JP6405878B2 - Display device and control method of display device - Google Patents

Description

  The present invention relates to a display device and a display device control method.

  2. Description of the Related Art A device including a battery is known that includes a spare battery and supplies power from the spare battery when the battery is replaced (for example, see Patent Document 1). Patent Document 1 describes a portable device that includes a main battery and a sub-battery, and supplies power from the sub-battery when the main battery is replaced, as a countermeasure against a line being disconnected due to power problems when the amount of power stored in the battery is small. Disclose phone.

JP-A-8-9002

However, in a device having a relatively large amount of power consumption such as a display device, it is necessary to stop the device when replacing the battery. For example, even if a battery is prepared separately from the main power source as in the sub-battery described in Patent Document 1, increasing the capacity of this type of battery increases the size, weight, and cost. From the viewpoint of etc., it is not realistic. For this reason, it is not practical to cover the power consumption of the display device with the sub-battery or the like while the battery is replaced.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a display device that is driven by a battery and that can replace the battery without stopping the operation of the device, and a control method for the display device. And

In order to achieve the above object, a display device of the present invention is a display device, which allows a user to visually recognize an image and transmits an outside scene, a first battery and a second battery, and a communication unit. And a control unit that switches power between the first battery and the second battery, and the control unit displays the display when the power source is switched from the first battery to the second battery. The operation mode of the apparatus is shifted from the normal operation mode to a battery replacement mode in which power consumption of the display unit and the communication unit is smaller than that of the normal operation mode, and the communication unit can communicate in the battery replacement mode. It is characterized by maintaining the state.
According to the present invention, a plurality of batteries can be used efficiently, and the batteries can be replaced without stopping the operation of the apparatus.

In the display device, the display unit displays a first display unit that displays an image corresponding to the left eye of the user, and a second display unit displays an image corresponding to the right eye of the user. And a display unit, wherein the control unit stops display of either the first display unit or the second display unit in the battery replacement mode.
According to the present invention, the power consumption of the display unit can be reduced, and the second battery can sufficiently supply power during the replacement of the first battery.

In the display device, the control unit may set a frame rate of an image to be displayed on the display unit in the battery replacement mode to be lower than a frame rate of an image to be displayed on the display unit in the normal operation mode. Features.
According to the present invention, power consumption during replacement of the first battery can be further reduced, and power can be supplied by the second battery.

In the display device, the control unit makes a display area of the display unit in the battery replacement mode smaller than a display area of the display unit in the normal operation mode.
According to the present invention, power consumption during replacement of the first battery can be further reduced, and power can be supplied by the second battery.

In the display device, the communication unit may start the communication without performing authentication when the operation mode of the display device shifts from the battery replacement mode to the normal operation mode. The communicable state is maintained in the exchange mode.
According to the present invention, when the operation mode shifts from the battery replacement mode to the normal operation mode, communication can be started without performing authentication.

Further, the display device includes a non-volatile storage unit, and the control unit stores data related to operation of the control unit in the storage unit when the control unit shifts to the battery replacement mode. Is performed based on the data stored in the storage unit when shifting from the battery replacement mode to the normal operation mode.
According to the present invention, when shifting from the battery replacement mode to the normal operation mode, the control unit can be returned to the state before shifting to the battery replacement mode.

In the display device, when the first battery is replaced, the control unit performs display based on the remaining capacity of the first battery after replacement on the display unit.
According to the present invention, the user can check the remaining capacity of the first battery after the replacement of the first battery.

In the display device, the control unit charges the second battery with electric power of the first battery when a remaining capacity of the first battery is equal to or greater than a threshold value. .
According to the present invention, the remaining capacity of the second battery can be maintained in a good state.

Further, in the display device, the control unit causes the display unit to display a display prompting replacement of the first battery when a remaining capacity of the first battery is equal to or less than a threshold value. To do.
According to the present invention, it is possible to notify that the remaining capacity of the first battery is low, and it is possible to prevent problems due to insufficient remaining capacity of the first battery.

The display device may further include a lid that opens and closes a battery housing that detachably houses the first battery, and an open / close detection unit that detects opening and closing of the lid, and the control unit includes the open / close detection unit. When the opening of the lid is detected by the unit, the power source is switched from the first battery to the second battery.
According to the present invention, the power source can be quickly switched to the second battery in response to the operation of replacing the first battery.

The display device control method of the present invention is a display device control method including a display unit that allows a user to visually recognize an image and transmits an outside scene, and a communication unit, and the power source of the display device is a first battery. When the battery is changed from the second battery to the second battery, the operation mode of the display device is changed from the normal operation mode to the battery replacement mode in which the power consumption of the display unit and the communication unit is smaller than the normal operation mode. In the battery exchange mode, the communication unit is maintained in a communicable state.
According to the present invention, a plurality of batteries can be used efficiently, and the batteries can be replaced without stopping the operation of the apparatus.

It is explanatory drawing which shows the external appearance structure of a head mounted type display apparatus. It is a functional block diagram of each part which comprises a head mounted display device. It is a figure which shows the structure of a battery accommodating part. It is a flowchart which shows the process sequence of a control part. It is a flowchart which shows the detailed procedure of battery replacement mode. 6 is a flowchart showing a continuation of the flow of FIG. It is a schematic block diagram which shows the system configuration | structure of a communication system. It is a figure which shows a management table. It is a figure which shows the communication sequence of a head mounting type display apparatus and a server.

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

  The head-mounted display device 100 includes an image display unit 20 that allows a user to visually recognize a virtual image when mounted on the user's head, and a control device 10 that controls the image display unit 20. The control device 10 also functions as a controller for the user to operate the head-mounted display device 100.

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

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

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

The display drive units 22 and 24 include liquid crystal displays 241 and 242 (Liquid Crystal Display, hereinafter also referred to as “LCDs 241 and 242”), projection optical systems 251 and 252 (see FIG. 2). Details of the configuration of the display driving units 22 and 24 will be described later. The optical image display units 26 and 28 as optical members include light guide plates 261 and 262 (see FIG. 2) and a light control plate 20A. The light guide plates 261 and 262 are formed of a light transmissive resin or the like, and guide the image light output from the display driving units 22 and 24 to the user's eyes. The dimming plate 20A is a thin plate-like optical element, and is arranged so as to cover the front side of the image display unit 20 which is the side opposite to the user's eye side. As the light control plate 20A, various ones such as one having almost zero light transmittance, one that is almost transparent, one that attenuates the amount of light and transmits light, and one that attenuates or reflects light of a specific wavelength are used. Can do. By appropriately selecting the optical characteristics (light transmittance, etc.) of the light control plate 20A, the external light amount incident on the right optical image display unit 26 and the left optical image display unit 28 from the outside is adjusted to visually recognize the virtual image. You can adjust the ease. In the present embodiment, a case will be described in which at least a light control plate 20A having such a light transmittance that a user wearing the head-mounted display device 100 can visually recognize an outside scene is used. The light control plate 20A protects the right light guide plate 261 and the left light guide plate 262, and suppresses damage to the right light guide plate 261 and the left light guide plate 262, adhesion of dirt, and the like.
The dimming plate 20A may be detachable from the right optical image display unit 26 and the left optical image display unit 28, or may be mounted by replacing a plurality of types of dimming plates 20A, or may be omitted. .

The camera 61 is disposed at the end ER that is the other end of the right optical image display unit 26. The camera 61 captures an outside scene that is an external scenery in a direction opposite to the user's eye side, and acquires an outside scene image. The camera 61 of this embodiment shown in FIG. 1 is a monocular camera, but may be a stereo camera.
The shooting direction of the camera 61, that is, the angle of view, is taken from the front side direction of the head-mounted display device 100, in other words, at least a part of the outside scene in the user's viewing direction when the head-mounted display device 100 is mounted. Direction. In addition, although the angle of view of the camera 61 can be set as appropriate, the imaging range of the camera 61 is a range including the outside world that the user can visually recognize through the right optical image display unit 26 and the left optical image display unit 28. It is preferable. Furthermore, it is more preferable that the imaging range of the camera 61 is set so that the entire field of view of the user through the light control plate 20A can be photographed.

  The image display unit 20 further includes a connection unit 40 for connecting the image display unit 20 to the control device 10. The connection unit 40 includes a main body cord 48 connected to the control device 10, a right cord 42, a left cord 44, and a connecting member 46. The right cord 42 and the left cord 44 are codes in which the main body cord 48 is branched into two. The right cord 42 is inserted into the casing of the right holding unit 21 from the distal end AP in the extending direction of the right holding unit 21 and connected to the right display driving unit 22. Similarly, the left cord 44 is inserted into the housing of the left holding unit 23 from the distal end AP in the extending direction of the left holding unit 23 and connected to the left display driving unit 24.

  The connecting member 46 is provided at a branch point between the main body cord 48, the right cord 42 and the left cord 44, and has a jack for connecting the earphone plug 30. A right earphone 32 and a left earphone 34 extend from the earphone plug 30. A microphone 63 is provided in the vicinity of the earphone plug 30. The earphone plug 30 to the microphone 63 are combined into one cord, and the cord branches from the microphone 63 and is connected to each of the right earphone 32 and the left earphone 34.

  For example, as shown in FIG. 1, the microphone 63 is arranged such that the sound collection unit of the microphone 63 faces the user's line of sight, collects sound, and outputs a sound signal to the sound processing unit 190. For example, the microphone 63 may be a monaural microphone or a stereo microphone, may be a directional microphone, or may be an omnidirectional microphone.

  It is also possible to combine the right code 42 and the left code 44 into one code. Specifically, the lead wire inside the right cord 42 is drawn into the left holding portion 23 side through the inside of the main body of the image display unit 20, and is covered with a resin together with the lead wire inside the left cord 44 to be combined into one cord. Also good.

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

  The control device 10 is a device for controlling the head-mounted display device 100. The control device 10 includes switches including an enter key 11, a lighting unit 12, a display switching key 13, a luminance switching key 15, a direction key 16, a menu key 17, and a power switch 18. In addition, the control device 10 includes a track pad 14 that is touched by a user with a finger.

  The determination key 11 detects a pressing operation and outputs a signal for determining the content operated by the control device 10. The lighting unit 12 notifies the operation state of the head-mounted display device 100 by its light emission state. Examples of the operating state of the head-mounted display device 100 include power ON / OFF. As the lighting unit 12, for example, an LED (Light Emitting Diode) is used. The display switching key 13 detects a pressing operation and outputs a signal for switching the display mode of the content video between 3D and 2D, for example.

  The track pad 14 detects the operation of the user's finger on the operation surface of the track pad 14 and outputs a signal corresponding to the detected content. As the track pad 14, various track pads such as an electrostatic type, a pressure detection type, and an optical type can be adopted. The luminance switching key 15 detects a pressing operation and outputs a signal for increasing or decreasing the luminance of the image display unit 20. The direction key 16 detects a pressing operation on a key corresponding to the up / down / left / right direction, and outputs a signal corresponding to the detected content. The power switch 18 switches the power-on state of the head-mounted display device 100 by detecting a slide operation of the switch.

FIG. 2 is a functional block diagram of each part constituting the head-mounted display device 100.
As shown in FIG. 2, the head-mounted display device 100 is connected to an external device OA via an interface 125. The interface 125 is an interface for connecting various external devices OA that are content supply sources to the control device 10. As the interface 125, for example, an interface corresponding to a wired connection such as a USB interface, a micro USB interface, or a memory card interface can be used.
The external device OA is used as an image supply device that supplies an image to the head-mounted display device 100. For example, a personal computer (PC), a mobile phone terminal, a game terminal, or the like is used.

  The control device 10 of the head-mounted display device 100 includes a control unit 140, an operation unit 111, an input information acquisition unit 110, a storage unit 120, a transmission unit (Tx) 51, and a transmission unit (Tx) 52. Have.

  The operation unit 111 detects an operation by the user. The operation unit 111 includes the determination key 11, the display switching key 13, the track pad 14, the luminance switching key 15, the direction key 16, the menu key 17, and the power switch 18 illustrated in FIG.

  The input information acquisition unit 110 acquires a signal corresponding to an operation input by the user. As a signal corresponding to the operation input, for example, there are operation inputs to the track pad 14, the direction key 16, and the power switch 18.

  The storage unit 120 is a nonvolatile storage device, and stores various computer programs. The storage unit 120 may store image data to be displayed on the image display unit 20 of the head-mounted display device 100.

  In addition, a three-axis sensor 113, a GPS 115, a communication unit 117, and a voice recognition unit 114 are connected to the control unit 140. The triaxial sensor 113 is a triaxial acceleration sensor, and the control unit 140 can acquire the detection value of the triaxial sensor 113. The GPS 115 includes an antenna (not shown), receives a GPS (Global Positioning System) signal, and obtains the current position of the control device 10. The GPS 115 outputs the current position and the current time obtained based on the GPS signal to the control unit 140. Further, the GPS 115 may have a function of acquiring the current time based on information included in the GPS signal and correcting the time counted by the control unit 140 of the control device 10.

The communication unit 117 is a wireless communication standard such as a wireless LAN (WiFi (registered trademark)), Miracast (registered trademark), Bluetooth (registered trademark), Bluetooth Low Energy, RFID, Felica (registered trademark), or the like. Execute wireless data communication in accordance with the distance wireless communication standard.
When the external device OA is wirelessly connected to the communication unit 117, the control unit 140 acquires content data from the communication unit 117 and performs control for displaying an image on the image display unit 20. On the other hand, when the external device OA is wired to the interface 125, the control unit 140 acquires content data from the interface 125 and performs control for displaying an image on the image display unit 20. Therefore, the communication unit 117 and the interface 125 are hereinafter collectively referred to as a data acquisition unit DA.
The data acquisition unit DA acquires content data from the external device OA. The data acquisition unit DA acquires image data (hereinafter referred to as “display image data”) displayed by the head-mounted display device 100 from the external device OA.

  The voice recognition unit 114 extracts features from digital voice data collected by the microphone 63 and converted into digital data by a voice processing unit 190, which will be described later, and models it. The voice recognition unit 114 extracts and models the features of the voice, recognizes the voices of a plurality of people separately, and recognizes the person who speaks for each voice, or converts the voice into text. Perform text conversion to convert. The voice recognition unit 114 may be configured to identify the language type of the voice data in the voice recognition process.

  The control device 10 includes a first battery 131, a second battery 132, a first battery monitoring IC 133, a second battery monitoring IC 134, a battery control unit 135, and a power supply unit 137.

The first battery 131 is a main battery of the head-mounted display device 100. The first battery 131 is configured using, for example, a secondary battery such as a lithium ion battery, a lithium polymer battery, or a nickel metal hydride battery, a power storage unit such as an electric double layer capacitor, or a primary battery.
The second battery 132 is a sub battery of the head-mounted display device 100. The second battery 132 supplies power to the head-mounted display device 100 when the battery of the first battery 131 is replaced. The second battery 132 is a rechargeable battery, and is charged by the first battery 131 when the first battery 131 is replaced.
The second battery 132 may be a primary battery, but can be charged with a secondary battery such as a lithium ion battery, a lithium polymer battery, or a nickel metal hydride battery, a power storage unit such as an electric double layer capacitor, or a fuel cell. A configuration is preferred. Further, the second battery 132 may be configured to be chargeable by non-contact charging (wireless charging) using an electromagnetic induction method, a radio wave reception method, a resonance method, or the like. Further, a solar cell may be used as the second battery 132.
The head-mounted display device 100 operates using the first battery 131, which is the main battery, as a power source in a normal operation mode to be described later. Further, in the battery exchange mode described later, the second battery 132 that is a sub-battery operates as a power source. Switching between the first battery 131 and the second battery 132 is performed by the control unit 140 as described later.

The first battery monitoring IC 133 is connected to the first battery 131 and the battery control unit 135, and calculates the remaining capacity of the first battery 131. For example, the first battery monitoring IC 133 measures the terminal voltage of the first battery 131 and calculates the remaining capacity of the first battery 131 based on the measured terminal voltage.
The method for calculating the remaining capacity of the first battery 131 by the first battery monitoring IC 133 is to measure and integrate the discharge current of the first battery 131, and based on the accumulated discharge current amount, the remaining capacity of the first battery 131. The capacity may be calculated. Further, the first battery monitoring IC 133 may calculate a remaining capacity of the first battery 131 by measuring a change in impedance of the first battery 131. The first battery monitoring IC 133 outputs the measured terminal voltage of the first battery 131 and the calculated remaining capacity of the first battery 131 to the battery control unit 135.
The first battery monitoring IC 133 may be built in the exterior of the first battery 131 or may be provided integrally with the first battery 131. The first battery 131 includes a battery main body (not shown) in which a secondary battery such as a lithium ion battery, a lithium polymer battery, or a nickel metal hydride battery, or a primary battery is enclosed in a package, and an exterior that houses the battery main body. . Terminals connected to the electrodes inside the package are exposed on the exterior. The first battery monitoring IC 133 may be housed in the exterior together with the battery body. In this case, the first battery monitoring IC 133 is connected to the electrode of the battery body. The terminal on the exterior of the first battery 131 is connected to the output terminal of the first battery monitoring IC 133.

The second battery monitoring IC 134 is connected to the second battery 132 and the battery control unit 135 and calculates the remaining capacity of the second battery 132. Similar to the first battery monitoring IC 133, the second battery monitoring IC 134 measures the terminal voltage of the second battery 132, and calculates the remaining capacity of the second battery 132 based on the measured terminal voltage.
The second battery monitoring IC 134 calculates the remaining capacity of the second battery 132 by measuring and accumulating the discharge current of the second battery 132, and based on the accumulated amount of discharge current. The capacity may be calculated. Further, the second battery monitoring IC 134 may calculate a remaining capacity of the second battery 132 by measuring a change in impedance of the second battery 132. The second battery monitoring IC 134 outputs the measured terminal voltage of the second battery 132 and the calculated remaining capacity of the second battery 132 to the battery control unit 135.
The second battery monitoring IC 134 may be built in the main body of the second battery 132 or may be provided integrally with the second battery 132.

FIG. 3 is a diagram illustrating a configuration of the battery housing part 122. The first battery 131, the second battery 132, the first battery monitoring IC 133, and the second battery monitoring IC 134 are accommodated in the battery accommodating portion 122. The first battery 131 is detachably accommodated in the battery accommodating portion 122. That is, the battery housing part 122 includes a holding part (not shown) that detachably holds the first battery 131.
The battery housing part 122 includes a lid 123. When the lid 123 is opened, the first battery 131 can be taken in and out of the battery housing portion 122.
The battery housing part 122 is provided with an opening / closing detection part 124 that detects opening / closing of the lid 123. Various methods can be adopted for the opening / closing detection unit 124, but in this embodiment, a magnetic detection type opening / closing detection unit 124 is adopted. The open / close detection unit 124 includes a magnet 124A provided on the lid 123 and a Hall element 124B provided on the main body side of the battery housing 122, and detects the magnetic force of the magnet 124A by the Hall element 124B. When the lid 123 is opened and the magnetic force of the magnet 124A cannot be detected by the Hall element 124B, the open / close detection unit 124 outputs a signal indicating that the lid 123 is opened to the control unit 140.
The configuration of the open / close detection unit 124 is not limited to a magnetic detection type configuration including the magnet 124A and the Hall element 124B. For example, you may employ | adopt the switch type structure provided with the toggle switch and lever switch which switch the conduction | electrical_connection state and open state of a contact corresponding to opening and closing of the lid | cover 123. Alternatively, the open / close detection unit 124 may have a light detection type configuration that detects the opening / closing of the lid 123 using light such as infrared rays or visible light, or detects the insertion / extraction of the convex portion into the concave portion. The lid 123 may be detected by opening / closing.

The battery control unit 135 is connected to the control unit 140, the first battery 131, the second battery 132, and the power supply unit 137.
The battery control unit 135 switches the power supply of the head-mounted display device 100 under the control of the control unit 140. That is, the battery control unit 135 switches the battery that supplies power to the head-mounted display device 100 between the first battery 131 and the second battery 132. In addition, power supplied from the first battery 131 or the second battery 132 is input to the battery control unit 135. The battery control unit 135 outputs the input power to the power supply unit 137. In addition, the battery control unit 135 controls a supply destination to which the power supply unit 137 supplies power in accordance with an instruction from the control unit 140.

  The power supply unit 137 is connected to the battery control unit 135. The power supply unit 137 supplies the power supplied from the first battery 131 or the second battery 132 to the supply destination designated by the battery control unit 135. For example, in the normal operation mode described later, the battery control unit 135 instructs the power supply unit 137 to supply power to each unit of the head-mounted display device 100. For this reason, the power supply unit 137 supplies power to each unit of the head-mounted display device 100. Further, in the battery exchange mode described later, power is supplied from the battery control unit 135 to the power supply unit 137 to the control unit 140, the communication unit 117, the right display drive unit 22 and the left display drive unit 24 of the image display unit 20. Is instructed. That is, the power supply unit 137 supplies power to the control unit 140, the communication unit 117, and the right display drive unit 22 and the left display drive unit 24 of the image display unit 20.

  The control unit 140 reads out and executes a computer program stored in the storage unit 120, thereby operating the operating system (OS) 150, the image processing unit 160, the display control unit 170, the power saving control unit 180, and the sound processing unit 190. Function as.

The head-mounted display device 100 includes a normal operation mode and a battery replacement mode as operation modes. The operation mode of the head-mounted display device 100 is switched by the power saving control unit 180.
The normal operation mode is an operation mode in which power is supplied to each unit of the head-mounted display device 100. At least the control unit 140, the communication unit 117, the right display driving unit 22 and the left display driving unit 24 of the image display unit 20 are used. To supply power. In the normal operation mode, power can be supplied to all the functional blocks of the head-mounted display device 100 shown in FIG. However, it is not required that all functional blocks can be energized simultaneously.
The battery replacement mode is an operation mode in which the power consumption of the head-mounted display device 100 is set lower than the normal operation mode under the control of the control unit 140. For example, when the remaining capacity of the first battery 131 becomes equal to or less than a specified value, or when a lid 123 of the battery housing unit 122 described later is opened, the control unit 140 operates the head-mounted display device 100. The mode is changed from the normal operation mode to the battery replacement mode.

In the normal operation mode, the first battery 131 supplies power to each part of the head-mounted display device 100, and in the battery replacement mode, the second battery 132 supplies power to each part of the head-mounted display device 100. To do.
Further, when shifting from the normal operation mode to the battery replacement mode, the system information is stored in the storage unit 120 under the control of the power saving control unit 180. The system information is data for returning the head-mounted display device 100 to the state of the normal operation mode before shifting to the battery replacement mode, and is data related to the operation of the control unit of the control unit 140. The system information includes, for example, data related to the operation of the head-mounted display device 100, such as the display position and display size of an image displayed on the image display unit 20. In the battery replacement mode, power is supplied to limited blocks such as the control unit 140, the communication unit 117, the right display drive unit 22 and the left display drive unit 24 of the image display unit 20 under the control of the power saving control unit 180. Supplied.

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

In addition, when an instruction to convert the frame rate of the image signal is input from the power saving control unit 180, the image processing unit 160 performs a conversion process of converting the frame rate of the image signal.
When an instruction to convert the frame rate is input, the image processing unit 160 receives the image signal, the vertical synchronization signal (VSync), and the horizontal so that the frame rate of the image signal is lower than the frame rate in the normal operation mode. The synchronization signal (HSSync) is converted.
Note that the frame rate of the image signal converted by the image processing unit 160 may be a preset frame rate or may be changed according to an instruction from the power saving control unit 180. Good. For example, the power saving control unit 180 may instruct the image processing unit 160 of a frame rate corresponding to the remaining capacity of the second battery 132. Specifically, the frame rate of the conversion destination is preset in a plurality of stages, the remaining capacity of the second battery 132 is divided into a plurality of stages, and the frame rate is associated with the remaining capacity stage of the second battery 132. A configuration is mentioned. In this configuration, the power saving control unit 180 selects a frame rate corresponding to the capacity of the second battery 132 as a conversion destination frame rate.

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

The display control unit 170 generates control signals for controlling the right display drive unit 22 and the left display drive unit 24. Specifically, the display control unit 170 individually controls driving ON / OFF of the right LCD 241 by the right LCD control unit 211 and driving ON / OFF of the right backlight 221 by the right backlight control unit 201 based on the control signal. . Further, the display control unit 170 individually controls ON / OFF driving of the left LCD 242 by the left LCD control unit 212 and ON / OFF driving of the left backlight 222 by the left backlight control unit 202. Thereby, the display control unit 170 controls the generation and emission of image light by the right display driving unit 22 and the left display driving unit 24, respectively. For example, the display control unit 170 controls the right display drive unit 22 and the left display drive unit 24 with a control signal, and causes both the right display drive unit 22 and the left display drive unit 24 to generate image light. Only the image light is generated. In addition, the display control unit 170 controls the right display drive unit 22 and the left display drive unit 24 according to the control signal so that both the right display drive unit 22 and the left display drive unit 24 do not generate image light. You can also.
Further, the display control unit 170 transmits control signals for the right LCD control unit 211 and the left LCD control unit 212 via the transmission units 51 and 52, respectively. In addition, the display control unit 170 transmits control signals for the right backlight control unit 201 and the left backlight control unit 202, respectively.

  Further, the display control unit 170 reduces the luminance of the right backlight 221 and the left backlight 222 when the operation mode is switched to the battery replacement mode by the power saving control unit 180. The display control unit 170 controls the right backlight control unit 201 and the left backlight control unit 202 according to the control signal, and lowers the luminance of the right backlight 221 and the left backlight 222 than in the normal operation mode. In addition, the display control unit 170 may reduce the luminance of either the right backlight 221 or the left backlight 222 as compared with that in the normal operation mode. Since the luminance of at least one of the right backlight 221 and the left backlight 222 is lower than that in the normal operation mode, the power consumption of the head-mounted display device 100 is reduced.

  The display control unit 170 may reduce the display area of the right LCD 241 and the left LCD 242 when the power saving control unit 180 switches the operation mode from the normal operation mode to the battery replacement mode. The display control unit 170 controls the right LCD control unit 211 and the left LCD control unit 212 according to the control signal, and reduces the display area of the right LCD 241 and the left LCD 242 from the display area in the normal operation mode. By reducing the areas of the right LCD 241 and the left LCD 242 where images are displayed, the power consumption of the head-mounted display device 100 is reduced. Further, the display control unit 170 may reduce the display area of at least one of the right LCD 241 and the left LCD 242 more than the display area in the normal operation mode.

  The display control unit 170 may stop the display of the right display driving unit 22 or the left display driving unit 24 when the operation mode is changed to the battery replacement mode. That is, the display control unit 170 stops the generation of the image light of the right display drive unit 22 or the left display drive unit 24 by turning off the output of the control signal to the right display drive unit 22 or the left display drive unit 24. . Further, the display control unit 170 may control the right display driving unit 22 or the left display driving unit 24 according to the control signal to stop the generation of image light of the right display driving unit 22 or the left display driving unit 24. Further, the right display driving unit 22 or the left display driving unit 24 is stopped by stopping the transmission of the clock signal PCLK, the vertical synchronizing signal VSync, the horizontal synchronizing signal HSync, and the image data Data from the image processing unit 160 to the transmitting unit 51 or 52. The generation of the image light may be stopped.

In addition, the display control unit 170 combines the brightness of the backlights 221 and 222, the reduction of the display area of the LCDs 241 and 242 and the stop of the display of the display driving unit 22 or 24 to reduce the power consumption of the image display unit 20. It may be reduced.
The power saving control unit 180 selects a mode number for designating the display mode of the image display unit 20 according to the remaining capacity of the second battery 132 and notifies the display control unit 170 of the selected mode number.
For example, when the remaining capacity of the second battery 132 becomes 80% or less, for example, the power saving control unit 180 notifies the display control unit 170 of the mode number “1”. The display control unit 170 notified of the mode number “1” controls the right backlight control unit 201 and the left backlight control unit 202 in accordance with the control signal, and the brightness of the right backlight 221 and the left backlight 222 is normally set. Lower than in the operation mode.
Further, when the remaining capacity of the second battery 132 becomes 60% or less, the power saving control unit 180 notifies the display control unit 170 of the mode number “2”. The display control unit 170 notified of the mode number “2” controls the right LCD control unit 211 and the left LCD control unit 212 in accordance with the control signal, so that the display areas of the right LCD 241 and the left LCD 242 are displayed in the normal operation mode. Reduce more than.
Further, when the remaining capacity of the second battery 132 becomes 40% or less, the power saving control unit 180 notifies the display control unit 170 of the mode number “3”. The display control unit 170 notified of the mode number “3” turns off the output of the control signal to the right display drive unit 22 or the left display drive unit 24, and displays the display of the right display drive unit 22 or the left display drive unit 24. Stop.
As a result, display of the display image is stopped in either the right display drive unit 22 or the left display drive unit 24. The other of the right display drive unit 22 and the left display drive unit 24 is in a state where the luminance of the backlight 221 (222) is suppressed and the display area of the LCD 241 (242) is reduced.

The power saving control unit 180 changes the operation mode of the head-mounted display device 100.
The power saving control unit 180 shifts the operation mode of the head-mounted display device 100 from the normal operation mode to the battery replacement mode when a detection signal indicating that the lid 123 is opened by the open / close detection unit 124 is input. Let Further, the power saving control unit 180 normally sets the operation mode of the head-mounted display device 100 when the remaining capacity of the first battery 131 detected by the first battery monitoring IC 133 falls below a threshold value. Transition from the operation mode to the battery replacement mode.

The power saving control unit 180 notifies the display control unit 170 that the lid 123 has been opened when the detection signal indicating that the lid 123 has been opened is input by the open / close detection unit 124 and shifts to the battery replacement mode. To do. The display control unit 170 displays a predetermined message on the image display unit 20. This message is a message notifying the opening of the lid 123 and a message requesting to wait for the removal of the first battery 131 until the preparation is completed.
In addition, when the power saving control unit 180 detects that the remaining capacity of the first battery 131 has dropped below the threshold and shifts to the battery replacement mode, the power saving control unit 180 causes the display control unit 170 to display the first battery 131 of the first battery 131. Notify that the remaining capacity has dropped below the threshold. The display control unit 170 displays a predetermined message on the image display unit 20. This message is a message notifying that the remaining capacity of the first battery 131 has dropped below the threshold value, and a message requesting to wait for the removal of the first battery 131 until preparation is completed.

Further, when the power saving control unit 180 shifts to the battery replacement mode, the power saving control unit 180 stores the system information in the storage unit 120. As described above, the system information is data for returning the head-mounted display device 100 to the normal operation mode before shifting to the battery replacement mode.
Further, when the system information is stored in the storage unit 120, the power saving control unit 180 outputs an instruction to switch the power source from the first battery 131 to the second battery 132 to the battery control unit 135. The battery control unit 135 changes the battery that supplies power from the first battery 131 to the second battery 132 in accordance with an instruction from the power saving control unit 180. Further, when the battery is changed to the second battery 132, the power saving control unit 180 changes the power supply destination to the control unit 140, the communication unit 117, the right display driving unit 22 and the left display of the image display unit 20. An instruction to limit to the drive unit 24 is notified to the battery control unit 135. The battery control unit 135 controls the power supply unit 137 in accordance with an instruction from the power saving control unit 180, and the control unit 140, the communication unit 117, and the image display unit 20 supply destinations to which the power supply unit 137 supplies power. The right display driving unit 22 and the left display driving unit 24 are changed.
Since power is supplied to the communication unit 117 even after the transition to the battery replacement mode, the communication unit 117 maintains the connection with the connected network even after the transition to the battery replacement mode. The communication unit 117 maintains a connection with the network in the battery replacement mode so that communication can be started without performing user authentication when the battery replacement mode is shifted to the normal operation mode. For this reason, after returning from the battery replacement mode to the normal operation mode, it is not necessary to perform an operation such as re-entering authentication information such as a password in order to reconnect to the network. Accordingly, it is possible to reduce the labor of the user due to battery replacement.
Further, when the communication unit 117 is connected to the network by, for example, a wireless LAN, the power saving control unit 180 changes the communication mode of the communication unit 117 to the power save mode when the battery replacement mode is entered. The power consumption of the communication unit 117 is reduced.
Furthermore, when the communication unit 117 performs communication by Bluetooth in the normal operation mode, the power saving control unit 180 may switch the communication unit 117 to communication by Bluetooth Low Energy when the battery replacement mode is entered. Good.
In addition, when the short-range wireless communication conforming to the standards such as RFID and Felica is possible, the power saving control unit 180 changes the communication unit 117 from the communication by the wireless LAN when shifting to the battery replacement mode. You may switch to near field communication.

The power saving control unit 180 detects replacement of the first battery 131 when the power source is switched from the first battery 131 to the second battery 132. That is, the power saving control unit 180 detects that the first battery 131 is removed, and detects that the first battery 131 is attached again.
The power saving control unit 180 determines whether or not the first battery 131 has been replaced based on the terminal voltage of the first battery 131 measured by the first battery monitoring IC 133. When the connection between the first battery 131 and the battery control unit 135 is released, the terminal voltage of the first battery 131 measured by the first battery monitoring IC 133 becomes low level or high impedance. The power saving control unit 180 determines that the first battery 131 is removed from the battery housing unit 122 when the measured terminal voltage of the first battery 131 becomes low level or high impedance. This determination is performed by the power saving control unit 180 comparing the voltage value detected by the battery monitoring IC 133 with a preset reference value of the voltage and determining the magnitude thereof.
Further, when a new first battery 131 is accommodated in the battery accommodating portion 122 and the first battery 131 and the battery control portion 135 are connected, the first battery 131 measured by the first battery monitoring IC 133 is measured. The terminal voltage becomes a voltage within a predetermined range. The power saving control unit 180 determines that the first battery 131 has been replaced when the terminal voltage of the first battery 131 measured by the first battery monitoring IC 133 falls within a predetermined range. Here, the power saving control unit 180 compares the voltage value detected by the battery monitoring IC 133 with a reference value of a preset voltage, and determines its magnitude.

When the power saving control unit 180 detects the replacement of the first battery 131, the capacity of the replaced first battery 131 is determined based on the remaining capacity of the first battery 131 calculated by the first battery monitoring IC 133. It is determined whether or not there is a shortage. If the battery with insufficient capacity is not replaced and connected to the battery control unit 135 again, the head-mounted display device 100 cannot be returned to the normal operation mode. Therefore, the power saving control unit 180 determines whether or not the replaced first battery 131 is in a state of insufficient capacity.
The power saving control unit 180 compares the remaining capacity of the first battery 131 with a threshold value, and determines whether or not the first battery 131 is in a state of insufficient capacity. When it is determined that the first battery 131 is in a state of insufficient capacity, the power saving control unit 180 notifies the display control unit 170 to that effect. The display control unit 170 causes the image display unit 20 to display a display that prompts replacement of the first battery 131. In addition, a display based on the remaining capacity of the first battery 131 after replacement may be displayed on the image display unit 20. The power saving control unit 180 calculates a time during which the head-mounted display device 100 can be driven based on the remaining capacity of the first battery 131 after replacement. The power saving control unit 180 notifies the display control unit 170 of the calculated drivable time and causes the image display unit 20 to display it.

Further, when the power saving control unit 180 determines that the first battery 131 is not in a state of insufficient capacity, the battery that supplies power is changed from the second battery 132 to the first battery 131. The controller 135 is instructed. The battery control unit 135 changes the battery from the second battery 132 to the first battery 131 in accordance with an instruction from the power saving control unit 180. In addition, the power saving control unit 180 instructs the battery control unit 135 to supply power to each unit of the head-mounted display device 100. The battery control unit 135 controls the power supply unit 137 to supply the power of the first battery 131 to each unit of the head-mounted display device 100 in accordance with an instruction from the power saving control unit 180. Thereby, the operation mode of the head-mounted display device 100 is changed from the battery exchange mode to the normal operation mode.
Further, the power saving control unit 180 restores the system information stored in the storage unit 120 by expanding it in a work memory such as a RAM. Thereafter, the control unit 140 executes processing based on the data expanded in the RAM. Thereby, the head-mounted display device 100 is returned to the state before the transition to the battery replacement mode.

  When the power saving control unit 180 determines that the first battery 131 is not in a capacity shortage state, the power saving control unit 180 instructs the battery control unit 135 to calculate the remaining capacity of the second battery 132. The battery control unit 135 causes the second battery monitoring IC 134 to calculate the remaining capacity of the second battery 132, and outputs the calculated remaining capacity information of the second battery 132 to the power saving control unit 180. The power saving control unit 180 determines whether or not the second battery 132 is fully charged based on the input remaining capacity of the second battery 132. When it is determined that the capacity of the second battery 132 is not fully charged but is in a chargeable state, the power saving control unit 180 controls the battery so that the first battery 131 charges the second battery 132. The unit 135 is instructed.

  The audio processing unit 190 acquires an audio signal included in the content, amplifies the acquired audio signal, and a speaker (not shown) in the right earphone 32 and a speaker in the left earphone 34 (not shown) connected to the connecting member 46. (Not shown). For example, when the Dolby (registered trademark) system is adopted, processing on the audio signal is performed, and different sounds with different frequencies or the like are output from the right earphone 32 and the left earphone 34, respectively.

  The image display unit 20 includes an interface 25, a right display drive unit 22, a left display drive unit 24, a right light guide plate 261 as a right optical image display unit 26, and a left light guide plate 262 as a left optical image display unit 28. A camera 61, a vibration sensor 65, and a nine-axis sensor 66.

  The vibration sensor 65 is configured using an acceleration sensor, and is arranged inside the image display unit 20 as shown in FIG. In the example of FIG. 1, the right holding unit 21 is built in the vicinity of the end ER of the right optical image display unit 26. When the user performs an operation of hitting the end ER (knock operation), the vibration sensor 65 detects vibration caused by this operation and outputs the detection result to the control unit 140. Based on the detection result of the vibration sensor 65, the control unit 140 detects a knocking operation by the user.

  The 9-axis sensor 66 is a motion sensor that detects acceleration (3 axes), angular velocity (3 axes), and geomagnetism (3 axes). Since the 9-axis sensor 66 is provided in the image display unit 20, the control unit 140 is used based on the detection value of the 9-axis sensor 66 when the image display unit 20 is worn on the user's head. The movement of the person's head can be detected. Since the orientation of the image display unit 20 is known from the detected movement of the user's head, the control unit 140 can estimate the user's line-of-sight direction.

The interface 25 includes a connector to which the right cord 42 and the left cord 44 are connected. The interface 25 outputs the clock signal PCLK, the vertical synchronization signal VSync, the horizontal synchronization signal HSync, and the image data Data transmitted from the transmission unit 51 to the corresponding reception units (Rx) 53 and 54. Further, the interface 25 outputs a control signal transmitted from the display control unit 170 to the corresponding reception units 53 and 54, the right backlight control unit 201, or the left backlight control unit 202.
The interface 25 is an interface of the camera 61, the vibration sensor 65, and the 9-axis sensor 66. The detection result of vibration by the vibration sensor 65 and the detection result of acceleration (three axes), angular velocity (three axes), and geomagnetism (three axes) by the nine-axis sensor 66 are sent to the control unit 140 of the control device 10 via the interface 25. Sent.

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

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

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

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

FIG. 4 is a flowchart showing a processing procedure of the control unit 140.
The power saving control unit 180 determines whether or not the remaining capacity of the first battery 131 input from the battery control unit 135 is equal to or less than a specified value (step S1). The remaining capacity of the first battery 131 is calculated by the first battery monitoring IC 133 and input to the power saving control unit 180 via the battery control unit 135.
When the determination in step S1 is affirmative (step S1 / YES), the power saving control unit 180 executes the battery replacement mode (step S3). When the determination in step S1 is negative (step S1 / NO), the power saving control unit 180 detects opening / closing of the lid 123 of the battery housing unit 122 based on the output signal of the opening / closing detection unit 124. When the opening / closing detection unit 124 detects the opening of the lid 123, the opening / closing detection unit 124 outputs a signal indicating that the lid 123 has been opened to the control unit 140. The power saving control unit 180 inputs a signal output from the open / close detection unit 124 and determines whether or not the lid 123 is opened. When the power saving control unit 180 determines that the lid 123 is opened (step S2 / YES), the battery saving mode is executed (step S3). When the power saving control unit 180 determines that the lid 123 is closed (step S2 / NO), the power saving control unit 180 returns to the determination of step S1, and the measurement result of the remaining capacity of the first battery 131 is input from the battery control unit 135. Wait until
In the present embodiment, as shown in step S2 of FIG. 4, the operation in which the power saving control unit 180 detects the input signal of the open / close detection unit 124 by flow control will be described, but this is a convenient description. Thus, the present invention is not limited to flow control. For example, a signal (voltage value) output when the open / close detection unit 124 detects the opening of the lid 123 may be input to the control unit 140 as an interrupt signal. In this case, the control unit 140 (power saving control unit 180) executes interrupt control for the input of the open / close detection unit 124, and may make an affirmative determination in step S2 even if other processing is being performed.

5 and 6 are flowcharts showing the detailed procedure of the battery replacement mode.
When shifting to the battery replacement mode (step S11), the power saving control unit 180 notifies the display control unit 170 of the fact. Receiving the notification, the display control unit 170 displays a predetermined message on the image display unit 20 (step S12). This message is a message notifying that the cover 123 of the battery housing part 122 is in an open state. Further, the display control unit 170 may display not only the above message but also other messages. For example, a message instructing to wait for the replacement of the first battery 131 until the battery can be replaced may be displayed on the image display unit 20.

  Next, the power saving control unit 180 stores the system information in the storage unit 120 (step S13). The system information includes, for example, data indicating the processing status of the display image data acquired from the external device OA and displayed on the image display unit 20 or when the display of the display image data on the image display unit 20 is resumed. Contains the necessary data.

  Next, the power saving control unit 180 outputs to the battery control unit 135 an instruction to change the power supply battery, that is, the power source from the first battery 131 to the second battery 132. The battery control unit 135 switches the battery that supplies power from the first battery 131 to the second battery 132 in accordance with an instruction from the power saving control unit 180 (step S14).

  Further, the power saving control unit 180 limits the supply destination of power to the control unit 140, the communication unit 117, and the right display driving unit 22 and the left display driving unit 24 of the image display unit 20. 135 is instructed. The battery control unit 135 controls the power supply unit 137 to supply power to the control device 10. The control unit 140, the communication unit 117, the right display drive unit 22 and the left display drive unit 24 of the image display unit 20. (Step S15). Since power is supplied to the communication unit 117 even after the transition to the battery replacement mode, for example, when the communication unit 117 is connected to the network, the connection with the network can be maintained.

  Next, the power saving control unit 180 instructs the display control unit 170 to change the display mode of the image display unit 20 to a mode for reducing power consumption, and the display control unit 170 controls the display of the image display unit 20. The display mode is changed (step S16). For example, the display control unit 170 stops the display of the right display drive unit 22 or the left display drive unit 24 according to the control signal. Further, the power saving control unit 180 may stop the display by causing the battery control unit 135 to stop power supply to either the right display driving unit 22 or the left display driving unit 24. Thereby, only the right display drive part 22 and the left display drive part 24 will be in the state which displays, The power consumption amount is reduced compared with the case where it displays by both. Further, the display control unit 170 may set the luminance of the right backlight 221 and the left backlight 222 to a lower luminance than that in the normal operation mode by the control signal. Further, when the operation mode is changed to the battery replacement mode, the display control unit 170 may reduce the display area of the right LCD 241 and the left LCD 242 with the control signal as compared with the display area in the normal operation mode.

  Further, the power saving control unit 180 may instruct the image processing unit 160 to lower the frame rate of the image signal than in the normal operation mode when the battery switching mode is entered. Upon receiving an instruction from the power saving control unit 180, the image processing unit 160 receives the image signal, the vertical synchronization signal (VSync), and the horizontal synchronization signal so that the frame rate of the image signal is lower than the frame rate in the normal operation mode. (HSync) conversion is performed. The image signal whose frame rate has been converted by the image processing unit 160 is stored in the DRAM in the storage unit 120 for each frame. The image processing unit 160 transmits the generated clock signal PCLK, vertical synchronization signal VSync, horizontal synchronization signal HSync, and image data Data stored in the DRAM in the storage unit 120 via the transmission units 51 and 52, respectively. . As a result, an image having a lower frame rate than that in the normal operation mode is displayed on the image display unit 20.

In addition, the display control unit 170 may change the display mode of the image display unit 20 according to the mode number notified from the power saving control unit 180. The power saving control unit 180 selects a mode number for designating the display mode of the image display unit 20 according to the remaining capacity of the second battery 132 and notifies the display control unit 170 of the selected mode number.
When the display control unit 170 is notified of the mode number “1” indicating that the remaining capacity of the second battery 132 has decreased to 80% or less from the power saving control unit 180, the display control unit 170 and the left backlight 221. The brightness with 222 is lowered as compared with the normal operation mode. Further, when the display control unit 170 is notified of the mode number “2” indicating that the remaining capacity of the second battery 132 has decreased to 60% or less from the power saving control unit 180, the display control unit 170 displays the right LCD 241 and left LCD 242. The display area is reduced more than the display area in the normal operation mode. Further, when the display control unit 170 is notified of the mode number “3” indicating that the remaining capacity of the second battery 132 has decreased to 40% or less from the power saving control unit 180, the display control unit 170 or the right display driving unit 22 or The display of the left display drive unit 24 is stopped.

  Next, the power saving control unit 180 instructs the display control unit 170 to display a message for prompting battery replacement on the image display unit 20. When the display of either one of the right display drive unit 22 and the left display drive unit 24 is stopped, the display control unit 170 replaces the battery with the display drive unit 22 (24) that has not stopped displaying images. A message for prompting is displayed (step S17).

  Next, the power saving control unit 180 determines whether or not the first battery 131 has been replaced (step S18). The power saving control unit 180 determines whether or not the first battery 131 has been replaced based on the terminal voltage of the first battery 131 measured by the first battery monitoring IC 133 and input from the battery control unit 135. (Step S18). When determining that the first battery 131 has not been replaced (step S18 / NO), the power saving control unit 180 determines whether or not the remaining capacity of the second battery 132 is equal to or less than a specified value (step S18). S19). The remaining capacity of the second battery 132 is calculated by the second battery monitoring IC 134 and input to the control unit 140 via the battery control unit 135. The power saving control unit 180 compares the remaining capacity of the second battery 132 input from the battery control unit 135 with a preset specified value, and the remaining capacity of the second battery 132 is less than the specified value. It is determined whether or not there is (step S19). When the remaining capacity of the second battery 132 is not less than the specified value (step S19 / NO), the power saving control unit 180 returns to the determination of step S17. When the remaining capacity of the second battery 132 is equal to or less than the specified value (step S19 / YES), the power saving control unit 180 executes an end sequence (step S20). When the end sequence is started, the power saving control unit 180 causes the storage unit 120 to store a log regarding the operation state of the control device 10 such as the remaining battery capacity and the date and time, and causes the OS 150 to shut down.

When determining that the first battery 131 has been replaced (step S18 / YES), the power saving control unit 180 inputs the remaining capacity of the replaced first battery 131 from the battery control unit 135. The remaining capacity of the first battery 131 is calculated by the first battery monitoring IC 133. The power saving control unit 180 compares the input remaining capacity of the first battery 131 with a preset specified value, and determines whether or not the remaining capacity of the first battery 131 is greater than or equal to the specified value. (Step S31 in FIG. 6). When the power saving control unit 180 determines that the remaining capacity of the first battery 131 is greater than or equal to the specified value (step S31 / YES), the battery that supplies power is switched from the second battery 132 to the first battery 131. The battery control unit 135 is instructed as follows. In response to an instruction from the power saving control unit 180, the battery control unit 135 changes the battery that supplies power, that is, the power source from the second battery 132 to the first battery 131 (step S36).
The power saving control unit 180 expands and restores the system information stored in the storage unit 120 in step S13 to a work memory such as a RAM (step S37). Thereafter, the control unit 140 executes processing based on the data expanded in the RAM. As a result, the head-mounted display device 100 returns to the state before the transition to the battery replacement mode.

  When the power saving control unit 180 determines that the remaining capacity of the first battery 131 is less than the specified value (step S31 / NO), the power saving control unit 180 controls the display control unit 170 to display a message on the image display unit 20. (Step S32). This message is a message indicating that the remaining battery capacity of the first battery 131 is insufficient. Here, when the display of either one of the right display drive unit 22 and the left display drive unit 24 is stopped, the display control unit 170 displays a message on the other.

  Next, the power saving control unit 180 determines whether or not the first battery 131 has been replaced (step S33). Here, the power saving control unit 180 determines whether or not the first battery 131 has been replaced based on the terminal voltage of the first battery 131 input from the battery control unit 135, as in step S18. . When it is determined that the first battery 131 has been replaced (step S33 / YES), the power saving control unit 180 returns to step S31 and determines whether or not the remaining capacity of the first battery 131 is greater than or equal to a specified value. (Step S31).

  When determining that the first battery 131 has not been replaced (step S33 / NO), the power saving control unit 180 determines whether or not the remaining capacity of the second battery 132 is equal to or less than a specified value. (Step S34). Here, the power saving control unit 180 compares the remaining capacity of the second battery 132 input from the battery control unit 135 with a predetermined value set in advance, and the remaining capacity of the second battery 132 is defined. It is determined whether the value is equal to or less than the value. When the remaining capacity of the second battery 132 is not less than the specified value (step S34 / NO), the power saving control unit 180 returns to the determination of step S34. When the remaining capacity of the second battery 132 is equal to or less than the specified value (step S34 / YES), the power saving control unit 180 executes an end sequence (step S35). When the end sequence is started, the power saving control unit 180 causes the storage unit 120 to store a log regarding the operation state of the control device 10 such as the remaining battery capacity and the date and time, and causes the OS 150 to shut down.

  In step S1, when the remaining capacity of the first battery 131 is larger than the specified value and the lid 123 is accidentally opened, the process may proceed to step S31 when the lid 123 is closed. . In this case, the power saving control unit 180 may determine the remaining capacity of the first battery 131.

[Second Embodiment]
FIG. 7 is a schematic configuration diagram showing a system configuration of the communication system 1 of the present embodiment. The communication system 1 is a system in which a display system 2 including a plurality of head-mounted display devices 100 is connected to a server 5 via a communication network 4.
In FIG. 1, a plurality of head-mounted display devices 100 included in the display system 2 are referred to as head-mounted display devices 100A and 100B, respectively. Hereinafter, when it is not necessary to distinguish between the head-mounted display devices 100 </ b> A and 100 </ b> B, they are referred to as a head-mounted display device 100.

  The communication network 4 is realized by various communication lines such as a public line network, a dedicated line, a wireless communication line including a mobile phone line, and a backbone communication line of these lines, or a combination thereof, and its specific configuration is not limited. The communication network 4 may be a wide area communication line network that can connect remote locations, or may be a LAN (Local Area Network) laid in a specific facility or building. The communication network 4 may include network devices such as a server device, a gateway device, and a router device that connect the various communication lines. Further, the communication network 4 may be composed of a plurality of communication lines.

  The display system 2 is configured using a LAN or the like installed in a building or the like. The display system 2 includes a wireless access point 3 that performs wireless communication, and a plurality of head-mounted display devices 100A and 100B. The wireless access point 3 is a communication device such as an access point or a router, and performs data communication between the head-mounted display device 100A and the head-mounted display device 100B, and the head-mounted display devices 100A and 100B. Relay data communication with the communication network 4.

  The head-mounted display device 100 </ b> A can execute data communication with another head-mounted display device 100 </ b> B via the wireless access point 3. The head-mounted display devices 100 </ b> A and 100 </ b> B execute data communication with the server 5 through the wireless access point 3. Each head-mounted display device 100A may directly perform wireless communication with another head-mounted display device 100B, for example, in an ad hoc mode. The head-mounted display devices 100A and 100B may be connected by a wired communication line. That is, the configuration of the display system 2 is not particularly limited as long as the head-mounted display device 100A can communicate with the head-mounted display device 100B. In addition, the communication system 1 may be configured to be able to communicate with the head-mounted display devices 100 </ b> A and 100 </ b> B included in the display system 2 and the server 5.

This embodiment is an embodiment in which the head-mounted display device 100 is applied for industrial use. In a factory where a plurality of devices are installed, a user wears the head-mounted display device 100 and works using the devices. At this time, the image display unit 20 of the head-mounted display device 100 displays work support information such as a manual for the device used by the user and precautions for using the device as display data. The display data may be provided by the server 5 to the head-mounted display device 100 or may be stored in the storage unit 120 of the head-mounted display device 100. Since the user can operate the device while visually recognizing work support information, the user can operate the device safely and reliably.
In addition, as work support information, an image in which another user is operating the device (hereinafter referred to as an operation image) can be used. A user who provides an operation image, for example, wears the head-mounted display device 100A and shoots the state of operating the device with the camera 61 of the head-mounted display device 100A. The head-mounted display device 100A transmits the operation image photographed by the camera 61 to the head-mounted display device 100B worn by the user who receives the operation image. A user of the head-mounted display device 100B can operate the device while visually recognizing an operation image displayed by the image display unit 20 of the head-mounted display device 100B. Accordingly, the device can be operated safely and reliably.
The operation image may be transmitted directly from the head-mounted display device 100A to the head-mounted display device 100B. Alternatively, the head-mounted display device 100A may upload to the server 5 and download an operation image registered in the server 5 to the head-mounted display device 100B.

The server 5 includes a control unit 6 including a CPU, ROM, RAM, and the like as hardware, and a storage unit 7. The storage unit 7 is a nonvolatile storage device, for example, a semiconductor memory such as a flash memory or an EEPROM, or a portable medium such as a flexible disk, a magnetic disk, a magneto-optical disk, a semiconductor storage device, a ROM, or a CD-ROM. Etc. can be used.
The storage unit 7 stores manuals, precautions, repair book data, operation images, and the like as display data to be displayed on the head-mounted display device 100. The repair document records check items for identifying the cause of the failure when the device has failed, a coping method according to the cause of the failure, and the like.
Further, the storage unit 7 stores system information transmitted from the head-mounted display device 100. The head-mounted display device 100 transmits system information to the server 5 and stores it in the server 5 when the remaining capacity of the first battery 131 decreases to a predetermined value or less.

FIG. 8 shows a management table stored in the storage unit 7.
In the management table, the device ID, account name, authentication information, progress information, and remaining battery capacity are registered. The device ID is information for identifying each head-mounted display device 100A, 100B. The account name is an account name set by a user who is permitted to use the head-mounted display device 100 indicated by the device ID. The authentication information is information such as a password for authenticating the user of the account name. The progress information is information indicating the progress of the work of the account name user. When a plurality of users use one head-mounted display device 100, a plurality of account names, authentication information, and progress information are registered in the same device ID.
The remaining battery capacity is the remaining capacity of the first battery 131 of the head-mounted display device 100 indicated by the device ID. The head-mounted display device 100 notifies the server 5 of the remaining capacity of the first battery 131 at a preset time interval. The server 5 registers the remaining capacity of the first battery 131 notified from the head-mounted display device 100 in the management table in association with the device ID.

FIG. 9 is a diagram illustrating a communication sequence between the head-mounted display device 100 and the server 5.
When the control unit 140 of the head mounted display device 100 is activated when the power is turned on (S101), the control unit 140 transmits a connection request (S102) to the server 5 through wireless communication of the communication unit 117. When receiving the connection request from the head-mounted display device 100, the control unit 6 of the server 5 requests the head-mounted display device 100 to transmit authentication information and authenticates the head-mounted display device 100 (S121). ) The head-mounted display device 100 transmits the account name, password, and device ID to the server 5 in response to a request from the server 5. The control unit 6 authenticates the user with the account name and password received from the head-mounted display device 100. If the user authentication is successful, the control unit 6 connects to the head-mounted display device 100 (S103, S122).

Next, the power saving control unit 180 inputs the remaining capacity of the first battery 131 from the battery control unit 135 (S104). When the remaining capacity of the first battery 131 input from the battery control unit 135 is larger than the specified value, the power saving control unit 180 transmits the remaining capacity of the first battery 131 to the server 5 (S105). The control unit 6 stores the remaining capacity of the first battery 131 notified from the head-mounted display device 100 in the storage unit 7 in association with the device ID (S123). If the remaining capacity of the first battery 131 input from the battery control unit 135 is equal to or less than the specified value, the power saving control unit 180 proceeds to the process of S111 described later.
The power saving control unit 180 transmits the input remaining capacity of the first battery 131 to the server 5 each time the remaining capacity of the first battery 131 is input from the battery control unit 135, and the first The remaining capacity of the battery 131 is updated.
Further, the power saving control unit 180 may transmit the remaining capacity of the first battery 131 to the server 5 even when the remaining capacity of the first battery 131 falls below a specified value.

  Next, the control unit 140 causes the camera 61 to perform shooting and performs marker detection from the captured image of the camera 61 (S106). The marker is, for example, a one-dimensional code such as a barcode, a two-dimensional code such as a QR code (registered trademark), or other markers that can be machine-recognized as an image. For example, the marker is attached to a work place such as a work desk or the vicinity thereof. Since the user needs to cause the camera 61 to photograph the marker or the like, the user is conscious of directing the image display unit 20 in the direction of the marker.

  The control unit 140 analyzes the captured image output from the camera 61 and executes marker detection. When detecting the marker, the control unit 140 transmits the data recorded in the detected marker to the server 5 through the communication unit 117 (S107). The data recorded on the marker is, for example, information for identifying a device. Upon receiving the data transmitted from the head-mounted display device 100 (S124), the control unit 6 transmits display data corresponding to the received data to the head-mounted display device 100 (S125).

  The control unit 140 receives the display data transmitted from the server 5 by the communication unit 117 (S108) and causes the image display unit 20 to display (S109). The user of the head-mounted display device 100 performs the work while visually recognizing the manual of the device that is the work target displayed on the image display unit 20, the precautions when operating the device, and the like. Thereby, errors in work can be reduced.

  When the user completes the work, the user of the head-mounted display device 100 inputs the work content of the finished work by operating the direction key 16 or the track pad 14 of the operation unit 111. The control unit 140 transmits the work content input by the operation unit 111 to the server 5 together with the user's account name. The control unit 6 receives the work content and the account name transmitted from the head-mounted display device 100, and stores them in the storage unit 7 in association with the account name (S126).

  In addition, when the power saving control unit 180 detects that the remaining capacity of the first battery 131 input from the battery control unit 135 has decreased below a predetermined value (S111), the power saving control unit 180 requests the server 5 to transmit a system information. Send. When the power saving control unit 180 receives information permitting transmission of the system information from the server 5, the power saving control unit 180 transmits the system information to the server 5 (S112). The control unit 6 stores the system information received from the head-mounted display device 100 in the storage unit 7 in association with the device ID (S126). When the transmission of the system information to the server 5 is completed, the power saving control unit 180 performs steps S14 to S20 shown in FIG. 5 and steps S31 to S36 shown in FIG. The description of the processing of steps S14 to S20 and the details of the processing of steps S31 to S36 shown in FIG. 6 will be omitted.

  When the replacement of the first battery 131 is detected (S113), the power saving control unit 180 determines whether or not the remaining capacity of the replaced first battery 131 is greater than or equal to a specified value. The power saving control unit 180 switches the battery that supplies power from the second battery 132 to the first battery 131 when the remaining capacity of the replaced first battery 131 is greater than or equal to a specified value. 135 is instructed. When the power source is switched from the second battery 132 to the first battery 131, the power saving control unit 180 transmits a system information acquisition request to the server 5 (S114). When receiving the acquisition request (S128), the control unit 6 transmits the system information of the corresponding device ID to the head-mounted display device 100 (S129). Upon receiving the system information from the server 5 (S115), the head-mounted display device 100 expands the received system information on a work memory such as a RAM (step S116). Thereafter, the control unit 140 executes processing based on the data expanded in the RAM. As a result, the head-mounted display device 100 returns to the state before the transition to the battery replacement mode.

  Note that a work table for replacing the first battery 131 may be installed in the factory, and a device for supplying power to the second battery 132 may be provided on the work table. For example, the workbench is provided with a coil and a device for passing a current through the coil, and the second battery 132 is connected by coupling the magnetic flux generated in the coil to the coil provided in the head-mounted display device 100. Charge. In addition, a device that outputs radio waves used for charging the second battery 132 may be provided on the work table. Further, a resonance (resonance) circuit using a coil or a capacitor may be formed on the work table, and the second battery 132 may be charged by resonating an electric field or a magnetic field. When a solar cell is used as the second battery 132, the second battery 132 may be charged by factory lighting during the replacement operation of the first battery 131.

  As described above, the head-mounted display device 100 according to the embodiment to which the present invention is applied includes the image display unit 20, the first battery 131, the second battery 132, the communication unit 117, and the control unit. 140. The image display unit 20 allows the user to visually recognize the image and transmits the outside scene. The control unit 140 switches the power source between the first battery 131 and the second battery 132. Further, when the power source is switched from the first battery 131 to the second battery 132, the control unit 140 changes the operation mode of the head-mounted display device 100 from the normal operation mode to the image display unit 20 and the communication unit 117. The battery is switched to the battery replacement mode in which the power consumption is lower than that in the normal operation mode. The communication unit 117 maintains a communicable state in the battery replacement mode. Therefore, it is possible to efficiently use a plurality of batteries and replace the batteries without stopping the operation of the apparatus.

  The image display unit 20 includes a left display driving unit 24 that displays an image corresponding to the left eye of the user and a right display driving unit 22 that displays an image corresponding to the right eye of the user. The control unit 140 stops the display of either the left display drive unit 24 or the right display drive unit 22 in the battery replacement mode. Therefore, the power consumption of the image display unit 20 can be reduced, and the second battery 132 can sufficiently supply power during the replacement of the first battery 131.

  Further, the control unit 140 sets the frame rate of the image displayed on the image display unit 20 in the battery replacement mode to be lower than the frame rate of the image displayed on the image display unit 20 in the normal operation mode. Accordingly, power consumption during the replacement of the first battery 131 can be further reduced, and power can be supplied by the second battery 132.

  Further, the control unit 140 makes the display area of the image display unit 20 in the battery replacement mode smaller than the display area of the image display unit 20 in the normal operation mode. Accordingly, power consumption during the replacement of the first battery 131 can be further reduced, and power can be supplied by the second battery 132.

  In addition, the communication unit 117 can communicate in the battery replacement mode so that communication can be started without authentication when the operation mode of the head-mounted display device 100 shifts from the battery replacement mode to the normal operation mode. Maintain a good condition. Therefore, when the operation mode is shifted to the normal operation mode, communication can be started without performing authentication.

  The head-mounted display device 100 includes a nonvolatile storage unit 120. The control unit 140 causes the storage unit 120 to store data related to the operation of the control unit 140 when shifting to the battery replacement mode, and the storage unit when shifting the operation mode from the battery replacement mode to the normal operation mode. The process based on the data stored in 120 is executed. Therefore, when shifting from the battery replacement mode to the normal operation mode, the control unit 140 can be returned to the state before shifting to the battery replacement mode.

  In addition, when the first battery 131 is replaced, the control unit 140 performs display based on the remaining capacity of the first battery 131 after replacement in the image display unit 20. Therefore, after the replacement of the first battery 131, the user can check the remaining capacity of the first battery 131.

  In addition, the control unit 140 charges the second battery 132 with the electric power of the first battery 131 when the remaining capacity of the first battery 131 is equal to or greater than the threshold value. Therefore, the remaining capacity of the second battery 132 can be maintained in a good state.

  In addition, when the remaining capacity of the first battery 131 is equal to or less than the threshold value, the control unit 140 causes the image display unit 20 to display a display prompting the replacement of the first battery 131. Therefore, it is possible to notify that the remaining capacity of the first battery 131 is low, and it is possible to prevent problems due to insufficient remaining capacity of the first battery 131.

  The head-mounted display device 100 includes a lid 123 that opens and closes a battery housing portion 122 that detachably houses the first battery 131 and an open / close detection portion 124 that detects opening and closing of the lid 123. The control unit 140 switches the power source from the first battery 131 to the second battery 132 when the opening / closing detection unit 124 detects the opening of the lid 123. Therefore, the power supply can be quickly switched to the second battery 132 in response to the operation of replacing the first battery 131.

In addition, this invention is not restricted to the structure of the said embodiment, In the range which does not deviate from the summary, it can be implemented in a various aspect.
For example, in the above embodiment, the second battery 132 has been described as being configured to be accommodated in the battery accommodating portion 122 together with the first battery 131, but the present invention is not limited to this, and the second battery 132 is controlled. You may accommodate in the other position inside the apparatus 10. FIG. Further, the second battery 132 may be provided in the image display unit 20 or may be externally connected to the control device 10. In addition, the second battery 132 may be configured to be detachably connected by a connector, or may be configured to be fixedly connected to the battery control unit 135 and not easily detachable. In addition, the specific mounting form of the second battery 132 is arbitrary.

  Further, for example, instead of the image display unit 20, another type of image display unit such as an image display unit worn like a hat may be adopted, and an image is displayed corresponding to the left eye of the user. And a display unit that displays an image corresponding to the right eye of the user. The display device of the present invention may be configured as a head mounted display mounted on a vehicle such as an automobile or an airplane. Moreover, for example, it may be configured as a head-mounted display built in a body protective device such as a helmet, or may be a head-up display (HUD) used for a windshield of an automobile.

Furthermore, in the above embodiment, the image display unit 20 and the control device 10 are separated and connected by way of the connection unit 40, but the control device 10 and the image display unit 20 are integrated. It is also possible to be configured to be mounted on the user's head.
Further, when the control device 10 and the image display unit 20 are connected by a longer cable, a notebook computer, a tablet computer, or a desktop computer may be used as the control device 10. The control device 10 may be a game machine, a portable phone, a portable electronic device including a smartphone or a portable media player, other dedicated devices, or the like. Here, when the control device 10 has a display screen, the display screen included in the control device 10 may be stopped in the battery replacement mode. Further, in the battery replacement mode, any one or more of the display screens of the right display drive unit 22, the left display drive unit 24, and the control device 10 can be displayed and other displays can be stopped. Good.

  For example, as a configuration for generating image light in the image display unit 20, a configuration including an organic EL (Organic Electro-Luminescence) display and an organic EL control unit may be used. Further, as a configuration for generating image light, LCOS (Liquid crystal on silicon, LCoS is a registered trademark), a digital micromirror device, or the like can be used. Further, for example, the present invention can be applied to a laser retinal projection type head mounted display. That is, the image generation unit includes a laser light source and an optical system that guides the laser light source to the user's eye, makes the laser light enter the user's eye, scans the retina, and forms an image on the retina. A configuration that allows the user to visually recognize an image may be employed. When a laser retina projection type head-mounted display is employed, the “image light emitting area in the image light generation unit” can be defined as an image area recognized by the user's eyes.

  As an optical system that guides image light to the user's eyes, an optical member that transmits external light that is incident from the outside toward the apparatus and that enters the user's eyes together with the image light can be employed. Moreover, you may use the optical member which is located ahead of a user's eyes and overlaps a part or all of a user's visual field. Further, a scanning optical system that scans a laser beam or the like to obtain image light may be employed. Further, the optical member is not limited to guiding the image light inside the optical member, and may have only a function of guiding the image light by refracting and / or reflecting it toward the user's eyes.

  Further, the present invention can be applied to a display device that employs a scanning optical system using a MEMS mirror and uses MEMS display technology. That is, as an image display element, a signal light forming unit, a scanning optical system having a MEMS mirror that scans light emitted from the signal light forming unit, and an optical member on which a virtual image is formed by light scanned by the scanning optical system May be provided. In this configuration, the light emitted from the signal light forming unit is reflected by the MEMS mirror, enters the optical member, is guided through the optical member, and reaches the virtual image forming surface. When the MEMS mirror scans the light, a virtual image is formed on the virtual image forming surface, and the user recognizes the virtual image with the eyes, thereby recognizing the image. The optical component in this case may be one that guides light through a plurality of reflections, such as the right light guide plate 261 and the left light guide plate 262 of the above embodiment, and may use a half mirror surface. .

  The display device of the present invention is not limited to a head-mounted display device, and can be applied to various display devices such as a flat panel display and a projector. The display device of the present invention may be any device that allows an image to be visually recognized by external light and image light. For example, a configuration in which an image by image light is visually recognized by an optical member that transmits external light is exemplified. Specifically, the above-described head-mounted display includes an optical member that transmits external light, and a light-transmitting plane or curved surface that is fixedly or movably installed at a position away from the user ( The present invention can also be applied to a display device that projects image light onto glass, transparent plastic, or the like. As an example, a configuration of a display device that projects image light onto a window glass of a vehicle and allows a user who is on board or a user outside the vehicle to visually recognize the scenery inside and outside the vehicle together with an image by the image light. It is done. In addition, for example, image light is projected onto a transparent, semi-transparent, or colored transparent display surface that is fixedly installed such as a window glass of a building, and is displayed together with an image by the image light to a user around the display surface. A configuration of a display device that visually recognizes a scene through the surface can be given.

  In addition, at least a part of each functional block shown in FIG. 2 may be realized by hardware, or may be realized by cooperation of hardware and software, as shown in FIG. It is not limited to a configuration in which independent hardware resources are arranged. Further, the program executed by the control unit 140 may be stored in the storage unit 120 or the storage device in the control device 10, or the program stored in the external device is acquired via the communication unit 117 or the interface 125. It is good also as a structure to execute. Moreover, only the operation part 111 among the structures formed in the control apparatus 10 may be formed as a single user interface (UI). Further, the configuration formed in the control device 10 may be formed in the image display unit 20 in an overlapping manner. For example, the control unit 140 illustrated in FIG. 2 may be formed in both the control device 10 and the image display unit 20, or the control unit 140 formed in the control device 10 and the CPU formed in the image display unit 20. The functions performed by and may be configured separately.

  DESCRIPTION OF SYMBOLS 1 ... Communication system, 2 ... Display system, 3 ... Wireless access point, 4 ... Communication network, 5 ... Server, 6 ... Control part, 7 ... Memory | storage part, 10 ... Control apparatus, 20 ... Image display part (display part), 21 ... Right holding unit, 22 ... Right display driving unit (second display unit), 23 ... Left holding unit, 24 ... Left display driving unit (first display unit), 25 ... Interface, 26 ... Right optical image display , 28 ... Left optical image display unit, 61 ... Camera, 63 ... Microphone, 100 ... Head-mounted display device (display device), 117 ... Communication unit, 120 ... Storage unit, 125 ... Interface, 131 ... First Battery 132 132 Second battery 135 Battery control unit 137 Power supply unit 140 Control unit 150 Operating system 160 Image processing unit 170 Display control unit 180 Power saving Control unit 190 ... Audio processing unit 201 ... Right backlight control unit 202 ... Left backlight control unit 211 ... Right LCD control unit 212 ... Left LCD control unit 221 ... Right backlight 222 ... Left backlight 241 ... right LCD, 242 ... left LCD, 251 ... right projection optical system, 252 ... left projection optical system, 261 ... right light guide plate, 262 ... left light guide plate.

Claims (11)

A display device,
A display unit that allows the user to visually recognize the image and transmit the outside scene;
A first battery and a second battery;
A communication department;
A controller that switches power between the first battery and the second battery;
The display unit includes a first display unit that displays an image corresponding to the left eye of the user, and a second display unit that displays an image corresponding to the right eye of the user,
When the power source is switched from the first battery to the second battery, the control unit changes the operation mode of the display device from the normal operation mode, and the power consumption of the display unit and the communication unit is the normal operation. Move to a battery replacement mode smaller than the mode,
When the remaining capacity of the second battery is less than or equal to a first threshold value, the display brightness of at least one of the first display unit and the second display unit is set to the image brightness in the normal operation mode. Lower than the display brightness,
When the remaining capacity of the second battery is equal to or smaller than a second threshold value smaller than the first threshold value, the size of the display area of the first display unit and the second display unit is set to the normal value. Smaller than the size of the display area in the operation mode,
When the remaining capacity of the second battery is equal to or smaller than a third threshold value smaller than the second threshold value, the display of either the first display unit or the second display unit is stopped. ,
The communication unit maintains a communicable state in the battery replacement mode. The control unit changes the communication method of the communication unit to a communication method with lower power consumption than in the normal operation mode when switching the power source from the first battery to the second battery. The display device according to claim 1. The communication unit performs wireless communication conforming to a wireless LAN standard,
The display device according to claim 2, wherein the control unit causes the communication unit to operate in a power save mode when the operation mode of the display device is shifted to the battery replacement mode. 2. The control unit according to claim 1, wherein a frame rate of an image displayed on the display unit in the battery replacement mode is lower than a frame rate of an image displayed on the display unit in the normal operation mode. 4. The display device according to any one of items 1 to 3 .   The communication unit is capable of the communication in the battery replacement mode so that communication can be started without authentication when the operation mode of the display device shifts from the battery replacement mode to the normal operation mode. The display device according to claim 1, wherein the state is maintained. A non-volatile storage unit;
When the control unit shifts to the battery replacement mode, the control unit stores data related to the operation of the control unit in the storage unit, and when the operation mode shifts from the battery replacement mode to the normal operation mode. 6. The display device according to claim 1, wherein processing based on the data stored in the storage unit is executed.   The said control part performs the display based on the remaining capacity of the said 1st battery after replacement | exchange at the said display part, when the said 1st battery is replaced | exchanged, The any one of Claim 1 to 6 characterized by the above-mentioned. The display device according to one item.   8. The control unit according to claim 1, wherein the control unit charges the second battery with electric power of the first battery when a remaining capacity of the first battery is equal to or greater than a threshold value. The display device according to any one of the above.   The said control part displays the display which prompts replacement | exchange of the said 1st battery on the said display part, when the remaining capacity of the said 1st battery is below a threshold value, The said display part is displayed. The display device according to any one of the above. A lid that opens and closes a battery accommodating portion that detachably accommodates the first battery;
An opening / closing detection unit for detecting opening / closing of the lid,
Wherein, when detecting the opening of the cover by the opening and closing detecting unit switches the power to the second battery from the first battery, any one of claims 1 to 9, characterized in that The display device according to one item. A display unit that allows a user to visually recognize an image and transmits an outside scene, a first battery and a second battery, and a communication unit , the display unit displaying an image corresponding to the left eye of the user a first and a display unit, the control method of the second display section and Ru display device comprising a displaying images corresponding to the right eye of the user to be displayed,
When switching the power source of the display device from the first battery to the second battery, an operation mode of the display device, the normal from the operation mode, the display unit and the power consumption is the normal operating mode of the communication unit To a smaller battery replacement mode,
When the remaining capacity of the second battery is less than or equal to a first threshold value, the display brightness of at least one of the first display unit and the second display unit is set to the image brightness in the normal operation mode. Lower than the display brightness,
When the remaining capacity of the second battery is equal to or smaller than a second threshold value smaller than the first threshold value, the size of the display area of the first display unit and the second display unit is set to the normal value. Change to a size smaller than the size of the display area in the operation mode,
When the remaining capacity of the second battery is equal to or smaller than a third threshold value smaller than the second threshold value, the display of either the first display unit or the second display unit is stopped. ,
A control method for a display device, wherein the communication unit is maintained in a communicable state in the battery replacement mode.

Images