Head-mounted display device

Abstract

An output unit 12 outputs content for realizing VR on the basis of data acquired by an acquisition unit 11. A detection unit 13 attempts to detect an action that has been intentionally performed by a user in order to reduce the fatigue of eyes viewing an image displayed by a display unit 121. When an action that has been intentionally performed by the user in order to reduce the fatigue of the eyes is detected, a reduction unit 14 performs an operation for reducing the fatigue of the eyes. For example, the reduction unit 14 starts the supply of an electric current through a heating wire 141, and stops the supply of the electric current through the heating wire 141 when the temperature of a thermistor reaches a set temperature.

Description

head-mounted display device

[0001] The present invention relates to a technique for detecting and reducing eye fatigue of a user in a head-mounted display device.

[0002] Head-mounted display devices that realize virtual reality (VR) are becoming increasingly popular, and as a result, an increasing number of users are enjoying content such as computer games that use VR. In particular, some users who enjoy content such as the Metaverse are seen wearing head-mounted display devices and becoming engrossed in the content for long periods of time.

[0003] In order to achieve a sense of immersion, head-mounted display devices have a display that is fixed in front of the user's eyes. As a result, as long as the user wears the head-mounted display device, they must continue to look directly at the display light. This is likely to increase the strain on the user's eyes, and it is predicted that the number of users who experience eye fatigue (also known as eye strain) will increase dramatically.

[0004] For example, Patent Literature 1 discloses that when it is determined that the angular velocity of the eyeball of a viewer viewing a moving image is equal to or greater than the lower limit of the angular velocity of the eyeball in saccadic eye movement, the display of the moving image is stopped in order to reduce eye fatigue. Such an increase in angular velocity of the eyeball is a phenomenon that occurs unconsciously by the user.

[0005] JP 2016-218425 A

[0006] In view of the above background, an object of the present invention is to detect and further reduce eye fatigue of a user viewing an image on a head-mounted display device using a method different from conventional methods.

[0007] In order to solve the above problems, the present invention provides a head-mounted display device comprising a display unit that displays an image, and a detection unit that detects an action taken by a user of their own volition to reduce eye fatigue caused by viewing the image displayed by the display unit. This head-mounted display device may further comprise a reduction unit that performs an operation to reduce eye fatigue when the action to reduce eye fatigue is detected by the detection unit.

[0008] According to the present invention, it is possible to detect and further reduce eye fatigue of a user viewing an image on a head-mounted display device using a method different from conventional methods.

[0009] Fig. 1 is a block diagram showing an example of a hardware configuration of a head mounted display device 10 according to an embodiment of the present invention. Fig. 2 is a block diagram showing an example of a functional configuration of the head mounted display device 10. Fig. 3 is a diagram showing an example of the appearance of the head mounted display device 10. Fig. 4 is a diagram illustrating an example of data stored in the head mounted display device 10. Fig. 5 is a flowchart showing an example of the operation of the head mounted display device 10. Fig. 6 is a diagram illustrating an example of data stored in the head mounted display device 10 according to a modified example. Fig. 7 is a diagram illustrating an example of data stored in the head mounted display device 10 according to a modified example.

[0010] [Embodiment] [Configuration] FIG. 1 is a diagram showing the hardware configuration of a head-mounted display device 10 according to an embodiment of the present invention. The head-mounted display device 10 is physically configured as a computer including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an operation device 1005, a sensor group 1006, a display device 1007, a sound output device 1008, an eye fatigue reduction mechanism 1009, and a bus connecting these components. Each of these components operates using power supplied from a battery (not shown). In the following description, the term "device" may be interpreted as a circuit, device, unit, or the like. The hardware configuration of the head-mounted display device 10 may be configured to include one or more of the components shown in FIG. 1 , or may be configured without including some of the components. Furthermore, the head-mounted display device 10 may be configured by communicating and connecting multiple components each having a different housing.

[0011] Each function of the head-mounted display device 10 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and storage 1003.

[0012] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. Furthermore, for example, a baseband signal processing unit, a call processing unit, etc. may be realized by the processor 1001.

[0013] The processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The program used is a program that causes a computer to execute at least some of the operations described below. The functional blocks of the head-mounted display device 10 may be realized by a control program stored in the memory 1002 and running on the processor 1001. Various processes may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted to the head-mounted display device 10 via a telecommunications line.

[0014] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the method according to this embodiment.

[0015] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. Storage 1003 may also be called an auxiliary storage device.

[0016] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0017] The operation device 1005 is a device that accepts user operations, and is, for example, a key, a switch, a button, a lever, a microphone, or the like.

[0018] The sensor group 1006 is a device that detects actions intentionally performed by the user in order to reduce eye fatigue of the user viewing images displayed by the head-mounted display device 10. The sensor group 1006 in this embodiment includes, for example, a strain sensor, a proximity sensor, an acceleration sensor, and a gyro sensor.

[0019] The display device 1007 is a device that displays an image, such as a display.

[0020] The sound output device 1008 is a device that outputs sound, such as a speaker. The operation device 1005 and the display device 1007 may be integrated into one unit (such as a touch screen).

[0021] The eye fatigue reduction mechanism 1009 is a mechanism for reducing eye fatigue of the user. To reduce eye fatigue of the user, for example, stimulation, massage, stretching of the area around the eyes, use of eye drops, warming of the area around the eyes, etc. In this embodiment, the eye fatigue reduction mechanism 1009 includes, as a component for warming the area around the eyes, an electric heating wire that generates heat when current is applied and a thermistor for controlling the heating temperature.

[0022] Each device, such as the processor 1001 and the memory 1002, is connected by a bus for communicating information. The bus may be configured using a single bus, or may be configured using different buses between each device.

[0023] The head mounted display device 10 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0024] 2 is a block diagram showing the functional configuration of the head-mounted display device 10. In the head-mounted display device 10, a processor 1001 reads a program or the like from a storage 1003 to a memory 1002 and executes the program, thereby realizing the functions of an acquisition unit 11, an output unit 12, a detection unit 13, and a reduction unit 14.

[0025] The acquisition unit 11 is mainly realized by the communication device 1004, and acquires, for example, VR data for realizing VR via a communication network (not shown).

[0026] The output unit 12 outputs content based on the VR data acquired by the acquisition unit 11. The output unit 12 includes a display unit 121 realized by the display device 1007 and a sound emission unit 122 realized by the sound emission device 1008, and displays images and outputs sounds.

[0027] The detection unit 13 detects an action that the user has intentionally taken to reduce eye strain caused by viewing an image displayed on the display unit 121. Examples of such an action include the following.

[0028] When a user feels eye fatigue (hereinafter referred to as eye fatigue), the user may intentionally close their eyes tightly in an attempt to relieve the fatigue. At this time, the muscles of the eyes tense and relax, causing the headband for attaching the head-mounted display device 10 (the user's own device) to the user's head to slightly expand and contract. Therefore, a strain sensor, which is one of the sensor group 1006, is provided in the headband, and the expansion / contraction state of the headband is detected based on the detection value thereof. In other words, the detection unit 13 detects an action intentionally performed by the user to relieve eye fatigue based on the expansion / contraction state when the headband for attaching the head-mounted display device 10 to the user's head expands and contracts in response to the user's action to relieve eye fatigue.

[0029] FIG. 3 is a diagram showing an example of the appearance of the head-mounted display device 10, as viewed from the side in contact with the user's face. A face pad 102 is provided in contact with the user's face, surrounding displays 101 provided in front of the user's two eyes. A stretchable headband 103 is connected to both ends of the face pad 102 at the left and right ends. The headband 103 is provided with at least one strain sensor 104. For example, when a user intentionally closes their eyes tightly to relieve eye fatigue, the headband expands and contracts by a certain amount within a certain time period. When such a stretching state occurs more than a threshold value per unit time, the detection unit 13 detects that an action to relieve eye fatigue has been taken. The stretching state of the headband when a user intentionally closes their eyes tightly to relieve eye fatigue can be identified in advance, for example, by experimentally measuring the stretching state of a large number of users.

[0030] Furthermore, because eyestrain causes blurred vision, the user may operate the focus adjustment function of the head-mounted display device 10 in an attempt to focus their eyes on the image displayed on the display 101. Such operation of the focus adjustment function may be performed, for example, immediately after starting up the head-mounted display device 10, but if the focus adjustment function is operated even when the time is not immediately after starting up, it is highly likely that the user is suffering from eyestrain. Therefore, the detection unit 13 monitors the content of the operation received by the operation device 1005, and detects that an action to reduce eyestrain has been performed if the frequency of the user's operation to adjust the focus of the eyes on the displayed image per unit time is equal to or greater than a threshold value after a predetermined time has elapsed since starting up the head-mounted display device 10.

[0031] Furthermore, when a user experiences eye fatigue, the user may remove the head-mounted display device 10 from their head. Therefore, if the user removes and puts on the head-mounted display device 10 frequently, for example, once every 5 to 10 minutes, it can be determined that the user is experiencing eye fatigue. Therefore, as shown in FIG. 3 , a proximity sensor 105, which is one of the sensor group 1006, is provided inside the housing of the head-mounted display device 10, and the detection unit 13 detects the removal state of the head-mounted display device 10 based on the detection value. In other words, the detection unit 13 detects that an action to reduce eye fatigue has been taken when the frequency of removing the head-mounted display device 10 from the user's head per unit time is equal to or greater than a threshold value.

[0032] Furthermore, when a user experiences eye fatigue, they may recognize stiffness in their neck or shoulders (i.e., pain caused by poor circulation) and stretch their neck or shoulders to promote blood circulation in the neck or shoulders. Therefore, as shown in FIG. 3 , the head-mounted display device 10 is provided with an acceleration sensor 106 and a gyro sensor 107, which are part of the sensor group 1006. The detection unit 13 estimates the user's head movement based on the detected values ​​and detects that the user is performing an action such as rotating their neck or shoulders. The detection unit 13 then detects an action the user intentionally performed to relieve eye fatigue based on the frequency of the user's actions to promote blood circulation in the neck or shoulders. The range of detected values ​​of the acceleration sensor 106 and the gyro sensor 107 when the user stretches by rotating their neck or shoulders can be determined in advance by, for example, experimentally measuring the detected values ​​for a large number of users.

[0033] The detection unit 13 performs detection by comparing an index value indicating the amount of each of the above-described actions performed by the user with a threshold. Specifically, as shown in Fig. 4, the detection unit 13 stores a threshold to be compared with an index value indicating the amount of each of the actions corresponding to each type of action performed by the user. When the index value indicating the amount of each of the above-described actions performed by the user is equal to or greater than the threshold corresponding to the type of action, the detection unit 13 determines that the user has performed an intentional action to reduce eye fatigue.

[0034] For example, if the type of action is a user experiencing eye fatigue intentionally closing their eyes tightly, causing the headband to expand and contract, the index value indicating the amount of that action is the number of times a specified expansion and contraction state occurs in the headband, and the threshold is that such expansion and contraction state occurs A times or more per unit time.

[0035] The detection unit 13 may determine that an intentional action to reduce eye fatigue has been performed when the index value of each action for all the action types illustrated in Figure 4 is equal to or greater than the threshold value corresponding to that type of action, or may determine that an intentional action to reduce eye fatigue has been performed when the index value of at least one of all the action types illustrated in Figure 4 is equal to or greater than the threshold value corresponding to that type of action.

[0036] Returning to the explanation of Fig. 2, the reduction unit 14 is a function mainly realized by the eye fatigue reduction mechanism 1009. When the detection unit 13 detects an intentional action by the user to reduce eye fatigue, the reduction unit 14 performs an operation to reduce the eye fatigue. Specifically, in order to perform an operation to promote blood flow around the user's eyes, the reduction unit 14 energizes the heating wire 141 provided in the face pad 102, thereby warming the area around the user's eyes through the face pad 102.

[0037] [Operation] Next, the operation of this embodiment will be described. Fig. 5 is a flowchart showing an example of the operation of the head-mounted display device 10. In Fig. 5, the output unit 12 outputs content based on the VR data acquired by the acquisition unit 11. As a result, an image expressing VR is displayed on the display unit 121, and sound is output by the sound emission unit 122 (step S11).

[0038] The detection unit 13 attempts to detect an action that the user has intentionally taken to reduce eye fatigue caused by viewing an image displayed on the display unit 121 (step S12).

[0039] If an action intentionally taken by the user to reduce eye fatigue is detected (step S12; YES), the reduction unit 14 performs an operation to reduce the eye fatigue (step S13). Specifically, the reduction unit 14 starts energizing the heating wire 141, and stops energizing the heating wire 141 when the temperature of the thermistor reaches a set temperature. This promotes blood flow around the user's eyes while maintaining an appropriate temperature when warming the area around the user's eyes, thereby reducing the user's eye fatigue.

[0040] According to the above embodiment, it is possible to detect and further reduce eye fatigue of a user based on an action taken by the user of his or her own volition to reduce eye fatigue caused by viewing an image.

[0041] [Modifications] The present invention is not limited to the above-described embodiment. The above-described embodiment may be modified as follows. Furthermore, two or more of the following modifications may be combined and implemented.

[0042] [Variation 1] In the above embodiment, when the detection unit 13 detects an action to reduce eye fatigue, the reduction unit 14 performs an action of warming the area around the user's eyes as an action to promote blood flow around the user's eyes. The action to promote blood flow around the user's eyes is not limited to this example, and may be, for example, an action of applying vibrations or massaging the area around the user's eyes. In this case, an eye fatigue reduction mechanism 1009 including a vibrator, an eccentric roller, etc. is provided inside the face pad 102, and the reduction unit 14 drives the eye fatigue reduction mechanism 1009 to provide an appropriate stimulation around the user's eyes, thereby promoting blood flow around the user's eyes.

[0043] [Variation 2] In the above embodiment, the detection unit 13 performed detection by comparing an index value indicating the amount of an action performed by a user with the threshold value exemplified in FIG. 4 . In some cases, a single head-mounted display device 10 may be used by multiple users, such as family members or friends. In such cases, the threshold value used may be set for each user. For example, each user may be able to freely specify a threshold value for each type of action using the operation device 1005. Then, as exemplified in FIG. 6 , the detection unit 13 stores a user ID identifying each user who may potentially use the head-mounted display device 10 and a corresponding threshold value specified by the user, and performs detection using this. It is considered that the amount of an action performed by a user when experiencing eye fatigue varies from person to person. However, according to this variation, it is possible to detect an action to relieve eye fatigue for each individual user.

[0044] [Modification 3] In the case of the above-described modification 2, the detection unit 13 needs to identify the user wearing the head-mounted display device 10. This user identification may be performed based on the situation from the time the user wears the head-mounted display device 10 on their head until they start using it. Then, the detection unit 13 sets a threshold value according to the identified user and performs detection.

[0045] Here, the situation until the user puts the head mounted display device 10 on his / her head and starts using it is represented by, for example, a size value around the user's head based on the stretch state of the headband 103 and a focus adjustment value by the user. These size values ​​around the head and focus adjustment values ​​are often approximately unique to each user, so it is possible to identify the user using these values.

[0046] For this reason, as shown in FIG. 7 , the detection unit 13 stores a user ID identifying each user who may potentially use the head-mounted display device 10 in association with a head circumference value estimated from the amount of stretch of the headband when the user previously wore the head-mounted display device 10 on their head or parameters such as a focus adjustment value previously set by the user on the head-mounted display device 10. The detection unit 13 then acquires the parameters from the strain sensor 104 or the operation device 1005 before the user wears the head-mounted display device 10 on their head and begins using it. The detection unit 13 then performs user identification based on the user ID stored in association with a value approximate to the acquired parameter. User identification can be performed using, for example, a user ID used when logging in to a system, but users may find it cumbersome to enter such a user ID. In contrast, this modification enables user identification based on natural movements performed by the user before wearing the head-mounted display device 10 on their head and beginning to use it, without requiring such a login operation.

[0047] [Variation 4] The user may be able to command the alleviation unit 14 to start the eye fatigue reduction operation. In this way, when the user is able to command the alleviation unit 14 to start the operation, the detection unit 13 may set the threshold based on the detection state of the detection unit 13 when the user commands the alleviation unit 14 to start the operation, when performing detection by comparing an index value indicating the amount of action performed by the user with a threshold. This is because the amount of action performed by the user when the user commands the alleviation unit 14 to start the operation is appropriate to use as a threshold for determining whether the user feels eye fatigue.

[0048] The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (e.g., wired, wireless, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or multiple devices.

[0049] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0050] For example, the head-mounted display device 10 according to an embodiment of the present disclosure may function as a computer that performs the processing of the present disclosure.

[0051] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA1000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0052] The present invention may also be an information processing method including: an acquisition step of acquiring campaign information including information on stores participating in a new campaign to be held and the business types to which each of the stores belongs; a hierarchical Bayesian model including stores that have participated in multiple past campaigns and the business types to which the stores belong, each at a different hierarchical level; a calculation step of calculating effectiveness information regarding the effectiveness of the new campaign using the acquired campaign information; and an output step of outputting the calculated effectiveness information. The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be reordered as long as they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to the specific order presented.

[0053] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be transmitted to another device.

[0054] The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0055] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0056] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, should be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc. Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then such wired and / or wireless technologies are included within the definition of a transmission medium.

[0057] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof. Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings.

[0058] Furthermore, the information, parameters, etc. described in this disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information.

[0059] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0060] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0061] The "unit" in the configuration of each of the above devices may be replaced with "means," "circuit," "device," etc.

[0062] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0063] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0064] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0065] 10: Head-mounted display device, 11: Acquisition unit, 12: Output unit, 121: Display unit, 122: Sound emission unit, 13: Detection unit, 14: Reduction unit, 101: Display, 102: Face pad, 103: Headband, 104: Strain sensor, 105: Proximity sensor, 106: Acceleration sensor, 107: Gyro sensor, 141: Heating wire, 1001: Processor, 1002: Memory, 1003: Storage, 1004: Communication device, 1005: Operation device, 1006: Sensor group, 1007: Display device, 1008: Sound emission device, 1009: Eye fatigue reduction mechanism.

Claims

1. A head-mounted display device comprising: a display unit that displays an image; and a detection unit that detects an action taken by the user of their own volition to reduce eye fatigue caused by viewing the image displayed by the display unit.

2. The head-mounted display device according to claim 1, characterized in that the detection unit performs the detection based on the expansion and contraction state of a headband for attaching the device to the user's head when the headband expands and contracts in response to the user's actions to reduce eye fatigue.

3. The head-mounted display device according to claim 1, characterized in that the detection unit performs the detection based on a user's operation to adjust the focus of the eyes on the image displayed by the display unit.

4. The head-mounted display device according to claim 1, characterized in that the detection unit performs the detection based on an action of removing the device from the user's head.

5. The head-mounted display device according to claim 1, characterized in that the detection unit performs the detection based on an action taken by the user to promote blood circulation in the neck or shoulders.

6. The head-mounted display device according to claim 1, characterized in that when the detection unit performs the detection by comparing an index value indicating the amount of the action performed by the user with a threshold, the threshold is set for each user.

7. The head-mounted display device according to claim 6, characterized in that the detection unit identifies the user based on the situation up until the user puts the device on their head and starts using it, and sets the threshold value according to the identified user.

8. A head-mounted display device according to claim 1, further comprising a reduction unit that performs an action to reduce eye fatigue when the detection unit detects the action to reduce eye fatigue.

9. The head-mounted display device according to claim 8, wherein the lightening section is a mechanism that operates to promote blood flow around the user's eyes.

10. A head-mounted display device according to claim 8, characterized in that the user can command the reduction unit to start operating, and the detection unit, when performing the detection by comparing an index value indicating the amount of the action performed by the user with a threshold, sets the threshold based on the detection state of the detection unit when the user commands the reduction unit to start operating.

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