Display device and control method thereof

Abstract

To provide a display device which allows a user to easily view an excellent image and can suppress the power consumption.SOLUTION: A display device 300 comprises: a light source 30; and light deflection means 304 which deflects light from the light source, and allows a user to view an image by scanning a retina 308 of an eyeball 307 of the user with scan light from the light deflection means. A display device comprises: acquisition means 311, 302 which acquires information about the eyeball with respect to the display device; and control means 302 which reduces at least one of a light emission amount of the light source and a frame rate of the image in comparison to a case where a prescribed condition is satisfied when the prescribed condition for image viewing is not satisfied in the information about the eyeball.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a retinal scanning display device.

Background Art

[0002] A retinal scanning display device is disposed in front of a user's eyes, and allows the user to visually recognize an image by converging laser light near the pupil of the user's eyeball and scanning the retina. In such a display device, when the user's pupil position substantially matches the convergence point of the laser light, the laser light reaches the retina.

[0003] Immediately after the user positions such a display device in front of the eyes, the position of the display device relative to the eyeball may deviate from an appropriate position, or the orientation of the eyeball may deviate from an appropriate orientation (forward direction), such that at least a portion of the laser light does not enter the pupil, resulting in a state where a good image cannot be visually recognized. If bright laser light is irradiated onto the eyeball in such a state, contraction of the pupil makes it difficult (delays the process) for a good image to become visually recognizable, and power is wastefully consumed in the meantime.

[0004] Patent Document 1 discloses a retinal scanning display device that controls the brightness of laser light according to changes in the brightness of the external environment.

Prior Art Documents

Patent Documents

[0005]

Patent Document 2

Summary of the Invention

Problem to be Solved by the Invention

[0006] However, the retinal scanning display device of Patent Document 1 changes the brightness of laser light after the laser light enters the user's pupil, and does not control the brightness of laser light before the laser light enters the pupil.

[0007] The present invention provides a display device that allows users to easily view good images while reducing power consumption. [Means for solving the problem]

[0008] A display device, as one aspect of the present invention, comprises a light source and a light deflection means for deflecting light from the light source, and enables the viewing of an image by scanning the retina of the user's eyeball with scanning light from the light deflection means. Information about the pupil of the eyeball and information about the position where the scanning light enters the eyeball. Steps to obtain, The method includes a step of controlling the amount of light emitted from a light source to a first amount of light emitted and a second amount of light emitted lower than the first amount of light emitted. In the step of controlling the amount of light emitted, when pupil information and incident position information are acquired, the amount of light emitted is controlled to the second amount of light emitted, and based on the acquired pupil information and incident position information, if the incident position is within the pupil, the amount of light emitted is controlled to the first amount of light emitted. It is characterized by the following: Another aspect of the present invention is a display device comprising a light source and a light deflection means for deflecting light from the light source, which enables the viewing of an image by scanning the retina of the user's eyeball with scanning light from the light deflection means. The display device comprises an acquisition means for acquiring information on the eye contact time during which the eyeball is in contact with the display device, and a control means for controlling the amount of light emitted from the light source to a first light emission amount and a second light emission amount lower than the first light emission amount. The control means is characterized in that it controls the amount of light emitted to the second light emission amount before a predetermined time has elapsed for the user to adjust the position of the display device relative to the eyeball, and controls the amount of light emitted to the first light emission amount after the predetermined time has elapsed.

[0009] Another aspect of the present invention is a control method which is applied to a display device that has a light source and a light deflection means for deflecting light from the light source, and enables the viewing of an image by scanning the retina of the user's eyeball with scanning light from the light deflection means. Information about the pupil of the eyeball and information about the position where the scanning light enters the eyeball. Steps to obtain, The method includes a step of controlling the amount of light emitted from a light source to a first amount of light emitted and a second amount of light emitted lower than the first amount of light emitted. In the step of controlling the amount of light emitted, the amount of light emitted is controlled to the second amount of light emitted when pupil information and incident position information are acquired, and the amount of light emitted is controlled to the first amount of light emitted when the incident position is within the pupil based on the acquired pupil information and incident position information. It is characterized by the following: Furthermore, another aspect of the present invention is a control method applied to a display device that includes a light source and a light deflection means for deflecting light from the light source, and enables the viewing of an image by scanning the retina of the user's eyeball with scanning light from the light deflection means. The control method includes the steps of acquiring information on the eye contact time during which the eyeball is in contact with the display device, and controlling the amount of light emitted from the light source to a first amount of light emitted and a second amount of light emitted lower than the first amount of light emitted. In the step of controlling the amount of light emitted, the amount of light emitted is controlled to the second amount of light emitted before a predetermined time has elapsed for the user to adjust the position of the display device relative to the eyeball, and the amount of light emitted is controlled to the first amount of light emitted after the predetermined time has elapsed. Furthermore, a program that causes a computer to execute processing according to the above control method also constitutes another aspect of the present invention. [Effects of the Invention]

[0010] According to the present invention, a display device can easily allow users to view high-quality images while reducing power consumption. [Brief explanation of the drawing]

[0011] [Figure 1] A top view of the display device, which is Example 1. [Figure 2] A flowchart showing the process performed by the display device of Example 1. [Figure 3] A diagram illustrating the relationship between the eyeball (pupil) and laser light in the display device of Example 1. [Figure 4] Top view of the display device of Example 2. [Figure 5] A flowchart showing processing executed by the display device of Example 2. MODE FOR CARRYING OUT THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. EXAMPLES

[0013] FIG. 1 shows the configuration of a display device 300 according to Example 1 of the present invention when viewed from above. The display device 300 is disposed in front of a user's eyeball 307, and directly projects (draws) an image onto the retina of the eyeball 307. The display device 300 may be a wearable device such as an HMD (Head-Mounted Display) or a glasses-type device, or may be a non-wearable device that a user holds by hand in front of their eyes.

[0014] Note that the display device may include an imaging unit that images the external world, or may be connected to an imaging apparatus that images the external world. In this case, an image acquired by imaging by the imaging unit or the imaging apparatus may be visually recognized by the user through the display device.

[0015] The display device 300 includes a control unit 302 serving as a control means, a light source 303, a scanning mirror 304 serving as a light deflecting means, and a curved mirror 305 serving as a reflection optical system. The display device 300 further includes an eyeball detection means constituted by two infrared LEDs 309, a light splitting element 310 and a pupil sensor 311, an eyepiece unit 312, and an eyepiece sensor 313.

[0016] The control unit 302 is a microcomputer including a CPU and the like, and causes the light source 303 to emit a plurality of color lights such as RGB based on image data 301 from an imaging device or an image supply device (not shown) connected to the display device 300. The light source 303 may be configured by a laser element that emits white light and a color filter that allows a plurality of color lights among the white light to pass through in a time-division manner, or may be configured by a plurality of laser elements that emit laser lights of different colors from each other. The laser light emitted from the light source 303 is parallel light.

[0017] The scanning mirror 304 is, for example, a MEMS (Micro Electro Mechanical Systems) mirror, and changes the direction in which the laser light is reflected by oscillating a mirror surface that reflects the laser light from the light source 303. By oscillating the scanning mirror 304 about two axes so as to draw a two-dimensional image corresponding to the image data 301, scanning light as laser light deflected in two-dimensional directions is generated. Note that a mirror other than a MEMS mirror, such as a polygon mirror, may be used as the scanning mirror 304.

[0018] The curved mirror 305 reflects the laser light (scanning light) from the scanning mirror 304 toward the eyeball 307 and converges the light in the vicinity of the pupil 306 of the eyeball 307. When the position of the pupil 306 matches or substantially matches the convergence point of the laser light, the laser light passes through the pupil 306 and scans the retina 308 in the eyeball 307 in a two-dimensional direction. Accordingly, a two-dimensional image is drawn on the retina 308, and the user can visually recognize the two-dimensional image.

[0019] The control unit 302 controls the light source 303 and the scanning mirror 304. Specifically, it is possible to change the light emission amount of the light source 303 (the illuminance of the laser light on the retina 308) or change the frame rate for drawing a two-dimensional image.

[0020] The eyepiece section 312 is located on the external side of the display device 300 and receives contact with the portion of the user's face surrounding the eyeball 307 when looking into the viewfinder inside the eyepiece section 312. An eyepiece sensor 313 for detecting the user's eye position is provided near the eyepiece section 312.

[0021] Inside the display device 300, there are two infrared LEDs 309, a light-dividing element 310, and a pupil sensor 311. The infrared LEDs 309 irradiate the eyeball 307 with infrared light.

[0022] The light-dividing element 310 is a dichroic prism that selectively reflects infrared light from the light reflected by the eyeball 307. The pupil sensor 311 has an optical system that forms an image of infrared light reflected by the eyeball 307 and reflected by the light-dividing element 310, and an imaging sensor that captures the eyeball image formed by the optical system. The position (pupil center coordinates) and size (pupil diameter) of the pupil 306 can also be detected from the Purkinje image (pupil image) included in the eyeball image data acquired by the imaging sensor. Furthermore, the orientation of the eyeball 307 (direction of gaze) can also be detected from the pupil center coordinates. In addition, the relationship (distance, etc.) between the pupil center coordinates and the incident position of the laser light can also be detected.

[0023] In this embodiment, the pupil 306 is detected by the pupil sensor 311 via the light-dividing element 310, but the pupil 306 may be detected directly by the pupil sensor 311 without the light-dividing element 310.

[0024] Figure 2 shows the processing (control method) that the control unit 302 executes according to the computer program. Figures 3(a) and (b) show the relationship between the user's eyeball 307 (pupil 306) and the incident position of the laser light.

[0025] The control unit 302 starts this process when the power to the display device 300 is turned ON in response to the user turning ON a power switch (not shown) in step S101.

[0026] In step S102, the control unit 302 determines, via the eyepiece sensor 313, whether or not the user is looking at the eyepiece unit 312. Alternatively, the pupil sensor 311 may be used to determine whether or not the user is looking at the eyepiece instead of the eyepiece sensor 313. If the user is not looking at the eyepiece, the control unit 302 proceeds to step S114 and returns to step S102 without outputting laser light from the light source 303 to determine the eyepiece state again. In this embodiment, when the user is not looking at the eyepiece, the laser light is not output for the purpose of saving power. On the other hand, if the user is looking at the eyepiece, the process proceeds to step S103.

[0027] Alternatively, in step S101, the power of the display device 300 may be turned ON by detecting the eyepiece state through the eyepiece sensor 313.

[0028] In step S103, the control unit 302 causes the light source 303 to output laser light. Set the light emission amount to the second light emission amount. Control the illuminance of the laser beam When the amount of light emitted is the first amount of light emitted The illuminance level (second illuminance) will be lower than the high illuminance level (first illuminance) described later. This is for the following reasons.

[0029] In the eyeball 307, when the ambient light is bright, the pupil 306 constricts to reduce the amount of light entering the eyeball 307 in order to suppress glare. On the other hand, when the ambient light is dim, the pupil 306 dilates to increase the amount of light entering the eyeball 307 in order to improve visibility. When the ambient light is laser light from the light source 303, the lower the illuminance of the laser light, the larger the pupil diameter can be maintained. Therefore, in this embodiment, immediately after the user places the display device 300 in front of their eyes, the illuminance of the laser light is lowered to maintain the pupil diameter as large as possible, making it easier for the laser light to enter the pupil 306 and making it easier for the user to view the image (making it easier to adjust the position of the display device 300 relative to the eyeball 307). In this embodiment, low illuminance refers to an illuminance that causes the pupil 306 to constrict to a predetermined rate or less (for example, 10% or less) when laser light is incident on it. Furthermore, the low illuminance referred to in this embodiment is an illuminance at which power consumption decreases by a predetermined rate or more (for example, 10% or more) compared to the case of high illuminance, i.e., significantly.

[0030] Next, in step S104, the control unit 302 acquires eyeball image data from the pupil sensor 311, and starts detecting the position and pupil diameter of the pupil 306 from the eyeball image data.

[0031] Next, in step S105, the control unit 302 acquires the distance from the detected position (center coordinate) 400 of the pupil 306 to the incident position of the laser light. The position and diameter of the pupil 306, and the information of the incident position of the laser light from the position 400 of the pupil 306 correspond to information related to (the state or position of) the eyeball 307 with respect to the display device 300. Then, the control unit 302 defines (pupil diameter / 2) as A, and the distance from the center 400 of the pupil 306 to the incident position of the laser light as B. In this embodiment, the infrared LED 309, the pupil sensor 311, and the control unit 302 constitute an acquiring unit.

[0032] Next, in step S106, the control unit 302 determines whether A < B (the incident position of the laser light is not inside the pupil) as shown in FIG. 3(a) or A ≥ B (the incident position of the laser light is inside the pupil) as shown in FIG. 3(b). A ≥ B corresponds to a predetermined condition for image viewing. If the incident position of the laser light is not inside the pupil 306 and the user cannot visually recognize the image (the predetermined condition is not satisfied), the control unit 302 proceeds to step S115 and maintains the low illumination of the laser light for power saving. Thereafter, since it is expected that the user will move the eyeball 307 or move the display device 300 in front of the eye to visually recognize the image, the control unit 302 returns to step S105 to acquire A and B again.

[0033] On the other hand, if in step S106 the incident position of the laser light is inside the pupil 306 and the user can visually recognize the image (the predetermined condition is satisfied), the control unit 302 proceeds to step S107.

[0034] In step S107, the control unit 302 controls the light source 303 to switch the illuminance of the laser light to high illuminance (second illuminance) in order to improve the visibility of the image.

[0035] Thereafter, in consideration of the possibility that the position of the display device 300 relative to the eyeball 307 may be shifted, the control unit 302 again determines whether A<B or A≧B in step S108. This processing is particularly effective because positional deviation of the display device 300 relative to the eyeball 307 is likely to occur when the display device 300 is a non-wearable device. If A<B is satisfied, the control unit 302 proceeds to step S116, and controls the light source 303 to switch the illuminance of laser light to low illuminance for power saving. Thereafter, the control unit 302 returns to step S105 to acquire A and B again. On the other hand, if A≧B is satisfied, the control unit 302 proceeds to step S109, and proceeds to step S110 while keeping the illuminance of the laser light at high illuminance.

[0036] Note that when the display device 300 includes an imaging unit that images the external world, or when an imaging device that images the external world is connected to the display device 300, after step S109, the imaging unit or the imaging device may be caused to perform imaging, and an image acquired by imaging may be visually recognized by a user.

[0037] In step S110, the control unit 302 determines whether the user has moved their eye away from the eyepiece unit 312 via the eye proximity sensor 313. If the user has not moved their eye away, the process returns to step S108 to determine again whether A<B or A≧B. If the user has moved their eye away, the process proceeds to step S111 to stop outputting the laser light from the light source 303. Then, the control unit 302 proceeds to step S112 to turn off the power of the display device 300 and end the present processing.

[0038] According to this embodiment, even when a user positions the display device 300 in front of the user's eye, the illuminance of the laser light is lowered while the image cannot be visually recognized (the laser light is not incident on the pupil). This makes it possible to avoid constriction of the pupil 306, facilitate adjustment of the position of the display device 300 relative to the eyeball 307 at which the laser light is incident on the pupil 306, and reduce power consumption. When an image can be visually recognized (the laser light is incident on the pupil), the illuminance of the laser light is increased, allowing the user to visually recognize a good quality image.

[0039] Note that step S103 and step S 106In step S107, instead of setting the laser beam intensity to low, or by setting it to low, the frame rate for image rendering may be set to a low frame rate. Alternatively, in step S107, instead of setting the laser beam intensity to high, or by setting it to high, the frame rate may be set to a high frame rate. When a low frame rate is used, the control unit 302 reduces the oscillation speed of the scanning mirror 304 compared to the case of a high frame rate, thereby suppressing power consumption. In this embodiment, a low frame rate is a frame rate in which power consumption is reduced by a predetermined rate or more (for example, 10% or more), i.e., significantly, compared to the case of a high frame rate.

[0040] Furthermore, while the above process switches the laser beam intensity between two levels, low and high, it may be possible to enable switching between more levels or to enable continuous adjustment. [Examples]

[0041] Figure 4 shows the configuration of the display device 500, which is Embodiment 2 of the present invention, as viewed from above. The display device 500 of this embodiment has the same configuration as the display device 300 of Embodiment 1, but without the infrared LED 309, the light splitting element 310, and the pupil sensor 311. Other components common to Embodiment 1 are denoted by the same reference numerals as in Embodiment 1 and are described accordingly.

[0042] Figure 5 shows the process (control method) that the control unit 302 executes according to the computer program in this embodiment.

[0043] The control unit 302 starts this process when the power to the display device 300 is turned ON in response to the user turning ON a power switch (not shown) in step S201.

[0044] In step S202, the control unit 302 sets a predetermined time to be measured while the user is looking at the eyepiece 312. The predetermined time is the time (for example, several tens of seconds) that the user is expected to need to complete the position adjustment of the display device 500 relative to the eyeball 307.

[0045] Next, in step S203, the control unit 302 determines, via the eyepiece sensor 313, whether or not the user is looking at the eyepiece unit 312. If the user is not looking at the eyepiece, the process proceeds to step S216, and, similar to step S114 in Embodiment 1, returns to step S203 without outputting laser light from the light source 303 to determine the eyepiece state again. On the other hand, if the user is looking at the eyepiece, the process proceeds to step S204.

[0046] Alternatively, in step S201, the power to the display device 500 may be turned ON by detecting the eyepiece state through the eyepiece sensor 313.

[0047] In step S204, the control unit 302 starts counting on the eyepiece timer, which measures the eyepiece time, which is the actual elapsed time while the eyepiece is in the eyepiece state. The eyepiece time corresponds to information about the state or position of the eyeball 307 for the display device 500. In this embodiment, the acquisition means is configured by the eyepiece sensor 313 and the control unit 302.

[0048] Next, in step S205, the control unit 302 causes the light source 303 to output laser light. At this time, the control unit 302 controls the light source 303 to reduce the illuminance of the laser light to a low level (i.e., a low emission amount from the light source 303), similar to step S103 in Embodiment 1.

[0049] Subsequently, in step S206, the control unit 302 acquires the eyepiece time measured by the eyepiece timer. The eyepiece time measured by the timer is then defined as C, and the predetermined time set in step S202 is defined as D.

[0050] Next, in step S207, the control unit 302 determines whether C<D (the user has not yet completed adjusting the position of the display device for image viewing) or C≧D (the user has completed adjusting the position of the display device for image viewing). C≧D corresponds to a predetermined condition for image viewing. If the eye-approaching time is still short and there is a possibility that the user has not completed adjusting the position of the display device 500 relative to the eyeball 307 (the predetermined condition is not satisfied), the control unit 302 proceeds to step S217, and maintains low illuminance of the laser light for power saving. Thereafter, the control unit 302 returns to step S206 to acquire C again.

[0051] On the other hand, if sufficient eye-approaching time has elapsed and it is highly likely that the user has completed adjusting the position of the display device 500 relative to the eyeball 307 (the predetermined condition is satisfied), the control unit 302 proceeds to step S208.

[0052] In step S208, the control unit 302 controls the light source 303 to switch the illuminance of the laser light to high illuminance (that is, switch the light emission amount of the light source 303 to a high light emission amount) in order to improve visibility.

[0053] Thereafter, in step S209, the control unit 302 determines whether the user is still in an eye-approaching state via the eye-approaching sensor 313. If the user is not in an eye-approaching state, the control unit 302 proceeds to step S218 to stop the counting of the eye-approaching timer, and further proceeds to step S219 to stop the output of laser light from the light source 303. Then, the process returns to step S203. On the other hand, if the user is in an eye-approaching state, the control unit 302 proceeds to step S210, keeps the illuminance of the laser light at high illuminance, and then proceeds to step S211.

[0054] Note that, in a case where the display device 300 includes an imaging unit that images the external world, or an imaging device that images the external world is connected to the display device 300, after step S109, the imaging unit or the imaging device may be caused to perform imaging, and the image obtained by the imaging may be viewed by the user.

[0055] In step S211, the control unit 302 ends the counting of the eye-approaching timer.

[0056] Next, in step S212, the control unit 302 determines, via the eyepiece sensor 313, whether or not the user has taken their eyes off the eyepiece 312. If the user has not taken their eyes off the eyepiece, the process returns to step S210. If the user has taken their eyes off the eyepiece, the process proceeds to step S213, where the output of the laser light from the light source 303 is stopped. The control unit 302 then proceeds to step S214, where it turns off the power to the display device 300, thus ending this process.

[0057] In this embodiment, the illuminance of the laser light is reduced for a predetermined period of time after the user places the display device 300 in front of their eyes (after placing their eyes on the eyepiece 312). This prevents the pupil 306 from constricting during the predetermined period, making it easier to adjust the position of the display device 300 relative to the eyeball 307 where the laser light enters the pupil 306, while also reducing power consumption. After the predetermined period has elapsed, the illuminance of the laser light is increased to allow the user to view a good image.

[0058] In this embodiment as well, similar to Embodiment 1, the laser beam intensity may be set to a low level in step S205, or it may be set to a low level and the image rendering frame rate may be set to a low frame rate. Alternatively, the laser beam intensity may be set to a high level in step S208, or it may be set to a high level and the frame rate may be set to a high frame rate.

[0059] In this embodiment as well, the illuminance of the laser light may be switched between more than just two levels, low and high, or it may be changed continuously.

[0060] The above embodiments include the following configuration.

[0061] (Composition 1) A display device comprising a light source and a light deflection means for deflecting light from the light source, which enables the viewing of an image by scanning the retina of the user's eyeball with scanning light from the light deflection means, An acquisition means for acquiring information about the eyeball to the display device, A display device characterized by having a control means that, when predetermined conditions for image viewing are not satisfied in the information relating to the eyeball, lowers at least one of the amount of light emitted from the light source and the frame rate of the image compared to when the predetermined conditions are satisfied. (Configuration 2) The display device according to configuration 1, characterized in that the control means lowers at least one of the light emission amount and the image frame rate to a level lower than when the predetermined conditions are satisfied, depending on whether the display device is placed in front of the user's eyes. (Composition 3) The information relating to the eyeball includes information about the pupil of the eyeball and information about the incident position of the scanning light onto the eyeball. The display device according to configuration 1, characterized in that the predetermined condition is that the incident position is located within the pupil. (Composition 4) The information relating to the eyeball is information regarding the time the eyeball is in contact with the display device. The display device according to configuration 1, characterized in that the predetermined condition is that the eyepiece time has elapsed for a predetermined period of time. (Composition 5) The display device according to configuration 1, characterized in that, when the predetermined conditions are not satisfied, the amount of light emitted is such that the rate of pupil contraction of the eyeball into which the scanning light is incident is less than or equal to a predetermined rate. (Composition 6) The display device according to configuration 1, characterized in that the amount of light emitted when the predetermined conditions are not satisfied is an amount of light emitted that causes the power consumption of the display device to decrease by a predetermined percentage or more compared to the amount of light emitted when the predetermined conditions are satisfied. (Composition 7) The display device according to configuration 6, characterized in that the frame rate when the predetermined conditions are not satisfied is a frame rate at which the power consumption of the display device is lower by a predetermined percentage or more than the frame rate when the predetermined conditions are satisfied. (Composition 8) The display device according to any one of configurations 1 to 7, characterized in that the display device is a non-attachable device that is not attached to the user.

[0062] (Other examples) The present invention can also be realized by supplying a program that implements one or more of the functions of the above-described embodiments to a system or device via a network or storage medium, and by having one or more processors in the computer of that system or device read and execute the program. It can also be realized by a circuit (e.g., an ASIC) that implements one or more functions.

[0063] The embodiments described above are merely representative examples, and various modifications and changes can be made to each embodiment when implementing the present invention. [Explanation of Symbols]

[0064] 300,500 display devices 302 Control Unit 303 Light source 304 Polarizing Mirror 306 Pupil 307 Eyeball 308 Retina 311 Pupil sensor 313 Eyepiece Sensor

Claims

1. A display device comprising a light source and a light deflection means for deflecting light from the light source, which enables the viewing of an image by scanning the retina of the user's eyeball with scanning light from the light deflection means, An acquisition means for acquiring information on the pupil of the eyeball and information on the incident position of the scanning light onto the eyeball, The light source has a control means for controlling the amount of light emitted to a first amount of light emitted and a second amount of light emitted that is lower than the first amount of light emitted. The control means is When acquiring the pupil information and the incident position information, the amount of light emitted is controlled to the second amount of light emitted. A display device characterized by controlling the amount of light emitted to the first amount of light emitted when the incident position is within the pupil, based on the acquired pupil information and incident position information.

2. A display device comprising a light source and a light deflection means for deflecting light from the light source, wherein the display device enables the viewing of an image by scanning the retina of the user's eyeball with scanning light from the light deflection means, An acquisition means for acquiring information on the eye contact time during which the eyeball is in contact with the display device, The light source has a control means for controlling the amount of light emitted to a first amount of light emitted and a second amount of light emitted that is lower than the first amount of light emitted. The control means is Before the eye-contact time elapses for a predetermined time to allow the user to adjust the position of the display device relative to the eyeball, the amount of light emitted is controlled to the second amount of light emitted. A display device characterized in that, after the eyepiece time has elapsed for the predetermined time, the amount of light emitted is controlled to a first amount of light emitted.

3. The display device according to claim 1 or 2, characterized in that the control means controls the amount of light emitted to the second amount of light emitted in accordance with the fact that the display device is placed in front of the user's eyes.

4. The display device according to claim 1 or 2, characterized in that the second amount of light emitted is such that the rate of pupil contraction of the eyeball into which the scanning light is incident is less than or equal to a predetermined rate.

5. The display device according to claim 4, characterized in that the second amount of light emitted is such that the power consumption of the display device decreases by a predetermined percentage or more compared to the first amount of light emitted.

6. The display device according to claim 1, characterized in that when the control means controls the amount of light emitted to the second amount of light emitted, it lowers the frame rate of the image compared to when the amount of light emitted is the first amount of light emitted.

7. The display device according to claim 1 or 2, characterized in that the display device is a non-attachable device that is not attached to the user.

8. A control method for a display device comprising a light source and a light deflection means for deflecting light from the light source, wherein the user can view an image by scanning the retina of their eyeball with scanning light from the light deflection means, The steps include obtaining information about the pupil of the eyeball and information about the position where the scanning light is incident on the eyeball, The method includes a step of controlling the amount of light emitted from the light source to a first amount of light emitted and a second amount of light emitted that is lower than the first amount of light emitted. In the step of controlling the amount of light emitted, When acquiring the pupil information and the incident position information, the amount of light emitted is controlled to the second amount of light emitted. A control method characterized by controlling the amount of light emitted to the first amount of light emitted when the incident position is within the pupil, based on the acquired pupil information and incident position information.

9. A control method for a display device comprising a light source and a light deflection means for deflecting light from the light source, wherein the user can view an image by scanning the retina of their eyeball with scanning light from the light deflection means, The steps include obtaining information on the eye contact time while the eyeball is in contact with the display device, The method includes a step of controlling the amount of light emitted from the light source to a first amount of light emitted and a second amount of light emitted that is lower than the first amount of light emitted. In the step of controlling the amount of light emitted, Before the eye-contact time elapses for a predetermined time to allow the user to adjust the position of the display device relative to the eyeball, the amount of light emitted is controlled to the second amount of light emitted. A control method characterized in that, after the eyepiece time has elapsed for the predetermined time, the amount of light emitted is controlled to a first amount of light emitted.

10. A program characterized by causing a computer to perform processing according to the control method described in claim 8 or 9.

Images