JP2011133548A - Visual field-specifying device and display position-adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a visual field-specifying device that can appropriately specify visual field according a user, and to provide a display position-adjusting device that displays an image in an appropriate display position according to a user. <P>SOLUTION: While the brain wave of a driver D is detected by an EEG sensor 4, an HUD control section 2 moves a blinking image V. When the driver D looks at the blinking image V blinking at a constant frequency, the brain wave of the driver D shows the peak of frequency synchronized with the blink frequency. When the blinking image V ceases to be seen, the peak of the frequency synchronized with the blink frequency disappears. Accordingly, the HUD control section 2 determines that the display position of the blinking image V at the point of time that the peak of the brain wave appears, or the display position of the blinking image V at the point of time that the peak disappears, is a critical position for the visual field F of a user. By specifying the visual field F based on a driver's own reaction, the visual field F is appropriately specified according to the driver D. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a visual field specifying device that specifies a visual field of a user and a display position adjusting device that adjusts a display position of an image based on the specified visual field.

  As a conventional visual field specifying device and display position adjusting device, the line-of-sight position is detected from the user's eyeball position and eyeball center coordinates, the image formation position of the display image is calculated based on the detection result, and the visible light is based on the calculation result There is known one that adjusts the emission direction (see, for example, Patent Document 1). In the conventional apparatus, the position of the eyeball is detected a plurality of times, and the display position of the image is adjusted by adjusting the optical path based on the distance or angle difference between the eyeball position and the reference eyeball position at each time.

JP 2008-155720 A

  However, in the above-described apparatus, the line-of-sight position and the visual field are estimated from the eyeball position and the eyeball center coordinates. Here, since the physique, posture, and field of view are different for each user, the optimum display position varies depending on the user. However, in the method of adjusting the display position of the image of the head-up display using the apparatus as described above, since the visual field for each user is not detected, there is a problem that it is not possible to deal with individual differences in the visual field. is there. Therefore, it is required to appropriately specify the field of view according to the user.

  The present invention has been made to solve such a problem, and a field-of-view identifying apparatus that can appropriately identify a field of view according to a user, and an image at an appropriate display position according to the user. An object of the present invention is to provide a display position adjusting device capable of displaying.

  The visual field specifying device according to the present invention includes an electroencephalogram detecting means for detecting a user's brain wave, a movement control means for moving the blinking portion at a position on the user's line of sight, and a visual field specifying means for specifying the user's visual field. The visual field specifying means specifies the visual field of the user based on the detection value detected by the electroencephalogram detection means when the user visually recognizes the flashing part and the position of the flashing part. To do.

  In the visual field identification device according to the present invention, the electroencephalogram detection means detects the electroencephalogram of the user, while the movement control means can move the blinking part. When the user sees the blinking part blinking at a certain frequency, a peak of the frequency synchronized with the blinking frequency appears in the user's brain wave. Also, when the blinking part that was being viewed becomes invisible, the frequency peak synchronized with the blinking frequency disappears. Accordingly, the visual field specifying means can determine that the flashing portion exists within the range of the visual field of the user when a peak synchronized with the flashing frequency appears during the movement of the flashing portion. Further, the visual field specifying means determines that the display position of the blinking portion when the electroencephalogram peak appears or the display position of the blinking portion when the electroencephalogram peak disappears is the critical position of the user's visual field. Can do. In this way, it is possible to identify the field of view based on the user's own reaction, so the field of view should be appropriately identified according to the user regardless of the posture, physique and field of view of each user. Can do.

  The visual field identification device according to the present invention further includes display means for displaying an image, the movement control means moves the blinking portion on the display means, and the visual field identification means displays the user's visual field on the display means. It is preferable to specify. The movement control means moves the blinking part on the display means itself for displaying an image, and the visual field specifying means specifies the visual field based on the user's brain wave by looking at the blinking part moving on the display means. Can do. Therefore, the visual field for the display means can be specified more appropriately.

  A display position adjusting device according to the present invention includes the above-described visual field specifying device and a display position adjusting unit that adjusts a display position of an image on the display unit, and the display position adjusting unit is specified by the visual field specifying unit. The display position of the image is adjusted based on the user's visual field.

  In the display position adjusting device according to the present invention, the display position adjusting means can adjust the display position of the image based on the field of view accurately specified by the field of view specifying device. Therefore, an image can be displayed at an appropriate display position in accordance with the user regardless of the posture, physique, and field of view of each user.

  According to the present invention, the field of view can be specified appropriately according to the user, and an image can be displayed at an appropriate display position according to the user.

It is the figure which showed the structure of the display apparatus which functions as a visual field identification apparatus and display position adjustment apparatus which concern on embodiment of this invention. It is a flowchart which shows the content of the visual field identification process and display position adjustment process which concern on embodiment of this invention. It is a flowchart which shows the content of the visual field identification process and display position adjustment process which concern on embodiment of this invention. It is a graph which shows the relationship between the time after the blinking image starts moving from the image movable lower limit position and the display position of the blinking image. It is a graph which shows the frequency spectrum of the electroencephalogram obtained from an EEG sensor. It is a graph which shows the relationship between the time after the blinking image starts moving from the image movable lower limit position, the display position of the blinking image, and the blinking frequency of the blinking image. It is a graph which shows the frequency spectrum of the electroencephalogram obtained from an EEG sensor.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a visual field specifying device and a display position adjusting device according to the invention will be described in detail with reference to the drawings.

  First, the configuration of the display device 1 that functions as a visual field identification device and a display position adjustment device according to an embodiment of the present invention will be described. FIG. 1 is a diagram showing a configuration of a display device 1 that functions as a visual field specifying device and a display position adjusting device according to an embodiment of the present invention. The display device 1 functions as a visual field specifying device that specifies the driver's visual field when the head-up display (hereinafter referred to as HUD) 3 in the vehicle is started, and adjusts the display position of the image based on the specified visual field. It functions as a position adjustment device. That is, the display device 1 moves the blinking image (flashing portion) V blinking at a predetermined frequency from the image movable lower limit position VD to the image movable upper limit position VU at the time of starting up the system (the movement path is shown in FIG. 1). L), and has a function of specifying the visual field F of the driver D based on the detection result of the brain wave of the driver D during the movement. Furthermore, the display device 1 has a function of calculating an optimum display position for the driver D based on the identified visual field F and adjusting the elephant to the optimum position. The display device 1 includes a HUD control unit 2, a HUD 3, an EEG (Electroencephalography) sensor 4, and a manual adjustment switch 5. In the present invention, the “field of view” refers to a visible range when the eyes of the driver D are fixed in a predetermined direction, and a range in which a peak synchronized with the flashing frequency appears in the brain wave when the flashing image V is viewed. Show.

  The HUD 3 displays a predetermined image V in the field of view of the driver D of the vehicle. The HUD 3 according to the present embodiment displays an image using the windshield as a display unit (display unit) 21. The HUD 3 is provided in the dashboard 22 and includes an image display tube 23 that generates an image V displayed on the display unit 21 and a mirror 24 that projects the image V from the image display tube 23 onto the display unit. ing. In the HUD 3, an image V is projected from the image display tube 23 toward the mirror 24, and the image V is reflected toward the display unit 21 by the mirror 24. Further, the image V is reflected on the display unit 21 in the direction of the eyeball of the driver D, whereby the image V is displayed as a virtual image at a predetermined display position. In FIG. 1, the field of view of the driver D is indicated by F. The field lower limit position indicating the lower limit of the field F is indicated by ED. In addition, the visual field upper limit position indicating the upper limit of the visual field F is indicated by EU. The visual field F, the visual field lower limit position ED, and the visual field upper limit position EU have individual differences depending on the driver D depending on the size, physique, and posture of the pupil. A driving device (display position adjusting means) 28 is connected to the mirror 24 so that the angle can be adjusted. The drive device 28 can adjust the display position of the image V on the display unit 21 by adjusting the angle of the mirror 24. In the present embodiment, the drive device 28 can adjust the image V to be displayed at an optimum position with respect to the visual field F of the driver D according to the control signal of the HUD control unit 2.

  In the HUD 3, the image V projected from the image display tube 23 is displayed through a display frame 26 provided in the vicinity of the image display tube 23 and an opening 27 of the dashboard 22. Therefore, the range in which the image V can be displayed on the display unit 21 is limited by the display frame 26 and the opening 27. Further, the movable range of the mirror 24 is also limited. Therefore, the range in which the image V can be moved by adjusting the display position on the display unit 21 is limited to a predetermined range. In FIG. 1, an image movable lower limit position representing a lower limit at which the image V can be moved is indicated by VD, and an image movable upper limit position representing an upper limit at which the image V can be moved is indicated by VU.

  The EEG sensor (electroencephalogram detection means) 4 is provided in the headrest and has a function of measuring the electroencephalogram of the driver D. Here, when the driver sees the blinking image V blinking at a constant frequency, the visual signal SG is transmitted to the primary visual cortex of the occipital lobe BR. Regardless of the intention of the driver D, a frequency component synchronized with the blinking frequency of the blinking image V appears in the electroencephalogram in this portion. Therefore, the EEG sensor 4 does not detect the frequency peak when the blinking image V is not in the field of view F of the driver D (see G1 in FIG. 5), and the blinking image V is in the field of view F of the driver D. When it is on, the peak of the frequency synchronized with the blinking frequency is detected (see G2 in FIG. 5). The EEG sensor 4 has a function of outputting the detection result to the HUD control unit 2.

  The manual adjustment switch 5 is a switch provided in the vehicle, and is for adjusting the angle of the mirror 24 by the operation of the driver D and adjusting the display position of the image V on the display unit 21. The manual adjustment switch 5 has a function of outputting an operation signal to the HUD control unit 2 when receiving an operation from the driver D.

  The HUD control unit 2 is an electronic control unit that controls the entire display device 1. The HUD control unit 2 is mainly composed of a CPU, for example, and includes a ROM, a RAM, an input signal circuit, an output signal circuit, a power supply circuit, and the like. The HUD 2 functions as a movement control means for moving the image V, a visual field specifying means for specifying the visual field of the driver D, and a display position adjusting means for adjusting the display position of the image V. The HUD 2 includes a display control unit 6, a mirror drive control unit 7, an electroencephalogram determination unit 8, and a calculation unit 9.

  The display control unit 6 has a function of outputting a control signal related to an image to be generated to the image display tube 23 based on the calculation result from the calculation unit 9. In the present embodiment, the display control unit 6 has a function of setting a drawing pattern of a blinking image V that sweeps from the image movable lower limit position VD to the image movable upper limit position VU while blinking in order to specify the visual field F. . The drawing pattern of the flashing image V (the pattern of the flashing image V) is not particularly limited as long as it has sufficient visual strength depending on the light emitting area and the luminance. For example, the entire image display tube 23 may emit light, a vehicle logo mark, or a vehicle speed display (“0 km / h” is displayed when the vehicle is stopped). The blinking frequency of the blinking image V is set to around 10 Hz, which is considered suitable for visual evoked brain wave detection. The mirror drive control unit 7 has a function of outputting a control signal to the drive device 28 based on the calculation result from the calculation unit 9.

  The electroencephalogram determination unit 8 has a function of determining whether a signal indicating synchronization with the flashing frequency of the flashing image V is detected from the brain wave of the driver D based on the detection result from the EEG sensor 4. ing. The signal detection can be performed by fast Fourier transforming the input from the EEG sensor 4. The electroencephalogram determination unit 8 determines that a signal is detected when a peak synchronized with the flashing frequency of the flashing image V appears when the flashing image V enters the visual field F of the driver D, and the flashing image V is detected by the driver. By exiting from the field of view F of D, it can be determined that no signal is detected when the peak synchronized with the blinking frequency of the blinking image V disappears. The electroencephalogram determination unit 8 has a function of outputting the determination result to the calculation unit 9.

  The calculation unit 9 has a function of generating the image V by calculating the content of the image V to be displayed and outputting a control signal to the display control unit 6. The calculation part 9 can also set the frequency, when blinking the image V. FIG. In addition, the calculation unit 9 has a function of calculating a display position where the image V should be displayed on the display unit 21 and adjusting the display position by outputting a control signal to the mirror drive control unit 7. . Further, the calculation unit 9 has a function of controlling the movement of the image V for specifying the visual field. In the present embodiment, the calculation unit 9 performs the visual field specifying process by causing reciprocal movement between the image movable lower limit position VD and the image movable upper limit position VU. The calculation unit 9 has a function of specifying the visual field F of the driver D based on the determination result of the electroencephalogram determination unit 8 for the image V. That is, the calculation unit 9 can detect the display position of the blinking image V at the time when the brain wave determination unit 8 determines that a peak appears in the brain wave as the visual field lower limit position ED of the visual field F. The display position of the blinking image V when it is determined that the peak has disappeared from the electroencephalogram can be detected as the visual field upper limit position EU of the visual field F. Thereby, the range of the visual field F of the driver D can be specified. In addition, the calculation unit 9 has a function of calculating the optimum position where the image V is to be displayed based on the identified visual field F. Specifically, the optimum display position can be set at the center position BP between the visual field upper limit position EU and the visual field lower limit position ED. Alternatively, the optimum display position may be set at a position offset up and down from the center position BP in consideration of the tendency of change over time and design requirements.

  Next, the operation of the display device 1 according to the present embodiment will be described with reference to FIGS. 2 and 3 are flowcharts showing the contents of the visual field specifying process and the display position adjusting process according to the embodiment of the present invention. This processing is executed at a predetermined timing in the HUD control unit 2 when the display system is activated or when an instruction for readjustment of the image display position is input. The movement of the blinking image V, the adjustment of the display position, and the end of blinking are processes that are executed by the calculation unit 9 outputting signals to the display control unit 6 and the mirror drive control unit 7 at a predetermined timing.

  First, as shown in FIG. 2, the calculation unit 9 displays a blinking image V blinking at 10 Hz on the display unit 21 (step S10), and moves the blinking image V to the image movable lower limit position VD. Is initialized (step S12). Next, the calculating part 9 starts the upward movement of the blinking image V from the image movable lower limit position VD (step S14).

  While the blinking image V is moved upward, the electroencephalogram determination unit 8 performs a determination process of the brain wave of the driver D (step S16), and the calculation unit 9 performs visual field based on the determination result of the electroencephalogram determination unit 8. The visual field lower limit position ED and the visual field upper limit position EU in F are detected (step S18). The processing contents will be described with reference to FIG. 4 and FIG. FIG. 4 is a graph showing the relationship between the time after the blinking image V starts moving from the image movable lower limit position VD and the display position of the blinking image V. FIG. 5 is a graph showing a frequency spectrum of an electroencephalogram obtained from the EEG sensor 4. As shown in FIG. 4, the area between the image movable lower limit position VD and the field lower limit position ED and the field upper limit position EU until the blinking image V moves from the image movable lower limit position VD to the image movable upper limit position VU. To the image movable upper limit position VU (indicated by a one-dot difference line G1 in the figure) is an area where the blinking image V exists outside the field of view F, and from the field of view lower limit position ED to the field of view. A region between the upper limit position EU (indicated by a solid line G2 in the figure) is a region where the blink image V exists in the field of view F. In FIG. 5, the frequency spectrum in the region G1 in FIG. 4 is indicated by a one-dotted line, and the frequency spectrum in the region G2 is indicated by a solid line. As shown in FIG. 5, in the region G <b> 1 where a specific frequency peak does not appear in the brain wave of the driver D, the blinking image V is not visually recognized, and the blinking image V exists outside the visual field F. I understand that. On the other hand, in the region G2 where the brain wave has a peak around 10 Hz which is the blinking frequency of the blink image V, the blink image V is visually recognized, and it can be seen that the blink image V exists in the visual field F. Accordingly, the calculation unit 9 can detect the display position of the blinking image V as the visual field lower limit position ED at the time when the electroencephalogram determination unit 8 determines that a peak has occurred in the electroencephalogram. In addition, the calculation unit 9 can detect the display position of the blinking image V at the time when the brain wave determination unit 8 determines that the peak has disappeared from the brain wave as the visual field upper limit position EU.

  Returning to FIG. 2, when the blinking image V reaches the image movable upper limit position VU, the calculation unit 9 reverses the moving direction and lowers the blinking image V (step S20). At this time, as shown in FIG. 4 and FIG. 5, in the region G1 where the blink image V starts to fall, since it is outside the visual field F, no peak appears in the electroencephalogram. Since it is inside the visual field F, a peak appears in the electroencephalogram. Accordingly, the calculation unit 9 redetects the display position of the blinking image V at the time point when the electroencephalogram determination unit 8 determines that a peak has occurred in the electroencephalogram as the visual field upper limit position EU ′ (step S22).

  Next, the calculation unit 9 determines whether or not the error between the visual field upper limit position EU detected in S18 and the visual field upper limit position EU ′ redetected in S22 is within an allowable range (step S24). . Specifically, the calculation unit 9 determines whether or not the difference between the visual field upper limit position EU detected in S18 and the visual field upper limit position EU ′ redetected in S22 is smaller than a predetermined allowable error constant t ( | EU-EU ′ | <t). In the example shown in FIG. 4, since the difference between EU and EU ′ is smaller than t, it is determined that the error is within the allowable range. If it is determined in S24 that the error is not within the allowable range, the process proceeds to the control process B shown in FIG. Thus, even after the blinking image V reaches the image movable upper limit position VU, it is possible to confirm the deviation of the detection result by reversing and detecting the visual field upper limit position EU again. A detailed description of the control process B will be described later.

  If it is determined in S24 that the error is within the allowable range, the calculation unit 9 calculates an optimum display position for displaying the image V on the display unit 21. In the present embodiment, the calculation unit 9 sets the midpoint (ED + EU) / 2 between the visual field lower limit position ED and the visual field upper limit position EU detected in S18 as the optimal display position (step S26). Further, the blinking image V is moved to the optimum display position set in S26 (step S28). The calculation unit 9 stops the blinking of the blinking image V that has moved to the optimum display position to obtain a steady-lighted image V (step S30). When the process of S30 ends, the visual field specifying process and the display position adjusting process by the display device 1 are successful, and the processes shown in FIGS. 2 and 3 are ended (normal end).

  On the other hand, when it is determined in S24 that the error is not within the allowable range, the process proceeds to the control process B shown in FIG. In the control process B, first, the calculation unit 9 continues the descent of the blinking image V (step S40). The electroencephalogram determination unit 8 determines the electroencephalogram in the same manner as the process of S16 (step S42), and the calculation unit 9 determines the display position of the blinking image V when the electroencephalogram determination unit 8 determines that the peak has disappeared from the electroencephalogram. Re-detection is made as the visual field lower limit position ED '(step S44). Thereafter, the calculation unit 9 causes the blinking image V to reach the image movable lower limit position VD (step S46), and determines whether or not the number of movements of the blinking image V for identifying the field of view is within a specified number of repetitions (step S48). ). The specified number of repetitions indicates the upper limit of the number of reciprocations of the blinking image V, and can be arbitrarily set to a number in a range where the driver D does not feel bothered by prolonged visual field identification processing.

  If it is determined in S48 that the number of reciprocations is within the prescribed number of repetitions, the arithmetic unit 9 inverts the blinking image V and starts the ascending movement (step S52). The electroencephalogram determination unit 8 determines an electroencephalogram in the same manner as the process of S16 (step S54), and the calculation unit 9 determines the display position of the blinking image V at the time when the electroencephalogram determination unit 8 determines that a peak appears in the electroencephalogram. It is detected as the visual field lower limit position ED (step S56). Next, the calculation unit 9 determines whether or not the error between the visual field lower limit position ED ′ detected in S44 and the visual field lower limit position ED detected in S56 is within an allowable range (step S58). Specifically, the calculation unit 9 determines whether or not the difference between the visual field lower limit position ED ′ detected in S44 and the visual field lower limit position ED redetected in S56 is smaller than a predetermined allowable error constant t ( | ED′−ED | <t).

  If it is determined in S58 that the error is not within the allowable range, the arithmetic unit 9 continues the upward movement of the blinking image V (step S60). In addition, the electroencephalogram determination unit 8 determines the electroencephalogram in the same manner as the process of S16 (step S62), and the calculation unit 9 displays the flashing image V when the electroencephalogram determination unit 8 determines that the peak has disappeared from the electroencephalogram. The position is detected as the visual field upper limit position EU (step S64). Thereafter, the processes after the control process A shown in FIG. 2 are repeated again.

  On the other hand, when it is determined in S58 that the error is within the allowable range, the calculation unit 9 calculates an optimum display position for displaying the image V on the display unit 21. In the present embodiment, the calculation unit 9 sets the midpoint (ED ′ + EU ′) / 2 between the visual field upper limit position EU ′ detected in S22 and the visual field lower limit position ED ′ detected in S44 as the optimum display position. (Step S66). Further, the blinking image V is moved to the optimum display position set in S66 (step S68). The calculation unit 9 stops the blinking of the blinking image V that has moved to the optimum display position to obtain a steady lighting image V (step S70). When the process of S70 is completed, the visual field specifying process and the display position adjusting process by the display device 1 are successful, and the processes shown in FIGS. 2 and 3 are terminated (normal termination by retry). As described above, when there is a detection error, the visual field can be accurately identified by repeatedly performing the detection.

  If it is determined in S48 that the specified number of repetitions has been exceeded by repeating the processes shown in FIGS. 2 and 3 a plurality of times, the calculation unit 9 arbitrarily sets the optimum position and displays the flashing image V at the display position. It is moved to stop blinking to obtain a steady lighting image V (step S50). Arbitrary optimum positions can be calculated as the optimum position based on the visual field lower limit position and the visual field upper limit position obtained by multiple detections, and this average value can be set as the optimum position. When the process of S50 is completed, the visual field identification process and the display position adjustment process are determined to have failed, and the processes shown in FIGS. 2 and 3 are terminated (failure termination). Thus, by setting the prescribed number of repetitions, it is possible to prevent the driver from feeling annoyance due to the processing taking too long.

  As described above, in the display device 1 as the visual field identification device according to the present embodiment, the HEG control unit 2 can move the blinking image V while the EEG sensor 4 detects the brain wave of the driver D. When the driver D sees the blinking image V blinking at a constant frequency, a peak of the frequency synchronized with the blinking frequency appears in the brain wave of the driver D. Further, when the blinking image V that has been viewed becomes invisible, the frequency peak synchronized with the blinking frequency disappears. Therefore, the HUD control unit 2 can determine that the blinking image V exists within the range of the visual field F of the driver D when the peak synchronized with the blinking frequency appears while the blinking image V is moving. Further, the HUD control unit 2 determines the display position of the flashing image V when the brain wave peak appears or the display position of the flashing image V when the brain wave peak disappears, as the upper limit position and the lower limit of the user's visual field F. It can be determined that it is a critical position such as a position. In this way, since the field of view F can be specified based on the driver's own reaction, the field of view F can be appropriately determined according to the driver D regardless of the posture, physique, and field of view of each driver D. Can be specified.

  Further, the display device 1 as the visual field specifying device according to the present embodiment further includes a display unit 21 that displays the image V, and the HUD control unit 2 moves the blinking image V on the display unit 21 to display the display unit 21. The driver's D visual field can be identified. The HUD control unit 2 moves the blinking image V on the display unit 21 displaying the image V, and changes the field of view F based on the brain wave of the driver D by viewing the blinking image V moving on the display unit 21. Can be identified. Therefore, the visual field F for the display unit 21 can be specified more appropriately.

  In the display device 1 as the display position adjusting device according to the present invention, the HUD control unit 2 and the driving device 28 can adjust the display position of the image V based on the field of view F accurately specified by the field of view specifying process. . Therefore, an image can be displayed at an appropriate display position according to the driver D regardless of the posture, physique, eye size, or the like of each driver D.

  The visual field specifying device and the display position adjusting device according to the present invention are not limited to the above-described embodiments.

  For example, in the above-described embodiment, the blinking frequency of the blinking image V is swept up and down, but the blinking image V may be swept up and down while continuously changing the blinking frequency of the blinking image V. For example, the blinking frequency at the image movable lower limit position VD is set to 6 Hz, the blinking frequency at the image movable upper limit position VU is set to 18 Hz, and the blinking frequency changes as the image moves from the image movable lower limit position VD to the image movable upper limit position VU. Can be made. FIG. 6 is a graph showing the relationship between the time after the blinking image V starts moving from the image movable lower limit position VD, the display position of the blinking image V, and the blinking frequency of the blinking image V. FIG. 7 is a graph showing a frequency spectrum of an electroencephalogram obtained from the EEG sensor 4. As shown in FIG. 6, when the frequency at the display position GD2 at the visual field lower limit position ED is α (Hz) and the frequency at the display position GU2 at the visual field upper limit position EU is β (Hz), as shown in FIG. In the brain wave frequency spectrum at the display position GD2, a peak appears at the frequency α (Hz), and in the brain wave frequency spectrum at the display position GU2, a peak appears at the frequency β (Hz). As the blink image V moves from the display position GD2 to the display position GU2, the peak in the frequency spectrum also moves from the frequency α to the frequency β. Therefore, the calculation unit 9 detects the display position when the peak appears in the electroencephalogram as the visual field lower limit position ED, and detects the display position when the peak whose frequency continuously changes disappears as the visual field upper limit position EU. Can do. Thereby, the calculating part 9 can specify the visual field F and set an optimal display position. Other processes can be the same as those in the above-described embodiment. After the blinking image V reaches the image movable upper limit position VU, it may be moved while gradually changing the blinking frequency from a frequency of 18 Hz to 6 Hz for confirmation of the shift, or switching to steady light emission toward the optimum position. It may be moved.

  In the above-described embodiment, an example in which the appearance and disappearance of an electroencephalogram is detected between the image movable upper limit position VU and the image movable lower limit position VD has been described. When the peak of the electroencephalogram has already been detected, the image movable lower limit / upper limit position can be set to the visual field lower limit / upper limit position, respectively. Further, when the peak of the electroencephalogram cannot be detected in the entire region, the upper and lower sweeps of the blinking image V are repeated repeatedly. However, even when the position of the image V is fixed to the image movable lower limit position VD when the specified number of times is exceeded. Good. Further, when the driver D feels it is difficult to see the image V, manual setting may be performed by the manual adjustment switch 5.

  Further, in the above-described embodiment, the blinking image V blinks even when the blinking image V moves upward, reverses and descends, but it may be steady light when descending. However, in order to confirm the shift, it is possible to specify the visual field more accurately by blinking when descending.

  Further, the application target of the present invention is not limited to HUD in a vehicle, and can be applied to an object in which the position of an image to be displayed needs to be adjusted according to the user's visual field.

  DESCRIPTION OF SYMBOLS 1 ... Display apparatus (visual field identification apparatus, display position adjustment apparatus), 2 ... HUD control part (movement control means, visual field identification means, display position adjustment means), 4 ... EEG sensor (electroencephalogram detection means), 21 ... Display part ( Display means), 28... Driving device (display position adjusting means), V... Flashing image (flashing portion), F.

Claims (3)

An electroencephalogram detection means for detecting the electroencephalogram of the user;
Movement control means for moving the blinking part at a position on the line of sight of the user;
Visual field specifying means for specifying the user's visual field,
The visual field specifying means specifies the visual field of the user based on a detection value detected by the electroencephalogram detection means when the user visually recognizes the flashing part and a position of the flashing part. A visual field specifying device characterized. A display means for displaying an image;
The movement control means moves the blinking part on the display means,
2. The visual field specifying device according to claim 1, wherein the visual field specifying means specifies the visual field of the user on the display means. The visual field specifying device according to claim 2,
Display position adjusting means for adjusting the display position of the image on the display means,
The display position adjusting device adjusts a display position of an image based on the visual field of the user specified by the visual field specifying device.

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