JP2009075842A - On-vehicle display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle display device which eliminates poor visibility due to the distance with respect to a display. <P>SOLUTION: This on-vehicle display device includes the display fixedly arranged inclining to right or left in relation to the front direction of a sitting user, and image correction means which corrects images so that the larger the viewpoint distance of an image region viewing pixels on the display screen of the display is, the larger the display enlargement ratio is. The image correction means enlarges the display enlargement ratio as the viewing distance becomes larger at least in the lateral direction of the display screen of the display. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an in-vehicle display device.

  As the vehicle travels, the current position is detected by GPS (Global Positioning System), etc., and the current position is displayed on a display device together with a road map, and an appropriate route from the starting point to the destination A vehicle navigation device that guides the user with a display or a voice output device contributes to efficient and safe driving for the user.

  In many cases, the display device of the vehicle navigation device is arranged near the center console in consideration of the convenience of both the driver and the passenger on the passenger seat. In this case, for example, when the driver looks at the display screen of the display unit, the viewpoint distance from the driver to the display screen increases toward the left side of the screen (that is, the passenger seat side), and the viewpoint distance is far from the driver. There is a problem that the display at a certain position is too small to be seen or difficult to see (due to the relationship of two-point perspective). Also, the passenger seat side is the reverse phenomenon of the driver seat side.

  Therefore, in a projector having an electronic blackboard function, oblique projection with distortion correction is possible without impairing the projection illuminance, and reverse correction of the projected video distortion correction is performed on the photographed video. A projection apparatus and a projection method having an electronic blackboard function having a function of canceling distortion of a photographed image by applying correction have been devised (see Patent Document 1).

  In addition, a display device has been devised that has two screens, and these screens can be adjusted so that the screen faces an arbitrary viewpoint (see Patent Document 2).

JP 2005-64667 A JP 2000-112394 A

  The example of Patent Document 1 relates to a projection device that projects an image on an electronic blackboard, and there is no suggestion or disclosure regarding an in-vehicle display device such as a display of a vehicle navigation device.

  In the example of Patent Document 2, a plurality of display units are required, and a drive mechanism is also required, which is not applicable to a conventional display device having only one display unit. In addition, manufacturing costs also increase.

  With the above problem as a background, an object of the present invention is to provide an in-vehicle display device that eliminates difficulty in seeing a display due to perspective.

Means for Solving the Problems and Effects of the Invention

  An in-vehicle display device for solving the above-mentioned problems is displayed on a display screen of a display device from a display device that is fixedly arranged to be shifted to the left or right with respect to the front direction of the seated user and the user's seat Image correction means for correcting an image so that an image area with a larger viewpoint distance in which a pixel of an image is viewed has a larger display magnification, and the image correction means is at least in the left-right direction of the display screen of the display The display enlargement ratio is increased as the viewpoint distance increases.

  The present invention solves the above problem by paying attention to the user's viewpoint and the display position of the display, and displaying the display content displayed on the map in a larger distance from the user. In the conventional display device, the display screen appears smaller as the viewpoint distance increases. However, with the above configuration, it is possible to eliminate the difficulty in viewing from the user to the display screen.

  In the in-vehicle display device of the present invention, the user is seated in the driver's seat, the display is disposed closer to the passenger seat with respect to the driver's seat, and the image correction means is closer to the passenger seat on the display screen of the display. It can also be configured to increase the display magnification.

  Since the display is often placed near the center console of the vehicle, the above configuration eliminates the difficulty of seeing the display screen from the perspective of the driver who frequently views the display screen. The resulting eye fatigue is also reduced, so the driving load is reduced and the user can concentrate on driving.

  The display in the in-vehicle display device of the present invention is a composite display capable of simultaneously displaying a first image and a second image on a common screen area in accordance with different viewing angles in two directions. In the first image visible from the driver's seat, the display enlargement ratio is increased as the passenger seat is approached, and in the second image visible from the passenger seat, the display enlargement ratio is increased as the driver seat is approached. It can also be configured.

  In recent years, composite displays, which are also called two-screen display displays, that can display different images according to the left and right viewing angles have become widespread (see Non-Patent Document 1). In this composite display, by adjusting the viewing angle, it is possible to enjoy different images from different viewing angles such as a driver's seat and a passenger seat of a vehicle, for example. With the above configuration, it is possible to eliminate the difficulty of seeing the display screen from both the driver and the passenger on the passenger seat.

ASCII24 News / Topics, April 20, 2005 "Display 2005 Report Vol.3" Different images on the driver's seat and front passenger seat are displayed in full screen !! Reference display with a two-screen display display "Search September 10, 2007 Internet <URL: http://ascii24.com/news/i/topi/article/2005/04/20/655512-000.html?geta>

  Moreover, the image correction means in the in-vehicle display device of the present invention can be configured to increase the display magnification rate as the viewpoint distance increases in the vertical direction of the display screen of the display.

  There are various angles at which the user looks at the display screen. Generally, the in-vehicle display device is disposed below the lower edge of the windshield so as not to hinder the driving vision. That is, a driver of a right-hand drive vehicle often sees a display screen on the lower left side of the driver. In this case, it is difficult to see from the perspective to the display screen in the vertical direction in addition to the horizontal direction. However, with the above configuration, it is possible to eliminate difficulty in seeing due to the distance to the display screen in the vertical direction.

  The in-vehicle display device of the present invention is configured to include viewpoint position acquisition means for acquiring the viewpoint position of the user and viewpoint distance calculation means for calculating the viewpoint distance based on the acquired viewpoint position of the user. You can also.

  Since the viewpoint distance can be calculated if the user's viewpoint position is known, the above-described configuration can correct the display magnification ratio of the image.

  Hereinafter, an in-vehicle display device of the present invention applied to a vehicle navigation device will be described as an example with reference to the drawings. Of course, the vehicle-mounted display device may be configured as an independent vehicle-mounted device different from the vehicle navigation device, or may be used for a display of a vehicle-mounted audio-visual device.

  FIG. 1 is a block diagram showing a configuration of a vehicle navigation device (hereinafter abbreviated as a navigation device) 100. The navigation device 100 includes a position detector 1, a map data input device 6, an operation switch group 7, a remote control (hereinafter referred to as remote control) sensor 11, a voice synthesis circuit 24 for performing voice guidance, a speaker 15 group, a memory 9, and a display. A device 10, a transceiver 13, a hard disk device (HDD) 21, a LAN (Local Area Network) I / F (interface) 26, a control circuit 8 connected thereto, a remote control terminal 12, and the like.

  The position detector 1 is a well-known geomagnetic sensor 2, a gyroscope 3 that detects the rotational angular velocity of the vehicle, a distance sensor 4 that detects the travel distance of the vehicle, and a GPS receiver that detects the position of the vehicle based on radio waves from a satellite. Machine 5 is provided. Since these sensors 2, 3, 4, and 5 have errors of different properties, they are configured to be used while being complemented by a plurality of sensors. Depending on the accuracy, some of the sensors described above may be used, and a steering rotation sensor such as a steering angle sensor (not shown), a wheel sensor for each rolling wheel such as a vehicle speed sensor 23, or the like may be used. May be.

  As the operation switch group 7, for example, a known touch panel 22 integrated with the display 10 or a mechanical switch is used. In addition to the mechanical switch, a pointing device such as a mouse or a cursor may be used.

  It is also possible to input various instructions using the microphone 31 and the voice recognition unit 30. In this method, a voice signal input from the microphone 31 is processed by a voice recognition technique such as a well-known hidden Markov model in the voice recognition unit 30, and converted into an operation command corresponding to the result. Various instructions can be input by the operation switch group 7, the remote control terminal 12, the touch panel 22, and the microphone 31 corresponding to the viewpoint position acquisition means of the present invention.

  The transceiver 13 is, for example, a VICS (Vehicle Information and Communication System: registered trademark) center 14 by an optical beacon or a radio beacon output from a transmitter (not shown) provided along the road. It is a device for receiving road traffic information from or receiving FM multiplex broadcasting. Moreover, it is good also as a structure which can be connected to external networks, such as the internet, using the transmitter / receiver 13. FIG.

  The control circuit 8 includes a well-known CPU 81, ROM 82, RAM 83, I / O 84 which is an input / output circuit, an A / D conversion unit 86, a drawing unit 87, an image processing unit 89, and a bus line 85 which connects these configurations. It has been. The CPU 81 controls the navigation program 21p and data stored in the HDD 21. The CPU 81 controls the reading / writing of data to / from the HDD 21. In addition, a program for performing a minimum necessary operation as the navigation device 100 may be stored in the ROM 82 in a case where the data read / write control from the CPU 81 to the HDD 21 becomes impossible. The control circuit 8 corresponds to the image correction means and viewpoint distance calculation means of the present invention.

  The A / D conversion unit 86 includes a well-known A / D (analog / digital) conversion circuit, and converts analog data input from the position detector 1 or the like to the control circuit 8 into digital data that can be calculated by the CPU 81, for example. It is.

  The drawing unit 87 generates display screen data to be displayed on the display 10 from road map data 21m (described later), display data, and display color data stored in the HDD 21 or the like.

  The image processing unit 89 includes an image processing circuit that analyzes an image photographed by the in-vehicle camera 32 (described later) by a known technique such as pattern recognition. In the image processing unit 89, for example, a general binarization process is performed on the video signal captured by the in-vehicle camera 32 to convert the image signal into digital multi-valued image data for each pixel. Then, a desired image portion is extracted from the obtained multi-value image data using a general image processing method.

  In addition to the navigation program 21p, the HDD 21 stores so-called map matching data for improving the accuracy of position detection and road map data 21m, which is a map database including road data representing road connections. The road map data 21m stores predetermined map image information for display and road network information including link information and node information. The link information is predetermined section information constituting each road, and includes position coordinates, distance, required time, road width, number of lanes, speed limit, and the like. The node information is information defining an intersection (branch road) or the like, and is composed of position coordinates, the number of right / left turn lanes, a connection destination road link, and the like. In addition, data indicating whether or not traffic is possible is set in the inter-link connection information.

  In addition, in the HDD 21, auxiliary information for route guidance, entertainment information, and other data can be written independently by the user and stored as user data 21u. Data and various information necessary for the operation of the navigation device 100 are also stored as the database 21d.

  The navigation program 21p, road map data 21m, user data 21u, and database 21d can be added / updated from the storage medium 20 via the map data input device 6. The storage medium 20 is generally a CD-ROM or DVD based on the amount of data, but may be another medium such as a memory card. Moreover, you may use the structure which downloads data via an external network.

  The memory 9 is composed of a rewritable device such as an EEPROM (Electrically Erasable & Programmable Read Only Memory) or a flash memory, and stores information and data necessary for the operation of the navigation apparatus 100. Has been. The memory 9 holds the stored contents even when the navigation device 100 is turned off. Further, necessary information and data may be stored separately in the memory 9 and the HDD 21 according to the function or operation of the navigation device 100.

  The display 10 is composed of a known color liquid crystal display, and includes a dot matrix LCD (Liquid Crystal Display) and a driver circuit (not shown) for performing LCD display control. The driver circuit uses, for example, an active matrix driving method in which a transistor is attached to each pixel so that the target pixel can be reliably turned on and off, and a display command sent from the control circuit 8 (drawing unit 87) and Display is performed based on the display screen data. Further, an organic EL (ElectroLuminescence) display or a plasma display may be used as the display 10.

  In addition, as shown in FIG. 2, the display device 10 is arranged at the center console and the center of the dash panel in the vehicle interior so that both the driver and the passenger on the passenger seat can see and operate.

  Returning to FIG. 1, the speaker group 15 is connected to a known voice synthesis circuit 24, and digital voice data stored in the memory 9 or the HDD 21 is converted into analog voice by the voice synthesis circuit 24 according to a command of the navigation program 21 p. Sent out. Note that speech synthesis methods include a recording / editing method in which speech waveforms are stored as they are or after being encoded and connected as necessary, and a text synthesis method in which corresponding speech is synthesized from character input information.

  The vehicle speed sensor 23 includes a rotation detection unit such as a known rotary encoder. For example, the vehicle speed sensor 23 is installed in the vicinity of the wheel mounting unit to detect the rotation of the wheel and send it to the control circuit 8 as a pulse signal. In addition to converting the number of rotations of the wheel into the speed of the vehicle, the control circuit 8 calculates an estimated arrival time from the current position of the vehicle to a predetermined location, or calculates an average vehicle speed for each travel section of the vehicle.

  The LAN I / F 26 is an interface circuit for exchanging data with other in-vehicle devices and sensors via the in-vehicle LAN 27. Further, data may be taken from the vehicle speed sensor 23 or the like via the LAN I / F 26.

  With this configuration, the navigation device 100 allows the user to operate the operation switch group 7, the touch panel 22, the remote control terminal 12, or from the microphone 31 when the navigation program 21 p is activated by the CPU 81 of the control circuit 8. When a route guidance process for displaying a destination route on the display 10 is selected from a menu (not shown) displayed on the display 10 by voice input, the following process is performed.

  That is, when the user searches for a destination and the destination is set, the current position of the vehicle is obtained by the position detector 1, and a process for obtaining an optimum guide route from the current position to the destination is performed. Done. Then, the guidance route is displayed on the road map on the display 10 so as to guide the user to the appropriate route. As a method for automatically setting an optimum guide route, a method such as the Dijkstra method is known. Further, at least one of the display device 10 and the speaker 15 group notifies the user of a message corresponding to the guidance during operation and the operating state.

  The in-vehicle camera 32 includes a well-known CCD camera or the like, and is used for photographing the interior of the vehicle. As shown in FIG. 2, the in-vehicle camera 32 is installed, for example, in the vicinity of the attachment portion of the rearview mirror 38 so that at least the head of the driver and passenger seat and the display device 10 can be photographed. The in-vehicle camera 32 corresponds to the viewpoint position acquisition unit of the present invention.

  As the display device 10, a composite display device that is also referred to as a two-screen display display that can display different images according to the left and right viewing angles may be used. An example of the configuration will be described with reference to FIGS. 3 and 4 using a known 3D display as an example. 3 and 4 are schematic views of the display device 10 as viewed from above. The 3D display uses a lenticular technique that uses parallax, which is a shift when the same thing is viewed from the same place with one eye, and makes a planar printed matter appear to be three-dimensional or moving. First, as shown in FIG. 3, the video A that can be viewed from the two different directions A and the video B that can be viewed from the B direction are each divided into strips in the vertical direction of the screen, and combined alternately. An image recombined into one image is created on the LCD 10c.

  Then, as shown in FIG. 4, the image is displayed through a vertically long lenticular lens sheet 10 d attached to the entire surface of the LCD and having a bowl-like cross section. By adjusting the curvature of the lens of the lenticular lens sheet 10d, only the video A that is the first image of the present invention is displayed on the driver seat side display screen 10a that can be viewed from the A direction, that is, from the driver seat side. Further, only the video B which is the second image of the present invention is displayed on the passenger seat side display screen 10b which can be viewed from the B direction, that is, the passenger seat side. And the audio | voice corresponding to these display screens (10a, 10b) is sent out from a speaker group (15a, 15b).

  In addition to the above method, a method of performing two-screen display by controlling the illumination direction of the backlight corresponding to the viewing angles in the A direction and the B direction may be used. Video A and video B may be either still images or moving images. In addition, as for the video A and the video B, the same video may be displayed or different videos may be displayed.

  The image correction display process will be described with reference to FIG. This process is included in the navigation program 21p and is repeatedly executed together with other processes included in the navigation program 21p. In addition, this processing illustrates correction / display of an image visually recognized by the driver. However, when a composite display is used, an image visually recognized by a passenger on the passenger seat is also corrected.

First, the viewpoint position of the driver is acquired (S11). Any of the following methods may be used as the method for acquiring the viewpoint position.
A viewpoint position setting input screen (not shown) is selected and displayed from the menu screen of the display 10 by an input operation using the operation switch group 7 and the like, and the driver's viewpoint position is input. For example, a three-side view of the passenger compartment around the driver's seat is displayed on the display 10 and the viewpoint position is set with a pointing device. Then, based on the setting result, the viewpoint position is obtained as spatial coordinates with a predetermined point as a reference point.
-A driver's face image is extracted from the image taken by the in-vehicle camera 32 using a known image processing technique, and the eye position (viewpoint position) from the face image, for example, the installation position of the in-vehicle camera 32 is used as a reference. Acquired as a spatial coordinate as a point. Since the mounting position and shooting range of the in-vehicle camera 32 are known values for each vehicle, the viewpoint position can be acquired.

  As shown in FIG. 6, the distance from the in-vehicle camera 32 to the headrest 41c based on the position xa, ya, za after adjustment of the driver's seat (hereinafter abbreviated as a seat) by the driver and the inclination θb of the backrest 41b. Can be requested. Here, xa is the distance of the seat seating portion 41a at the end where the backrest portion 41b is attached, for example, the distance relative to the position behind the seat, such as the position where the seat is fully moved rearward. expressed. For example, ya is expressed as a distance from the center line in the front-rear direction of the vehicle to the center line in the front-rear direction of the seat, and is generally a fixed value (seat attachment position). za represents the position of the seat seating portion 41a as a distance from the height position of the in-vehicle camera 32. θb is an inclination angle of the backrest 41b with respect to the vertical direction of the seat. In addition, the steering wheel is shown as 35. Further, θa is a driver's viewpoint position detection angle (a depression angle viewed from the in-vehicle camera 37).

  When the distance from the in-vehicle camera 32 (xb, yb, zb) to the headrest 41c is obtained, the center position of the headrest 41c can be expressed as three-dimensional coordinates. If the size of the driver's head is the average value for adults and the positional relationship between the headrest 41c and the driver's head is standard, the driver's eye position (viewpoint position) can be obtained as coordinates. it can.

  "Safety training: Correct driving attitude (URL: http://www.jaf.or.jp/safety/index.htm)", June 2007 on traffic safety on the homepage of JAF (Japan Automobile Federation) “20-day search” describes that “the line connecting the (driver's) eyes and ears is ideally in the center of the headrest”. In addition, as a result of recent automobile safety research, it was pointed out that it is important that the distance between the headrest and head is kept below 4 cm during driving, in order to effectively mitigate the impact of a collision. Therefore, the positional relationship (distance) between the headrest 41c and the driver's head can be set to 4 cm.

  Returning to FIG. 5, the viewpoint distance to the display screen of the display 10 is calculated based on the viewpoint position acquired above (S12). That is, the spatial coordinates of the four corner points or the center point of the display screen of the display 10 are obtained, and the viewpoint distance is calculated based on these coordinates and the coordinates of the viewpoint position.

  Next, the display image is corrected (S13, described later). Finally, the corrected display image is displayed on the display screen of the display 10 (S14).

  The concept of display image correction will be described with reference to FIGS. 7A to 7C and FIGS. 8A and 8B. When the display screen of the display 10 is viewed from the front, the appearance (the shape of the actual display image visually recognized by the user) is as shown in FIG. 7B. However, when the display 10 is arranged as shown in FIG. 2, the shape of the display image visually recognized by the driver is as shown in FIG. 7, and the image becomes smaller as it approaches the passenger seat side. Therefore, as shown in FIG. 7C, the display image is corrected so that the display image can be visually recognized from the driver's seat in the shape as shown in FIG.

  As shown in FIG. 8A, since the display image (200) is closer to the front passenger seat, the display image appears to be narrower than the reference width in the appearance that the user wants to show (201). Correction is performed so that the width becomes wider than the reference width (202). Further, as shown in FIG. 8B, the display image (300) also appears in the vertical direction closer to the passenger seat because the display image appears narrower than the reference width for the appearance that the user wants to show (301: I). In order to make it closer, correction is performed so as to be wider than the reference width (302: II).

Details of the image correction performed in step S13 in FIG. 5 will be described with reference to FIGS. 9A and 9B. First, a method for calculating the ratio of the shape of an image to be displayed will be described with reference to FIG. 9A. FIG. 9A shows a view of the display screen of the display 10 (shown as a display surface in FIG. 9A) viewed from above and a view viewed from the front. The length of the left and right sides BF and EA of the display surface ABFE is d1, and the length of the vertical sides AB and FE is d2. Also, the distance from the driver's viewpoint position (indicated as viewpoint in FIG. 9A) O to the vertices A and B of the display screen is a, the distance from the viewpoint O to the vertices F and E of the display screen is b, and the line segment OA An angle formed by the line segment OE (or the line segment OB and the line segment OF) is defined as θ. At this time, since there is a relationship of d1 ² = a ² + b ² −2ab cos θ, it is expressed as cos θ = (d1 ² −a ² −b ² ) / (− 2ab).

  In addition, the image actually viewed by the driver (shown as a virtual image that can be seen in FIG. 9A) includes points D and C and vertices A and B whose distance from the viewpoint O is a in the line segment OF and the line segment OE. It is represented by the connected plane ABDC.

The shape of the image to be displayed is obtained by connecting points H and G and vertices A and B obtained by extending the line segment OF and the line segment OE by the lengths of the line segment DF and the line segment CE (both are ba). It is represented as a flat plane ABHG. At this time, the length of the sides BH and GA is x1, and the length of the side HG is x2. At this time,
x1 ² = a ² + {b + (b−a)} ² −2a {b + (b−a)} cos θ
When substituting the cos θ obtained above,
x1 ² = a ² + (2b−a) ² + {(2b−a) (d1 ² −a ² −b ² )} / b
And x1 is expressed as the following Equation 1.

From the relationship of b: d2 = {b + (ba)}: x2, x2 is expressed as follows.
x2 = {d2 (b + ba)} / b

  Next, with reference to FIG. 9B, a method for converting the ratio of the shape of the image desired to be obtained as described above into a display size that is actually displayed on the display 10 will be described. When the length x2 of the side HG calculated above is smaller than the length d2 of the sides AB and FE in the vertical direction of the display screen of the display device 10, the image is displayed with the dimension of the plane ABHG. That is, as the side AB approaches the side HG, the enlargement ratio of the image increases.

On the other hand, when x2 exceeds d2, the image is displayed with the dimension of the plane A′B′BA reduced so as to satisfy x2 = d2 so that the display image fits on the display screen of the display 10. If the length of the side A′B ′ is x, from the relationship of x2: d2 = d2: x,
It is calculated as x = d2 ² / x2.

  If the intersection of the line segment GA ′ extending in the A ′ direction and the line segment HB ′ extending in the B ′ direction is K and the length of the line segment AK is x4, x2: (x1 + x4) = D2: Since there is a relationship of x4, it is calculated as x4 = d2x1 / (x2-d2).

  Further, if the length of the line segment AA ′ is x3, there is a relationship of d2: x4 = x: (x4−x3), so that the calculation is performed as x3 = x4 (d2−x) / d2. Thereby, the shape and size of the display image displayed on the display screen of the display 10 can be calculated.

  In the above example, the driver is taken as an example, but the shape and size of the display image can be calculated by the same method for the passenger on the passenger seat. In the above example, the driver's viewpoint position (eye height) and the position of the display screen display position of the display 10 are substantially the same. And the height of the display screen arrangement position of the display 10 is different based on the concept shown in FIGS. 7A to 7B and FIGS. 8A and 8B. Etc. are expressed using spatial coordinates (X, Y, Z), and the shape and size of the display image can be calculated by using the above-described method for the plane of each coordinate system.

  A screen display example on the display 10 of the vehicle navigation apparatus 100 will be described with reference to FIGS. 10 and 11. As shown in FIG. 10, in the conventional method, even if an image is displayed in a substantially rectangular shape on the display device 10, it becomes difficult for the driver to see the image because it is displayed smaller as it approaches the passenger seat. On the other hand, as shown in FIG. 11, in the configuration of the present invention, the display 10 is displayed larger as it approaches the passenger seat, so that the smaller the closer to the passenger seat is corrected, and the display is displayed in a substantially rectangular shape for the driver. Is done.

When displaying map data etc. on the display screen of the display 10 with the structure of this invention, it is good also as the following display forms.
-The road displayed on the map is thickened away from the user.
-Increase the display area of the operation buttons on the touch panel to keep away from the user. Alternatively, the operation buttons on the touch panel have the same size regardless of the button position.
・ If the display area of the operation buttons on the touch panel is increased as the user moves away from the user, the front operation buttons become smaller and difficult to press. It is determined that the operation button was pressed when it was pressed).

-The balance between the vertical and horizontal display sizes for increasing the information by the user's operation can be changed by the user's operation. Based on the viewpoint position of the user and the installation position of the display 10, the state may be automatically changed to a predetermined state.
-Since the character display overlaps with the distance from the user and the character display becomes larger, the display amount is adjusted (omitted) as the distance increases. For example, the display amount is the amount when the map is scaled up (wide area).
・ Increase the display step by step as you go further.
・ Smoothly enlarge the display as the distance increases.

・ Change the shape of the display device. A mechanism for changing the shape of the display screen is provided, and the shape of the display screen is changed based on the viewpoint position of the user and the installation position of the display 10.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these embodiments, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

The block diagram which shows the structure of the navigation apparatus for vehicles. The figure which shows the example of installation of a display and a vehicle camera. The figure which shows the structural example of a composite display. The figure which shows the structural example of a composite display following FIG. The flowchart explaining an image correction display process. The figure explaining a viewpoint position acquisition method. The figure explaining the concept of correction | amendment of a display image. The figure explaining the concept of correction | amendment of a display image following FIG. 7A. The figure explaining the concept of correction | amendment of a display image following FIG. 7B. The figure explaining the concept of the correction | amendment of the left-right direction of a display image. The figure explaining the concept of the correction | amendment of the up-down direction of a display image. The figure explaining the detail of image correction. The figure explaining the detail of image correction following FIG. 9A. The figure which shows the example of a screen display by a conventional structure. The figure which shows the example of a screen display by the structure of this invention.

Explanation of symbols

7 Operation switch group (viewpoint position acquisition means)
8 Control circuit (image correction means, viewpoint distance calculation means)
10 Display Unit 15 Speaker Group 21 Hard Disk Drive (HDD)
21p navigation program 22 touch panel (viewpoint position acquisition means)
30 Voice recognition unit 31 Microphone (viewpoint position acquisition means)
32 Vehicle camera (viewpoint position acquisition means)
100 Vehicle navigation device

Claims (5)

A display device fixedly arranged to be deviated left or right with respect to the front direction of the seated user;
An image correction unit that corrects the image so that a display magnification ratio increases from an image region having a larger viewpoint distance from which a pixel of an image displayed on the display screen of the display unit is viewed from the user's seat;
With
The vehicle-mounted display device, wherein the image correction means increases the display magnification rate as the viewpoint distance increases at least in the left-right direction of the display screen of the display. The user is seated in the driver's seat,
The indicator is disposed closer to the passenger seat with respect to the driver seat,
The on-vehicle display device according to claim 1, wherein the image correction unit increases the display magnification rate as the distance from the front passenger seat approaches the display screen of the display device. The display is a composite display capable of simultaneously displaying a first image and a second image on a common screen area according to different viewing angles in two directions,
The image correction means increases the display enlargement ratio as it approaches the front passenger seat in the first image visible from the driver seat, and approaches the driver seat in the second image visible from the front passenger seat. The in-vehicle display device according to claim 2, wherein the display enlargement ratio is increased.   The in-vehicle display device according to any one of claims 1 to 3, wherein the image correction unit increases the display magnification rate as the viewpoint distance increases in a vertical direction of a display screen of the display. Viewpoint position acquisition means for acquiring the user's viewpoint position;
Viewpoint distance calculation means for calculating the viewpoint distance based on the acquired viewpoint position of the user;
The in-vehicle display device according to any one of claims 1 to 4, further comprising: