JP6347067B2 - Eyeglass type display device - Google Patents

Description

  The present invention relates to a glasses-type display device that can be worn around a user's eyes.

  Conventionally, as this type of eyeglass-type display device, for example, there is a head mounted display device (hereinafter referred to as an HMD device) described in Patent Document 1 below. This HMD apparatus first introduces an image display means, an observation optical means for guiding an image displayed on the image display means to a user's eye, and an image from the outside world into the optical path of the observation optical means, and from the outside world. And an optical path synthesis means for allowing the image displayed on the image display means to be observed, and detecting a gazing point within the user's observation range and outputting a gazing point detection signal. Viewpoint detection means. The HMD device further accommodates the above four means and includes a housing configured to be fixed around the user's eye, and a control unit that controls the image display means based on the gazing point detection signal; It is equipped with.

Japanese Patent Laid-Open No. 09-212376

  As described above, in the conventional glasses-type display device, the image displayed on the image display means (that is, the image representing the predetermined information from the projection device) is replaced with the image from the outside (that is, the image representing the scenery in front of the user). ) Are superimposed and provided to the user as a composite image. However, various parameters may differ from design values depending on the shape of the user's face and / or the manner in which the glasses-type display device is worn. As a result, the predetermined information may not be superimposed at an appropriate position in the scene in front of the user.

  Therefore, an object of the present invention is to provide a glasses-type display device that can superimpose predetermined information at a more appropriate position in the user's forward scenery.

In order to achieve the above object, one aspect of the present invention is directed to a glasses-type display device, and is provided on the frame so as to be attached to a user's face and capable of photographing the front of the user. A first imaging device, a projection device provided on the frame so as to be able to project a first light beam representing predetermined information, and an eyepiece optical system provided on the frame so that it can be placed in front of the user's eyes when worn. When the first luminous flux from the projection device and the second luminous flux representing the scenery in front of the user are incident, the third luminous flux in which the predetermined information is superimposed on the scenery is applied to the user's eyes. A distance between the eyepiece optical system configured to be able to emit light toward the user and the eye of the user and the eyepiece optical system is derived as a first distance, and based on the derived first distance, the predetermined on the scene Where the information is superimposed And a control circuit for integer, the ocular optical system, and emitted to the fourth light flux and fifth light flux representing a first mark and the second mark in the first position and the second position in the eye of the user, The control circuit detects the user's first line of sight and the second line of sight after emission of the fourth light beam and the fifth light beam, and based on the detected first line of sight and second line of sight, the user's eyes and the eyepiece A first distance to the optical system is derived .

  According to the above aspect, it is possible to superimpose predetermined information at a more appropriate position in the user's forward scenery.

1 is an external perspective view showing an eyeglass-type display device according to a first embodiment of the present invention. FIG. 2 is a functional block diagram of the eyeglass-type display device of FIG. 1. It is a longitudinal cross-sectional view of the eyepiece optical system and projection apparatus of FIG. FIG. 3 is a flowchart showing a processing procedure when the control circuit of FIG. 2 is not considered individual differences. It is a schematic diagram which shows the display position of the predetermined | prescribed information calculated | required by the process of FIG. FIG. 3 is a flowchart showing a procedure of processing for obtaining a first distance (measured value), which is processing of the control circuit of FIG. 2. It is a schematic diagram which shows the content of the process of FIG. FIG. 3 is a flowchart showing a procedure of the process of the control circuit of FIG. 2 when individual differences are taken into consideration. It is a schematic diagram which shows the display position of the predetermined | prescribed information calculated | required by the process of FIG. It is a figure which shows the 2nd modification of the display method of a 1st mark and a 2nd mark. It is an external appearance perspective view which shows the spectacles type display apparatus which concerns on a 3rd modification. It is a functional block diagram of the spectacles type display apparatus of FIG. FIG. 13 is a flowchart showing a procedure of processing for obtaining a first distance (measured value), which is processing of the control circuit of FIG. 12. It is a schematic diagram which shows the content of the process of FIG. It is a 1st schematic diagram which shows the 1st mark and 2nd mark which concern on a 4th modification. It is a 2nd schematic diagram which shows the 1st mark and 2nd mark which concern on a 4th modification. It is a flowchart for calculating | requiring the 1st distance (measured value) and 3rd distance (measured value) of the spectacles type display apparatus which concern on 2nd embodiment. It is a schematic diagram which shows the content of the process which calculates | requires a 3rd distance in FIG. FIG. 10 is a flowchart showing a processing procedure when the control circuit according to the second embodiment considers individual differences. It is a schematic diagram which shows the display position of the predetermined | prescribed information calculated | required by the process of FIG.

《Camera coordinate system》
Prior to the description of the eyeglass-type display device 1a according to each embodiment of the present invention, the X axis, the Y axis, and the Z axis shown in several drawings are defined. The X axis, the Y axis, and the Z axis are orthogonal to each other. The Y-axis is the line-of-sight direction (that is, the front-rear direction) when a standard user looks directly in front with the glasses-type display device 1a attached. Here, the standard user is a virtual model set in order to design the glasses-type display device 1a. The X axis and the Z axis indicate the left and right direction (that is, the horizontal direction) and the up and down direction when looking directly in front in the same state.

<< first embodiment >>
With reference to FIG. 1 and FIG. 2, a schematic configuration of the glasses-type display device 1a will be described. The eyeglass-type display device 1 a includes a frame 2, an eyepiece optical system 3, a projection device 4, a transparent member 5, first and second cameras 61 and 62, and an operating device 7.

  The frame 2 is a member that allows the eyeglass-type display device 1a to be mounted around the user's eyes. Here, in the following description, the time when the user wears the glasses-type display device 1a around the eye is simply abbreviated as the time of wearing. The frame 2 includes, for example, right and left temples 21R and 21L, right and left hinges 22R and 22L, a bridge 23, and right and left nose pads 24R and 24L.

  The eyepiece optical system 3 has a shape similar to that of the right lens of general glasses, and is fixed between the left end of the hinge 22R and the right end of the bridge 23. The eyepiece optical system 3 is positioned in front of the right eye when worn. The eyepiece optical system 3 is configured to transmit a light beam from the front (that is, a second light beam representing the scene in front of the user) so that the user can visually recognize the scene in front.

  The projection device 4 is fixedly attached to the periphery of the eyepiece optical system 3 so as not to block the user's front view. In the illustrated example, the mounting position of the projection device 4 is the upper peripheral edge of the eyepiece optical system 3. However, the attachment position may be any peripheral edge, up, down, left and right. The projection device 4 projects a first light beam representing predetermined information onto the eyepiece optical system 3. Here, the predetermined information is typically the object α (see FIG. 5 and the like) obtained from the first image signal obtained from the first camera 61, or the control circuit 72 provided in the operation device 7. Or character information generated by.

  Here, FIG. 3 is a longitudinal sectional view of the longitudinal sections of the eyepiece optical system 3 and the projection device 4 taken along the imaginary line I-I ′ in FIG. 1 when viewed from the X-axis direction. Here, this longitudinal section is assumed to be substantially parallel to the YZ plane. Hereinafter, with reference to FIGS. 1-3, each structure is explained in full detail in order of the projection apparatus 4 and the eyepiece optical system 3. FIG.

  The projection device 4 includes a light source 41, a condenser lens 42, and a transmissive display panel 43 in a housing 44. The light source 41 is, for example, an LED (Light Emitting Diode) or the like, and typically emits white light. Here, in FIG. 3, an optical path is virtually shown by a broken line. The condensing lens 42 includes a condenser lens and the like, condenses the light emitted from the light source 41, and emits it as substantially parallel light (hereinafter referred to as parallel light). The transmissive display panel 43 is, for example, a spatial light modulator LCD, and receives parallel light from the condenser lens 42 and receives the predetermined information from the control circuit 72. The transmissive display panel 43 modulates incident light with received information to generate a first light beam representing predetermined information, and emits the light toward the upper end surface P <b> 1 of the eyepiece optical system 3.

  The eyepiece optical system 3 includes a transparent member 31, a prism 32 formed integrally with the transparent member 31, and a holographic optical element (hereinafter sometimes referred to as HOE) 33.

  The prism 32 is made of a transparent material such as glass or resin, and has a front surface P2 and a back surface P3 facing in the Y-axis direction, for example. Here, the front surface P2 and the back surface P3 are designed to be substantially parallel to the ZX plane and orthogonal to the Y axis. The prism 32 extends downward from the upper end surface P1 of the eyepiece optical system 3. The first light flux emitted from the transmissive display panel 43 enters the prism 32 from the upper end surface P1. The incident light beam repeats total reflection on the front surface P2 and the back surface P3, propagates downward in the prism 32, and is guided toward the HOE 33.

  The HOE 33 is formed on a thin plate-like substrate, and is provided between the prism 32 and the transparent member 31 so that the substrate surface is obliquely positioned in front of the right eye when mounted. The HOE 33 has a pattern composed of two types of interference fringes that are non-parallel to the substrate surface.

  The first light flux that has propagated through the prism 32 is incident on the HOE 33. The HOE 33 diffracts and reflects the incident light beam toward the right eye by the diffraction action of the interference fringe pattern. As a result, the eyepiece optical system 3 can virtually display predetermined information to the user.

  Moreover, as above-mentioned, the eyepiece optical system 3 is comprised so that the 2nd light beam showing a front scene can be permeate | transmitted. More specifically, a correction prism (not shown) is joined to the HOE 33 so that the incident light beam is not refracted by the HOE 33. Therefore, the HOE 33 functions as a mere flat glass for the second light flux, so that the user can visually recognize the front scene.

  As is clear from the above, the user visually recognizes, with the right eye, an image in which predetermined information represented by the first scenery is combined with the forward scenery represented by the second light flux through the eyepiece optical system 3.

  Here, referring to FIG. 1 again. The transparent member 5 has a shape similar to that of a left lens of general glasses, and is fixed between the right end of the left hinge 22L and the left end of the bridge 23. The transparent member 5 is configured to be able to transmit a light beam from the front in order to secure the user's front view.

  The first camera 61 is fixedly mounted on the right side surface of the right temple 21R. Here, the first camera 61 is attached so that its own optical axis 61a is substantially parallel to the Y axis and performs imaging at the same Y-axis direction position as the standard user viewpoint position. The first camera 61 captures an image representing a scene in its field of view at a predetermined frame rate, and transmits the image as a first video signal to the operation device 7.

  The second camera 62 is fixedly attached to the upper surface of the right hinge 22R. Here, the optical axis 61a of the second camera 62 is designed to face the right eye so that the second camera 62 can photograph the right eye when mounted. The second camera 62 described above captures an image of the right eye at a predetermined frame rate as necessary, and transmits the image to the controller 7 as a second video signal.

  Reference is now made to FIG. 2 in addition to FIG. The operating device 7 includes an HMI 71 (more specifically, a power switch and operation buttons) 71 that is manually operated by a user. The operation device 7 includes a control circuit 72 in the housing. The control circuit 72 includes at least a communication interface (illustrated communication IF) 73, a CPU 74, an EEPROM 75, and a RAM 76.

  The communication IF 73 receives various information from the first camera 61, the second camera 62, and the HMI 71 and transfers it to the CPU 74. In addition, the communication IF 73 transmits various information from the CPU 74 to the projection device 4.

  The CPU 74 operates in accordance with a program stored in advance in the EEPROM 75 while using the RAM 76 as a work area.

  By the way, as is clear from the description in the column “Problems to be Solved by the Invention”, when the distance between the right eye and the eyepiece optical system 3 at the time of wearing differs from the design value due to individual differences, the predetermined information is the eyepiece. In some cases, the image is not displayed at an appropriate position in the optical system 3.

<When not considering individual differences>
Hereinafter, the operation of the control circuit 72 when individual differences are not taken into account will be described with reference to the flowchart of FIG. In this case, the viewpoint of the user is at a position as designed with respect to the present glasses-type display device 1a. That is, the user viewpoint is at the same position as the standard user viewpoint. Here, for convenience of explanation, the viewpoint position of the standard user at the time of wearing is assumed to be C as shown in FIG. Also, let A be the position of the intersection of the surface passing through the position C and substantially parallel to the back surface P3 of the eyepiece optical system 3 and the optical axis 61a of the first camera 61. The position of the object α is B. Moreover, the distance from each part of this spectacles type display apparatus 1a to a viewpoint is illustrated as follows.
X-axis direction distance from intersection A to viewpoint C (design value) d: 50 mm
Distance (design value) 1 between back P3 and viewpoint C (an example of the first distance): 20 mm

  First, the CPU 74 detects an object α (see FIG. 5) to be displayed on the eyepiece optical system 3 (FIG. 4: S01). Specifically, the CPU 74 acquires the second video signal of the second camera 62 for one frame, and acquires the first video signal of the first camera 61 for one frame. Next, the CPU 74 detects a line-of-sight vector from the acquired second video signal (more specifically, one frame) by a known line-of-sight detection method. Next, the CPU 74 specifies a gazing point at which the scene (that is, the image) represented by the acquired first video signal and the detected gaze vector intersect by a known gazing point detection method. Next, the CPU 74 specifies the object (that is, the subject) α shown in the specified gazing point in the landscape represented by the first video signal, and specifies the position of the gazing point as the position B of the object α. .

  Here, in FIG. 5, the intersection of the straight line passing through the point C and parallel to the line segment AB and the back surface P3 of the eyepiece optical system 3 is D, and the intersection of the line segment CB and the back surface P3 is E. In ΔABC and ΔCDE, the relationship of ∠CDE = ∠BAC and the relationship of ∠ACB = ∠DEC are established from the relationship of the complex angle with respect to the parallel lines. Here, the orientation of the object α with respect to the first camera 61 and the orientation of the point D with respect to the viewpoint C are substantially the same. When the object α is very far away, even if the object α extracted from the first video signal is displayed at the position D of the eyepiece optical system 3, the user does not feel strange. However, when the target object α is relatively close, the target object α that the user visually recognizes does not exist in the direction of the position D. Therefore, as illustrated in the upper part of FIG. When the object α is displayed at the position D, the user feels uncomfortable.

  Such discomfort is caused by the parallax between the position of the first camera 61 and the viewpoint position of the user. In order to correct this parallax, the CPU 74 determines to display the object α extracted from the first video signal at the point E. When this point E is set as the display position, as shown in the lower part of FIG. 5, the orientation of the actual object α with respect to the user coincides with the orientation of the display position E with reference to the user. Can be reduced.

  In order to obtain the position of the point E, the CPU 74 detects an optical axis direction distance L (an example of the second distance) from the object α detected in S01 to the line segment AC (an example of the second distance) (FIG. 4: S02). It is determined whether or not> Lref is satisfied (FIG. 4: S03). This Lref is a reference value for evaluating whether or not the object α is far away.

  When it is determined Yes in S03, the CPU 74 obtains the position of the intersection D and determines the display position of the object α specified from the first video signal (FIG. 4: S04).

On the other hand, when it is determined No in S03, the CPU 74 obtains the position of the intersection E, and decides the obtained position as the display position of the object α extracted from the first video signal (FIG. 4: S05). More specifically, when the distance between the intersection D and the intersection E is a parallax a, a is calculated from the following equation (1).
a = 1 × d / L (1)

  Further, the CPU 74 obtains the position of the point E by obtaining the position of the intersection point D in the same manner as in S04 and then translating it by the parallax “a” to the X axis positive direction side. Here, in this embodiment, d = 50 mm and l = 20 mm. Further, when L obtained in S02 is L = 400 mm, a is 2.5 mm.

  After execution of S04 or S05, the CPU 74 executes the following display control (FIG. 4: S06). Specifically, the CPU 74 generates image information that can display the object α extracted from the first video signal at the position D or E determined in S04 or S05 as an example of predetermined information. The CPU 74 transmits the generated predetermined information to the transmissive display panel of the projection device 4 via the communication IF 73. The projection device 4 performs the above processing. As a result, the eyepiece optical system 3 emits a third light beam, which is a combination of the first light beam and the second light beam, toward the eye. Accordingly, the user visually recognizes an image obtained by combining predetermined information with the front scene via the eyepiece optical system 3.

《When considering individual differences》
Next, the operation of the control circuit 72 when individual differences are taken into account will be described. In this case, since the viewpoint is not in the position as designed, it is not preferable to apply the above-described parallax a. Therefore, the control circuit 72 obtains the first distance l ′ according to the procedure of the flowchart of FIG. 6 at a predetermined timing (for example, when worn by the user or when the user performs a predetermined operation on the HMI 71).

  First, as shown in the upper part of FIG. 7, the CPU 74 generates a first image signal capable of displaying the first mark β1 at the first position F on the back surface P3 and transmits the first image signal to the projection device 4 via the communication IF 73. . When receiving the first image signal, the projection device 4 displays the first mark β1 at the first position F on the back surface P3. That is, the projection device 4 emits a fourth light beam representing the first mark β1 at the first position F to the user, thereby prompting the user to gaze. The CPU 74 obtains one frame of the second video signal of the second camera 62 with the user's gaze, and then obtains the second video signal (more specifically, one frame) by a known gaze detection method. Then, a first line-of-sight vector connecting the current viewpoint of the user and the first mark β1 is detected (FIG. 6: S11).

  Next, as described above, the eyepiece optical system 3 emits a fourth light beam representing the second mark γ1 at the second position G to the user under the control of the CPU 74 as shown in the middle part of FIG. To prompt the user to gaze at the second mark γ1. Here, the second position G is preferably a position translated from the first position F in the X-axis direction. In a state in which the user is gazing, the CPU 74 detects a second line-of-sight vector from the current viewpoint of the user toward the second mark γ1 from the second video signal of the second camera 62 (FIG. 6: S12). Here, the reference of the directions of the first line-of-sight vector and the second line-of-sight vector may be appropriately selected as appropriate. In the present embodiment, the reference for the direction of the first line-of-sight vector and the second line-of-sight vector is the line segment FG.

  Next, the CPU 74 obtains the position of the intersection H of the two line-of-sight vectors obtained in S11 and S12, and then sets the distance from the obtained intersection H to the back surface P3 as the first distance as shown in the lower part of FIG. (Measured value) Obtained as l ′ (FIG. 6: S13). Here, the intersection H is substantially equal to the viewpoint position when the user looks directly in front. The first distance l 'is the distance from the intersection H to the leg of the perpendicular in the perpendicular drawn from the intersection H to the plane P3.

  The CPU 74 stores the first distance l ′ obtained in S13 in the EEPROM 75 (FIG. 6: S14), and ends the process in FIG.

After the end of FIG. 6, the CPU 74 displays predetermined information on the eyepiece optical system 3 according to the procedure of the flowchart of FIG. 8. Hereinafter, the processing procedure of FIG. 8 will be described in detail. In this case, the viewpoint position is at the intersection H as shown in FIG. 9, and the first distance l ′ from the intersection H to the back surface P3 is stored in the EEPROM 75 as apparent from the above. In addition, the position of an object α, which will be described later, is set to B for the sake of convenience. Moreover, the distance to the viewpoint with respect to each part of this spectacles type display device 1a is illustrated as follows.
X-axis direction distance from intersection A to intersection H (measured value) d: 50 mm
First distance (measured value) l ′ between back surface P3 and intersection H: 26 mm

  First, the CPU 74 performs the same processing as S01 to S03 in FIG. 4 (FIG. 8: S21 to S23).

  When it is determined Yes in S23, the CPU 74 performs the same process as S04 in FIG. 4 and determines the display position D of the object α (FIG. 8: S24).

  When it is determined No in S23, the CPU 74 checks whether or not the first distance (measured value) 1 'is stored in the EEPROM 75 (FIG. 8: S25).

  When it is determined No in S25, the CPU 74 determines the display position D in the same manner as S04 in FIG. 4 (FIG. 8: S26).

When it is determined Yes in S25, the CPU 74 executes S27. In S27, the CPU 74 first reads the first distance (measured value) l ′ from the EEPROM 75, rewrites l in the above equation (1) to l ′, and changes to the following equation (2).
a ′ = l ′ × d / L (2)
Further, the CPU 74 substitutes l ′, d, and L into the above equation (2) to approximately obtain the parallax a ′ considering individual differences.

  Further, the CPU 74 obtains the position of the point D, and translates it from the obtained position of the point D to the X axis positive direction side by the parallax a ′ to obtain the position of the point E ′ (FIG. 8: S27). Here, in this embodiment, d = 50 mm and l ′ = 26 mm. Further, when L obtained in S22 is 400 mm, a ′ is 3.25 mm.

  After execution of S24, S26, or S27, the CPU 74 executes the following display control (FIG. 8: S28). Specifically, the CPU 74 uses, as an example of the predetermined information, image information that can display the object α extracted from the first video signal at the position of the point D or the point E ′ determined in S24, S26, or S27. Generate. The CPU 74 transmits the generated predetermined information to the projection device 4 via the communication IF 73. The projection device 4 performs the above processing. As a result, the eyepiece optical system 3 emits a third light beam, which is a combination of the first light beam and the second light beam, toward the eye. Accordingly, the user visually recognizes an image obtained by combining predetermined information with the front scene via the eyepiece optical system 3. Here, in any case, the predetermined information is displayed at or near the same position of the object in the front scene.

"effect"
As described above, according to the glasses-type display device 1a, the first distance (measured value) l ′ can be obtained by the process of FIG. 6 even if the viewpoint position of the user is shifted from the design value in the Y-axis direction due to individual differences. Is calculated. Then, the parallax a ′ is calculated using the first distance (measured value) l ′ by the process of FIG. Thereby, the display position of the predetermined information can be made more preferable corresponding to the viewpoint position of each user.

  Further, according to the glasses-type display device 1a, the optical axis 61a of the first camera 61 is substantially parallel to the line-of-sight direction when the standard user looks directly in front. Thereby, it is possible to suppress the error caused by the deviation between the optical axis 61a and the line of sight and display predetermined information at a more correct position.

  Further, according to the present glasses-type display device 1a, it is possible to measure the first distance l 'between the user's current viewpoint and the eyepiece optical system 3 by executing the processing of FIG.

<First modification>
The eyepiece optical system 3 places a third mark at the third position between the display of the first mark β1 at the first position and the display of the second mark γ1 at the second position on the time axis. You may display. Here, the third position is preferably located between the first position and the second position. Thereby, the mark is visually recognized as if it moved from the first position to the second position via the third position. In this way, the control circuit 72 can prompt the user to move the line of sight from the first position to the second position, so that the first distance l ′ can be detected more accurately.

《Second modification》
In the above-described embodiment, the first mark and the second mark are described as being simply displayed on the eyepiece optical system 3. However, as illustrated in FIG. 10, the first mark and the second mark may be repeatedly turned on / off on the time axis so as to be more conspicuous. In addition, the first mark and the second mark may be displayed with different luminances at the time of lighting and another lighting. With the display control as described above, it is possible to more effectively prompt the user to pay attention.

《Third modification》
Next, an eyeglass-type display device 1b according to a third modification will be described with reference to FIGS. 11 and 12, the eyeglass-type display device 1b differs from the eyeglass-type display device 1a shown in FIGS. 1 and 2 in that the operation detection unit 81 is further provided in terms of configuration, It differs in that a part of the processing for obtaining the one distance l ′ is different. Other than that, there is no difference between the binocular display devices 1a and 1b. Therefore, in FIGS. 11 and 12, components corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

  The operation detection unit 81 is, for example, a sensor that detects a predetermined operation by the user, and is realized by a so-called touch screen or proximity sensor. The operation detection unit 81 is attached on the circumferential surface of the first camera 61 in the description of the present modification. When the user brings a finger close to the operation detection unit 81 or touches the operation detection unit 81 with a finger, the operation detection unit 81 transmits a signal indicating that the user has performed a predetermined operation to the control circuit 72.

  Next, with reference to the flowchart of FIG. 13, an operation for obtaining the first distance l ′ by the glasses-type display device 1 b will be described.

  In FIG. 13, under the control of the CPU 74, the eyepiece optical system 3 emits a fourth light beam representing the first mark β2 around the aforementioned first position F to the user as shown in the upper part of FIG. Urge the user to watch the first mark β2. The first mark β2 is displayed so as to move within a range where the user's line of sight does not move so much (around the first position F). Here, a part of the first mark β2 may move, or all of it may move.

  When the user gazes at the first mark β2, the user performs a predetermined operation on the operation detection unit 81. In response to this, the operation detection unit 81 transmits a detection signal to the control circuit 72. Thereafter, the CPU 74 detects the first line-of-sight vector from the user viewpoint toward the first mark β2 from the second video signal of the second camera 62 by a well-known line-of-sight detection method with the user gazing (FIG. 13: S31).

  Next, under the control of the CPU 74, the eyepiece optical system 3 emits a fourth light beam representing the second mark γ2 around the aforementioned second position G to the user as shown in the lower part of FIG. The user is encouraged to gaze at the second mark γ2. In a state in which the user is gazing, the CPU 74 detects a second line-of-sight vector from the current viewpoint of the user toward the second mark γ2 from the second video signal of the second camera 62 (FIG. 13: S32).

  Thereafter, the CPU 74 measures the first distance l ′ in the same manner as S13 and S14 in FIG. 6 (FIG. 13: S33 and S34).

  As described above, according to this modification, the eyeglass-type display device 1b includes the operation detection unit 81, and the control circuit 72 receives the detection signal from the operation detection unit 81, and then the first line of sight and the second line of sight. By detecting this, it becomes possible to detect a more accurate first gaze and second gaze.

《Fourth modification》
In the third modification, the first mark β2 and the second mark γ2 are described as moving on the back surface P3. However, the present invention is not limited to this, and as shown in FIG. 15, the colors of the first mark β2 and the second mark γ2 may be changed over time. More specifically, the color is changed continuously or discontinuously. In addition, as shown in FIG. 16, the shapes of the first mark β2 and the second mark γ2 may be changed over time. In addition, the density or brightness may be changed for each of the first mark β2 and the second mark γ2. With the display control as described above, it is possible to more effectively prompt the user to pay attention.

<< Appendix 1 >>
In the above description, the predetermined information has been described as the object α obtained from the first image signal obtained from the first camera 61. However, the present invention is not limited thereto, and the predetermined information may be character information (details will be described later) generated by the control circuit 72 as described above. Here, since the generation method of character information is described in detail in, for example, Japanese Patent Application Laid-Open No. 2006-309314, further explanation is omitted here.

<< Appendix 2 >>
In the above description, a plurality of display controls have been described with respect to the first mark and the second mark. Regarding the display control of the first mark and the second mark, at least two kinds of the plurality of display controls may be combined.

<< Appendix 3 >>
6 and 13, the control circuit 72 determines whether or not the detected first line-of-sight vector and second line-of-sight vector remain in the direction of the first mark and the second mark for a certain time or more. When it is determined that the user has stayed, the detected first line-of-sight vector and second line-of-sight vector may be determined to be used for calculating the first distance l ′. As a result, the first distance l ′ can be obtained more accurately.

<< Appendix 4 >>
In the above description, the HMI 71 and the control circuit 72 are described as being provided in the operating device 7 connected to the projection device 4 by wire. However, the present invention is not limited to this, and the HMI 71 and the control circuit 72 may be provided in the projection device 4.

<< Appendix 5 >>
In the above description, the eyepiece optical system 3 has been described as including the HOE 33. However, the eyepiece optical system 3 is not limited to this, and a function equivalent to that of the HOE 33 may be realized by a half mirror instead of the HOE 33.

<< Second Embodiment >>
Next, the eyeglass-type display device 1c according to the second embodiment will be described with reference to FIGS. First, the present glasses-type display device 1c has no structural difference compared to the above-described glasses-type display device 1a, and in addition to the first distance l ′, the distance from the user viewpoint to the first camera 61 in the X-axis direction. The third difference d ′ is calculated in consideration of the third distance d ′. Since there is no other difference, FIGS. 1 to 3 are used in the following description.

<When not considering individual differences>
When the eyeglass-type display device 1c does not consider individual differences, the same processing as that of the eyeglass-type display device 1a described above is performed, and a description thereof is omitted.

《When considering individual differences》
Next, the operation of the control circuit 72 when individual differences are taken into account will be described. In this case, since the viewpoint is not located as designed, it is not preferable to apply the above-described parallax a. Therefore, the control circuit 72 adds to the first distance l ′ according to the procedure of the flowchart of FIG. 17 at a predetermined timing (for example, when the user wears or when the user performs a predetermined operation on the HMI 71). The third distance d ′ is obtained.

  First, in the eyeglass-type display device 1c, the first distance (measured value) l ′ is obtained in the same manner as S11 to S13 in FIG. 6 (FIG. 17: S41 to S43). Thereafter, as shown in FIG. 18, the X-axis direction distance from the obtained position of the intersection H to the first camera 61 is obtained as a third distance (measured value) d '(FIG. 17: S44). Here, the third distance d 'is the distance from the intersection H to the leg of the perpendicular in the perpendicular drawn from the intersection H to the optical axis 61a.

  The CPU 74 stores the first distance l ′ obtained in S43 and the third distance d ′ obtained in S44 in the EEPROM 75 (FIG. 6: S45), and ends the process in FIG.

After the end of FIG. 17, the CPU 74 displays predetermined information on the eyepiece optical system 3 according to the procedure of the flowchart of FIG. 19. Hereinafter, the processing procedure of FIG. 19 will be described in detail. Here, the viewpoint position is at the intersection H as shown in FIG. As apparent from the above, the first distance l ′ from the intersection H to the back surface P3 and the third distance d ′ from the intersection H to the intersection A are stored in the EEPROM 75. In addition, the position of an object α, which will be described later, is set to B for the sake of convenience. Moreover, the distance to the viewpoint with respect to each part of this spectacles type display device 1c is illustrated as follows.
First distance (measured value) l ′ between back surface P3 and intersection H: 26 mm
Third distance from intersection A to intersection H (measured value) d ′: 60 mm

  First, the CPU 74 performs the same processing as S01 to S03 in FIG. 4 (FIG. 19: S51 to S53).

  When it is determined Yes in S53, the CPU 74 performs the same process as S04 in FIG. 4 and determines the display position D of the object α (FIG. 19: S54).

  When it is determined No in S53, the CPU 74 checks whether or not the first distance (measured value) 1 'and the third distance (measured value) d' are stored in the EEPROM 75 (FIG. 19: S55).

  If it is determined No in S55, the CPU 74 determines the display position D in the same manner as S04 in FIG. 4 (FIG. 19: S56).

When determining Yes in S55, the CPU 74 executes S57. In S57, the CPU 74 first reads the first distance (measured value) l ′ and the third distance (measured value) d ′ from the EEPROM 75, and sets l in the above equation (1) to l ′ and d to d ′. To the following formula (3).
a ″ = l ′ × d ′ / L (3)
Further, the CPU 74 substitutes l ′, d ′ and L into the above equation (3) to approximately obtain the parallax a ″ considering individual differences.

  Further, the CPU 74 obtains the position of the point D, translates the position of the obtained point D to the X axis positive direction side by the parallax a ″, and obtains the position of the point E ″ (FIG. 19: S57). Here, in this embodiment, d ′ = 60 mm and l ′ = 26 mm. Further, when L obtained in S52 is 400 mm, a ″ is 3.9 mm.

  After execution of S54, S56, or S57, the CPU 74 executes display control similar to S28 in FIG. 8 (FIG. 19: S58).

"effect"
As described above, according to the glasses-type display device 1c, even if the user's viewpoint position is shifted from the design value in both the X-axis direction and the Y-axis direction due to individual differences, the first distance is obtained by the process of FIG. (Measurement value) l ′ and third distance (measurement value) d ′ are calculated. Then, the process of FIG. 19 calculates the parallax a ″ using the first distance (measured value) l ′ and the third distance (measured value) d ′. By determining the display position based on the parallax a ″. The display position of the predetermined information can be made more preferable corresponding to the viewpoint position of each user.

  The glasses-type display device according to the present invention can superimpose predetermined information at a more appropriate position in the front scene, and is suitable for a wearable computer or the like.

DESCRIPTION OF SYMBOLS 1a, 1b, 1c Glasses type display apparatus 2 Frame 3 Eyepiece optical system 4 Projection apparatus 5 Transparent member 61 1st camera 62 2nd camera 7 Operation device 72 Control circuit 81 Operation detection part

Claims (13)

A frame configured to be worn on the user's face;
A first photographing device provided in the frame so as to photograph the user front;
A projection device provided on the frame so as to be capable of projecting a first light beam representing predetermined information;
The eyepiece optical system provided in the frame so that it can be placed in front of the user's eyes when worn, and when the first light flux from the projection device and the second light flux representing the scenery in front of the user are incident, An eyepiece optical system configured to be able to emit a third light flux on which the predetermined information is superimposed on the scene toward the user's eye;
A control circuit for deriving a distance between the user's eye and the eyepiece optical system as a first distance, and adjusting a position where the predetermined information is superimposed on the scenery based on the derived first distance; equipped with a,
The eyepiece optical system emits a fourth light beam and a fifth light beam representing the first mark and the second mark at the first position and the second position toward the user's eye,
The control circuit detects the user's first line of sight and the second line of sight after emission of the fourth light beam and the fifth light beam, and based on the detected first line of sight and second line of sight, the user's eyes and the eyepiece An eyeglass-type display device for deriving a first distance from an optical system .   In addition to the first distance, the control circuit connects a second distance that is a distance in the optical axis direction between the first imaging device and the user's gazing point, and the first imaging device and the user's eyes. The position where the predetermined information is superimposed on the scenery is adjusted from the angle of the straight line connecting the first photographing device and the gazing point with respect to a straight line and the distance between the first photographing device and the user's eyes. The eyeglass-type display device according to claim 1.   3. The eyeglass-type display device according to claim 1, wherein an optical axis of the first imaging device and a line of sight toward the front of the user are substantially parallel when mounted. The eyepiece optical system emits a sixth light beam representing a third mark toward the user's eye at a third position between the first position and the second position, whereby the mark is moved to the first position. The eyeglass-type display device according to claim 1, which is visually recognized by a user so as to continuously move from a position to the second position via the third position. The eyepiece optical system emits the fourth light beam and fifth light flux representing a first position and / or the second position so as to blink the first mark and / or the second mark, any of claims 1 to 4 Glasses display device according to any. The eyepiece optical system emits the fourth light beam and fifth light beam as the first mark and / or said second mark is moved around the first position and / or the second position, one of the claims 1 to 4 Glasses display device according to any. The ocular optical system, the color of the first marker and / or the second marker emits a fourth light beam and fifth light beam varies with time, the eyeglass-type display device according to claim 1 . The ocular optical system, the shape of the first marks and / or said second mark emits a fourth light beam and fifth light beam varies with time, the eyeglass-type display device according to claim 1 . The glasses-type display device according to any one of claims 1 to 8 , further comprising an operation detection unit configured to be able to detect a predetermined operation by a user after the eyepiece optical system emits the fourth light beam and the fifth light beam. . The control circuit determines whether or not the first line of sight and the second line of sight of the user remain around the first position and the second position for a predetermined time after emission of the fourth light beam and the fifth light beam. or the determining, when it is determined that the remains, for detecting a first line of sight and the second line of sight of the user, the eyeglass-type display apparatus according to any one of claims 1 to 9. The mark is visually recognized by the user so as to continuously move from the first position to the second position via the third position,
The control circuit determines whether or not the first line of sight and the second line of sight of the user remain around the first position and the second position for a predetermined time after emission of the fourth light beam and the fifth light beam. The eyeglass-type display device according to claim 4 , wherein the first line of sight and the second line of sight of the user are detected when it is determined that the user has stayed. The eyeglass-type display device according to claim 1, wherein the control circuit detects an angle of a user's line of sight with respect to a predetermined surface in the eyepiece optical system as a first line of sight and a second line of sight. The control circuit derives a distance between the user's eye and the first imaging device as a third distance, and in addition to the first distance, based on the derived third distance, adjusting the position of predetermined information is superimposed, the eyeglass-type display apparatus according to any one of claims 1 to 12.

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