JP2023147814A - Display device - Google Patents

Abstract

To provide a display system which can improve the visibility between a plurality of display devices.SOLUTION: A display system according to an embodiment comprises: a first display device which displays a first image that is visually recognized by a viewer by being superimposed on an actual scene in a first display region; a second display device which displays a second image that is visually recognized by the viewer without being superimposed on the actual scene in a second display region; and a display control unit which changes a color to a control color that makes a color of the second image approximate a color of the first image when a prescribed condition is satisfied. The first display device has a color gamut narrower than a color gamut of the second display device in a prescribed color system. The display control unit sets a color that is determined with coordinates located in a direction of making the color of the second image approximate white as the control color.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a display system for a vehicle or the like having a plurality of display devices.

BACKGROUND ART Conventionally, it is known that a plurality of display devices are arranged at a plurality of locations in a vehicle and are controlled in conjunction with each other.

Japanese Patent Application Publication No. 2011-230625

Vehicles are now equipped with head-up displays that can display information in a variety of display formats and large display panels that can display a large amount of information. Furthermore, in order to emphasize and convey the contents of particularly necessary information to the viewer, the same image may be displayed simultaneously on a plurality of display devices. However, if the mode of the display device is different, even if it is intended to display images with the same hue, there is a possibility that a difference in hue will occur between the images due to the color rendering properties unique to the display device.

The present disclosure has been made in consideration of such circumstances, and an object of the present disclosure is to provide a display system that can improve visibility between a plurality of display devices.

In order to solve the above-mentioned problems, the display system of the present disclosure includes a first display device that displays a first image in a first display area that is superimposed on the actual scene and is visible to the viewer, and a first display device that displays a first image that is superimposed on the actual scene and is visible to the viewer; a second display device that displays a second image visible to the viewer in a second display area; and when a predetermined condition is met, the color of the second image is changed to a control color that brings the color of the second image closer to the color of the first image. A display control unit.

In the display system of the present disclosure, visibility between multiple display devices can be improved.

FIG. 1 is a diagram showing an example of the system configuration of a display system according to the present embodiment. The figure which shows an example of the display by two display devices. An xy chromaticity diagram of CIE1931 color space, which is an example of a color system. 5 is a flowchart illustrating hue control processing executed by the main control unit. An explanatory diagram showing a display example when the upper HUD image and the lower HUD image are images of the same format. FIG. 6 is an explanatory diagram showing a display example when the upper HUD image and the lower HUD image are closer in distance than the display example in FIG. 5; 6 is an explanatory diagram showing a display example when the distance between the upper HUD image and the lower HUD image is longer than that in the display example of FIG. 5. FIG. 6 is an explanatory diagram showing a display example when the number of elements forming the lower HUD image is larger than that in the display example of FIG. 5. FIG. FIG. 6 is an explanatory diagram showing a display example when an upper HUD image and a lower HUD image transition between an upper HUD display area and a lower HUD display area.

Embodiments of the display system of the present disclosure will be described based on the accompanying drawings. The display system of the present disclosure can be applied to, for example, a display system mounted on a vehicle such as an automobile or a motorcycle, a ship, an agricultural machine, or a construction machine. In this embodiment, an example in which the display system of the present disclosure includes two head up displays (HUD) that are mounted on a vehicle and display required information based on various information acquired from the vehicle is described. I will explain using

FIG. 1 is a diagram showing an example of the system configuration of a display system 10 in this embodiment.
FIG. 2 is a diagram showing an example of display by two display devices.

In the following description, "front", "rear", "upper", "lower", "right" and "left" are defined as "Fr.", "Re.", "To." in FIGS. 1 and 2. ”, “Bo.”, “R”, and “L”.

The display system 10 is installed in the instrument panel 2 of the vehicle 1. The display system 10 includes an upper HUD 20, a lower HUD 30, and a main control unit 40.

The upper HUD 20 (first display device) is arranged in front of the steering wheel 5 and irradiates the windshield 3 with display light L1. The display light L1 is reflected by the windshield 3 toward the driver 4 (viewer), thereby providing the driver 4 with a virtual image V1 (first image, hereinafter referred to as "upper HUD image 28") in front of the vehicle 1. ) is visible. The upper HUD image 28 is displayed, for example, in the virtual upper HUD display area 8 (first display area) in FIG. 2, and is visually recognized while being superimposed on the scenery in front, which is a real scene such as a road surface.

The lower HUD 30 (second display device) is disposed further forward (in the direction away from the driver 4) than the upper HUD 20, and irradiates the light shielding portion 3a formed around the windshield 3 with display light L2. The light shielding portion 3a is a portion made of black ceramic or the like and having a light shielding color such as black. The light shielding portion 3a is formed for the purpose of preventing the adhesive that fixes the windshield 3 to the vehicle 1 from deteriorating due to sunlight, hiding the adhesive, improving design, and the like. The display light L2 is reflected toward the driver 4 by the light blocking portion 3a, thereby allowing the driver 4 to visually recognize an image (second image, hereinafter referred to as "lower HUD image 39") of the virtual image V2 in front of the vehicle 1. The lower HUD image 39 is displayed, for example, in a hypothetical lower HUD display area 9 (second display area) different from the upper HUD display area 8 in FIG. 2, and is visible in front of the light shielding part 3a. Unlike the upper HUD image 28, the lower HUD image 39 is not displayed superimposed on the actual scene, but is visually recognized as being superimposed on the light shielding part 3a.

The upper HUD 20 displays an image such that the upper HUD image 28 based on the virtual image V1 is visible at a position at a distance d1 in the vertical direction from the line of sight 4a that is assumed during normal times (during driving) of the driver 4. Further, the lower HUD 30 displays an image such that the lower HUD image 39 based on the virtual image V2 is visible at a position at a distance d2 greater than the distance d1 with respect to the line of sight 4a of the driver 4. That is, the distance the driver 4 moves to shift the line of sight 4a to the lower HUD image 39 is longer than the distance traveled to shift the line of sight 4a to the upper HUD image 28. In other words, the angle θ2 formed by the direction of the line of sight 4a and the line of sight direction for viewing the lower HUD image 39 is greater than the angle θ1 formed by the direction of the line of sight 4a and the line of sight direction for viewing the upper HUD image 28. is larger. Therefore, the driver 4 visually recognizes the lower HUD image 39 at a position farther from the line of sight 4a than the upper HUD image 28 and below the upper HUD image 28.

Further, in this embodiment, the upper HUD 20 forms the upper HUD image 28 in front of the lower HUD image 39. That is, the upper HUD image 28 is viewed at a position far from the driver 4 in the front-rear direction, and the lower HUD image 39 is viewed at a position closer to the driver 4 in the front-rear direction.

The display surfaces as the upper HUD display area 8 and the lower HUD display area 9 are surfaces having four sides: top, bottom, left and right. For example, the lower sides 8a, 9a and the upper sides 8b, 9b are sides substantially parallel to the left-right direction. The left sides 8c and 9c and the right sides 8d and 9d are surfaces set at arbitrary angles with respect to the vertical direction. For example, the display surface has left sides 8c, 9c and right sides 8d, 9d, which are either a surface along the vertical direction (a surface perpendicular to the road surface), or an inclined surface inclined at a predetermined angle with respect to the vertical direction (a surface inclined with respect to the road surface). , or a surface along the front-rear direction (a surface superimposed (substantially parallel) to the road surface). Further, the display surface may be a surface in which the left sides 8c, 9c and the right sides 8d, 9d are formed in a curve such that the side closer to the driver 4 follows the up-down direction, and as it gets farther away, it follows the front-rear direction. good. The display surface formed of a surface other than perpendicular to the road surface has a display distance between the driver 4 and the virtual image that differs depending on the display position on the display surface, and can display an image expressing a sense of depth. For example, if the display surface is such that the left sides 8c, 9c and the right sides 8d, 9d are inclined such that the upper sides 8b, 9b are located forward with respect to the lower sides 8a, 9a, the driver 4 may can be recognized.

Note that information regarding the line of sight 4a (view point) of the driver 4 for calculating the display distance of the image, etc. may be set in advance and held by the main control unit 40 or the like, or may be obtained from the line of sight sensor 51 (described later). You may.

The upper HUD 20 includes a display 21 , a concave mirror 22 , a housing 24 , and an upper HUD display control section 25 .

The display device 21 emits display light L1 toward the concave mirror 22. The display 21 is, for example, a TFT (Thin Film Transistor) type liquid crystal display or an organic EL (Electroluminescence) display. Note that the display device 21 may include a projector and a screen that constitutes a display surface.

The concave mirror 22 reflects the display light L1 emitted by the display 21 toward the windshield 3. The concave mirror 22 has a function as a magnifying glass, and magnifies the image displayed on the display 21 and reflects it toward the windshield 3 side. That is, the driver 4 visually recognizes an enlarged image of the image displayed on the display 21.

The casing 24 supports a control board on which the concave mirror 22, the display 21, and the upper HUD display control section 25 are mounted.

The upper HUD display control section 25 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and executes predetermined arithmetic processing according to a program written in the ROM. Specifically, the upper HUD display control section 25 controls the display 21 to display a desired image based on instructions from the main control section 40.

The lower HUD 30 includes a display 31, a housing 34, and a lower HUD display control section 35.

The display 31 directly emits the display light L2 to the light shielding section 3a outside the housing 34. The display 31 has, for example, the same configuration as the upper HUD 20. Thereby, the driver 4 visually recognizes the image displayed on the display 31 and reflected by the light shielding part 3a.

The housing 34 supports a control board on which the display 31 and the lower HUD display control section 35 are mounted.

The lower HUD display control unit 35 includes a CPU, ROM, RAM, etc., and executes predetermined arithmetic processing according to a program written in the ROM. Specifically, the lower HUD display control section 35 controls the display 31 to display a desired image based on instructions from the main control section 40.

The main control unit 40 (display control unit) controls the upper HUD 20 and the lower HUD 30 based on information acquired from various parts of the vehicle 1, which will be described later. The main control unit 40 includes a CPU, ROM, RAM, etc., and executes predetermined arithmetic processing and hue control processing, which will be described later, according to a program written in the ROM.

In addition to the display system 10 , the vehicle 1 includes a line-of-sight sensor 51 , a peripheral information acquisition section 52 , an external information acquisition section 53 , a car navigation system 54 , and a vehicle ECU (Electronic Control Unit) 55 . Each section and the main control section 40 are connected via, for example, a CAN (Controller Area Network) bus 50. The main control unit 40 displays information ( image).

The line-of-sight sensor 51 includes a camera that photographs the driver 4, an image processing device, and the like, and detects the line-of-sight 4a (direction of gaze) of the driver 4. Note that the line-of-sight sensor 51 may be provided not on the vehicle 1 side but on the display system 10 side, such as being disposed within the housing 24 of the upper HUD 20, for example.

The surrounding information acquisition unit 52 obtains information about the surroundings (outside) of the vehicle 1. The surrounding information acquisition unit 52 performs communication between the vehicle 1 and a wireless network, communication between the vehicle 1 and other vehicles, communication between the vehicle 1 and pedestrians, and communication between the vehicle 1 and roadside infrastructure. For example, the peripheral information acquisition unit 52 communicates with a communication module that can directly access a WAN (Wide Area Network), an external device that can access a WAN (such as a mobile router), an access point of a public wireless LAN (Local Area Network), etc. It has a communication module, etc., and performs Internet communication. Further, the peripheral information acquisition unit 52 includes a wireless communication module that complies with a predetermined wireless communication standard. Further, the surrounding information acquisition unit 52 has a communication device that wirelessly communicates with roadside infrastructure, and for example, from a base station of a driving safety support system (DSSS) to a roadside wireless communication device installed as infrastructure. Obtain object information and traffic information through the device.

The vehicle exterior information acquisition unit 53 detects the contents and positions of objects such as people, structures, and other vehicles existing in the external environment that is the top, bottom, front, back, left, and right of the vehicle 1 (around the vehicle 1). The external information acquisition unit 53 includes, for example, a stereo camera that images the scenery around the vehicle 1, a distance measurement sensor such as LIDAR (Laser Imaging Detection And Ranging) that measures the distance from the vehicle 1 to an object, and a sensor that measures the distance from the vehicle 1 to an object. These include sonar, ultrasonic sensors, millimeter wave radar, etc. that detect located objects.

The car navigation system 54 includes a GPS controller that calculates the position of the vehicle 1 based on a GPS (Global Positioning System) signal received from an artificial satellite or the like. The car navigation system 54 has a storage unit that stores map data, reads map data near the current position from the storage unit based on position information from the GPS controller, and guides the user to the destination set by the user. Determine. The car navigation system 54 outputs information regarding the current position of the vehicle 1 and the determined guide route to the main control unit 40.

Further, the car navigation system 54 outputs information indicating the name and type of the facility in front of the vehicle 1, the distance between the facility and the vehicle 1, etc. to the main control unit 40 by referring to the map data. Map data includes road shape information (lanes, road width, number of lanes, intersections, curves, branching roads, etc.), traffic information such as road signs such as speed limits, and traffic regulation information such as road closures, alternating traffic on one side, speed restrictions, etc. Various types of information, such as information about each lane when there are multiple lanes, are associated with position data. The car navigation system 54 outputs these various pieces of information to the main control unit 40. Note that the car navigation system 54 is not limited to one installed in the vehicle 1, but may be a mobile terminal (for example, a smartphone, a tablet PC (Personal It may be realized by a computer).

The vehicle ECU 55 acquires vehicle information necessary for running the vehicle 1, such as vehicle speed and engine rotation speed, from various sensors provided in the vehicle 1, and controls the operation of the vehicle 1. The vehicle ECU 55 outputs necessary vehicle information such as vehicle speed and warning information for the vehicle 1 itself (for example, low fuel, engine oil pressure abnormality) to the main control unit 40.

Next, the hue control processing executed by the display system 10 will be described in detail. The display system 10 in this embodiment displays information by linking the upper HUD 20 and the lower HUD 30. For example, when it is desired to particularly emphasize a warning to the driver 4, images of the same format are displayed in the upper HUD display area 8 and the lower HUD display area 9. Note that images of the same form refer to images that are expressed in the same color (hue) and have the same shape (including similar shapes).

Here, the upper HUD 20 allows the driver 4 to see the display light L1 by emitting the display light L1 from the display 21, passing through the concave mirror 22 which is a relay optical system, and reflecting it at the windshield 3. Further, the lower HUD 30 allows the driver 4 to visually recognize the display light L2 by emitting the display light L2 from the display 31 and reflecting it at the light shielding part 3a. That is, the lower HUD 30 directly emits the display light L2 to the light shielding part 3a, which is a projection member. Because of these differences, the upper HUD image 28 reproduces the virtual image V1 according to the hue of the display light L1 output from the display device 21 than the lower HUD image 39, making it difficult for the driver 4 to visually recognize it. be. Further, the upper HUD image 28 is displayed superimposed on the actual scene, and the lower HUD image 39 is displayed superimposed on the black light shielding part 3a. For this reason, the upper HUD image 28 is more susceptible to the influence of the actual scene than the lower HUD image 39, and has a lower contrast. That is, the upper HUD 20 has lower color rendering properties than the lower HUD 30.

From this, when the main control unit 40 displays the upper HUD image 28 and the lower HUD image 39 as images of the same form, the contrast of the upper HUD image 28 is lower than that of the lower HUD image 39, and the hue is Due to the lack of color, a difference in hue occurs between the two images. Here, FIG. 3 is an explanatory diagram showing the color gamuts C1 and C2 of the upper HUD 20 and the lower HUD 30 in the xy chromaticity diagram of the CIE1931 color space, which is an example of a predetermined color system.

For example, the upper HUD 20 displays the upper HUD image 28 in the color gamut C1. Further, the lower HUD 30 displays the lower HUD image 39 in the color gamut C2. The upper HUD 20 has a color gamut C1 that is narrower than the color gamut C2 of the lower HUD 30 because the color rendering properties of the upper HUD 20 are low. In this case, even if the upper HUD 20 and the lower HUD 30 generate and display images of the same shape with the color specified by the coordinate a2, the upper HUD image 28 will be displayed in the color specified by the coordinate a1. . Therefore, the upper HUD image 28 and the lower HUD image 39, which are displayed as images of the same format, may be recognized by the driver 4 as images for transmitting different information, and there is a risk that the information will not be transmitted accurately. be.

Therefore, the display system 10 in this embodiment solves the above problem by performing hue control processing when the upper HUD image 28 and the lower HUD image 39 include images of the same form (predetermined condition). This will be explained in detail below.

FIG. 4 is a flowchart illustrating hue control processing executed by the main control unit 40. The hue control process is a process that is repeatedly executed while the display system 10 is activated.

In step S1, the main control unit 40 determines whether the upper HUD image 28 and the lower HUD image 39 displayed on the upper HUD 20 and lower HUD 30 are images of the same format. Here, FIG. 5 is an explanatory diagram showing a display example when the upper HUD image 28 and the lower HUD image 39 are images of the same format. As shown in FIG. 5, in order to notify the driver 4 of a warning, the main control unit 40 uses, for example, an image showing a warning mark (warning) as an upper HUD image 28 and a lower HUD image 39. to be displayed. The main control unit 40 displays a warning mark in a red warning color, for example.

When the main control unit 40 determines that the upper HUD image 28 and the lower HUD image 39 are images of the same form (YES in step S1), in step S2, the upper HUD image 28 has the color of the lower HUD image 39. The control color is determined based on the amount of control to the color (the amount of movement from the coordinate a2). The main control unit 40 stores control amounts corresponding to various display modes in advance, for example, and determines the control amount by referring to the control amount corresponding to the current display mode.

That is, when the main control unit 40 attempts to display the upper HUD image 28 and the lower HUD image 39 in the display color specified by the coordinate a2, the upper HUD image 28 is specified by the coordinate a1 in the xy chromaticity diagram of FIG. The lower HUD image 39 is displayed in the color defined by the coordinate a2. In this case, the main control unit 40 changes the color of the lower HUD image 39 to the color gamut C1 of the upper HUD image 28 by changing the display color of the lower HUD image 39 to a control color that brings it closer to the display color of the upper HUD image 28. get closer to Specifically, the main control unit 40 sets the display color of the lower HUD image 39 to a color defined by a coordinate (for example, coordinate a1) located in a direction approaching white defined by coordinate W as the control color. Note that when the color of the lower HUD image 39 is controlled in a direction closer to white (increasing the brightness), it becomes more difficult to identify the hue difference than when it is controlled in other directions. For this reason, it is preferable that the control color be set to a color that approaches white.

Here, FIG. 6 is an explanatory diagram showing a display example when the distance between the upper HUD image 28 and the lower HUD image 39 is shorter than in the display example of FIG. 5. FIG. 7 is an explanatory diagram showing a display example when the distance between the upper HUD image 28 and the lower HUD image 39 is longer than that in the display example of FIG.

For example, the closer the upper HUD image 28 and the lower HUD image 39 are, the easier it is for these images to be directly compared because they enter the field of view at the same time, and the more likely the hue difference will be noticeable. Therefore, the main control unit 40 increases the control amount. In addition, the greater the distance, the more difficult it is to be in the field of view at the same time and the more difficult it is to compare directly, so the main control unit 40 reduces the control amount.

Specifically, the distance between the upper HUD image 28 and the lower HUD image 39 is closer in the display example of FIG. 6 than in the display example of FIG. 5. Therefore, the main control unit 40 determines the control color by increasing the control amount in the display example of FIG. 6 compared to the display example of FIG. 5. That is, the main control unit 40 determines the control color of the lower HUD image 39 in FIG. 5 to be a color closer to the original display color than the control color of the lower HUD image 39 in FIG. Further, in the display example of FIG. 7, the distance between the upper HUD image 28 and the lower HUD image 39 is longer than that of the display example of FIG. 5. Therefore, the main control unit 40 determines the control color by reducing the control amount in the display example of FIG. 7 compared to the display example of FIG. 5. That is, the main control unit 40 determines the control color of the lower HUD image 39 in FIG. 7 to be a color closer to the original display color than the control color of the lower HUD image 39 in FIG.

In addition, when determining the control amount of the color of the upper HUD image 28 and the color of the lower HUD image 39 according to the distance, the main control unit 40 controls the upper HUD image 28 and the lower HUD image 28 in a two-dimensional plane along the vertical and horizontal directions. The distance may be determined using the distance in the HUD image 39, or may be determined using the distance in a three-dimensional space including the front and rear directions. Further, the main control unit 40 may determine the control amount based on information regarding the driver's 4 line of sight 4a obtained from the line of sight sensor 51, using a deviation angle from the direction of the line of sight 4a.

The main control unit 40 controls the number of elements constituting the upper HUD image 28 or the lower HUD image 39, the number of colors of the upper HUD image 28 or the lower HUD image 39, or the light emitting area of the upper HUD image 28 or the lower HUD image 39. Accordingly, the amount of control of the color of the lower HUD image 39 to the color of the upper HUD image 28 may be determined.

FIG. 8 is an explanatory diagram showing a display example when the number of elements forming the lower HUD image 39 is greater than that in the display example of FIG. When there is an image 39b forming the lower HUD image 39 in addition to the image 39a having the same form as the upper HUD image 28, the driver 4 is less likely to perceive a hue difference as there are more elements. Therefore, the main control unit 40 decreases the control amount as the number of elements increases, and increases the control amount as the number of elements decreases. Specifically, in the display example of FIG. 8, compared to the display example of FIG. The control color is determined by making the control amount smaller in the display example in FIG. 7 than in the display example in FIG.

The main control unit 40 controls the upper HUD image 28 and the lower HUD image 39 (or other images) that have the same format, as the hue difference is alleviated as the number of colors included in the upper HUD image 28 and the lower HUD image 39 (or other images) increases. Since it is difficult to perceive the hue difference, the control amount may be made smaller than when the amount is small. Further, the main control unit 40 controls the upper HUD image 28 and the lower HUD image 39 as the light emitting area of the upper HUD image 28 and the lower HUD image 39 having the same form and the light emitting area of other images within a predetermined range from these images are larger. Since the hue difference of 39 is difficult to perceive, the control amount may be made smaller than when it is small.

Note that if the main control unit 40 considers that the hue difference has little effect on the driver 4 based on the factors determining the control amount, the main control unit 40 may display the lower HUD image 39 in the original display color. .

In step S3, the main control unit 40 controls the color of the lower HUD image 39 according to the determined control amount. As a result, the hue difference between the upper HUD image 28 and the lower HUD image 39 of the same form is alleviated, and the discomfort caused to the driver 4 due to the hue difference can be suppressed.

If the main control unit 40 determines that the upper HUD image 28 and the lower HUD image 39 are not images of the same format (NO in step S1), and after step S3, the process returns to step S1 and repeats the subsequent processes.

Note that, when the upper HUD image 28 and the lower HUD image 39, which were images of the same form, no longer include images of the same form (when the predetermined condition is no longer satisfied, NO in step S1), Or in the opposite case (if the predetermined condition is met, YES in step S1), the lower HUD image 39 is changed between the original display color of the lower HUD image 39 and the control color. In this case, the main control unit 40 may change the color continuously or discontinuously.

For example, when the main control unit 40 (line-of-sight information acquisition unit) determines that the line-of-sight 4a of the viewer is within the lower HUD display area 9 based on information regarding the viewer's line-of-sight 4a acquired from the line-of-sight sensor 51, the lower HUD image The 39 colors may be continuously (gradually) changed to the control color. Further, the main control unit 40 determines that when the line of sight 4a is outside the lower HUD display area 9, and when the line of sight 4a is located in the lower HUD display area 9, a continuous change in hue is being performed. However, since there is a risk of giving a sense of discomfort, the color of the lower HUD image 39 may be discontinuously (instantly) changed to the control color.

The display system 10 in this embodiment controls the hue of the lower HUD image 39 to change the color of the upper HUD image 28 even when a hue difference occurs between the upper HUD image 28 and the lower HUD image 39. By arranging the color close to , it is possible to alleviate the hue difference and reduce the feeling of discomfort to the driver 4. In particular, when the upper HUD image 28 and the lower HUD image 39 are images of the same type, the display system 10 can reduce the hue difference between the upper HUD image 28 and the lower HUD image 39, and improve visibility.

Furthermore, by reducing the hue difference, the display system 10 can prevent the driver 4 from perceiving the upper HUD image 28 and the lower HUD image 39, which are images of the same format, as different information.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

For example, in the display system 10, the predetermined condition is that the upper HUD image 28 and the lower HUD image 39 include images of the same format, but the predetermined condition is not limited to this. The predetermined condition is that after the upper HUD image 28 displayed in the upper HUD display area 8 is hidden, the lower HUD image 39, which is an image having the same form as the upper HUD image 28, is displayed in the lower HUD display area 9. It may be. Further, the predetermined condition is that after the lower HUD image 39 displayed in the lower HUD display area 9 is hidden, the upper HUD image 28, which is an image having the same form as the lower HUD image 39, is displayed in the upper HUD display area 8. It may be something that is done.

For example, as shown in FIG. 9, after the upper HUD image 28 moves in the direction of the lower HUD display area 9 within the upper HUD display area 8, it is hidden, and then the upper HUD image 28 is displayed under the same shape as the hidden upper HUD image 28. The predetermined condition may be that the HUD image 39 is displayed in the lower HUD display area 9 with an effect that looks as if it has transitioned from the upper HUD display area 8. In this case, after the lower HUD image 39 is displayed in the lower HUD display area 9 for a certain period of time, the lower HUD image 39 may be returned to its original display color.

Moreover, other conditions may be used as the predetermined condition, such as that even if the upper HUD image 28 and the lower HUD image 39 have different formats, the images have similar hues.

In addition, although an example has been described in which both the first display device and the second display device are HUDs, the second display device is a display device such as a TFT (Thin Film Transistor) type liquid crystal display or an organic EL (Electroluminescence) display device. The real image displayed on the panel may be visually recognized. Moreover, although the example in which the projection member of the upper HUD 20 is the windshield 3 has been described, it may be replaced with a combiner.

In the display system 10, the xy chromaticity diagram of the CIE1931 color space is used as an example of a color system, but other color systems may be applied.

1 Vehicle 2 Instrument panel 3 Windshield 3a Light shielding part 4 Driver (viewer)
4a Line of sight 5 Steering wheel 8 Upper HUD display area (first display area)
8a Lower side 8b Upper side 8c Left side 8d Right side 9 Lower HUD display area (second display area)
9a Lower side 9b Upper side 9c Left side 9d Right side 10 Display system 20 Upper HUD (first display device)
21 Display 22 Concave mirror 24 Housing 25 Upper HUD display control section 28 Upper HUD image (first image)
30 Lower HUD (second display device)
31 Display 34 Housing 35 Lower HUD display control unit 39 Lower HUD image (second image)
40 Main control section (display control section)
50 CAN bus 51 Line of sight sensor 52 Surrounding information acquisition unit 53 External information acquisition unit 54 Car navigation system 55 Vehicle ECU
a1, a2 Coordinates C1, C2 Color gamut L1 Display light L2 Display light V1, V2 Virtual image d1, d2 Distance θ1, θ2 Angle

Claims (7)

a first display device that displays in a first display area a first image that is superimposed on the actual scene and is visible to a viewer;
a second display device that displays a second image visible to the viewer in a second display area without superimposing it on the actual scene;
A display system comprising: a display control unit that changes the color of the second image to a control color that brings the color of the second image closer to the color of the first image when a predetermined condition is satisfied. The first display device has a narrower color gamut than the color gamut of the second display device in a predetermined color system,
2. The display system according to claim 1, wherein the display control unit sets, as the control color, a color defined by coordinates located in a direction in which the color of the second image approaches white. The display system according to claim 1, wherein the predetermined condition is that the first image and the second image include images of the same format. The predetermined condition is that after the first image displayed in the first display area is hidden, the second image, which is an image having the same form as the first image, is displayed in the second display area. or after the second image displayed in the second display area is hidden, the first image, which is an image having the same form as the second image, is displayed in the first display area. The display system according to claim 1. The display system according to claim 1, wherein the display control unit increases the control amount of the color of the second image to the color of the first image as the distance between the first image and the second image becomes closer. The display control unit may control the number of elements constituting the first image or the second image, the number of colors of the first image or the second image, or the light emission of the first image or the second image. The display system according to claim 1, wherein the control amount of the color of the second image is determined according to the area. further comprising a line of sight information acquisition unit that acquires information regarding the line of sight of the viewer,
When changing between the color of the second image and the control color, the display control unit changes the color of the second image and the control color when the viewer's line of sight is within the second display area. 2. The display system according to claim 1, wherein the color of the second image and the control color are changed discontinuously when the viewer's line of sight is outside the second display area.

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