JP2004268638A - Display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for a vehicle capable of reducing display images and highly enlarging a virtual image compatibly at low cost. <P>SOLUTION: In the display device 1 for a vehicle, an image of a display 3 is projected to a wind shield 5 through an enlargement mirror 4 to be displayed in the virtual image. The image of the display 3 provided such that a masking mask 33 forming a peripheral edge shape of of the image is previously distorted is formed to an approximate rectangular shape. The masking mask 33 distorted so as to cover a peripheral edge of the image of the approximately rectangular display 3 is mounted to the display 3. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is also referred to as a head-up display, and is used for a vehicle that displays an image of a display unit directly or through a magnifying glass on a front window to display a virtual image in order to mainly transmit information from a vehicle side to a driver. It belongs to the technical field of display devices.
[0002]
[Prior art]
Conventional display devices for vehicles have a storage content of an external ROM that can exchange a reverse image for superimposition to be displayed on a display device so that distortion generated when image light of the reverse image for superimposition is reflected is canceled. (For example, see Patent Document 1).
[0003]
There is also provided a correction member which is a lens having only a curved surface formed by a single radius of curvature capable of canceling distortion (for example, see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-2002-205571 (pages 4-6, FIG. 3)
[0005]
[Patent Document 2]
JP-A-2002-202475 (Pages 3-5, FIG. 5)
[0006]
[Problems to be solved by the invention]
However, in the related art, in a head-up display for a vehicle such as an automobile in which display information is displayed as a virtual image having a large magnification, the front window generally has a curved surface shape that is asymmetric in the vertical direction due to the structure of the automobile. Having. Also, the front window has a symmetrical curved shape in the left and right direction, but is positioned at both left and right ends so as to face both the view area of the front window located above and below the instrument panel and the display surface of the display device. Therefore, the optical axis of the concave mirror is inclined in the upward direction of the front window.
Also, when the magnification is large, the radius of curvature suddenly decreases, and in combination with the asymmetrical curved shape of the front window, the distortion of the virtual image due to the display light portion of the display light reflected at the periphery of the concave mirror is remarkable. Had the problem of becoming
As a countermeasure, providing a correction lens or distorting an image in advance increases the cost. However, in order to obtain a large display image at low cost, it is necessary to increase the magnification, which is incompatible.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular display device that can achieve both reduction of a display image and high magnification of a virtual image at low cost. is there.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, in a vehicle display device for projecting an image on a display unit directly or through a magnifying glass to a front window of a car and displaying the image as a virtual image, a peripheral shape of the image is determined. The present invention is characterized in that an image peripheral frame to be formed is provided in a shape distorted in advance.
The “peripheral shape of an image” in the present invention refers to the shape of the entire image represented by a rectangle, an ellipse, a polygon, or a peripheral edge that is in contact with the outside of an image having a complicated combination.
[0009]
According to the second aspect of the present invention, the image of the display unit is formed in a substantially rectangular shape, and an image peripheral frame distorted so as to cover the periphery of the image of the substantially rectangular display unit is attached to the display unit. It is a characteristic means.
[0010]
Function and Effect of the Invention
According to the first aspect of the present invention, the image displayed on the front window is distorted by distorting the image peripheral frame in advance, but the peripheral shape of the image becomes a display image with the distortion corrected. As a human visual characteristic (illusion), even if there is some distortion in the content of the image, if the peripheral shape is not distorted, little or no distortion is felt. Therefore, a special image processing circuit for correcting distortion, such as a magnifying glass, or a lens such as a correction lens is not required, and both distortion correction and high magnification can be achieved at low cost.
[0011]
According to the second aspect of the present invention, the image distortion when displayed on the front window is corrected by attaching the image peripheral frame distorted so as to cover the peripheral edge of the image on the rectangular display unit. Since a rectangular image has a straight line portion and its shape is easily recognized by a human, it is easy for a human to feel that the distortion has been corrected. Further, since it is sufficient to attach the image peripheral frame, the cost can be reduced and used for the existing display, and the attachment can be easily performed, and the cost can be further reduced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment for realizing a vehicle display device of the present invention will be described based on a first embodiment and a second embodiment corresponding to the first and second aspects of the present invention.
[0013]
(First embodiment)
[0014]
First, the configuration will be described.
FIG. 1 is an explanatory diagram showing a display device of the vehicle display device of the first embodiment. FIG. 2 is an explanatory diagram of an image displayed on the front window by the vehicle display device of the first embodiment. FIG. 3 is a schematic view of the vehicle display device of the first embodiment. 1 to 3, a reference numeral 1 denotes a vehicle display device, a reference numeral 2 denotes a light source, a reference numeral 3 denotes a display (display unit), a reference numeral 31 denotes a circuit board, a reference numeral 32 denotes a liquid crystal display unit, a reference numeral 321 denotes an image periphery, and a reference numeral 33 denotes concealment. Mask (image peripheral frame), 4 is a magnifying glass, 5 is a front window, 60 is a non-corrected display image displayed on the front window, 601 is a peripheral image of the uncorrected display image, and 61 is a correction displayed on the front window. A displayed image, 611 is an image periphery of the corrected display image, A1 is a line of sight when looking outside during traveling, A2 is a line of sight when looking at the head-up display, and h is a person.
[0015]
In the first embodiment, the light source 2 is provided below the front window 5, and the display 3 that projects a display image by the projection of the light source 2 is provided. Further, a magnifying mirror 4 for magnifying and reflecting the image projected from the display 3 toward the front window 5 is provided.
As shown in FIG. 1, the display 3 includes a liquid crystal display unit 32 and a circuit board 31 for displaying on the liquid crystal display unit 32. Further, in the first embodiment, in consideration of the distortion due to the curvature of the curved surfaces of the magnifying glass 4 and the front window 5, the shape is pre-distorted so that it is displayed in a rectangular shape when displayed on the front window 5. A frame-shaped concealing mask 33 that covers the peripheral portion of the liquid crystal display unit 32 is provided. Thus, the image periphery of the liquid crystal display unit 32 becomes the image periphery 321 shown in FIG.
[0016]
Next, the operation will be described.
[0017]
[Image distortion correction effect]
In the vehicle display device 1 of the first embodiment, an image is projected on the magnifying glass 4 such that the light emitted from the light source 2 is applied to the display 3. The magnifying mirror 4 magnifies and reflects the incident image due to the curvature. The projected image magnified and reflected by the magnifying glass 4 is displayed on the front window 5, and the information display from the vehicle can be obtained without the driver changing the line of sight for traveling (A1, A2).
[0018]
At this time, if the rectangular liquid crystal display unit 32 is directly projected on the front window 5, the peripheral edge of the image distorted as shown in FIG. The display image 60 becomes 601.
[0019]
In the first embodiment, as shown in FIG. 1, a concealing mask 33 having a pre-distorted frame shape is attached to the liquid crystal display unit 32, so that the periphery of the image of the liquid crystal display unit 32 is the image shown in FIG. The periphery 321 is formed. When this display image is reflected by the magnifying glass 4 and projected and displayed on the front window 5, the image periphery 611 forms a rectangle as shown in FIG. 2B, and the entire image has a rectangular display image 61. Become. As can be seen from FIG. 2, when the periphery of the image is not distorted as a human visual characteristic, even if there is a slight distortion in the displayed content, the displayed content is not felt or only slightly distorted. And use the display comfortably.
[0020]
[Cost control action]
In the first embodiment, since the high magnification is performed by the magnifying mirror 4, the size of the liquid crystal display unit 32 can be reduced. Since the cost of the liquid crystal display unit 32 increases in proportion to the size of the display, reducing the size of the liquid crystal display unit 32 reduces the cost.
Furthermore, in the first embodiment, the mask 33 for concealment is used to correct the distortion of the display image. Since the concealing mask 33 only needs to cover the periphery of the liquid crystal display section 32, it is not necessary to use a special material, and the cost is low. In addition, even if it is attached to the existing liquid crystal display unit 32, the cost will be kept low.
[0021]
Next, effects will be described.
[0022]
In the vehicle display device according to the first embodiment, the following effects can be obtained.
[0023]
(1) In the vehicular display device 1 that projects the image of the display 3 onto the front window 5 of the vehicle through the magnifying glass 4 and displays it as a virtual image, the concealment mask 33 that forms the peripheral shape of the image is distorted in advance. Since such a shape is provided, a special image processing circuit for correcting distortion or a correction lens is not required, and both distortion correction and high magnification can be achieved at low cost.
[0024]
(2) The image of the display 3 is formed in a substantially rectangular shape, and the concealment mask 33 distorted so as to cover the periphery of the image of the substantially rectangular display 3 is attached to the display 3. The display 3 can be used with reduced cost, and can be easily mounted, further reducing the cost.
[0025]
(Second embodiment)
[0026]
The second embodiment is an example in which the image is projected directly from the display 3 onto the front window.
[0027]
That is, as shown in FIG. 4, light is emitted from the light source 2 to the display 3, and is directly projected from the display 3 to the front window 5 without passing through the magnifying glass 4. The other configuration is the same as that of the first embodiment, and the description is omitted.
Even when the image is projected directly on the front window 5 from the display 3 as in the vehicle display device of the second embodiment, the image distortion due to the curved surface of the front window 5 can be corrected.
[0028]
As described above, the vehicle display device 1 of the present invention has been described based on the first embodiment and the second embodiment. However, the specific configuration is not limited to these embodiments, and the scope of the claims is not limited thereto. Changes and additions to the design are permitted without departing from the gist of the claimed invention.
[0029]
For example, in the first embodiment, the image is displayed on the front window, but may be displayed on a separate combiner or the like.
Further, the image peripheral frame may be provided separately from the liquid crystal display unit as in the mask for concealment of the first embodiment, or may be provided integrally with the liquid crystal display unit.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a display device of a vehicle display device according to a first embodiment.
FIG. 2 is an explanatory diagram of an image displayed on a front window by the vehicle display device of the first embodiment.
FIG. 3 is a schematic view of the vehicle display device of the first embodiment.
FIG. 4 is a schematic view of a vehicle display device according to a second embodiment.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 vehicle display device 2 light source 3 display 31 circuit board 32 liquid crystal display unit 321 image margin 33 concealment mask 4 magnifying mirror 5 front window 60 (no correction displayed on front window) display image 601 (uncorrected display image ) Image rim 61 Image 611 (corrected displayed on the front window) Image rim A1 (of the corrected display image) Sight line A2 (when looking outside during running) Sight line h (when looking at the head-up display) Man

Claims (2)

In a vehicular display device that projects an image of a display unit directly or through a magnifying glass onto a front window of a car and displays the image as a virtual image,
A display device for a vehicle, wherein an image peripheral frame for forming a peripheral shape of an image is provided to have a shape distorted in advance. The vehicle display device according to claim 1,
A display device for a vehicle, wherein the image of the display unit is formed in a substantially rectangular shape, and an image peripheral frame distorted so as to cover the periphery of the image of the substantially rectangular display unit is attached to the display unit. .

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