JP2002234360A - Display device for vehicle and its display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent visibility of display from deteriorating without increasing a power consumption of a light source. SOLUTION: An image is projected and displayed to a whole image plane of a convex screen 5 by a first projection means 7 provided with the light source, and an image obtained by a second projection means 9 provided with a laser 45 is superposed on a certain part of the image obtained by the first projection means 7, thereby carrying out an image display.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for a vehicle that presents information to a user by display and a display method thereof.

[0002]

2. Description of the Related Art As a conventional vehicle display device, for example, there is one as shown in FIG. 10 (JP-A-6-26296).
No. 4). This vehicle display device projects and projects information necessary for a vehicle on a curved screen 3 mounted on the front surface of a meter case 1 by a projector 5 arranged in the meter case 1.

[0003]

By the way, in such a conventional projection type vehicle display device, it is necessary to increase the display brightness in order to prevent the display visibility from being deteriorated by extraneous light. is there.

However, in order to increase the brightness of the display in the projection type display device, it is necessary to increase the power of the light source in the projector 5, so that the power consumption increases and the amount of heat generated also increases. Considering the heat dissipation of the device, the size of the entire device is increased.

Accordingly, an object of the present invention is to prevent the visibility of a display from deteriorating without increasing the power consumption of a light source.

[0006]

In order to achieve the above object, according to the present invention, a display means for displaying a projection image, a first projection means for projecting display information on the display means, A second projection unit that projects display information on at least a part of a screen of the display unit, and a control that superimposes a projection image by the second projection unit on a specific portion of the projection image by the first projection unit. And a projection image control unit that performs the control.

According to a second aspect of the present invention, in the configuration of the first aspect, the first projection means and the second projection means are held by the same holding member.

According to a third aspect of the present invention, in the configuration of the first or second aspect, a vehicle use environment detecting means for detecting a use environment of the vehicle is provided, and the projection image control means detects the vehicle use environment by the vehicle use environment detection means. Based on the vehicle use environment, at least one of the projection image by the first projection unit and the projection image by the second projection unit is controlled.

According to a fourth aspect of the present invention, in the configuration of the third aspect, the projection image control means stops the projection operation by the first projection means based on the vehicle use environment detected by the vehicle use environment detection means. There is a configuration to make it.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect of the invention, the vehicle operating environment detecting means comprises engine operating state detecting means for detecting an operating state of an engine mounted on the vehicle. When the state detection means detects the stop state of the engine, the projection operation by the first projection means is stopped.

According to a sixth aspect of the present invention, in the configuration of any one of the third to fifth aspects, the vehicle use environment detecting means comprises an illuminance sensor for detecting ambient illuminance, and the projection image control means comprises: The second according to the detection value of the illuminance sensor
The brightness of the image projected by the projection means is adjusted.

According to a seventh aspect of the present invention, in the configuration according to any one of the first to sixth aspects, while the projection light of the first projection means is transmitted between the first projection means and the display means, Polarizing means for reflecting the projection light of the second projection means and combining it with the projection light of the first projection means is provided.

According to an eighth aspect of the present invention, in the configuration according to any one of the first to seventh aspects, inspection light is projected onto a reference position on a projection image projected on the display means by the first projection means. Projecting means, reference position detecting means for detecting a reference position projected by the inspection light projecting means, and a reference position detected by the reference position detecting means and a projection image control means on a display means by a second projecting means. And a display position adjusting means for adjusting the position of the specific part to match the reference position based on the comparison result of the comparing means. .

According to a ninth aspect of the present invention, in the configuration of the eighth aspect, while the projection light of the first projection means is transmitted between the first projection means and the display means, the second projection means is provided. Is reflected and combined with the projection light of the first projection unit, and is projected from the inspection light projection unit to a reference position on a projection image projected on the display unit by the first projection unit. Polarizing means for reflecting inspection light,
Between the polarizing means and the second projecting means, the second
A second polarizing means for reflecting the projection light of the projection means and guiding the light to the polarization means, and transmitting the inspection light from the inspection light projection means reflected by the polarization means; and The reference position detecting means is arranged in front of the transmitted inspection light in the traveling direction.

According to a tenth aspect of the present invention, in the configuration of the eighth or ninth aspect, the inspection light from the inspection light projecting means is:
The configuration includes a visible light component.

According to an eleventh aspect of the present invention, the inspection light is projected onto a reference position on a projection image projected on the display means by the first projection means, and the projected reference position is detected. A display for a vehicle in which the projection image control means adjusts the position of the specific part to match the reference position based on the result of comparison with the position of the specific part for displaying the projection image on the display means by the second projection means. As a display method of the device.

[0017]

According to the first aspect of the present invention, since the projection image of the second projection means is superimposed and displayed on a specific portion of the projection image on the display means by the first projection means. Regarding the image of the specific part by the projection means of 2,
For example, high-luminance display can be performed by a power-saving small laser scanner or the like, so that visibility can be improved even when extraneous light is present.

According to the second aspect of the present invention, since the first projection means and the second projection means are held by the same holding member, the distance between the first projection means and the second projection means is reduced. so,
The displacement of the projected image can be prevented.

According to the third aspect of the present invention, at least one of the image projected by the first projecting means and the image projected by the second projecting means is controlled based on the use environment of the vehicle. Appropriate display according to the vehicle usage environment can be performed.

According to the fourth aspect of the present invention, the projection operation by the first projection unit is stopped based on the vehicle usage environment, so that only the projection image by the second projection unit can be displayed. Low power consumption can be achieved.

According to the fifth aspect of the present invention, the projection operation by the first projection means is stopped when the engine mounted on the vehicle is stopped. Can be displayed, and the load on the battery can be reduced.

According to the sixth aspect of the present invention, the brightness of the second projection means is adjusted according to the surrounding illuminance detected by the illuminance sensor, so that the visibility can be further improved.

According to the seventh aspect of the present invention, the respective projection lights of the first projection means and the second projection means are combined and projected on the display means by the polarization means. Can be shared by the first and second projection means, and the number of parts can be reduced and the size of the entire apparatus can be reduced.

According to the eighth aspect of the present invention, the projection projected by the second projection means to the reference position where the inspection light is projected on the display means on which the projection image projected by the first projection means is projected. Since the displacement of the specific part of the image is adjusted, the image projection position by the second projection unit can be made appropriate.

According to the ninth aspect of the present invention, the projection means combines the respective projection lights of the first projection means and the second projection means and projects the combined light on the display means, and the image projected by the first projection means. Is adjusted with respect to the reference position where the inspection light is projected on the display means on which the projection light is projected, so that the deviation of the specific portion of the projection image projected by the second projection means is adjusted. The optical system can be shared by the first and second projection units, so that the number of components can be reduced and the size of the entire apparatus can be reduced, and the image projection position of the second projection unit can be made appropriate.

According to the tenth aspect of the present invention, since the inspection light from the inspection light projection means includes a visible light component, the user can reliably recognize the projection position of the inspection light, The image projection position by the projection means can be made more appropriate.

According to the eleventh aspect of the present invention, the projection projected by the second projection means to the reference position where the inspection light is projected on the display means on which the projection image projected by the first projection means is projected. Since the displacement of the specific part of the image is adjusted, the image projection position by the second projection unit can be made appropriate.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view of a vehicle display device according to a first embodiment of the present invention in a state where the vehicle is mounted.
FIG. 2 is a configuration diagram showing details of the vehicle display device. As shown in FIG. 1, a screen 5 as a convex curved display means is arranged in a lower portion in front of an eye point 3 of a user including a driver and a passenger in a vehicle compartment 1. On this screen 5, a first projection means 7 and a second
Is projected as a real image, and the image is presented to the user. 11 is a windshield.

As shown in detail in FIG. 2, the screen 5 polarizes (diffuses) the light from the first and second projection units 7 and 9 to a limited range, and A light diffusing plate 13 is provided for diffusing light from the user in the direction of the user so that the user can view the image as an image, and for controlling the direction and distribution of light. As the light diffusing plate 13, a transparent plastic plate whose surface is blasted to diffuse light, a milky white plastic plate, a diffusion type liquid crystal, or the like is used. Further, the light diffusion plate 13 may be one in which a diffusion layer made of paper or the like is sandwiched between two transparent glasses or plastic plates, or one using a Fresnel lenticular lens.

On the first and second projection means 7 and 9 sides of the light diffusing plate 13, the light low reflection film 1 made of an interference film or the like is provided.
5 are provided. The light low-reflection film 15 is an optical film composed of a light interference film for reducing the surface reflectance or a transparent film having a low refractive index. Light from the first and second projection units 7 and 9 is used for the light low reflection film 15. The light diffusion plate 13 prevents stray light inside the device.
And serves to reduce the double reflection image of the light (image).

On the surface of the light diffusion plate 13 on the side opposite to the low light reflection film 15, a viewing angle control optical filter such as a louver for reducing reflection and reflection of extraneous light or a translucent smoke filter is provided. A light absorbing layer 17 is provided.

On the surface of the light absorbing layer 17, a low light reflection film 19 is provided.
Further, a hard coat film and a transparent thin film 21 having a water repellent effect and having a catalytic function are provided on the surface thereof so as to prevent scratches and dirt.

As described above, the screen 5 described above
Although it has a layered structure, ITO (Indium Tin Oxide) for reducing electromagnetic noise is further provided on the surface of the transparent thin film 21.
A thin film made of a transparent and electrically conductive transparent conductive film (pixel electrode) such as a film may be provided.

Further, in order to prevent surface reflection and reflection of windows in a room, for example, a NEXY sheet manufactured by Arisawa Optec may be attached to the surface of the screen 5. As shown in FIG. 3, the surface of this sheet has a saw-tooth shape, and the external light is blocked by the black painted surface B and absorbed, so that it does not enter and is reliably seen from the eye point 3 direction indicated by the arrow P. is obtained by the display does appear to be.

The direction of the louver may be changed according to the screen position so that the peak of the transmittance may be directed to the user in accordance with the curvature of the screen 5, or the distance between the projection optical system 33 and the screen 5 may be changed. A hologram that is deflected (changes the traveling direction of light) using a group of directivity-converting micro prisms or a light diffraction phenomenon may be interposed therebetween.

The screen 5 is not limited to a convex curved surface, but may be of various types depending on the design of the instrument panel, such as a composite surface of a concave curved surface and a flat surface.

As shown in detail in FIG. 2, the first projection means 7 includes a light source 23, a reflecting mirror 25, and a color wheel 27.
, An integrator 29, an image display element 31, and a projection optical system 33.

The light source 23 is composed of a halogen lamp, a high-pressure discharge lamp or the like, and the brightness and on / off of the light source 23 are controlled by a light source control circuit 35. The reflecting mirror 25 is
It is composed of a paraboloid of revolution, a spheroidal surface, and other complex surfaces that reflect light from the surface.

The color wheel 27 is disposed near the focal point of the light from the reflecting mirror 25, and converts the white light from the reflecting mirror 25 into
An optical element that temporally divides the color into three colors of RGB (red, green, and blue), and is driven and controlled by a color wheel control circuit 37. The color wheel 27 is composed of color filters of three colors of RGB, and time-divides the light of the light source 23 into three primary colors by high-speed rotation, and performs color display by mixing the colors. This display method is time-division synthesis (mixed color). System or color sequential system.

This system generally has RGB three-color light sources and does not require the color wheel 27. The RGB simultaneous color mixing system (as shown in FIG. 4, each light from the three-color light sources R, G, and B is Color is mixed or reflected or transmitted), but the RGB simultaneous color mixing method uses the same intensity as the white light source used for the color sequential method when the light source of each color is the same as the color sequential method. 3 times. The light source used in the RGB simultaneous color mixing system shown in FIG. 4 includes an LED and a neon tube.

The integrator 29 is an optical element for efficiently projecting the light from the light source 23 to the front image display element 31. The light from the light source 23 has a uniform brightness on the surface of the image optical element 31 and is almost uniform. It has a function of forming a real image of a point light source on the image optical element 31 as parallel light, and the minute lenses are arranged in an array.

The image display element 31 includes a TFT liquid crystal, a ferroelectric liquid crystal, an LCOS (reflection type liquid crystal: a reflection type display element which puts a liquid crystal on a Si wafer and turns on and off), a DMD.
(Digital Micromirror Device) or the like, and the driving is controlled by an image display element control circuit 39. The image display element 31 is provided with a liquid crystal cell or a micromirror corresponding to each pixel of an image by a drawing control circuit 43 as a projection image control means for converting into an electric signal according to image data 41 projected and displayed on the screen 5. Is turned on and off, the amount of light that is time-divided into each color of RGB is further represented by the PWF
(Pulse Width Modulation) Controlling and adjusting, and controlling and selecting the color to be reproduced in that condition. That is, this is RG
B is an additive color mixture in which brightness and color can be controlled by the ON time length of each color.

The image data 41 described above is transmitted to the screen 5
The shape is preliminarily distorted in accordance with the shape of the screen 5, for example, by inverting the shape of the screen 5. Thus, a straight line can be displayed as a straight line even on a curved surface. Alternatively, an aspherical (reflective) optical system may be interposed between the projection optical system 33 and the screen 5 to optically correct distortion.

The projection optical system 33 is for projecting the light from the image display element 31 onto the screen 5 and comprises a projection lens group and a mirror group. The distance from the projection optical system 33 to the screen 5 is shortened in order to reduce the size of the entire apparatus. In this case, if the display size is increased, the angle of view increases, and accordingly, the aberration of the projected image (actual image becomes a real image). As the distance (tilt angle) from the optical axis increases, the position of the imaging point becomes farther away from the ideal point (the degree of deviation).

In a normal projection type display device, that is, a projector, various optical lenses are combined to reduce this aberration. However, this aberration is convenient for the curved screen 5. In particular, a curved screen corresponding to the curvature of field not only projects a sharp image but also eliminates the need for an optical system for aberration correction (image). The aberration correction control of the surface curvature includes the combination of convex and concave lenses, the focal length of the lens, the lens material (such as the refractive index and the Abbe number representing the change in the refractive index of the optical material with respect to the light wavelength), and the aperture diameter of the projection optical system. It is done by adjustment etc.). Thereby, cost reduction, weight reduction, and space saving of the device can be realized.

As shown in detail in FIG. 2, the second projection means 9 includes a laser 45 for emitting a highly directional light beam and a scanner 47 for two-dimensionally scanning the light beam from the laser 45. Have. The brightness modulation and ON-OFF of the laser 45 are controlled by a laser control circuit 49, and the driving of the scanner 47 is controlled by a scanner control circuit 51.

As the laser 45, a very small semiconductor laser is used. In general, there is a long wavelength (red) having a high radiation intensity. Therefore, when a light intensity is required, this long wavelength is used. If further light intensity is required, a small pencil-shaped He-Ne laser (wavelength: 632.8 n
m) may be used. The color of the light beam is not limited to red, and green, blue, white, and the like may be used.

The scanner 47 includes a polygon mirror, a mirror whose mirror is vibrated (rotated) by a motor, a mirror whose angle is changed by electrostatic force, a hologram (diffraction grating), and a piezo element. A device that performs vibration scanning is used. In the case where the scanner 47 always performs the vibration scanning, a device for detecting the mirror angle is provided to monitor the drawing position. In addition, the laser light is turned on and off only at a portion required as an image to be drawn. Those that can arbitrarily scan the X and Y coordinates can provide a more efficient and bright display in a single-stroke method.

It is assumed that the first projection means 7 and the second projection means 9 are held by the same holding member (not shown). As the holding member, each of these projection means 7,
A housing for housing and fixing 9 may be used.

Next, the operation will be described. As shown in FIG.
The light from the light source 23 is reflected by the reflecting mirror 25 and reaches the color wheel 27, where the light from the light source 23 is time-divided into three primary colors of RGB, and further passes through the integrator 29, the image display element 31, and the projection optical system 33. The image is projected on the screen 5 as an image of the image data 41. Although this screen 5 also depends on its gain characteristics, since the display surface is a convex curved surface, there are portions that are not visible (or hard to see) depending on the position of the observer (user). Take this as a reverse hand,
Necessary information can be provided to a necessary person, and confusion and a decrease in recognition due to unnecessary useless display information can be prevented.

For example, although not shown, in the case of a screen having a curved surface convex in the left-right direction of the vehicle, the driver needs the vehicle speed, the number of engine revolutions, the mileage, and the like. Programs and game screens of in-vehicle game machines,
Internet search screens are useful. In addition, for road guidance information in the navigation system, the road information immediately ahead of the current location is useful for the driver, but for the passenger,
Information that is complicated for the driver but not so complicated for the passenger, such as detailed information on various places that have passed by car and detailed information on the traffic congestion at the sightseeing spot, is useful.

By displaying such useful information for the driver and the passenger at the optimal position on the screen 5 having the convex curved surface, information that is not useful for the driver and the passenger enters the field of view. Without this, only useful information can be recognized, and information can be easily collected and useful display information can be obtained.

On the other hand, the laser 4 in the second projection means 9
The light beam 5 is incident on the scanner 47 and scanned two-dimensionally in the X-axis and the Y-axis. Then, the light beam is projected on the screen 5, and the image data 41 processed by the drawing control circuit 43 is drawn. The image to be drawn is completely the same as the image by the first projecting means 7, or an icon or menu of a figure or a character, or a vehicle position or a destination in navigation information in order to “get attention” of the user. Or the minimum necessary information for traveling based on the damage of the light source 23 of the first projection unit 7 (functioning as a fail-safe mechanism).

Further, for example, since the battery cannot be charged by the alternator while the engine is stopped, the battery can be protected by drawing only with the power saving laser 45. Furthermore, for a few minutes after the passenger gets off the vehicle, he or she draws an artistic geometric figure or the like using only the laser 45 or controls the luminance with the signal of the illuminance sensor.
The display may be displayed in a color system opposite to the color depending on the color of the ambient light. That is, the engine operating state detecting means for detecting the stop of the engine and the illuminance sensor constitute a vehicle use environment detecting means for detecting the use environment of the vehicle.

Since the first projecting means 7 and the second projecting means 9 are held by a holding member composed of the same casing or the like, the image projected by the first projecting means 7 and the second A deviation from the image projected by the projection means 9 can be prevented.

As described above, a low power consumption laser 45 is added to the image projected by the first projection means 7 having the light source 23.
By superimposing the images projected by the second projecting means 9 consisting of a laser, it is possible to display with high brightness by the laser 45 without increasing the power of the light source 23, to suppress the heat generation, and to increase the size of the entire apparatus. It is possible to prevent the visibility of the display from deteriorating due to extraneous light while avoiding it.

In the above embodiment, the rear projection system in which the screen 5 is a transmissive screen is employed as the first projection means 7. However, a situation in which the light path is not always interrupted in the vehicle interior. If it can be ensured, a front projection system using a reflective screen may be adopted.

FIG. 5 is a schematic view of a vehicle display device according to a second embodiment of the present invention in a state where the vehicle is mounted. In this embodiment, a beam splitter (separation / combination element) 53 as polarization means is interposed between the image display element 31 and the projection optical system 33 in the first embodiment shown in FIG. As the beam splitter 53, one having selectivity in polarization or light wavelength or a simple half mirror is used. As shown in the schematic diagram of FIG. 6, the light from the first projection unit 7 is transmitted by the beam splitter 53 while the second
The light from the projection means 9 is reflected, these lights are combined with each other, and passes through the same projection optical system 33 to project an image on the same screen 5.

Depending on the type of the scanner 47, the scannable angle is as narrow as ± 5 to 10 degrees, and when the distance to the screen 5 is short, a projection lens is required. This projection lens is shared with the projection optical system 33 of the first projection means 7.

When the display element of the screen 5 is a liquid crystal, the light from the light source 23 is linearly polarized light, so that the beam splitter 53 transmits this polarized light component, while the light from the laser light is also linearly polarized light. The polarization component is reflected by the beam splitter 53.

The display element on the screen 5 has DMD
When using something unrelated to the polarization component like
Using a beam splitter 53 utilizing the wavelength selectivity of light, only light of a specific wavelength is reflected and light of another wavelength is transmitted. In this case, since the wavelength of the laser beam has almost no spread, a beam formed by an interference film or a hologram is used for the beam splitter 53.

According to the second embodiment, the projection optical system 33 up to the screen 5 is connected to the first projection unit 7 and the second
, And the number of parts and the size of the entire apparatus can be reduced.

FIG. 7 is a schematic diagram of a vehicle display device according to a third embodiment of the present invention in a state where the vehicle is mounted.
This embodiment differs from the configuration of the second embodiment shown in FIG. 5 in that an IR (infrared) laser as inspection light projection means for projecting laser light serving as inspection light from the user side toward the screen 5. 55, a second beam splitter 57 as a second polarizing means, and a CCD as a reference position detecting means
A sensor 59, a CCD sensor control circuit 61 for controlling the CCD sensor 59, and a comparison circuit 63 as comparison means are added, and the projection position on the screen 5 by the second projection means 9 becomes the reference position. It is adjusted as follows.

The laser light of the IR laser 55 contains a visible light component so that a user can recognize the position projected on the screen 5. Second beam splitter 57
Have the property of transmitting IR light and reflecting visible light. The CCD sensor 59 is a CCD sensor sensitive to the wavelength range of the IR laser 55, and detects a two-dimensional spatial position. The comparison circuit 63 compares the projection position of the IR laser 55 detected by the CCD sensor 59 with the drawing position on the screen 5 by the scanner 47, and outputs the difference.

Next, a method of adjusting the display position in the third embodiment will be described with reference to the flowchart of FIG. 8 and the operation explanatory diagram of FIG. First, when the user turns on a display position adjustment switch (not shown) (step 80).
1) The adjustment image is displayed on the screen 5 by the first projection means 7 (step 803). Here, the IR laser 55, a point serving as a reference position in the display image on the screen 5 in FIG. _{9 (a) A (X a} , Y a) toward projecting a laser beam (step 805). At this time, if the projection to the point A is difficult due to vibration or the like, the IR laser 55 is fixed to a structure such as a vehicle body or a seat, and the projection direction can be freely changed via a universal joint or the like. What is necessary is just a mechanism.

The IR laser light is diffused by the screen 5, but most of the light passes through the projection optical system 33, is reflected by the wavelength-selective beam splitter 53, and travels to the second beam splitter 57. . Since the second beam splitter 57 has a characteristic of reflecting a visible light component and transmitting an IR laser beam, the IR laser beam passes through the second beam splitter 57 and has sensitivity in an IR region. CCD
Sensor 59 is reached.

The CCD sensor 59 detects the position of the received IR laser light, and detects the detected value and a point A ( _XL ,) corresponding to the drawing position in FIG.
Y _L ) is compared with the comparison circuit 63 (step 80).
7). _{Here, A (X a, Y a} ) -A (X L, Y L) is to determine whether the allowable range (step 809), if you are out of the allowable range, the point A (X _L, Y _L ) is point A
(X _a, Y _a) adjusts the position of the image signals so as to overlap (step 811).

On the other hand, A (X _a , Y _a ) −A (X _L , Y _L )
There if within the allowable range, performs an OK display (step 813), followed by point the other reference position in FIG. 9 (a) in the IR laser 55 B (X _b, Y _b) projecting the (Step 815). The projected IR laser beam, the point _A (X _a, Y _a) the reaching CCD sensor 59 similarly to the IR laser beam when the projection, the CCD sensor 59 detects the position of the IR laser beam light-receiving Then, this detected value and the second
Projection means 9 according to FIG. 9 (b) corresponding to a point B (X _{L, Y L)} at the writing position in the compared by the comparison circuit 63 (step 817).

[0070] _{Here, B (X b, Y b} ) -B (X L,
(Y _L ) is within the allowable range (step 81).
9) If it is out of the allowable range, the point B ( _XL , Y
The _L), adjust the position of the image signals so that the point _A (X _a, Y _a) is moved in the direction of rotation about the in point B (X _b, the rotational direction Y _b) matching (step 821) . If it is within the permissible range, the completion of adjustment is displayed on the screen 5 (step 823). The position adjustment of the image signal is performed by the drawing control circuit 43. Therefore, the drawing control circuit 43 includes a display position adjusting unit.

As described above, in the third embodiment,
By projecting the IR laser beam on the screen 5 as a reference position to be displayed, the user can appropriately adjust the image projection position on the screen 5 by the second projection means 9. At this time, since the IR laser light contains a visible light component, the user can reliably recognize the projection position of the IR laser light, and the display position can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a schematic view of a vehicle display device according to a first embodiment of the present invention in a state where the vehicle is mounted.

FIG. 2 is a configuration diagram showing details of FIG. 1;

FIG. 3 is a sectional view of a sheet that can be attached to a screen used in the vehicle display device of FIG. 1;

FIG. 4 is an explanatory diagram of an RGB simultaneous color mixture method.

FIG. 5 is a schematic view of a vehicle display device according to a second embodiment of the present invention in a state where the vehicle is mounted.

FIG. 6 is an explanatory diagram illustrating a traveling state of light according to a second embodiment.

FIG. 7 is a schematic diagram of a vehicle display device according to a third embodiment of the present invention in a state where the vehicle is mounted.

FIG. 8 is a flowchart illustrating a display position adjusting method according to a third embodiment.

FIG. 9 is an explanatory diagram illustrating an operation of a display position adjusting method according to the third embodiment.

FIG. 10 is a cross-sectional view of a vehicle display device showing a conventional example.

[Explanation of symbols]

Reference Signs List 5 screen (display means) 7 first projection means 9 second projection means 43 drawing control circuit (projection image control means, display position adjustment means) 53 beam splitter (polarization means) 55 IR laser (inspection light projection means) 57 Second beam splitter (second polarizing means) 59 CCD sensor (reference position detecting means) 63 Comparison circuit (comparing means)

Claims (11)

[Claims] 1. A display means for displaying a projection image, a first projection means for projecting display information on the display means, and a second projection means for projecting display information on at least a part of a screen of the display means. And a projection image control means for controlling the projection image by the second projection means to be superimposed on a specific portion of the projection image by the first projection means. 2. The vehicle display device according to claim 1, wherein the first projection means and the second projection means are held by a same holding member. 3. A vehicle use environment detecting means for detecting a use environment of a vehicle, wherein the projection image control means detects a projection image by the first projection means based on the vehicle use environment detected by the vehicle use environment detection means. 3. The vehicle display device according to claim 1, wherein at least one of the control unit and the image projected by the second projection unit is controlled. 4. The vehicle display according to claim 3, wherein the projection image control means stops the projection operation by the first projection means based on the vehicle use environment detected by the vehicle use environment detection means. apparatus. 5. The vehicle operating environment detecting means comprises an engine operating state detecting means for detecting an operating state of an engine mounted on a vehicle. When the engine operating state detecting means detects an engine stop state, The vehicle display device according to claim 4, wherein the projection operation by the first projection unit is stopped. 6. The vehicle use environment detecting means comprises an illuminance sensor for detecting the illuminance of the surroundings, and the projection image control means adjusts the brightness of the projection image by the second projection means according to the detection value of the illuminance sensor. The vehicle display device according to any one of claims 3 to 5, wherein: 7. The first projection unit transmits the projection light of the first projection unit and reflects the projection light of the second projection unit between the first projection unit and the display unit. 2. A polarizing means for combining light with projection light.
7. The display device for a vehicle according to any one of claims 6 to 6. 8. An inspection light projection means for projecting inspection light on a reference position on a projection image projected on a display means by a first projection means, and a reference for detecting a reference position projected by the inspection light projection means. The position detection means, the reference position detected by the reference position detection means and the projection image control means
Comparing means for comparing the position of the specific part to be displayed on the display means with the projection means, and display position adjusting means for adjusting the position of the specific part to match the reference position based on the comparison result of the comparing means. The vehicle display device according to any one of claims 1 to 7, further comprising: 9. A method for transmitting the projection light of the first projection means and reflecting the projection light of the second projection means between the first projection means and the display means so as to reflect the light of the first projection means. Polarizing means for combining the projection light with the projection light and reflecting the inspection light projected from the inspection light projection means with respect to a reference position on the projection image projected on the display means by the first projection means; And the second projection means, reflects the projection light of the second projection means and guides the light to the polarization means, and transmits the inspection light reflected by the polarization means from the inspection light projection means. 9. The vehicle display device according to claim 8, wherein a second polarizing means is provided, and the reference position detecting means is disposed in front of the traveling direction of the inspection light transmitted through the second polarizing means. 10. The inspection light from the inspection light projecting means includes a visible light component.
The display device for a vehicle as described in the above. 11. An inspection light is projected onto a reference position on a projection image projected on the display means by the first projection means, and the projected reference position is detected. On the basis of the result of comparison with the position of the specific part for displaying the projection image on the display means by the second projection means,
A display method for a vehicle display device, wherein the position of the specific part is adjusted to match the reference position.