JP2017026885A - Image display device and method of driving image display device - Google Patents

Abstract

An image display device capable of irradiating light over a wide range and a driving method of the image display device are provided. An image display device includes a modulated light generation unit, a scanning unit that scans the modulated light emitted from the modulated light generation unit, and a viewer that receives the modulated light scanned by the scanning unit. And a driving unit 700 that moves the scanning unit 500 in a direction away from the deflection unit 600, and an imaging unit 800 that images the observer's eye EY. The driving unit 700 moves the scanning unit 500 in a direction along the optical axis Loa of the modulated light L scanned by the scanning unit 500. [Selection] Figure 2

Description

  The present invention relates to an image display device and a method for driving the image display device.

  As one of the image display technologies of a head-mounted display (HMD), a display device that irradiates a laser directly on the retina of an eye and visually recognizes an image has recently attracted attention (see, for example, Patent Document 1). In the configuration shown in Patent Document 1, a laser light source, a scanning unit (acousto-optic deflector and galvanometric mirror) that scans laser light emitted from the laser light source, and light scanned by the scanning unit are imaged on the retina. And a lens system.

JP-A-4-100088

  However, since the head-mounted display having such a configuration can irradiate light only to a narrow range of the pupil, it has no other functions other than displaying an image, and is not convenient. is there.

  An object of the present invention is to provide an image display device capable of irradiating light over a wide range and a driving method of the image display device.

Such an object is achieved by the present invention described below.
The image display device of the present invention is an image display device used by being attached to an observer,
A scanning unit that scans light emitted from the light source;
A deflection unit that deflects light emitted from the light source and scanned by the scanning unit toward the eyeball of the observer;
And a drive unit that moves the scanning unit in a direction away from the deflecting unit.
Thereby, since the condensing point of the light deflected by the deflecting unit can be moved, it is possible to irradiate light to a narrow range or irradiate light to a wide range with respect to the eye. In addition to the display function, the lighting function can be exhibited, which is highly convenient.

In the image display device according to the aspect of the invention, it is preferable that the driving unit translates the scanning unit.
Thereby, since the scanning angle of the light (scanning light) scanned by the scanning unit is kept constant, it is possible to irradiate the eye with light regardless of the position of the scanning unit.

In the image display device according to the aspect of the invention, it is preferable that the driving unit moves the scanning unit in a direction along an optical axis of the light scanned by the scanning unit.
Thereby, since the optical axis of the light (scanning light) scanned by the scanning unit is kept constant, it is possible to irradiate the eye with light regardless of the position of the scanning unit.

In the image display device according to the aspect of the invention, when the scanning unit is moved away from the deflection unit by the driving unit, a light condensing point scanned by the scanning unit and deflected by the deflection unit, the deflection unit, It is preferable that the distance is close.
Thus, by separating the scanning unit from the deflecting unit, it is possible to irradiate light over a wide range with respect to the eyeball.

The image display device of the present invention has the light source,
It is preferable that a relative positional relationship between the scanning unit and the light source is fixed.
Thereby, the light emitted from the light source can be reliably incident on the scanning unit regardless of the position of the scanning unit.

In the image display device of the present invention, the scanning unit has a reflecting surface that reflects light emitted from the light source,
The diameter of the light incident on the scanning unit is preferably larger than the diameter of the reflecting surface.

  Thereby, even if the scanning unit moves in the optical axis direction, the light emitted from the light source is not deviated from the reflection surface, and the light emitted from the light source can be scanned by the scanning unit.

In the image display device of the present invention, the image display device has an imaging unit that images the eyeball,
It is preferable that the scanning unit is moved in a direction away from the deflection unit and the eyeball is imaged by the imaging unit.
Thereby, the eyeball can be observed and, for example, iris authentication, blood redness measurement, eye disease examination, and the like can be performed.

In the image display device of the present invention, when the eyeball is imaged by the imaging unit, the scanning unit is preferably moved in a direction away from the deflection unit by the driving unit.
Thereby, light can be irradiated over a wide range with respect to the eyeball, and this light can be used as illumination when the eyeball is imaged by the imaging unit.

The driving method of the image display device of the present invention is a driving method of the image display device used by being attached to an observer,
A scanning unit that scans light emitted from the light source;
Switching between a state in which an image is displayed to the observer and a state in which the eyeball of the observer is illuminated in a wider range than the state in which the image is displayed to the observer.
Thereby, since the condensing point of the light deflected by the deflecting unit can be moved, it is possible to irradiate light to a narrow range or irradiate light to a wide range.

1 is a diagram illustrating a schematic configuration of an image display device according to a first embodiment of the present invention. It is a schematic block diagram of the display unit of the image display apparatus shown in FIG. It is a schematic block diagram of the display unit of the image display apparatus shown in FIG. It is a perspective view of the image display apparatus shown in FIG. It is a figure which shows the modulated light production | generation part with which a display unit is provided. It is a top view which shows the scanning part with which a display unit is provided. It is a top view which shows the drive part with which a display unit is provided. It is a top view which shows the drive part with which a display unit is provided. It is a top view which shows the condensing point which changes with the movement of the scanning part by a drive part. It is a top view which shows the condensing point which changes with the movement of the scanning part by a drive part. It is a figure which shows a pixel. It is a top view which shows the drive part which the image display apparatus which concerns on 2nd Embodiment of this invention has. It is a top view which shows the relationship between the modulated light and the magnitude | size of a mirror of the image display apparatus which concerns on 3rd Embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an image display device of the invention will be described with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a diagram showing a schematic configuration of an image display apparatus according to the first embodiment of the present invention. 2 and 3 are schematic configuration diagrams of the display unit of the image display apparatus shown in FIG. FIG. 4 is a perspective view of the image display apparatus shown in FIG. FIG. 5 is a diagram illustrating a modulated light generation unit included in the display unit. FIG. 6 is a plan view illustrating a scanning unit included in the display unit. FIG. 7 and FIG. 8 are plan views each showing a driving unit provided in the display unit. FIG. 9 and FIG. 10 are plan views showing condensing points that change as the scanning unit moves by the driving unit. FIG. 11 is a diagram illustrating a pixel. In the following, for convenience of explanation, the right side for the observer is also referred to as “right”, the left side is also referred to as “left”, the front (front side) is also referred to as “front”, and the rear (rear side) is also referred to as “rear”. say. In FIG. 1, the right side is “R”, the left side is “L”, the front is “F”, and the rear is “RE”.

  An image display device 100 shown in FIG. 1 is a retinal scanning head-mounted display (head-mounted image display device). Such an image display device 100 has an appearance like glasses, is used by being worn on the head H of the observer, and allows the observer to visually recognize the virtual image superimposed on the external image.

  As shown in FIG. 1, the image display device 100 includes a frame 200 and a display unit 300 supported by the frame 200. The display unit 300 includes a display unit 300A provided for the right eye of the observer and a display unit 300B provided for the left eye of the observer.

  The display units 300A and 300B have the same configuration, and as shown in FIGS. 2 and 3, respectively, the modulated light generation unit 400, the scanning unit 500, the deflection unit 600, the driving unit 700, and the imaging unit. Part 800 and control part 900. In each of such display units 300A and 300B, the modulated light generation unit 400 generates the modulated light L based on the video signal from the control unit 900, and the scanning unit 500 scans the modulated light L two-dimensionally. The deflecting unit 600 is configured to deflect the modulated light L scanned by the scanning unit 500 toward the observer's eye (eyeball) EY, and further, the driving unit 700 moves the scanning unit 500 to thereby deflect the deflecting unit. The condensing point of the modulated light L deflected by 600 can be shifted.

  By having such a display unit 300, an observer can visually recognize an image (virtual image) corresponding to the video signal. Note that the image display device 100 of the present embodiment is a binocular head mounted display, but the image display device 100 may be a monocular head mounted display. That is, a configuration in which one of the display units 300A and 300B is omitted may be employed.

Hereinafter, each component of the image display apparatus 100 will be sequentially described in detail.
(flame)
As shown in FIG. 4, the frame 200 has a shape like a spectacle frame and supports the display units 300A and 300B. The frame 200 includes a front part 210 positioned in front of the observer's eye EY, and a pair of temple parts 220 and 230 extending from both left and right ends of the front part 210.

  The front part 210 has a rim part 211, a shade part 212 and a nose pad 213 supported by the rim part 211. The shade unit 212 has a function of suppressing the transmission of external light and supports the deflecting unit 600. A nose pad 213 is provided at the center of the shade portion 212. When the observer wears the image display device 100 on the head H, the nose pad 213 abuts on the nose NS of the observer and supports the image display device 100 with respect to the head H of the observer.

  The temple parts 220 and 230 are connected to the front part 210. Such temple portions 220 and 230 are straight temple portions that are hardly attached to the observer's ear EA, and when the observer wears the image display device 100 on the head H, the temple portions A part of 220 and 230 is configured to contact the observer's ear EA. The temple portions 220 and 230 may be foldable with respect to the front portion 210 or may not be foldable.

  Although the frame 200 has been described above, the shape of the frame 200 is not limited to the illustrated shape as long as it can be mounted on the head H of the observer and can support the display unit 300.

(Modulated light generator)
The modulated light generation unit 400 of the display unit 300A is arranged in the temple unit 220, and the modulated light generation unit 400 of the display unit 300B is arranged in the temple unit 230. As shown in FIG. 5, the modulated light generation unit 400 includes a light source unit 410 having a plurality of light sources 410R, 410G, and 410B having different wavelengths, and drive circuits 420R, 420G that drive the light sources 410R, 410G, and 410B. 420B, collimator lenses 440R, 440G, and 440B that collimate light emitted from the light sources 410R, 410G, and 410B, a light combining unit 430, and a condensing lens 450.

  The light source 410R is a laser light source that emits red laser light, the light source 410G is a laser light source that emits green laser light, and the light source 410B is a laser light source that emits blue laser light. By using such three colors of light, a full color image can be displayed. Thus, a brighter and clearer image can be displayed by using a laser light source as the light sources 410R, 410G, and 410B. The light sources 410R, 410G, and 410B are not particularly limited, and for example, laser diodes, LEDs, and the like can be used.

  The drive circuit 420R has a function of driving the light source 410R, the drive circuit 420G has a function of driving the light source 410G, and the drive circuit 420B has a function of driving the light source 410B. In addition, driving of the driving circuits 420R, 420G, and 420B is independently controlled by the control unit 900. The three laser beams emitted from the light sources 410R, 410G, and 410B driven by the driving circuits 420R, 420G, and 420B are collimated by the collimator lenses 440R, 440G, and 440B and enter the light combining unit 430, respectively. To do.

  The light combining unit 430 combines the laser beams from the light sources 410R, 410G, and 410B. In the present embodiment, the light combining unit 430 includes two dichroic mirrors 431 and 432. The dichroic mirror 431 has a function of transmitting red light and reflecting green light, and the dichroic mirror 432 has a function of transmitting red light and green light and reflecting blue light. By using such dichroic mirrors 431 and 432, the light of three colors of red light, green light and blue light from the light sources 410R, 410G and 410B is synthesized. At this time, the control unit 900 independently modulates the intensity of the laser light from the light sources 410R, 410G, and 410B to obtain the modulated light L of a predetermined color. Then, the generated modulated light L is changed to a desired NA (numerical aperture) by the condenser lens 450 and then guided to the scanning unit 500.

The modulated light generation unit 400 is disposed in a housing separate from the display unit 300A, and guides the modulated light L to the display unit 300A using an optical fiber or the like. It can also be configured to scan in dimension. In this case, the condenser lens 450 is disposed in the display unit 300A.
The configuration of the modulated light generation unit 400 has been described above, but the configuration of the modulated light generation unit 400 is not limited to the configuration of the present embodiment as long as the modulated light L can be generated.

(Scanning part)
The scanning unit 500 of the display unit 300 </ b> A is disposed in the temple unit 220, and the scanning unit 500 of the display unit 300 </ b> B is disposed in the temple unit 230. Such a scanning unit 500 is an optical scanner that two-dimensionally scans the modulated light L emitted from the modulated light generation unit 400 toward the deflecting unit 600.

  The scanning unit 500 is an optical scanner that can swing about two axes, and as shown in FIG. 6, the movable unit 510 having a mirror 511 and the movable unit 510 can swing (rotate) about an axis J1. The shaft portions 521 and 522 to be supported, the drive frame portion 530 that supports the shaft portions 521 and 522, and the shaft portion 541 that supports the drive frame portion 530 so as to be swingable (turnable) around an axis J2 orthogonal to the axis J1. 542, a frame-like support portion 550 that supports the shaft portions 541 and 542, and the movable portion 510 with respect to the drive frame portion 530 while swinging the drive frame portion 530 about the axis J2 with respect to the support portion 550. Driving means (not shown) that swings around the axis J1. According to such a configuration, since the movable portion 510 swings around both the axes J1 and J2, the modulated light L reflected by the mirror 511 can be scanned two-dimensionally. The scanning unit 500 scans the modulated light L in the left-right direction (horizontal direction) of the frame 200 by swinging around the axis J1, and in the vertical direction (vertical direction) of the frame 200 by swinging around the axis J2. The modulated light L is scanned.

  Thus, by using an optical scanner that can swing around two axes as the scanning unit 500, the configuration and arrangement (particularly alignment) of the scanning unit 500 can be simplified, and the scanning unit 500 can be downsized. Can be achieved.

  Note that the configuration of the scanning unit 500 is not limited to the configuration of the present embodiment as long as the modulated light L can be scanned two-dimensionally. For example, the scanning unit 500 may be configured to include two optical scanners that scan the modulated light L one-dimensionally, or may be configured to use a polygon mirror or a galvanometer mirror instead of the optical scanner. Good.

  Such a scanning unit 500 is located behind the modulated light generation unit 400 (the separation distance between the scanning unit 500 and the deflection unit 600 is farther than the separation distance between the modulation light generation unit 400 and the deflection unit 600). The modulated light L emitted from the modulated light generation unit 400 toward the rear (the free end side of the temple units 220 and 230) enters the mirror 511.

  The scanning unit 500 is arranged with the mirror 511 facing forward (deflection unit 600). With such an arrangement, it is possible to increase the effective scanning angle of the scanning unit 500 (the scanning angle at which the modulated light L can be guided to the deflecting unit 600). Therefore, a clearer image can be generated.

  However, the arrangement and direction of the scanning unit 500 are not particularly limited as long as the modulated light L emitted from the modulated light generation unit 400 can be scanned. In this embodiment, the modulated light L scanned by the scanning unit 500 is directly incident on the deflecting unit 600. For example, the modulated light L scanned by the scanning unit 500 is temporarily used as a mirror or the like. You may comprise so that it may inject into the deflection | deviation part 600 after reflecting with a reflection member. In this case, for example, a clearer image can be displayed by adding optical characteristics to the reflecting member. The optical characteristics are not particularly limited. For example, the optical path length of the modulated light L is corrected so that the diameter (diameter or radius) of the modulated light L becomes equal on the deflection surface of the deflecting unit 600. Is mentioned.

(Deflection part)
The deflection unit 600 of the display unit 300A is provided in the front unit 210, and is arranged to be positioned in front of the viewer's right eye when in use. On the other hand, the deflection unit 600 of the display unit 300B is provided in the front unit 210 and is disposed in front of the left eye of the observer when in use. Such a deflection unit 600 is large enough to cover the viewer's right and left eyes, and directs the modulated light L scanned by the scanning unit 500 toward the viewer's eyes EY as video light. It has the function to make it enter.

  Such a deflection | deviation part 600 is comprised by the hologram element (hologram mirror) which is one of the diffraction gratings, for example. This hologram element is a semi-transmissive film having a property of diffracting light in a specific wavelength band and transmitting light in other wavelength bands. Thereby, the observer can visually recognize the image formed by the video light while visually recognizing the external image. That is, a see-through type head mounted display can be realized. The deflecting unit 600 is not limited to a hologram element, and for example, a half mirror can be used.

(Imaging part)
The imaging unit 800 of the display unit 300A is provided in the front unit 210, and is arranged so as to be able to image the right eye of the observer when in use. On the other hand, the imaging unit 800 of the display unit 300B is provided in the front unit 210, and is arranged so that the left eye of the observer can be imaged when in use. By imaging the eyes of the observer with such an imaging unit 800, iris authentication, blood redness measurement, eye disease examination, and the like can be performed using an image processing technique. The imaging unit 800 is not particularly limited, and for example, a CCD image sensor, a CMOS image sensor, or the like can be used. Further, the use of the imaging unit 800 is not limited to iris authentication, hyperemia measurement, and eye disease examination.

(Drive part)
The drive unit 700 of the display unit 300A is provided in the temple unit 220, and the drive unit 700 of the display unit 300B is provided in the temple unit 230. Such a driving unit 700 has a function of moving the scanning unit 500 in a direction away from the deflection unit 600. Hereinafter, the drive unit 700 will be described in detail.

  As shown in FIG. 7, the driving unit 700 includes a fixing unit 710 fixed to the temple unit 220 (frame 200), a vibrating body 720 disposed on the fixing unit 710, and a rod-like friction fixed to the vibrating body 720. It has a member 730 and a moving body 740 disposed on the friction member 730, and the modulated light generating unit 400 and the scanning unit 500 are fixed to a mounting table 750 fixed to the moving body 740. Further, the vibrating body 720 is a piezoelectric element, and expands and contracts in the axial direction of the friction member 730 when a voltage is applied. The piezoelectric element can change the speed of expansion and contraction (amount of change per unit time) by controlling the voltage applied.

  In such a driving unit 700, the modulated light generation unit 400 and the scanning unit 500 can be moved integrally by moving the moving body 740 along the friction member 730 by vibrating the vibrating body 720. . Specifically, when a voltage is applied to the vibrating body 720 and relatively slowly stretched, and then a reverse voltage is applied to the vibrating body 720 and rapidly contracted, the moving body 740 moves to the tip side (vibration) of the friction member 730. Move to the side away from the body 720). This is because the vibrating body 720 is slowly extended at the time of extension, so that the inertia of the moving body 740 generated at that time is weak, and the friction member 730 and the moving body are caused by the frictional resistance acting between the friction member 730 and the moving body 740. 740 moves in unison with the vibrating body 720 rapidly when contracting, so that the inertia acting on the moving body 740 is strong, and the moving body 740 moves while maintaining almost the same position. This is because only the friction member 730 moves to the base end side (side approaching the vibrating body 720) so as to slide relative to the body 740. On the other hand, when a voltage is applied to the vibrating body 720 and rapidly expanded, and then a reverse voltage is applied to the vibrating body 720 and slowly contracted, the moving body 740 is moved to the proximal side of the friction member 730. Move to. According to such a configuration, the modulated light generation unit 400 and the scanning unit 500 can be moved with a simple configuration.

  Here, as described above, the driving unit 700 moves the modulated light generation unit 400 and the scanning unit 500 integrally, that is, the relative position between the modulated light generation unit 400 and the scanning unit 500 is fixed. As a result, the modulated light L emitted from the modulated light generation unit 400 can be incident on the mirror 511 of the scanning unit 500 regardless of the position of the scanning unit 500. Therefore, it is possible to scan the modulated light L with the scanning unit 500 without affecting the position of the scanning unit 500.

  Here, assuming that the optical axis of the modulated light L scanned by the scanning unit 500 is the optical axis Loa, the driving unit 700 moves the scanning unit 500 to the optical axis Loa (in the stationary state of the scanning unit 500 as shown in FIG. 8). It is moved along the direction A along the optical axis Loa) so as to approach or separate from the deflecting unit 600. Thereby, the separation distance between the deflecting unit 600 and the scanning unit 500 can be changed while keeping the optical axis Loa constant. Therefore, the change of the image position (irradiation position) due to the movement of the scanning unit 500 (image shift with respect to the external image) can be suppressed, and excellent display characteristics can be exhibited.

  The moving direction of the scanning unit 500 is not limited to the optical axis Loa direction, but may be a moving direction in which the scanning unit 500 is moved away from the deflection unit 600 and translated. The translation means that the surface of the mirror 511 is translated when the scanning unit 500 is in a stationary state. Also, when the scanning unit 500 is in a driving state (assuming that the scanning angle is constant), it means that the optical axis at an angle that bisects the scanning angle is translated.

  As shown in FIG. 9, when displaying an image, the distance between the deflecting unit 600 and the scanning unit 500 is Da, and the condensing point Pa of the modulated light L deflected by the deflecting unit 600 is positioned in the pupil. (Hereafter, this state is also referred to as “display mode (display state)”). Therefore, in the display mode, the modulated light L is scanned directly on the eye EY, and the observer can recognize the image. On the other hand, as shown in FIG. 10, when the distance between the deflecting unit 600 and the scanning unit 500 is Db larger than Da, the condensing point Pb of the modulated light L deflected by the deflecting unit 600 is the condensing point. The modulated light L that moves forward (on the deflection unit 600 side) from Pa (pupil) and spreads beyond the condensing point Pb is the entire eye EY (which is wider than the pupil and includes the fundus, iris, etc.) (Hereinafter, this state is also referred to as “illumination mode (illumination state)”). In other words, if the separation distance between the deflecting unit 600 and the scanning unit 500 is Db larger than Da, the condensing point Pb of the modulated light L deflected by the deflecting unit 600 is moved to the deflecting unit 600 from the condensing point Pa (pupil). Get closer.

  Therefore, in the illumination mode, the modulated light L can be used as illumination light when the imaging unit 800 images the eye EY. In addition, what is necessary is just to select as a color of illumination light according to a use, for example, white may be sufficient, and any of red, green, and blue may be sufficient.

  The image display device 100 has been described above. According to such an image display apparatus 100, since the display unit 300A for image display can be used as an observation unit for observing the eye EY, addition of the apparatus configuration is minimized (the driving unit 700 and the imaging unit 800). However, a new function can be added. Further, according to the illumination mode, the modulated light L can be scanned over a range wider than the pupil, so that an image can be visually recognized by an observer regardless of the position of the pupil.

  Next, a usage example of the image display device 100 as described above will be described with an example. In the following, an example of measuring the degree of hyperemia will be described as an example of use of the image display device 100. However, the use method of the image display device 100 is not limited to this, and is also applicable to iris authentication, eye disease diagnosis, and the like. can do.

  First, the display unit 300 enters the illumination mode. Next, the display unit 300 scans the eye EY with the white modulated light L and illuminates the eye EY with the modulated light L. Then, the imaging unit 800 captures the eye EY while the modulated light L illuminates the eye EY. Next, the control unit 900 analyzes the imaging data. Specifically, first, RBG (red blue green) intensity determination is performed for each pixel corresponding to the eye (white eye portion), and if the intensity is R> B or R> G, it is temporarily determined as “red”, otherwise If so, it is temporarily determined as “white” (hereinafter, this determination is also referred to as “temporary determination”). Next, as shown in FIG. 11, when five or more of the eight pixels Px2 adjacent to the one pixel Px1 of interest are “red”, the pixel of interest Px1 is determined to be “red”, The other is determined as “white”. This determination is performed for all the pixels in the region (hereinafter, this determination is also referred to as “re-determination”). Next, when six or more of the eight pixels Px2 adjacent to the pixel of interest Px1 are “white”, the pixel of interest Px1 is determined to be “white”, and the others are “red”. judge. This determination is performed for all the pixels in the region (hereinafter, this determination is also referred to as “final determination”). Next, from the result of this final determination, the ratio of the pixels determined to be “red” with respect to all the pixels in the region (white eye portion) (the degree of hyperemia) is obtained.

  Here, the control unit 900 measures in advance the degree of hyperemia when the observer's eye EY is normal by the same method as described above, and stores the measurement result (reference value). Then, the control unit 900 compares the degree of hyperemia determined above with the stored reference value and determines that the degree of hyperemia is higher than a reference value by a predetermined value or more, and determines otherwise. Determined as “normal (not congested)”. Note that the degree of hyperemia may be determined in a plurality of stages instead of the two-stage determination of “congested” and “normal”.

  When the control unit 900 determines that the blood is full, the display unit 300 enters the display mode and displays an image such as “Eye is full. Prompt. Note that the control unit 900 may not only call attention, but also perform control such as not drawing an image for a certain period of time after calling attention. On the other hand, when the control unit 900 determines “normal”, the display unit 300 enters the display mode and starts (or resumes) image display.

  The measurement level of the hyperemia level is not particularly limited. For example, the hyperemia level is measured once immediately after the image display apparatus 100 is turned on, and this value is stored as a “reference value”. Then, after the image display is started, the degree of hyperemia is measured at a predetermined time interval (for example, one hour interval), and the measured degree of hyperemia is compared with the previously stored reference value. What is necessary is just to determine "normal".

Second Embodiment
FIG. 12 is a plan view showing a drive unit included in the image display apparatus according to the second embodiment of the present invention.

  Hereinafter, the second embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.

  The second embodiment is substantially the same as the first embodiment described above except that the configuration of the display unit (drive unit) is different. In FIG. 12, the same components as those in the above-described embodiment are denoted by the same reference numerals.

  As shown in FIG. 12, the drive unit 700 of the present embodiment includes a rack gear 760 provided on the lower surface of the mounting table 750, a pinion gear 770 that meshes with the rack gear 760 and is supported by the frame 200, and a pinion gear 770. A rotating motor (drive source) 780. In such a configuration, the modulated light generation unit 400 and the scanning unit 500 can be moved integrally along the extending direction of the rack gear 760 by driving the motor 780.

  Also according to the second embodiment, the same effects as those of the first embodiment described above can be exhibited.

<Third Embodiment>
FIG. 13 is a plan view showing the relationship between the modulated light and the size of the mirror in the image display apparatus according to the third embodiment of the present invention.

  Hereinafter, the third embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.

  The third embodiment is substantially the same as the first embodiment described above except that the configuration of the display unit is different. In FIG. 13, the same reference numerals are given to the same components as those in the above-described embodiment.

  In the display unit 300 of the present embodiment, the modulated light generation unit 400 is fixed to the frame 200, and only the scanning unit 500 is moved in the direction of the optical axis Loa by the drive unit 700 as shown in FIG. That is, when the scanning unit 500 is moved by the driving unit 700, the relative positions of the scanning unit 500 and the modulated light generation unit 400 change. In the display unit 300, the diameter R of the modulated light L emitted from the modulated light generation unit 400 and incident on the scanning unit 500 (mirror 511) is a diameter in the case of a circle, and other shapes (elliptical, polygonal) Etc.) is the width of the reflecting surface 511a of the mirror 511 (the width of the reflecting surface viewed from the incident direction of the modulated light L), preferably the maximum width of the reflecting surface 511a (the shape of the reflecting surface 511a). It does not matter)) It is larger than W. Therefore, even if the scanning unit 500 moves in the direction of the optical axis Loa, the mirror 511 is not detached from the modulated light L, and the modulated light L can be scanned by the scanning unit 500.

  Also according to the third embodiment, the same effects as those of the first embodiment described above can be exhibited.

  As described above, the image display device and the driving method of the image display device of the present invention have been described based on the illustrated embodiment, but the present invention is not limited to this. For example, in the image display device of the present invention, the configuration of each unit can be replaced with an arbitrary configuration having the same function, and other arbitrary configurations can be added.

  Further, the image display device of the present invention is not limited to being applied to a glasses-type head mounted display as long as it forms a virtual image as an image visually recognized by an observer. For example, a helmet type or a headset type The present invention can also be applied to a head-mounted display, an image display device that is supported by a body such as an observer's neck and shoulder, and the like. Further, in the above-described embodiment, the case where the entire image display apparatus is mounted on the observer's head has been described as an example. However, the image display apparatus includes a portion mounted on the observer's head and an observer's head. You may have a part with which a part other than a head is mounted | worn or carried.

  In the above-described embodiments, the configuration of the binocular transmissive head mounted display has been representatively described. For example, a non-transmissive head mount in which an outside scene is blocked when the observer wears the head mounted display is used. It may be a display configuration. Further, the image display device of the present invention may include a device for outputting sound such as a speaker or a headphone.

  DESCRIPTION OF SYMBOLS 100 ... Image display apparatus, 200 ... Frame, 210 ... Front part, 211 ... Rim part, 212 ... Shade part, 213 ... Nose pad, 220, 230 ... Temple part, 300, 300A, 300B ... Display unit 400 Modulated light generation unit 410 Light source unit 410B, 410G, 410R Light source 420B 420G 420R Driving circuit 430 Light synthesis unit 431 432 Dichroic mirror 440B, 440G, 440R: collimator lens, 450: condensing lens, 500: scanning unit, 510: movable unit, 511: mirror, 511a: reflecting surface, 521, 522: shaft unit, 530 ...... Drive frame, 541, 542 ... Shaft, 550 ... Support, 600 ... Deflect, 700 ... Drive, 710 ... Fixed 720 ... vibrating member, 730 ... friction member, 740 ... moving body, 750 ... mounting table, 760 ... rack gear, 770 ... pinion gear, 780 ... motor, 800 ... imaging unit, 900 ... ... Control unit, A ... Direction, Da, Db ... Distance, EA ... Ear, EY ... Eye, H ... Head, J1, J2 ... Axis, L ... Modulated light, Loa ... Light Axis, NS: Nose, Pa, Pb ... Focusing point, Px1, Px2 ... Pixel, R ... Diameter, W ... Width

Claims (9)

An image display device used by being attached to an observer,
A scanning unit that scans light emitted from the light source;
A deflection unit that deflects light emitted from the light source and scanned by the scanning unit toward the eyeball of the observer;
An image display device comprising: a drive unit that moves the scanning unit in a direction away from the deflection unit.   The image display apparatus according to claim 1, wherein the driving unit translates the scanning unit.   The image display device according to claim 1, wherein the driving unit moves the scanning unit in a direction along an optical axis of the light scanned by the scanning unit.   2. The distance between the condensing point of light scanned by the scanning unit and deflected by the deflecting unit and the deflecting unit is reduced when the scanning unit is moved in a direction away from the deflecting unit by the driving unit. 4. The image display device according to any one of items 1 to 3. Having the light source,
The image display apparatus according to claim 1, wherein a relative positional relationship between the scanning unit and the light source is fixed. The scanning unit has a reflecting surface that reflects light emitted from the light source,
The image display device according to claim 1, wherein a diameter of the light incident on the scanning unit is larger than a diameter of the reflecting surface. An imaging unit for imaging the eyeball;
The image display device according to claim 1, wherein the scanning unit is moved in a direction away from the deflection unit, and the eyeball is imaged by the imaging unit.   The image display device according to claim 7, wherein when the eyeball is imaged by the imaging unit, the driving unit moves the scanning unit in a direction away from the deflection unit. A method of driving an image display device used by being attached to an observer,
A scanning unit that scans light emitted from the light source;
A method for driving an image display device, wherein a state in which an image is displayed to the observer and a state in which the eyeball of the observer is illuminated in a wider range than the state in which the image is displayed to the observer are switched. .

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