Display device for vehicle

Abstract

To provide a display device for a vehicle in which a driver is easy to recognize that a design is displayed even when the design is displayed in a one-eye region.SOLUTION: A virtual image visually recognized by a driver 200 includes: a both-eye region CB being a region visually recognized by both eyes of the driver 200; and a one-eye region CRL being a region visually recognized by only one eye of the driver 200. When a direction design D1 notifying a direction is displayed, a control unit 23 causes the direction design D1 to be displayed from the one-eye region CRL over to the both-eye region CB.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Conventionally, there have been known display devices for vehicles, such as head-up displays that allow a driver to view an image as a virtual image from the driver's eye position (eye point). For example, Patent Document 1 describes a display device that improves visibility by making the luminance of a one-eye region of an image that is visible only with one eye higher than the luminance of a both-eye region that is visible with both eyes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-130771 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide a display device for a vehicle that makes it easy for the driver to notice that a design is displayed, even when the design is displayed in one eye area. [Means for solving the problem]

[0005] In order to achieve the above object, the vehicle display device according to the present invention has the following features. an image display unit that emits display light for an image; an optical system that projects display light emitted from the image display unit toward a reflective surface in front of a driver; A control unit that controls the image display unit, The image has a binocular region that is a region viewed by both eyes of the driver, and a one-eye region that is a region viewed by only one eye of the driver, The control unit, when displaying a direction design for notifying a direction, displays the direction design from the one-eye region to the both-eye regions. It is a display device for vehicles. Effect of the Invention

[0006] According to the present invention, a vehicle display device can be provided that allows a driver to easily notice that a design is displayed, even when the design is displayed in one eye area.

[0007] The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following description of the embodiment of the present invention (hereinafter, referred to as "embodiment") with reference to the accompanying drawings. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing an embodiment of a display device for a vehicle according to the present invention. [Diagram 2] FIG. 2 is a diagram showing the optical positional relationship between the virtual image, the second mirror, and the driver's eyes when the driver's eyes are located at the center of the eye box in the left-right direction. [Diagram 3] FIG. 3 is a diagram showing the arrangement of each area of ​​a virtual image viewed by a driver. [Figure 4] FIG. 4 is a flowchart for explaining the operation of the control unit constituting the vehicle display device shown in FIG. [Diagram 5] FIG. 5 is a diagram showing an example of a virtual image visually recognized by a driver. [Figure 6] FIG. 6 is a diagram showing an example of a virtual image visually recognized by a driver. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0010] For the sake of convenience, the following definitions are used for the terms "front", "rear", "left", "right", "upper" and "lower" as shown in Figures 1 and 2. The "front-rear direction", "left-right direction" and "up-down direction" are mutually orthogonal. The left-right direction corresponds to the "horizontal direction" of the present invention.

[0011] As shown in Fig. 1, the vehicle display device 1 of this embodiment is mounted on a vehicle 100 and constitutes a head-up display. The vehicle display device 1 is disposed, for example, inside an instrument panel 101. The instrument panel 101 has an opening 101a that opens upward. The opening 101a faces a windshield 102 in the up-down direction of the vehicle 100.

[0012] The vehicle display device 1 has a housing 4, a cover 5, an image display unit 20, a control unit 23, and an optical system 25. The image display unit 20, the control unit 23, and the optical system 25 are housed inside the housing 4. The housing 4 has a main body 2 and a lid member 3 that engages with the main body 2. The main body 2 has an opening that opens upward. The lid member 3 closes the opening of the main body 2 from above. The lid member 3 has a wall portion 30 that faces the opening 101a. The wall portion 30 has an opening 31 that opens upward. The housing 4 is arranged so that the opening 31 faces the opening 101a. The cover 5 is a plate-shaped member that closes the opening 31 of the lid member 3. The cover 5 is formed of a translucent resin such as polycarbonate (PC) or acrylic.

[0013] The image display unit 20 is a device that emits display light 70 of an image. The illustrated image display unit 20 is a liquid crystal display device, for example, a TFT-LCD (Thin Film Transistor-Liquid Crystal Display). However, the image display unit 20 is not limited to a liquid crystal display device. The image display unit 20 may be, for example, a device that scans laser light to generate an image on a transparent screen.

[0014] The optical system 25 has a first mirror 21 and a second mirror 22. The first mirror 21 reflects the display light 70 emitted from the image display unit 20 toward the second mirror 22. The first mirror 21 is, for example, a flat mirror. The second mirror 22 reflects the display light 70 toward the windshield 102. The shape of the reflecting surface of the second mirror 22 is, for example, a free-form surface. The second mirror 22 is, for example, a concave mirror that magnifies the display light 70.

[0015] The display light 70 reflected by the second mirror 22 passes through the opening 31 and the opening 101a, and is reflected by the reflecting surface 102a of the windshield 102 toward the driver 200. A virtual image is formed by the display light 70 incident on the eye 201 of the driver 200. The instrument panel 101 is provided with a cylindrical wall portion 103. The wall portion 103 surrounds the optical path of the display light 70 traveling from the opening 31 toward the opening 101a.

[0016] 2, the image displayed on the image display unit 20 and displayed as a virtual image to the driver 200 has a both-eye region CB which is a region that is viewed by both eyes of the driver 200, a right-eye region CR which is a region that is not viewed by the left eye and is only viewable by the right eye, and a left-eye region CL which is a region that is not viewed by the right eye and is only viewable by the left eye. The right-eye region CR and the left-eye region CL are regions on the left-right end side of the both-eye region CB. Hereinafter, the right-eye region CR and the left-eye region CL are collectively referred to as the "one-eye region CRL."

[0017] Fig. 3 shows the arrangement of the regions of the virtual image superimposed on the foreground of the driver 200. As shown in Fig. 3, the left edge region of the virtual image corresponds to the right eye region CR, the central region of the virtual image corresponds to the both eye region CB, and the right side region of the virtual image corresponds to the left eye region CL.

[0018] The control unit 23 has a control circuit configured to control the image display unit 20. The control unit 23 is mounted on, for example, a control board arranged inside the housing 4. The control unit 23 controls the image display unit 20 to generate an image according to, for example, a program stored in advance.

[0019] Vehicle 100 has a driver monitor 104. Driver monitor 104 includes a camera arranged in front of driver 200. Driver monitor 104 captures an image of driver 200 to generate a driver image. Driver monitor 104 detects the position of the head of driver 200 and the position of eyes 201 of driver 200 (viewpoint position) based on the driver image. The detection result by driver monitor 104 is sent to control unit 23.

[0020] The control unit 23 sets both-eye areas CB and one-eye areas CRL (see FIG. 2) on the display screen of the image display unit 20, and changes the luminance between the both-eye areas CB and one-eye areas CRL. In addition, as shown in FIG. 3, when the control unit 23 detects an approaching object 10, the control unit 23 displays a direction design D1 notifying the approaching direction of the approaching object 10 from the one-eye area CRL to the both-eye areas CB. In the example shown in FIG. 3, the approaching object 10, which is a pedestrian, is approaching the vehicle 100 from the left to the right. Therefore, the control unit 23 displays a direction design D1 notifying the direction from left to right from the right eye area CR located on the left side of the both-eye areas CB to the both-eye areas CB. In addition, when the approaching object 10 is approaching the vehicle 100 from the right to the left, the control unit 23 displays a direction design D1 notifying the direction from right to left from the left eye area CL located on the right side of the both-eye areas CB to the both-eye areas CB.

[0021] Next, the details of the above-mentioned both-eyes region CB and one-eye region CRL will be described with reference to FIG. 2. FIG. 2 is a diagram showing the optical positional relationship between a virtual image, a second mirror, and an eye 201 of the driver 200. The position of the eye 201 shown in FIG. 2 is the center position in the left-right direction in the eye box EB. The eye box EB is a range assumed in advance as a range within which the position of the eye 201 moves. The eye box EB has a predetermined width in the left-right direction. The vehicle display device 1 is configured so that an image can be viewed by the driver 200 when the eye 201 is inside the eye box EB.

[0022] 2, when the light reflected by the entire surface of the second mirror 22 is viewed, the left end position of the right eye region CR is on an extension of a light ray "L1" connecting the right eye of the driver 200 and the left end position of the second mirror 22. Also, the right end position of the left eye region CL is on an extension of a light ray "L2" connecting the left eye of the driver 200 and the right end position of the second mirror 22. Note that the driver 200 cannot view the left end position of the right eye region CR with the left eye, and cannot view the right end position of the left eye region CL with the right eye.

[0023] In addition, the left end position of the eye region CB is on an extension line of the configuration "L3" that connects the left eye of the driver 200 and the left position of the second mirror 22. The right end position of the eye region CB is on an extension line of the configuration "L4" that connects the right eye of the driver 200 and the left position of the second mirror 22.

[0024] As is clear from Figure 2, when the viewpoint position of driver 200 is in the center position in the left-right direction of eye box EB, the eye area CB, right eye area CR and left eye area CL can be set based on the distance between the eyes of driver 200 and the position of optical system 25.

[0025] Next, the operation of the control unit 23 outlined above will be described with reference to the flowchart of Fig. 4. First, the control unit 23 measures the distance between the eyes of the driver 200 based on the driver image from the driver monitor 104 (S1).

[0026] Next, the control unit 23 sets the both-eye area CB and one-eye area CRL on the display screen of the image display unit 20 when the eye 201 of the driver 200 is in the center position in the left-right direction of the eye box EB based on the measured distance between the eyes and the known position of the optical system 25 (S2).

[0027] When an approaching object 10 is detected from the detection result by the vehicle's surroundings monitoring device (Y in S3), the control unit 23 displays the directional design D1 only in the one-eye region CRL (S4), as shown in the upper part of Fig. 5 and Fig. 6. Thereafter, when the distance to the approaching object 10 becomes equal to or less than a predetermined distance and the possibility of a collision with the approaching object 10 increases (Y in S5), the control unit 23 displays the directional design D1 from the one-eye region CRL to both-eye regions CB (S6), as shown in the lower part of Fig. 5 and Fig. 6.

[0028] In S6, the control unit 23 may shift the position of the directional design D1 displayed only in the one-eye region CRL toward the both-eye region CB and display it from the one-eye region CRL to the both-eye region CB as shown in Fig. 5. In addition, the control unit 23 may increase the size of the directional design D1 and display it from the one-eye region CRL to the both-eye region CB as shown in Fig. 6.

[0029] At this time, the control unit 23 may display the directional design D1 in a flowing or blinking manner, thereby displaying the directional design D1 that changes with time.

[0030] Thereafter, the control unit waits until the approaching object 10 is no longer detected (Y in S7), and then erases the display of the directional design D1 (S8), and returns to S3.

[0031] When notifying a direction, particularly a left or right direction, it is easier for the driver 200 to grasp the direction by displaying the direction design D1 in one eye area CRL corresponding to the direction to be notified, rather than displaying only in both eye areas CB. According to the above-described embodiment, when displaying the direction design D1 for notifying a direction, the control unit 23 displays the direction design D1 from the one eye area CRL to both eye areas CB. This makes it easier for the driver 200 to notice that the direction design D1 has been displayed, even if it is desired to display the direction design D1 in the one eye area CRL.

[0032] According to the above-described embodiment, the control unit 23 displays the direction design D1 only in one eye area when the distance to the approaching object 10 is greater than a predetermined distance, and changes the position and size of the direction design D1 to display it from the one eye area CRL to both eye areas CB when the distance to the approaching object 10 is equal to or less than the predetermined distance. This makes it possible to reliably inform the driver 200 of the approaching direction when the distance to the approaching object 10 is equal to or less than the predetermined distance and the possibility of a collision increases.

[0033] According to the above-described embodiment, the directional design D1 is a design that changes over time by being displayed in a flowing or blinking manner. Therefore, even if the directional design D1 is displayed across both the eye area CB and the single eye area CRL, it is possible to reduce discomfort.

[0034] The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, etc. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary as long as the present invention can be achieved, and are not limited.

[0035] According to the above-described embodiment, the control unit 23 sets the both-eyes region CB and one-eye region CRL when the eye is located at the center of the eye box EB in the left-right direction, but this is not limited to the above. The both-eyes region CB and one-eye region CRL are shifted to the left when the eye 201 is located to the right side of the eye box EB, and shifted to the right when the eye 201 is located to the left side of the eye box EB. Therefore, the control unit 23 may periodically measure the position (gaze position) of the eye 201 and reset the both-eyes region CB and one-eye region CRL set according to the position of the eye 201.

[0036] In the above embodiment, the case where the light reflected by the entire surface of the second mirror 22 is visually recognized by the driver 200 has been described, but the present invention is not limited to this. For example, the image may be cut off by the cover member 3. In this case, the both-eyes region CB and the one-eye region CRL are determined by lines connecting the eye 201 of the driver 200 and the right and left end positions of the opening 31 of the cover member 3.

[0037] In the above embodiment, the control unit 23 measures the distance between the eyes based on the driver image, and sets the both-eyes area CB, the one-eye area CRL, and the non-display area CN based on the measured distance between the eyes, but this is not limited to the above. The control unit 23 may set the both-eyes area CB, the one-eye area CRL, and the non-display area CN based on a predetermined average distance between the eyes without measuring the distance between the eyes.

[0038] According to the above-described embodiment, the direction design D1 is a design for notifying the approaching direction of the approaching object 10, but is not limited thereto. The direction design D1 may be a design for notifying the direction of a right turn, left turn, or lane change instruction of a navigation device.

[0039] According to the embodiment described above, the control unit 23 displays the directional design D1 only in the one-eye region CRL when the distance to the approaching object 10 is greater than a predetermined distance, and displays the directional design D1 from the one-eye region CRL to the both-eye region CB when the distance to the approaching object 10 is equal to or less than the predetermined distance, but this is not limited to this. The control unit 23 may display the directional design D1 from the one-eye region CRL to the both-eye region CB when the approaching object 10 is detected, regardless of the distance to the approaching object 10.

[0040] In addition, the control unit 23 may not display the directional design D1 in the boundary area between the one-eye area CRL and the both-eye area CB. An image displayed across the one-eye area CRL and the both-eye area CB is likely to give the driver 200 a sense of incongruity. For example, in the case of the directional design D1 in which multiple arrow tip designs are arranged at intervals as in the present embodiment, the sense of incongruity felt by the driver 200 can be reduced by displaying the design so that the boundary area is located between the arrow tip designs.

[0041] Here, the features of the above-mentioned embodiment of the display device for a vehicle according to the present invention will be briefly summarized and listed in the following [1] to [4].

[0042] [1] an image display unit (20) that emits image display light (70); an optical system (25) that projects display light (70) emitted from the image display unit (20) toward a reflecting surface in front of a driver (200); a control unit (23) that controls the image display unit (20), The image has a binocular region (CB) which is a region viewed by both eyes of the driver (200) and a single-eye region (CRL) which is a region viewed by only one eye of the driver (200), When displaying a direction design (D1) that notifies a direction, the control unit (23) displays the direction design (D1) from the one-eye region (CRL) to the both-eye region (CB). Vehicle display device (1).

[0043] According to the configuration of [1] above, when the control unit (23) displays the direction design (D1) that notifies the direction, the control unit (23) displays the direction design (D1) from the one-eye area (CRL) to the both-eye area (CB). This makes it easier for the driver (200) to notice that the direction design (D1) has been displayed, even if the driver wants to display the direction design (D1) in the one-eye area (CRL).

[0044] [2] A vehicle display device (1) according to the invention, When the control unit (23) detects an approaching object (10) to the vehicle, the control unit (23) displays the directional design (D1) notifying the approaching direction of the approaching object (10) from the one-eye region (CRL) to the both-eye region (CB). Vehicle display device (1).

[0045] According to the above configuration [2], the driver (200) can easily notice that the directional design (D1) notifying the driver of the approaching direction of the approaching object (10) is displayed.

[0046] [3] The vehicle display device (1) according to [2], When the distance to the approaching object (10) is greater than a predetermined distance, the control unit (23) displays the directional design (D1) only in the one-eye region (CRL), and when the distance to the approaching object (10) is equal to or less than the predetermined distance, the control unit (23) changes a position or size of the directional design (D1) and displays it from the one-eye region (CRL) to the both-eye region (CB). Vehicle display device (1).

[0047] According to the above configuration [3], when the distance to the approaching object (10) becomes equal to or less than a predetermined distance and the possibility of a collision increases, the driver (200) can be reliably notified of the approaching direction.

[0048] [4] A vehicle display device (1) according to the invention, The directional design (D1) is a design that changes over time. Vehicle display device (1).

[0049] According to the configuration [4] above, the directional design (D1) is a design that changes over time, so that the sense of incongruity can be reduced even if the directional design (D1) is displayed across both the both-eye area (CB) and the one-eye area (CRL). [Explanation of symbols]

[0050] 1 Vehicle display device 10 Approaching object 20 Image display unit 23 Control Unit 25 Optical system 70 display light 200 Drivers CB Eye area CRL single eye area D1 Directional design

Claims

1. an image display unit that emits display light for an image; an optical system that projects display light emitted from the image display unit toward a reflective surface in front of a driver; A control unit that controls the image display unit, The image has a binocular region that is a region viewed by both eyes of the driver, and a one-eye region that is a region viewed by only one eye of the driver, The control unit, when displaying a direction design for notifying a direction, displays the direction design from the one-eye region to the both-eye regions. Vehicle display device.

2. The display device for a vehicle according to claim 1, When the control unit detects an object approaching the vehicle, the control unit displays the directional design notifying the approaching direction of the object from the one eye region to the both eye regions. Vehicle display device.

3. The vehicle display device according to claim 2, The control unit displays the directional design only in the one-eye region when the distance to the approaching object is greater than a predetermined distance, and changes a position or size of the directional design and displays it from the one-eye region to both eye regions when the distance to the approaching object is equal to or less than the predetermined distance. Vehicle display device.

4. The display device for a vehicle according to claim 1, The directional design is a design that changes over time. Vehicle display device.

Images