May be set in such a direction. According to the display device of this aspect, the sound source acquisition unit acquires sound from a specific direction with high sensitivity, and it becomes difficult to acquire the sound as it deviates from the specific direction. Accuracy is improved.

(11) The display device according to the above aspect further includes: a voice identification unit that identifies different types of voice acquired from a plurality of sound sources for each type of the voice; and an operation unit that receives an operation by a user; The specific direction setting unit specifies a specific sound source direction that is a direction from the sound acquisition unit to a sound source from which one of the plurality of sounds is acquired based on the operation; and the display position setting The unit may set a position for recognizing the image light representing the one sound in a user's visual field to a position corresponding to the specific sound source direction. According to this form of display device, even in a conversation spoken by a plurality of people, in the user's visual field VR, a character image representing the voice acquired from the specific sound source direction is visually recognized at a position near the specific sound source direction. Therefore, in addition to hearing, the user can visually recognize the specific sound source direction and the character image representing the voice acquired from the specific sound source direction in association with each other, and can easily understand the content of the conversation.

(12) In the display device according to the aspect described above, the display position setting unit is configured to set a position at which the user recognizes the image light representing the one sound in a visual field in a position corresponding to a plurality of the specific sound source directions. You may set to the position which does not overlap in any. According to the display device of this aspect, in the user's visual field VR, all of the character images representing the voices acquired from the plurality of specific sound source directions are visually recognized at positions that do not overlap with the plurality of sound source directions. Can visually recognize the specific sound source direction and the character image representing the sound acquired from the specific sound source direction in further association with each other.

(13) In the display device according to the above aspect, the image display unit generates a plurality of the sounds for the image light different for each type of sound, and gives the user the image light for each of the plurality of sound types. Recognizing as a virtual image; the operation is an operation of specifying the image light corresponding to the sound from one specific sound source direction from the image light for each of the plurality of types of sound recognized in the visual field of the user It may be. According to the display device of this aspect, the user can easily set the specific sound source direction and the character image representing the sound acquired from the specific sound source direction by a simple operation.

(14) In the display device according to the above aspect, the image display unit may cause the user to recognize the image light as a virtual image with a predetermined time delay from the time when the sound acquisition unit acquires the sound. According to the display device of this aspect, when the voice image is temporarily missed and the character image representing the voice is missed, the acquired voice image is recognized by the character image recognized in the user's field of view later than the voice. The user's understanding of the connection before and after is improved.

(15) The display device according to the above aspect further includes: a gaze direction estimation unit that estimates a gaze direction of the user; and the image display unit provides the image light to the user in a state of being mounted on the user's head. The display position setting unit may set the image display position based on a relationship between the specific direction and the line-of-sight direction. According to the display device of this aspect, it is determined whether or not the specific direction is visually recognized in the user's field of view according to the difference between the specific direction and the line-of-sight direction. It is easy to associate and recognize a character image representing

(16) In the display device according to the above aspect, the display position setting unit may determine the specific position in a user's visual field when a specific angle that is an angle formed by the line-of-sight direction and the specific direction is less than a first threshold. The image display position may be set near a position corresponding to the direction, and the image display position may be set regardless of the specific direction when the specific angle is equal to or greater than a first threshold. According to the display device of this embodiment, when a specific direction is visually recognized as an outside scene in the user's field of view, the image display position is set near the specific direction, so that the use for the acquired audio is used. Person's understanding is improved.

(17) The display device according to the above aspect further includes: an image acquisition unit that acquires an image of an outside scene; the image display unit has a second specific angle that is an angle formed by the line-of-sight direction and the specific direction. When the threshold value is greater than or equal to a threshold value, the image acquisition unit generates a specific direction image light that is an image light representing the image in the specific direction and causes the user to recognize it as a virtual image, and the specific angle is less than a second threshold value. In this case, the specific direction image light is not generated; and the display position setting unit sets a position for recognizing the specific direction image light as the image display position when the specific angle is equal to or larger than a second threshold. When not overlapping and set near the image display position, and the specific angle is less than the second threshold, the image display position is set near the position corresponding to the specific direction in the user's field of view. It may be set. According to the display device of this form, in the user's field of view, even if the specific direction is not visually recognized in the outside scene, the image in which the specific direction is captured and the image display position are visually recognized in the vicinity. This improves the user's level of understanding of the voice being played.

(18) In the display device according to the above aspect, the display device further includes: a voice identification unit that identifies the acquired voice and a specific voice different from the acquired voice; the conversion unit includes the acquired voice And the specific voice may be converted into different types of character images. According to the display device of this aspect, the character image representing the acquired sound and the character image representing the sound different from the acquired sound are displayed as different types of character images. Differences in the sound source to be emitted can be recognized visually.

(19) The display device according to the above aspect further includes: a communication unit that acquires an audio signal by communication; and the specific audio may be audio output based on the audio signal acquired by the communication unit. . According to the display device of this aspect, not only the acquired external audio but also the audio representing various audio signals acquired by communication are viewed by the user, and the audio acquired by communication is recognized as visual information. be able to.

(20) According to another aspect of the present invention, a transmissive head-mounted display device is provided. The head-mounted display device generates image light representing an image, and allows the user to visually recognize the image light while being mounted on the user's head, and to transmit an outside scene; audio A voice acquisition unit that acquires the voice; a conversion unit that converts the voice into a character image represented by characters; a gaze direction estimation unit that estimates a user's gaze direction; and a use based on the change in the gaze direction A display position setting unit that sets an image display position that is a position for visually recognizing the character image light representing the character image in the visual field of the person. In this head-mounted display device, the image display position is set at a position that does not hinder the user's field of view in accordance with the user's viewing direction, so that the user's usability is improved.

(21) In the head-mounted display device according to the above aspect, the sound acquisition unit has different sensitivity for acquiring sound volume according to a direction from a sound source to the sound acquisition unit; the display position setting unit is different The image display position may be set based on the sound volume obtained differently for each direction in which the same sound source emits. According to the head-mounted display device of this aspect, the user can visually recognize the character image acquired near the target sound source by setting the sound source direction even if the outside scene image is not acquired. Improved convenience.

(22) In the head-mounted display device of the above aspect, the line-of-sight direction estimation unit includes an angular velocity in the line-of-sight direction and an amount of change in angle with reference to a display state in which the character image light is recognized by a user. The display position setting unit may set the image display position other than the central part in the user's field of view when the specific value exceeds a certain value. According to the head-mounted display device of this aspect, the image display position is set at a position that does not hinder the user's field of view in accordance with the change in the user's viewing direction, so that the user's convenience is improved. .

(23) In the head mounted display device according to the above aspect, the line-of-sight direction estimation unit estimates a gravity direction and a horizontal direction perpendicular to the gravity direction; the display position setting unit includes the gravity direction and the horizontal direction. The image display position in the user's field of view may be set based on the specific value in the display state with respect to the direction. According to this form of the head-mounted display device, the image display position is set at a position that does not hinder the user's field of view in accordance with the change in the user's viewing direction relative to the gravity direction or the horizontal direction. User convenience is improved.

(24) In the head-mounted display device according to the above aspect, the display position setting unit may display the image display position in addition to the central part in the user's visual field when the change amount of the angle is equal to or greater than a third threshold. And the image display position may be set to a preset position in the user's field of view when the amount of change in the angle is less than a third threshold. According to the head-mounted display device of this embodiment, the image display position is set at a position that does not hinder the user's view according to the angle change in the user's viewing direction, so that the user's usability is improved. To do.

(25) In the head-mounted display device according to the above aspect, the display position setting unit is configured to display a center in the user's field of view when a predetermined time has elapsed with the change amount of the angle being less than a fourth threshold. The image display position may be set in a portion, and when the amount of change in the angle is equal to or greater than a fourth threshold, the image display position may be set in a portion other than the central portion in the user's visual field. According to the head-mounted display device of this aspect, when it is determined that the user is paying attention to the character image that is being visually recognized, the image display position is automatically changed to a position that is easy for the user to visually recognize. Therefore, the convenience for the user is improved.

(26) In the head-mounted display device according to the above aspect, the display position setting unit sets the image display position other than the central portion in the user's visual field when the angular velocity is equal to or higher than a fifth threshold. When the angular velocity is less than the fifth threshold, the image display position may be set at a preset position in the user's visual field. According to the head-mounted display device of this embodiment, the image display position is set at a position that does not hinder the user's field of view according to the angular velocity in the user's viewing direction, so that the user's usability is improved. .

(27) In the head-mounted display device according to the above aspect, the display position setting unit is arranged at a central portion in a user's field of view when a predetermined time has elapsed with the angular velocity being less than a sixth threshold. An image display position may be set, and when the angular velocity is equal to or greater than a sixth threshold, the image display position may be set at a position other than the central portion in the user's visual field. According to the head-mounted display device of this aspect, when it is determined that the user is paying attention to the character image that is being visually recognized, the image display position is automatically changed to a position that is easy for the user to visually recognize. Therefore, the convenience for the user is improved.

  A plurality of constituent elements of each embodiment of the present invention described above are not essential, and some or all of the effects described in the present specification are to be solved to solve part or all of the above-described problems. In order to achieve the above, it is possible to appropriately change, delete, replace with another new component, and partially delete the limited contents of some of the plurality of components. In order to solve some or all of the above-described problems or achieve some or all of the effects described in this specification, technical features included in one embodiment of the present invention described above. A part or all of the technical features included in the other aspects of the present invention described above may be combined to form an independent form of the present invention.

  For example, according to one aspect of the present invention, one or more or all of the five elements of the sound acquisition unit, the conversion unit, the image display unit, the specific direction setting unit, and the display position setting unit are included. It can be realized as a device provided. That is, this apparatus may or may not have a voice acquisition unit. Moreover, the apparatus may or may not have the conversion unit. Further, the apparatus may or may not have an image display unit. The device may or may not have the specific direction setting unit. Further, the device may or may not have a display position setting unit. The image display unit may generate image light representing the character image, allow the user to visually recognize the image light, and transmit the outside scene. The sound acquisition unit may acquire sound, for example. For example, the conversion unit may convert the voice into a character image represented as an image. The specific direction setting unit may set a specific direction, for example. For example, the display position setting unit may set an image display position that is a position where the character image light representing the character image in the visual field of the user is visually recognized based on the specific direction. Such a device can be realized as a display device, for example, but can also be realized as a device other than the display device. According to such a form, it is possible to solve at least one of various problems such as improvement in operability of the device, ease of attachment / detachment, integration of the device, and ease of manufacture. Any or all of the technical features of each form of the display device described above can be applied to this device.

  The present invention can also be realized in various forms other than the display device. For example, a head-mounted display device, a display device, a control method for the head-mounted display device, a display system, a head-mounted display system, a display system, and a computer program for realizing the functions of the head-mounted display system It can be realized in the form of a recording medium recording the computer program, a data signal including the computer program and embodied in a carrier wave.

2 is an explanatory diagram showing an external configuration of a head-mounted display device 100. FIG. 3 is a block diagram functionally showing the configuration of the head-mounted display device 100. FIG. It is explanatory drawing which shows the flow of the image display process of an acquisition audio | voice. It is explanatory drawing which shows an example of the visual field VR of a user. It is explanatory drawing which shows an example of the image of the outside scene which the camera 61 imaged. It is explanatory drawing which shows an example of the visual field VR of a user. It is explanatory drawing which shows an example of the visual field VR of a user. It is explanatory drawing which shows the flow of the image display process of the acquisition audio | voice in 2nd Embodiment. It is explanatory drawing showing an example of the visual field VR of a user. It is explanatory drawing which shows an example of the outside scene image BIM which the camera 61 imaged. It is explanatory drawing which shows an example of the visual field VR of a user. It is explanatory drawing which shows an example of the visual field VR of a user. It is explanatory drawing which shows functionally the structure of the head mounted display apparatus 100b in 3rd Embodiment. It is explanatory drawing which shows the flow of the image display process of the acquisition audio | voice in 3rd Embodiment. It is explanatory drawing which shows an example of the visual field VR of a user. It is explanatory drawing which shows an example of the visual field VR of a user. It is explanatory drawing which shows the external appearance structure of the head mounted display apparatus in a modification.

Next, embodiments of the present invention will be described in the following order based on the embodiments.
A. First embodiment:
A-1. Configuration of head mounted display device:
A-2. Acquired sound image display processing:
B1. Second embodiment:
B2. Third embodiment:
C. Variation:

A. First embodiment:
A-1. Configuration of head mounted display device:

  FIG. 1 is an explanatory diagram showing an external configuration of the head-mounted display device 100. The head-mounted display device 100 is a display device mounted on the head, and is also called a head mounted display (HMD). The head-mounted display device 100 of the present embodiment is an optically transmissive head-mounted display device that allows a user to visually recognize a virtual image and at the same time directly view an outside scene. In this specification, a virtual image visually recognized by the user with the head-mounted display device 100 is also referred to as a “display image” for convenience. Moreover, emitting image light generated based on image data is also referred to as “displaying an image”.

  The head-mounted display device 100 includes an image display unit 20 that allows a user to visually recognize a virtual image when mounted on the user's head, and a control unit 10 (controller 10) that controls the image display unit 20. I have.

  The image display unit 20 is a mounting body that is mounted on the user's head, and has a glasses shape in the present embodiment. The image display unit 20 includes a right holding unit 21, a right display driving unit 22, a left holding unit 23, a left display driving unit 24, a right optical image display unit 26, a left optical image display unit 28, and a camera 61. And a microphone 63. The right optical image display unit 26 and the left optical image display unit 28 are arranged so as to be positioned in front of the right and left eyes of the user when the user wears the image display unit 20, respectively. One end of the right optical image display unit 26 and one end of the left optical image display unit 28 are connected to each other at a position corresponding to the eyebrow of the user when the user wears the image display unit 20.

  The right holding unit 21 extends from the end ER which is the other end of the right optical image display unit 26 to a position corresponding to the user's temporal region when the user wears the image display unit 20. It is a member. Similarly, the left holding unit 23 extends from the end EL which is the other end of the left optical image display unit 28 to a position corresponding to the user's temporal region when the user wears the image display unit 20. It is a member provided. The right holding unit 21 and the left holding unit 23 hold the image display unit 20 on the user's head like a temple of glasses.

  The right display drive unit 22 and the left display drive unit 24 are disposed on the side facing the user's head when the user wears the image display unit 20. Hereinafter, the right holding unit 21 and the left holding unit 23 are collectively referred to simply as “holding unit”, and the right display driving unit 22 and the left display driving unit 24 are collectively referred to simply as “display driving unit”. The right optical image display unit 26 and the left optical image display unit 28 are collectively referred to simply as “optical image display unit”.

  The display driving units 22 and 24 include liquid crystal displays 241 and 242 (hereinafter referred to as “LCDs 241 and 242”), projection optical systems 251 and 252 and the like (see FIG. 2). Details of the configuration of the display driving units 22 and 24 will be described later. The optical image display units 26 and 28 as optical members include light guide plates 261 and 262 (see FIG. 2) and a light control plate. The light guide plates 261 and 262 are formed of a light transmissive resin material or the like, and guide the image light output from the display driving units 22 and 24 to the eyes of the user. The light control plate is a thin plate-like optical element, and is arranged so as to cover the front side of the image display unit 20 which is the side opposite to the user's eye side. The light control plate protects the light guide plates 261 and 262 and suppresses damage to the light guide plates 261 and 262 and adhesion of dirt. In addition, by adjusting the light transmittance of the light control plate, it is possible to adjust the amount of external light entering the user's eyes and adjust the ease of visual recognition of the virtual image. The light control plate can be omitted.

  The camera 61 is disposed at a position corresponding to the user's eyebrow when the user wears the image display unit 20. The camera 61 captures an outside scene that is an external scenery in a direction opposite to the user's eye side, and acquires an outside scene image. The camera 61 in the present embodiment is a monocular camera, but may be a stereo camera. The camera 61 corresponds to an image acquisition unit in the claims.

  The microphone 63 is arranged on the opposite side of the right display drive unit 22 in the right holding unit 21. The microphone 63 is a microphone having directivity with different sensitivities for acquiring sound depending on directions. A mechanical structure is formed inside the right holding portion 21 to which the microphone 63 is connected, and the microphone 63 can move relative to the right holding portion 21.

  The image display unit 20 further includes a connection unit 40 for connecting the image display unit 20 to the control unit 10. The connection unit 40 includes a main body cord 48, a right cord 42, a left cord 44, and a connecting member 46 that are connected to the control unit 10. The right cord 42 and the left cord 44 are codes in which the main body cord 48 is branched into two. The right cord 42 is inserted into the casing of the right holding unit 21 from the distal end AP in the extending direction of the right holding unit 21 and connected to the right display driving unit 22. Similarly, the left cord 44 is inserted into the housing of the left holding unit 23 from the distal end AP in the extending direction of the left holding unit 23 and connected to the left display driving unit 24. The connecting member 46 is provided at a branch point between the main body cord 48, the right cord 42 and the left cord 44, and has a jack for connecting the earphone plug 30. A right earphone 32 and a left earphone 34 extend from the earphone plug 30.

  The image display unit 20 and the control unit 10 transmit various signals via the connection unit 40. A connector (not shown) that fits each other is provided at each of the end of the main body cord 48 opposite to the connecting member 46 and the control unit 10. By fitting / releasing the connector of the main body cord 48 and the connector of the control unit 10, the control unit 10 and the image display unit 20 are connected or disconnected. For the right cord 42, the left cord 44, and the main body cord 48, for example, a metal cable or an optical fiber can be adopted.

  The control unit 10 is a device for controlling the head-mounted display device 100. The control unit 10 includes a determination key 11, a lighting unit 12, a display switching key 13, a track pad 14, a luminance switching key 15, a direction key 16, a menu key 17, and a power switch 18. Yes. The determination key 11 detects a pressing operation and outputs a signal for determining the content operated by the control unit 10. The lighting unit 12 notifies the operation state of the head-mounted display device 100 by its light emission state. Examples of the operating state of the head-mounted display device 100 include power ON / OFF. For example, an LED (Light Emitting Diode) is used as the lighting unit 12. The display switching key 13 detects a pressing operation and outputs a signal for switching the display mode of the content video between 3D and 2D, for example. The track pad 14 detects the operation of the user's finger on the operation surface of the track pad 14 and outputs a signal corresponding to the detected content. As the track pad 14, various track pads such as an electrostatic type, a pressure detection type, and an optical type can be adopted. The luminance switching key 15 detects a pressing operation and outputs a signal for increasing or decreasing the luminance of the image display unit 20. The direction key 16 detects a pressing operation on a key corresponding to the up / down / left / right direction, and outputs a signal corresponding to the detected content. The power switch 18 switches the power-on state of the head-mounted display device 100 by detecting a slide operation of the switch.

  FIG. 2 is a block diagram functionally showing the configuration of the head-mounted display device 100. As shown in FIG. 2, the control unit 10 includes a CPU 140, an operation unit 135, an input information acquisition unit 110, a storage unit 120, a power supply 130, an interface 180, a transmission unit 51 (Tx51), and a transmission unit 52. (Tx52). The operation unit 135 receives an operation by the user and includes an enter key 11, a display switch key 13, a track pad 14, a luminance switch key 15, a direction key 16, a menu key 17, and a power switch 18.

  The input information acquisition unit 110 acquires a signal corresponding to an operation input by the user. As a signal corresponding to the operation input, for example, there is an operation input to the track pad 14, the direction key 16, and the power switch 18. The power supply 130 supplies power to each part of the head-mounted display device 100. As the power supply 130, for example, a secondary battery can be used. The storage unit 120 stores various computer programs. The storage unit 120 is configured by a ROM, a RAM, or the like. The CPU 140 reads out and executes the computer program stored in the storage unit 120, thereby operating the operating system 150 (OS150), the image processing unit 160, the display control unit 190, the microphone driving unit 163, the conversion unit 185, and the audio processing unit. 170 functions as a direction determination unit 161.

  The image processing unit 160 acquires an image signal included in the content. The image processing unit 160 separates synchronization signals such as the vertical synchronization signal VSync and the horizontal synchronization signal HSync from the acquired image signal. Further, the image processing unit 160 generates a clock signal PCLK using a PLL (Phase Locked Loop) circuit or the like (not shown) according to the period of the separated vertical synchronization signal VSync and horizontal synchronization signal HSync. The image processing unit 160 converts the analog image signal from which the synchronization signal is separated into a digital image signal using an A / D conversion circuit or the like (not shown). Thereafter, the image processing unit 160 stores the converted digital image signal in the DRAM in the storage unit 120 for each frame as image data Data (RGB data) of the target image. Note that the image processing unit 160 may execute image processing such as various tone correction processing such as resolution conversion processing, brightness and saturation adjustment, and keystone correction processing on the image data as necessary. .

  The image processing unit 160 transmits the generated clock signal PCLK, vertical synchronization signal VSync, horizontal synchronization signal HSync, and image data Data stored in the DRAM in the storage unit 120 via the transmission units 51 and 52, respectively. To do. The image data Data transmitted via the transmission unit 51 is also referred to as “right eye image data”, and the image data Data transmitted via the transmission unit 52 is also referred to as “left eye image data”. The transmission units 51 and 52 function as a transceiver for serial transmission between the control unit 10 and the image display unit 20.

  The display control unit 190 generates control signals for controlling the right display drive unit 22 and the left display drive unit 24. Specifically, the display control unit 190 controls driving of the right LCD 241 by the right LCD control unit 211, driving ON / OFF of the right backlight 221 by the right backlight control unit 201, and left LCD control unit according to control signals. The left LCD 242 driving ON / OFF by 212, the left backlight 222 driving ON / OFF by the left backlight control unit 202, and the like are individually controlled. Thus, the display control unit 190 controls the generation and emission of image light by the right display driving unit 22 and the left display driving unit 24, respectively. For example, the display control unit 190 may cause both the right display driving unit 22 and the left display driving unit 24 to generate image light, generate only one image light, or neither may generate image light.

  The display control unit 190 transmits control signals for the right LCD control unit 211 and the left LCD control unit 212 via the transmission units 51 and 52, respectively. In addition, the display control unit 190 transmits control signals to the right backlight control unit 201 and the left backlight control unit 202, respectively. The microphone driving unit 163 sets the direction of the microphone 63. When the sound source (hereinafter also referred to as “target sound source”) that the user wants to acquire is specified by the operation received by the operation unit 135, the microphone driving unit 163 has the highest sensitivity for acquiring sound from the target sound source. Thus, the direction of the microphone 63 is changed. The microphone drive unit 163 acquires the position and orientation of the image display unit 20 detected by a 9-axis sensor 66 described later. Thus, regardless of the positional relationship between the image display unit 20 and the target sound source, the microphone driving unit 163 always outputs sound from the direction from the microphone 63 to the target sound source (hereinafter also referred to as “sound source direction”). The orientation can be changed to maximize the sensitivity. For this reason, in the head-mounted display device 100 according to the present embodiment, the microphone 63 acquires sound from the sound source direction with high sensitivity, and the sound that becomes difficult to acquire as the position deviates from the sound source direction. Improve image accuracy. The operation unit 135 corresponds to the specific direction setting unit in the claims, and the microphone 63 and the microphone driving unit 163 correspond to the sound acquisition unit in the claims.

  The conversion unit 185 converts the sound acquired by the microphone 63 into a character image in which the sound is represented by characters. The character image is transmitted to the image display unit 20 as a control signal representing the character image by the display control unit 190. The image display unit 20 generates image light representing a character image based on the transmitted control signal and emits it to the user's eyes, so that the user can visually recognize the sound as a character image.

  The direction determination unit 161 determines whether the angle formed by the sound source direction and the user's line-of-sight direction estimated from the orientation of the image display unit 20 detected by the 9-axis sensor 66 described later is equal to or greater than a predetermined threshold. judge. In addition, the direction determination unit 161 determines whether or not the user visually recognizes the target sound source in the outside scene based on the angle formed by the sound source direction and the line-of-sight direction. The angle formed between the specified specific direction and the user's line-of-sight direction corresponds to the specific angle in the claims, and the angle formed between the sound source direction set as an example of the specific direction and the user's line-of-sight direction. Corresponds to a specific angle.

  The audio processing unit 170 acquires an audio signal included in the content, amplifies the acquired audio signal, and a speaker (not shown) in the right earphone 32 and a speaker (not shown) connected to the connecting member 46 ( (Not shown). For example, when the Dolby (registered trademark) system is adopted, processing on the audio signal is performed, and different sounds with different frequencies or the like are output from the right earphone 32 and the left earphone 34, for example. In addition, the voice processing unit 170 extracts a feature from the voice acquired by the microphone 63 and models it, thereby recognizing the voices of a plurality of people separately and identifying a person who speaks for each voice. Recognize. The voice processing unit 170 corresponds to the voice identification unit in the claims.

  The interface 180 is an interface for connecting various external devices OA that are content supply sources to the control unit 10. Examples of the external device OA include a personal computer (PC), a mobile phone terminal, and a game terminal. As the interface 180, for example, a USB interface, a micro USB interface, a memory card interface, or the like can be used.

  The image display unit 20 includes a right display drive unit 22, a left display drive unit 24, a right light guide plate 261 as a right optical image display unit 26, a left light guide plate 262 as a left optical image display unit 28, and a camera 61. And a 9-axis sensor 66 and a microphone 63.

  The 9-axis sensor 66 is a motion sensor that detects acceleration (3 axes), angular velocity (3 axes), and geomagnetism (3 axes). Since the 9-axis sensor 66 is provided in the image display unit 20, when the image display unit 20 is mounted on the user's head, the movement of the user's head is detected. Since the orientation of the image display unit 20 is known from the detected movement of the user's head, the direction determination unit 161 can estimate the user's line-of-sight direction. The direction determination unit 161 and the 9-axis sensor 66 correspond to a gaze direction estimation unit in claims. The microphone 63 transmits the acquired audio signal to the conversion unit 185 and the audio processing unit 170.

  The right display driving unit 22 includes a receiving unit 53 (Rx53), a right backlight control unit 201 (right BL control unit 201) and a right backlight 221 (right BL221) that function as a light source, and a right LCD that functions as a display element. A control unit 211, a right LCD 241 and a right projection optical system 251 are included. The right backlight control unit 201 and the right backlight 221 function as a light source. The right LCD control unit 211 and the right LCD 241 function as display elements. The right backlight control unit 201, the right LCD control unit 211, the right backlight 221 and the right LCD 241 are collectively referred to as “image light generation unit”.

  The receiving unit 53 functions as a receiver for serial transmission between the control unit 10 and the image display unit 20. The right backlight control unit 201 drives the right backlight 221 based on the input control signal. The right backlight 221 is a light emitter such as an LED or electroluminescence (EL). The right LCD control unit 211 drives the right LCD 241 based on the clock signal PCLK, the vertical synchronization signal VSync, the horizontal synchronization signal HSync, and the right eye image data Data1 input through the reception unit 53. . The right LCD 241 is a transmissive liquid crystal panel in which a plurality of pixels are arranged in a matrix.

  The right projection optical system 251 is configured by a collimator lens that converts the image light emitted from the right LCD 241 to light beams in a parallel state. The right light guide plate 261 as the right optical image display unit 26 guides the image light output from the right projection optical system 251 to the right eye RE of the user while reflecting the image light along a predetermined optical path. The right projection optical system 251 and the right light guide plate 261 are collectively referred to as “light guide unit”.

  The left display drive unit 24 has the same configuration as the right display drive unit 22. The left display driving unit 24 includes a receiving unit 54 (Rx54), a left backlight control unit 202 (left BL control unit 202) and a left backlight 222 (left BL202) that function as a light source, and a left LCD that functions as a display element. A control unit 212 and a left LCD 242 and a left projection optical system 252 are included. The left backlight control unit 202 and the left backlight 222 function as a light source. The left LCD control unit 212 and the left LCD 242 function as display elements. The left backlight control unit 202, the left LCD control unit 212, the left backlight 222, and the left LCD 242 are also collectively referred to as “image light generation unit”. The left projection optical system 252 is configured by a collimating lens that converts the image light emitted from the left LCD 242 into a light beam in a parallel state. The left light guide plate 262 as the left optical image display unit 28 guides the image light output from the left projection optical system 252 to the left eye LE of the user while reflecting the image light along a predetermined optical path. The left projection optical system 252 and the left light guide plate 262 are collectively referred to as “light guide unit”.

A-2. Acquired sound image display processing:
FIG. 3 is an explanatory diagram showing the flow of the image display process of acquired sound. FIG. 3 shows a flow of processing for displaying the sound acquired by the microphone 63 on the image display unit 20 as a character image.

  First, the camera 61 captures an outside scene (step S305). FIG. 4 is an explanatory diagram showing an example of the visual field VR of the user. FIG. 4 shows a visual field VR that can be visually recognized by the user and a maximum image display area PN that is an area in which the image display unit 20 can display an image. As shown in FIG. 4, the user can visually recognize the teacher TE, which is the target sound source, and a plurality of students ST listening to the teacher TE's remarks as an outside scene. In addition, the user can visually recognize characters written on the whiteboard WB by the teacher TE. The user can take an image of the outside scene visually recognized by the camera 61 by operating the operation unit 135. Note that the outside scene visually recognized by the user and the outside scene captured by the camera 61 may differ depending on the viewing direction of the user, the orientation of the camera 61, and the like. Therefore, in another embodiment, before the camera 61 captures an outside scene, the image of the captured outside scene is displayed on the maximum image display area PN to be visually recognized by the user, and the user operates the operation unit 135. It is also possible to adopt a mode in which the image of the outside scene imaged in is corrected so as to approach the outside scene visually recognized in the user's visual field VR.

  Next, the user sets the sound source direction (step S310). FIG. 5 is an explanatory diagram illustrating an example of an outside scene image captured by the camera 61. In FIG. 5, when the user specifies the target sound source, an image of the outside scene captured by the camera 61 is displayed over the entire maximum image display area PN, and is within the user's visual field VR and the maximum image display area. In a region other than the PN, a state where the user is viewing the outside scene is shown. When the user wants to specify the target sound source and performs a predetermined operation, the image processing unit 160 performs face recognition on the image displayed in the maximum image display area PN, and uses the teacher TE as a target sound source candidate. Extract. As shown in FIG. 5, when the teacher TE is extracted from the image displayed in the maximum image display area PN, the image display unit 20 displays a rectangular frame MA flashing around the face of the teacher TE. Display in area PN. When the user presses the enter key 11 in this state, the teacher TE is specified as the target sound source, and the sound source direction is set. When the target sound source is specified, the storage unit 120 stores the image within the frame MA in the image displayed in the maximum image display area PN as the image of the target sound source. Therefore, in the head-mounted display device 100 according to the present embodiment, since the specific direction set in the operation unit 135 is the sound source direction, the sound acquired from the sound source is displayed in the maximum image display area PN in association with the sound source. It is possible to improve the understanding level of recognizing the user's voice.

  When the image of the target sound source is stored, the image display unit 20 does not display the image of the outside scene captured in the maximum image display area PN, and the user can visually recognize the teacher TE and the student ST as the outside scene. . The set sound source direction is the absolute direction from the microphone 63 to the target sound source regardless of the orientation of the image display unit 20.

  When the sound source direction is set, the microphone driving unit 163 next sets the direction of the microphone 63 (step S320 in FIG. 3). The microphone driving unit 163 sets the microphone 63 so that the sensitivity at which the microphone 63 acquires sound from the sound source direction is maximized. When the direction is set, the microphone 63 acquires sound (step S330). Next, the conversion unit 185 converts the voice acquired by the microphone 63 into a character image representing the voice (step S340). The image processing unit 160 and the image display unit 20 make the user visually recognize the character image (step S350).

  FIG. 6 is an explanatory diagram showing an example of the visual field VR of the user. In FIG. 6, in addition to the outside scene, the user visually recognizes a text image TX1, a text image TX2, and a text image TX3 (hereinafter also referred to as “text image group”) representing the voice of the teacher TE as a character image. The state is shown. The text image TX1 is a character image that is represented by updating the voice of the teacher TE in real time. The text image TX2 and the text image TX3 are character images representing the voice of the teacher TE a predetermined time before the text image TX1. In the visual field VR, the text image group is displayed at a position not overlapping with the teacher TE existing in the sound source direction and at a position near the teacher TE. Therefore, in the head-mounted display device 100 according to the first embodiment, the text image group that is a character image representing the sound acquired from the target sound source is displayed at a position that does not overlap in the sound source direction. It is easy to recognize the voice of the speaker and the speaker more closely.

  In the present embodiment, the text image TX1 is displayed near the position where the sound source direction is visually recognized in the user's visual field VR. Generally, it is known that the user's visual field VR is about 200 degrees in the horizontal direction and about 125 degrees in the gravity direction at the maximum. In this specification, “near the sound source direction in the user's visual field VR” means that the user's visual angle around the sound source direction is within 60 degrees. More preferably, the text image TX1 is displayed within a viewing angle of 45 degrees of the user centering on the sound source direction.

  Further, the text image TX1 or the like is displayed in a portion other than the central portion in the user's visual field VR. In the present specification, the terms other than the central portion in the user's visual field VR refer to a range excluding 30 degrees or less in the horizontal and vertical directions from the center in the user's visual field VR. Further, it is more preferable that the text image TX1 or the like is displayed in a range excluding within 45 degrees in the horizontal and vertical directions at the center in the visual field VR. The image processing unit 160 and the image display unit 20 correspond to a display position setting unit in claims.

  When a predetermined time elapses, the text image TX1 is displayed as a character image that is one lump without a balloon from the teacher TE, like the text image TX2 and the text image TX3. A character image representing the voice of the teacher TE in one minute is displayed on one character image. Therefore, a new mass text image is created every minute. In the display mode of the text image group shown in FIG. 6, up to three text image clusters are displayed, and when a new text image cluster is created, the oldest text image cluster is displayed from the maximum image display area PN. It will not be done. The storage unit 120 stores the text image group that has been automatically displayed in the maximum image display area PN for each text image group regardless of whether the text image group is displayed or not displayed in the maximum image display area PN. To do. In another embodiment, the lump of one text image does not need to be sound acquired during one minute, and may be, for example, two minutes, or a group of text images is combined. And may be displayed as a lump of one text image.

  Next, it is determined whether or not the user's line-of-sight direction has changed (step S360 in FIG. 3). At the present time in the present embodiment, as shown in FIGS. 4 to 6, the user continues to visually recognize the teacher TE existing in the sound source direction, and the sound source direction and the user's line-of-sight direction are almost the same direction. is there.

  The direction determination unit 161 determines whether the angle formed by the sound source direction and the line-of-sight direction has changed by 30 degrees or more. When it is determined that the user's line-of-sight direction hardly moves and the angle between the user's line-of-sight direction and the sound source direction is less than 30 degrees (step S360: NO), the character image continues to be displayed in the visual field VR. In FIG. 5, the position is not overlapped with the teacher TE and is displayed at a position near the teacher TE other than the center of the maximum image display area PN. When the user's line-of-sight direction moves within a range of less than 30 degrees, the position where the text image group is displayed in the maximum image display area PN is changed according to the angle formed by the sound source direction and the line-of-sight direction. . Note that 30 degrees, which is an angle between the line-of-sight direction and the sound source direction, corresponds to the first threshold value and the second threshold value in the claims. Therefore, in the head-mounted display device 100 according to the present embodiment, when the sound source direction is visually recognized as an outside scene in the user's visual field VR, the text image TX11 or the like is displayed near the sound source direction in the maximum image display area PN. Since it is displayed, the user's understanding of the acquired voice is improved.

  When it is determined that the angle formed by the line-of-sight direction and the sound source direction has changed by 30 degrees or more (step S360: YES), the direction determination unit 161 determines that the target sound source is not visually recognized in the user's visual field VR. To do. In this case, the image processing unit 160 displays the target sound source image captured by the camera 61 in the maximum image display area PN and changes the position where the character image is displayed (step S370).

  FIG. 7 is an explanatory diagram illustrating an example of the visual field VR of the user. FIG. 7 shows a state in which the user's line-of-sight direction changes from the sound source direction downward, and the user is taking notes on the notebook NT using the pen PEN held by the hand HD. As shown in FIG. 7, on the upper side of the maximum image display area PN, a character image is updated and displayed as a text image TX4 in real time. In the maximum image display area PN, an image of the teacher TE that is the target sound source is displayed as an image IMG on the right side of the text image TX4. Unlike the text image group shown in FIG. 6, the text image TX <b> 4 is displayed as a character image that is one lump regardless of the time that has elapsed since the voice was acquired. Further, the text image TX4 is displayed near the image IMG without overlapping the image IMG in the maximum image display area PN. In the present embodiment, the position where the text image TX4 is displayed and the position of the image IMG are set in advance. In other words, when the angle formed by the line-of-sight direction and the sound source direction is 30 degrees or more, the text image TX4 is displayed at a position unrelated to the sound source direction in the maximum image display area PN. Therefore, in the head-mounted display device 100 of the present embodiment, the sound source direction image IMG and the character image are displayed in the maximum image display area PN even if the sound source direction is not visually recognized in the outside scene. The user's level of understanding of the acquired voice is improved.

  Next, it is determined whether or not to end the acquired voice image display processing (step S380 in FIG. 3). If it is determined that the acquired sound image display process is to be performed (step S380: NO), the process from step S330 to step S370 is performed. If it is determined that the acquired sound image display process is to be ended (step S380: YES), the user performs a predetermined operation to end the acquired sound image display process.

  As described above, in the head-mounted display device 100 according to this embodiment, the conversion unit 185 converts the sound acquired by the microphone 63 into a character image. The sound source direction is specified by operating the operation unit 135. The image processing unit 160 and the image display unit 20 set the position of the character image to be displayed in the maximum image display area PN based on the sound source direction. Therefore, in this head-mounted display device 100, based on the direction set by the user, the voice acquired by the user can be visually recognized by the user as a text image TX1 or the like representing the voice. The degree of comprehension of recognizing speech can be improved. Further, since the position for displaying the text image TX1 or the like representing the acquired voice in the maximum image display area PN is set based on the direction set by the user, the user can set the direction and the text image TX1 or the like set. The user's convenience is improved.

  In the head-mounted display device 100 of this embodiment, the 9-axis sensor 66 and the direction determination unit 161 estimate the user's line-of-sight direction based on the orientation of the image display unit 20. The image processing unit 160 and the image display unit 20 set a position for displaying a character image representing the acquired voice in the user's visual field VR based on the difference between the sound source direction and the line-of-sight direction. Therefore, in the head-mounted display device 100 according to the present embodiment, it is determined whether or not the sound source is visually recognized in the user's visual field VR according to the difference between the sound source direction and the line-of-sight direction, and a character image is displayed. Since the position is set, the user can easily recognize the sound source direction and the character image in association with each other.

B1. Second embodiment:
FIG. 8 is an explanatory diagram showing the flow of image display processing of acquired sound in the second embodiment. FIG. 8 shows a flow of processing for distinguishing and displaying character images representing a plurality of different types of sounds. In the head-mounted display device 100a in the second embodiment, a microphone 63a having no directivity acquires different types of sound from a plurality of sound sources instead of the microphone 63 of the first embodiment, and the sound processing unit 170 A plurality of acquired sounds are identified for each type.

  First, the microphone 63a acquires different types of sound from a plurality of sound sources (step S410). The speech processing unit 170 extracts and models speech features from each of the acquired types of speech, and identifies and recognizes speech by type (hereinafter also referred to as “speaker recognition”) (step S420). At this time, the sound processing unit 170 only identifies the type of sound, and the correspondence between the sound source and the sound acquired from the sound source is not specified. Next, the conversion unit 185 converts a plurality of types of sound into character images representing the sound (step S430). The image processing unit 160 transmits the character image as a control signal to the image display unit 20, and the image display unit 20 distinguishes the character image for each type of sound and causes the user to visually recognize it (step S440).

  FIG. 9 is an explanatory diagram illustrating an example of the visual field VR of the user. FIG. 9 shows a state where the user visually recognizes the character image representing the voice of the teacher TE and the character image representing the voice of the student ST1 as different character images in addition to the outside scene. As shown in FIG. 9, in the maximum image display area PN, a text image TX11 that expresses the voice of the teacher TE as a character image on the upper right other than the central portion, and a text that expresses the voice of the student ST1 as a character image below the text image TX11. An image TX12 is shown. The text image TX11 and the text image TX12 are displayed in the maximum image display area PN as character images representing different types of sounds, with the color of the character in the character image being different from the color of the background of the character.

  Next, the camera 61 captures an outside scene (step S445 in FIG. 8). The process for the camera 61 to pick up an outside scene is the same as the process shown in step 305 of FIG. 3 in the first embodiment, and a description thereof will be omitted.

  Next, the user operates the operation unit 135 to select one sound source from the captured image displayed in the maximum image display area PN, thereby allowing a plurality of sound sources from the microphone 63a to the plurality of sound sources. One sound source direction is specified from the directions (step S450). FIG. 10 is an explanatory diagram illustrating an example of an outside scene image BIM captured by the camera 61. In FIG. 10, the outside scene image BIM captured by the camera 61 is displayed in the maximum image display area PN. In the outside scene image BIM, the text image TX11 and the text image TX12, the cursor CR, and the instruction image CM shown in FIG. 9 are displayed. The instruction image CM is an image indicating an instruction for the next operation performed by the user. The cursor CR is an image that moves on the maximum image display area PN when the user operates the direction key 16. In accordance with the instruction “Specify sound source” displayed on the instruction image CM, the user moves the cursor CR so as to overlap the teacher TE, which is the target sound source displayed in the maximum image display area PN. When the key 11 is pressed, one target sound source is selected and the sound source direction is specified.

  Next, the character image representing the sound acquired from the selected target sound source is selected (step S460 in FIG. 8). When one target sound source is selected, the character displayed in the instruction image CM is changed to “Please select a character image acquired from the selected sound source”. When the user selects the text image TX11 as a character image representing the voice of the teacher TE, the voice processing unit 170 recognizes that the type of voice represented as the text image TX11 is the voice of the teacher TE.

  Next, the control unit 10 determines whether the same number of sound source directions as the number of types of sound have been specified (step S470). At this time, since the sound source direction corresponding to the text image TX12 has not been set (step S470: NO), the processes of steps S450 and S460 are performed. When the user selects the student ST1 as the target sound source (step S450) and selects the text image TX12 as the character image representing the voice of the student ST1 (step S460), the voice processing unit 170 is represented as the text image TX12. A certain kind of voice is recognized as the voice of the student ST1. Therefore, in the head-mounted display device 100a according to the second embodiment, a specific sound source direction and a character image representing voice acquired from the specific sound source direction are set by a simple operation, and the user can easily speak. Person recognition can be set.

  If the user specifies the same number of sound source directions as the number of types of speech (step S470: YES), it is next determined whether or not the correspondence between the specified sound source direction and the character image is correct. (Step S475). If it is determined that the correspondence relationship is not correct (step S475: NO), the processing from step S450 to step S470 is performed again for the combination of the sound source direction and the character image determined to have the incorrect correspondence relationship. Is done.

  When it is determined that the same number of sound source directions as the number of types of audio have been specified (step S475: YES), the image processing unit 160 and the image display unit 20 display the instruction image CM and the cursor in the maximum image display area PN. The method of displaying the text image TX11 and the text image TX12 and the position thereof are changed while the CR is not displayed (step S480).

  FIG. 11 is an explanatory diagram illustrating an example of the visual field VR of the user. In FIG. 11, a specified sound source direction and a character image representing a sound acquired from the specified sound source direction are displayed in association with each other. As illustrated in FIG. 11, the text image TX11 is a character image representing the voice of the teacher TE, and thus is a character image surrounded by a balloon starting from the teacher TE. Further, since the text image TX12 is a character image representing the voice of the student ST1, it is a character image surrounded by a balloon starting from the student ST1. In each of the text image TX11 and the text image TX12, a character image representing a voice acquired from each of the teacher TE and the student ST1 is updated and displayed in real time. The number of characters displayed in the text image TX11 and the text image TX12 is determined in advance. When the number of characters exceeds the predetermined number, the excess characters are not displayed. In other embodiments, the display and non-display of characters may be performed not by the number of characters but by time or the like. Further, when a predetermined time elapses without acquiring the same type of sound from the last sound acquired from the sound source direction, the character image is not displayed in the maximum image display area PN. In the present embodiment, the character image is not displayed when 5 minutes as the predetermined time elapses. However, in another embodiment, the predetermined time may be a time other than 5 minutes.

  Next, the user determines whether or not to end the acquired voice image display process (step S490 in FIG. 8). Since the determination in step S490 is the same as the determination in step 380 of FIG. 3 of the first embodiment, the description thereof is omitted.

  As described above, in the head-mounted display device 100a according to the second embodiment, the sound processing unit 170 identifies a plurality of acquired sounds for each type. The operation unit 135 specifies a direction from the microphone 63a to a sound source from which a specific sound is acquired from among a plurality of types of sound acquired by the microphone 63a by receiving an operation by the user. The image processing unit 160 and the image display unit 20 represent the positions where the text image TX11 and the text image TX12 are displayed in the maximum image display region PN in the user's visual field VR as the text image TX11 and the text image TX12, respectively. Set near the sound source direction from which the sound to be acquired is acquired. In addition, the image processing unit 160 and the image display unit 20 indicate the positions at which the text image TX11 and the text image TX12 are displayed in the maximum image display area PN in any of a plurality of sound source directions in the user's visual field VR. Are also set to positions that do not overlap. Therefore, in the head-mounted display device 100a according to the second embodiment, a character image representing the voice of a speaker is located near the speaker in the maximum image display area PN even in a conversation where a plurality of people speak. Is displayed. Therefore, the user can visually recognize the speaker and the character image representing the voice of the speaker in addition to hearing, and can easily understand the content of the conversation. In addition, since all of the character images representing the acquired voice are displayed at positions that do not overlap with the plurality of sound source directions, the user visually recognizes the speaker and the character image representing the voice of the speaker more closely. be able to.

B2. Third embodiment:
FIG. 13 is an explanatory diagram functionally showing the configuration of the head-mounted display device 100b according to the third embodiment. In the head-mounted display device 100b according to the third embodiment, the control unit 10b includes the wireless communication unit 132 and the CPU 140b of the control unit 10b performs image determination as compared with the head-mounted display device 100 according to the above-described embodiment. It differs from functioning as the part 142. In the third embodiment, the audio processing unit 170b acquires an audio signal acquired by the wireless communication unit 132 that is different from the audio acquired by the microphone 63, and uses the audio signal as audio, and the speakers of the earphones 32 and 34. Supply against.

  The wireless communication unit 132 performs wireless communication with other devices in accordance with a predetermined wireless communication standard such as a wireless LAN or bluetooth (registered trademark). The wireless communication unit 132 acquires a sound signal representing a sound different from the sound acquired by the microphone 63 by performing wireless communication. Examples of the audio signal acquired by the wireless communication unit 132 include an audio signal broadcast from a radio or the like, and an audio signal acquired and digitized by a microphone different from the microphone 63 of the head-mounted display device 100b. included. The image processing unit 160 extracts a target included in an outside scene image (moving image) continuously captured by the camera 61 as a target sound source candidate by face recognition. The image determination unit 142 determines, by pattern matching, a change in the movement of the specific object that is the same as the image data of the specific object stored in advance in the storage unit 120 with respect to the extracted target sound source candidate. For example, when the teacher TE is extracted as a candidate for the target sound source, the image determination unit 142 performs pattern matching on the mouth portion that is a part of the teacher TE's body, and the opening / closing state of the teacher TE's mouth Determine. The wireless communication unit 132 corresponds to the communication unit in the claims. The outside scene image (moving image) continuously captured by the camera 61 corresponds to an outside scene image at a plurality of times acquired by the image acquisition unit in the claims. The user can visually recognize the outside scene transmitted through the light guide plates 261 and 262 of the image display unit 20 and the display image displayed in the maximum image display area PN separately from the outside scene image captured by the camera 61.

  FIG. 14 is an explanatory diagram illustrating a flow of an acquired sound image display process according to the third embodiment. In the acquired voice image display process according to the third embodiment, the sound source direction is set by detecting the opening / closing state of the mouth of the teacher TE, and the voice different from the voice acquired by the camera 61 is converted as a different type of character image. This is different from the acquired sound image display processing of the first embodiment.

  In the acquired sound image display processing in the third embodiment, when an outside scene is first imaged by the camera 61 (step S505), the image processing unit 160 extracts a teacher TE as a target sound source candidate (step S506). . FIG. 15 is an explanatory diagram illustrating an example of the visual field VR of the user. As illustrated in FIG. 15, when the teacher TE is extracted as a target sound source candidate, the image determination unit 142 then further performs a pattern matching on the peripheral portion MO of the teacher TE's mouth (hereinafter simply “mouth MO”). Is also determined, and it is determined whether or not there is a change in the opening / closing state of the mouth MO (step S507 in FIG. 14). If it is determined that there is no change in the opening / closing state of the mouth MO of the teacher TE (step S507: NO), the image determination unit 142 continues to extract the opening / closing state of the mouth MO while extracting the mouth MO of the teacher TE. The detection of the change is monitored (step S507). If it is determined that the opening / closing state of the mouth MO of the teacher TE has changed (step S507: YES), the storage unit 120 sets the mouth MO of the teacher TE as the target sound source even if the operation unit 135 is not operated. The sound source direction is stored and set (step S510).

  When the sound source direction is set, the microphone driving unit 163 sets the direction of the microphone 63 (step S520), and the microphone 63 and the wireless communication unit 132 acquire voice and a voice signal representing the voice (step S530). In 3rd Embodiment, the radio | wireless communication part 132 acquires the audio | voice signal of the internet radio acquired by communication. Next, the conversion unit 185 converts the voice acquired by the microphone 63 and the voice signal acquired by the wireless communication unit 132 into character images of different types of fonts (step S540).

  When the voice and the voice signal are converted into a character image, the image processing unit 160 and the image display unit 20 cause the user to visually recognize different types of converted character images (step S550). FIG. 16 is an explanatory diagram illustrating an example of the visual field VR of the user. As shown in FIG. 16, in the maximum image display area PN, the sound acquired by the microphone 63 is displayed as the text image TX41, and the sound signal acquired by the wireless communication unit 132 is displayed as the text image TX42. The font of the text image TX41 is MS Gothic, and the font of the text image TX42 is MS Mincho. In other embodiments, the maximum image display area PN may display a text image TX41 or the like using different fonts, or may include elements other than fonts that form a character image, such as bold and thin characters, and the size of characters. It may be changed and displayed.

  When the user visually recognizes the character image (step S550 in FIG. 14), the image determination unit 142 monitors the change in the position of the target sound source in the outside scene image (step S560). Since the camera 61 continuously captures the outside scene image, the image determination unit 142 can specify the position of the mouth of the teacher TE that is the target sound source in the outside scene image at a plurality of points in time. If it is determined that the position of the mouth of the teacher TE in the outside scene image has changed (step S560: YES), for example, the position of the mouth MO of the teacher TE is changed from the position in the field of view VR shown in FIG. 16 to the field of view VR shown in FIG. When the position is changed to the position, the image processing unit 160 and the image display unit 20 change the position where the character image is displayed in the maximum image display area PN (step S570 in FIG. 14). The image processing unit 160 and the image display unit 20 display character image light near the mouth MO of the teacher TE whose position has changed in the maximum image display region PN. If the display position of the character image light is changed (step S570), or if it is determined in step S560 that the position of the target sound source of the outside scene image has not changed (step S560: NO), an image of the acquired voice It is determined whether or not to end the display process (step S580).

  As described above, in the head-mounted display device 100b according to the third embodiment, the camera 61 continuously captures an outside scene image, and the image processing unit 160 and the image display unit 20 use the mouth of the teacher TE in the outside scene image. If it is determined that the position of the MO has changed, the position where the character image is displayed in the maximum image display area PN is changed. Therefore, in the head-mounted display device 100b according to the third embodiment, the sound source direction is recognized in more detail by the user, and the position where the character image is displayed is set near the sound source direction. The direction and the character image representing the sound emitted from the target sound source can be easily associated with each other and recognized.

  In the head-mounted display device 100b according to the third embodiment, the audio processing unit 170b acquires an audio signal acquired by the wireless communication unit 132 different from the audio acquired by the microphone 63. The conversion unit 185 converts the voice acquired by the microphone 63 and the voice signal acquired by the wireless communication unit 132 into character images of different types of fonts. Therefore, in the head-mounted display device 100b according to the third embodiment, the text image TX41 representing the voice acquired by the microphone 63 and the text image TX42 representing the voice acquired by other than the microphone 63 are different types of character images. Therefore, it is possible to make the user visually recognize the difference between sound sources that emit sound. In the head-mounted display device 100b, the sound different from the sound acquired by the microphone 63 is a sound representing an audio signal acquired by communication by the wireless communication unit 132. Therefore, in the head-mounted display device 100b, the user listens not only to the external sound acquired by the microphone 63 but also to the sound representing various audio signals acquired by communication, and the sound acquired by communication. Can be recognized as visual information.

C. Variation:
In addition, this invention is not limited to the said embodiment, It can implement in a various aspect in the range which does not deviate from the summary, For example, the following deformation | transformation is also possible.

C1. Modification 1:
In the above embodiment, in the head-mounted display device 100, the voice obtained by the conversion unit 185 is converted into a character image in real time so that the user can visually recognize the character image. The method of visually recognizing is not limited to this, and various modifications are possible.

  FIG. 12 is an explanatory diagram illustrating an example of the visual field VR of the user. In FIG. 12, the voice stored in the storage unit 120 is distinguished for each type and displayed as a character image representing the voice in the maximum image display area PN in association with the time when the voice was recorded. As shown in FIG. 12, an elapsed time TM from the start of voice recording is displayed on the left side of the maximum image display area PN. On the right side of the elapsed time TM in the maximum image display area PN, a text image TX35, which is a plurality of character images, is displayed. The text image TX35 or the like is displayed in association with the recorded time indicated by the elapsed time TM. For example, the text image TX35 is a character image representing the voice that has started to be recorded at the start of recording when the voice is started to be converted into a character image, and it can be seen from the characters in the text image TX35 that the sound source is the teacher TE. In addition, the text image TX32 is a character image representing the sound that has been recorded when approximately 32 minutes have elapsed since the recording was started, and it can be seen from the characters in the text image TX32 that the sound source is the student ST1. .

  When the cursor CR shown in FIG. 12 is selected by being superimposed on the text image TX35 or the like, the character image displayed as the text image TX35 is enlarged and displayed over the entire maximum image display area PN. In addition, an image of the sound source direction is displayed together with the character image by an operation from the user. Therefore, in the head-mounted display device 100, the user can later confirm the character image representing the voice stored in the storage unit 120 even when the user misses the voice or misses the character image. In addition, the storage unit 120 also stores the correspondence between the sound source direction image and the recorded time, which is convenient when searching for a character image representing the voice recorded by the user in the past. Will improve.

  In addition, when the user is listening to a voice, a predetermined operation is performed on the operation unit 135 so that the voice acquired while the predetermined operation is received may be displayed as a special character image. However, it may be stored in the storage unit 120 as a special voice. In the head-mounted display device 100, a character image is characterized and displayed in the maximum image display area PN or a voice is characterized and stored by a user operation. Therefore, since the user can add new information for each voice and character image, the convenience for the user is improved.

  Further, the image display unit 20 may cause the user to visually recognize the character image with a predetermined time delay from the time when the sound is acquired. For example, the image display unit 20 may display the acquired sound in the maximum image display area PN with a delay of 30 seconds. In the head-mounted display device 100, when the user temporarily misses the voice and misses the character image representing the real-time voice, the character image displayed later than the voice is displayed at the present time. It can be visually recognized as a character image representing the voice missed 30 seconds before the voice being heard. Therefore, the user can easily understand the connection before and after the acquired voice.

C2. Modification 2:
In the above embodiment, the position of the character image to be displayed is set in the maximum image display area PN due to the deviation between the estimated user's line-of-sight direction and the sound source direction. The method is not limited to this, and various modifications are possible. For example, the position and method of the character image displayed in the maximum image display area PN may be set based only on the estimated user's line-of-sight direction.

  The direction determination unit 161 and the 9-axis sensor 66 detect the movement of the image display unit 20, and the line of sight is based on the display state in which the character image representing the acquired voice is displayed in the maximum image display region PN. At least one of the change amount of the direction angle and the angular velocity is estimated. Note that the amount of change in the angle in the line-of-sight direction and the angular velocity correspond to specific values in the claims. In addition, since the 9-axis sensor 66 can detect geomagnetism, the 9-axis sensor 66 specifies the gravity direction and the horizontal direction perpendicular to the gravity direction. The direction determination unit 161 and the 9-axis sensor 66 have the gravity direction and the horizontal direction. It is possible to estimate the amount of change in angle and the angular velocity with respect to. In the head-mounted display device 100 of this modification, when the angle of the line-of-sight direction changes by 30 degrees or more, or when the angular velocity is 1 (radian / second) or more, the direction determination unit 161 is It is determined that the user wants to view the outside scene instead of the character image displayed in the maximum image display area PN. In this case, the image processing unit 160 and the image display unit 20 change the position where the character image is displayed in the opposite direction in which the user's line of sight moves in the maximum image display area PN except for the central portion. For example, when the user's line-of-sight direction is directed upward with respect to the direction of gravity, the user can estimate that he / she wants to view the upper outside scene, so that a character image is displayed on the lower side in the maximum image display area PN. . Therefore, in the head-mounted display device 100 according to this modification, the position for automatically displaying the character image is changed to a position that does not hinder the user's view according to the direction that the user wants to view. User convenience is improved. Note that 30 degrees corresponds to the third threshold value in the claims, and 1 (radian / second) corresponds to the fifth threshold value in the claims. In another embodiment, the threshold value may be a numerical value other than 30 degrees, and the angular velocity may be a numerical value other than 1 (radian / second).

  Further, in the head-mounted display device 100 of this modified example, with respect to the display state, the amount of change in the angle of the line of sight is less than 30 degrees, and the angular velocity in the line of sight is less than 1 (radians / second), If 30 seconds have elapsed in this state, the direction determination unit 161 determines that the user is paying attention to the character image displayed in the maximum image display area PN. In this case, the image processing unit 160 and the image display unit 20 display a character image at the central portion in the maximum image display area PN. Therefore, in the head-mounted display device 100 according to this modification, when it is determined that the user is paying attention to the character image, the character image is automatically displayed at a position that is easy for the user to visually recognize. User convenience is improved. Note that 30 degrees corresponds to the fourth threshold value in the claims, and 1 (radian / second) corresponds to the sixth threshold value in the claims.

C3. Modification 3:
In the above embodiment, the sound source direction in which the target sound source exists is set as the specific direction. However, the sound source direction does not necessarily have to be a specific direction, and the set specific direction can be variously modified. For example, when a bus guide that is a sound source is explaining a landmark such as a sky tree, the direction of the sky tree that is visible not in the sound source but in the user's visual field VR is set as a specific direction. Good. In this case, the user can visually recognize the character image while visually recognizing the sky tree in a specific direction different from the sound source. In the head-mounted display device 100 according to this modified example, a user can freely set a specific direction that the user wants to visually recognize, which improves user convenience.

  Further, the specific direction may be a line-of-sight direction visually recognized by the user, a backward direction of the user, or a traveling direction of the vehicle. For example, if the specific direction is behind the user, the character image displayed is changed so that the user recognizes the character image representing the voice acquired in the backward direction. May be.

  In the above embodiment, the voice acquired from a human is an example of a voice. However, the voice acquired and converted is not limited to this, and can be variously modified. It may be a warning sound such as a siren or a sound effect. For example, when the user is surrounded by many people and listening to the voices of many people, the voice processing unit 170 identifies only the warning sound and visually recognizes the character image representing the warning sound. By doing so, the user can be alerted promptly, and the convenience for the user is improved.

  In the above embodiment, the user's line-of-sight direction is estimated by the nine-axis sensor 66 provided in the image display unit 20, but the method of estimating the user's line-of-sight direction is not limited to this, and various modifications can be made. . For example, the line of sight of the user may be estimated by capturing the eyes of the user with a CCD camera and analyzing the captured image.

  In the above embodiment, the character image is displayed at a position near the sound source direction in the maximum image display area PN and displayed in a portion other than the central portion. However, the position and method of displaying the character image are as follows. The present invention is not limited to this, and various modifications are possible. For example, if the character image is more important than the outside scene visually recognized by the user, the character image may be displayed in the central portion of the maximum image display area PN. Further, in the user's visual field VR, when the target sound source is visually recognized at the corner and it is desired to display as many characters as possible in the maximum image display area PN, the maximum sound display area PN that does not overlap the sound source direction is displayed. A character image may be displayed in the entire area. Further, in order to improve the visibility of the outside scene in the user's visual field VR, the sound source direction and the character image may be displayed in an overlapping manner.

C4. Modification 4:
In the above-described embodiment, the microphone 63 moves relative to the image display unit 20 and changes the direction thereof, thereby changing the sensitivity for acquiring sound according to the direction from the microphone 63 to the sound source. There is no need to move relative to the image display unit 20, and the structure and configuration of the microphone 63 can be variously modified. For example, the microphone 63b in the modified example may be composed of a plurality of microphones having directivity facing different directions. In this case, the sensitivity with which the microphone 63b acquires the sound for each direction can be changed by not acquiring the sound from some of the plurality of microphones by the operation from the user. In the head-mounted display device 100, since the structure for moving the microphone 63b relative to the image display unit 20 is not required, the directivity of the microphone 63b that acquires sound is set with a simple configuration.

C5. Modification 5:
In the above embodiment, when the angle formed by the line-of-sight direction and the sound source direction is 30 degrees or more, the image of the sound source direction captured by the camera 61 is displayed in the maximum image display area PN, and is close to the image of the sound source direction. Although the character image is displayed, the manner in which the character image is displayed and the position in which the character image is displayed can be variously modified depending on the relationship between the line-of-sight direction and the sound source direction. For example, the character image may always be displayed at a predetermined position in the maximum image display area PN regardless of the angle formed by the line-of-sight direction and the sound source direction. Further, the angle between the line-of-sight direction and the sound source direction is set to 30 degrees as a threshold value, and the position where the character image is displayed in the maximum image display area PN is not set, but an angle larger or smaller than 30 degrees is set as the threshold value. May be set as

C6. Modification 6:
In the above embodiment, the image processing unit 160 performs face authentication on the outside scene image captured by the camera 61 to extract the teacher TE as a sound source. However, the sound source extraction method can be variously modified. For example, an object existing at a certain distance from the user may be extracted as a sound source candidate by a distance measuring sensor.

  In the above embodiment, the voice processing unit 170 identifies different kinds of voices by speaker recognition. However, the voice identification method is not limited to this, and various modifications can be made. For example, when a user listens to a story of a teacher TE who is the same sound source every week as in a university lecture, the voice characteristics of the teacher TE are registered in the head-mounted display device 100 in advance. Can be set not to be converted into a character image. In this head-mounted display device 100, it is not necessary to set sound for each type different from the sound source direction each time, and represents the type of sound that the user wants to display as a character image in the maximum image display area PN. Character images can be identified with high accuracy.

  Moreover, in the said embodiment, although the acquired audio | voice was converted as a character image showing an audio | voice, the method of converting an audio | voice into a character image can be variously deformed. For example, from the viewpoint of privacy protection, it may be set such that the acquired voice is converted into a character image in the performance, and the acquired voice is not recorded. In addition, by registering specific words such as personal names in the head-mounted display device 100 in advance, the registered words are not converted into a character image even if voice is acquired. Also good.

  In addition, the sound registered in advance in the head-mounted display device 100 may be a sound such as an operating sound of a machine. For example, the user visually recognizes a character image representing an operating sound, and the operating sound during normal operation of the industrial machine is registered in advance. In this case, even if the factory where the industrial machine is installed is noisy due to other machines, the user can visually recognize the character image representing the operating sound when the industrial machine is operating abnormally. Can recognize as visual information whether or not the operating state of the industrial machine is normal.

C7. Modification 7:
The configuration of the head-mounted display device 100 in the above embodiment is merely an example and can be variously modified. For example, one of the direction key 16 and the track pad 14 provided in the control unit 10 may be omitted, in addition to the direction key 16 and the track pad 14, or in place of the direction key 16 and the track pad 14, etc. An operation interface may be provided. Moreover, the control part 10 is a structure which can connect input devices, such as a keyboard and a mouse | mouth, and is good also as what receives an input from a keyboard or a mouse | mouth.

  As the image display unit, instead of the image display unit 20 worn like glasses, another type of image display unit such as an image display unit worn like a hat may be adopted. The earphones 32 and 34 and the camera 61 can be omitted as appropriate. Moreover, in the said embodiment, although LCD and a light source are utilized as a structure which produces | generates image light, it replaces with these and you may employ | adopt other display elements, such as an organic EL display. In the above embodiment, the 9-axis sensor 66 is used as a sensor for detecting the movement of the user's head. Instead, one or two of an acceleration sensor, an angular velocity sensor, and a geomagnetic sensor are used. You may use the sensor comprised from. In the above embodiment, the head-mounted display device 100 is a binocular optical transmission type. However, the present invention can be applied to other types of head-mounted display such as a video transmission type and a monocular type. The same applies to the apparatus.

  In the above embodiment, the head-mounted display device 100 may guide image light representing the same image to the left and right eyes of the user so that the user can visually recognize the two-dimensional image. It is also possible to guide the user to visually recognize a three-dimensional image by guiding image light representing a different image to his eyes.

  In the above embodiment, a part of the configuration realized by hardware may be replaced by software, and conversely, a part of the configuration realized by software may be replaced by hardware. Good. For example, in the above-described embodiment, the image processing unit 160 and the sound processing unit 170 are realized by the CPU 140 reading and executing a computer program, but these functional units may be realized by a hardware circuit. Good.

  In addition, when part or all of the functions of the present invention are realized by software, the software (computer program) can be provided in a form stored in a computer-readable recording medium. In the present invention, the “computer-readable recording medium” is not limited to a portable recording medium such as a flexible disk or a CD-ROM, but an internal storage device in a computer such as various RAMs and ROMs, a hard disk, etc. It also includes an external storage device fixed to the computer.

  Moreover, in the said embodiment, as shown in FIG. 1 and FIG. 2, the control part 10 and the image display part 20 are formed as a separate structure, However, about the structure of the control part 10 and the image display part 20, about. However, the present invention is not limited to this, and various modifications are possible. For example, all of the components formed in the control unit 10 may be formed inside the image display unit 20 or a part thereof may be formed. Further, among the configurations formed in the control unit 10, only the operation unit 135 may be formed as a single user interface (UI), or the power source 130 in the above embodiment is formed independently and can be replaced. It may be. Further, the configuration formed in the control unit 10 may be formed in the image display unit 20 in an overlapping manner. For example, the CPU 140 shown in FIG. 2 may be formed in both the control unit 10 and the image display unit 20, or a function performed by the CPU 140 formed in the control unit 10 and the CPU formed in the image display unit 20. May be configured separately.

C8. Modification 8:
For example, the image light generation unit may include an organic EL (Organic Electro-Luminescence) display and an organic EL control unit. Further, for example, the image generation unit may use LCOS (Liquid crystal on silicon, LCoS is a registered trademark), a digital micromirror device, or the like instead of the LCD. Further, for example, the present invention can be applied to a laser retinal projection type head mounted display. In the case of the laser retinal projection type, the “image light emitting area in the image light generation unit” can be defined as an image area recognized by the user's eyes.

  Further, for example, the head-mounted display may be a head-mounted display in which the optical image display unit covers only a part of the user's eye, in other words, the optical image display unit does not completely cover the user's eye. Good. The head mounted display may be a so-called monocular type head mounted display.

  Further, the earphone may be an ear-hook type or a headband type, or may be omitted. Further, for example, it may be configured as a head mounted display mounted on a vehicle such as an automobile or an airplane. Further, for example, it may be configured as a head-mounted display built in a body protective device such as a helmet.

C9. Modification 9:
In the above embodiment, the head-mounted display device 100 that is worn on the user's head is used as the display device that allows the user to visually recognize the character image. However, the display device is not limited to this, and various modifications can be made. Is possible. For example, the head-up display (HUD) used for the windshield of a motor vehicle may be sufficient. In this case, the driver of the automobile as a user can visually recognize the sound outside the automobile as a character image while ensuring a visual field in the traveling direction. In the display device of this modified example, when the hearing impaired person is a driver or when the inside of the car is noisy, the sound outside the car can be recognized as visual information, so external danger information can be recognized as visual information, Safety when driving a car can be increased.

C10. Modification 10:
Further, in the third embodiment, when it is determined in the process of step S507 in FIG. 14 that there is no change in the opening / closing state of the mouth MO of the teacher TE (step S507: NO), the image determination unit 142 continues. However, the detection of the change in the opening / closing state of the mouth MO of the teacher TE is monitored, but the image determination unit 142 does not necessarily need to monitor the detection of the change. For example, when a change in the opening / closing state of the mouth MO of the teacher TE is not detected, the sound source direction may be set with the teacher TE extracted by the image processing unit 160 as the target sound source. In this case, after a change in the opening / closing state of the mouth MO of the teacher TE is detected for the first time, the sound source direction may be set with the mouth MO of the teacher TE as the target sound source.

  In the third embodiment, the voice representing the voice signal acquired by communication by the wireless communication unit 132 is exemplified as the voice different from the voice acquired by the microphone 63. However, the voice is acquired by the microphone 63. The voice and the voice to be a box are not limited to this and can be variously modified. For example, as a voice different from the voice acquired by the microphone 63, a voice acquired by a pin microphone mounted on the chest of the teacher TE separately from the microphone 63 may be used. Further, among the voices acquired by the microphone 63, the voice of the person uttered by the voice processing unit 170 and the voice uttered by a machine or the like are identified, and the font of the character image in which these voices are converted. May be changed. In addition, only one voice among a plurality of different voices may be converted as a character image, and the plurality of voice types may be three or more.

C11. Modification 11:
In the above embodiment, the sound source direction is set from the microphone 63 based on the outside scene image, the user's line-of-sight direction, and the like. However, the method of setting the sound source direction is not limited to this, and various modifications can be made. For example, in microphones having a plurality of directivities, the volume levels (for example, decibels (dB)) acquired from the respective directions may be compared, and the direction with the highest volume may be set as the sound source direction. In the head-mounted display device 100 of this modification, in order to make the user visually recognize the character image representing the sound with the highest volume, for example, even when the user has difficulty in listening to the external sound using headphones or the like. It is possible to make the user recognize external sounds to be noted as visual information.

  In the above embodiment, the position where the character image is displayed is set according to the difference between the line-of-sight direction and the set sound source direction, but the method for setting the position where the character image is displayed is not limited to this. However, various modifications are possible. For example, in this modification, the microphone 63c has the maximum sound volume sensitivity acquired from the A direction and the B direction. When the volume of the acquired volume is the same in the A direction and the B direction at a certain point in time and the volume acquired from the A direction is larger than that in the B direction, The direction determination unit 161 determines that the target sound source has approached the A direction from the B direction. Thereafter, the image processing unit 160 and the image display unit 20 display a character image obtained by converting the sound acquired by the microphone 63c in the vicinity of the A direction in the maximum image display region PN. In this modification, the sensitivity of the sound volume acquired by the microphone 63c differs depending on the direction, and the image processing unit 160 and the image display unit 20 change the position where the character image is displayed based on the acquired sound volume. For this reason, in this modified example, the sound source direction can be set and the character image acquired near the target sound source can be displayed without the camera 61 or the like, so that convenience for the user is improved.

  The sound source direction may be set by GPS (Global Positioning System). For example, when a target sound source that emits a sound to be acquired in advance is known, such as a teacher TE, a GPS module is incorporated in the target sound source, and a GPS module is also incorporated in the image display unit 20. The positional relationship between the image display unit 20 and the teacher TE carrying the GPS module may be specified by receiving the position information of the GPS module. In this modification, the sound source direction is specified in more detail than the sound source direction is specified by the outside scene image of the camera 61 or the microphone 63 having directivity. Note that the method of specifying the sound source direction with respect to the image display unit 20 is not limited to using the GPS module, and various modifications can be made. For example, the teacher TE may carry a communication device that has a one-to-one correspondence with the head-mounted display device 100.

  In addition, the distance from the image display unit 20 to the target sound source is specified by performing triangulation using a satellite by a GPS module or the like, and the characters displayed in the maximum image display area PN based on the specified distance The size of the image may be set. For example, the closer the distance from the image display unit 20 to the target sound source, the larger the character image representing the voice acquired by the camera 61 may be displayed in the maximum image display area PN. In this modified example, since the size of the character image changes according to the distance from the user to the target sound source, the user can recognize the distance to the target sound source as visual information. The size of the character image displayed in the maximum image display area PN may be changed in stages according to the classification of the distance from the image display unit 20 to the target sound source in several stages. . In this case, when the distance is more than a certain distance, the position where the character image is displayed in the maximum image display area PN is displayed at a position shifted from the center of the maximum image display area PN. Visibility may be improved. Further, the type of the character image may be changed instead of the size of the character image, and both the size and the type may be changed. The sound source direction may be specified by the camera 61 or the like, and only the distance from the image display unit 20 to the target sound source may be specified by the GPS module or the like. The GPS module and the wireless communication unit 132 correspond to a distance specifying unit in the claims.

  The method for specifying the distance from the image display unit 20 to the target sound source can be variously modified. As a method for specifying the distance from the image display unit 20 to the target sound source, in addition to using the GPS module, an optical double image coincidence distance meter may be used, or an ultrasonic distance meter may be used. Also good. The image display unit 20 is provided with a plurality of cameras 61 at different locations, and the distance from the image display unit 20 to the target sound source is based on each of the images captured by the cameras 61 at different locations. May be specified. Further, the distance from the image display unit 20 to the target sound source may be specified by irradiating the target sound source with light and receiving and evaluating the reflected light using a light receiving element. Further, the distance may be specified by the intensity of radio waves of the wireless LAN.

  FIG. 17 is an explanatory diagram illustrating an external configuration of a head-mounted display device according to a modification. In the case of the example in FIG. 17A, the difference from the head-mounted display device 100 shown in FIG. 1 is that the image display unit 20c includes a right optical image display unit 26c instead of the right optical image display unit 26. And a point provided with a left optical image display unit 28 c instead of the left optical image display unit 28. The right optical image display unit 26c is formed smaller than the optical member of the above-described embodiment, and is disposed obliquely above the right eye of the user US when the head-mounted display device 100c is worn. Similarly, the left optical image display unit 28c is formed smaller than the optical member of the above-described embodiment, and is disposed obliquely above the left eye of the user US when the head-mounted display device 100c is worn. In the case of the example of FIG. 17B, the difference from the head-mounted display device 100 shown in FIG. 1 is that the image display unit 20d includes a right optical image display unit 26d instead of the right optical image display unit 26. And a point provided with a left optical image display unit 28d instead of the left optical image display unit 28. The right optical image display unit 26d is formed smaller than the optical member of the above embodiment, and is disposed obliquely below the right eye of the user US when the head mounted display is mounted. The left optical image display unit 28d is formed smaller than the optical member of the above-described embodiment, and is disposed obliquely below the left eye of the user US when the head mounted display is mounted. Thus, it is sufficient that the optical image display unit is disposed in the vicinity of the eyes of the user US. The size of the optical member forming the optical image display unit is also arbitrary, and the optical image display unit covers only a part of the eyes of the user US, in other words, the optical image display unit covers the eyes of the user US. This can be realized as a head-mounted display device 100 that is not completely covered.

  The present invention is not limited to the above-described embodiments and modifications, and can be realized with various configurations without departing from the spirit of the present invention. For example, the technical features in the embodiments and the modifications corresponding to the technical features in each form described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Control part 11 ... Decision key 12 ... Illumination part 13 ... Display switch key 14 ... Trackpad 15 ... Luminance switch key 16 ... Direction key 17 ... Menu key 18 ... Power switch 20 ... Image display part (display position setting part)
DESCRIPTION OF SYMBOLS 21 ... Right holding part 22 ... Right display drive part 23 ... Left holding part 24 ... Left display drive part 26 ... Right optical image display part 28 ... Left optical image display part 30 ... Earphone plug 32 ... Right earphone 34 ... Left earphone 40 ... Connection unit 42 ... right cord 44 ... left cord 46 ... connecting member 48 ... body cord 51, 52 ... transmission unit 53, 54 ... reception unit 61 ... camera (image acquisition unit)
63 ... Microphone (voice acquisition unit)
66 ... 9-axis sensor (gaze direction estimation unit)
DESCRIPTION OF SYMBOLS 100 ... Head-mounted display apparatus 110 ... Input information acquisition part 120 ... Memory | storage part 130 ... Power supply 132 ... Wireless communication part (communication part, distance specific | specification part)
135 ... operation unit (specific direction setting unit)
140 ... CPU
142: image determination unit 150: operating system 160: image processing unit (display position setting unit)
161... Direction determination unit (gaze direction estimation unit)
163 ... Microphone drive unit (voice acquisition unit)
170: Voice processing unit (voice identification unit)
180 ... Interface 185 ... Conversion unit 190 ... Display control unit 201 ... Right backlight control unit 202 ... Left backlight control unit 211 ... Right LCD control unit 212 ... Left LCD control unit 221 ... Right backlight 222 ... Left backlight 241 ... Right LCD
242 ... Left LCD
251 ... Right projection optical system 252 ... Left projection optical system 261 ... Right light guide plate 262 ... Left light guide plate VSync ... Vertical sync signal HSync ... Horizontal sync signal PCLK ... Clock signal OA ... External device WB ... Whiteboard TE ... Teacher ST, ST1 ST2, ST3 ... Student CM ... Instruction image PN ... Maximum image display area CR ... Cursor VR ... User's field of view NT ... Notebook PEN ... Pen IMG ... Image BIM ... Outside scene image TX1, TX2, TX3, TX11, TX12, TX31, TX32, TX33, TX34, TX35, TX41, TX42 ... Text image MO ... Teacher TE's mouth

Claims (29)

A transmissive display device,
An image display unit that generates image light representing an image, allows a user to visually recognize the image light, and transmits an outside scene;
An audio acquisition unit for acquiring audio;
A conversion unit for converting the sound into a character image represented as an image by characters;
A specific direction setting unit for setting a specific direction;
A display position setting unit configured to set an image display position that is a position for visually recognizing the character image light representing the character image in the visual field of the user based on the specific direction. The display device according to claim 1,
The display position setting unit sets the image display position so as not to overlap with a position corresponding to the specific direction in a user's visual field. The display device according to claim 1 or 2,
The display position setting unit sets the image display position to a position corresponding to a position other than the center in the user's visual field. A display device according to any one of claims 1 to 3,
The sound acquisition unit has different sensitivities for acquiring sound according to the direction from the sound source to the sound acquisition unit,
The display device in which the specific direction is set based on the sensitivity of the acquired sound. A display device according to any one of claims 1 to 3,
The display device, wherein the specific direction is a direction from the sound acquisition unit to a sound source. The display device according to any one of claims 1 to 5, further comprising:
An image acquisition unit that acquires images of outside scenes at a plurality of points in time,
The image display position setting unit sets the image display position based on a change in the image of the outside scene at a plurality of points in time and the specific direction. The display device according to any one of claims 1 to 6, further comprising:
A distance specifying unit for specifying a distance from the display device to the sound source;
The display device, wherein the display position setting unit performs at least one of a change in the size of the character image light and the image display position and setting based on the specified distance. The display device according to any one of claims 1 to 7, further comprising:
A distance specifying unit for specifying a distance from the display device to the sound source;
The said conversion part is a display apparatus which changes the kind of said character image based on the specified distance. A display device according to any one of claims 1 to 8,
The sound acquisition unit is different in sensitivity for acquiring sound volume according to the direction from the sound source to the sound acquisition unit,
The display device, wherein the display position setting unit sets the image display position based on a volume of sound acquired differently for each direction in which different same sound sources emit. A display device according to any one of claims 1 to 9,
The display device, wherein the sound acquisition unit is set so that sensitivity for acquiring sound differs according to a direction from a sound source to the sound acquisition unit, and sensitivity for acquiring sound from the specific direction is maximized. The display device according to any one of claims 1 to 10, further comprising:
A voice identification unit for identifying different types of voice acquired from a plurality of sound sources for each type of voice;
An operation unit for receiving an operation by a user,
The specific direction setting unit specifies a specific sound source direction that is a direction from the sound acquisition unit to a sound source from which one of the plurality of sounds is acquired based on the operation,
The display position setting unit is configured to set, in a user's field of view, a position where the character image light representing the one voice is visually recognized near a position corresponding to the specific sound source direction. The display device according to claim 11,
The display position setting unit sets a position at which the user visually recognizes the image light representing the one sound in a visual field to a position that does not overlap any of a plurality of positions corresponding to the specific sound source directions. Display device. A display device according to claim 11 or claim 12,
The image display unit generates a plurality of the voices in the character image light that is different for each type of sound, and allows a user to visually recognize the image light for each of the plurality of types of sound,
The operation is an operation of specifying the character image light corresponding to the sound from one specific sound source direction from the character image light for each of a plurality of types of the sound visually recognized in the user's visual field. Display device. A display device according to any one of claims 1 to 13,
The image display unit is a display device that causes a user to recognize the character image light as a virtual image after a predetermined time delay from the time when the sound acquisition unit acquires the sound. The display device according to any one of claims 1 to 14, further comprising:
A gaze direction estimation unit for estimating the gaze direction of the user,
The image display unit allows the user to visually recognize the image light in a state of being worn on the user's head,
The display position setting unit sets the image display position based on a relationship between the specific direction and the line-of-sight direction. The display device according to claim 15,
The display position setting unit, when a specific angle, which is an angle formed by the line-of-sight direction and the specific direction, is less than a first threshold, is near the position corresponding to the specific direction in the user's visual field. A display device that sets an image display position, and sets the image display position regardless of the specific direction when the specific angle is equal to or greater than a first threshold. The display device according to claim 15 or 16, further comprising:
An image acquisition unit for acquiring an image of the outside scene,
The image display unit is an image light that represents an image in the specific direction acquired by the image acquisition unit when a specific angle that is an angle formed by the line-of-sight direction and the specific direction is equal to or greater than a second threshold. When a specific direction image light is generated and visually recognized by the user, and the specific angle is less than a second threshold, the specific direction image light is not generated,
The display position setting unit sets a position for recognizing the image light in the specific direction not to overlap the image display position and close to the image display position when the specific angle is equal to or greater than a second threshold. And when the said specific angle is less than a 2nd threshold value, the said image display position is set near the position corresponding to the said specific direction in a user's visual field. The display device according to any one of claims 1 to 17, further comprising:
A voice identification unit for identifying the acquired voice and a specific voice different from the acquired voice;
The said conversion part is a display apparatus which converts the acquired audio | voice and the said specific audio | voice into the said character image of a different kind. The display device according to claim 18, further comprising:
A communication unit that acquires an audio signal by communication,
The display device, wherein the specific sound is a sound output based on a sound signal acquired by the communication unit. A transmissive head-mounted display device,
An image display unit that generates image light representing an image and allows the user to visually recognize the image light while being mounted on the user's head;
An audio acquisition unit for acquiring audio;
A conversion unit for converting the sound into a character image represented as an image by characters;
A gaze direction estimation unit that estimates the gaze direction of the user;
A head-mounted display device comprising: a display position setting unit that sets an image display position that is a position for visually recognizing the character image light representing the character image in the visual field of the user based on the change in the line-of-sight direction. The head-mounted display device according to claim 20,
The sound acquisition unit is different in sensitivity for acquiring sound volume according to the direction from the sound source to the sound acquisition unit,
The head-mounted display device, wherein the display position setting unit sets the image display position based on sound volume obtained differently for each direction in which different same sound sources emit. The head-mounted display device according to claim 20 or 21,
The line-of-sight direction estimation unit estimates a specific value of at least one of an angular velocity and an angle change amount in the line-of-sight direction with reference to a display state in which the character image light is recognized by a user,
The display position setting unit is a head-mounted display device that sets the image display position other than the central part in the user's visual field when the specific value exceeds a certain value. The head-mounted display device according to claim 22,
The line-of-sight direction estimation unit estimates a gravity direction and a horizontal direction perpendicular to the gravity direction,
The head-mounted display device, wherein the display position setting unit sets the image display position in a user's field of view based on the specific value in the display state with respect to the gravity direction and the horizontal direction. The head-mounted display device according to claim 22 or claim 23,
The display position setting unit sets the image display position other than the central portion in the user's visual field when the angle change amount is equal to or greater than a third threshold value, and the angle change amount is a third threshold value. The head-mounted display device that sets the image display position to a preset position in the user's visual field when the number is less than. The head-mounted display device according to any one of claims 22 to 24,
The display position setting unit sets the image display position at a central portion in the user's field of view when a predetermined time has elapsed with the change amount of the angle being less than a fourth threshold, and the change of the angle. A head-mounted display device that sets the image display position in a region other than the center in the user's visual field when the amount is equal to or greater than a fourth threshold. The head-mounted display device according to any one of claims 22 to 25,
The display position setting unit sets the image display position other than the central part in the user's visual field when the angular velocity is equal to or greater than a fifth threshold, and when the angular velocity is less than the fifth threshold, A head-mounted display device that sets the image display position at a preset position in a user's visual field. A head-mounted display device according to any one of claims 22 to 26, wherein:
The display position setting unit sets the image display position at a central portion in the user's field of view when the predetermined time has elapsed with the angular velocity being less than a sixth threshold, and the angular velocity is a sixth threshold. In the above case, the head-mounted display device that sets the image display position other than the central portion in the visual field of the user. A control method for a transmissive display device, which generates an image light representing an image, allows a user to visually recognize the image light, and includes an image display unit that transmits an outside scene.
Obtaining audio,
Converting the sound into a character image represented as an image by characters;
Generating character image light that is image light representing the character image, allowing the user to visually recognize the character image light, and transmitting the outside scene;
Setting a specific direction;
And a step of setting a position for visually recognizing the character image light in the visual field of the user based on the specific direction. A transmissive head-mounted display device having an image display unit that generates image light representing an image and allows the user to visually recognize the image light while being mounted on the user's head, and transmits an outside scene. Control method,
Obtaining audio,
Converting the sound into a character image represented as an image by characters;
Generating character image light that is image light representing the character image, allowing the user to visually recognize the character image light while the image display unit is mounted on the user's head, and transmitting the outside scene;
Estimating a user's gaze direction;
And a step of setting a position for visually recognizing the character image light in the visual field of the user based on the line-of-sight direction.

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