In-vehicle display device, in-vehicle display method, program product, and program storage medium

Abstract

The invention provides an in-vehicle display device, an in-vehicle display method, a program product, and a program storage medium. A vehicle-mounted display device (3) for displaying, on a vehicle-mounted display terminal (50) mounted on a vehicle (2), either a vehicle-mounted image of vehicle-mounted devices (10), (10a), (10b), (10c) mounted on the vehicle (2) or a terminal image of a portable terminal (5) held by a passenger taking the vehicle (2), the vehicle-mounted display device (3) being provided with: a first image acquisition unit (11) for acquiring the terminal image from the portable terminal (5); a second image acquisition unit (21) that acquires an in-vehicle image from the in-vehicle devices (10, 10a, 10b, 10c); a malfunction detection unit (42) that detects a drawing malfunction during the generation of the terminal image; and a display control unit (31) that switches from the terminal image to the in-vehicle image and causes the in-vehicle display terminal (50) to display the in-vehicle image when the defect detection unit (42) detects a drawing defect during the generation of the terminal image.

Description

Technical Field

[0001] This disclosure relates to a vehicle-mounted display device, a vehicle-mounted display method, a program product, and a program storage medium. Background Technology

[0002] In recent years, next-generation applications for displaying information from portable terminals to in-vehicle displays have become increasingly popular. In these applications, after all the necessary information is collected from the vehicle via in-vehicle equipment to the portable terminal, the entire screen is drawn on the portable terminal, the drawn image is encoded, and then a motion picture stream is transmitted to the in-vehicle display for display.

[0003] For example, Patent Document 1 discloses a vehicle display device that, during periods when communication between the information acquisition unit and a portable terminal is invalid, selects information based on pre-set selection criteria and displays the selected information on the display unit. According to this vehicle display device, useful information can be displayed on the display unit even when communication with the portable terminal is impossible.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-1882 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] However, while the vehicle display device in Patent Document 1 determines the validity of communication between the information acquisition unit and the portable terminal, it cannot cover fault modes such as poor contact of the communication line in wired communication. Furthermore, in the vehicle display device of Patent Document 1, if communication with the portable terminal is interrupted, the display unit can display information selected based on preset selection conditions. However, depending on the selection conditions, the time required from the interruption of communication to the display unit displaying the selected information can sometimes be prolonged. If the state of communication interruption of the portable terminal continues, the period during which the information displayed on the vehicle display terminal is not updated becomes longer, potentially threatening the safety of passengers depending on the content. Therefore, the following problem exists: when a malfunction occurs in the display of information provided to the passenger from the portable terminal via the vehicle display terminal, the information cannot be displayed appropriately.

[0009] Therefore, the object of this disclosure is to provide a vehicle-mounted display device or the like that can properly display information even when a malfunction occurs in the display of information provided to a passenger from a portable terminal via a vehicle display terminal.

[0010] Solution for solving the problem

[0011] One aspect of this disclosure relates to an in-vehicle display device, which enables an in-vehicle display terminal mounted in a vehicle to display either an in-vehicle image from an in-vehicle device mounted in the vehicle or a terminal image from a portable terminal held by a passenger in the vehicle. The in-vehicle display device comprises: a first image acquisition unit that acquires the terminal image from the portable terminal; a second image acquisition unit that acquires the in-vehicle image from the in-vehicle device; a defect detection unit that detects rendering defects during the generation process of the terminal image; and a display control unit that, when the defect detection unit detects rendering defects during the generation process of the terminal image, switches from the terminal image to the in-vehicle image and causes the in-vehicle display terminal to display the in-vehicle image.

[0012] Additionally, one aspect of this disclosure relates to an in-vehicle display method, which involves an in-vehicle display terminal mounted in a vehicle displaying either an in-vehicle image from an in-vehicle device mounted in the vehicle or a terminal image from a portable terminal held by a passenger in the vehicle. The in-vehicle display method includes: a first image acquisition unit acquiring the terminal image from the portable terminal; a second image acquisition unit acquiring the in-vehicle image from the in-vehicle device; a defect detection unit detecting rendering defects during the generation process of the terminal image; and when the defect detection unit detects rendering defects during the generation process of the terminal image, switching from the terminal image to the in-vehicle image, and a display control unit causing the in-vehicle display terminal to display the in-vehicle image.

[0013] In addition, one aspect of this disclosure relates to a program product for use in executing a vehicle-mounted display method by a computer.

[0014] In addition, one aspect of this disclosure involves a program storage medium that is a computer-readable, non-transitory program storage medium storing a program for executing a vehicle-mounted display method by a computer.

[0015] The effects of the invention

[0016] According to one aspect of this disclosure, the vehicle-mounted display device, etc., can properly display information even if a malfunction occurs in the display of information provided to a passenger from a portable terminal via a vehicle-mounted display terminal. Attached Figure Description

[0017] Figure 1A This is a schematic diagram illustrating a display control system involved in an embodiment mounted in a vehicle.

[0018] Figure 1B This is a block diagram illustrating the display control system according to the embodiment.

[0019] Figure 2 It is a diagram showing the undesirable conditions.

[0020] Figure 3 This is another block diagram illustrating the display control system involved in the implementation.

[0021] Figure 4 This is a diagram showing the image displayed on the vehicle-mounted display terminal.

[0022] Figure 5 This is another block diagram illustrating the display control system involved in the embodiment.

[0023] Figure 6 This is a sequence diagram showing the operation example 1 of the display control system.

[0024] Figure 7 This is a sequence diagram showing the operation example 2 of the display control system.

[0025] Figure 8 This is a sequence diagram showing the operation example 3 of the display control system.

[0026] Figure 9 This is yet another block diagram illustrating the display control system involved in other variations. Detailed Implementation

[0027] The embodiments will now be described in detail with reference to the accompanying drawings.

[0028] Furthermore, the embodiments described below are general or specific examples. The numerical values, shapes, materials, structural elements, the arrangement and connection methods of structural elements, steps, and the order of steps shown in the following embodiments are examples and are not intended to limit this disclosure. Additionally, structural elements in the following embodiments not described in the independent claims are described as arbitrary structural elements.

[0029] Furthermore, the figures are schematic diagrams and may not be strictly representational. Also, the same reference numerals are used to label the same structural components in all figures.

[0030] (Implementation Method)

[0031] <Structure and Function>

[0032] First, refer to Figures 1A-2 The structure and function of the display control system 1 will be explained.

[0033] Figure 1AThis is a schematic diagram showing the display control system 1 according to the embodiment mounted on vehicle 2. Figure 1B This is a block diagram illustrating the display control system 1 according to the embodiment. Figure 2 It is a diagram showing the undesirable conditions. Figure 2 (a) shows the undesirable condition when the solid color becomes white or black. Figure 2 (b) shows the adverse condition when it is not updated. Figure 2 (c) shows the undesirable situation where the drawing frame is corrupted.

[0034] like Figure 1A and Figure 1B As shown, the display control system 1 is a system capable of displaying images on one or more in-vehicle display terminals 50 mounted on the vehicle 2. The images displayed on the one or more in-vehicle display terminals 50 are in-vehicle images related to the vehicle 2, or terminal images output by a portable terminal 5. The in-vehicle images and terminal images include, for example, images from vehicle-mounted instruments, the operating status of vehicle-related devices, navigation information, camera images of the interior and exterior of the vehicle 2, and information about surrounding vehicles. The images from vehicle-mounted instruments include images of the speedometer, turn signals, warning lights, odometer, shift position, fuel gauge, and water temperature gauge. Vehicle-related devices include, for example, audio equipment, vehicle lighting devices, and seat systems. Navigation information is used to guide the user to their current location and destination while the vehicle 2 is in motion. Camera images are images obtained by a camera mounted on the vehicle 2 capturing images of the area around the vehicle 2 or inside the vehicle. Surrounding vehicle information indicates the presence, number, speed, and distance of other vehicles around the vehicle 2 from the vehicle 2.

[0035] like Figure 1B As shown, the display control system 1 includes an in-vehicle display device 3 and an in-vehicle display terminal 50.

[0036] The in-vehicle display device 3 enables the in-vehicle display terminal 50 mounted on the vehicle 2 to display either the in-vehicle image of the in-vehicle device 10 mounted on the vehicle 2 or the terminal image of the portable terminal 5 held by a passenger of the vehicle 2. For example, when the in-vehicle display device 3 and the portable terminal 5 are connected in a communicative manner, the in-vehicle display device 3 can enable the in-vehicle display terminal 50 to display the terminal image of the portable terminal 5. Furthermore, when the in-vehicle display device 3 is not connected in a communicative manner to the portable terminal 5, the in-vehicle display device 3 can enable the in-vehicle display terminal 50 to display the in-vehicle image. In this embodiment, unless otherwise specified, the case where the in-vehicle display device 3 and the portable terminal 5 are connected in a communicative manner is assumed.

[0037] Here, portable terminal 5 is a terminal held by the passenger of vehicle 2, such as a smartphone, tablet, etc.

[0038] The vehicle-mounted display device 3 includes vehicle-mounted equipment 10 and monitoring equipment 40.

[0039] The vehicle-mounted device 10 performs processing to acquire vehicle-mounted images or terminal images and to display any of the acquired images on the vehicle-mounted display terminal 50.

[0040] Specifically, the vehicle-mounted device 10 includes a first image acquisition unit 11, a terminal memory 12, a second image acquisition unit 21, a vehicle-mounted memory 22, a display control unit 31, and a display memory 32.

[0041] The first image acquisition unit 11 is connected to the portable terminal 5 in a communicable manner to acquire terminal images from the portable terminal 5. The first image acquisition unit 11 outputs the terminal images acquired from the portable terminal 5 to the terminal memory 12 in a form that can be displayed on the vehicle display terminal 50.

[0042] The terminal memory 12 is a storage medium that holds a storage area such as a frame memory (also called a buffer or surface) for temporarily storing terminal images acquired from the portable terminal 5. The terminal memory 12 holds the acquired terminal images. In addition, the terminal images acquired from the first image acquisition unit 11 can also be pre-drawn by the portable terminal 5 in a form that can be displayed on the vehicle display terminal 50, and are not limited to this embodiment.

[0043] Here, the monitoring device 40 has a third image acquisition unit 41 and a defect detection unit 42.

[0044] The third image acquisition unit 41 is an input interface for acquiring terminal images stored in the terminal memory 12. The third image acquisition unit 41 outputs the terminal images acquired from the terminal memory 12 to the defect detection unit 42.

[0045] The defect detection unit 42 detects defects in the rendering process during the generation of the terminal image. Defects in rendering refer to abnormalities or malfunctions in the rendering process during the generation of the terminal image.

[0046] For example, the defect detection unit 42 determines whether a defect has occurred in each drawn frame (sometimes called a drawing frame) during the generation of the terminal image.

[0047] Poor drawing conditions, such as Figure 2As shown in (a) to (c), there are cases where the drawing frame is a plain white or black, cases where more than a certain number of drawing frames have not changed (not updated), cases where the color or pattern is random, and cases where the drawing frame is damaged. In the cases where the drawing frame is a plain white or black, or in the cases where the drawing frame is damaged, since the drawing frame is white or black or has a random color or pattern, the defect detection unit 42 can easily make a determination. In the cases where the drawing frame has not changed, the defect detection unit 42 can determine whether the time during which no drawing frame update has occurred is more than a certain period by checking the difference between the reference drawing frame and the drawing frames before the reference drawing frame.

[0048] like Figure 1B As shown, when the defect detection unit 42 determines that a defect has occurred during drawing and detects the defect, it outputs information indicating the occurrence of the defect to the display control unit 31. On the other hand, when the defect detection unit 42 does not detect a defect, it determines that no defect has occurred during drawing and outputs information indicating that the drawing is normal to the display control unit 31.

[0049] Returning to the description of the vehicle-mounted device 10, the second image acquisition unit 21 of the vehicle-mounted device 10 can be, for example, an input interface for acquiring vehicle images from an on-board storage unit (not shown) mounted on the vehicle-mounted device 10, or an image generation unit for acquiring vehicle images by generating vehicle images through a specified application. The second image acquisition unit 21 outputs the acquired vehicle images to the on-board storage unit 22.

[0050] The vehicle-mounted memory 22 is a storage medium that holds storage areas such as a frame memory (also called a buffer or surface), which is used to temporarily store vehicle-mounted images acquired from the second image acquisition unit 21. The vehicle-mounted memory 22 holds the acquired vehicle-mounted images.

[0051] The display control unit 31 acquires a terminal image from the terminal memory 12 or an in-vehicle image from the in-vehicle memory 22. The display control unit 31 outputs any one of the acquired images to the display memory 32.

[0052] The display control unit 31 outputs the drawn terminal image or the drawn vehicle image to the display memory 32, and the drawn terminal image or the drawn vehicle image is displayed on the vehicle display terminal 50 via the display memory 32, so that the vehicle display terminal 50 displays the drawn terminal image or the drawn vehicle image.

[0053] Furthermore, the display control unit 31 can switch between a drawn terminal image and a drawn vehicle image based on instructions from the portable terminal 5. That is, by having a passenger holding the portable terminal 5 operate the portable terminal 5, the display control unit 31 switches the image displayed on the vehicle display terminal 50 to a drawn terminal image or a drawn vehicle image according to instructions corresponding to the operation.

[0054] When the defect detection unit 42 detects a drawing defect during the generation of the terminal image, the display control unit 31 switches from the drawn terminal image to the drawn vehicle image and causes the vehicle display terminal 50 to display the drawn vehicle image. Specifically, since the portable terminal 5 and the vehicle display device 3 are connected in a communicable manner, the vehicle display device 3 outputs the drawn terminal image to the vehicle display terminal 50. However, when the display control unit 31 receives information from the defect detection unit 42 indicating a drawing defect, it switches from the drawn terminal image to the drawn vehicle image and displays the vehicle image on the vehicle display terminal 50 via the display memory 32. Conversely, when the display control unit 31 receives information from the defect detection unit 42 indicating normal drawing, it causes the vehicle display terminal 50 to continue displaying the drawn terminal image.

[0055] Display memory 32 is a storage medium that holds storage areas such as frame memory (also called buffer or surface), which is used to temporarily store terminal images or vehicle images acquired from display control unit 31. Display memory 32 outputs the temporarily stored terminal images or vehicle images to vehicle display terminal 50.

[0056] In addition, although not shown, display memory 32 may also include a frame memory for holding data for overlapping images.

[0057] The vehicle display terminal 50 is a vehicle-mounted display that is installed in the vehicle 2 and displays terminal images or vehicle images output from the display memory 32.

[0058] In this embodiment, such as Figure 3 and Figure 4 As shown, the vehicle-mounted display device 3 may also have the following structure and functions. (Refer to...) Figure 3 and Figure 4 The in-vehicle display device 3 will now be explained.

[0059] Figure 3 This is another block diagram illustrating the display control system 1 according to the embodiment. Figure 4 This is a diagram showing the image displayed on the vehicle-mounted display terminal 50. Figure 4 (a) shows the terminal image. Figure 4(b) shows the second in-vehicle image. Figure 4 (c) shows the first in-vehicle image.

[0060] Specifically, such as Figure 3 As shown, the second image acquisition unit 21 of the vehicle-mounted display device 3 has an application unit 23.

[0061] Application unit 23 has a first application and a second application. Application unit 23 can be used to launch the first application for displaying a first in-vehicle image and the second application for displaying a second in-vehicle image with less information than the first in-vehicle image. The first in-vehicle image and the second in-vehicle image are included in the in-vehicle image.

[0062] If the portable terminal 5 is not connected to the vehicle display device 3 in a communicative manner, the application unit 23 starts the first application. Thereby, the display control unit 31 outputs the first vehicle image stored in the vehicle memory 22 to the vehicle display terminal 50, and the vehicle display terminal 50 displays the first vehicle image.

[0063] On the other hand, when the portable terminal 5 and the vehicle display device 3 are connected in a communicative manner, as described above, the display control unit 31 may switch the display from the drawn first vehicle image to the drawn terminal image, and the vehicle display terminal 50 may display the drawn terminal image. Afterwards, the application unit 23 may stop the first application and start the second application. The application unit 23 starts the second application and outputs the second vehicle image to the display control unit 31 via the vehicle memory 22. At this time, the display control unit 31 does not output the second vehicle image stored in the vehicle memory 22 to the vehicle display terminal 50, and the second application is started in the background of the vehicle display device 3. Alternatively, after the second application is started, the display control unit 31 may switch the display from the drawn first vehicle image to the drawn terminal image, and then the first application may be stopped.

[0064] In this way, by switching the display from the drawn first vehicle-mounted image to the drawn terminal image by the display control unit 31, the vehicle-mounted display terminal 50 can... Figure 4 The terminal image is displayed as shown in (a).

[0065] Furthermore, if the defect detection unit 42 detects a rendering defect during the generation process of the terminal image, the display control unit 31 acquires information indicating the occurrence of the rendering defect, thereby switching the display control unit 31 from the rendered terminal image to the rendered second vehicle image, and causing the vehicle display terminal 50 to display the rendered second vehicle image. That is, as Figure 4As shown in (b), the display control unit 31 causes the vehicle display terminal 50 to display the drawn second vehicle image.

[0066] Furthermore, when the defect detection unit 42 detects a drawn defect, after the vehicle display terminal 50 displays the drawn second vehicle image, the application unit 23 launches the first application. For example, the application unit 23 can launch the first application either based on an instruction from the display control unit 31, which has received information indicating the occurrence of the drawn defect, or by receiving information indicating the occurrence of the drawn defect from the monitoring device 40. After the first application is launched, the display control unit 31 switches from the second vehicle image stored in the vehicle memory 22 to the first vehicle image stored in the vehicle memory 22. Therefore, as... Figure 4 As shown in (c), the display control unit 31 causes the vehicle display terminal 50 to display the first vehicle image drawn. That is, the second vehicle image is displayed to connect the period from when the drawn defect is detected to when the first application is started and the vehicle display terminal 50 displays the first vehicle image drawn.

[0067] like Figure 3 As shown, after the first application completes its startup, the application unit 23 stops the second application. In this way, the increase in resources (processing load, power consumption, etc.) of the vehicle-mounted device 10a can be suppressed by stopping the unnecessary second application.

[0068] In addition, in this embodiment, such as Figure 5 As shown, the vehicle-mounted display device 3 may also have the following structure and functions. (Refer to...) Figure 5 The in-vehicle display device 3 will now be explained.

[0069] Figure 5 This is another block diagram illustrating the display control system 1 according to the embodiment.

[0070] Specifically, the vehicle-mounted display device 3 includes a vehicle-mounted device 10b and multiple monitoring devices 40a, 40b. The vehicle-mounted device 10b includes multiple first image acquisition units 11a, 11b, multiple terminal memories 12a, 12b, a second image acquisition unit 21, a vehicle-mounted memory 22, a connection status management unit 33, multiple display control units 31a, 31b, and multiple display memories 32a, 32b. Furthermore, the vehicle-mounted display device 3 may also include multiple second image acquisition units 21 and multiple vehicle-mounted memories 22, and is not limited to this embodiment.

[0071] Multiple first image acquisition units 11a, 11b, multiple terminal memories 12a, 12b, multiple display control units 31a, 31b, multiple display memories 32a, 32b, and multiple monitoring devices 40a, 40b are paired one-to-one. Additionally, multiple vehicle-mounted display terminals 50a, 50b are mounted on vehicle 2, and each vehicle-mounted display terminal 50a, 50b corresponds one-to-one with a display control unit 31a, 31b. In this embodiment, as an example, two first image acquisition units 11a, 11b, two terminal memories 12a, 12b, two display control units 31a, 31b, two display memories 32a, 32b, and two monitoring devices 40a, 40b are illustrated. Of course, this embodiment also includes cases where there are three or more first image acquisition units 11, terminal memories 12, display control units 31, display memories 32, and monitoring devices 40.

[0072] The portable terminal 5 outputs terminal images to multiple first image acquisition units 11a and 11b respectively. Multiple terminal memories 12a and 12b, based on the terminal images acquired by the multiple first image acquisition units 11a and 11b, use a prescribed application program to draw the terminal images in a form that can be displayed on multiple vehicle display terminals 50a and 50b, and output the drawn terminal images to multiple display control units 31a and 31b and multiple monitoring devices 40a and 40b in a one-to-one correspondence.

[0073] Here, based on the determined results, the multiple monitoring devices 40a and 40b output information indicating the occurrence of rendering defects or information indicating normal rendering to the multiple display control units 31a and 31b in a one-to-one correspondence. In addition, the multiple monitoring devices 40a and 40b output the results obtained from determining whether defects occurred in each rendering frame during the generation process of the terminal image stored in the terminal memories 12a and 12b to the connection status management unit 33.

[0074] The connection status management unit 33 acquires the results from multiple monitoring devices 40a and 40b, and manages multiple display control units 31a and 31b based on the acquired results. The connection status management unit 33 manages the multiple monitoring devices 40a and 40b based on the results output by the malfunction detection unit 42, so that the multiple vehicle display terminals 50a and 50b display the drawn terminal image or the drawn vehicle image.

[0075] Specifically, when the number of results from the defect detection units 42 of the multiple monitoring devices 40a and 40b indicating that defects occurred during rendering exceeds a predetermined threshold, the connection status management unit 33 outputs an instruction to the multiple display control units 31a and 31b to switch from the rendered terminal image to the rendered vehicle image. The multiple display control units 31a and 31b then display the vehicle image on the multiple vehicle display terminals 50a and 50b via the multiple display memories 32a and 32b, respectively.

[0076] Furthermore, if the number of adverse events occurring during the rendering process exceeds a predetermined threshold, even if no adverse events occur during the rendering process, it is considered that the likelihood of adverse events occurring thereafter is high, and therefore all rendered terminal images are replaced with rendered vehicle images.

[0077] On the other hand, if the number of results indicating a problem occurred during rendering is less than a predetermined threshold, the connection status management unit 33 outputs an instruction to the multiple display control units 31a and 31b to disallow switching from the rendered terminal image to the rendered vehicle image. The multiple display control units 31a and 31b then cause the multiple vehicle display terminals 50a and 50b to display the rendered terminal image. Therefore, the multiple display control units 31a and 31b respectively display the terminal image on the multiple vehicle display terminals 50a and 50b via the multiple display memories 32a and 32b. The predetermined threshold is, for example, more than half, but is not limited to more than half.

[0078] Furthermore, in the terminal images stored in the designated terminal memory 12 of the multiple terminal memories 12a and 12b, sometimes the drawn frame does not change for a period longer than a predetermined period. In this case, if the connection status management unit 33 obtains that the drawn terminal image does not change for a period longer than the predetermined period and the defect detection unit 42 determines that a defect has occurred during the drawing process, and if there is no drawing defect in other results besides this result, it determines that only the drawn terminal image does not change and no drawing defect has occurred during the terminal image generation process, and causes the multiple vehicle display terminals 50a and 50b to continue displaying the drawn terminal image.

[0079] Specifically, if no adverse condition occurs in any of the terminal memories 12 other than the designated terminal memory 12, the connection status management unit 33 determines that only the drawing frame has not changed, and discards the result determined by the adverse condition detection unit 42 that an adverse condition occurred during drawing. In this case, the multiple display control units 31a and 31b continue to cause the multiple vehicle display terminals 50a and 50b to display the drawn terminal image.

[0080] However, if other terminal memories 12 besides the designated terminal memory 12 also malfunction, the connection status management unit 33 outputs an instruction to the multiple display control units 31a and 31b to switch from the drawn terminal image to the drawn vehicle image and to display the drawn vehicle image on the multiple vehicle display terminals 50a and 50b. In this case, the multiple display control units 31a and 31b switch from the drawn terminal image to the drawn vehicle image and display the drawn vehicle image on the multiple vehicle display terminals 50a and 50b.

[0081] Furthermore, the connection status management unit 33 can also notify the multiple vehicle-mounted display terminals 50a, 50b, audio devices, and other notification units installed in the vehicle 2 of the content of the resulting defect when it receives a result of a defect occurring during rendering from one or more defect detection units 42. The content of the defect includes, for example, the number of defects occurring during rendering exceeding a predetermined threshold, or the defect being caused by insufficient resources of the portable terminal 5.

[0082] In addition, in this embodiment, the vehicle-mounted display device 3 may also have the following structure and functions.

[0083] Specifically, the defect detection unit 42 also detects the communication connection status between the portable terminal 5 and the vehicle-mounted display device 3. The vehicle-mounted display terminal 50 displays the defect status of the communication connection between the portable terminal 5 and the vehicle-mounted display device 3 or the defect status of the terminal image generation process (defect status of the terminal memory 12) based on the presence or absence of defects in the drawing process during the generation of the terminal image.

[0084] More specifically, when the portable terminal 5 and the vehicle-mounted display device 3 are connected in a communicative manner, the defect detection unit 42, upon detecting a defect in the rendering process during the generation of the terminal image, outputs a detection result indicating a defect in the terminal memory 12 to the display control unit 31. The display control unit 31 then causes the vehicle-mounted display terminal 50 to display information indicating a defect in the terminal memory 12. In other words, the vehicle-mounted display terminal 50 displays a defect in the rendering process during the generation of the terminal image using a vehicle-mounted image.

[0085] On the other hand, in the case where the portable terminal 5 is not connected to the vehicle display device 3 in a communicative manner, the defect detection unit 42, upon detecting a defect in the rendering process during the generation of the terminal image, outputs a detection result indicating the defect in the communication connection to the display control unit 31. Examples of communication connection defects include situations where communication between the portable terminal 5 and the vehicle display device 3 is interrupted or intermittently cut off during wireless communication, or situations where the portable terminal 5 is connected to the vehicle display device 3 via a communication cable but is not communicatively connected. The display control unit 31 causes the vehicle display terminal 50 to display information indicating a defect in the communication connection. That is, the vehicle display terminal 50 displays the defect in the communication connection between the portable terminal 5 and the vehicle display device 3 using a vehicle-mounted image.

[0086] Furthermore, it can also be applied to situations where the defect detection unit 42 detects a defect in the communication connection between the portable terminal 5 and the vehicle-mounted display device 3, or a defect in the rendering process during the generation of the terminal image. Figure 5 As shown, the vehicle-mounted display device 3 includes multiple monitoring devices 40a and 40b, and the vehicle-mounted device 10b includes multiple first image acquisition units 11a and 11b, multiple terminal memories 12a and 12b, a second image acquisition unit 21, a vehicle-mounted memory 22, a connection status management unit 33, multiple display control units 31a and 31b, and multiple display memories 32a and 32b.

[0087] In this case, the connection status management unit 33 can obtain the results of determining whether a malfunction has occurred from multiple monitoring devices 40a and 40b, and determine whether the malfunction is in the communication connection between the portable terminal 5 and the vehicle-mounted display device 3 or in the rendering process during the generation of the terminal image based on the obtained results. For example, if the number of results indicating a malfunction during rendering is less than a predetermined threshold (around a few), the connection status management unit 33 may determine that the malfunction is in the rendering process during the generation of the terminal image. Alternatively, if the connection status management unit 33 obtains the result indicating a malfunction during rendering from all monitoring devices 40, it may determine that the malfunction is in the communication connection between the portable terminal 5 and the vehicle-mounted display device 3.

[0088] <Action Example 1>

[0089] Next, refer to Figure 6 Example 1 of the operation of the display control system 1 will be explained.

[0090] Figure 6 This is a sequence diagram illustrating example 1 of the operation of the display control system 1. Figure 6 The paper envisions a scenario where a malfunction occurs in the terminal image during display due to reasons such as communication interruption.

[0091] First, the vehicle-mounted display device 3 and the portable terminal 5 are connected in a communicable manner, thereby the first image acquisition unit 11 of the vehicle-mounted device 10 acquires a terminal image from the portable terminal 5 (S11).

[0092] Next, the terminal memory 12 acquires a terminal image from the first image acquisition unit 11, and stores the acquired terminal image in a form that enables it to be displayed on the vehicle display terminal 50. The stored terminal image is then output to the display control unit 31 and the monitoring device 40 (S12).

[0093] Next, the monitoring device 40 outputs the result of detecting the defect in the terminal memory 12 (information indicating the occurrence of the defect in the drawing) to the display control unit 31 (S13).

[0094] Next, the second image acquisition unit 21 of the vehicle-mounted device 10 acquires the rendered vehicle-mounted image (S14).

[0095] Next, the vehicle memory 22 acquires a vehicle image from the second image acquisition unit 21 and renders the acquired vehicle image in a form that can be displayed on the vehicle display terminal 50 (S15). The vehicle memory 22 outputs the stored vehicle image to the display control unit 31.

[0096] In addition, steps S14 and S15 can also be performed before steps S11 and S12.

[0097] Next, since the monitoring device 40 detects a malfunction in the drawing process, the display control unit 31 switches from the drawn terminal image to the drawn vehicle image (S16), and causes the vehicle display terminal 50 to display the drawn vehicle image. That is, the display control unit 31 outputs the drawn vehicle image to the vehicle display terminal 50 via the display memory 32.

[0098] Next, the vehicle display terminal 50 displays the drawn vehicle image (S17).

[0099] Then, the end. Figure 6 Processing of sequence diagrams.

[0100] <Action Example 2>

[0101] Next, refer to Figure 7Example 2 of the operation of the display control system 1 will be explained.

[0102] Figure 7 This is a sequence diagram illustrating example 2 of the operation of the display control system 1. Figure 7 In Action Example 2, an action example is shown where no adverse conditions occur during drawing, and the state changes from the state where the portable terminal 5 is not connected to the vehicle display device 3 in a communicable manner to the state where the portable terminal 5 is connected to the vehicle display device 3 in a communicable manner.

[0103] First, if the portable terminal 5 is not connected to the vehicle-mounted display device 3 in a communicative manner, the application unit 23 starts the first application (S21).

[0104] Next, when the portable terminal 5 and the vehicle-mounted display device 3 are connected in a communicative manner, the display control unit 31 switches the display from the drawn vehicle-mounted image to the drawn terminal image (S22), and causes the vehicle-mounted display terminal 50 to display the drawn terminal image. That is, the display control unit 31 outputs the terminal image to the vehicle-mounted display terminal 50 via the display memory 32.

[0105] Next, the vehicle-mounted display terminal 50 displays the drawn terminal image (S23).

[0106] Next, application unit 23 stops the first application and starts the second application (S24). This is because the second application has less information, so it is preferable to stop the first application, which has more information. If the second application, which has fewer resources than the first application, is started in the background, even if a problem occurs in the rendering of the terminal image, it is expected that the terminal image will be switched to the second in-vehicle image of the second application immediately, and resource consumption during the display standby period of the second application can be suppressed.

[0107] Next, the application unit 23 starts the second application, draws the second vehicle image in a form that can be displayed on the vehicle display terminal 50 via the vehicle memory 22, and outputs the drawn second vehicle image to the display control unit 31 (S25). At this time, the display control unit 31 does not output the second vehicle image held by the vehicle memory 22 due to the start of the second application to the vehicle display terminal 50.

[0108] Therefore, in the terminal memory 12, if no adverse conditions occur during the generation of the terminal image, the display control unit 31 causes the vehicle display terminal 50 to continue displaying the drawn terminal image and sets the display of the second vehicle image drawn based on the second application to a standby state.

[0109] Then, the end. Figure 7 Processing of sequence diagrams.

[0110] <Action Example 3>

[0111] Next, refer to Figure 8 Example 3 of the operation of the display control system 1 will be explained.

[0112] Figure 8 This is a sequence diagram illustrating example 3 of the operation of the display control system 1. Figure 8 In action example 3, it is shown that after performing Figure 7 The following is an example of an action that occurs in the drawing process after the action example 2 shown.

[0113] First, in case of problems during drawing, execute... Figure 6 The processing of Action Example 1 (S11~S13). If the defect detection unit 42 detects the drawn defect, such as... Figure 7 As shown in step S25, the second application has been launched, therefore the display control unit 31 switches from the drawn terminal image to the drawn second vehicle image (S31), and causes the vehicle display terminal 50 to display the drawn second vehicle image (S32). Since the second vehicle image has less information, it is considered preferable to display the first vehicle image with more information on the vehicle display terminal 50. Therefore, the second vehicle image is displayed on the vehicle display terminal 50 only during the period before the drawn first vehicle image can be displayed on the vehicle display terminal 50.

[0114] Next, in order to display the first in-vehicle image drawn on the in-vehicle display terminal 50, the application unit 23 starts the first application (S33).

[0115] Furthermore, the order of steps S31, S32, and S33 can be either reversed or performed simultaneously.

[0116] Next, after the first application has started, the display control unit 31 switches from the second vehicle image stored in the vehicle memory 22 to the first vehicle image stored in the vehicle memory 22 (S34). The display control unit 31 causes the vehicle display terminal 50 to display the drawn first vehicle image (S35). As a result, the vehicle display terminal 50 is able to display the first vehicle image with a large amount of information.

[0117] Next, application unit 23 stops the second application (S36).

[0118] Then, the end. Figure 8 Processing of sequence diagrams.

[0119] <Effects>

[0120] Next, the effects of the vehicle-mounted display device 3, the vehicle-mounted display method, and the program involved in this embodiment will be explained.

[0121] As described above, the vehicle-mounted display device 3 according to Technology 1 of this embodiment enables the vehicle-mounted display terminal 50 mounted on the vehicle 2 to display any one of the vehicle-mounted images of the vehicle-mounted devices 10, 10a, 10b, and 10c mounted on the vehicle 2 and the terminal image of the portable terminal 5 held by the passenger of the vehicle 2. The vehicle-mounted display device 3 includes: a first image acquisition unit 11 that acquires terminal images from the portable terminal 5; a second image acquisition unit 21 that acquires vehicle-mounted images from the vehicle-mounted devices 10, 10a, 10b, and 10c; a defect detection unit 42 that detects defects in the rendering process during the generation of the terminal image; and a display control unit 31 that, when the defect detection unit 42 detects defects in the rendering process during the generation of the terminal image, switches from the terminal image to the vehicle-mounted image and causes the vehicle-mounted display terminal 50 to display the vehicle-mounted image.

[0122] Accordingly, since the defect detection unit 42 detects the defects in the drawing, even if the communication between the portable terminal 5 and the external base station is cut off or some defects occur when drawing the terminal image, it is possible to switch from the terminal image to the vehicle image and make the vehicle display terminal 50 display the switched vehicle image.

[0123] Therefore, according to the vehicle display device 3, even if a malfunction occurs in the display of information provided to the passenger from the portable terminal 5 via the vehicle display terminal 50, the information can still be displayed appropriately.

[0124] Furthermore, the vehicle-mounted display device 3 involved in Technology 2 of this embodiment is the same vehicle-mounted display device 3 described in Technology 1. In this case, the vehicle-mounted image includes a first vehicle-mounted image and a second vehicle-mounted image. The vehicle-mounted display device 3 has an application unit 23, which is used to launch a first application for displaying the first vehicle-mounted image and a second application for displaying a second vehicle-mounted image with less information than the first vehicle-mounted image. When the portable terminal 5 is not connected to the vehicle-mounted display device 3 in a communicative manner, the application unit 23 launches the first application.

[0125] Accordingly, even when the portable terminal 5 is not connected to the vehicle-mounted display device 3, a high-functioning first vehicle-mounted image (with more information than the second vehicle-mounted image) can be presented to the passenger by activating the first application.

[0126] Furthermore, the vehicle-mounted display device 3 described in Technology 3 of this embodiment is the same as the vehicle-mounted display device 3 described in Technology 2. In this case, when the portable terminal 5 and the vehicle-mounted display device 3 are connected in a communicable manner, the application unit 23 stops the first application, starts the second application, and the display control unit 31 switches the display from the vehicle-mounted image to the terminal image.

[0127] Accordingly, when the portable terminal 5 and the vehicle-mounted display device 3 are connected in a communicative manner, the vehicle-mounted display terminal 50 can display a terminal image. Furthermore, it is possible to stop a first application with a large amount of information and start a second application with less information, thus putting the second application into standby mode. Therefore, compared to starting the first application and putting it into standby mode, the increase in resources in the vehicle-mounted display device 3 can be suppressed.

[0128] Furthermore, if a second application with fewer resources than the first application is launched in the background, even if a malfunction occurs during the rendering of the terminal image, the system can immediately switch from the terminal image to the second in-vehicle image of the second application. Therefore, even if a malfunction occurs during the display of information provided to the passenger from the portable terminal 5 via the vehicle display terminal 50, the information can be displayed immediately, thus enabling the system to continue presenting information to the passenger and suppressing any reduction in the safety of the moving vehicle 2.

[0129] Furthermore, the vehicle-mounted display device 3 involved in Technology 4 of this embodiment is the vehicle-mounted display device 3 described in Technology 3. In this case, after the second application is started, if the defect detection unit 42 detects a drawing defect during the generation process of the terminal image, when the display control unit 31 switches from the terminal image to the second vehicle-mounted image and displays the second vehicle-mounted image on the vehicle-mounted display terminal 50, the application unit 23 starts the first application. After the first application is started, the display control unit 31 switches from the second vehicle-mounted image to the first vehicle-mounted image, and the application unit 23 stops the second application.

[0130] Accordingly, in the event of a detected malfunction in the rendering, the system can switch from the terminal image to a second in-vehicle image from a pre-launched second application, thus enabling immediate display of information.

[0131] Furthermore, even during the brief period before the first application's startup is complete, the display control unit 31 can still cause the in-vehicle display terminal 50 to display the second in-vehicle image. Therefore, even if a malfunction occurs during rendering, the necessary information can continue to be presented to the passenger.

[0132] Furthermore, the system enables the first application to launch and switches from the second in-vehicle image to the first in-vehicle image after the first application launches, thus minimizing the display period of the second in-vehicle image, which contains less information. This allows for the appropriate display of information.

[0133] Furthermore, after switching to the first in-vehicle image, unnecessary second applications are stopped, thereby suppressing the increase in resources of in-vehicle devices 10, 10a, 10b, and 10c.

[0134] Furthermore, the vehicle-mounted display device 3 involved in Technology 5 of this embodiment is the vehicle-mounted display device 3 described in any one of Technology 2 to 4. In this case, the defect detection unit 42 also detects the communication connection status between the portable terminal 5 and the vehicle-mounted display device 3, and the vehicle-mounted display terminal 50 displays the defective communication connection status between the portable terminal 5 and the vehicle-mounted display device 3 or the defective drawing status during the generation process of the terminal image based on the presence or absence of rendering defects during the generation process of the terminal image and the communication connection status.

[0135] Therefore, it is possible to notify whether the problem is with the communication connection or with the rendering process during the generation of the terminal image, thus informing the passenger of the specific type of problem. The passenger can then take appropriate measures to resolve the problem by understanding its nature.

[0136] Furthermore, the vehicle-mounted display device 3 according to technology 6 of this embodiment is the vehicle-mounted display device 3 described in any one of technologies 1 to 5. In this case, the vehicle-mounted display device 3 has multiple malfunction detection units 42 (malfunction detection units 42 of multiple monitoring devices 40a, 40b), and the vehicle-mounted display device 3 has a connection status management unit 33. This connection status management unit 33 manages the display based on the results output by the multiple malfunction detection units 42 (malfunction detection units 42 of multiple monitoring devices 40a, 40b) so that the multiple vehicle-mounted display terminals 50a, 50b display terminal images or vehicle-mounted images.

[0137] Accordingly, the connection status management unit 33 can, for example, consider the results output by multiple monitoring devices 40a, 40b to determine whether to continue the terminal image or switch from the terminal image to the vehicle image. Therefore, the reliability of determining whether any adverse conditions have occurred during the rendering process of the terminal image generation can be improved.

[0138] Furthermore, the vehicle-mounted display device 3 involved in Technology 7 of this embodiment is the vehicle-mounted display device 3 described in Technology 6. In this case, if the connection status management unit 33 obtains that the drawn terminal image has not changed for a period of time or longer and the defect detection unit 42 (the defect detection unit 42 of the multiple monitoring devices 40a, 40b) determines that a defect has occurred during the drawing process, and if there is no drawing defect in other results besides this result, it determines that only the drawn terminal image has not changed and no drawing defect has occurred during the drawing process of the terminal image generation process, and causes the multiple vehicle-mounted display terminals 50a, 50b to continue displaying the terminal image.

[0139] Therefore, since the drawn terminal image remains unchanged for a long period, even if multiple monitoring devices 40a and 40b mistakenly determine that a malfunction occurred during the drawing process, the connection status management unit 33 can determine that no malfunction occurred during the drawing process if no malfunction is found in other results. Thus, the reliability of determining whether a malfunction occurred during the drawing process in the terminal image generation process can be improved.

[0140] Furthermore, the vehicle-mounted display device 3 involved in Technology 8 of this embodiment is the vehicle-mounted display device 3 described in Technology 6 or 7. In this case, if the number of results output by the multiple defect detection units 42 (defect detection units 42 of multiple monitoring devices 40a, 40b) indicating that a defect occurred during rendering is above a predetermined threshold, the connection status management unit 33 switches the multiple display control units 31a, 31b from terminal images to vehicle-mounted images, and causes the multiple vehicle-mounted display terminals 50a, 50b to display the vehicle-mounted images.

[0141] Therefore, if the number of defects occurring during rendering exceeds a predetermined threshold, it is considered that the probability of defects occurring during all rendering processes or subsequently occurring is high. Thus, all terminal images can be switched to in-vehicle images and displayed on in-vehicle display terminals 50a and 50b. Therefore, according to the in-vehicle display device 3, information can be appropriately displayed.

[0142] Furthermore, the vehicle-mounted display device 3 according to technology 9 of this embodiment is the vehicle-mounted display device 3 described in any one of technologies 6 to 8. In this case, when the connection status management unit 33 obtains the result that a defect has occurred in the drawing from one or more defect detection units 42, it causes the notification unit (vehicle-mounted display terminal 50a, 50b, etc.) mounted on the vehicle 2 to notify the contents of the defect.

[0143] Therefore, the system can notify passengers of any adverse conditions that may arise, allowing them to understand the situation and take appropriate measures to resolve it.

[0144] Furthermore, in the vehicle-mounted display method according to technology 10 of this embodiment, the vehicle-mounted display terminal 50 mounted on the vehicle 2 displays any one of the vehicle-mounted images of the vehicle-mounted devices 10, 10a, 10b, and 10c mounted on the vehicle 2 and the terminal image of the portable terminal 5 held by the passenger of the vehicle 2. The vehicle-mounted display method includes: a first image acquisition unit 11 acquiring a terminal image from the portable terminal 5; a second image acquisition unit 21 acquiring vehicle-mounted images from the vehicle-mounted devices 10, 10a, 10b, and 10c; a defect detection unit 42 detecting defects in the drawing process during the generation of the terminal image; and when the defect detection unit 42 detects defects in the drawing process during the generation of the terminal image, switching from the terminal image to the vehicle-mounted image, and the display control unit 31 causing the vehicle-mounted display terminal 50 to display the vehicle-mounted image.

[0145] This method achieves the same effect as described above.

[0146] Furthermore, the program involved in technology 11 of this embodiment is a program for executing the vehicle-mounted display method of technology 10 by a computer.

[0147] This method achieves the same effect as described above.

[0148] (Other variations)

[0149] The in-vehicle display device, in-vehicle display method, and program disclosed herein have been described above based on the aforementioned embodiments, but this disclosure is not limited to these embodiments. Various modifications to the embodiments that can be conceived by those skilled in the art without departing from the spirit of this disclosure may also be included within the scope of this disclosure.

[0150] For example, the display control system 1 described in the above embodiments can also be Figure 9 The structure shown. Figure 9 This is another block diagram illustrating the display control system 1 involved in other variations. For example... Figure 9 As shown, the multiple first image acquisition units 11a, 11b and the multiple terminal memories 12a, 12b may not be mounted on the vehicle-mounted device 10c. In this case, the multiple first image acquisition units 11a, 11b and the multiple terminal memories 12a, 12b may be mounted on the portable terminal 5 or may be separate from the portable terminal 5.

[0151] Furthermore, the various structural elements of the in-vehicle display device described in the above embodiments, such as the in-vehicle equipment and monitoring equipment, are typically implemented as LSIs (Liquid Crystal Sensors) of integrated circuits. They can be individually chipped or chipped in a manner that includes some or all of them.

[0152] Furthermore, integrated circuitry is not limited to LSIs; it can also be achieved through dedicated circuits or general-purpose processors. Alternatively, FPGAs (Field Programmable Gate Arrays) capable of programming the LSI after its fabrication, or reconfigurable processors capable of reconfiguring the connections and settings of the circuit cells within the LSI, can be used.

[0153] Furthermore, in the above embodiments, each structural element may be constructed using dedicated hardware, or implemented by executing software programs suitable for each structural element. Each structural element may also be implemented by a program execution unit such as a CPU or processor reading and executing software programs recorded on storage media such as hard disks or semiconductor memories.

[0154] Furthermore, all the numbers used above are illustrative for the purpose of specifically illustrating this disclosure, and the implementation of this disclosure is not limited by the illustrative numbers.

[0155] Furthermore, the segmentation of functional blocks in the block diagram is one example. Multiple functional blocks can also be implemented as a single functional block, or a single functional block can be divided into multiple functional blocks, or some functionality can be transferred to other functional blocks. Additionally, the functionality of multiple functional blocks with similar functions can be processed in parallel or time-division by a single piece of hardware or software.

[0156] Furthermore, since the order of the steps in the execution flowchart is illustrative for the purpose of specifically illustrating this disclosure, it may also be in a different order than described above. Additionally, some of the steps described above may be executed simultaneously (in parallel) with other steps.

[0157] Furthermore, this disclosure also includes various modifications to the above-described embodiments that would be conceived by those skilled in the art, and methods implemented by arbitrarily combining structural elements and functions in the embodiments without departing from the spirit of this disclosure.

[0158] Industrial availability

[0159] The vehicle-mounted display device, vehicle-mounted display method, and program disclosed herein can be used, for example, in vehicles equipped with one or more display devices, other devices and systems besides vehicles.

[0160] Explanation of reference numerals in the attached figures

[0161] 2: Vehicle; 3: Vehicle-mounted display device; 5: Portable terminal; 10, 10a, 10b, 10c: Vehicle-mounted equipment; 11, 11a, 11b: First image acquisition unit; 21: Second image acquisition unit; 23: Application program unit; 31, 31a, 31b: Display control unit; 33: Connection status management unit; 42: Malfunction detection unit; 50, 50a, 50b: Vehicle-mounted display terminal (notification unit).

Claims

1. A display device for a vehicle that causes a vehicle-mounted display terminal mounted on a vehicle to display either a vehicle-mounted image of a vehicle-mounted device mounted on the vehicle or a terminal image of a portable terminal held by an occupant who rides in the vehicle, the display device for a vehicle comprising: a first image acquisition section that acquires the terminal image from the portable terminal; a second image acquisition section that acquires the vehicle-mounted image from the vehicle-mounted device; a defective condition detection section that detects a defective condition of drawing in a generation process of the terminal image; and a display control section that switches from the terminal image to the vehicle-mounted image when the defective condition detection section detects a defective condition of drawing in the generation process of the terminal image, and causes the vehicle-mounted display terminal to display the vehicle-mounted image.

2. The display device for a vehicle according to claim 1, wherein the vehicle-mounted image includes a first vehicle-mounted image and a second vehicle-mounted image, the display device for a vehicle has an application section for starting a first application for displaying the first vehicle-mounted image and a second application for displaying the second vehicle-mounted image that has an information amount less than that of the first vehicle-mounted image, and the application section starts the first application in a case where the portable terminal is not connected to the display device for a vehicle in a communicable manner.

3. The display device for a vehicle according to claim 2, wherein the application section stops the first application, starts the second application, and the display control section switches display from the vehicle-mounted image to the terminal image in a case where the portable terminal is connected to the display device for a vehicle in a communicable manner.

4. The display device for a vehicle according to claim 3, wherein the application section starts the first application when the display control section switches from the terminal image to the second vehicle-mounted image and causes the vehicle-mounted display terminal to display the second vehicle-mounted image in a case where the defective condition detection section detects a defective condition of drawing in the generation process of the terminal image after the second application is started, and the display control section switches from the second vehicle-mounted image to the first vehicle-mounted image after the start of the first application is completed, and the application section stops the second application.

5. The display device for a vehicle according to any one of claims 2 to 4, wherein the defective condition detection section further detects a communication connection condition of the portable terminal to the display device for a vehicle, and the vehicle-mounted display terminal displays a defective condition of the communication connection condition of the portable terminal to the display device for a vehicle or a defective condition of drawing in the generation process of the terminal image based on the presence or absence of the defective condition of drawing in the generation process of the terminal image and the communication connection condition.

6. The display device for a vehicle according to any one of claims 1 to 4, wherein the display device for a vehicle has a plurality of the defective condition detection sections. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The in-vehicle display device includes a connection state management unit that manages results output from a plurality of the abnormality detection units so that the plurality of in-vehicle display terminals display the terminal image or the in-vehicle image.

7. The in-vehicle display device according to claim 6, wherein The connection state management unit, in a case where it is determined that an abnormality has occurred in the rendering based on the results output from the plurality of abnormality detection units, and in a case where the terminal image has not changed for a predetermined period or more and the abnormality detection unit determines that an abnormality has occurred in the rendering, determines that only the terminal image has not changed and that no abnormality has occurred in the rendering in the generation process of the terminal image if no abnormality has occurred in the rendering in other results than the result, and causes the plurality of in-vehicle display terminals to continue to display the terminal image.

8. The in-vehicle display device according to claim 6, wherein The connection state management unit, in a case where the number of results output from the plurality of abnormality detection units in which an abnormality has occurred in the rendering is equal to or greater than a predetermined threshold, causes the plurality of display control units to switch from the terminal image to the in-vehicle image, and thereby causes the plurality of in-vehicle display terminals to display the in-vehicle image.

9. The in-vehicle display device according to claim 6, wherein The connection state management unit, in a case where an abnormality has occurred in the rendering is acquired from one or more of the abnormality detection units, causes a notification unit mounted on the vehicle to notify of the content of the abnormality that has occurred.

10. An in-vehicle display method of causing an in-vehicle display terminal mounted on a vehicle to display either of an in-vehicle image of an in-vehicle device mounted on the vehicle and a terminal image of a portable terminal held by an occupant who rides the vehicle, the in-vehicle display method comprising: a first image acquisition unit that acquires the terminal image from the portable terminal; a second image acquisition unit that acquires the in-vehicle image from the in-vehicle device; an abnormality detection unit that detects an abnormality in rendering in a generation process of the terminal image; and a display control unit that switches from the terminal image to the in-vehicle image when the abnormality detection unit detects an abnormality in rendering in the generation process of the terminal image, the display control unit causing the in-vehicle display terminal to display the in-vehicle image.

11. A program product for causing a computer to execute the in-vehicle display method according to claim 10.

12. A program storage medium that is a non-transitory program storage medium that is readable by a computer, the program storage medium storing a program for causing a computer to execute the in-vehicle display method according to claim 10.

Images