Display device and control method of display device

Abstract

To provide a display device which enables a user to recover from eye fatigue, and to provide a control method of the display device.SOLUTION: A display device of the disclosure includes: a housing configured to be attached to a head of a user; a display unit which displays an image in the housing; a temperature detecting unit configured to detect a temperature on a front face side, where the image is displayed, of the display unit; an exhaust heat control unit configured to conduct exhaust heat generated on a rear face side of the display unit to the front face side of the display unit; and a temperature control unit configured to control conduction of the exhaust heat by the exhaust heat control unit, based on the temperature detected by the temperature detecting unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The technology disclosed herein relates to a display device, in particular a display device used in an XR device, and a method for controlling the display device. [Background technology]

[0002] In recent years, XR devices such as head-mounted displays and smart glasses that adopt XR technologies such as VR (Virtual Reality), AR (Augmented Reality), and MR (Mixed Reality) have been actively developed. Patent Document 1 describes a system for blowing heated air heated by a heater to the eyes as an ophthalmic system for an AR device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2018-509983 Summary of the Invention [Problem to be solved by the invention]

[0004] When a user continues to use an XR device, there is a problem that eye strain accumulates due to continuing to look at the display. Warming the eyeballs is an effective means of recovering the user's eye strain. However, the system of Patent Document 1 may not sufficiently recover the user's eye strain.

[0005] The technology disclosed herein has been made in consideration of the above-mentioned points, and has an object to provide a display device and a control method for the display device that can relieve eye fatigue of a user. [Means for solving the problem]

[0006] In order to solve the above problems, the display device related to the technology disclosed herein includes a display device characterized by having a housing to be worn on a user's head, a display unit that displays an image within the housing, a temperature detection unit that detects the temperature of the front side of the display unit on which the image is displayed, a heat exhaust control unit that conducts exhaust heat generated on the back side of the display unit to the front side of the display unit, and a temperature control unit that controls the conduction of the exhaust heat by the heat exhaust control unit based on the temperature detected by the temperature detection unit.

[0007] In addition, in order to solve the above problems, a control method for a display device related to the technology disclosed herein includes a control method for a display device having a housing to be worn on a user's head and a display unit that displays an image within the housing, characterized in that the control method for a display device includes a step of detecting the temperature of the front side of the display unit on which the image is displayed, a step of conducting exhaust heat generated on the back side of the display unit to the front side of the display unit by a heat exhaust control unit of the display device, and a step of controlling the conduction of the exhaust heat by the heat exhaust control unit based on the detected temperature. Effect of the Invention

[0008] According to the technology of the present disclosure, it is possible to provide a display device and a method for controlling the display device that can relieve eye strain of a user. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a display device according to a first embodiment; [Diagram 2] FIG. 1 is a schematic diagram illustrating an example of an XR device according to a first embodiment; [Diagram 3] FIG. 1 is a diagram showing an example of the inside of an XR device during non-eye strain control in Example 1. [Figure 4] FIG. 1 is a diagram showing an example of the inside of an XR device when controlling eye strain in the first embodiment. [Diagram 5] 1 is a flowchart of a process executed by an XR device according to a first embodiment. [Figure 6]FIG. 13 is a schematic diagram showing an example of an XR device according to a second embodiment; [Figure 7] FIG. 13 is a diagram showing an example of the inside of an XR device during non-eye strain control in Example 2. [Figure 8] FIG. 13 is a diagram showing an example of the inside of an XR device when controlling eye strain in Example 2. [Figure 9] 11 is a flowchart of a process executed by an XR device according to a second embodiment. [Figure 10] FIG. 13 is a schematic diagram showing an example of an XR device according to Example 3. [Figure 11] FIG. 13 is a diagram showing an example of the inside of an XR device during non-eye strain control in Example 3. [Figure 12] FIG. 13 is a diagram showing an example of the inside of an XR device when controlling eye strain in the third embodiment. [Figure 13] 11 is a flowchart of a process executed by an XR device according to a third embodiment. [Figure 14] Flowchart of anti-fogging process executed by the XR device according to the third embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the accompanying drawings. Note that the configurations shown in the following embodiments are merely examples, and the present invention is not limited to the illustrated configurations.

[0011] (First embodiment) The configuration of the display device according to the first embodiment of the present invention will be described with reference to Fig. 1. As shown in Fig. 1, the display device 100 has an eye strain control unit 101, an eyeball observation unit 102, a temperature control unit 103, a reflectance measurement unit 104, a temperature detection unit 105, a heating unit 106, a heat exhaust control unit 107, an image processing unit 108, and a display unit 109.

[0012] In this embodiment, the display device 100 is a display device having a housing to be worn on the user's head, and can be applied to XR devices such as head-mounted displays, smart glasses, etc. In addition, from the viewpoint of increasing the accuracy and effectiveness of temperature control, the display device 100 is preferably a sealed display device having a housing configured in a shape that covers the area around the user's eyes among XR devices.

[0013] Display unit 109 displays an image inside the housing of display device 100 to a user wearing display device 100. Temperature detection unit 105 detects the temperature disposed on the display side (front side) of display unit 109. Exhaust heat control unit 107 conducts exhaust heat on the non-display side (rear side) of display unit 109 to the areas around both eyes of the user wearing display device 100. This controls the temperature of the space covering the user's eyes inside display device 100.

[0014] The display device 100 according to this embodiment will be described in detail below with reference to examples. In the following description, the accompanying drawings will be referred to, and the same reference numerals will be used to designate similar elements throughout the examples, and duplicated descriptions will be omitted. Also, each example can be modified and combined as appropriate. Note that the configuration, operation, etc. of the display device 100 according to this embodiment are not limited to the following examples.

[0015] Example 1 2A and 2B are external views (FIG. 2A) of the display front side (user side, image display side) and (FIG. 2B) of the display back side (opposite side to the user, non-display side) of an XR device 110 as an example of a display device according to this embodiment. In the following description, the display front side is the front side on which an image of the display unit is displayed, and the display back side is the back side of the display unit. The XR device 110 has a housing 111. The housing 111 has a display unit 124, 125 that constitutes the display unit 109, and a display unit 126 that is connected to the display unit 109. The housing 111 is provided with lenses 112 and 113 for visually recognizing an image displayed on the housing 111. The housing 111 is also provided with ventilation holes 114, 115, and 116, a holder 117, and a temperature sensor 118 constituting the temperature detection unit 105. In the first embodiment, it is assumed that the medium that conducts the exhaust heat generated on the rear side of the display in the XR device 110 is air.

[0016] 3A and 3B show the air flow in the housing 111 in a state where the eye strain control unit 101 is not controlling the XR device 110 on the display front side (FIG. 3A) and the display rear side (FIG. 3B) (hereinafter, also referred to as "non-eye strain control"). As shown in FIG. 3B, three fans 121, 122, and 123 constituting the heat exhaust control unit 107 that controls the circulation of air in the space on the display rear side to induce heat exhaust are provided on the display rear side of the housing 111. In addition, a display 124 that displays an image for the user's left eye and a display 125 that displays an image for the user's right eye are provided on the display rear side. The displays 124 and 125 constitute the display unit 109. In the XR device 110, when the eye strain control is not performed, the exhaust heat on the display rear side caused by driving the displays 124 and 125 is discharged to the outside of the housing 111 through the ventilation hole 114 by the three fans 121, 122, and 123.

[0017] Further, the housing 111 is provided with a heat exhaust valve 119 which separates the space on the front side of the display from the space on the rear side of the display and constitutes the heat exhaust control unit 107 which opens and closes the ventilation hole 114. When the heat exhaust valve 119 is in the closed position (FIGS. 3A and 3B), the space on the front side of the display and the space on the rear side of the display are not in communication with each other. When the heat exhaust valve 119 is in the closed position, the ventilation hole 114 is in an open state. On the other hand, when the heat exhaust valve 119 is in the open position (FIGS. 4A and 4B), the space on the front side of the display and the space on the rear side of the display are in communication with each other. When the heat exhaust valve 119 is in the open position, the ventilation hole 114 is in a closed state.

[0018] 4A and 4B show the air flow inside the housing 111 in a state where control is being performed by the eye strain control unit 101 on the display front side (FIG. 4A) and the display rear side (FIG. 4B) of the XR device 110 (hereinafter also referred to as "eye strain control"). When the user feels eye strain while using the XR device 110, the user manually operates the XR device 110 to enable (ON) the eye strain recovery function of the XR device 110. The selection / cancellation (ON / OFF) of the eye strain recovery function of the XR device 110 may be performed by a physical button or physical switch (not shown) provided on the housing 111. Alternatively, in addition to this, the selection may be made on a GUI (Graphical User Interface) displayed on the displays 124 and 125 of the XR device 110.

[0019] 5 is a diagram showing a flowchart of processing executed by the XR device 110. As an example, the eye strain control unit 101, which is a CPU (Central Processing Unit), controls each unit of the XR device 110 to execute the following processing.

[0020] In step S101, the eyestrain control unit 101 determines whether the eyestrain recovery function is enabled (ON) or not (OFF) in the XR device 110. When the eyestrain control unit 101 determines that the eyestrain recovery function is enabled (S101: ON), the process proceeds to step S102. When the eyestrain control unit 101 determines that the eyestrain recovery function is not enabled (S101: OFF), the process proceeds to step S105. In step S102, the eyestrain control unit 101 transmits an activation signal to the temperature control unit 103. When the temperature control unit 103 receives the activation signal, it executes temperature detection by the temperature detection unit 105. The temperature detection unit 105 detects the temperature of the space between the lenses 112, 113 of the displays 124, 125 and the user (the space in front of the displays) by the temperature sensor 118. The temperature detection unit 105 transmits a signal indicating the detected temperature to the temperature control unit 103. do.

[0021] Next, in step S103, the temperature control unit 103 refers to a set temperature previously set by the user based on the signal received from the temperature detection unit 105, and compares the set temperature with the detected temperature. If the set temperature is higher than the detected temperature (S103 If the temperature control unit 103 determines that the set temperature is If the temperature is equal to or lower than the detected temperature (S103: NO), the process proceeds to step S105.

[0022] In step S104, the temperature control unit 103 opens the heat exhaust valve 119 by the heat exhaust control unit 107. In addition, the temperature control unit 103 changes the opening and closing angle of the heat exhaust valve 119 by the heat exhaust control unit 107. As a result, the exhaust heat generated on the rear side of the displays 124, 125 is sent to the front side of the displays 124, 125 through the heat exhaust valve 119 (FIGS. 4A and 4B). On the other hand, in step S105, the temperature control unit 103 closes the heat exhaust valve 119 by the heat exhaust control unit 107. As a result, the exhaust heat generated on the rear side of the displays 124, 125 is exhausted to the outside of the housing 111 through the ventilation hole 114 (FIGS. 3A and 3B). As a result, the contribution of the exhaust heat to the temperature rise on the front side of the displays 124, 125 can be reduced.

[0023] The set temperature referred to by the temperature control unit 103 reflects a temperature selected by the user from, for example, 30°C, 35°C, 40°C, 45°C, and 50°C. Alternatively, the temperature control unit 103 may refer to a set temperature (for example, 40°C) designated in advance. The temperature control unit 103 may control the rotation speed (rpm) of the three fans 121, 122, and 123 independently of the control of the heat exhaust valve of the heat exhaust control unit 107. The heat exhaust control unit 107 opens and closes the vent hole 114 provided on the upper part of the housing 111 by the heat exhaust valve. As a result, the exhaust heat generated on the rear side of the display unit 109 is sent to the space between the lenses 112 and 113 and the user's eyes using air as a heat medium. In this embodiment, the heat exhaust valve 119 that closes the vent hole 114 as the heat exhaust control unit 107 is provided only on the vent hole 114, but the heat exhaust valve may also be provided on other vent holes to perform heat exhaust control.

[0024] In addition, when the user manually disables the eye strain recovery function or when an operation to power off the XR device 110 occurs, the eye strain control unit 101 sends a stop signal to the temperature control unit 103 to stop the temperature control. When the temperature control unit 103 receives the stop signal, it closes the heat exhaust valve 119 of the heat exhaust control unit 107. This results in a state in which the space on the front side of the displays 124, 125 and the space on the rear side of the displays 124, 125 are not in communication with each other.

[0025] As described above, the temperature control unit 103 controls the open / close state of the heat exhaust valve 119 of the heat exhaust control unit 107 and / or the rotation speed of the fans 121, 122, and 123 depending on the difference between the set temperature and the detected temperature. In this way, the temperature control unit 103 controls so that the temperature detected by the temperature detection unit 105 is maintained near the set temperature. As a result, the space around the eyes of the user wearing the XR device 110 is warmed, which is expected to promote recovery from eye strain.

[0026] Example 2 Next, an XR device 120 will be described as an example of a display device according to Example 2 of this embodiment. In the following description, the same components as those in the XR device 110 described above will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0027] FIG. 6 is an external view of the display front side (surface side of the display unit) of the XR device 120 according to this embodiment. As shown in FIG. 6, the housing 111 is provided with gaze sensors 126 and 127 that constitute the eyeball observation unit 102. The eyeball observation unit 102 is an acquisition unit that acquires information regarding the movement of the eyeballs of the user wearing the XR device 120. Note that the XR device The configuration and appearance of the rear side of the display of 120 are the same as those of the XR device 110 (FIG. 2B).

[0028] In this embodiment, the gaze sensor 126 detects the gaze by tracking the movement of the left eye of the user wearing the XR device 120, and identifies the position on the display 124 of the gaze of the left eye. The gaze sensor 127 detects the gaze by tracking the movement of the right eye of the user wearing the XR device 120, and identifies the position on the display 125 of the gaze of the right eye. The eye strain control unit 101 uses information on the movement of the user's eyeballs obtained from the gaze sensors 126 and 127 to reduce eye strain in the user.

[0029] 9 is a diagram showing a flowchart of processing executed by the XR device 120. As an example, the eye strain control unit 101, which is a CPU, controls each unit of the XR device 120 to execute the following processing.

[0030] In step S201, the eyestrain control unit 101 starts gaze detection by the gaze sensors 126 and 127. Next, in step S202, the eyestrain control unit 101 determines whether or not the user is experiencing eyestrain based on information about the movement of the user's eyeballs obtained by the gaze sensors 126 and 127. Here, the eyestrain control unit 101 is a determination unit that determines whether or not the user is experiencing eyestrain based on information about the movement of the user's eyeballs obtained by the acquisition unit.

[0031] Specifically, when the user performs initial settings of the XR device 120 on the GUI of the start-up screen displayed on the displays 124 and 125 when the XR device 120 starts to operate, the gaze sensors 126 and 127 calculate the gaze response speed of the user. For example, the image processing unit 108 displays a dialog box in the center of the displays 124 and 125 to prompt the user to select a set temperature, and subsequently displays a set temperature selection screen on the displays 124 and 125. At this time, the gaze sensors 126 and 127 measure the gaze response speed when the user's gaze moves from the dialog box to the set temperature selection screen.

[0032] In another example, the temperature control unit 103 records the continuous driving time from the start of driving the XR device 120. Then, in the XR device 120, the driving time is displayed, for example, in the upper right area of ​​the displays 124 and 125 every certain time (for example, every 30 minutes) from the start of driving, to inform the user of the usage time of the XR device 120. The timing to start measuring the continuous driving time can be appropriately determined, such as when the XR device is turned on or when the displays 124 and 125 start displaying the information. The gaze sensors 126 and 127 measure the response speed of the gaze when the user's gaze moves from the current position to the display screen of the driving time.

[0033] Then, the eye strain control unit 101 compares the measured gaze response speed with the user's gaze response speed measured at the start of driving, and determines whether or not the user is experiencing eye strain based on the comparison result.

[0034] When the eye strain control unit 101 determines that the user is experiencing eye strain (S202: YES), the process proceeds to step S203. When the eye strain control unit 101 determines that the user is not experiencing eye strain (S202: NO), the process proceeds to step S207. In this embodiment, the processes of steps S203, S204, S205, and S207 are the same as steps S102, S103, S104, and S105 in the first embodiment.

[0035] The set temperature referred to by the temperature control unit 103 reflects a temperature selected by the user from, for example, 30° C., 35° C., 40° C., 45° C., and 50° C. Alternatively, the temperature control unit 103 may A preset temperature (for example, 40° C.) may be referred to. Temperature control unit 103 may control the rotation speed (rpm) of three fans 121, 122, and 123 independently of the control of the heat exhaust valve of heat exhaust control unit 107. Heat exhaust control unit 107 opens and closes vent hole 114 provided on the upper part of housing 111 by heat exhaust valve 119. As a result, exhaust heat generated on the rear side of display unit 109 is sent to the space between lenses 112 and 113 and the user's eyes using air as a heat medium. In this embodiment, heat exhaust valve 119 that closes vent hole 114 as heat exhaust control unit 107 is provided only on vent hole 114, but heat exhaust valves may also be provided on other vent holes to control exhaust heat.

[0036] The temperature control unit 103 controls the open / close state of the heat exhaust valve 119 of the heat exhaust control unit 107 and the rotation speed of the fans 121, 122, and 123 depending on the difference between the set temperature and the detected temperature, so as to maintain the temperature detected by the temperature detection unit 105 close to the set temperature.

[0037] In this embodiment, following the process of step S205, in step S206, in order to bring the temperature detected by the temperature detection unit 105 closer to the set temperature, the temperature control unit 103 controls at least one of the brightness and the duty ratio related to the image display on the display unit 109. In addition, the temperature control unit 103 may control the frame rate of the image display. In this way, the temperature control unit 103 can control the amount of exhaust heat generated in the space on the rear side by the displays 124 and 125, which are heat sources in the XR device 120. In addition, by controlling the opening and closing operation of the exhaust heat valve 119 and the process of the image display on the display unit 109 in association with each other, it is possible to increase the heating speed of the space in the XR device 120 and improve the accuracy of temperature maintenance. Note that if the temperature of the space in the XR device 120 is suddenly increased, condensation may occur on the displays 124 and 125 and the lenses 112 and 113. Therefore, the temperature control unit 103 may perform exhaust heat control so that the heating speed does not exceed a preset speed based on the temperature difference between the detected temperature at the start of the temperature control and the set temperature.

[0038] Therefore, in step S207, when the heat exhaust valve 119 is in the closed position (FIG. 7), the exhaust heat generated in the displays 124, 125 is exhausted to the outside of the housing 111 through the ventilation hole 114. Also, in steps S205 and S206, when the heat exhaust valve 119 is in the open position (FIG. 8), the exhaust heat generated in the displays 124, 125 is sent to the front side of the displays. This warms the space around the eyes of the user wearing the XR device 120, which is expected to promote recovery from eye strain.

[0039] When the user manually disables the eye strain recovery function or when the power of the XR device 110 is turned off, the eye strain control unit 101 transmits a stop signal to the temperature control unit 103 to stop the temperature control. When the temperature control unit 103 receives the stop signal, it closes the heat exhaust valve 119 of the heat exhaust control unit 107. This causes the space in front of the displays 124 and 125 to be in a state where it is not in communication with the space behind the displays 124 and 125. In addition, after the temperature control unit 103 starts the temperature control, the eye strain control unit 101 acquires the measurement result of the response speed of the gaze by the gaze sensors 126 and 127 at regular time intervals. Then, when the eye strain control unit 101 determines based on the measurement result that the response speed has improved to a threshold value at which it is possible to determine that the user is not suffering from eye strain, the eye strain control unit 101 may stop the temperature control by the temperature control unit 103.

[0040] Example 3 Next, an XR device 130 will be described as an example of a display device according to Example 3 of this embodiment. In the following description, the same components as those of the XR devices 110 and 120 described above will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0041] 10A and 10B are diagrams showing the front side of the display of the XR device 130 according to the present embodiment. 10A is an external view of the display (front side of the display unit) and FIG. 10B is an external view of the display back side (rear side of the display unit). As shown in FIG. 10A, the housing 111 of the XR device 130 is provided with the lenses 112 and 113 provided on the displays 124 and 125, the holder 117, the temperature sensor 118 constituting the temperature detection unit 105, and the gaze sensors 126 and 127. Furthermore, the housing 111 is provided with the reflectance measurement unit 133 and the heat conduction unit 135.

[0042] Thermally conductive portion 135 (for example, aluminum oxide) is a medium that conducts exhaust heat generated on the rear side of displays 124 and 125. Among the parts that constitute thermally conductive portion 135, the parts surrounding lenses 112 and 113 are made of a soft material such as rubber that has high thermal conductivity.

[0043] In the XR device 130 of this embodiment, a reflectance measuring unit 133 that measures the light reflectance of the lenses 112 and 113 is provided on the front side of the display (FIG. 10A). The reflectance measuring unit 133 irradiates the surfaces of the lenses 112 and 113 with light, receives the reflected light from the lenses 112 and 113, and calculates the reflectance based on the amount of the received light. Then, the reflectance measuring unit 133 determines whether or not the lenses 112 and 113 are clouded based on the calculated reflectance.

[0044] 11A and 11B are conceptual diagrams showing the thermal conduction of exhaust heat in the housing 111 during non-eye strain control on the display front side (FIG. 11A) and the display rear side (FIG. 11B) of the XR device 130. As shown in FIG. 11B, on the display rear side of the housing 111, the displays 124 and 125 are provided on heat sinks 137 and 138, respectively, for conducting exhaust heat generated by driving the displays 124 and 125. In addition, a movable part 136 is provided that overlaps with the heat sinks 137 and 138 and is in contact with the heat sinks 137 and 138.

[0045] Further, on the display rear side of housing 111, another heat conductive section 139 is provided on the opposite side of heat conductive section 135 with movable section 136 in between. Heat conductive section 139 has rectangular section 139a that can come into contact with movable section 136 and extends toward the outer periphery of housing 111, and exposed section 139b that is connected to rectangular section 139a and forms part of the outer periphery of housing 111. When heat conductive section 139 comes into contact with movable section 136, it conducts heat from movable section 136 from rectangular section 139a to exposed section 139b.

[0046] In this embodiment, heat sinks 137 and 138 are a first heat conductive portion that conducts exhaust heat from display unit 109, and heat conductive portion 135 is a second heat conductive portion provided on the front side of display unit 109. In addition, movable portion 136 is a switching portion that is connected to the first heat conductive portion and switches the connection with the second heat conductive portion.

[0047] In order to efficiently conduct heat from the displays 124 and 125, a highly thermally conductive grease or adhesive sheet is provided between the displays 124 and 125 and the heat sinks 137 and 138. The movable part 136 has a disk part 136a configured to overlap and contact the heat sinks 137 and 138, and a rectangular convex part 136b extending outward from the outer periphery of the disk part 136a. The disk part 136a can rotate around the center of the circle of the disk part 136a as the rotation axis. The convex part 136b is provided so as to come into contact with the heat conductive part 135 or the heat conductive part 139 when the disk part 136a rotates. In FIG. 11B, the movable part 136 is in contact with the heat sinks 137 and 138 and the heat conductive part 139. As a result, heat generated by displays 124 and 125 is discharged to the outside of housing 111 via heat sinks 137 and 138 , movable section 136 , and thermal conductive section 139 .

[0048] In the state shown in FIG. 11A and FIG. 11B, the movable part 136 is not in contact with the heat conductive part 135. 11A and 11B are in contact with heat conductive portion 139. Therefore, during the non-eye strain control, the exhaust heat generated on the display rear side by driving displays 124, 125 is discharged from heat sinks 137, 138 to the outside of housing 111 through movable portion 136 and heat conductive portion 139, and then through exposed portion 139b. The dashed arrows shown in FIGS. 11A and 11B show a schematic diagram of the manner in which the exhaust heat generated on the display rear side is discharged to the outside of housing 111 by heat conductive portion 139.

[0049] 13 is a diagram showing a flowchart of the process executed by the XR device 130. As an example, the eye strain control unit 101, which is a CPU, controls each unit of the XR device 130 to execute the following process. Note that the processes of steps S301, S302, S304, and S306 are the same as those of steps S201, S202, S204, and S206. The processes of steps S303, S305, and S307 will be described in detail below.

[0050] 12A and 12B are conceptual diagrams showing the thermal conduction of exhaust heat in the housing 111 during eye strain control on the display front side (FIG. 12A) and the display back side (FIG. 12B) of the XR device 130. In step S303, when the temperature control unit 103 receives a start-up signal from the eye strain control unit 101, it executes temperature detection by the temperature detection unit 105. In this embodiment, the temperature detection unit 105 detects the temperature of the heat conduction unit 135, more specifically, the temperature of a soft material such as rubber with high thermal conductivity arranged around the lenses 112 and 113.

[0051] Then, when the set temperature is higher than the detected temperature (S304: YES), in step S305, the temperature control unit 103 rotates the movable unit 136 by the exhaust heat control unit 107 to bring the movable unit 136 into contact with the heat conductive unit 135 (FIGS. 12A and 12B). This causes the exhaust heat generated by the displays 124, 125 to be conducted from the heat sinks 137, 138 to the heat conductive unit 135 via the movable unit 136. As a result, the portion of the heat conductive unit 135 surrounding the lenses 112, 113 is heated, and the space around the eyes of the user wearing the XR device 130 is warmed, which is expected to promote recovery from eye strain.

[0052] Meanwhile, in step S307, temperature control unit 103 rotates movable unit 136 by heat exhaust control unit 107 to bring movable unit 136 into contact with heat conductive unit 139 (FIGS. 11A and 11B). As a result, exhaust heat generated in displays 124, 125 is conducted from heat sinks 137, 138 to heat conductive unit 139 via movable unit 136. As a result, exhaust heat generated in displays 124, 125 is discharged from heat conductive unit 139 to the outside of housing 111.

[0053] The set temperature referred to by temperature control unit 103 reflects a temperature selected by the user from, for example, 30° C., 35° C., 40° C., 45° C., and 50° C. Alternatively, temperature control unit 103 may refer to a set temperature (for example, 40° C.) that is specified in advance. Temperature control unit 103 controls the contact between movable unit 136 and heat conductive units 135 and 139 depending on the difference between the set temperature and the detected temperature, and maintains the detected temperature near the set temperature.

[0054] In this embodiment, in order to bring the temperature detected by the temperature detection unit 105 closer to the set temperature, the temperature control unit 103 changes the brightness, frame rate, etc. of the image displayed on the display unit 109 by the image processing unit 108. This allows the temperature control unit 103 to control the amount of exhaust heat generated in the space on the rear side by the displays 124 and 125, which are heat sources in the XR device 130. In addition, by controlling the opening and closing operation of the heat exhaust valve 119 and processing the image display on the display unit 109 in association with each other, it is possible to increase the heating speed of the space in the XR device 130 and improve the accuracy of temperature maintenance. Note that if the temperature of the space in the XR device 130 is suddenly increased, condensation may occur on the displays 124 and 125 and the lenses 112 and 113. Therefore, the temperature control unit 103 sets the detected temperature at the start of temperature control and Heat exhaust control may be performed based on the temperature difference from the set temperature so that the heating rate does not exceed a preset rate.

[0055] When the user manually disables the eye strain recovery function or when the power of the XR device 130 is turned off, the eye strain control unit 101 transmits a stop signal to the temperature control unit 103 to stop the temperature control. When the temperature control unit 103 receives the stop signal, it closes the heat exhaust valve 119 of the heat exhaust control unit 107. This causes the space in front of the displays 124 and 125 to be in a state where it is not in communication with the space behind the displays 124 and 125. In addition, after the temperature control unit 103 starts the temperature control, the eye strain control unit 101 acquires the measurement result of the response speed of the gaze by the gaze sensors 126 and 127 at regular time intervals. Then, when the eye strain control unit 101 determines based on the measurement result that the response speed has improved to a threshold value at which it is possible to determine that the user is not suffering from eye strain, the eye strain control unit 101 may stop the temperature control by the temperature control unit 103.

[0056] Next, the anti-fogging function of the lenses 112 and 113 executed in the XR device 130 will be described with reference to the flowchart of Fig. 14. The lenses 112 and 113 become fogged when there is a large difference between the outside air temperature and the display temperature. Therefore, the heating process for anti-fogging the lenses 112 and 113 according to this flowchart can be performed independently of the process for recovering the user's eyestrain according to the flowchart of Fig. 13.

[0057] In step S401, the reflectance measuring unit 133 irradiates the lenses 112 and 113 with light, receives the reflected light, and calculates the light reflectance of the lenses 112 and 113 based on the amount of reflected light. Next, in step S402, the reflectance measuring unit 133 compares the calculated reflectance with a threshold value to determine whether or not the lenses 112 and 113 are clouded. If the calculated reflectance is less than the threshold value, the reflectance measuring unit 133 determines that the lenses are clouded. Then, if the reflectance measuring unit 133 determines that at least one of the lenses 112 and 113 is clouded (S402: YES), it transmits an activation signal to the temperature control unit 103. If the reflectance measuring unit 133 determines that neither the lenses 112 nor the lenses 113 is clouded (S402: NO), the process returns to step S401. Then, in step S403, when the temperature control unit 103 receives the start-up signal from the reflectance measuring unit 133, it controls the heating unit 106 to heat the lenses 112 and 113, thereby eliminating the fogging state.

[0058] The anti-fogging function of the lenses 112, 113 in the XR device 130 may be selected / cancelled (ON / OFF) by, for example, operating a physical button or switch on the housing 111 when the user feels fogging on the lenses 112, 113. Alternatively, or in addition to this, the anti-fogging function of the lenses 112, 113 may be selected / cancelled based on an operation of the GUI of the XR device 130.

[0059] In addition, in a closed type display device such as the XR device 130 of this embodiment, for example, when the XR device 130 is applied to underwater goggles, the housing 111 is configured to have a waterproof structure for the space between the housing 111 and the user. This makes it possible to provide the XR device 130 with added waterproof performance between the housing 111 and the user. As a result, when the user wears the XR device 130 and dives underwater, information that assists the user's actions underwater can be displayed on the displays 124 and 125. In addition, since the user cannot easily put on or take off the XR device 130 during underwater diving, the XR device 130 becomes a display device that can more suitably exhibit the above-mentioned eye strain recovery and lens anti-fogging functions.

[0060] (Other Examples) The present invention can also be realized by a process in which a program for implementing one or more of the functions of the above-described embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) that implements one or more of the functions.

[0061] The disclosure of this embodiment includes the following configuration, method, and program. (Configuration 1) A housing that is worn on the user's head; A display unit that displays an image within the housing; a temperature detection unit that detects a temperature on a front side of the display unit on which the image is displayed; a heat exhaust control unit that conducts exhaust heat generated on a back surface side of the display unit to the front surface side of the display unit; a temperature control unit that controls the conduction of the exhaust heat by the exhaust heat control unit based on the temperature detected by the temperature detection unit; A display device comprising: (Configuration 2) the exhaust heat control unit has a valve that separates a space on the front side of the display unit from a space on the back side of the display unit, The exhaust heat control unit conducts the exhaust heat to the front side of the display unit by opening and closing the valve. 2. The display device according to configuration 1. (Configuration 3) the exhaust heat control unit has a first heat conductive unit that conducts the exhaust heat, a second heat conductive unit provided on the front side of the display unit, and a switching unit that is connected to the first heat conductive unit and switches a connection to the second heat conductive unit; The exhaust heat control unit switches the connection with the second heat conductive unit by the switching unit, thereby conducting the exhaust heat to the front side of the display unit. 2. The display device according to configuration 1. (Configuration 4) An acquisition unit that acquires information regarding the movement of the user's eyeball; a determination unit that determines whether or not the user is experiencing eye strain based on the information acquired by the acquisition unit; and The display device described in any one of configurations 1 to 3, characterized in that when the judgment unit determines that the user is experiencing eye strain, the temperature control unit conducts the exhaust heat to the surface side of the display unit using the exhaust heat control unit. (Configuration 5) 5. The display device according to configuration 4, wherein the information regarding the movement of the user's eyeball is information regarding a response speed of the user's line of sight. (Configuration 6) The display device described in configuration 4 or 5, characterized in that the temperature control unit stops the conduction of the exhaust heat by the heat exhaust control unit to the surface side of the display unit when the judgment unit determines that the user is not experiencing eye strain. (Configuration 7) The display device according to any one of configurations 1 to 6, wherein the temperature control unit controls the amount of exhaust heat generated by controlling at least one of the brightness and the duty ratio related to the image display in the display unit. (Configuration 8) a lens through which the user views an image displayed on the display unit; A reflectance measuring unit for measuring the reflectance of the lens; A heating unit that heats the lens; and The temperature control unit controls the heating of the lens by the heating unit based on the reflectance of the lens measured by the reflectance measurement unit. 8. The display device according to any one of configurations 1 to 7. (Configuration 9) 9. The display device according to any one of configurations 1 to 8, wherein the housing is configured in a shape that covers the area around the user's eyes. (Configuration 10) 10. The display device according to configuration 9, wherein the housing has a waterproof structure for a space between the housing and the user. (method) A method for controlling a display device having a housing that is worn on a user's head and a display unit that displays an image within the housing, comprising: detecting a temperature of a front surface side of the display unit on which the image is displayed; a step of conducting exhaust heat generated on a back surface side of the display unit to the front surface side of the display unit by a heat exhaust control unit of the display device; controlling the conduction of the exhaust heat by the exhaust heat control unit based on the detected temperature; 13. A method for controlling a display device comprising the steps of: (program) A program for causing a computer to execute the display device control method according to Method 1. [Explanation of symbols]

[0062] 100 display device, 103 temperature control unit, 105 temperature detection unit, 107 exhaust heat control unit, 109 display unit, 111 housing

Claims

1. A housing that is worn on the user's head; A display unit that displays an image within the housing; a temperature detection unit that detects a temperature on a front side of the display unit on which the image is displayed; a heat exhaust control unit that conducts exhaust heat generated on a back surface side of the display unit to the front surface side of the display unit; a temperature control unit that controls the conduction of the exhaust heat by the exhaust heat control unit based on the temperature detected by the temperature detection unit; A display device comprising:

2. the exhaust heat control unit has a valve that separates a space on the front side of the display unit from a space on the back side of the display unit, The exhaust heat control unit conducts the exhaust heat to the front side of the display unit by opening and closing the valve.

2. The display device according to claim 1 .

3. the exhaust heat control unit includes a first heat conductive unit that conducts the exhaust heat, a second heat conductive unit that is provided on the front side of the display unit, and a switching unit that is connected to the first heat conductive unit and switches a connection to the second heat conductive unit; The exhaust heat control unit switches the connection with the second heat conductive unit by the switching unit, thereby conducting the exhaust heat to the front side of the display unit.

2. The display device according to claim 1 .

4. An acquisition unit that acquires information regarding the movement of the user's eyeball; a determination unit that determines whether or not the user is experiencing eye strain based on the information acquired by the acquisition unit; and The display device according to any one of claims 1 to 3, characterized in that when the judgment unit determines that the user is experiencing eye strain, the temperature control unit causes the exhaust heat control unit to conduct the exhaust heat to the surface side of the display unit.

5. The display device according to claim 4 , wherein the information on the movement of the user's eyeball is information on a response speed of the user's line of sight.

6. The display device according to claim 4, characterized in that the temperature control unit stops the conduction of the exhaust heat by the exhaust heat control unit to the surface side of the display unit when the judgment unit judges that the user is not experiencing eye strain.

7. The display device according to claim 1 , wherein the temperature control unit controls at least one of a luminance and a duty ratio related to an image display on the display unit, thereby controlling the amount of generated exhaust heat.

8. a lens through which the user views an image displayed on the display unit; A reflectance measuring unit for measuring the reflectance of the lens; A heating unit that heats the lens; and The temperature control unit controls the heating of the lens by the heating unit based on the reflectance of the lens measured by the reflectance measurement unit.

2. The display device according to claim 1 .

9. The display device according to claim 1 , wherein the housing is configured in a shape that covers the area around the user's eyes.

10. The display device according to claim 9 , wherein the housing has a waterproof structure for a space between the housing and the user.

11. A method for controlling a display device having a housing that is worn on a user's head and a display unit that displays an image within the housing, comprising: detecting a temperature of a front surface side of the display unit on which the image is displayed; a step of conducting exhaust heat generated on a back side of the display unit to the front side of the display unit by a heat exhaust control unit of the display device; controlling the conduction of the exhaust heat by the exhaust heat control unit based on the detected temperature; 13. A method for controlling a display device comprising the steps of:

12. A program for causing a computer to execute the display device control method according to claim 11.

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