Display control system, display control method, and program

Abstract

Provided is a display control system (S) that controls one or more display panels provided to an HMD (1) that can be worn on the head of a user, the display control system (S) comprising: a remaining battery level acquisition unit (502) that acquires the remaining capacity of a battery (105) that supplies power to the HMD (1); a display mode setting unit (504) that, on the basis of the remaining capacity, sets a display mode to either a basic mode or a power saving mode in which power consumption required to drive the display panel is less than that in the basic mode; and a display control unit (506) that controls the display panel on the basis of the set display mode.

Description

Display control system, display control method, program

[0001] The present disclosure relates to a display control system, a display control method, and a program.

[0002] Conventionally, as shown in Patent Document 1, a display panel that displays an image and a head-mounted display having an optical system including a lens are known.

[0003] International Publication No. 2016 / 136657

[0004] In a head-mounted display (display device) having a battery and wearable on a user's head, suppression of power consumption is an issue.

[0005] One object of the present disclosure is to provide a display control system, a display control method, and a program that suppress power consumption in a display device wearable on a user's head.

[0006] The display control system proposed in the present disclosure is a display control system that controls one or more display panels provided in a display device wearable on a user's head, and includes a battery remaining amount acquisition unit that acquires the remaining amount of power of a battery that supplies power to the display device, and a display mode setting unit that sets a display mode to either a basic mode or a power saving mode in which power consumption for driving the display panels is less than that in the basic mode based on the remaining amount of power, and a display control unit that controls the display panels based on the set display mode.

[0007] The display control method proposed in the present disclosure is a display control method that controls one or more display panels provided in a display device wearable on a user's head, and a processor executes steps of acquiring the remaining amount of power of a battery that supplies power to the display device, setting a display mode to either a basic mode or a power saving mode in which power consumption for driving the display panels is less than that in the basic mode based on the remaining amount of power, and controlling the display panels based on the set display mode.

[0008] The program proposed in this disclosure is a program for controlling one or more display panels provided on a display device that can be worn on a user's head, and causes a computer to function as: a battery level acquisition means for acquiring the remaining power of a battery that supplies power to the display device; a display mode setting means for setting the display mode to either a basic mode or a power saving mode that consumes less power to drive the display panel than the basic mode, based on the remaining power; and a display control means for controlling the display panel based on the set display mode.

[0009] This is a perspective view showing the appearance of the HMD according to this embodiment. This is a schematic diagram showing the configuration of the display panel and optical system as viewed from above. This is a schematic diagram showing the configuration of the display panel and optical system as viewed from the left. This is a diagram showing an example of the display image and display area in this embodiment. This is a diagram showing an example of switching the display mode in this embodiment. This is a schematic diagram showing how the optical mirror moves. This is a block diagram showing the hardware configuration of the display control system according to this embodiment. This is a block diagram showing an example of the functions realized by the display control system according to this embodiment.

[0010] Hereinafter, embodiments of the present invention (hereinafter referred to as "this embodiment") will be described with reference to the drawings. In the following description, the head-mounted display, which is a display device, will be referred to as "HMD (Head Mounted Display)". In the following description, the directions indicated by X1 and X2 in the figure will be the right and left, respectively, the directions indicated by Y1 and Y2 in the figure will be the up and down, respectively, and the directions indicated by Z1 and Z2 in the figure will be the front and rear, respectively. Each of these directions indicates the direction as seen from the perspective of the user wearing the HMD 1.

[0011] [Overview of HMD1] Figure 1 is a perspective view showing the external appearance of the HMD according to this embodiment. The HMD1 preferably has a mounting band that surrounds the user's head and a main body housing supported at the front of the mounting band. The main body housing houses various components such as a display panel and optical system.

[0012] The HMD1 shown in Figure 1 is just one example and is not limited thereto. The HMD1 only needs to be worn on the user's head and have a display panel that displays images, and the shape of the mounting band and main housing are not limited to those shown.

[0013] Figure 2 is a schematic diagram showing the configuration of the display panel and optical system as viewed from above. Figure 3 is a schematic diagram showing the configuration of the display panel and optical system as viewed from the left. Figures 2 and 3 show the display panel and optical system on the user's left eye side, but the configurations shown in Figures 2 and 3 are preferably provided on both the right and left eye sides.

[0014] The HMD1 has a first display panel 10, a second display panel 20, and a third display panel 30. The HMD1 also has an optical system including a first lens 31, a second lens 32, and an optical mirror 40. Note that the optical system shown in Figures 2 and 3 is an example, and other optical components may be included.

[0015] [First display panel 10 and second display panel 20] The first display panel 10 and the second display panel 20 may display a two-dimensional image or a three-dimensional image. The first display panel 10 and the second display panel 20 may be, for example, a liquid crystal panel or an organic electroluminescent display panel, but their type is not particularly limited.

[0016] The first display panel 10 is positioned so that its display surface is directly in front of the user's eyes. The second display panel 20 is preferably positioned to the left of the first display panel 10, with its display surface tilted relative to the display surface of the first display panel 10. By arranging the two display panels side by side in this manner, the viewing angle in the left-right direction (horizontal direction) can be widened. Note that the arrangement and orientation of the first display panel 10 and the second display panel 20 are not limited to those shown in the illustration.

[0017] [First Lens 31 and Second Lens 32] The first lens 31 is provided facing the first display panel 10. Specifically, the first lens 31 is provided so that its optical axis is perpendicular to the display surface of the first display panel 10. The first lens 31 may function as a convex lens that guides the first image light L1 emitted from the first display panel 10 to the user's pupil. The distance between the first lens 31 and the first display panel 10 may be set appropriately to obtain a desired focal length.

[0018] The second lens 32 is positioned opposite the second display panel 20. Specifically, the second lens 32 is positioned so that its optical axis is perpendicular to the display surface of the second display panel 20. The second lens 32 preferably functions as a convex lens that guides the second image light L2 emitted from the second display panel 20 to the user's pupil. The distance between the second lens 32 and the second display panel 20 should be appropriately set to obtain a desired focal length.

[0019] The first lens 31 and the second lens 32 may be aspherical lenses, spherical lenses, free-form lenses, etc.

[0020] [Third Display Panel 30] The third display panel 30 is preferably positioned above or below the eyes of the user wearing the HMD 1, as shown in Figure 3. The third display panel 30 is preferably capable of displaying two-dimensional or three-dimensional images with a higher resolution (pixel density) than the first display panel 10. The third display panel 30 may be, for example, a liquid crystal panel or an organic electroluminescent display panel, but its type is not particularly limited. In this embodiment, an example using a microOLED (Organic Light-Emitting Diode) as the third display panel 30 will be described.

[0021] [Optical Mirror 40] The optical mirror 40 is preferably configured to transmit at least a portion of the first image light L1 emitted from the first display panel 10 and to reflect at least a portion of the third image light L3 emitted from the third display panel 30. For example, a half-mirror with a transmission-to-reflection ratio of 1:1 for light of a specific wavelength may be used as the optical mirror 40. However, the transmission-to-reflection ratio is not limited to 1:1 and may be adjusted as appropriate.

[0022] As shown in Figure 3, at least a portion of the first image light L1 emitted from the first display panel 10 is to pass through the optical mirror 40 and enter the user's pupil. Similarly, at least a portion of the third image light L3 emitted from the third display panel 30 is to be reflected by the optical mirror 40 and enter the user's pupil. This allows the user to view the images displayed on the first display panel 10 and the third display panel 30.

[0023] [Display Image] Figure 4 is a diagram showing an example of a display image and display area in this embodiment. When the HMD1 is in use, the user views the display image D1 displayed on the first display panel 10, the display image D2 displayed on the second display panel 20, and the display image D3 displayed on the third display panel 30 in display area A. Display area A is an area that includes display area A1, display area A2 adjacent to display area A1 on the left side, and display area A3 located inside the outer edge of display area A1. It is preferable that display area A1 is wider than display area A3.

[0024] As shown in Figure 4, in the HMD1, the optical system is arranged and display control is performed such that display image D1 is visible to the user in display area A1, display image D2 is visible to the user in display area A2, and display image D3 is visible to the user in display area A3. The area of ​​display area A1 that overlaps with display area A3 is preferably an area where black is displayed or an area where no image is displayed.

[0025] Display image D3 should be an image with a higher resolution than display images D1 and D2. As shown in Figure 4, by placing the display area A3, where the high-resolution image is displayed, in an area with high human visual sensitivity, the user will be able to view a high-quality image.

[0026] [Display Mode] Next, the display modes in this embodiment will be described with reference to Figures 4 and 5. Figure 5 is a diagram showing an example of switching the display mode in this embodiment. The HMD1 employs a configuration that switches the display mode in order to suppress power consumption. Figure 5 shows an example of switching the display mode to the first to third power-saving modes according to the remaining battery power.

[0027] Since the HMD1 according to this embodiment has a rechargeable battery, it is desirable to suppress power consumption in order to extend the usable time. In particular, since the HMD1 has multiple display panels on both the right and left eye sides, and uses a third display panel 30 capable of displaying high-resolution images, the power consumption required to drive the display panels is large.

[0028] Therefore, the HMD1 according to this embodiment employs a configuration that allows switching between a basic mode and a power-saving mode, which consumes less power to drive the display panel than the basic mode, based on the remaining power of the battery.

[0029] When the battery is fully charged, the display mode should be set to basic mode. As shown in Figure 4, in basic mode, the first display panel 10, the second display panel 20, and the third display panel 30 should be controlled so that the display image is shown in all of the display areas A1, A2, and A3.

[0030] [First Power Saving Mode] When the battery power level falls below a first threshold, the display mode should be switched from the basic mode to the first power saving mode. As shown in Figure 5, in the first power saving mode, it is desirable that the display image D2 is not displayed in a part of the display area A2. Specifically, the light-emitting area of ​​the second display panel 20 should be reduced by not emitting light from pixels on the left side of the second display panel 20. This narrows the viewing angle, but it is possible to suppress the power consumption required to drive the second display panel 20.

[0031] [Second Power Saving Mode] Furthermore, when the battery power level falls below a second threshold, the display mode should be switched from the first power saving mode to the second power saving mode. The second threshold should be less than the first threshold. As shown in Figure 5, in the second power saving mode, the display image D2 should not be displayed in the display area A2. In other words, not all pixels on the second display panel 20 should be illuminated. This further narrows the viewing angle, but it can suppress the power consumption required to drive the second display panel 20.

[0032] Furthermore, if the second display panel 20 is a liquid crystal panel, it is preferable that all or part of the display image D2 is not displayed by not lighting all or part of the backlight.

[0033] [Third Power Saving Mode] Furthermore, when the remaining battery power falls below the third threshold, the display mode should be switched from the second power saving mode to the third power saving mode. The third threshold should be less than the second threshold. As shown in Figure 5, in the second power saving mode, the display image D3 should not be displayed in the display area A3. Instead, the display image D1 should be displayed in the display area A1 superimposed on the display area A3. This stops the operation of the third display panel 30, which is capable of displaying high-resolution images. As a result, the resolution in the center of the user's field of view decreases, but the power consumption required to operate the third display panel 30 can be suppressed.

[0034] In the third power-saving mode, the third display panel 30 is not used, and therefore the optical mirror 40 does not need to be provided. For this reason, in the third power-saving mode, the optical mirror 40 is preferably moved to a position where it is out of the way of the first image light L1. As shown in Figure 6, by moving the optical mirror 40 out of the way of the first image light L1, the user can view the display area A1 without using the optical mirror 40. As a result, the visibility of the display area A1 is improved. In this case, the HMD1 is preferably equipped with a drive mechanism to move the optical mirror 40. The drive mechanism may be, for example, a mechanism that uses an elastic spring to flip up the optical mirror 40, thereby moving it out of the way of the first image light L1.

[0035] Alternatively, the optical mirror 40 may include a material whose transmittance is variable. For example, the optical mirror 40 may include an electrochromic material whose transmittance can be adjusted in response to the applied voltage. In the third power saving mode, the transmittance of the optical mirror 40 to the first image light L1 should be increased. This improves the visibility of the display area A1 without providing a mechanism to move the optical mirror 40.

[0036] Alternatively, the optical mirror 40 may have a function that selectively reflects or transmits only light with a specific polarization state, such as a polarizing beam splitter. This allows the first image light L1 to be transmitted almost completely, improving the visibility of the display area A1 without providing a mechanism to move the optical mirror 40.

[0037] It should be noted that in HMD1, it is not necessary to use all three power-saving modes (1st to 3rd). For example, the user may configure the display mode to be limited to only the basic mode and the third power-saving mode. In this case, it would be desirable for the display mode to switch from the basic mode to the third power-saving mode when the battery power level falls below the first threshold.

[0038] [Other Power Saving Modes] Any power saving mode that can reduce power consumption compared to the basic mode is acceptable, and is not limited to those described with reference to Figure 5. Furthermore, each of the processes for reducing power consumption described below may be used in appropriate combinations with the first to third power saving modes described with reference to Figure 5.

[0039] For example, the resolution of the display image in power-saving mode should be lower than the resolution of the display image in basic mode. For instance, the resolution of the display image shown on the display panel can be reduced by lowering the rendering resolution (drawing density).

[0040] The resolution of the displayed images may be gradually reduced based on the remaining battery power. For example, the resolution of display image D2, which is viewed from a position away from the center of the user's field of vision, may be reduced first, and then, if the remaining battery power decreases further, the resolution of display images D1 and D3 may be reduced.

[0041] Alternatively, instead of lowering the resolution, the brightness of the display panel may be reduced. The resolution and brightness should be adjusted to a degree that minimizes the visibility of boundaries between adjacent display images. For example, if the resolution of the second display image D2 is reduced in power-saving mode, the resolution of the area of ​​the first display image D1 closest to the boundary with the second display image D2 may be reduced accordingly.

[0042] Furthermore, the second display panel 20 may be disabled depending on the user's settings. In addition, the second display panel 20 may be configured to be removable from the main body housing of the HMD1.

[0043] Furthermore, while Figure 4 shows an example where display areas A1 to A3 are arranged so that they do not overlap and their edges coincide, display areas A1 to A3 may include overlapping areas. In this case, it is preferable to overlay a common display image in the overlapping area. This allows the user to perceive the boundaries of each display area without any sense of incongruity.

[0044] Also, it is preferable that the luminance of the overlapping area in the power-saving mode is lower than that of the overlapping area in the basic mode. For example, by reducing the luminance of either the first display panel 10 or the second display panel 20, the total value of the luminance in the overlapping area may be reduced. Thereby, power consumption can be suppressed.

[0045] Also, in the power-saving mode, in the overlapping area, it may be that either one of the overlapping display images is not displayed. For example, when the left part of the display area A1 and the right part of the display area A2 partially overlap, it is preferable to stop the light emission of the pixels of the second display panel 20 (that is, to reduce the luminance to 0) so that the display image D2 is not displayed in the overlapping area.

[0046] Also, for example, the number of frames (images) displayed per second (frame rate) in the power-saving mode is preferably lower than the frame rate in the basic mode. Also, the frame rate may be gradually decreased according to the remaining power of the battery. Also, the frame rate may be sequentially decreased for each display panel according to the remaining power of the battery. Also, for example, in the power-saving mode, frame skipping may be performed to skip a part of the frames for display.

[0047] [Hardware Configuration of Display Control System S] FIG. 7 is a block diagram showing the hardware configuration of the display control system according to the present embodiment. As shown in FIG. 7, the display control system S preferably includes a control unit 101, a storage unit 102, a communication unit 103, an operation unit 104, and a battery 105 in addition to the first to third display panels 10, 20, and 30.

[0048] The control unit 101 includes at least one processor. The control unit 101 is preferably a program control device such as a CPU that operates according to a program installed in the display control system S. Also, the control unit 101 preferably includes a GPU (Graphics Processing Unit) that draws an image in the frame buffer based on graphics commands and data supplied from the CPU.

[0049] The storage unit 102 may include, for example, a main memory such as ROM or RAM, and an auxiliary storage device such as an HDD or SSD. The storage unit 102 may store programs executed by the control unit 101. In addition to programs for realizing various functions of the display control system S described later, the storage unit 102 may also store, for example, a game program (game software). Furthermore, the storage unit 102 may have an area reserved for a frame buffer on which images are rendered by the GPU.

[0050] The communication unit 103 may be a communication interface such as an Ethernet (registered trademark) module or a wireless LAN module.

[0051] The operation unit 104 is a user interface such as a controller, and it is preferable that it receives user input and outputs a signal indicating the content of that input to the control unit 101.

[0052] The battery 105 is preferably a rechargeable power source. The battery 105 is preferably detachably mounted on the main housing of the HMD 1. Since the HMD 1 is rechargeable by the battery 105, it is preferable that it does not have a cable for connecting to a commercial power source.

[0053] Although not shown in the diagram, the display control system S may include an IMU (Inertial Measurement Unit), which is a sensor that detects the head movements of the user wearing the HMD1, as well as a tracking camera or video see-through camera that captures images of the environment surrounding the user using the HMD1.

[0054] [Functions Realized by Display Control System S] Figure 8 is a block diagram showing an example of functions realized by the display control system according to this embodiment. As shown in Figure 8, the display control system S may include a three-dimensional data input unit 501, a battery level acquisition unit 502, a user operation reception unit 503, a display mode setting unit 504, an image data generation unit 505, a display control unit 506, and an optical mirror control unit 507. These functions are mainly realized by the control unit 101. However, it is not limited to this, and some or all of these functions may be realized by a control unit provided in a computer other than the HMD1. In other words, the display control system S may consist of multiple computers, not just the HMD1. In this case, the multiple computers may be connected to each other wirelessly or by wired connections.

[0055] The three-dimensional data input unit 501 may, for example, receive three-dimensional data output from a computer such as a game console.

[0056] The battery level acquisition unit 502 acquires the remaining power of the battery 105 that supplies power to the HMD1.

[0057] The user operation reception unit 503 may receive user operations related to the setting of the display mode. For example, based on the user operations received by the user operation reception unit 503, a power saving mode may be pre-selected or the available power saving modes may be limited.

[0058] The display mode setting unit 504 may set the display mode based on the remaining power of the battery 105. Specifically, if the remaining power of the battery 105 is sufficient, the display mode may be set to the basic mode. Also, if the remaining power of the battery 105 is below a predetermined threshold, the display mode may be set to the power saving mode. Multiple predetermined thresholds may be set, and the power saving mode may be switched in stages each time the remaining power falls below these thresholds.

[0059] The image data generation unit 505 may generate image data by rendering three-dimensional data at a resolution based on the display mode set by the display mode setting unit 504. For example, if the display mode is set to power saving mode, the rendering resolution may be reduced. Alternatively, the rendering field of view may be narrowed according to the light-emitting area of ​​the display panel corresponding to the display mode.

[0060] The display control unit 506 may output image data generated by the image data generation unit 505 to the display panels 10, 20, and 30 based on the display mode set by the display mode setting unit 504. For example, if the display mode is set to power saving mode, the light-emitting area of ​​the second display panel 20 may be reduced.

[0061] In the power-saving mode in which the third display panel 30 is stopped from driving, the optical mirror control unit 507 may move the optical mirror 40 so that it is moved out of the optical path of the first image light L1.

[0062] Furthermore, in the power-saving mode in which the third display panel 30 is stopped from driving, the optical mirror control unit 507 may perform voltage control so as to increase the transmittance of the optical mirror 40 to the first image light L1. In this case, the optical mirror 40 may contain a material whose transmittance can be adjusted in response to the applied voltage.

[0063] [Summary] In this embodiment, power consumption in the HMD1 can be suppressed. In particular, the configuration of this embodiment is effective when the HMD1 has multiple display panels, as power consumption tends to be high. Furthermore, the configuration of this embodiment is effective when the HMD1 has a display panel with high performance, such as high resolution, as power consumption tends to be high. In addition, by employing a configuration that gradually reduces the light-emitting area and resolution of the display panel according to the remaining battery power, power consumption can be suppressed while maintaining a state in which the user can view the image without discomfort.

[0064] Furthermore, in power-saving mode, the viewing angle is narrowed by reducing the light-emitting area of ​​the display panel, allowing the user, whose eyes are covered by the HMD1, to visually recognize that the remaining power of the battery 105 is decreasing. This enables the user to take measures such as charging the battery 105 to prevent the HMD1 from suddenly shutting down.

[0065] [Other] In this embodiment, an HMD1 having three display panels was used as an example, but the number of display panels is not limited to this. For example, there may be only one display panel. In that case, in power saving mode, it is advisable to reduce the rendering resolution or the light-emitting area of ​​the single display panel.

[0066] [Note] For example, the display control system can also be configured as follows: (1) A display control system for controlling one or more display panels provided on a display device that can be worn on the user's head, comprising: a battery level acquisition unit for acquiring the remaining power of a battery that supplies power to the display device; a display mode setting unit for setting the display mode to either a basic mode or a power saving mode which consumes less power to drive the display panel than the basic mode, based on the remaining power; and a display control unit for controlling the display panel based on the set display mode. (2) The display control system according to (1), wherein the light-emitting area of ​​the display panel in the power saving mode is smaller than the light-emitting area of ​​the display panel in the basic mode. (3) The display control system according to (1) or (2), wherein the resolution of the display image displayed on the display panel in the power saving mode is lower than the resolution of the display image in the basic mode. (4) The display control system according to any one of (1) to (3), wherein the brightness of the display image displayed on the display panel in the power saving mode is lower than the brightness of the display image in the basic mode. (5) The display control system according to any one of (1) to (4), wherein the one or more display panels include a first display panel that displays a first display image in a first display area positioned in front of the user's line of sight, and a second display panel that displays a second display image in a second display area adjacent to the first display area. (6) The display control system according to (5), wherein the light-emitting area of ​​the second display panel in the power-saving mode is smaller than the light-emitting area of ​​the second display panel in the basic mode. (7) The display control system according to (5) or (6), wherein in the power-saving mode, the resolution of the second display image is lower than the resolution of the first display image. (8) The display control system according to any one of (5) to (7), wherein the brightness of the second display image in the power-saving mode is lower than the brightness of the second display image in the basic mode. (9) The display control unit stops driving the second display panel in the power-saving mode.(10) The display control system according to any one of (5) to (9), wherein the second display panel is configured to be removable from the housing of the display device. (11) The display control system according to any one of (5) to (10), wherein the first display area and the second display area include overlapping areas that overlap each other, and the brightness of the overlapping area in the power saving mode is lower than the brightness of the overlapping area in the basic mode. (12) The display control system according to any one of (1) to (11), wherein the one or more display panels include a first display panel capable of displaying a first display image of a first resolution in a first display area positioned in front of the user's field of view, and a third display panel capable of displaying a third display image of a third resolution higher than the first resolution in a third display area located inside the outer edge of the first display area, and the display device has an optical mirror that transmits at least a portion of the first image light emitted from the first display panel and reflects at least a portion of the third image light emitted from the third display panel, thereby causing the first display image to be displayed in the first display area and the third display image to be displayed in the third display area. (13) The display control system according to (12), wherein the resolution of the third display image in the power saving mode is lower than the resolution of the third display image in the basic mode. (14) The display control system according to (12) or (13), wherein the display control unit has an optical mirror control unit that stops the driving of the third display panel in the power saving mode and moves the optical mirror so as to move it out of the optical path of the first image light in the power saving mode. (15) The display control system according to any one of (12) to (14), wherein the optical mirror includes a material with variable transmittance and has an optical mirror control unit that increases the transmittance of the optical mirror to the first image light in the power saving mode. (16) The display control system according to any one of (1) to (15), wherein the display control unit has a user operation reception unit that receives user operations regarding the setting of the display mode, and the display mode setting unit sets the display mode based on the user operations.(17) The display control system according to any one of (1) to (16), wherein the power saving mode includes a first power saving mode and a second power saving mode which consumes less power to drive the display panel than the first power saving mode, and the display mode setting unit sets the display mode to the first power saving mode when the remaining power is less than or equal to a first threshold, and sets the display mode to the second power saving mode when the remaining power is less than or equal to a second threshold which is less than the first threshold.

[0067] 1 Head-mounted display, 10 First display panel, 20 Second display panel, 502 Battery level acquisition unit, 504 Display mode setting unit, 506 Display control unit, S Display control system.

Claims

1. A display control system for controlling one or more display panels provided on a display device that can be worn on a user's head, comprising: a battery level acquisition unit for acquiring the remaining power of a battery that supplies power to the display device; a display mode setting unit for setting a display mode to either a basic mode or a power-saving mode that consumes less power to drive the display panel than the basic mode, based on the remaining power; and a display control unit for controlling the display panel based on the set display mode.

2. The display control system according to claim 1, wherein the light-emitting area of ​​the display panel in the power-saving mode is smaller than the light-emitting area of ​​the display panel in the basic mode.

3. The display control system according to claim 1, wherein the resolution of the display image displayed on the display panel in the power saving mode is lower than the resolution of the display image in the basic mode.

4. The display control system according to claim 1, wherein the brightness of the display image displayed on the display panel in the power saving mode is lower than the brightness of the display image in the basic mode.

5. The display control system according to claim 1, wherein the one or more display panels include a first display panel that displays a first display image in a first display area positioned in front of the user's line of sight, and a second display panel that displays a second display image in a second display area adjacent to the first display area.

6. The display control system according to claim 5, wherein the light-emitting area of ​​the second display panel in the power-saving mode is smaller than the light-emitting area of ​​the second display panel in the basic mode.

7. The display control system according to claim 5, wherein in the power saving mode, the resolution of the second display image is lower than the resolution of the first display image.

8. The display control system according to claim 5, wherein the brightness of the second display image in the power saving mode is lower than the brightness of the second display image in the basic mode.

9. The display control system according to claim 5, wherein the display control unit stops driving the second display panel in the power saving mode.

10. The display control system according to claim 5, wherein the second display panel is configured to be removable from the housing of the display device.

11. The display control system according to claim 5, wherein the first display area and the second display area include overlapping areas that overlap each other, and the brightness of the overlapping area in the power saving mode is lower than the brightness of the overlapping area in the basic mode.

12. The display control system according to claim 1, wherein the one or more display panels include a first display panel capable of displaying a first display image of a first resolution in a first display area positioned in front of the user's field of view, and a third display panel capable of displaying a third display image of a third resolution higher than the first resolution in a third display area located inside the outer edge of the first display area, and the display device has an optical mirror that transmits at least a portion of the first image light emitted from the first display panel and reflects at least a portion of the third image light emitted from the third display panel, thereby causing the first display image to be displayed in the first display area and the third display image to be displayed in the third display area.

13. The display control system according to claim 12, wherein the resolution of the third display image in the power saving mode is lower than the resolution of the third display image in the basic mode.

14. The display control system according to claim 12, wherein the display control unit has an optical mirror control unit that stops the driving of the third display panel in the power saving mode and moves the optical mirror so as to move it out of the optical path of the first image light in the power saving mode.

15. The display control system according to claim 12, wherein the optical mirror comprises a material having variable transmittance, and has an optical mirror control unit that increases the transmittance of the optical mirror to the first image light in the power saving mode.

16. The display control system according to claim 1, comprising a user operation receiving unit that receives user operations related to setting the display mode, wherein the display mode setting unit sets the display mode based on the user operations.

17. The display control system according to any one of claims 1 to 16, wherein the power saving mode includes a first power saving mode and a second power saving mode which consumes less power to drive the display panel than the first power saving mode, and the display mode setting unit sets the display mode to the first power saving mode when the remaining power is less than or equal to a first threshold, and sets the display mode to the second power saving mode when the remaining power is less than or equal to a second threshold which is less than the first threshold.

18. A display control method for controlling one or more display panels provided on a display device that can be worn on a user's head, the method comprising: a processor performing the steps of: acquiring the remaining power of a battery that supplies power to the display device; setting a display mode to either a basic mode or a power-saving mode that consumes less power to drive the display panel than the basic mode, based on the remaining power; and controlling the display panel based on the set display mode.

19. A program for controlling one or more display panels provided on a display device that can be worn on a user's head, comprising: a battery level acquisition means for acquiring the remaining power of a battery that supplies power to the display device; a display mode setting means for setting the display mode to either a basic mode or a power-saving mode that consumes less power to drive the display panel than the basic mode, based on the remaining power; and a display control means for controlling the display panel based on the set display mode, the program for causing a computer to function as such.

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