JP2004104421A - Display system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate adjustment for the optical axis in a display system for a vehicle. <P>SOLUTION: The display system for a vehicle is provided with an infrared camera 10 having a CCD element 12 for converting video images in front of a vehicle to electric signals and a DSP 13 for generating video signals on the basis of the electric signals, a head-up display 20 having a liquid crystal panel 21 to display the video images on the basis of the video signals, and an operating switch 30 for setting the location of the optical axis of the video images to the liquid crystal panel 21. The DSP 13 generates the video signals by deviating the timing of at least one of the synchronizing signals between the horizontal synchronizing signal and the vertical synchronizing signal included in the video signals corresponding to the location of the optical axis set by the operating switch 30. By this, the adjustment of the optical axis can be easily executed without requiring a preset counter required in the preceding application. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle display system that assists safe driving by assisting a driver's view at night by capturing an image in front of a vehicle with a vehicle-mounted night-vision camera and displaying the image on a vehicle-mounted display device. It is.
[0002]
[Prior art]
Conventionally, when the vehicle is driving at night, it is difficult for the driver to visually recognize a distant place (for example, about 100 m to 400 m ahead of the vehicle) and a dark place in front of the vehicle that the headlight does not reach, Such poor visibility caused a traffic accident.
[0003]
Therefore, in recent years, the above-described image of a place with poor visibility is captured by an in-vehicle night-vision camera and displayed on an in-vehicle display device, thereby assisting the driver's visibility at night to support safe driving. A display system for a vehicle has been proposed.
[0004]
In such a display system, it is required that the driver can perform optical axis adjustment for adjusting which image of the image in front of the vehicle is to be displayed on the display device. The night vision camera itself arranged in the vicinity of the rearview mirror is mechanically moved by a screw or the like so that the driver adjusts the optical axis.
[0005]
[Problems to be solved by the invention]
However, the workability of the adjustment is poor in the optical axis adjustment using such mechanical adjustment means as a screw. For example, the workability is poor when making fine adjustments such as slightly shifting the optical axis position. In particular, the vertical adjustment of the optical axis adjustment is performed by slightly moving the vertical position of the night vision camera. Since the far and near positions of the image to be displayed greatly change, fine optical axis adjustment is required, and such an optical axis adjustment requires more difficult work.
[0006]
In view of the above, an object of the present invention is to make it possible to easily adjust an optical axis in a vehicle display system. It is another object of the present invention to effectively display an image ahead of the vehicle when traveling on a curve.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, an imaging unit (12) for converting an image in front of the vehicle into an electric signal and a video signal generating unit (13) for generating a video signal based on the electric signal are provided. Vehicle-mounted night-vision camera (10), a vehicle-mounted display device (20) having a display unit (21) for displaying an image based on a video signal, and an operation switch for setting an optical axis position of the image with respect to the display unit (21) Means (30),
The video signal generating means (13) shifts the timing of at least one of the horizontal synchronizing signal and the vertical synchronizing signal included in the video signal in accordance with the optical axis position set by the operation switch means (30). , And a video signal.
[0008]
Here, the general correspondence between the video and the video signal displayed on the display unit (21) will be described with reference to FIGS. 5 and 6. The range surrounded by the dashed line P in FIG. A range displayed by the section (21) is shown, and a range surrounded by a solid line Q indicates a range of a video signal S, a video signal including a horizontal blanking period H and a vertical blanking period V, and is surrounded by a solid line R. The range indicated by the dotted line indicates a range corresponding to the video signal S in the video signal.
[0009]
The oblique line in the range R corresponding to the video signal S indicates a black video portion, and in the example of FIG. 5, a white circular video with the black portion as a background is displayed. Then, a vertical synchronizing signal (see each symbol a in FIG. 6) is input at 60 Hz to the in-vehicle display device (20), and a horizontal synchronizing signal (see each symbol b in FIG. 6). When the signals are sequentially input between the falling edges of both vertical synchronization signals at 7 kHz, the in-vehicle display device (20) displays a white circular image with the above-described black portion as a background on the display unit (21). .
[0010]
Generally, the range R corresponding to the video signal S is set to be larger than the range P displayed on the display unit (21), and a predetermined position in the range R corresponding to the video signal S is determined. Are displayed on the display section (21).
[0011]
Here, the display position of the white circular image in the vertical direction with the black portion as the background on the display unit (21) is determined by the number of times of input of the horizontal synchronization signal after the input of the vertical synchronization signal. For example, as shown in FIG. 5, when the two horizontal synchronizing signals b are successively input, the video portion along the horizontal line A in the video signal S is displayed for the preceding horizontal synchronizing signal b, and For the horizontal synchronizing signal b, an image portion along the horizontal line B of the image signal S is displayed.
[0012]
Therefore, if the input timing of the vertical synchronizing signal is shifted, the position of the range R of the video signal S with respect to the range Q of the video signal is shifted vertically. Therefore, the vertical position of the white circular image with the black portion as a background with respect to the display unit (21) is shifted according to the input timing of the vertical synchronization signal.
[0013]
Similarly, if the input timing of the horizontal synchronization signal is shifted, the position of the range R of the video signal S with respect to the range Q of the video signal is shifted in the left-right direction. Therefore, the horizontal position of the white circular image with the black portion as a background with respect to the display section (21) is shifted according to the input timing of the horizontal synchronization signal.
[0014]
According to the first aspect of the present invention, the timing of at least one of the horizontal synchronizing signal and the vertical synchronizing signal included in the video signal is shifted according to the set optical axis position, and the video signal is shifted. Since the signal is generated, the image displayed on the display unit (21) can be displayed shifted in at least one of the vertical direction and the horizontal direction. Therefore, the optical axis can be electrically adjusted only by operating the operation switch means (30), and the optical axis can be easily adjusted.
[0015]
The inventor has already filed a Japanese Patent Application No. 2001-317024 as a display system for a vehicle that enables electrical adjustment of the optical axis. However, the display system of the prior application requires a preset counter. As a result, the cost is greatly increased.
[0016]
On the other hand, according to the first aspect of the present invention, the optical axis set by the operation switch means (30) by the existing video signal generation means (13) provided in the on-vehicle night vision camera (10). Since the video signal is generated by shifting the timing of the synchronization signal according to the position, the optical axis adjustment can be performed electrically without the need for the preset counter required in the above-mentioned prior application. And cost increase can be suppressed.
[0017]
Further, specific examples of the video signal generating means (13) include any one of a digital signal processor and a microcomputer as in the invention described in claim 3.
[0018]
The in-vehicle display device (20) includes a display device provided on an instrument panel of a vehicle, and the in-vehicle display device (20) is configured to be mounted on a front window of the vehicle. In the case of a head-up display device that displays an image as a virtual image on the shield (1), it is preferable to employ the vehicle display system according to any one of claims 1 to 3.
[0019]
According to the second aspect of the present invention, an in-vehicle night-vision camera (10) having an imaging unit (12) for converting an image in front of the vehicle into an electric signal and a video signal generating unit (13) for generating a video signal based on the electric signal. ), And an in-vehicle display device (20) having a display unit (21) for displaying an image based on a video signal,
The optical axis position of the image with respect to the display unit (21) when the vehicle is traveling straight ahead is defined as the optical axis position at the time of straight traveling, and the optical axis position of the image with respect to the display unit (21) when the vehicle is traveling curved is the light at the time of curve. Axis position,
The video signal generating means (13) generates a video signal by shifting the timing of the horizontal synchronizing signal included in the video signal so that the optical axis position at the time of curve is shifted to the curved side from the optical axis position at the time of straight travel. It is characterized by making it.
[0020]
Thus, when traveling on a curve, the image displayed on the display unit (21) can be shifted to the curve side and displayed, so that the image in front of the vehicle when traveling on a curve can be displayed effectively.
[0021]
It should be noted that reference numerals in parentheses of the above-described units are examples showing the correspondence with specific units described in the embodiments described later.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0023]
FIG. 1 is a cross-sectional view schematically showing a state in which the vehicle display system of the present embodiment is mounted on a vehicle, and FIG. 2 is a block diagram of the vehicle display system. This display system includes an infrared camera 10 as a vehicle-mounted night-vision camera, a head-up display 20 as a vehicle-mounted display device, operation switch means 30, and a steering angle sensor 40 for detecting a steering wheel steering angle.
[0024]
The operation switch 30 is a switch for setting an optical axis position of an image with respect to a display screen 21a, which will be described later, of the head-up display 20. In the present embodiment, a self-returning normally-open switch is employed. The operation switch 30 is provided in the vicinity of the driver's seat in the vehicle compartment, for example, in a portion of the inner wall of the driver's seat door that is easily accessible by the driver. The operation switch 30 is turned on by the on operation, and is turned off by releasing the on operation.
[0025]
The infrared camera 10 is supported near the upper edge of the front windshield 1 in the vehicle interior, and photographs the front of the passenger car through the front windshield 1. The telephoto lens 11, the imaging means 12, and the video signal generation means 13 , Interfaces 14 and 15.
[0026]
The imaging unit 12 is, specifically, a charge-coupled device (hereinafter, referred to as a CCD device) that converts an image in front of the vehicle into an electric signal. Specifically, the video signal generating means 13 generates a video signal to which a vertical synchronizing signal, a horizontal synchronizing signal, a burst signal, and the like are added based on the electric signal converted by the CCD element 12. DSP). The video signal of the present embodiment is based on the well-known NTSC system.
[0027]
An optical axis position signal from a microcomputer 23 to be described later is input to the DSP 13 through the interface 14, and the timing of at least one of the horizontal synchronizing signal and the vertical synchronizing signal included in the video signal is adjusted by the optical axis. The video signal is generated by shifting according to the position signal.
[0028]
Note that the DSP 13 also performs processing for controlling the timing of reading out the charge of the CCD element 12 and the like, well-known automatic gain processing, and the like.
[0029]
The head-up display 20 is provided on an instrument panel 2 extending downward from the lower edge of the front windshield 1 toward the interior of the vehicle compartment, and includes a display device D and a control circuit E.
[0030]
The display device D has a TFT type liquid crystal panel 21 and a backlight 22 as a display unit. As shown in FIG. 1, the liquid crystal panel 21 is provided in an opening 2b of an upper wall 2a of the instrument panel 2. It is supported horizontally. The liquid crystal panel 21 receives light from the backlight 22, is driven as described later, and displays a display image on the display screen 21a.
[0031]
The display light of this display image enters the front windshield 1 and is reflected by the front windshield 1 along the broken line R shown in FIG. 1 toward the eye of the driver M sitting in the driver's seat of the passenger car. Accordingly, an image is formed as a virtual image m in front of the front windshield 1.
[0032]
The backlight 22 is supported on the back side of the liquid crystal panel 21, and the backlight 22 emits light to the liquid crystal panel 21 from the back side by lighting. The display device D drives the liquid crystal panel 21 by a matrix driving circuit (not shown) as described later.
[0033]
The control circuit E is connected between the operation switch 30, the steering angle sensor 40, and the infrared camera 10 and the display device D as shown in FIG. The control circuit E includes a microcomputer 23, a power supply circuit 24, a video signal processing circuit 25, a timing controller 26, and an electrode drive circuit 27.
[0034]
The microcomputer 23 has interfaces 23a and 23b and a nonvolatile memory 23c. Each time the operation switch 30 is turned on, the microcomputer 23 is sequentially input as an operation output via the interface 23a. Then, the number of the operation outputs (that is, the number of times the operation switch 30 is turned on) is calculated as a preset counter value, and the amount of shifting the optical axis position in the vertical direction is calculated according to the preset counter value.
[0035]
Further, a detection value from the steering angle sensor 40 is input to the microcomputer 23 via the interface 23a. Then, an amount of shifting the optical axis position in the left-right direction is calculated according to the detected steering angle.
[0036]
Then, the optical axis position is determined based on the optical axis position calculated according to the preset counter value and the optical axis position calculated according to the steering angle detection value, and information on the determined optical axis position is included. The signal is output to the infrared camera 10 via the interface 23b.
[0037]
The video signal processing circuit 25 is supplied with a DC voltage from the power supply circuit 24 and outputs the video signal Vde of the NTSC system or the like input from the infrared camera 10 to the display device D as it is. Further, the video signal processing circuit 25 sequentially forms a composite synchronization signal CSYNC based on the video signal from the infrared camera 10 and outputs the composite synchronization signal CSYNC to the timing controller 26.
[0038]
Further, the video signal processing circuit 25 alternately forms a common voltage for preventing image sticking of the liquid crystal panel 21 in accordance with the video signal from the infrared camera 10 based on the DC voltage from the power supply circuit 24 and outputs the common voltage to the display device D. . The power supply circuit 24 generates a DC voltage and outputs the DC voltage to the video signal processing circuit 25 and the timing controller 26.
[0039]
The timing controller 26 sequentially forms a vertical synchronizing signal VSY having a frequency of 60 Hz and a horizontal synchronizing signal HSY having a frequency of 15.7 kHz based on the composite synchronizing signal CSYNC sequentially generated from the video signal processing circuit 25 and inputs the same to the video signal processing circuit 25. . The vertical synchronizing signal VSY and the horizontal synchronizing signal HSY input to the video signal processing circuit 25 are used for forming the next composite synchronizing signal CSYNC in the video signal processing circuit 25 based on the video signal from the infrared camera 10. Further, the timing controller 26 sequentially outputs the horizontal start pulse signal Hst and the vertical start pulse signal Vst to the display device D together with the sampling clock C based on the sequentially formed horizontal synchronizing signal HSY and vertical synchronizing signal VSY.
[0040]
In the present embodiment, the preset counter value of the operation switch 30 is 10, and therefore, every time the operation switch 30 is turned on once, the number of horizontal synchronization signals HSY is shifted by 10. That is, the fall of the vertical start pulse signal Vst is delayed from the fall of the vertical synchronization signal VSY by a period sum of ten horizontal synchronization signals HSY (see FIG. 3).
[0041]
When the display device D receives the vertical start pulse signal Vst from the timing controller 26 in the matrix driving circuit, the display device D sequentially outputs the sampling start clock C together with the sampling clock C after the falling of the vertical start pulse signal Vst (see FIG. 3). The horizontal start pulse signal Hst (corresponding to the horizontal synchronization signal HSY) is received. The display device D uses the matrix drive circuit to synchronize with each of the horizontal start pulse signals Hst with the fall of the vertical start pulse signal Vst and to display the display screen 21a of the liquid crystal panel 21 in FIG. The liquid crystal panel 21 is driven to display according to the video signal Vde while sequentially scanning from left to right from the side horizontal line to the bottom horizontal line.
[0042]
In the present embodiment configured as described above, it is assumed that the vehicle is traveling along the road under the driving operation of the driver. In such a state, the infrared camera 10 converts an image ahead of the vehicle into an electric signal by the CCD element 12 through the telephoto lens 11 and generates a video signal based on the electric signal by the DSP 13.
[0043]
Next, the video signal processing circuit 25 outputs the video signal from the infrared camera 10 to the display device D as it is while receiving the DC voltage from the power supply circuit 24. Further, the video signal processing circuit 25 sequentially forms a composite synchronization signal CSYNC based on the video signal from the infrared camera 10 and outputs the composite synchronization signal CSYNC to the timing controller 26. Further, the video signal processing circuit 25 alternately forms a common voltage for preventing image sticking of the liquid crystal panel 21 in accordance with the video signal from the infrared camera 10 based on the DC voltage from the power supply circuit 24 and outputs the common voltage to the display device D. .
[0044]
Then, the timing controller 26 receives the DC voltage from the power supply circuit 24 and sequentially receives the vertical synchronizing signal VSY having the frequency of 60 Hz and the vertical synchronizing signal VSY having the frequency of 15.7 kHz based on the composite synchronizing signal CSYNC sequentially generated from the video signal processing circuit 25. A horizontal synchronizing signal HSY is formed and input to the video signal processing circuit 25. Further, the timing controller 26 sequentially outputs the horizontal start pulse signal Hst and the vertical start pulse signal Vst to the display device D together with the sampling clock C based on the sequentially formed horizontal synchronizing signal HSY.
[0045]
At this stage, if the preset counter value of the operation switch 30 is zero and the value detected by the steering angle sensor 40 is 0 degree (straight running), the DSP 13 of the infrared camera 10 will be shown in FIG. As described above, the video signal is generated based on the electric signal generated by the CCD element 12 so that the range R corresponding to the video signal S is located substantially at the center of the range Q of the video signal.
[0046]
In the display device D, the liquid crystal panel 21 causes the matrix drive circuit to output a horizontal start pulse sequentially output together with the sampling clock C from the timing controller 26 every time the vertical start pulse signal Vst from the preset counter 130 falls. In response to the signal Hst, the video signal Vde is input from the video signal processing circuit 25 to display an image. This image display is performed by displaying a white circular image with a black portion as a background on the display screen 21a of the liquid crystal panel 21, as shown in FIG.
[0047]
Here, when the lower part of the display image on the display screen 21a is in a state that is difficult for the driver to see, the driver repeats the ON operation of the operation switch 30 ten times, for example. Then, each ON operation output of the operation switch 30 is sequentially input to the microcomputer 23 via the interface 23a. Accordingly, the microcomputer 23 uses the number of ON operation outputs of the operation switch 30 as a preset counter value, and calculates an amount of shifting the optical axis position in the vertical direction according to the preset counter value.
[0048]
When the vehicle is traveling on a curve by operating the steering wheel, the steering angle detected by the steering angle sensor 40 is sequentially input to the microcomputer 23 via the interface 23a. Along with this, the microcomputer 23 calculates the amount of shifting the optical axis position at the time of curve toward the curve side from the optical axis position at the time of straight traveling according to the steering angle detection value.
[0049]
The microcomputer 23 determines the amount of shift of the optical axis position calculated in accordance with the operation of the operation switch 30 and the amount of shift of the optical axis position calculated in accordance with the detected steering angle value with the interface 23b and the interface 14. To the DSP 13 via the.
[0050]
Then, when generating the video signal, the DSP 13 adds the vertical synchronizing signal VSY and the horizontal synchronizing signal HSY to the video signal based on the above-described shift amount of the optical axis position. More specifically, the timing at which the DSP 13 applies the vertical synchronization signal VSY to the video signal is shifted in accordance with the amount set by the operation switch 30. The DSP 13 shifts the timing of applying the horizontal synchronization signal HSY to the video signal in accordance with the detected steering angle.
[0051]
FIG. 4A is a diagram showing a video signal when the vehicle is traveling straight and the number of times of operation of the operation switch 30 is zero, and FIG. 4B is a diagram showing a video signal when the vehicle is traveling straight and the number of operations of the operation switch 30 is one. FIG. In the case shown in FIG. 4B, the vertical synchronizing signal VSY is added to the video signal with a delay of 10 cycle sums of the horizontal synchronizing signal HSY compared to the case of FIG. 4A.
[0052]
Accordingly, as shown in FIG. 4B, the image displayed on the display screen 21a of the liquid crystal panel 21 shifts upward by ΔL corresponding to a period sum of ten horizontal synchronization signals HSY, that is, ten horizontal lines. . Along with this, the lower part, which is hard to see on the display screen 21a, moves upward by ΔL, so that the display image on the display screen 21a is displayed satisfactorily throughout.
[0053]
Therefore, if such a display image is incident on the front windshield 1 as display light by the liquid crystal panel 21, the virtual image m formed in front of the front windshield 1 is dark over night, such as at night. Even in an environment, it is easy for the driver to see. Therefore, even if, for example, a person is included in the lower part of the display image on the display screen 21a, it can be visually recognized well.
[0054]
Here, as in the related art, when the driver performs the optical axis adjustment by mechanically moving the infrared camera 10 with a screw or the like, the driver in the driving state of the vehicle maintains the driving posture. It is necessary to perform the operation while looking at the display image of the display device while maintaining the state, which causes a problem that the driver is forced to perform a difficult operation. Further, in the above-mentioned conventional mechanical adjustment means, since the adjustment means must be observed while looking at the head-up display 20, the workability of the optical axis adjustment is poor.
[0055]
On the other hand, according to the present embodiment, since the operation switch 30 is provided near the driver's seat in the vehicle interior, it is not necessary to change the driving posture of the driver with respect to the vehicle, and the operation switch 30 is maintained as it is. The optical axis can be adjusted only by repeating the operation of Step 30, and the optical axis can be adjusted while viewing only the head-up display 20.
[0056]
Moreover, according to the present embodiment, the existing DSP 13 provided in the night vision camera 10 allows the synchronization signal to be generated according to the optical axis position set by the operation switch 30 and the optical axis position calculated by the steering angle sensor 40. Since the video signal is generated at a shifted timing, it is possible to electrically adjust the optical axis without the need for the preset counter required in the above-mentioned prior application, thereby suppressing an increase in cost. Can be achieved.
[0057]
(Other embodiments)
In the above embodiment, the amount by which the optical axis position is shifted in the up-down direction is set by the operation switch 30, but the amount by which the optical axis position is shifted in the left-right direction may be set. In this case, the timing at which the horizontal synchronizing signal HSY is applied may be shifted by the DSP 13 in accordance with the amount set by the operation switch 30 and applied to the video signal.
[0058]
In the above embodiment, the DSP is used as the video signal generating means 13 provided in the camera 10. However, in the embodiment of the present invention, a microprocessor may be used as the video signal generating means 13.
[0059]
In the embodiment of the present invention, the ON of the operation switch 30 is not limited to the case where a delay of 10 cycle sums is given, and if necessary, the cycle sum of the ON cycle of the ON switch 30 may be changed as needed. The number of delays may be changed as appropriate.
[0060]
Further, in the embodiment of the present invention, even if the telephoto lens 11 is omitted from the infrared camera 10, substantially the same operation and effect as the above embodiment can be achieved.
[0061]
Further, in the embodiment of the present invention, a dip switch may be employed instead of the operation switch 30, and data corresponding to the number of times the operation switch 30 is turned on may be input to the microcomputer 23 by the dip switch. The operation switch means having the same function as the DIP switch is not limited to the DIP switch.
[0062]
In the above-described embodiment, the description has been given of the case where the optical axis is adjusted by operating the operation switch 30 while the driver is sitting in the driver's seat. The present invention can also be applied to the case where the optical axis is adjusted by using. Therefore, in this case, it is not necessary to provide the operation switch 30 in the vicinity of the driver's seat in the vehicle compartment. And a dedicated tool may be connected to either the infrared camera 10 or the head-up display 20 when adjusting the optical axis.
[0063]
Here, in the above-mentioned conventional mechanical adjustment means, it is necessary to attach a cover so as not to be easily touched after the adjustment, but when using the above-mentioned dedicated tool, it is mounted on a vehicle and has a microcomputer or the like. The optical axis adjustment can be completed simply by writing the adjustment contents to the nonvolatile memory of the ECU, so that the above-mentioned conventional cover can be eliminated, and the optical axis can be adjusted without attaching / detaching the cover. Adjustments can be made.
[0064]
In the embodiment of the present invention, an EL panel may be used instead of the liquid crystal panel 21.
[0065]
In implementing the present invention, the night vision camera mounted on the vehicle is not limited to the infrared camera 10 and may be a night vision camera capable of shooting even at night.
[0066]
Further, in carrying out the present invention, the on-vehicle display device is not limited to the head-up display, but a display device such as a liquid crystal panel incorporated in the instrument panel 2 of the vehicle or a rear display device for the rear passenger to visually recognize. The present invention may be applied to
[0067]
In the embodiment of the present invention, the video signal output from the in-vehicle night vision camera 10 to the in-vehicle display device 20 may be an analog video signal or a digital video signal.
[0068]
Further, the vehicle of the present invention is not limited to a passenger car but may be a vehicle such as a bus or a truck.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an embodiment of the present invention.
FIG. 2 is a diagram showing an electric circuit configuration of the embodiment.
FIG. 3 is a timing chart showing a relationship among a vertical synchronization signal, a horizontal synchronization signal, and a vertical start pulse signal in the embodiment.
FIG. 4A is a schematic diagram showing a display image before an operation switch is turned on among display images on a display screen of a liquid crystal panel in the embodiment, and FIG. It is a schematic diagram which shows a display image.
FIG. 5 is an exemplary diagram showing a display image on a liquid crystal panel of a conventional head-up display in relation to a horizontal synchronization signal and a video signal.
FIG. 6 is a timing chart showing the relationship between the horizontal synchronization signal of FIG. 5 and a vertical synchronization signal.
[Explanation of symbols]
10: infrared camera (vehicle night vision camera), 12: CCD element (imaging means),
13 ... DSP (video signal generating means),
20 head-up display (vehicle display),
21: liquid crystal panel (display unit), 30: operation switch (operation switch means).

Claims (4)

An on-vehicle night-vision camera (10) having imaging means (12) for converting an image in front of the vehicle into an electric signal, and video signal generating means (13) for generating a video signal based on the electric signal;
An in-vehicle display device (20) having a display unit (21) for displaying an image based on the video signal;
Operating switch means (30) for setting an optical axis position of an image with respect to the display section (21);
The video signal generating means (13) sets the timing of at least one of a horizontal synchronizing signal and a vertical synchronizing signal included in the video signal in accordance with an optical axis position set by the operation switch means (30). A display system for a vehicle, wherein the video signal is generated while being shifted. An on-vehicle night-vision camera (10) having imaging means (12) for converting an image in front of the vehicle into an electric signal, and video signal generating means (13) for generating a video signal based on the electric signal;
An on-vehicle display device (20) having a display unit (21) for displaying an image based on the video signal,
An optical axis position of the image with respect to the display section (21) when the vehicle is traveling straight ahead is defined as an optical axis position when traveling straight ahead,
An optical axis position of the image with respect to the display section (21) when the vehicle is traveling on a curve is defined as a curve optical axis position;
The video signal generating means (13) shifts the timing of the horizontal synchronizing signal included in the video signal so that the optical axis position at the time of the curve is shifted to a curved side from the optical axis position at the time of the straight traveling. A display system for a vehicle, wherein the video signal is generated. 3. The vehicle display system according to claim 1, wherein the video signal generating means is one of a digital signal processor and a microcomputer. The vehicle-mounted display device according to any one of claims 1 to 3, wherein the vehicle-mounted display device (20) is a head-up display device that displays an image as a virtual image on a front windshield (1) of the vehicle. Display system.

Images