WO2017213165A1 - Dispositif d'affichage et appareil électronique - Google Patents

Dispositif d'affichage et appareil électronique Download PDF

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Publication number
WO2017213165A1
WO2017213165A1 PCT/JP2017/021066 JP2017021066W WO2017213165A1 WO 2017213165 A1 WO2017213165 A1 WO 2017213165A1 JP 2017021066 W JP2017021066 W JP 2017021066W WO 2017213165 A1 WO2017213165 A1 WO 2017213165A1
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WO
WIPO (PCT)
Prior art keywords
display
image
luminance
brightness
outside world
Prior art date
Application number
PCT/JP2017/021066
Other languages
English (en)
Japanese (ja)
Inventor
卓 天野
笠井　一郎
諭 姫田
Original Assignee
コニカミノルタ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Publication of WO2017213165A1 publication Critical patent/WO2017213165A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers

Definitions

  • the present invention relates to a display device and an electronic apparatus provided with a transmissive display.
  • HMD Head mounted display
  • HUD in-vehicle head-up display
  • Patent Document 1 discloses a virtual image display device that has an external light sensor that detects the intensity of external light and changes the transmittance of the optical element based on the output of the external light sensor. According to the technique of Patent Document 1, it is possible to observe an image adjusted according to a change in the brightness of the outside world.
  • Patent Document 1 adjusts the transmittance of the light control plate based on the detection signal from the external light sensor to appropriately shield external light, thereby reducing the contrast of the virtual image formed by the image forming apparatus. This is to prevent difficulty in seeing. Therefore, when the brightness and contrast of the outside world are reduced, the technique of Patent Document 1 cannot cope with it.
  • Patent Document 2 the brighter the external illuminance detected by the illuminance detection means, the wider the luminance interval between the luminance levels, and the darker the external illuminance is, the narrower the luminance interval between the luminance levels.
  • a technique is disclosed in which the luminance of the backlight is determined for each luminance level so that the ratio of the luminance of the light source to the external illuminance is always constant at the same luminance level.
  • the luminance of the backlight can be determined so that the luminance interval between luminance levels becomes narrower as the illuminance of the outside world becomes darker.
  • the technique of Patent Document 2 cannot cope with the problem and remains a problem.
  • the present invention has been made in view of the above circumstances, and includes a transmissive display that can clearly identify and visually recognize the outside world and a display image even when the brightness and contrast of the outside world are reduced. It is an object to provide a display device and an electronic device.
  • a display device reflecting one aspect of the present invention.
  • a transmissive display capable of displaying an image and allowing an observer to visually recognize the outside world together with the displayed image;
  • a display control device for displaying an image on the transmissive display;
  • a brightness sensor that detects the brightness of the outside world that the viewer visually recognizes through the transmissive display, When the maximum brightness of the external environment detected by the brightness sensor is A (cd / m 2 ) and the minimum brightness of the external environment is B (cd / m 2 ), A ⁇ 500 (1) B / A ⁇ ⁇ (2) (However, ⁇ is an arbitrary value) When the brightness of the image displayed on the transmissive display is C (cd / m 2 ), ⁇ ⁇ (B + C) / (A + C) ⁇ 0.9 (3) The brightness of the image displayed on the transmissive display is adjusted so as to satisfy the above condition.
  • a display device and an electronic apparatus including a transmissive display that can clearly identify and visually recognize the outside world and a display image even when the brightness and contrast of the outside world are reduced. it can.
  • HMD head mounted display
  • FIG. 11 is a diagram showing a luminance distribution in a range (regions 37 to 45) through which an X-X line in FIG. 10 passes, where the vertical axis represents the external brightness and the horizontal axis represents the external position. It is a figure which takes the brightness
  • 4 is a flowchart illustrating control performed by a control processing unit 121.
  • FIG. 1 is a perspective view of a head mounted display 100 that is an electronic apparatus according to the present embodiment.
  • FIG. 2 is a front view of the HMD 100 according to the present embodiment.
  • FIG. 3 is a view of the HMD 100 according to the present embodiment as viewed from above.
  • the right side and the left side of the HMD 100 refer to the right side and the left side for the user (observer) wearing the HMD 100.
  • the HMD 100 of this embodiment has a frame 101 as a support member.
  • a frame 101 that is U-shaped when viewed from above has a front part 101a to which two spectacle lenses 102 are attached, and side parts 101b and 101c extending rearward from both ends of the front part 101a.
  • the two spectacle lenses 102 attached to the frame 101 may or may not have refractive power.
  • a cylindrical main body 103 as a support member is fixed to the front portion 101a of the frame 101 on the upper side of the spectacle lens 102 on the right side (which may be on the left side depending on the user's dominant eye).
  • the main body 103 is provided with a display unit 104.
  • a display image / display luminance control unit 121a (see FIG. 6 described later) that controls display of the display unit 104 based on an instruction from the control processing unit 121 described later is disposed. If necessary, a display unit may be arranged in front of both eyes.
  • FIG. 4 is a schematic cross-sectional view showing the configuration of the display unit 104.
  • the display unit 104 as a display device includes an image forming unit 104A and an image display unit 104B.
  • the image forming unit 104A is incorporated in the main body unit 103, and includes a light source 104a, a unidirectional diffuser 104b, a condenser lens 104c, and a display element 104d.
  • the image display unit 104B which is a so-called see-through type display member (transmission type display), is arranged so as to extend downward from the main body unit 103 and in parallel with one eyeglass lens 102 (see FIG. 1). Further, it is generally plate-shaped and has an eyepiece prism 104f, a deflection prism 104g, and a hologram optical element 104h.
  • the light source 104a has a function of illuminating the display element 104d.
  • the light source 104a emits light having a predetermined wavelength width, whereby the image light obtained by illuminating the display element 104d can have a predetermined wavelength width, and the hologram optical element 104h transmits the image light.
  • the peak wavelength for each color of the light source 104a is set in the vicinity of the peak wavelength of the diffraction efficiency of the hologram optical element 104h, so that the light use efficiency is improved.
  • the light source 104a is composed of LEDs that emit RGB light, the cost of the light source 104a can be reduced, and a color image is displayed on the display element 104d when the display element 104d is illuminated. The color image can be visually recognized by the user.
  • each of the RGB LED elements has a narrow emission wavelength width, the use of a plurality of such LED elements enables high color reproducibility and bright image display.
  • the display element 104d displays an image by modulating the light emitted from the light source 104a in accordance with image data, and is configured by a transmissive liquid crystal display element having pixels that serve as light transmitting regions in a matrix. Has been. Note that the display element 104d may be of a reflective type.
  • the eyepiece prism 104f totally reflects the image light from the display element 104d incident through the base end face PL1 by the opposed parallel inner side face PL2 and outer side face PL3, and passes through the hologram optical element 104h to the user's pupil.
  • external light is transmitted and guided to the user's pupil, and is composed of, for example, an acrylic resin together with the deflecting prism 104g.
  • the eyepiece prism 104f and the deflection prism 104g are joined by an adhesive with the hologram optical element 104h sandwiched between inclined surfaces PL4 and PL5 inclined with respect to the inner surface PL2 and the outer surface PL3.
  • the deflection prism 104g is joined to the eyepiece prism 104f, and becomes a substantially parallel flat plate integrated with the eyepiece prism 104f. By joining the deflecting prism 104g to the eyepiece prism 104f, it is possible to prevent distortion in the external image observed by the user through the display unit 104.
  • the hologram optical element 104h diffracts and reflects the image light (light having a wavelength corresponding to the three primary colors) emitted from the display element 104d to guide it to the pupil B ′, and enlarges the image displayed on the display element 104d by the user. It is a volume phase type reflection hologram guided as a virtual image to the pupil.
  • the hologram optical element 104h has, for example, three wavelength ranges of 465 ⁇ 5 nm (B light), 521 ⁇ 5 nm (G light), and 634 ⁇ 5 nm (R light) with a peak wavelength of diffraction efficiency and a wavelength width of half the diffraction efficiency. The light is diffracted (reflected).
  • the peak wavelength of diffraction efficiency is the wavelength at which the diffraction efficiency reaches a peak
  • the wavelength width at half maximum of the diffraction efficiency is the wavelength width at which the diffraction efficiency is at half maximum of the diffraction efficiency peak. is there.
  • the reflection-type hologram optical element 104h has high wavelength selectivity, and only diffracts and reflects light having a wavelength in the above-mentioned wavelength range (near the exposure wavelength).
  • the hologram optical element 104h is transmitted, and a high external light transmittance can be realized.
  • the light emitted from the light source 104a is diffused by the unidirectional diffusion plate 104b, condensed by the condenser lens 104c, and enters the display element 104d.
  • the light incident on the display element 104d is modulated for each pixel based on the image data input from the display image / display luminance control unit 121a as a display control device, and is emitted as image light. As a result, a color image is displayed on the display element 104d.
  • Image light from the display element 104d enters the eyepiece prism 104f from its base end face PL1, is totally reflected a plurality of times by the inner side face PL2 and the outer side face PL3, and enters the hologram optical element 104h.
  • the light incident on the hologram optical element 104h is reflected there, passes through the inner side surface PL2, and reaches the pupil B '.
  • the user can observe an enlarged virtual image of the image displayed on the display element 104d and can visually recognize it as a screen formed on the image display unit 104B.
  • the hologram optical element 104h constitutes a screen, or it can be considered that a screen is formed on the inner surface PL2.
  • “screen” may refer to an image to be displayed.
  • the eyepiece prism 104f, the deflecting prism 104g, and the hologram optical element 104h transmit almost all of the external light, the user can observe an external field image (real image) through them. Therefore, the virtual image of the image displayed on the display element 104d is observed so as to overlap with a part of the external image. In this manner, the user of the HMD 100 can simultaneously observe the image provided from the display element 104d and the external image via the hologram optical element 104h. Note that when the display unit 104 is in the non-display state, the image display unit 104B is transparent, and only the external image can be observed.
  • a display unit is configured by combining a light source, a liquid crystal display element, and an optical system.
  • a self-luminous display element for example, an organic EL display
  • Element for example, an organic EL display
  • a transmissive organic EL display panel having transparency in a non-light emitting state may be used.
  • the right sub-body portion 107 is attached to the right side portion 101b of the frame 101
  • the left sub-body portion 108 is attached to the left side portion 101c of the frame 101.
  • the right sub-main body portion 107 and the left sub-main body portion 108 have an elongated plate shape, and have elongated protrusions 107a and 108a on the inner side, respectively.
  • the right sub-body portion 107 is attached to the frame 101 in a positioned state
  • the elongated protrusion 108 a is attached to the side of the frame 101.
  • the left sub-main body portion 108 is attached to the frame 101 in a positioned state.
  • a temperature sensor 114 and a geomagnetic sensor 109 for detecting geomagnetism see FIG. 6 to be described later
  • a gyro and acceleration sensor 110A for generating an output corresponding to the posture (see FIG. 6 to be described later).
  • a speaker / earphone 111 ⁇ / b> C and a microphone 111 ⁇ / b> B are provided in the left sub-main body 108.
  • the main body 103 is provided with an illuminance sensor 112 (see FIG. 6 described later).
  • the main main body 103 and the right sub main body 107 are connected so as to be able to transmit signals through a wiring HS, and the main main body 103 and the left sub main body 108 are connected so as to be able to transmit signals through a wiring (not shown). Yes.
  • the right sub-main body 107 is connected to the control unit CTU via a cord CD extending from the rear end.
  • a 6-axis sensor in which an angular velocity sensor and an acceleration sensor are integrated may be used.
  • the HMD can be operated by sound based on an output signal generated from the microphone 111B according to the input sound.
  • the main main body 103 and the left sub main body 108 may be configured to be wirelessly connected.
  • the camera 106 provided in the main body 103 serves also as a luminance distribution detection sensor.
  • the camera 106 as the luminance distribution detection sensor preferably has its optical axis facing the line of sight of the user US, and is preferably provided near the eyes of the user US.
  • a luminance distribution detection sensor separate from the camera may be provided.
  • FIG. 5 is a block diagram of main circuits of the HMD 100.
  • the control unit CTU generates a control signal for the display unit 104 and other functional devices, a control processing unit 121, an operation unit 122, a GPS receiving unit 123 that receives radio waves from GPS satellites, and external and data.
  • a communication unit 124 that exchanges information, a storage unit 129 that stores a program, image data, and the like, and a power supply circuit 130 that converts a voltage applied from the battery 127 into an appropriate voltage for each unit.
  • the control processing unit 121 having the display image / display luminance control unit 121a and the luminance distribution data detection processing unit 121b can use an application processor used in a smartphone or the like, but the type of the control processing unit 121 is not limited. . For example, if an application processor includes hardware necessary for image processing such as GPU or Codec as a standard, it can be said that the processor is suitable for a small HMD.
  • the control processing unit 121 receives the signal. For example, when the user US moves his / her hand or finger in front of his / her eyes, the proximity sensor 105 outputs a signal accordingly. Therefore, so-called gesture detection can be performed using the output signal.
  • the control processing unit 121 receives power from the power supply circuit 130, operates in accordance with a program stored in the storage unit 129, and inputs image data from the camera 106 in accordance with an operation input such as power-on from the operation unit 122.
  • the data can be stored in the storage unit 129 and communicated with the outside via the communication unit 124 as necessary.
  • the control processing unit 121 executes control according to the output from the proximity sensor 105, the user can perform screen control of the HMD 100 or execute an application by a gesture operation using a hand or a finger. it can. Examples of screen control include page turning, scrolling, selection, and determination.
  • FIG. 6 is a front view when the user US wears the HMD 100 of the present embodiment.
  • the range indicated by the alternate long and short dash line is the display area DP for displaying an image
  • the range indicated by the dotted line is the detection area DT that can be detected by the camera 106.
  • the display area DP and the detection area DT overlap.
  • control processing unit 121 divides the display area DP into seven rows and nine columns at equal intervals, and assigns numbers in ascending order from the upper left to the right.
  • FIG. 7 schematically shows such a display area DP, but the ruled lines and area numbers of the display area DP are shown for easy understanding and are actually visually recognized by the user US. is not.
  • the brightness distribution data detection processing unit 121b can acquire the brightness of the outside world corresponding to the divided areas.
  • FIG. 8A is a diagram illustrating an external scene viewed by the user US via the display area DP
  • FIG. 8B is an example of an image IMG displayed on the display area DP by the image forming unit 104A.
  • FIG. FIG. 9 is a diagram illustrating a state in which FIGS. 8A and 8B are overlapped, that is, the image IMG displayed by the image forming unit 104A is visually recognized by the right eye EY of the user US together with the scenery of the outside world. Indicates the state.
  • control processing unit 121 performs the following processing.
  • the luminance distribution data detection processing unit 121b of the control processing unit 121 receives the image signal from the camera 106 and detects the luminance distribution data.
  • the luminance value can be obtained corresponding to each area.
  • an adjustment area for adjusting the luminance is defined, the luminance value can be obtained within that area. It ’s fine.
  • the luminance distribution data detection processing unit 121b only needs to obtain the maximum luminance value and the minimum luminance value by processing the image signal from the camera 106.
  • the camera 106 and the luminance distribution data detection processing unit 121b constitute a luminance sensor.
  • FIG. 10 is a diagram in which the image IMG displayed by the image forming unit 104A and the scenery of the outside world are superimposed on the divided area of the display area DP.
  • FIG. 11 is a diagram showing the brightness of the outside world on the vertical axis and the position of the outside world on the horizontal axis in the range (division areas 37 to 45) through which the XX line of FIG. 10 passes.
  • the divided areas 37 to 45 are selected as the adjustment areas for adjusting the luminance, and the maximum luminance value and the minimum luminance value are set for each divided area based on the pixel value of the image sensor of the camera 106. Looking for.
  • the minimum luminance distribution and the maximum luminance distribution of the outside world in the range of the divided regions 37 to 45 are shown by graphs.
  • the display image / display brightness control unit 121a ⁇ ⁇ (B + C) / (A + C) ⁇ 0.9 (3)
  • the luminance of the image displayed in the divided areas 37 to 45 is set to C (cd / m 2 ) so as to satisfy the condition, and an adjustment signal is transmitted to the image forming unit 104A.
  • the image forming unit 104A emits image light whose display luminance is adjusted, for example, by changing the light emission intensity of the backlight LED.
  • the display image / display brightness control unit 121a may include a calculation circuit for calculation.
  • C 350 (cd / m 2 ).
  • the above is an example in which common luminance adjustment is performed for each row.
  • the present invention is not limited to this, and common luminance adjustment may be performed for each column.
  • the minimum luminance value and the maximum luminance value are obtained in each divided area, and further, the minimum luminance value and the maximum luminance value in the entire display area DP are obtained, and the expression (3) is obtained.
  • adjustment may be performed using the obtained value C as a uniform common value in all divided regions.
  • step S101 the luminance distribution data detection processing unit 121b inputs an image signal from the camera 106 as a luminance distribution detection sensor, and corresponds to the divided areas 1 to 63 in the external environment. The brightness distribution data of is detected.
  • step S102, N 1, and in step S103, the display image / display luminance control unit 121a determines whether or not the maximum luminance value A of the divided region N is 500 (cd / m 2 ) or less.
  • the display image can be clearly distinguished from the scenery of the outside world regardless of the display luminance, and the process proceeds to step S106.
  • the display image / display brightness control unit 121a does not adjust the brightness of the divided region N, that is, uses a reference brightness value.
  • the process proceeds to step S104, and the display image / display luminance control unit 121a is the minimum area (minimum). It is determined whether (luminance value B) / (maximum luminance value A) is 0.7 or more. If (minimum luminance value B) / (maximum luminance value A) is determined to be less than 0.7 in the divided area N, the display image can be clearly distinguished from the scenery of the outside world regardless of the display luminance.
  • the display image / display brightness control unit 121a does not adjust the brightness of the divided area N, that is, uses the reference brightness value.
  • the display image / display luminance control unit 121a determines that 0.7 or more in step S105.
  • the display luminance C is set so as to satisfy ⁇ (B + C) / (A + C) ⁇ 0.9.
  • the user US may arbitrarily specify a divided area for brightness adjustment in the display area DP using the operation unit 122 or the like.
  • the divided areas 24, 25, 33, 34, 42, and 43 indicated by hatching are designated as the first adjustment area for performing the brightness adjustment, and the second adjustment area for performing the brightness adjustment is designated.
  • the divided areas 29 to 32 and 38 to 41 indicated by different hatching are designated.
  • the divided areas to be specified need not be continuous, and discontinuous divided areas may be designated by numbers.
  • the number of divisions of the display area DP is not limited to 63, and may be smaller or larger. Further, when there is an extremely high luminance division region or an extremely low luminance division region in the designated division region, the luminance adjustment of the division region may not be performed.
  • the present invention is not limited to the embodiments described in the specification, and other embodiments and modifications are included for those skilled in the art from the embodiments and technical ideas described in the present specification. it is obvious.
  • the description and the embodiments are for illustrative purposes only, and the scope of the present invention is indicated by the following claims.
  • the present invention has been described by taking the HMD as an example.
  • the present invention is not limited to the HMD, and the present invention is not limited to an HUD for an airplane or a vehicle, and an electronic device such as an advertising panel attached to glass. It is applicable to.
  • the information displayed on the transmissive display may be a menu that can be selected by a gesture operation.
  • HMD Head Mount Display
  • Frame 101a Front part 101b Side part 101c Side part 101d Long hole 101e Long hole 102 Eyeglass lens 103 Main body part 104
  • Display unit 104A Image forming part 104B Image display part 104DR Display control part 104a Light source 104b Unidirectional diffuser 104c Condensing lens 104d Display element 104f Eyepiece prism 104g Deflection prism 104h Hologram optical element 105 Proximity sensor 106 Camera 107 Right sub body 107a Protrusion 108 Left sub body 108a Protrusion 109 Geomagnetic sensor 110A Gyro & acceleration sensor 111B Microphone 111C Speaker / Earphone 112 Illuminance sensor 114 Temperature sensor 121 Control processing unit 121a Display image / display luminance control unit 121b luminance distribution data detection processing unit 122 operation unit 123 GPS reception unit 124 communication unit 127 battery 129 storage unit 130 power supply circuit B ′ pupil CD code CTU control unit DP display area DT detection area EY

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

Cette invention concerne un appareil électronique et un dispositif d'affichage doté d'un affichage de type à transmission permettant de distinguer et de reconnaître clairement un environnement externe et une image d'affichage même lorsque la luminance ou le contraste de l'environnement externe est réduit. Un dispositif de commande d'affichage dans le dispositif d'affichage selon l'invention ajuste la luminance d'une image affichée dans l'affichage du type à transmission de sorte que lorsque A ≤ 500 (1) et B/A ≥ α (2) sont satisfaits (où α est une valeur arbitraire), A (cd/m2) étant la luminance maximale de l'environnement externe et B (cd/m2) étant la luminance minimale de l'environnement externe détectées par un capteur de luminance, l'expression α < (B + C)/(A + C) ≤ 0,9 (3) est satisfaite, C(cd/m2) étant la luminance de l'image affichée dans l'affichage de type à transmission.
PCT/JP2017/021066 2016-06-10 2017-06-07 Dispositif d'affichage et appareil électronique WO2017213165A1 (fr)

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JP2016115971 2016-06-10

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006154437A (ja) * 2004-11-30 2006-06-15 Konica Minolta Photo Imaging Inc 映像表示装置
JP2008083290A (ja) * 2006-09-27 2008-04-10 Sony Corp 表示装置、表示方法
JP2011085829A (ja) * 2009-10-19 2011-04-28 Nikon Corp ヘッドマウントディスプレイ
JP2013048358A (ja) * 2011-08-29 2013-03-07 Canon Inc 視聴システム及びその制御方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006154437A (ja) * 2004-11-30 2006-06-15 Konica Minolta Photo Imaging Inc 映像表示装置
JP2008083290A (ja) * 2006-09-27 2008-04-10 Sony Corp 表示装置、表示方法
JP2011085829A (ja) * 2009-10-19 2011-04-28 Nikon Corp ヘッドマウントディスプレイ
JP2013048358A (ja) * 2011-08-29 2013-03-07 Canon Inc 視聴システム及びその制御方法

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