Vehicle display device

Abstract

To provide a display device for vehicles capable of properly changing three-dimensional display and two-dimensional display.SOLUTION: A display device 1 for vehicles includes a display unit 10 designed to perform two-dimensional display and three-dimensional display, an acquisition unit 12 that acquires the orientation of a sight line of a driver 200, and a control unit 11 that controls the display unit 10. When determining that the driver's sight line is oriented to a display 10a, the control unit 11 performs first change control of changing two-dimensional display into three-dimensional display by augmenting a parallax between a left-eye image IML and a right-eye image IMR into a predetermined value. When determining that the driver's sight line is not oriented to the display, the control unit performs second change control of changing three-dimensional display into two-dimensional display by diminishing the parallax between the left-eye image and right-eye image from the predetermined value. A speed of a variation in the parallax under the second change control is slower than a speed of a variation in the parallax under the first change control.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a display device for a vehicle. [Background technology]

[0002] Conventionally, there is a technology related to three-dimensional display that displays images stereoscopically in a vehicle display device. Patent Document 1 discloses a multiple display device that includes a stereoscopic display device that displays three-dimensional images based on the principle of binocular parallax and a two-dimensional display device that displays two-dimensional images on a two-dimensional display surface, and the position of the two-dimensional display surface is set within a predetermined range relative to the position of the screen of the stereoscopic display device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-81483 Summary of the Invention [Problem to be solved by the invention]

[0004] In a vehicle display device that displays a three-dimensional image, it is sometimes necessary to switch between the three-dimensional image and the two-dimensional image. In this case, the change on the display when switching between the three-dimensional image and the two-dimensional image may attract the attention of a driver who is not looking at the display, or may cause annoyance to the driver. Therefore, it is desirable to be able to switch between the three-dimensional image and the two-dimensional image appropriately.

[0005] An object of the present invention is to provide a vehicle display device that can appropriately switch between three-dimensional display and two-dimensional display. [Means for solving the problem]

[0006] The vehicular display device of the present invention is mounted on a vehicle and includes a display device configured to perform two-dimensional display for displaying a display image in a planar manner on a display, and three-dimensional display for displaying a left-eye image directed to the left eye of a driver of the vehicle and a right-eye image directed to the right eye of the driver on the display, and displaying the display image three-dimensionally by parallax between the left-eye image and the right-eye image; an acquisition unit that acquires a line-of-sight direction of the driver; and a control unit that determines whether the line-of-sight of the driver is directed toward the display from the line-of-sight direction of the driver acquired by the acquisition unit and controls the display device, and the control unit determines whether the line-of-sight of the driver is directed toward the display when the two-dimensional display is being performed. When the control unit determines that the driver's line of sight is not directed toward the display while the 3D display is being performed, the control unit performs a first switching control to switch the 2D display to the 3D display by increasing the disparity between the image for the left eye and the image for the right eye to a predetermined value, and when the control unit determines that the driver's line of sight is not directed toward the display while the 3D display is being performed, the control unit performs a second switching control to switch the 3D display to the 2D display by decreasing the disparity between the image for the left eye and the image for the right eye from the predetermined value, and the speed of change of the disparity when decreasing the disparity in the second switching control is slower than the speed of change of the disparity when increasing the disparity in the first switching control. [Effects of the Invention]

[0007] The vehicle display device according to the present invention has the advantage of being able to appropriately switch between three-dimensional display and two-dimensional display. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a layout diagram of a vehicle display device according to an embodiment. [Figure 2] FIG. 2 is a layout diagram of the vehicle display device according to the embodiment. [Figure 3] FIG. 3 is a schematic configuration diagram of the vehicle display device according to the embodiment. [Figure 4]FIG. 4 is a schematic diagram showing the first switching control of the vehicle display device according to the embodiment. [Figure 5] FIG. 5 is a schematic diagram showing the second switching control of the vehicle display device according to the embodiment. [Figure 6] FIG. 6 is a graph showing the relationship between the display movement speed and the frame rate of the display device in the first switching control and the second switching control of the vehicle display device according to the embodiment. [Figure 7] FIG. 7 is a schematic diagram of a display device for a vehicle according to an embodiment. [Figure 8] FIG. 8 is a schematic diagram showing a manner in which the vehicular display device according to the embodiment switches from a three-dimensional display to a two-dimensional display. [Figure 9] FIG. 9 is a flowchart illustrating an example of the operation of the vehicle display device according to the embodiment. [Figure 10] FIG. 10 is a schematic diagram showing a first switching control of a vehicle display device according to a modified example of the embodiment. [Figure 11] FIG. 11 is a schematic diagram showing a second switching control of a vehicle display device according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a vehicle display device according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiment. Furthermore, the components in the following embodiments include those that can be easily imagined by a person skilled in the art or those that are substantially the same.

[0010] [Embodiment] An embodiment will be described with reference to FIGS. 1 to 9. The embodiment relates to a vehicle display device. FIG. 1 is a layout diagram of a vehicle display device according to an embodiment. FIG. 2 is a layout diagram of a vehicle display device according to an embodiment. FIG. 3 is a schematic configuration diagram of a vehicle display device according to an embodiment. FIG. 4 is a schematic diagram showing first switching control of the vehicle display device according to an embodiment. FIG. 5 is a schematic diagram showing second switching control of the vehicle display device according to an embodiment. FIG. 6 is a graph diagram showing the relationship between the display movement speed and the frame rate of the display device in the first switching control and the second switching control of the vehicle display device according to an embodiment. FIG. 7 is a schematic diagram of the vehicle display device according to an embodiment. FIG. 8 is a schematic diagram showing switching from 3D display to 2D display of the vehicle display device according to an embodiment. FIG. 9 is a flowchart diagram showing an example of the operation of the vehicle display device according to an embodiment.

[0011] 1, the vehicle display device 1 of the embodiment is a display device mounted on a vehicle 100 such as an automobile. The vehicle display device 1 of the embodiment is a 3D meter capable of three-dimensionally displaying a display image IM in a stereoscopic manner, and can display the display image IM by switching between three-dimensional display and two-dimensional display that displays the display image IM in a planar manner.

[0012] The vehicular display device 1 is mounted on an instrument panel 101 of the vehicle 100 and disposed in front of a driver 200 of the vehicle 100. In the embodiment, the vehicular display device 1 includes a display device 10 and a control unit 11 that controls the display device 10 (see FIGS. 1 to 3). The vehicular display device 1 also includes a face detection camera (acquisition unit) 12 that captures an image of the driver 200 to detect the face of the driver 200 and acquires the position of the driver's 200's eyes and the direction of the driver's line of sight.

[0013] 2, the display device 10 of this embodiment is formed in the shape of a rectangular plate with its longitudinal direction aligned with the vehicle width direction, and has a display 10a that displays a display image IM on the surface facing the driver 200. The face detection camera 12 is disposed in the center of the upper part of the surface facing the driver 200.

[0014] As shown in FIG. 3, the control unit 11 includes a SoC (System-on-a-Chip) 11a and a ROM 11b storing information about the display image IM. The control unit 11 is provided inside the display device 10, for example. The SoC 11a includes a determination unit that determines whether the driver 200 is oriented toward the display device 10 based on the direction of the driver's gaze acquired from the face detection camera 12. The SoC 11a also acquires vehicle data 13 related to the vehicle 100, such as the speed of the vehicle 100 and the engine speed of the vehicle 100, from an ECU (Electronic Control Unit) of the vehicle 100 or the like. The SoC 11a reads information about the display image IM to be displayed on the display device 10 from the ROM 11b based on the vehicle data 13 and the determination result of the determination unit regarding the direction of the driver's gaze, and outputs the information to the display device 10. Through this control, the control unit 11 causes the display device 10 to display the display image IM.

[0015] In the embodiment, the SoC 11a displays a meter image on the display 10. The meter image is an image showing the driving state of the vehicle 100. The meter image is typically an image including a display showing the driving speed of the vehicle 100 and a display showing the rotation speed of the engine. The meter image may also include an image showing the driving load of the vehicle 100. In the embodiment, the display 10 displays, as the display image IM, a display (speedometer) showing the driving speed on the left side as viewed by the driver 200, and a display (tachometer) showing the engine rotation speed on the right side.

[0016] The control unit 11 switches between two-dimensional display and three-dimensional display in accordance with movement of the line of sight of the driver 200, and displays the display image IM on the display device 10. For example, when the control unit 11 determines that the line of sight of the driver 200 is directed toward the display device 10 while the display device 10 is performing two-dimensional display, the control unit 11 performs first switching control to switch the two-dimensional display to three-dimensional display. In the first switching control, as shown by arrow Y1 in FIG. 4, the display device 10 switches the two-dimensional display image IMa, which is a planar display image IM on the display 10a, to a three-dimensional display image IMb, which is a stereoscopic display image IM, and performs a three-dimensional display (pop-out display) in which the three-dimensional display image IMb pops out from the display 10a toward the driver 200 and stops at a predetermined position between the display 10a and the driver 200. In the embodiment, the "predetermined position" refers to the display position of the three-dimensional display image IMb when switching from two-dimensional display to three-dimensional display is completed, and refers to the position where the three-dimensional display image IMb appears to sufficiently pop out from the display 10a as seen by the driver 200. The predetermined position may be set in advance according to the vehicle 100 in which the vehicular display device 1 is mounted, or may be set by the driver 200 adjusting the way the display image IM appears.

[0017] Furthermore, for example, when the display device 10 is performing a 3D display, if the control unit 11 determines that the line of sight of the driver 200 is not directed toward the display device 10, the control unit 11 performs a second switching control to switch the 3D display to a 2D display. In the second switching control, as shown by the arrow Y2 in Fig. 5, the display device 10 performs a 3D display in which a 3D display image IMb, which is three-dimensionally displayed as if stationary at a predetermined position, recedes toward the display 10a from a predetermined position between the display 10a and the driver 200, and then switches the 3D display image IMb to a 2D display image IMa.

[0018] In the embodiment, the apparent movement speed of the three-dimensional display image IMb in the second switching display when the three-dimensional display image IMb is three-dimensionally displayed so as to recede from a predetermined position toward the display 10a is slower than the apparent movement speed of the three-dimensional display image IMb in the first switching display when the three-dimensional display image IMb is three-dimensionally displayed so as to protrude from the display 10a toward the driver 200. In other words, in the first switching display, the three-dimensional display is performed so that the three-dimensional display image IMb moves relatively "fast," and in the second switching display, the three-dimensional display is performed so that the three-dimensional display image IMb moves relatively "slow."

[0019] Fig. 6 is a graph showing the frame rate (fps) of the display device 10 on the horizontal axis and the display movement speed (mm / s) of the 3D display image on the vertical axis. The display movement speed (mm / s) of the 3D display image on the vertical axis of Fig. 6 represents the apparent movement speed of the 3D display image IMb, which is displayed in 3D so as to move in the forward and backward directions when viewed from the driver 200 in the first switching display or the second switching display.

[0020] In the embodiment, when the frame rate (fps) is "x" and the display movement speed (mm / s) is "y", if the three-dimensional display image IMb is to be moved "slowly", the three-dimensional display image IMb is moved so that y / x is less than 0.5. If the three-dimensional display image IMb is to be moved "fast", the three-dimensional display image IMb is moved so that y / x is 0.5 or more.

[0021] In the embodiment, the control unit 11 has, as a criterion for determining whether the line of sight of the driver 200 is directed toward the display 10a, a frame-shaped first region RE1 that surrounds the display 10a from above, below, left, and right, and a second region RE2 that surrounds the display 10a from above, below, left, and right and is located inside the first region RE1, as shown in Fig. 7. The control unit 11 determines that the line of sight of the driver 200 has averted from the display device 10 (the line of sight of the driver 200 is not directed toward the display device 10) when the line of sight of the driver 200 moves from inside the first region RE1 to outside the first region RE1. Furthermore, the control unit 11 determines that the line of sight of the driver 200 is directed toward the display device 10 when the line of sight of the driver 200 moves from outside the second region RE2 to inside the second region RE2.

[0022] If one region is used as the criterion for determining whether the line of sight of the driver 200 is directed toward the display 10a, small movements of the line of sight of the driver 200 at the boundary between the regions will result in frequent switching between the two-dimensional display and the three-dimensional display. In the embodiment, whether the line of sight of the driver 200 is directed toward the display 10a is determined using two criteria, the first region RE1 and the second region RE2, so that frequent switching between the two-dimensional display and the three-dimensional display can be suppressed even if the line of sight of the driver 200 moves small movements.

[0023] Next, switching between 3D display and 2D display of the vehicle display device 1 will be described with reference to Fig. 8. The display 10a of the display device 10 according to the embodiment includes a panel unit that emits display light for the display image IM, and a barrier unit that is disposed between the panel unit and the driver 200. The panel unit is configured to display, as the display image IM, a parallax image that includes a left-eye image IML and a right-eye image IMR having parallax with respect to the left-eye image IML. The barrier unit is an optical element that defines the traveling direction of the display light emitted from the panel unit.

[0024] 8, the panel unit of the display 10a includes a pixel column 10aa for displaying the left-eye image IML and a pixel column 10ab for displaying the right-eye image IMR, and the pixel columns 10aa and 10ab are arranged alternately pixel by pixel along the left-right direction of the vehicle 100. The barrier unit is, for example, a parallax barrier, and is configured to emit display light for the left-eye image IML from the panel unit toward the left eye of the driver 200, and to emit display light for the right-eye image IMR from the panel unit toward the right eye of the driver 200. Note that the barrier unit may be a lenticular lens configured to refract the display light for the left-eye image IML emitted from the panel unit toward the left eye of the driver 200, and to refract the display light for the right-eye image IMR emitted from the panel unit toward the right eye of the driver 200.

[0025] The control unit 11 reads the left eye image IML and the right eye image IMR stored in the ROM 11b, and displays the left eye image IML on the pixel row 10aa of the display 10a and the right eye image IMR on the pixel row 10ab of the display 10a, thereby displaying a composite image (parallax image) on the panel unit of the display 10a. The composite image (parallax image) emitted from the panel unit enters the eyes of the driver 200 through the barrier unit, and the driver 200 visually recognizes the display image IM as a stereoscopically displayed three-dimensional display image IMb.

[0026] In the first switching control, the control unit 11 performs three-dimensional display by increasing the parallax between the left-eye image IML and the right-eye image IMR in the two-dimensional display image IMa, which is a planar display image IM with substantially no parallax between the left-eye image IML and the right-eye image IMR, to a predetermined value. With this control, the three-dimensional display image IMb appears to jump out from the display 10a toward the driver 200 as seen by the driver 200, and appears stationary at a predetermined position between the display 10a and the driver 200.

[0027] Specifically, the control unit 11 performs the first switching control by displaying the image IML for the left eye and the image IMR for the right eye so that the angle (convergence angle) formed between a straight line connecting one element (e.g., a point) of the image IML for the left eye and the left eye of the driver 200 and a straight line connecting an element in the image IMR for the right eye corresponding to one element of the image IML for the left eye and the right eye of the driver 200 becomes larger.

[0028] In other words, if the convergence angle when performing 2D display is θ1 and the convergence angle when performing 3D display is θ2, the parallax between the image for the left eye IML and the image for the right eye IMR corresponds to the value of |θ1-θ2|.

[0029] For example, in the first switching control, the control unit 11 displays the left eye image IML and the right eye image IMR so that the convergence angle θ2 is larger than the convergence angle θ1, thereby increasing the parallax between the left eye image IML and the right eye image IMR, and the display image IM is displayed three-dimensionally as if it were popping out from the display 10a when viewed by the driver 200. In other words, the control unit 11 increases the parallax between the left eye image IML and the right eye image IMR to a predetermined value corresponding to a "predetermined position" which is the switching completion position when switching from two-dimensional display to three-dimensional display, thereby moving and displaying the three-dimensional display image IMb to a predetermined position.

[0030] Also, for example, in the second switching control, the control unit 11 displays the left eye image IML and the right eye image IMR so that the convergence angle θ2 decreases to the convergence angle θ1, thereby reducing the parallax between the left eye image IML and the right eye image IMR, and the 3D display image IMb is displayed so as to recede from a predetermined position between the display 10a and the driver 200 toward the display 10a. Then, when the value of |θ1-θ2| finally becomes substantially 0, the 3D display image IMb is displayed as the 2D display image IMa.

[0031] At this time, the speed of change of the parallax when reducing the parallax in the second switching control is set slower than the speed of change of the parallax when increasing the parallax in the first switching control. With this setting, the apparent movement speed of the three-dimensional display image IMb when the three-dimensional display image IMb is three-dimensionally displayed so as to recede from a predetermined position between the display 10a and the driver 200 toward the display 10a is slower than the apparent movement speed of the three-dimensional display image IMb when the three-dimensional display image IMb is three-dimensionally displayed so as to pop out from the display 10a toward the driver 200.

[0032] In the second switching control, the control unit 11 may change the 3D display to the 2D display, and then further hide either the left eye image IML or the right eye image IMR. In the embodiment, the control unit 11 reads only the left eye image IML out of the left eye image IML and the right eye image IMR from the ROM 11b and displays it on the display 10a. By this control, the control unit 11 does not display the right eye image IMR on the display 10a, thereby reducing the load on the control unit 11.

[0033] Furthermore, even if the image for the right eye IMR is hidden, part of the display light of the image for the left eye IML enters the right eye of the driver 200, and during the second switching control, the driver 200's line of sight is not directed toward the display 10a, so the display image IM is unlikely to cause discomfort to the driver 200, and the load on the control unit 11 can be effectively reduced.

[0034] Next, an example of the operation of the vehicular display device 1 will be described with reference to the flowchart of Fig. 9. First, the vehicular display device 1 acquires an image captured by the face detection camera 12 (step ST1). Then, the vehicular display device 1 detects the eye position and gaze direction of the driver 200 from the image captured by the face detection camera 12 (step ST2).

[0035] Thereafter, the control unit 11 of the vehicular display device 1 detects whether the line of sight of the driver 200 has moved from the display 10a to a location other than the display 10a (for example, the scenery ahead of the vehicle 100) based on the detected direction of the driver's line of sight (step ST3). If the control unit 11 detects that the line of sight of the driver 200 has moved from the display 10a to a location other than the display 10a, the process proceeds to step ST4. On the other hand, if the control unit 11 does not detect that the line of sight of the driver 200 has moved from the display 10a to a location other than the display 10a, the process proceeds to step ST5.

[0036] When the driver 200's line of sight is directed toward the display 10a, the display image IM is three-dimensionally displayed as a three-dimensional display image IMb located at a predetermined position between the display 10a and the driver 200, as viewed from the driver 200. In step ST4, the control unit 11 performs a display in which the three-dimensional display image IMb moves so as to "slowly" approach the display 10a. Then, the control unit 11 determines whether the three-dimensional display image IMb has reached the display 10a (step ST6). If the control unit 11 determines that the three-dimensional display image IMb has not reached the display 10a, steps ST4 and ST5 are repeated until the three-dimensional display image IMb reaches the display 10a and becomes a two-dimensional display image IMa. If the control unit 11 determines in step ST6 that the three-dimensional display image IMb has reached the display 10a, the control unit 11 ends the display in which the three-dimensional display image IMb moves so as to "slowly" approach the display 10a (step ST7). This operation causes the two-dimensional display image IMb to be displayed on the display 10a. Thereafter, the control unit 11 returns to step ST1 and performs the process.

[0037] In step ST5, the control unit 11 determines whether the line of sight of the driver 200 has moved from a location other than the display 10a (for example, the scenery ahead of the vehicle 100) to the display 10a. If the control unit 11 determines that the line of sight of the driver 200 has moved from a location other than the display 10a (for example, the scenery ahead of the vehicle 100) to the display 10a, the process proceeds to step ST8. On the other hand, if the control unit 11 determines that the line of sight of the driver 200 has not moved from a location other than the display 10a (for example, the scenery ahead of the vehicle 100) to the display 10a, the process proceeds to step ST9.

[0038] When the driver 200 is not looking at the display 10a (for example, when the driver 200 is looking at the scenery ahead of the vehicle 100), the display image IM is displayed as a two-dimensional display image IMa that is displayed flatly on the display 10a as seen by the driver 200. In step ST8, the control unit 11 performs three-dimensional display in which the display image IM moves from the display 10a toward the driver 200 as if it is jumping out. Here, the control unit 11 displays the display image IM so that it moves "fast" from the display 10a toward the driver 200.

[0039] Thereafter, the control unit 11 determines whether or not the display image (three-dimensional display image IMb) has reached a predetermined position between the display 10a and the driver 200 as viewed from the driver 200 (step ST10). If the control unit 11 determines that the three-dimensional display image IMb has not reached the predetermined position between the display 10a and the driver 200 as viewed from the driver 200, it repeats steps ST8 and ST10 until the three-dimensional display image IMb reaches the predetermined position. If the control unit 11 determines that the three-dimensional display image IMb has reached the predetermined position between the display 10a and the driver 200 as viewed from the driver 200, it ends the display of the three-dimensional display image IMb moving from the display 10a toward the driver 200 as if it were popping out, and displays the three-dimensional display image IMb stationary at a predetermined position as viewed from the driver 200 (step ST11). Thereafter, the control unit 11 returns to step ST1 and performs the process.

[0040] In step ST9, the control unit 11 continues to display the currently displayed display image (the two-dimensional display image IMa or the three-dimensional display image IMb). After that, the control unit 11 returns to step ST1 and performs the process.

[0041] In other words, the vehicle display device 1 of the embodiment performs second switching control corresponding to steps ST4, ST6, and ST7, first switching control corresponding to steps ST8, ST10, and ST11, or control to maintain the currently displayed display image IM corresponding to step ST9, depending on the results of the judgment in steps ST3 and ST5.

[0042] In the above explanation, an example was used in which the first switching control (steps ST4, ST6, ST7) and the second switching control (steps ST8, ST10, ST11) do not include a step of detecting the movement of the driver's line of sight (direction of the line of sight), but this configuration is not limited to this.

[0043] For example, a step of detecting a movement of the line of sight (direction of the line of sight) of the driver 200 may be included during the first switching control (steps ST4, ST6, ST7) and the second switching control (steps ST8, ST10, ST11).

[0044] In this case, for example, if the control unit 11 determines that the line of sight of the driver 200 is not directed toward the display 10a (the line of sight of the driver 200 has moved from the display 10a to a location other than the display 10a) while the first switching control is being executed, the control unit 11 stops the first switching control and then moves the 3D display image IMb closer to the display 10a, thereby performing control to return the 3D display to the 2D display. That is, for example, if the control unit 11 determines that the line of sight of the driver 200 is not directed toward the display while the first switching control is being executed, the control unit 11 stops the first switching control and then performs third switching control to return the 3D display to the 2D display by reducing the parallax between the left eye image IML and the right eye image IMR.

[0045] At this time, the speed of change of the parallax when reducing the parallax in the third switching control is set to be slower than the speed of change of the parallax when increasing the parallax in the first switching control. For example, the speed of change of the parallax when reducing the parallax in the third switching control is set to be substantially the same as the speed of change of the parallax when reducing the parallax in the second switching control.

[0046] Furthermore, for example, when the control unit 11 determines that the line of sight of the driver 200 is directed toward the display 10a (the line of sight of the driver 200 has moved from a location other than the display 10a to the display 10a) while the second switching control is being executed, the control unit 11 stops the second switching control and then performs control to move the three-dimensional display image IMb so that it pops out from the display 10a toward the driver 200, and display the three-dimensional display image IMb at a predetermined position. That is, for example, when the control unit 11 determines that the line of sight of the driver 200 is directed toward the display 10a while the second switching control is being executed, the control unit 11 stops the second switching control and then performs fourth switching control to return the three-dimensional display image IMb to a predetermined position and display it by increasing the parallax between the left-eye image IML and the right-eye image IMR.

[0047] At this time, the speed of change of the parallax when increasing the parallax in the fourth switching control is set to be slower than the speed of change of the parallax when decreasing the parallax in the second switching control. For example, the speed of change of the parallax when increasing the parallax in the fourth switching control is set to be substantially the same as the speed of change of the parallax when increasing the parallax in the first switching control.

[0048] As described above, the vehicle display device 1 according to the embodiment is mounted on the vehicle 100 and includes a display device 10 configured to perform two-dimensional display in which the display image IM is displayed in a planar manner on the display 10a, and three-dimensional display in which a left-eye image IML directed to the left eye of the driver 200 of the vehicle 100 and a right-eye image IMR directed to the right eye of the driver 200 are displayed on the display 10a, and the display image IM is displayed three-dimensionally by parallax between the left-eye image IML and the right-eye image IMR; an acquisition unit 12 that acquires the line-of-sight direction of the driver 200; and a control unit 11 that determines whether the line-of-sight of the driver 200 is directed to the display 10a from the line-of-sight direction of the driver 200 acquired by the acquisition unit 12, and controls the display device 10. The control unit 11 When the control unit 11 determines that the driver's line of sight (200) is directed toward the display 10a while the two-dimensional display is being performed, it performs a first switching control to switch the two-dimensional display to a three-dimensional display by increasing the parallax between the image for the left eye (IML) and the image for the right eye (IMR) to a predetermined value, and when the control unit 11 determines that the driver's line of sight (200) is not directed toward the display 10a while the three-dimensional display is being performed, it performs a second switching control to switch the three-dimensional display to a two-dimensional display by decreasing the parallax between the image for the left eye (IML) and the image for the right eye (IMR) from a predetermined value, and the speed of change in the parallax when decreasing the parallax in the second switching control is slower than the speed of change in the parallax when increasing the parallax in the first switching control.

[0049] The vehicular display device 1 according to the embodiment can prevent the driver 200, who is directing his / her gaze to a location other than the display 10a, from being attracted to the display 10a by slowing the speed of change of the parallax when reducing the parallax in the second switching control compared to the speed of change of the parallax when increasing the parallax in the first switching control. Furthermore, by switching from 3D display to 2D display when the driver 200 is not directing his / her gaze to the display 10a, the load on the control unit 11 can be reduced. Furthermore, by quickly performing the first switching control, it is possible to prevent the driver 200, who is directing his / her gaze to the display 10a, from feeling annoyed. Therefore, the vehicular display device 1 according to the embodiment can appropriately switch between 3D display and 2D display depending on the situation.

[0050] In addition, in the vehicle display device 1 according to the embodiment, in the second switching control, the control unit 11 reduces the parallax between the left eye image IML and the right eye image IMR to create a two-dimensional display, and then hides either the left eye image IML or the right eye image IMR.

[0051] The vehicle display device 1 according to the embodiment can further reduce the load on the control unit 11 by not displaying either the image for the left eye IML or the image for the right eye IMR when performing 2D display.

[0052] Furthermore, in the vehicle display device 1 according to the embodiment, if the control unit 11 determines that the driver 200's line of sight is not directed toward the display 10a while the first switching control is being executed, it stops the first switching control and then executes a third switching control to return to a two-dimensional display by reducing the parallax between the left eye image IML and the right eye image IMR, and the speed at which the parallax changes when reducing the parallax in the third switching control is slower than the speed at which the parallax changes when increasing the parallax in the first switching control.

[0053] The vehicle display device 1 according to the embodiment can reduce the load on the control unit 11 by canceling the first switching control and returning to two-dimensional display when the driver 200 moves their gaze away from the display 10a while the first switching control is being executed.

[0054] Furthermore, in the vehicle display device 1 according to the embodiment, if the control unit 11 determines that the driver 200's line of sight is directed toward the display 10a while the second switching control is being executed, it stops the second switching control and then executes a fourth switching control in which the disparity between the left eye image IML and the right eye image IMR is returned to a predetermined value to provide a three-dimensional display, and the speed at which the disparity changes when the disparity is increased in the fourth switching control is faster than the speed at which the disparity changes when the disparity is decreased in the second switching control.

[0055] The vehicle display device 1 according to the embodiment can reduce the possibility of the driver 200 being annoyed by the display switching by stopping the second switching control and quickly returning the three-dimensional display image IMb to a predetermined position when the driver 200 turns his / her gaze toward the display 10a while the second switching control is being executed.

[0056] Furthermore, in the vehicle display device 1 according to the embodiment, the three-dimensional display is a pop-out display in which the entire display image IM is displayed so as to appear to be in front of the display 10a when viewed from the driver 200.

[0057] In the vehicular display device 1 that displays a display image IM in three dimensions so that the display image IM appears to jump out toward the driver 200, the first and second switching controls enable appropriate switching between three-dimensional display and two-dimensional display.

[0058] In the embodiment, the vehicle display device 1 is described as being configured such that the display device 10 and the face detection camera 12 serving as the acquisition unit are integrated, but the present invention is not limited to this configuration. For example, the face detection camera may be an in-vehicle camera mounted on the vehicle 100 as a separate unit from the vehicle display device 1. In this case, the vehicle display device 1 may acquire, via the acquisition unit 12, images captured by the in-vehicle camera and acquire the gaze direction of the driver 200 from the images.

[0059] [Modification of the embodiment] A modified example of the embodiment will be described below. Fig. 10 is a schematic diagram showing a first switching control of the vehicle display device according to the modified example of the embodiment, and Fig. 11 is a schematic diagram showing a second switching control of the vehicle display device according to the modified example of the embodiment.

[0060] In the vehicular display device 1 of the modified example, as the first switching control, the control unit 11 switches the 2D display image IMa to the 3D display image IMc as shown by the arrow Y3 in Fig. 10, and performs depth display to three-dimensionally display the 3D display image IMc so that it recedes to a predetermined position on the back side of the display 10a as seen by the driver 200. Note that in the modified example, the "predetermined position" refers to a position where the 3D display image IMb appears sufficiently far back on the surface of the display 10a as seen by the driver 200.

[0061] Specifically, in the first switching control, the control unit 11 displays the left eye image IML and the right eye image IMR so that the convergence angle θ2 is smaller than the convergence angle θ1, thereby increasing the parallax between the left eye image IML and the right eye image IMR, and the display image IM is displayed as if it is moving toward the back of the display 10a as seen by the driver 200. The control unit 11 increases the parallax between the left eye image IML and the right eye image IMR (decreases the convergence angle θ2), and when the 3D display image IMb reaches a predetermined position, the control unit 11 displays the 3D display image IMb stationary at that position. In other words, the control unit 11 increases the parallax between the left eye image IML and the right eye image IMR to a predetermined value corresponding to the "predetermined position," thereby moving the 3D display image IMb to the predetermined position and displaying it.

[0062] Furthermore, in the second switching control, the control unit 11 displays the left eye image IML and the right eye image IMR so that the convergence angle θ2 increases to the convergence angle θ1, thereby reducing the parallax between the left eye image IML and the right eye image IMR, and the 3D display image IMb is displayed moving from the back of the display 10a (a predetermined position) toward the driver 200, as shown by the arrow Y4 in Fig. 11. Finally, the value of |θ1-θ2|, which corresponds to the parallax between the left eye image IML and the right eye image IMR, becomes substantially 0, and the image is displayed as the 2D display image IMa.

[0063] That is, in the vehicle display device 1 of the modified example, a three-dimensional display with depth is performed instead of the pop-out display of the above-described embodiment. The other configurations are the same as those of the above-described embodiment.

[0064] As described above, in the vehicle display device 1 according to the modified example, the three-dimensional display is a depth display that displays the entire display image (IM) as if it were located further back than the display (10a) when viewed from the driver (200).

[0065] In a vehicle display device 1 that displays a display image IM in three dimensions by moving it to the back of the display 10a as seen by the driver 200, by performing first and second switching controls, it is possible to appropriately switch between three-dimensional display and two-dimensional display.

[0066] The contents disclosed in the above-described embodiments and modifications can be implemented in appropriate combinations. [Explanation of symbols]

[0067] 1: Vehicle display device 10; indicator, 10a: display 11: control unit, 12: acquisition unit 100: Vehicle, 200: Driver IM: Display image, IMa: 2D display image, IMb, IMc: 3D display image IML: Left eye image, IMR: Right eye image

Claims

1. a display device mounted on a vehicle and configured to perform two-dimensional display in which a display image is displayed in a planar manner on a display, and three-dimensional display in which a left-eye image directed toward the left eye of a driver of the vehicle and a right-eye image directed toward the right eye of the driver are displayed on the display, and the display image is displayed three-dimensionally by parallax between the left-eye image and the right-eye image; an acquisition unit that acquires the driver's line of sight; a control unit that determines whether the line of sight of the driver is directed toward the display based on the direction of the line of sight of the driver acquired by the acquisition unit, and controls the display device; Equipped with when it is determined that the line of sight of the driver is directed toward the display while the two-dimensional display is being performed, the control unit performs a first switching control to switch the two-dimensional display to the three-dimensional display by increasing the parallax between the image for the left eye and the image for the right eye to a predetermined value; when it is determined that the line of sight of the driver is not directed toward the display while the three-dimensional display is being performed, the control unit performs second switching control to switch the three-dimensional display to the two-dimensional display by reducing the parallax between the image for the left eye and the image for the right eye from the predetermined value; When the control unit determines that the line of sight of the driver is not directed toward the display during execution of the first switching control, the control unit stops the first switching control and then performs third switching control to return to the two-dimensional display by reducing the parallax between the image for the left eye and the image for the right eye; a speed of change of the parallax when the parallax is reduced in the second switching control is slower than a speed of change of the parallax when the parallax is increased in the first switching control, a speed of change of the parallax when the parallax is reduced in the third switching control is slower than a speed of change of the parallax when the parallax is increased in the first switching control. A vehicle display device comprising:

2. In the second switching control, the control unit performs the two-dimensional display by gradually reducing the parallax between the image for the left eye and the image for the right eye, and then hides either the image for the left eye or the image for the right eye. The vehicle display device according to claim 1 .

3. When the control unit determines that the line of sight of the driver is directed toward the display while the second switching control is being executed, the control unit stops the second switching control and then executes a fourth switching control in which the parallax between the image for the left eye and the image for the right eye is returned to the predetermined value to perform the three-dimensional display; The speed of change of the parallax when increasing the parallax in the fourth switching control is faster than the speed of change of the parallax when decreasing the parallax in the second switching control. The vehicle display device according to claim 1 or 2.

4. The three-dimensional display is a pop-out display in which the entire display image is displayed so as to appear in front of the display as viewed from the driver, or a depth display in which the entire display image is displayed so as to appear behind the display as viewed from the driver. The vehicle display device according to claim 1 or 2.

5. The three-dimensional display is a pop-out display in which the entire display image is displayed so as to appear in front of the display as viewed from the driver, or a depth display in which the entire display image is displayed so as to appear behind the display as viewed from the driver. The vehicle display device according to claim 3 .

6. A display device mounted on a vehicle and configured to perform two-dimensional display in which a display image is displayed in a flat manner on a display, and three-dimensional display in which a left-eye image directed toward the left eye of a driver of the vehicle and a right-eye image directed toward the right eye of the driver are displayed on the display, and the display image is displayed in three dimensions due to the parallax between the left-eye image and the right-eye image; an acquisition unit that acquires the driver's line of sight; a control unit that determines whether the line of sight of the driver is directed toward the display based on the direction of the line of sight of the driver acquired by the acquisition unit, and controls the display device; Equipped with when it is determined that the line of sight of the driver is directed toward the display while the two-dimensional display is being performed, the control unit performs a first switching control to switch the two-dimensional display to the three-dimensional display by increasing the parallax between the image for the left eye and the image for the right eye to a predetermined value; when it is determined that the line of sight of the driver is not directed toward the display while the three-dimensional display is being performed, the control unit performs second switching control to switch the three-dimensional display to the two-dimensional display by reducing the parallax between the image for the left eye and the image for the right eye from the predetermined value; When the control unit determines that the line of sight of the driver is directed toward the display while the second switching control is being executed, the control unit stops the second switching control and then executes a fourth switching control in which the parallax between the image for the left eye and the image for the right eye is returned to the predetermined value to perform the three-dimensional display; a speed of change of the parallax when the parallax is reduced in the second switching control is slower than a speed of change of the parallax when the parallax is increased in the first switching control, a speed of change of the parallax when increasing the parallax in the fourth switching control is faster than a speed of change of the parallax when decreasing the parallax in the second switching control. A vehicle display device comprising:

Images