JP2000305554A - Display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high image quality by using a display device efficiently. SOLUTION: When a display image plane on a display device 4 and a projected image 34 have different aspect ratios, an original image 11 is electrically enlarged with horizontal and vertical magnitudes different from each other such that only a projected region 35 displayed as the projected image 34 from the original image 11 is displayed on an entire display screen of the display device 4, and a deformed display image 36 displayed on the entire display image plane of the display device 4 is optically enlarged and restored with horizontal and vertical magnitudes different from each other such that the total magnitudes of the projected image 34 against the original image 11 in vertical and horizontal directions are equal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display method.

[0002]

2. Description of the Related Art Conventionally, there has been known a display device such as a head-up display device for a vehicle which presents image information such as characters and graphics in front of a windshield of a vehicle such as an automobile so as to be superimposed on a scene. As this type of head-up display device, for example, a configuration shown in FIG. 3 is known.

In FIG. 3, reference numeral 1 denotes an instrument panel, and 2 denotes a windshield of a vehicle. A projector 3 is provided in the instrument panel 1. The projector 3 is a display 4 for displaying driving information of a vehicle, images such as images and characters sent from external devices such as a camera, navigation, and ViCS.
including. The display 4 is, for example, a liquid crystal panel (LCD)
Etc.

On the other hand, a combiner 5 is formed on the windshield 2 of the vehicle as a semi-transmissive reflective surface having a reflectivity of, for example, 25% to 50% by coating or the like.

The projector 3 includes a magnifying optical system 6 and a concave mirror as a reflecting mirror.
An image such as a video is reflected by the concave mirror and is guided to the combiner 5 through a transparent cover 7 for preventing dust. In addition,
As the magnifying optical system 6 and the reflecting mirror, a combination of a lens and a plane reflecting mirror may be used instead of the concave mirror.

The image is reflected by the combiner 5 in a direction in which the eyes of the occupant, for example, the driver are present.

[0007] The occupant, as the image 8 shows, is as if in front of the driver's seat, that is, the windshield 2 of the vehicle.
The image is superimposed on the scenery and viewed as if it were in front of. That is, a virtual image 8 of an image is formed in front of the windshield 2 of the vehicle.

Here, since the display 4 such as a liquid crystal panel is a ready-made product and has a predetermined size, an image to be finally projected on the portion of the windshield 2 (hereinafter referred to as a projected image 8) ) And the display screen of the display device 4 may not have the same aspect ratio.

Conventionally, as shown in FIG. 4, when a part of the original image 11 sent from an external device is projected on the windshield 2, first, the original image 11 shown in FIG. 11 is displayed on the entire display 4 such as a liquid crystal panel (display image 12 in FIG. 4B). At this time, the display 4
In the display area 1 having the same aspect ratio as the projection image 8.
3 and the other non-display area 14, the non-display area 14 physically has the masking 1 as shown in FIG.
5 is applied. In the case of FIG. 4, the display 4 is arranged horizontally long, and the masking 15 is provided on the right side of the display 4.

Then, the display image 12 projected on the display area 13 of the display 4 is optically magnified both vertically and horizontally by the magnifying optical system 6 and magnified and projected to a desired size as shown in FIG. Let it do.

[0011]

However, such a conventional display device as a head-up display has a problem that sufficient image quality cannot be obtained.

This is for the following reason. That is, the display 4
When the aspect ratio is different between the display screen of FIG. 1 and the projected image 8 on the windshield 2, physical masking 15 is performed on the remaining non-display area 14 where the display area 13 of the display 4 is secured, and the masking 15 portion is formed. Although the projection is not performed, masking 15 on the display 4 such as a liquid crystal panel in this way means that the resolution (number of pixels) originally possessed by the display 4 such as a liquid crystal panel is reduced and used. Display 4 such as a liquid crystal panel.
Is not fully utilized.

When used as a display device such as a head-up display for a vehicle, the windshield 2 has a relatively large curvature in the horizontal direction as shown in FIG. Since the corners (ends on both sides) of the windshield 2 on which the display image of the head-up display is projected have the largest curvature (small radius of curvature), the distortion is conspicuous when the magnification is increased by the horizontal optical system at a high magnification. Become.

An object of the present invention is to solve the above-mentioned problems and to provide a display method capable of obtaining high image quality by effectively utilizing a display.

[0015]

According to the first aspect of the present invention, an original image is displayed on a display, and the display image displayed on the display is optically enlarged and projected. In a display method in which a projection image is obtained by using a display device, when the display screen and the projection image have different aspect ratios,
The original image is electrically enlarged at different vertical and horizontal magnifications so that only the projection range of the original image that is to be projected as a projected image is projected on the entire display screen of the display unit, and the entire display screen of the display unit is enlarged. It is characterized in that the projected deformed display image is optically enlarged and restored at different magnifications in the vertical and horizontal directions so that the total aspect ratio of the projected image with respect to the original image becomes the same.

According to the first aspect of the present invention, a projected image having a resolution enlarged by an optically small magnification can be obtained by using all the dots of the display device. Thus, a projection image with remarkably high resolution and good image quality can be obtained as compared with a case where a part of the dots of the display device are used to enlarge the image at an optically large magnification.

In particular, when the windshield is used as a display device such as a head-up display for a vehicle, the windshield has a relatively large curvature in the horizontal direction. In particular, the corner of the windshield has the largest curvature ( (The radius of curvature is small.) Even in the case of projecting on the corner of the windshield, the enlargement in the horizontal direction is performed by combining the enlargement of the optical system and the electrical enlargement of the display, thereby enlarging the optical system. The rate can be reduced, the occurrence of distortion can be suppressed, and the image quality of the projected image can be significantly improved.

[0018]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. The same or equivalent parts as those of the conventional example will be described with the same reference numerals.

In the first embodiment, an example in which the present invention is applied to a display device such as a head-up display device for a vehicle will be described. The head-up display device is shown in FIG.
Is basically the same as the above, but differs in the following points.

First, as shown in FIG. 2, a display driving device 21 for driving a display 4 such as a liquid crystal panel includes a display 4.
Drive unit 23 such as a liquid crystal drive IC that sends drive signal 22 to
And an image I for transmitting a signal of the original image 11 from the camera, an external device such as navigation or ViCS to the display 4.
An image storage section 25 such as C and a power supply circuit section 28 for supplying a power supply 27 to these sections are provided. The drive unit 23 includes a magnification setting circuit 31 (dot frequency setting circuit) such as a PLL circuit including a resistor 29 and a coil 30. The horizontal electric magnification can be adjusted separately.

In the magnifying optical system, a concave mirror or a magnifying lens having different magnifications in the vertical and horizontal directions is used.

According to the first embodiment, as shown in FIG. 1, when the display screen of the display 4 such as a liquid crystal panel and the projected image 34 on the windshield 2 have different aspect ratios, an external As shown in FIG. 1 (c), only the projection range 35 (FIG. 1 (b)) of the original image 11 (FIG. 1 (a)) sent from the device or the like is to be projected as the projection image 34. Then, the original image 11 is electrically enlarged at different magnifications in the vertical and horizontal directions by using the magnification setting circuit 31 of the display 4 so as to be displayed on the entire display screen of the display 4. That is, only the lateral direction is electrically enlarged.

Next, a transformed display image 36, which is enlarged at different magnifications in the vertical and horizontal directions, so that only the projection range 35 is displayed on the entire display screen of the display device 4 such as a liquid crystal panel, is transformed into the original image 11
1 is optically enlarged and restored at magnifications different in the vertical and horizontal directions using a magnifying optical system such as a concave mirror so that the total magnification of the projected image 34 becomes equal to the vertical and horizontal magnifications, as shown in FIG. The projection image 34 is projected on the glass 2.

By doing so, a projected image 34 having a resolution optically enlarged at a small magnification using all the dots of the display 4 can be obtained. It is possible to obtain a projection image 34 having a remarkably high resolution and a high image quality as compared with the case where the dots are used to enlarge the image optically at a large magnification.

In particular, when used as a display device such as a head-up display for a vehicle, the windshield 2
Is provided with a relatively large curvature in the horizontal direction. Particularly, since the corner of the windshield 2 has the largest curvature (the radius of curvature is small), it is necessary to project the light onto the corner of the windshield 2. However, the image quality of the projection image 34 can be remarkably improved by increasing the display capability in the horizontal direction.

More specifically, when the original image 11 is enlarged by 1 in both the vertical and horizontal directions, the vertical size of the display 4 such as a liquid crystal panel and the vertical size of the original image 11 coincide with each other. 480 dots of the display 4 such as a liquid crystal panel having 600 dots in the direction correspond to the horizontal size of the projection range 35, and all the vertical dots of the display 4 correspond to the vertical size of the projection range 35. If they correspond, the magnification setting circuit 3
In step 1, the original image 11 is electrically enlarged 1.25 times in the horizontal direction, and the projection range 35 is extended in the horizontal direction so that only the projection range 35 is projected on all 600 dots. To do so, the horizontal dot frequency may be changed from 480 dots to 600 dots by changing the impedance of the coil 30 of the magnification setting circuit 31.

Next, the deformed display image 36 expanded 1.25 times in the horizontal direction is optically expanded 4 times in width and 5 times in height by an enlargement optical system, and the projection image 34 is totally compared with the original image 11. To magnify the image so that it becomes 5 times vertically and 5 times horizontally.

In this manner, in the horizontal direction, a projection image 34 having a resolution of optically quadrupling 600 dots can be obtained. As a result, it is possible to obtain a projection image 34 having a much higher resolution and a higher image quality.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and the design may be changed without departing from the scope of the present invention. Included in this invention.

For example, the present invention is not limited to the case where the display 4 such as a liquid crystal panel is set horizontally and the original image 11 is electrically stretched in the horizontal direction. Alternatively, the original image 11 may be electrically extended vertically and horizontally at different magnifications.

[0032]

As described above, according to the first aspect of the present invention, it is possible to obtain a projection image having a resolution optically enlarged at a low magnification by using all the dots of the display. As described above, a projection image with remarkably high resolution and good image quality can be obtained as compared with a case where the display is enlarged at an optically large magnification using some dots of the display.

In particular, when the windshield is used as a display device such as a head-up display for a vehicle, the windshield has a relatively large curvature in the horizontal direction. In particular, the corner of the windshield has the largest curvature ( (The radius of curvature is small.) Even in the case of projecting on the corner of the windshield, the enlargement in the horizontal direction is performed by combining the enlargement of the optical system and the electrical enlargement of the display, thereby enlarging the optical system. The rate can be reduced, the occurrence of distortion can be suppressed, and the image quality of the projected image can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a method according to a first embodiment of the present invention;
(A) shows an original image, (b) shows a projection range of the original image, (c) shows a deformed display image, and (d) shows a projected image.

FIG. 2 is a system diagram of the display driving device of FIG. 1;

FIG. 3 is a side sectional view of the head-up display device.

FIG. 4 is a diagram showing a conventional method, wherein (a) shows an original image,
(B) shows a display area and a non-display area of the display, (c) shows a display image, and (d) shows a projection image.

FIG. 5 is a plan view of a windshield of the vehicle.

[Explanation of symbols]

 4 Display 11 Original image 34 Projected image 35 Projected range 36 Deformed display image

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Claims (1)

[Claims] 1. A display method comprising: displaying an original image on a display; and optically enlarging and projecting the display image displayed on the display to obtain a projection image. When the aspect ratio is different, the original image is electrically enlarged at different aspect ratios so that only the projection range of the original image that is to be projected as the projected image is projected on the entire display screen of the display. A display characterized by optically enlarging and restoring a deformed display image projected on the entire display screen of the display device at a different magnification in the vertical and horizontal directions so that the total aspect ratio of the projected image with respect to the original image is the same. Method.