JP2008089934A - Image display device and method of controlling luminance of image of the image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device in which the luminance of a displayed image is increased without increasing the light quantity of a light source and the adjustment range of the luminance is broadened, and the increase in the power consumption of the image display is prevented when the luminance of the image is increased, and to provide a method of controlling the luminance. <P>SOLUTION: The image display device has: an optical scanning part which displays the image by two-dimensionally scanning a luminous flux generated on the basis of an image signal; and a control part which controls the operation of the optical scanning part, wherein the control part adjusts the luminance of the image to be displayed by controlling the optical scanning part to vary the scanning angle of the luminous flux when adjusting the luminance of the image to be displayed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display apparatus and an image luminance adjustment method using the apparatus, and more particularly, to an image display apparatus and an apparatus for displaying an image by two-dimensionally scanning a light beam generated based on an image signal. The present invention relates to an image brightness adjustment method.

  2. Description of the Related Art Conventionally, an image display apparatus that displays an image by two-dimensionally scanning a light beam generated based on an image signal is known.

  As this type of image display device, a projection-type image display device that projects and displays an image on a screen by two-dimensionally scanning a light beam generated based on the image signal on the screen, or the image signal There is a retinal scanning image display device that scans a light beam generated based on the two-dimensionally and guides it to the user's eyes to form an image on the retina.

  Since these image display devices display images by scanning a light beam on a screen, retina, or the like, compared to self-luminous image display devices such as liquid crystal displays and CRT (Cathode Ray Tube) displays. Depending on the external environment (brightness), it may be difficult for the user to see the image.

  Specifically, when the brightness of the image to be displayed is set to such an extent that the user feels easy to see where the external environment is relatively dark, the display is displayed to the user when the external environment becomes bright due to the passage of time or weather changes. If the brightness of the displayed image is set so that the user feels easy to see where the external environment is relatively dark and the external environment becomes dark, it will be difficult for the user to see. The displayed image is dazzled and difficult to see.

  For this reason, an image display device that scans such a light beam and displays an image usually has a brightness adjustment function.

As an image display device equipped with this brightness adjustment function, in order to reduce the brightness of the image to be displayed, a transmittance variable filter capable of changing the light transmittance is disposed between the light source and the retina, and the light amount of the light source is reduced. A retinal scanning type image display device has been devised that adjusts the luminance of the image to be displayed by changing the light transmittance of the transmittance variable filter without changing (see, for example, Patent Document 1). .)
Japanese Patent Laid-Open No. 2004-233908

  However, the conventional image display device is configured to adjust the luminance of the image to be displayed by changing the light transmittance of the transmittance variable filter disposed between the light source and the retina. The maximum value of the luminance of the image to be performed is limited to the maximum light amount of the light source, and there is a possibility that the luminance adjustment range becomes relatively narrow.

  That is, the conventional image display device is configured to maximize the luminance of the image by scanning the light flux without using the variable transmittance filter, or maximizing the transmittance of the variable transmittance filter. For this reason, when the light amount of the light source is maximized, the luminance of the image cannot be further increased, and the luminance adjustment range may be relatively narrow.

  If the configuration is such that the light quantity of the light source can be increased, the brightness adjustment range can be expanded. However, if this is done, the power consumption of the light source will increase and the power consumption of the image display device will increase. Will increase.

  Therefore, the present invention according to claim 1 includes an optical scanning unit that displays an image by two-dimensionally scanning a light beam generated based on an image signal, and a control unit that controls the operation of the optical scanning unit. In the image display device, the control unit adjusts the luminance of the image to be displayed by controlling the optical scanning unit to change the scanning angle of the light beam.

  According to a second aspect of the present invention, in the image display device according to the first aspect of the present invention, the image display apparatus has a light beam output unit that outputs a light beam, and the control unit outputs the light beam with the maximum output. In this state, the brightness of the image to be displayed is increased by controlling the optical scanning unit to reduce the scanning angle of the light beam.

  According to a third aspect of the present invention, in the image display device according to the first or second aspect, the control unit includes an output state change detection unit that detects a change in the output state of the light flux by the light output unit. And the brightness of the image to be displayed is kept constant by controlling the optical scanning unit to change the scanning angle of the light beam in accordance with the detection result of the output state change detection unit.

  Moreover, in this invention which concerns on Claim 4, in the image display apparatus of any one of Claims 1-3, an optical scanning part is a 1st optical scanning part which reciprocates and scans a light beam in a 1st direction, A second optical scanning unit that reciprocally scans the light beam in a second direction different from the first direction, and the control unit controls the first light scanning unit or the second light scanning unit to change a scanning angle of the light beam. Thus, the brightness of the image to be displayed is adjusted.

  Moreover, in this invention which concerns on Claim 5, in the image display apparatus of any one of Claims 1-3, an optical scanning part is a 1st optical scanning part which reciprocatesly scans a light beam in a 1st direction, A second optical scanning unit that reciprocally scans the light beam in a second direction that intersects the first direction, and the control unit controls the first light scanning unit and the second light scanning unit to change a scanning angle of the light beam. This is characterized in that the brightness of the image to be displayed is adjusted.

  Further, in the present invention according to claim 6, in the image display device according to claim 5, the control unit controls the first light scanning unit and the second light scanning unit to change the scanning angle of the light flux at the same rate. Thus, the brightness of the image to be displayed is adjusted.

  Moreover, in this invention which concerns on Claim 7, in the image display apparatus of any one of Claims 1-6, a control part is the brightness | luminance of the image to display, and the scanning angle of the light beam by an optical scanning part. A correspondence table storage unit that stores a correspondence table corresponding to each other is provided, and brightness of an image to be displayed is adjusted using the correspondence table.

  Moreover, in this invention which concerns on Claim 8, in the image display apparatus of any one of Claims 1-7, it has an operation part operated in order to change the scanning angle of a light beam to an optical scanning part, The control unit controls the optical scanning unit to change the scanning angle of the light beam according to the operation of the operation unit.

  Further, in the present invention according to claim 9, in the image display device according to claim 8, the operation unit has a switch capable of changing the scanning angle of the light beam by the optical scanning unit in a plurality of stages for each external situation. It is characterized by.

  According to a tenth aspect of the present invention, in the image display device according to any one of the first to ninth aspects, the image display apparatus includes a luminance sensor that detects the brightness of the outside world, and the control unit detects the luminance sensor. According to the result, the optical scanning unit is controlled to change the scanning angle of the light beam.

  Moreover, in this invention which concerns on Claim 11, the image display apparatus of any one of Claims 1-10 scans a light beam in a two-dimensional direction with an optical scanning part, and uses the scanned light to eyes. It is a retinal scanning image display device that forms an image on a guiding retina.

  Moreover, in this invention which concerns on Claim 12, the image display apparatus of any one of Claims 1-10 is a screen by scanning a light beam in a two-dimensional direction with an optical scanning part, and projecting on a screen. It is a projection type image display device that displays an image on it.

  The invention according to claim 13 includes an optical scanning unit that displays an image by two-dimensionally scanning a light beam generated based on an image signal, and a control unit that controls the operation of the optical scanning unit. In the image luminance adjustment method by the image display device, the luminance of the image to be displayed is adjusted by changing the scanning angle of the light beam by the optical scanning unit.

  According to the first or thirteenth aspect of the present invention, the luminance of the image to be displayed can be increased without increasing the light amount of the light source. It is possible to prevent the power consumption of the image display device from increasing when the luminance is increased.

  Further, in the present invention according to claim 2, since the outside world is very bright, the displayed image cannot have sufficient luminance even though the light output unit outputs the light flux with the maximum output. Even in this case, the brightness of the display image can be further increased by reducing the scanning angle of the light beam, so that an image display device that can be used even in a very bright place can be provided.

  According to the third aspect of the present invention, the luminance of the image to be displayed is reduced while reducing the power output of the image display device by reducing the output of the light beam by the light output unit and reducing the scanning angle of the light beam. Can be kept constant without lowering. In addition, when the power source of the image display device is a battery, even if the supplied voltage is reduced due to a decrease in the remaining battery power, the brightness of the image to be displayed can be kept constant, so that the brightness is constant. It is possible to provide an image display device that can be used for a relatively long time while maintaining the above.

  Further, in the present invention according to claim 4, the luminance of the image to be displayed can be adjusted by changing the scanning angle of the light beam only in one of the first optical scanning unit and the second optical scanning unit. In addition, it is possible to reduce the processing load of the control unit for brightness adjustment.

  In the present invention according to claim 5, it is possible to adjust the amount of deformation of the image by adjusting the luminance.

  Further, in the present invention according to claim 6, since the change rate of the scanning angle of the light beam by the first optical scanning unit is equal to the change rate of the scanning angle of the light beam by the second optical scanning unit, luminance adjustment is performed. Therefore, it is possible to reliably prevent the image from being deformed.

  In the present invention according to claim 7, since the control unit performs control to change the scanning angle of the light beam by the optical scanning unit with reference to the correspondence table, the processing load on the control unit when performing luminance adjustment can be reduced. it can.

  In the present invention according to claim 8, the user can adjust the luminance of the image to be displayed to a desired luminance by scanning the scanning unit.

  In the present invention according to claim 9, the brightness of an image to be displayed can be easily adjusted so as to be a brightness suitable for the external environment only by operating a switch.

  According to the tenth aspect of the present invention, the luminance of an image to be displayed can be automatically adjusted according to the brightness of the outside world, so that the luminance can be easily adjusted without requiring a complicated operation.

  According to the eleventh aspect of the present invention, a retinal scanning image display apparatus capable of expanding the brightness adjustment range and preventing an increase in power consumption of the image display apparatus when increasing the brightness of the image. Can be provided.

  In the present invention according to claim 12, there is provided a projection type image display apparatus capable of expanding a brightness adjustment range and preventing an increase in power consumption of the image display apparatus when increasing the brightness of the image. Can be provided.

  Hereinafter, an embodiment of an image display device according to the present invention will be described with reference to the drawings. In this embodiment, the image display device is an image display device that is used on the user's head as the image display device. The light beam generated based on the image signal is scanned two-dimensionally and scanned. A retinal scanning head-mounted display (hereinafter referred to as “HMD: Head Mount Display”) that guides light to the user's eyes and forms an image on the retina will be described as an example. The present invention is not limited, but for a projection-type image display device such as a laser projector that projects and displays an image on a screen by two-dimensionally scanning a light beam generated based on an image signal on the screen. Can also be applied.

  FIG. 1 is an explanatory view showing an example of image brightness adjustment by the image display device according to the present embodiment, FIG. 2 is an external perspective view showing the image display device according to the present embodiment, and FIG. FIG. 4 is an explanatory diagram illustrating an operation input unit of the image display apparatus according to the present embodiment, FIG. 4 is a functional block diagram illustrating an electrical configuration of the image display apparatus according to the present embodiment, and FIG. 5 illustrates an image to be displayed. FIG. 6 and FIG. 7 are flowcharts showing processing performed by the control unit of the image display apparatus according to the present embodiment.

(Outline of brightness adjustment by image display device)
The HMD that is an image display device according to the present embodiment is a device for viewing an image such as video content while being worn on the head of a user, and a light beam obtained by modulating an image signal is applied to at least one retina of the user. An optical scanning unit that projects and displays an image by two-dimensional scanning (projection display) and a control unit that controls the operation of the optical scanning unit are provided.

  In particular, the HMD is configured such that the brightness of an image to be displayed is adjusted by the control unit performing control to cause the optical scanning unit to change the scanning angle of the light beam.

  That is, the control unit does not increase the light amount of the light beam, but increases the light amount of the light beam when the image luminance is increased from the low luminance state where the image is displayed at a relatively low luminance to the high luminance state. The brightness of an image to be displayed is increased by scanning the light beam at a scanning angle smaller than the scanning angle of the light beam in a low luminance state while keeping the constant.

  Specifically, in the low luminance state, as shown in FIG. 1A, the control unit displays the low luminance image V1 by two-dimensionally scanning the light beam at a relatively large scanning angle. Yes.

  Then, when changing the low-brightness state to the high-brightness state, the control unit makes the light scanning angle smaller than that in the low-brightness state, thereby scanning the light flux as shown in FIG. By reducing the range and increasing the amount of light beam scanned per unit time in the reduced scanning range on the retina, a high-brightness image V2 is displayed in which the image area is slightly reduced compared to that in the low-brightness state. I am doing so.

  As described above, the HMD of the present embodiment is configured not to increase the light amount of the light beam but to increase the luminance of the displayed image by reducing the scanning angle of the light beam while keeping the light amount of the light beam constant. Therefore, it is not necessary to increase the amount of light flux in order to increase the luminance of the image, and the power consumption of the HMD can be reduced.

  In addition, since the scanning angle of the light beam is made smaller in the high luminance state than in the low luminance state, the driving power of the optical scanning unit can be reduced, thereby reducing the power consumption of the HMD.

  Even in the state where the maximum amount of light beam is set, if the scanning angle of the light beam is reduced in that state, the brightness of the image to be displayed can be further increased. Can be extended.

  Specifically, in the case of a see-through HMD that can see the scenery of the outside world together with the display image, the luminous flux output unit that outputs the luminous flux will have a maximum output when used in a place where the intensity of the external light is very strong. Even when the light beam is being output, the user may feel the outside light dazzling, and the light amount scanned by the light scanning unit may be insufficient and the display image may appear dark and difficult to see.

  However, since the HMD of the present embodiment is configured as described above, in a state where the light beam output unit that outputs the light beam outputs the light beam with the maximum output, the control unit causes the light beam scanning unit to scan the light beam with a scanning angle. By controlling to reduce the brightness of the image to be displayed, the brightness of the image to be displayed can be further increased. Therefore, it is possible to suitably prevent the displayed image from becoming difficult to see even when used in a very bright place.

  In addition, the control unit of the HMD includes an output state change detection unit that detects a change in the output state of the light beam by the light output unit, and the light beam scanning unit receives a light beam according to the detection result of the output state change detection unit. By controlling to change the scanning angle, the brightness of the image to be displayed is kept constant.

  For this reason, in this HMD, the output of the light beam from the light output unit is reduced and the scanning angle of the light beam is reduced, thereby reducing the power consumption of the image display device and without reducing the brightness of the image to be displayed. Can be kept constant.

  The output state change detection unit detects a change in the drive voltage of the light output unit supplied to the light output unit by detecting a change in the power supply voltage of the HMD, and outputs the light output unit based on the detection result. It is configured to indirectly detect a change in the state (the amount of light flux).

  By configuring the output state change detection unit in this way, for example, when the power supply of the HMD is a battery, the brightness of the image to be displayed even if the remaining battery level decreases and the voltage supplied to the light output unit decreases. Therefore, it is possible to provide an image display device that can be used for a relatively long time while maintaining a constant luminance.

  Here, the output state change detection unit is provided in the control unit. However, the present invention is not limited to this, and the output state change detection unit may be provided independently of the control unit.

  Here, the output state change detection unit is configured to indirectly detect the change in the output state of the light flux by the light output unit based on the change in the power supply voltage of the HMD, but the invention is limited to this. Instead, the change in the output state of the light output unit may be detected directly.

  For example, the output state change detection unit includes laser drivers 31, 32, and 33 (see FIG. 4) included in a light source unit 30 that functions as a light output unit, and lasers 34, 35, and 36 (see FIG. 4) that are described later. ) To detect a change in the output state of the light output unit, and lasers 34, 35, and 36 described later (see FIG. 4). It is also possible to provide a luminance sensor that detects a change in the luminance of the luminous flux output from the light source, and to detect a change in the output state of the light source unit 30 (see FIG. 4) that functions as a light output unit. .

  Further, in the example shown in FIG. 1B, in the two-dimensional scanning of the light flux, the deterioration of the image quality of the display image is prevented by reducing both the horizontal and vertical scanning angles at the same rate. However, by reducing only the vertical scanning angle in the two-dimensional scanning of the luminous flux, the luminance of the image to be displayed is increased while reducing the processing load of the control unit when performing luminance adjustment. It can also be done.

  That is, in the two-dimensional scanning of the luminous flux, only the scanning angle in the vertical direction is reduced while maintaining the scanning angle in the low luminance state without changing the scanning angle in the horizontal direction. As shown in FIG. 5, a high-luminance image V3 is displayed in which the luminance is increased by slightly reducing only the vertical direction of the display screen.

  If such brightness adjustment is performed, the control unit does not need to change the horizontal scanning angle of the light beam, so that the processing load performed to change the display image from the low brightness state to the high brightness state is reduced. The time required for adjustment can be shortened.

  However, when the brightness of an image to be displayed is increased by reducing only the vertical scanning angle of the luminous flux in this way, the image to be displayed is set in order to make the vertical / horizontal scale ratio of the image the same as in the low-luminance state. Is compressed in the horizontal direction, and light is not output during scanning of the light flux in the non-display area V4 shown in FIG.

  By doing so, it is possible to prevent deterioration of the image due to the increase in luminance and to stop the output of light when the optical scanning unit scans the non-display area V4 in FIG. Can be reduced.

  In addition, when the scanning angle of the light beam is changed in order to change the luminance of the image to be displayed, the image content may be changed according to the change in the scanning angle.

  For example, if the scanning angle of the light beam is reduced to increase the brightness of the image to be displayed, the image to be displayed may be reduced, making it difficult to see characters or the like. In such a case, the image displayed by the control unit It is possible to prevent the display image from becoming difficult to see by performing processing such as deleting the outer (outer frame) portion of the image.

(Description of the outline of the image display device)
Next, an outline of the HMD that enables the brightness adjustment as described above will be described.

  As shown in FIG. 2, the HMD 1 of the present embodiment is formed integrally with a housing 3 in which a retinal scanning image display device is housed, a support frame 4 that supports the housing 3, and the support frame 4. And a head mounting portion 5 for mounting the HMD 1 on the user's head.

  The housing 3 has a storage space in which the retinal scanning image display device can be stored. The housing 3 is arranged in a plan view so as to cover the left eye portion and the left temple portion of the user when the head is worn. It is composed of an L-shaped box.

  A luminance sensor 2 for detecting the brightness (luminance) of the outside world is provided at a predetermined position on the top surface 3b of the housing 3.

  In addition, the housing 3 has a substantially rectangular front surface 3a that forms the forefront portion of the housing 3 in a state where the HMD 1 is mounted on the head, and a plan view that forms the uppermost portion of the housing 3. The substantially L-shaped top surface 3b is joined by an inclined surface 3c inclined from the top surface 3b toward the front surface 3a.

  And the operation input part 6 which performs various functions of HMD1 by the user operating on this inclined surface 3c is provided. The operation input unit 6 is provided with a plurality of switches operated by the user.

  Specifically, as shown in FIG. 3, the reproduction switch 6a operated to start the reproduction of the image by the HMD 1, the stop switch 6b operated to stop the reproduction of the image, and the luminance of the image to be displayed. And a luminance adjusting unit 7 provided with a plurality of switches operated for adjustment. For the sake of simplicity, illustration of switches that are operated to execute other functions of the HMD 1 such as fast-forwarding and rewinding of images is omitted here.

  In particular, the brightness adjustment unit 7 selects an auto mode for automatically adjusting the brightness of an image to be displayed to a brightness that the user feels easy to see based on the brightness of the outside world detected by the brightness sensor 2. An auto mode switch 7a to be operated is provided.

  The auto mode switch 7a is a push-type button switch. When the auto mode switch 7a is pressed, the auto mode is selected, and when the auto mode switch 7a is not pressed, or the auto mode is selected. When the auto mode switch is pressed again while being operated, the manual mode for manually adjusting the brightness of the image is selected.

  In addition, the brightness adjustment unit 7 includes a day / night switch 7b, a rain / rain switch 7c, and an indoor / outdoor switch which are operated to adjust the brightness of an image displayed by the user when the manual mode is selected. A changeover switch 7d and an arbitrary changeover switch 7e are provided.

  The day / night selector switch 7b is a slide type switch that can be slid up and down. The day mode is selected by sliding the day / night selector switch 7b upward, and the night mode is selected by sliding downward. Is selected. It should be noted that in a state where neither the upper nor lower slide operation is performed, neither the day mode nor the night mode is selected.

  Here, the daytime mode is a mode in which the brightness of the image to be displayed is set to a predetermined highest level that the user can easily see during the daytime when the brightness of the outside world is relatively bright, and the night mode is This is a mode in which the brightness of an image to be displayed is set to a predetermined minimum brightness level at which the user feels easy to see at night when the brightness of the outside world is relatively dark.

  Also, the clear / rain switch 7c is a slide type switch that can be slid up and down, and the clear / sun mode is selected by sliding the clear / rain switch 7c upward, and by sliding downward. Rain mode is selected. It should be noted that neither the clear sky mode nor the rainy weather mode is selected when the slide operation is not performed in any direction.

  Here, the clear sky mode is a relatively high brightness that is determined in advance so that the user can easily see the brightness of the displayed image when the brightness of the outside world is relatively bright. The mode is set to a lower level of brightness. Rain mode is a relatively low brightness that is determined in advance so that the user can easily see the brightness of the displayed image when the brightness of the outside world is relatively dark. In this mode, the luminance is set one level higher than the lowest level.

  The indoor / outdoor switch 7d is a slide-type switch that can be slid up and down. By sliding the indoor / outdoor switch 7d upward, the outdoor mode is selected and the slide operation is performed downward. Thus, the indoor mode is selected. Note that neither the outdoor mode nor the indoor mode is selected when the slide operation is not performed in any direction.

  Here, the outdoor mode is a predetermined relatively high brightness that makes it easy for the user to see the brightness of an image to be displayed in a room where the brightness of the outside world is relatively bright, and is one step lower than the clear sky mode. The indoor mode is a mode in which the brightness of an image to be displayed is set to be relatively low so that the user can easily see the brightness in the room where the brightness of the outside world is relatively dark. In this mode, the brightness is set one step higher than that.

  In other words, the day / night selector switch 7b, the rain / rain selector switch 7c, the indoor / outdoor selector switch 7d, and the arbitrary selector switch 7e are switches that can change the scanning angle of the light beam by the optical scanning unit, which will be described in detail later, in a plurality of stages for each external environment. It functions as.

  As described above, the HMD 1 of the present embodiment includes a plurality of brightness adjustment switches, that is, the day / night switch 7b, the rain / rain switch 7c, and the indoor / outdoor switch 7d, and these switches are operated alone or in combination. As a result, the brightness of the image can be adjusted so that the brightness is felt most easily by the user according to the location, time, weather, and the like when displaying the image.

  The optional switch 7e is a dial switch that can be rotated. By rotating the optional switch 7e clockwise or counterclockwise, the brightness selected from the above six levels can be obtained. Further adjustments can be made.

  Further, the support frame 4 is a goggle-type support body having the same shape as the front part of the glasses. In this embodiment, when the HMD 1 is mounted on the head, the support frame 4 is formed on a portion facing the left eye of the user. A housing 3 is attached.

  The support frame 4 is configured such that when the HMD 1 is mounted on the head, a portion facing the user's right eye is formed of a translucent member so that the user can view the image with the HMD 1. Even so, you can see the surrounding situation.

  For this reason, the user can view the image while wearing the HMD1 while walking, etc., and when used in a relatively bright place such as outdoors, the user is supported by a translucent member. Even if external light enters from the frame 4 to the housing 3 side, the brightness of the image can be suitably adjusted by operating the various switches 7b to 7e of the brightness adjusting unit 7 as described above. Regardless of the time and place, it is possible to appreciate images that are always optimally brightness adjusted.

  The support frame 4 includes a notch 4a having a substantially trapezoidal shape in front view between a portion facing the left eye of the user and a portion facing the right eye of the user. When mounting on the head, the notch 4a is hooked on the user's nose.

  The head mounting portion 5 is configured by a member having a shape similar to that of a temple of glasses, the base end side of which is rotatably attached to both upper ends of the goggle-type support body, When the HMD 1 is mounted on the head, it is curved so that it can be hooked on the user's ear.

  When using the HMD 1, the user hooks the notch 4 a of the support frame 4 on the nose and hooks the curved portion on the terminal side of the head mounting portion 5 on both ears. The HMD 1 is supported at three points, the ear and the nose, and the housing 3 is mounted on the head so as to be positioned in front of the left eye, and then an image such as video content is viewed by operating the operation input unit 6. .

(Description of electrical configuration of image display device)
Next, the electrical configuration and the like of the HMD 1 of the present embodiment will be described with reference to FIGS. 4 and 5.

  As shown in FIG. 4, the HMD 1 controls the overall operation of the HMD 1 and reads out a video signal supplied from the control unit 110 for each dot clock and modulates the intensity according to the read video signal. A light beam generation unit 20 that generates and emits the generated light beam, and is generated by the light beam generation unit 20 between the light beam generation unit 20 and the user's eye E, and is emitted through the optical fiber 100. A collimated optical system 61 that collimates the laser beam (hereinafter referred to as “light beam”) to be collimated, and the light beam collimated by the collimating optical system 61 in the horizontal direction (first direction) for image display. A horizontal scanning unit 70 functioning as a first light scanning unit that reciprocally scans in the horizontal direction, and a second light that reciprocates in the vertical direction (second direction different from the first direction) a light beam scanned in the horizontal direction by the horizontal scanning unit 70 Scan section Functioning as the vertical scanning unit 80, the relay optical system 75 provided between the horizontal scanning unit 70 and the vertical scanning unit 80, and the light beam thus scanned in the horizontal direction and the vertical direction are emitted to the pupil Ea. A relay optical system 90 is provided.

  In the present embodiment, the horizontal scanning unit 70, the relay optical system 75, the vertical scanning unit 80, and the relay optical system 90 scan the light beam generated based on the image signal in a two-dimensional manner. This corresponds to the optical scanning unit to be displayed.

  The light beam generation unit 20 receives an image signal supplied from an external device such as a personal computer (not shown), and generates a signal that is an element for synthesizing an image based on the image signal. A circuit 21 is provided. In the signal processing circuit 21, blue (B), green (G), and red (R) image signals 22a to 22c are generated and output. The signal processing circuit 21 outputs a horizontal drive signal 23 used in the horizontal scanning unit 70 and a vertical drive signal 24 used in the vertical scanning unit 80, respectively.

  Further, the light beam generation unit 20 includes a light source unit 30 that functions as a light beam output unit that converts the three image signals (B, R, G) 22a to 22c output for each dot clock from the signal processing circuit 21 into light beams, and A light combining unit 40 is provided for combining these three light beams into one light beam to generate an arbitrary light beam.

  The light source unit 30 includes a B laser 34 that generates a blue light beam and a B laser driver 31 that drives the B laser 34, a G laser 35 that generates a green light beam, a G laser driver 32 that drives the G laser 35, and a red color. And an R laser driver 33 for driving the R laser 36. Each of the lasers 34, 35, and 36 can be configured as, for example, a semiconductor laser or a solid-state laser with a harmonic generation mechanism. When a semiconductor laser is used, the drive current can be directly modulated to modulate the intensity of the light beam. However, when a solid-state laser is used, each laser is equipped with an external modulator to modulate the intensity of the light beam. There is a need.

  The light combining unit 40 includes collimating optical systems 41, 42, and 43 provided to collimate a light beam incident from the light source unit 30 into parallel light, and dichroic mirrors 44, 45, and 46 for combining the collimated light beam. And a coupling optical system 47 that guides the combined light flux to the optical fiber 100.

  Laser beams emitted from the lasers 34, 35, and 36 are collimated by collimating optical systems 41, 42, and 43, and then enter the dichroic mirrors 44, 45, and 46. Thereafter, these dichroic mirrors 44, 45, and 46 selectively reflect and transmit each light beam with respect to the wavelength.

  Specifically, the blue light beam emitted from the B laser 34 is collimated by the collimating optical system 41 and then enters the dichroic mirror 44. The green light beam emitted from the G laser 35 enters the dichroic mirror 45 through the collimating optical system 42. The red light beam emitted from the R laser 36 enters the dichroic mirror 46 through the collimating optical system 43.

  The three primary color beams incident on the three dichroic mirrors 44, 45, 46 are reflected or transmitted in a wavelength selective manner, reach the coupling optical system 47, and are collected and output to the optical fiber 100.

  The horizontal scanning unit 70 and the vertical scanning unit 80 scan in the horizontal direction and the vertical direction to form a scanning light beam so that the light beam incident from the optical fiber 100 can be projected as an image.

  The horizontal scanning unit 70 has a resonance type deflection element 71 having a deflection surface for scanning the light beam in the horizontal direction, and a drive signal for causing the resonance type deflection element 71 to resonate and swing the deflection surface of the resonance type deflection element 71. Based on the horizontal scanning drive circuit 72 as the drive signal generator to be generated and the displacement signal output from the resonance type deflection element 71, the oscillation range of the deflection surface of the resonance type deflection element 71 and the oscillation frequency etc. A horizontal scanning angle detection circuit 73 for detecting the state and a temperature detection unit 74 for detecting the temperature of the resonance type deflection element 71 are provided. The temperature detection unit 74 detects the temperature of the resonant deflection element 71, and detects the temperature of the resonant deflection element 71 by detecting the temperature around the resonant deflection element 71. It may be.

  In particular, the horizontal scanning angle detection circuit 73 inputs a signal indicating the detected oscillation state of the resonance type deflection element 71 to the control unit 110.

  The vertical scanning unit 80 includes a deflection element 81 for scanning a light beam in the vertical direction, a vertical scanning control circuit 82 for driving the deflection element 81, and a swing range and a swing frequency of the deflection surface. And a vertical scanning angle detection circuit 83 for detecting a swinging state of the like.

  Further, the horizontal scanning drive circuit 72 and the vertical scanning control circuit 82 are driven based on the horizontal synchronizing signal 23 and the vertical synchronizing signal 24 output from the signal processing circuit 21, respectively, and the vertical scanning angle detecting circuit 83 detects the detected deflection. A signal indicating the swinging state of the element 81 is input to the control unit 110.

  The control unit 110, which will be described in detail later, controls the operation of the signal processing circuit 21 and adjusts the horizontal drive signal 23 and the vertical drive signal 24 to thereby adjust the horizontal scanning unit 70 and the vertical scanning unit 80. The brightness of the image to be displayed is adjusted by changing the scanning angle of the light beam.

  The scanning angle thus changed is detected by the control unit 110 based on detection signals from the horizontal scanning angle detection circuit 73 and the vertical scanning angle detection circuit 83, and is horizontally driven via the signal processing circuit 21 and the horizontal scanning drive circuit 72. It is fed back to the signal 23 and also fed back to the vertical drive signal 24 via the signal processing circuit 21 and the vertical scanning control circuit 82.

  In addition, a relay optical system 75 that relays a light beam between the horizontal scanning unit 70 and the vertical scanning unit 80 is provided, and the light scanned in the horizontal direction by the resonant deflection element 71 passes through the relay optical system 75. Then, the beam is scanned in the vertical direction by the deflecting element 81 and emitted to the relay optical system 90 as a scanning beam.

  The relay optical system 90 includes lens systems 91 and 94 having a positive refractive power. The display scanning light beams emitted from the vertical scanning unit 80 are converted into convergent light beams by the lens system 91 so that the respective light beams have their center lines parallel to each other. The lens system 94 converts the light beams into substantially parallel light fluxes, and the center line of these light fluxes is converged on the pupil Ea of the user.

  In this embodiment, the light beam incident from the optical fiber 100 is scanned in the horizontal direction by the horizontal scanning unit 70 and then scanned in the vertical direction by the vertical scanning unit 80. The arrangement with the vertical scanning unit 80 may be exchanged, and after the vertical scanning unit 80 scans in the vertical direction, the horizontal scanning unit 70 may scan in the horizontal direction.

  The control unit 110 includes a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, and a RAM (Random Access Memory) 103.

  The CPU 101, the ROM 102, and the RAM 103 are connected to a data communication bus, and various information is transmitted and received through the data communication bus.

  The control unit 110 is connected to the operation input unit 6 operated by the user and the luminance sensor 2 that detects the brightness (luminance) of the outside world.

  The CPU 101 is an arithmetic processing unit that operates various circuits (not shown) constituting the HMD 1 by executing various programs stored in the ROM 102 and executes various functions provided in the HMD 1.

  The ROM 102 is an image reproduction program for operating the light beam generation unit 20, the horizontal scanning unit 70, the vertical scanning unit 80, and the like when the HMD 1 performs image reproduction, stop, fast forward, rewind, and the like. Various types of control executed by the CPU 101 for the control unit 110 to control the entire operation of the HMD 1 such as a luminance adjustment program for operating the optical scanning unit such as the horizontal scanning unit 70 and the vertical scanning unit 80 when adjusting the luminance. It functions as a program storage means for storing a program.

  The ROM 102 stores a plurality of correspondence tables to be referred to when adjusting the luminance of the image displayed by the control unit 110, and associates the luminance of the image to be displayed with the scanning angle of the light beam by the optical scanning unit. It functions as correspondence table storage means for storing the correspondence table.

  FIG. 5 is an explanatory diagram showing one of a plurality of correspondence tables stored in the ROM 102. As shown in FIG. 5, the correspondence table includes an angle of view (scanning angle) when the horizontal scanning unit 70 and the vertical scanning unit 80 scan the light beam, and an image displayed when the light beam is scanned at the scanning angle. Is a table in which the luminance values are associated with each other.

The correspondence table shown in FIG. 5 is obtained when the light beam is scanned by setting the rotation angle of the resonant deflection element 71 included in the horizontal scanning unit 70 and the rotation angle of the deflection element 81 included in the vertical scanning unit 80 to 5 degrees. The brightness of the displayed image is 900 (Cd: candela / m ² ), and the rotation angle of the resonance type deflection element 71 included in the horizontal scanning unit 70 and the rotation angle of the deflection element 81 included in the vertical scanning unit 80 are 10 degrees. When the light beam is scanned, the brightness of the displayed image is 400 (Cd / m ² ), the rotation angle of the resonance type deflection element 71 provided in the horizontal scanning unit 70, and the deflection element provided in the vertical scanning unit 80 It is shown that the brightness of the displayed image is 100 (Cd / m ² ) when the light beam is scanned with the rotation angle of 81 being 15 degrees.

  The correspondence table shown in FIG. 5 is a correspondence table that is referred to by the control unit 110 when the user operates the day / night switch 7b.

  Then, when the day mode is selected by the user, the control unit 110 refers to the correspondence table and controls the optical scanning unit to scan the light beam at a scanning angle of 5 degrees, and the user selects the night mode. In this case, the optical scanning unit is controlled to scan the light beam at a scanning angle of 15 degrees. When the user does not select either the day mode or the night mode, the control unit 110 controls the optical scanning unit to scan the light beam at a scanning angle of 10 degrees as a basic setting.

  The RAM 103 is temporary storage means used as a work area when the CPU 101 executes various programs stored in the ROM 102.

  The RAM 103 temporarily stores image information corresponding to video content or the like input from an external device via an interface unit (not shown), and the control unit 110 when displaying an image with the HMD 1. Reads out the image information temporarily stored in the RAM 103 and displays the image.

  As described above, the control unit 110 of the HMD 1 configured as described above scans the light beam at at least one of the horizontal scanning unit 70 that is the first scanning unit and the vertical scanning unit 80 that is the second optical scanning unit. The brightness of the image to be displayed is adjusted by performing control to change the.

  That is, when the user operates various switches 7a to 7e provided in the brightness adjusting unit 7 in order to adjust the brightness of the image, the control unit 110 executes the brightness adjusting program stored in the ROM 102. With reference to the correspondence table, the resonance type deflection element 71 and the deflection element 81 of the optical scanning unit are controlled to change the scanning angle of the light beam according to the operation of the various switches 7a to 7e.

  As described above, the control unit 110 included in the HMD 1 of the present embodiment performs control for adjusting the brightness of the image with reference to the correspondence table, and thus can perform the brightness adjustment without performing complicated arithmetic processing. The processing load on the CPU 101 can be reduced.

  In addition, when the user selects the auto mode by operating the auto mode switch 7a, the control unit 110 executes the brightness adjustment program stored in the ROM 102, and according to the detection result of the brightness sensor 2. The brightness of the image to be displayed is automatically adjusted according to the brightness of the outside world by performing control to change the scanning angle of the light beam to at least one of the horizontal scanning unit 70 and the vertical scanning unit 80 which are optical scanning units. Therefore, the brightness can be easily adjusted without requiring a complicated operation.

(Description of processing performed by control unit of image display device)
Next, processing performed by the control unit 110 in the HMD 1 of the present embodiment will be described with reference to FIGS. 6 and 7.

(Description of main processing)
As shown in FIG. 6, when the power is turned on in the main process, the control unit 110 first performs an initial setting process such as permitting access to a hard disk (not shown) and initializing the work area of the RAM 103 (step S1). S1) After that, a brightness adjustment process for adjusting the brightness of the image to be displayed is executed (step S2), and then the process proceeds to step S3. Note that the brightness adjustment processing performed in step S2 will be specifically described later with reference to FIG.

  Next, in step S3, the control unit 110 determines whether or not an image reproduction operation has been performed. Here, the control unit 110 determines whether or not a reproduction operation has been performed by determining whether or not a signal indicating that a pressing operation has been received from the reproduction switch 6a.

  Then, when the control unit 110 determines that there is no reproduction operation (step S3: NO), the control unit 110 moves the process to step S8, and when it determines that there is a reproduction operation (step S3: Yes), the process proceeds to step S4. Move to.

  In step S4, the control unit 110 performs the same luminance adjustment processing as that performed in step S2, and then proceeds to step S5 to perform image display processing, and then proceeds to step S6.

  In step S6, the control unit 110 determines whether or not there has been a stop operation for stopping the image display. Here, the control unit 110 determines whether or not a stop operation has been performed by determining whether or not a signal indicating that a pressing operation has been received from the stop switch 6b.

  When the control unit 110 determines that there is no stop operation (step S6: No), the process proceeds to step S4. When the control unit 110 determines that there is a stop operation (step S: Yes), the process is performed in step S7. The process proceeds to step S8, and the process of stopping the image display is performed.

  Next, in step S8, the control unit 110 determines whether or not the power is turned off. When it is determined that the power is turned off (step S8: Yes), the main process is terminated and the power is turned off. If it is determined that it has not been performed (step S8: No), the process proceeds to step S3.

(Description of brightness adjustment processing)
Next, the brightness adjustment process performed by the control unit 110 in steps S2 and S4 of the main process will be described with reference to FIG.

  In this luminance adjustment process, the control unit 110 first determines whether or not a luminance adjustment operation has been performed (step S11). Here, the control unit 110 determines whether or not a luminance adjustment operation has been performed by determining whether or not a signal indicating that an operation has been received from any of the switches provided in the luminance adjustment unit 7 has been received. Like to do.

  If the control unit 110 determines that there is a brightness adjustment operation (step S11: Yes), the control unit 110 moves the process to step S12, and if it determines that there is no brightness adjustment operation, ends the brightness adjustment process. Return processing to main processing.

  In step S12, the control unit 110 determines whether or not the auto mode has been selected. If it is determined that the auto mode has been selected (step S12: Yes), the process proceeds to step S13, where the auto mode is selected. If it is determined that it has not been performed (step S12: No), the process proceeds to step S14.

  Here, the control unit 110 determines whether or not the auto mode is selected by determining whether or not a signal indicating that the auto mode is selected by the pressing operation is received from the auto mode switch 7a.

  In step 13, the control unit 110 performs auto mode processing. Here, the control unit 110 executes a brightness adjustment program, selects a desired correspondence table from a plurality of correspondence tables stored in the ROM 102 based on the external brightness information input from the brightness sensor 2, and refers to it. Thus, the brightness of the image to be displayed is adjusted so as to obtain the optimum brightness according to the detection result of the brightness sensor 2, and then the brightness adjustment process is terminated and the process returns to the main process.

  At this time, when the output state change detection unit detects that the output of the light source unit 30 that is the light beam output unit (the light amount of the light beam) has decreased, the control unit 110 sets the scanning angle of the light beam according to the degree of decrease. By performing the control to reduce, automatic adjustment is performed so that the luminance of the image to be displayed becomes the lowest constant luminance value.

  In step S14, the control unit 110 determines whether or not the daytime mode is selected, and when it is determined that the daytime mode is selected (step S14: Yes), the process proceeds to step S15, and the daytime mode is selected. If it is determined that it has not been performed (step S14: No), the process proceeds to step S16.

  Here, the control unit 110 determines whether or not the day mode has been selected by determining whether or not a signal indicating that the slide operation has been performed from the day / night switch 7b to the day mode position is received.

  In step S15, the control unit 110 performs daytime mode processing. Here, the control unit 110 executes the brightness adjustment program, selects and refers to the correspondence table corresponding to the operation of the day / night switch 7b from the plurality of correspondence tables stored in the ROM 102, and selects the daytime in the correspondence table. The brightness of the image to be displayed is adjusted by controlling the light scanning unit to scan the light beam at the mode scanning angle. Thereafter, the brightness adjustment process is terminated and the process returns to the main process.

  In step S16, the control unit 110 determines whether or not the night mode is selected. If it is determined that the night mode is selected (step S16: Yes), the process proceeds to step S17, and the day mode is selected. If it is determined that it has not been performed (step S16: No), the process proceeds to step S18.

  Here, the control unit 110 determines whether or not the night mode is selected by determining whether or not a signal indicating that the slide operation has been performed from the day / night switch 7b to the night mode position is received.

  In step S17, the control unit 110 performs night mode processing. Here, the control unit 110 executes the brightness adjustment program, selects and references the correspondence table corresponding to the operation of the day / night selector switch 7b from the plurality of correspondence tables stored in the ROM 102, and displays the night in the correspondence table. The brightness of the image to be displayed is adjusted by controlling the light scanning unit to scan the light beam at the mode scanning angle. Thereafter, the brightness adjustment process is terminated and the process returns to the main process.

  In step S18, the control unit 110 determines whether or not the clear sky mode is selected. If it is determined that the clear sky mode is selected (step S18: Yes), the process proceeds to step S19, and the clear sky mode is selected. If it is determined that the process has not been performed (step S18: No), the process proceeds to step S20.

  Here, the control unit 110 determines whether or not the clear sky mode is selected by determining whether or not a signal indicating that the slide operation is performed from the clear rain changeover switch 7c to the clear sky mode position is received.

  In step S19, the control unit 110 performs a clear sky mode process. Here, the control unit 110 executes the brightness adjustment program, selects and references a correspondence table corresponding to the operation of the rain / rain switch 7c from a plurality of correspondence tables stored in the ROM 102, and clears the sky in the correspondence table. The brightness of the image to be displayed is adjusted by controlling the light scanning unit to scan the light beam at the mode scanning angle. Thereafter, the brightness adjustment process is terminated and the process returns to the main process.

  In step S20, the control unit 110 determines whether or not the rainy mode has been selected. If it is determined that the rainy mode has been selected (step S20: Yes), the process proceeds to step S21, and the rainy mode is selected. If it is determined that it has not been performed (step S20: No), the process proceeds to step S22.

  Here, the control unit 110 determines whether or not the rainy weather mode is selected by determining whether or not a signal indicating that the slide operation has been performed from the clear rain changeover switch 7c to the rainy weather mode position is received.

  In step S <b> 21, the control unit 110 performs a rainy mode process. Here, the control unit 110 executes the brightness adjustment program, selects and refers to the correspondence table corresponding to the operation of the rain / rain switch 7c from the plurality of correspondence tables stored in the ROM 102, and rains in the correspondence table. The brightness of the image to be displayed is adjusted by controlling the light scanning unit to scan the light beam at the mode scanning angle. Thereafter, the brightness adjustment process is terminated and the process returns to the main process.

  In step S22, the control unit 110 determines whether or not the outdoor mode is selected. If it is determined that the outdoor mode is selected (step S22: Yes), the process proceeds to step S23, and the outdoor mode is selected. If it is determined that it has not been performed (step S22: No), the process proceeds to step S24.

  Here, the control unit 110 determines whether or not the outdoor mode is selected by determining whether or not a signal indicating that the slide operation has been performed from the indoor / outdoor switch 7d to the outdoor mode position is received. .

  In step S23, the control unit 110 performs an outdoor mode process. Here, the control unit 110 executes the brightness adjustment program, selects and references a correspondence table corresponding to the operation of the indoor / outdoor selector switch 7d from a plurality of correspondence tables stored in the ROM 102, and in the correspondence table The brightness of the image to be displayed is adjusted by controlling the light scanning unit to scan the light beam at the scanning angle in the outdoor mode. Thereafter, the brightness adjustment process is terminated and the process returns to the main process.

  In step S24, the control unit 110 determines whether or not the indoor mode has been selected. When it is determined that the indoor mode has been selected (step S24: Yes), the process proceeds to step S25, where the indoor mode is selected. If it is determined that it has not been performed (step S24: No), the process proceeds to step S26.

  Here, the control unit 110 determines whether or not the indoor mode has been selected by determining whether or not a signal indicating that the sliding operation has been performed from the indoor / outdoor switch 7d to the indoor mode position is received. .

  In step S25, the control unit 110 performs indoor mode processing. Here, the control unit 110 executes the brightness adjustment program, selects and references a correspondence table corresponding to the operation of the indoor / outdoor selector switch 7d from a plurality of correspondence tables stored in the ROM 102, and in the correspondence table The brightness of the image to be displayed is adjusted by controlling the light scanning unit to scan the light beam at the scanning angle in the indoor mode. Thereafter, the brightness adjustment process is terminated and the process returns to the main process.

  In step S26, the control unit 110 performs an arbitrary setting process, and then ends the brightness adjustment process and returns the process to the main process.

  In this arbitrary setting process, when the control unit 110 receives a signal indicating that the rotation operation has been performed from the arbitrary changeover switch 7e, the control unit 110 executes a luminance adjustment program, and based on the signal received from the arbitrary changeover switch 7e, The brightness of the image to be displayed is adjusted by controlling the optical scanning unit to scan the light beam at a scanning angle corresponding to the turning operation of the changeover switch 7e.

  At this time, the control unit 110 rotates the arbitrary changeover switch 7e in a direction in which the brightness of the image displayed by the user is increased in a state where the light source unit 30 serving as the light beam output unit outputs the light beam with the maximum output. When this is detected, the brightness of the image to be displayed is further increased by controlling the optical scanning unit to reduce the scanning angle of the light beam.

It is explanatory drawing which shows an example of the brightness | luminance adjustment of the image by the imaging device which concerns on this embodiment. It is an external appearance perspective view which shows the image display apparatus which concerns on this embodiment. It is explanatory drawing which shows the operation input part of the image display apparatus which concerns on this embodiment. It is a functional block diagram which shows the electric constitution of the image display apparatus which concerns on this embodiment. It is explanatory drawing which shows the corresponding | compatible table which matched the brightness | luminance of the image to display, and the scanning angle of a light beam. It is a flowchart which shows the process which the control part of the image display apparatus which concerns on this embodiment performs. It is a flowchart which shows the process which the control part of the image display apparatus which concerns on this embodiment performs.

Explanation of symbols

1 HMD
2 Luminance sensor 6 Operation input unit 7 Luminance adjustment unit 7a Auto mode switch 7b Day / night switching switch 7c Rain / rain switching switch 7d Indoor / outdoor switching switch 7e Arbitrary switching switches V1 to V3 Image 110 Control unit 20 Light flux generation unit 70 Horizontal scanning unit 71 Resonance type Deflection element 72 Horizontal scanning drive circuit 73 Horizontal scanning angle detection circuit 80 Vertical scanning unit 81 Deflection element 82 Vertical scanning control circuit 83 Vertical scanning angle detection circuit

Claims (13)

In an image display device having an optical scanning unit that displays an image by two-dimensionally scanning a light beam generated based on an image signal, and a control unit that controls the operation of the optical scanning unit,
The said control part adjusts the brightness | luminance of the said image to display by performing control which changes the scanning angle of the said light beam to the said optical scanning part, The image display apparatus characterized by the above-mentioned. A light beam output unit for outputting the light beam;
The control unit increases the luminance of the image to be displayed by controlling the optical scanning unit to reduce the scanning angle of the luminous flux in a state where the luminous flux output unit outputs the luminous flux with the maximum output. The image display apparatus according to claim 1. The control unit includes an output state change detection unit that detects a change in the output state of the light flux by the light output unit,
2. The brightness of the image to be displayed is kept constant by controlling the optical scanning unit to change the scanning angle of the light beam according to the detection result of the output state change detection unit. Or the image display apparatus of Claim 2. The optical scanning unit includes a first optical scanning unit that reciprocally scans the light beam in a first direction, and a second optical scanning unit that reciprocates the light beam in a second direction different from the first direction,
The control unit adjusts the luminance of the image to be displayed by controlling the first light scanning unit or the second light scanning unit to change a scanning angle of the light beam. The image display apparatus of any one of -3. The optical scanning unit includes a first optical scanning unit that reciprocally scans the light beam in a first direction, and a second optical scanning unit that reciprocally scans the light beam in a second direction intersecting the first direction,
The control unit adjusts the luminance of the image to be displayed by controlling the first light scanning unit and the second light scanning unit to change a scanning angle of the light beam. The image display apparatus of any one of -3.   The said control part adjusts the brightness | luminance of the said image to display by performing the control which changes the scanning angle of the said light beam by the same rate to the said 1st optical scanning part and the said 2nd optical scanning part, It is characterized by the above-mentioned. Item 6. The image display device according to Item 5. The control unit includes a correspondence table storage unit that stores a correspondence table in which the luminance of the image to be displayed is associated with the scanning angle of the light beam by the optical scanning unit,
The image display apparatus according to claim 1, wherein brightness of the image to be displayed is adjusted using the correspondence table. An operation unit for operating the optical scanning unit to change a scanning angle of the luminous flux;
The image display device according to claim 1, wherein the control unit controls the optical scanning unit to change a scanning angle of the light beam in accordance with an operation of the operation unit. .   The image display apparatus according to claim 8, wherein the operation unit includes a switch capable of changing a scanning angle of the light beam by the optical scanning unit in a plurality of stages for each external situation. It has a brightness sensor that detects the brightness of the outside world,
10. The image according to claim 1, wherein the control unit controls the optical scanning unit to change a scanning angle of the light beam according to a detection result of the luminance sensor. 11. Display device.   The image display device according to claim 1, wherein the light scanning unit scans the light beam in a two-dimensional direction, guides the scanned light to an eye, and forms the image on the retina. It is a retinal scanning image display device.   The image display device according to claim 1, wherein the light scanning unit scans the light beam in a two-dimensional direction and projects the light onto a screen, thereby displaying the image on the screen. It is a type image display device. Luminance adjustment method for the image by an image display device having an optical scanning unit that displays an image by two-dimensionally scanning a light beam generated based on an image signal, and a control unit that controls the operation of the optical scanning unit In
A luminance adjustment method, wherein the luminance of the image to be displayed is adjusted by changing a scanning angle of the light beam by the optical scanning unit.

Images