JP3957612B2 - In-vehicle display system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle display system that simultaneously displays the same image on a plurality of display devices mounted on a car.
[0002]
[Prior art]
Car navigation systems and other in-vehicle display systems are used to display a map and current location on the display at the same time to provide directions to the destination, and to display images such as TVs and DVDs and enjoy the images in the car. It is done. Normally, an in-vehicle display system is installed on a console panel that can be seen by the driver (hereinafter, the part including the space wall part that forms the front seat part including the console part is referred to as the front seat), and the image displayed on the display Can be seen by a person who rides in the front seat, for example, a driver, but cannot be seen by a person who rides in the rear seat (the part including the space wall portion forming the rear seat portion is called the rear seat).
[0003]
On the other hand, there is a case where a display is also installed in the rear seat so that the image from the car navigation system can be seen in the rear seat. In this case, it is possible to provide a switching circuit to switch the image to be displayed on the display and to simultaneously display the image of the front seat on the rear seat (disclosed in Japanese Patent Application No. 11-343438).
[0004]
[Patent Literature]
Japanese Patent Application No. 11-343438
[0005]
[Problems to be solved by the invention]
However, in the technique of the above publication, the same image displayed on the other display at the same time while looking at the image specifically displayed on each display between the passengers who are boarded separately in the front seat and the rear seat When people in the same car usually share the situation, such as aiming at the same destination, but they are watching the video that is uniquely displayed on each display Inconveniently, the information obtained from the video cannot be shared at the same time.
[0006]
For example, if only the front seat driver knows the current position from the information on the car navigation displayed on the front seat display, but the current position is close to a tourist attraction, If you don't know it, people in the backseat may miss a tourist attraction. Also, when the vehicle is close to a curve, the person on the back seat suddenly reaches the curve and cannot move comfortably due to a loss of posture.
[0007]
Of course, it can be said that it is only necessary to stop viewing the video displayed on each display and switch the display screen so that only the video displayed on the other display can be viewed. The passenger's satisfaction obtained from viewing the video displayed on the display is impaired, and the passengers are prevented from comfortably spending time in the vehicle.
[0008]
An object of the present invention is to provide an in-vehicle display system capable of displaying an image to be displayed on another display together with a video unique to each display in a plurality of display devices mounted on a vehicle. .
[0009]
[Means for Solving the Problems]
The object is an in-vehicle display system, a first display panel, a second display panel, image data acquisition means for acquiring first image data and second image data, and a first display panel. The first display control unit for displaying the first image data, the instruction means for instructing the display of the composite image, and receiving the instruction, the first image data and the second image data are combined to And a second display control unit for displaying on the second display panel. This is achieved by an in-vehicle display system.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an in-vehicle display system according to the present invention will be described below with reference to the drawings.
<Configuration>
The in-vehicle display system of the embodiment includes a GPS function that analyzes position information sent from a satellite, identifies a current vehicle body position, and displays it on a map, and receives and reproduces a TV broadcast, DVD, etc. A function of reproducing a video recorded on a recording medium such as an optical recording medium.
[0011]
FIG. 1 is a block diagram showing the overall configuration of the in-vehicle display system 1.
As shown in FIG. 1, it includes a system main body 10, a front seat display device 11, a rear seat display device 12, a GPS antenna 13, and a bus 14.
FIG. 2 is a diagram for explaining a switching mode of images displayed on each display device together with the detailed configuration of the system main body 10.
[0012]
The system main body 10 receives the position information received from the GPS antenna and analyzes it to calculate the current position of the vehicle body, a memory 102A for storing various image data, a decoder 102B, a memory 102A, and a decoder 102B. And a controller 103 that controls the output data amount and output destination of the image data and the switching between the composite screen display and the single screen display.
[0013]
The controller 103 includes a CPU and a memory in which various programs are stored. Then, the read / destination of image data to be transmitted to the front seat display device and the rear seat display device is switched. Switching is performed at a timing corresponding to one frame when the front seat display device and the rear seat display device display a single screen. That is, when image data such as a map and position information stored in the memory is displayed on the front seat display device, the image data is read from the memory 102A for one frame and output to the front seat display device. Thereafter, when displaying the image data output from the decoder on the rear seat display device, the image data corresponding to one frame is read from the decoder 102B and output to the rear seat display device. In this way, the reading destination and transmission destination are switched with one frame as a cycle.
[0014]
When the rear seat display device is a composite screen display, image data to be displayed on the front seat display device and image data to be displayed on the rear seat display device are transmitted in parallel to the rear seat display device. Thus, the amount of data to be transmitted and the transmission destination are switched.
The composite screen display means that the image data that should be originally displayed on the rear seat display device and the image data that should be originally displayed on the front seat display device are combined and displayed by a predetermined arithmetic processing.
[0015]
Single screen display means that only image data that should be originally displayed on the rear seat display device is displayed.
And it is good also as selecting the mode of the screen display which can switch from a single screen display to a composite screen display by input operation from a user's user interface, and you may set it as fixedly switchable. .
[0016]
The controller 103 determines whether to switch between single screen display and composite screen display. This determination is made based on travel position information indicating the travel position of the vehicle body. Specifically, the current travel position of the vehicle body reaches the switching position indicated in the switching position information by comparing the traveling position information of the vehicle body with the switching position information that is information about the position to switch the screen display held in advance. Depending on whether or not. As a result of this determination, an opportunity for switching (an opportunity for switching between single screen display and composite screen display) is specified.
[0017]
As shown in FIG. 3, the switching position information includes tourist attractions (temples, valleys, etc.) and road positions (turning corners, crossings, intersections, etc.). In addition, information (map attribute) indicating an attribute corresponding to the switching position information is attached to each position on the map, and is stored in a predetermined storage means (memory) together with the map display program. The attribute information (map attribute) obtained from the map at the current position is used as the travel position information, and this attribute information is compared with the switching position information.
[0018]
The switching position information may be selected by the user. User selection is performed by an input operation from the user interface.
The front seat display device 11 is installed on a space wall forming the front seat of the vehicle body, and may be any display such as LCD, PDP, EL, CRT. The display panel 111 includes a display control unit 112 that stores image data, performs composite image processing, and outputs image data to the panel 111.
[0019]
The rear seat display device 12 is installed on a space wall forming the rear seat of the vehicle body, and may be any display such as LCD, PDP, EL, CRT. The display panel 121 includes a display control unit 122 that includes an output unit that stores image data, performs composite image processing, and outputs the image data to the panel 121. The display control unit 122 has composite screen display flag information indicating that an image is displayed on a composite screen or a single screen. When it is a composite screen, the value of the composite screen display flag information is set to 1, and when it is a single screen, the value of the composite screen display flag information is set to 0.
[0020]
The GPS antenna 13 receives a signal indicating position information sent from a satellite and outputs the signal to the system body. It is provided on the car body top plate.
The bus 14 is a transmission path having a predetermined bus width that connects the system main body 10 and the display devices 11 and 12 so as to be able to transmit data, and is provided on the floor of the vehicle.
[0021]
<Operation>
FIG. 4 is a diagram for explaining an operation of automatically switching from a single screen display to a composite screen display by a user selection of the in-vehicle display system 1 or by a fixed setting.
S1: Based on the position information calculated by the calculation unit 101, the controller 103 specifies the current position of the vehicle body. Next, the process proceeds to S2.
[0022]
S2: The controller 103 determines whether or not the display position of the rear seat display device is switched from the specified current position, and specifies the position to be switched. If Yes, the process moves to S3, and if No, the process returns to S1.
S3: The controller 103 determines whether or not the rear seat is a composite screen display with reference to the composite screen display flag information. If the value of the combined screen display flag information is 1 (Yes), the process jumps to S8, and if the value of the combined screen display flag information is 0 (No), the process proceeds to S4.
[0023]
S4: The controller 103 outputs the image data to be originally displayed on the front seat display (front seat image data) to the rear seat display together with the image data to be originally displayed on the rear seat display device (rear seat image data). Next, the process proceeds to S5.
S5: The controller 103 notifies the rear seat display device that the composite screen is to be displayed. Next, the process proceeds to S6.
[0024]
S6: In the rear seat display device, the value of the composite screen display flag information is set to 1. Next, the process proceeds to S7.
S7: The rear seat display device synthesizes and displays the acquired front seat image data and rear seat image data. The display screen can be, for example, a screen that has been subjected to a calculation in which each pixel data is multiplied by a predetermined coefficient and added. The synthesis screen is shown in FIG. In FIG. 2, when the front seat image data is TV broadcast video information and the rear seat image data is a map and position information, the image of the front seat is combined with the rear seat image and displayed in the rear seat. A display example is shown. Next, the process proceeds to S8.
[0025]
S8: Based on the position information calculated by the calculation unit 101, the controller 103 specifies the current position of the vehicle body. Next, the process proceeds to S9.
S9: The controller 103 determines whether it is a position to switch the display of the rear seat display from the specified current position, that is, a position to switch from the composite screen display to the single screen display, and specifies the position to switch. This determination is made based on whether or not the position to be switched to the composite screen display has been passed. For example, the distance that has passed the position to be switched to the composite screen display exceeds a predetermined distance. It is possible to judge that it has passed if it has passed. If Yes, the process moves to S10, and if No, the process returns to S7.
[0026]
S10: The controller 103 changes the output image data from the memory decoder so that only the front seat image data is output to the front seat display and only the rear seat image data is output to the rear seat display. Next, the process proceeds to S11.
S11: The controller 103 notifies the rear seat display device that a single screen display is to be performed. Next, the process proceeds to S12.
[0027]
S12: In the rear seat display device, the value of the composite screen display flag information is set to zero.
Thereafter, the rear seat display device performs a single screen display.
As described above, according to the in-vehicle display system according to the present embodiment, the image data that should be originally displayed on the front seat display device based on the position information of the vehicle body is also displayed on the rear seat display device by combining the images. Therefore, the same image can be displayed on the front seat and the rear seat, and passengers in the front seat and the rear seat can simultaneously share information obtained from the images displayed on the display. .
[0028]
In addition, the in-vehicle display system according to the present embodiment takes into account the peculiarity that the person in the vehicle has a different viewpoint depending on the seat on which the person sits. Usually, people who are seated in the backseat are watching the video displayed on the display installed in the backseat, so it is impossible to always see the video displayed on the display installed in the front seat. There is peculiarity. However, according to the in-vehicle display system according to the present embodiment, image data that should be originally displayed on the front seat display can be displayed on the rear seat display at the same time by combining the images. Considered.
[0029]
(Other matters)
(1) In the above description, the screen display of the rear seat is based on the position information of the vehicle body and is a composite screen display that displays the content of the front seat. A composite screen may be displayed by operating a button from the user interface.
[0030]
(2) The display screen may be automatically switched on the front seat display. For example, when a vehicle speed sensor is installed, the vehicle speed is detected from the car navigation screen showing the map and the position information at the timing when the vehicle speed becomes zero, and a composite screen for combining and displaying images such as TV broadcasts on this You may switch to a display (refer FIG. 2). Note that a composite screen display may be displayed by a button operation from the user interface.
[0031]
{Circle around (3)} In this example, an example in which two display devices are used has been described. However, it is obvious that any number of display devices can be used.
Next, a technique for reading out image data from a memory and generating a composite screen on a display and details of processing capable of improving bus traffic will be described.
(Image processing technology; plain synthesis technology)
FIG. 5 shows a configuration of an in-vehicle display system 50 that uses a plane composition technique as a technique for generating a composition screen.
[0032]
The in-vehicle display system 50 includes, for example, a memory 53 having means for storing image data of a moving image or a still image plane, an AV decoder 54 having means for outputting image data, a front seat display panel 55, a rear seat display, and the like. The front seat display control device 51 receives image data from the panel 56, the memory 53, and the AV decoder, selects an image plane, and outputs image data of an arbitrary image plane to the front seat display panel 55 and the rear seat display panel 56. And a rear seat display control device 52. Here, the image plane means image data corresponding to one frame.
[0033]
The front seat display control means 51 and the rear seat display control device 52 are respectively provided with arithmetic logic operation units 511 and 521, and when an arbitrary image plane is selected, performs a logic operation process between the selected image planes. Thereby, as a calculation result, for example, it is possible to synthesize and output a semi-transparent image plane on a moving image plane.
[0034]
FIG. 5 illustrates that the arithmetic logic operation unit 511 combines and outputs the planes 1, 3, and 5, and the arithmetic logic operation unit 521 indicates that the planes 2 and 5 are combined and output. .
In FIG. 6, an arbitrary plane when two types of images are output to the front seat display panel 55 and the rear seat display panel 56 by the two display control devices of the front seat display control device 51 and the rear seat display control device 52, respectively. The structure which acquires is shown.
[0035]
Each display control device 51 (52) has a buffer 512 (522) having means for storing a part or all of the received image data of a plurality of moving images or still image planes, and counts pixels when receiving the image data. Alternatively, a pixel counter 513 (523) having means for extracting an arbitrary rectangular area of the image data of the still image plane and storing it in the buffer 512 (522), and an arithmetic logic operation unit 511 (521) having means for selectively combining the image data. ).
[0036]
A method of acquiring an arbitrary plane with such a configuration will be described.
FIG. 7 shows the method. In FIG. 8, an example of the image data of the moving image or still image plane received by each display control device 51 (52) is shown, the image signal 81 of the image data 91 (FIG. 9) of the first moving image or still image plane, An image signal 82 of the image data 92 (FIG. 9) of the second moving image or still image plane, a pixel synchronization signal 83 and a horizontal synchronization signal 84 synchronized with the image data 91, and a pixel synchronization signal 85 synchronized with the image data 92 An example with the horizontal synchronization signal 86 is given. The image data to be output here is assumed to be data such as AV data that is displayed in 1/60 seconds per plane and data such as TV broadcast that is displayed in 1/30 seconds per plane. Both data are output in parallel via the bus. As a result, the output of the pixel signal of the image signal 82 is performed at a frequency about twice that of the output of the pixel signal of the image signal 81.
[0037]
First, as indicated by (1) in FIG. 7, the horizontal acquisition start position corresponding to the image data displayed in the horizontal direction of the screen is calculated by counting the pixel synchronization signal from the data start position of one plane.
Next, as indicated by (2), the vertical acquisition start position corresponding to the image data displayed in the vertical direction of the screen is calculated by counting the horizontal synchronization signal and the pixel synchronization signal.
[0038]
Next, as indicated by (3), the data for the rectangular width is obtained by counting the pixel synchronization signal by a predetermined rectangular width.
Thereafter, the processes (2) and (3) are repeated for the number of lines.
The process ends when the horizontal synchronization signal for the rectangular width is counted from the vertical acquisition start position.
[0039]
It is assumed that image data is output from the memory one line at a time.
A specific example of acquiring an arbitrary plane will be described below. In the following example, the number of vertical and horizontal pixels in the image data 91 is 4, and the number of vertical pixels in the image data 92 is 4 and the number of horizontal pixels is 8.
[0040]
First, the number of pixels having the width of the image data 91 and the number of pixels having the width of the image data 92 are set in the pixel counter 513 and the pixel counter 523. Next, for the pixel counter 513, the acquisition start horizontal synchronization count of the image data 91 is set to 0, and the acquisition stop horizontal synchronization count of the image data 91 is set to 3. Further, the acquisition start horizontal synchronization count of the image data 92 is set to 4 for the pixel counter 513. Also, the acquisition stop horizontal synchronization count of the image data 92 is set to 7.
[0041]
Next, for the pixel counter 523, the acquisition start horizontal synchronization count of the image data 91 is set to 0, and the acquisition stop horizontal synchronization count and the acquisition stop vertical synchronization count of the image data 91 are set to 3. Also, the acquisition start horizontal synchronization count of the image data 92 is set to zero. Also, the acquisition stop horizontal synchronization count of the image data 92 is set to 3. As described above, for the pixel counter 513 and the pixel counter 523, the pixel position of an arbitrary rectangular area in the acquired image data can be set, whereby the front seat display control device 51 can set the image at the time T1. Acquisition of the signal data A and image signal data D at time T5 is started. Further, the rear seat display control device 52 starts acquiring the image signal data A at time T1 and the image signal data C at time T1. Then, the acquisition of the image data for acquiring the image data of the set rectangular area is ended.
[0042]
The setting of the acquisition start horizontal synchronization count determines the vertical position of the pixel data to be acquired, and the setting of the acquisition stop horizontal synchronization count determines the vertical position at which the acquisition of the pixel data ends.
As described above, by using the pixel counter, it is possible to acquire image data of an arbitrary rectangular area of a moving image or a still image plane.
[0043]
In this way, the acquired image data is multiplied or added by an arbitrary coefficient in each arithmetic logic unit, thereby selecting or synthesizing image data of an arbitrary rectangular area of each moving image or still image plane and displaying it on the display. Can be output.
FIG. 9 shows a schematic diagram of image data synthesis. FIG. 9 shows a moving image or still image plane acquired when the pixel counter is set as described above (the number of vertical and horizontal pixels is 4 in the image data 91 and the number of vertical pixels in the image data 92 is 4 and the number of horizontal pixels is 8.) According to the above example, the entire area of the image data 91 and the partial area of the image data 92 of the moving image or still image plane are combined in the display control device 51 (52). That is, the image data 92 of the moving image or still image plane is divided into two areas by the pixel counter 513 (523) and synthesized with the image data 91 which is the same source, respectively, and then the front seat display panel 55 and the rear It can be output to the seat display 56.
[0044]
In addition, although the example which acquires several plane data simultaneously at each time was given, using the buffer 512 and the buffer 522, each data may be received separately and may be processed.
Further, in this example, an example in which two display control devices are used has been described, but it is obvious that the display control device can support an arbitrary number.
(Improved bus traffic 1)
FIG. 10 shows a configuration of an in-vehicle display system 100 that can improve bus traffic.
[0045]
The in-vehicle display system 100 includes a front seat display panel 101, a front seat display control device 102 connected thereto, a rear seat display panel 103, a rear seat display control device 104 connected thereto, and a front seat display. A queue 105 that stores addresses of data requests from the control device 102 and the rear seat display control device 104, an address addition device 107 that adds addresses to the data retrieved from the memory 106, a front seat display control device 102, and a rear seat display A controller 108 for managing a request address stored in the queue 105 and managing an address adding device, which includes a data request from the control device 104, a memory storing a CPU and various control programs, and a front seat display control device 102 And the bus 10 for transmitting and receiving data requests from the rear seat display control device 104 When, and a bus 110 for broadcast transmission data acquired from the memory to the full display controller, and a bus 111 connecting the memory and the queue and address adding unit.
[0046]
FIG. 11 shows the configuration of the front seat display control device 102 and the rear seat display control device 104.
The front seat display control device 102 (rear seat display control device 104) is connected to the front seat display panel 101 (rear seat display panel 103), and stores a buffer 1021 (buffer 1031) for storing pixel data and an address comparator 1022 (address). A comparator 1032) and an address table 1023 (address table 1033).
[0047]
The operation of the in-vehicle display system configured as described above will be described with reference to FIGS.
In FIG. 12, the front seat display control device 102 acquires the pixel data stored in the memory 106, generates image data 1201, the scanning line 1202 from which the front seat display control device 102 is about to acquire the pixel data, and the rear The image data 1203 that the seat display control device 104 acquires and stores the pixel data stored in the memory 106 and the scanning line 1204 that the rear seat display control device 104 is about to acquire the pixel data are shown.
[0048]
Hereinafter, in this example, the rectangular area 1205 in the image data 1201 and the rectangular area 1206 in the image data 1203 are the same set of pixel data, and the pixel data constituting the image data are at the same position in the memory 106. Assuming a stored state, an operation of acquiring pixel data on the scan line 1202 and pixel data on the scan line 1204 will be described as an example.
[0049]
First, the front seat display control device 102 requests the controller 108 for pixel data for the scanning line with the address of the pixel 1207 at the head, and simultaneously stores the head request address in the queue 105. Next, the front seat display control apparatus 102 requests the controller 108 for pixel data corresponding to the width of the rectangular area with the address of the pixel 1208 at the head, and simultaneously stores the head request address in the queue 105.
[0050]
Next, the rear seat display control device 104 requests the controller 108 for pixel data for the scanning line starting from the address of the pixel 1209, and simultaneously stores the head request address in the queue 105. Next, the rear seat display control device 104 requests the controller 108 for pixel data corresponding to the width of the rectangular area with the address of the pixel 1210 at the head, and simultaneously stores the head request address in the queue 105.
[0051]
Here, the address request is made with respect to the start address of each block in which 16 pixels per pixel is 16 bytes, that is, 8 pixels are one block, and pixel data is transmitted from the memory 106 to each display controller in units of one block. Is done.
It goes without saying that the address request is made for an address of one pixel, and pixel data is transmitted from the memory 106 to each display control device in units of one pixel.
[0052]
The controller 108 issues an instruction to the queue 105 to transmit to the memory 106 in order from the first request address that has arrived first in the queue 105. The queue 105 receives the command and transmits it to the memory 106 in order from the head request address that arrives first. Next, the address adding device 107 receives data from the memory 106 in response to the transmitted request and broadcasts the data to all the display control devices, and then the queue 105 transmits the next stored request to the memory 106. Repeat the operation.
[0053]
Here, the front seat display control device 102 and the rear seat display control device 104 store addresses for which data is requested in the address tables 1023 and 1033, respectively.
Note that the broadcast transmission means that the same data is simultaneously transmitted to a plurality of destinations.
[0054]
In response to the request with the address A of the pixel 1207 of the front seat display control device 102 as the head in FIG. 13, the data A is received from the memory 106 and broadcast to all the display control devices, and then the front seat display control device 102 A state in which data B is received from the memory 106 in response to a request starting from the address B of the pixel 1208 is shown. The address C represents a request address starting from the pixel 1209 of the rear seat display control device 104, and the address D represents a request address starting from the pixel 1210 of the rear seat display control device 104. Here, address B and address D are the same address.
[0055]
When the address adding device 107 receives the data B, the controller 108 searches the queue 105 for an untransmitted request address for the memory 106 with the value of the address B, which is the data B request address.
Here, since address B and address D are the same address, request discard information is added to the request for address D. When the queue 105 transmits the data request at the address C to the memory 106 and then transmits the data request at the address D to the memory 106, the queue 105 confirms the request discard information and discards the data request at the address D.
[0056]
When the data B is broadcast to all the display control devices, the address B is broadcast before the data B as shown in FIG. The added address B is used for address comparison in each display controller as follows.
FIG. 15 shows the data reception operation of the rear seat display control device 104. First, the address B is received and compared with the address table 1033 to see if it matches the transmitted request address. If they do not match, the data is discarded. In FIG. 15, data B is stored at a position corresponding to the address D in the buffer 1031 in an example in which the address B and the address D match.
[0057]
In this example, when the data is received from the memory 106, the request address stored in the queue 105 is searched. However, when the data request from each display control device is stored in the queue 105, the memory If an unsent request address for 106 is searched and the same address exists, the same function can be realized by discarding the data request without storing it in the queue 105.
[0058]
Further, in this example, an example in which two display control devices are used has been described, but it is obvious that the display control device can support an arbitrary number.
(Bus traffic improvement 2)
FIG. 16 shows a configuration of an in-vehicle display system 160 capable of improving bus traffic.
[0059]
The in-vehicle display system 160 includes a front seat display panel 164, a front seat display control device 161 that is connected to the front seat display panel 164 and has a buffer 173 that stores pixel data and an address table 170, and a rear seat display 165. The rear seat display control device 162 is connected to the rear seat display 165 and has a buffer 174 for storing pixel data and an address table 171, and is connected to the front seat display control device 161 and the rear seat display control device 162. The front-seat display control device 161 and the rear-seat display control device 162 include a local buffer 166 that stores data, a bus 168 that serves as a transmission path for data from a memory and the like, and a memory that stores the CPU and various control programs. A controller 163 for controlling the data acquisition destination by And a bus 169 for transmitting and receiving data and control signals to and from the front-seat display control apparatus 161 and the rear-seat display control apparatus 162 and the controller 163.
[0060]
The operation of the in-vehicle display system 160 configured as described above will be described with reference to FIGS.
In FIG. 17, the front seat display control device 161 acquires the pixel data stored in the memory 167, the image data 1701 to be generated, the scanning line 1702 from which the front seat display control device 161 is about to acquire the pixel data, and the rear The image data 1703 that the seat display control device 162 acquires and stores the pixel data stored in the memory 167 and the scanning line 1704 that the rear seat display control device 162 is about to acquire the pixel data are shown. Hereinafter, in this example, the rectangular area 1705 in the image data 1701 and the rectangular area 1706 in the image data 1703 are the same set of pixel data, and the pixel data constituting the image data is stored at the same position in the memory 167. The operation of acquiring the pixel data on the scan line 1702 and the pixel data on the scan line 1704 will be described as an example, assuming the above-described state.
[0061]
FIG. 18 shows the data and control flow of the in-vehicle display system 160.
First, in the path 180, the CPU 175 causes the controller 163 to generate the address A on the memory 167 of the first pixel 1713 of the scanning line 1702 in the image data 1701 generated by the front seat display control device 161 and the rear seat display control device 162. An address B on the memory 167 of the first pixel 1714 of the scanning line 1704 in the image data 1703 to be processed, an address C on the memory 167 of the first pixel 1711 of the rectangular area 1705 of the image data 1701 generated by the front seat display control device 161, The address D on the memory 167 of the first pixel 1712 of the rectangular area 1706 of the image data 1703 generated by the rear seat display control device 162 is transmitted.
[0062]
Next, on the path 181, the controller 163 transmits the address received from the CPU 175 to the front seat display control device 161 and the rear seat display control device 162, and the front seat display control device 161 stores the address A and address C in the address table. The rear seat display control device 162 stores address B and address D in the address table 171. At this time, the controller 163 stores the common address acquired by the front seat display control device 161 and the rear seat display control device 162 in the address table 172. Here, address C and address D are the same address, and this address is denoted as address E.
[0063]
Thereafter, in order for the front seat display control device 161 and the rear seat display control device 162 to generate the image data 1701 and the image data 1703, an operation of requesting pixel data from the controller 163 is started.
Here, the address request is made with respect to the head address of each block in which 16 pixels per pixel is 16 bytes, that is, 8 pixels are one block, but pixel data is transmitted from the memory to each display control device in units of one block. Is done.
[0064]
It goes without saying that the address request is made for an address of one pixel, and pixel data is transmitted from the memory 106 to each display control device in units of one pixel.
An operation for sequentially acquiring the address A, the address C, the address B, and the address D, which are the addresses of the pixel data on the scan line 1702 and the scan line 1704 in FIG. 17, will be described.
[0065]
In the path 182, referring to the address table 170, the front seat display control device 161 requests the controller 163 for pixel data corresponding to the width of the rectangular area 1707 for the address A starting from the pixel 1713 on the scanning line 1702. The controller 163 compares the requested address A with the address E stored in the address table 172. If the controller 163 confirms that they are not the same address, the front seat display control device receives the data of the address A received from the memory 167 via the path 183. 161.
[0066]
Next, in the path 182, referring to the address table 170, the front seat display control device 161 requests the controller 163 for pixel data corresponding to the width of the rectangular area 1705 for the address C starting from the pixel 1711 on the scanning line 1702. . When the controller 163 compares the requested address C with the address E stored in the address table 172 and confirms that they are the same address, the controller 163 sends the data of the address C to the local buffer 166 to the front seat display control device 161. Issue an order to save.
[0067]
Next, the data of the address C received from the memory 167 is transmitted to the front seat display control device 161 through the path 183. The front seat display control device 161 receives the data of the address C and stores it in the buffer 173. At the same time, data is stored at an arbitrary position in the local buffer 166.
Thereafter, the data in the rectangular area 1705 is stored in the local buffer 166 until the address table 170 on the front seat display control device 161 is changed. The head address of the data in the rectangular area 1705 on the local buffer 166 at this time is set as an address F. When the front seat display control device 161 starts storing the data of the address C on the memory 167 in the local buffer 166, the front seat display control device 161 transmits the address F to the controller 163. Subsequently, on the path 184, the controller 163 A change command is transmitted to 162 so as to obtain an address D equal to the address E from the address F.
[0068]
Subsequently, in the path 185, referring to the address table 171, the rear seat display control device 162 requests the controller 163 for pixel data corresponding to the width of the rectangular area 1709 for the address B starting from the pixel 1714 on the scanning line 1704. . When the controller 163 compares the requested address B with the address E stored in the address table 172 and confirms that they are not the same address, the controller 163 transmits the data of the address B received from the memory 167 via the path 184. 162. The rear seat display control device 162 receives the data of the address B and stores it in the buffer 174.
[0069]
Next, the rear seat display control device 162 acquires the data of the address F on the local buffer 166 based on the command issued from the controller 163 to acquire the address D equal to the address E from the address F. The rear seat display control device 162 receives the data of the address F and stores it in the buffer 174.
When the front seat display control device 161 finishes acquiring the data of the rectangular area 1705 from the memory 167, the address C of the address table 170 is changed to the address F, and thereafter, the acquisition address change command is received from the controller 163. Until then, the rear seat display control device 162 acquires the data of the rectangular area 1705 from the local buffer 166.
[0070]
Further, the CPU sets the acquisition addresses of the front seat display control device 161 and the rear seat display control device 162 to the controller 163 when the rectangular region 1705 and the rectangular region 1706 are updated or when the image data 1701 and the image data 1703 are changed. By transmitting the command again, the front seat display control device 161 and the rear seat display control device 162 shift to an operation of acquiring update data on the memory 167.
[0071]
In this example, two display control devices are used as an example, but it is obvious that the same function can be achieved in the case of two or more display control devices.
Further, when the rear seat display control device 162 continues to acquire the data in the rectangular area 1705 from the memory 167 after the front seat display control apparatus 161 has acquired the data in the rectangular area 1705 from the memory 167, the local buffer 166 is used. Since the data can be acquired from the data, the data update information from the CPU 175 is not necessary and is effective when the data is constantly changing.
[0072]
In addition, the front seat display control unit can acquire image data for a desired screen, for example, one screen, and store it in a local buffer. In this case, the acquisition of image data by the rear seat display control unit can be controlled to change the acquisition source from the memory to the local buffer.
[0073]
【The invention's effect】
As described above, the present invention is an in-vehicle display system, and includes a first display panel, a second display panel, and image data acquisition means for acquiring first image data and second image data. A first display control unit for displaying the first image data on the first display panel, an instruction means for instructing display of the composite image, and the first image data and the second image data received by the instruction And a second display control unit that displays the result on the second display panel.
[0074]
Accordingly, the same image can be displayed simultaneously on a plurality of display panels mounted on the vehicle, so that passengers can simultaneously share information obtained from the images displayed on the display panel. In other words, since the person who sees the second image data displayed on the second display panel can also see the first image data at the same time, it can be obtained from the same image among those who see different display panels. Information can be shared at the same time.
[0075]
Here, the instruction means may specify a trigger for performing the composite display based on the travel position information of the vehicle body, and give the instruction at the trigger.
Thereby, since the opportunity that the first image data is simultaneously displayed on the second display panel is specified based on the vehicle body travel position, for example, the first image data is stored on the map and the vehicle body. In the case of image data that displays information indicating the traveling position, a person viewing the second display panel also obtains information obtained from the first image data indicating the traveling position of the vehicle body displayed on the first display panel. It can be obtained at the same time as that person, and the above-mentioned problems such as missing a tourist attraction or suddenly approaching a curve do not occur.
[0076]
Here, the instruction means compares the map attribute information about the current position of the vehicle body with the switching position information predetermined as the travel position of the vehicle body to start the composite display, and identifies the trigger for performing the composite display. , The instruction may be given at the opportunity.
Here, the image data acquisition means may include a bus for transmitting single or plural image data to the first display control unit and the second display control unit.
[0077]
Here, the first display control unit and the second display control unit further select a reception unit that receives image data of a plurality of image planes, select an arbitrary image plane, and image data between the selected planes. And an output means for outputting the image data to each display panel.
[0078]
As a result, the selected image data from any image plane can be appropriately combined and displayed.
Here, the first display control unit and the second display control unit include a pixel count unit that counts the number of pixels in the vertical and horizontal directions of each image plane and extracts a rectangular area, and the calculation unit is extracted. In addition, arithmetic logic operation processing may be performed on image data in an arbitrary rectangular area of each image plane.
[0079]
As a result, image data in an arbitrary area of the image plane can be selected and extracted, and appropriately combined with another image plane or the like for display.
Here, in the in-vehicle display system, further, a data request transmission unit that transmits data requests from the first display control unit and the second display control unit to the memory according to the priority order, and a first front seat display control unit And a data request conversion means for converting a plurality of read requests for the same data on the memory from the second display control unit into a single request, and the first display control unit and the second display for the data received from the memory Broadcast communication means for notifying the controller of the broadcast. As a result, the data received once from the memory can be received simultaneously by a plurality of display control devices, so that the number of data requests to the memory can be reduced, and the number of accesses from each display control device to the memory can be reduced. Thus, the hardware cost can be reduced.
[0080]
Here, in the in-vehicle display system, when the data received from the memory is further broadcast to the first display control unit and the second display control unit, the address of the data on the memory is assigned to the received data. Address adding means for adding and notifying the broadcast and address confirming means for confirming the address of the data notified by the broadcast may be included.
[0081]
Accordingly, each display control device can display only the data requested by itself even if the data is tampered with halfway.
Here, in the in-vehicle display system, further connected to the first display control unit and the second display control unit, a local buffer for storing all or part of the plurality of image data, and a bus connected to the memory And a controller that controls the acquisition destination of data acquired by the first display control unit and the second display control unit between the memory and the local buffer.
[0082]
As a result, the data received once from the memory can be read from the local buffer, so that the number of accesses to the memory from each display control device can be reduced and the bus traffic can be improved. Can be reduced.
Here, the controller includes an address management unit that manages an address on a memory of shared data shared by the first display control unit and the second display control unit, and a request for shared data from one display control device. Request accepting means for accepting data requests including data, data storage control means for controlling the display control unit accepting the request to store shared data in the local buffer, and other display control devices Data acquisition destination control means for controlling to change the acquisition destination from the memory to the local buffer and acquiring the shared data from the local buffer.
[0083]
Here, in the in-vehicle display system, when the shared data shared by the first display control unit and the second display control unit is acquired from the memory, image data for a desired screen is acquired, and the local buffer When the data is stored, the data acquisition destination control means for controlling to change the data acquisition destination from the memory to the local buffer may be included.
[0084]
As a result, the data received once from the memory can be read from the local buffer, so that the number of accesses to the memory from each display control device can be reduced and the bus traffic can be improved. Can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of an in-vehicle display system 1. FIG.
FIG. 2 is a diagram for explaining a switching mode of images displayed on each display device together with a detailed configuration of a system main body.
FIG. 3 is a diagram showing switching position information.
FIG. 4 is a diagram illustrating an operation of automatically switching from a single screen display to a composite screen display by a user selection of the in-vehicle display system 1 or by a fixed setting.
FIG. 5 is a diagram showing a configuration of an in-vehicle display system that adopts a plane synthesis technique as a technique for generating a synthesis screen.
FIG. 6 is a diagram showing a configuration for acquiring an arbitrary plane in the system.
FIG. 7 is an explanatory diagram of a method for acquiring an arbitrary plane.
FIG. 8 is a diagram illustrating output timing of an image and an image signal.
FIG. 9 is a schematic diagram of image data synthesis.
FIG. 10 is a diagram showing a configuration of an in-vehicle display system 100 capable of improving bus traffic.
11 is a diagram showing a configuration of a front seat display control device 102 and a rear seat display control device 104. FIG.
FIG. 12 is a view showing image data acquired by the system.
FIG. 13 is a diagram illustrating the operation of the system.
FIG. 14 is an output timing chart in the system.
FIG. 15 is a diagram showing a data reception operation of the rear seat display control device 104 in the system.
FIG. 16 is a diagram showing a configuration of an in-vehicle display system 160 capable of improving bus traffic.
FIG. 17 is a view showing image data acquired by the system.
FIG. 18 is a diagram for explaining the operation of the system.
[Explanation of symbols]
1 In-vehicle display system
10 System body
11 Front seat display device
12 Rear seat display device
13 GPS antenna
14 Bus
101 Calculation unit
102A memory
102B decoder
103 controller
513, 523 pixel counter
511, 521 arithmetic logic unit
105 queue
107 Address adding device
108 controller
109, 110, 111 bus
166 Local buffer
163 Controller
168, 169 bus

Claims (7)

An in-vehicle display system,
A first display panel;
A second display panel;
Image data acquisition means for acquiring the first image data and the second image data;
A first display control unit for displaying the first image data on the first display panel;
Instruction means for instructing display of the composite image;
A second display control unit that receives the instruction, combines the first image data and the second image data, and displays them on the second display panel;
The in-vehicle display system characterized in that the instruction means specifies an opportunity to perform composite display based on travel position information of a vehicle body, and gives the instruction at the opportunity. In Claim 1, the instruction means compares the map attribute information about the current position of the vehicle body with the switching position information predetermined as the travel position of the vehicle body to start the composite display, and triggers the composite display. The vehicle-mounted display system according to claim 1 , wherein the instruction is specified and triggered. An in-vehicle display system,
A first display panel;
A second display panel;
Image data acquisition means for acquiring the first image data and the second image data;
A first display control unit for displaying the first image data on the first display panel;
Instruction means for instructing display of the composite image;
Receiving the instruction, a second display control unit configured to combine the first image data and the second image data and display on the second display panel;
Data request transmission means for transmitting data requests from the first display control unit and the second display control unit to the memory according to the priority order; and
Data request conversion means for converting a plurality of read requests for the same data on the memory from the first front seat display control unit and the second display control unit into a single request;
A vehicle-mounted display system comprising: broadcast communication means for broadcasting the data received from the memory to the first display control unit and the second display control unit. The in- vehicle display system according to claim 3 , further comprising:
An address adding means for adding the address of the data on the received data to the first display control unit and the second display control unit for broadcast notification of the data received from the memory, and notifying the broadcast;
The vehicle-mounted display system according to claim 3, further comprising: an address confirmation unit that confirms an address of the broadcast notified data. An in-vehicle display system,
A first display panel;
A second display panel;
Image data acquisition means for acquiring the first image data and the second image data;
A first display control unit for displaying the first image data on the first display panel;
Instruction means for instructing display of the composite image;
Receiving the instruction, a second display control unit configured to combine the first image data and the second image data and display on the second display panel;
A local buffer connected to the first display control unit and the second display control unit for storing all or part of the plurality of image data;
Characterized in that it comprises a controller for controlling the memory connected data location where the first display control unit connected to the bus and a second display control unit acquires between the memory and local buffer, the In-vehicle display system. The controller of claim 5 comprises:
Address management means for managing addresses on a memory of shared data shared by the first display control unit and the second display control unit;
Request accepting means for accepting a request for data including a request for shared data from one display control device;
Data storage control means for controlling the display control unit that has received the request to store shared data in the local buffer;
To other display control apparatus, to claim 5, characterized in that the acquisition source of the shared data including a data acquisition source control means for controlling to acquire a shared data changed from the memory to the local buffer from local buffer The in-vehicle display system described. An in-vehicle display system,
A first display panel;
A second display panel;
Image data acquisition means for acquiring the first image data and the second image data;
A first display control unit for displaying the first image data on the first display panel;
Instruction means for instructing display of the composite image;
Receiving the instruction, a second display control unit configured to combine the first image data and the second image data and display on the second display panel;
When the shared data shared by the first display control unit and the second display control unit is acquired from the memory, the image data for the desired screen is acquired and stored in the local buffer. An in-vehicle display system comprising: a data acquisition destination control unit that controls to change to a local buffer.

Images