JP2007081635A - Display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology whereby a display is as if to be viewed at a position remoter than the actual position of a display apparatus 10. <P>SOLUTION: The display apparatus 10 displays a left-eye image entering a left-eye and a right-eye image entering a right-eye in a different way. A viewer recognizes both the images to be a pseudo image. The distance of the pseudo image 12 from the viewer can be located at a position remoter than the actual position of the display apparatus 10 consecutively for a time by properly setting a deviation between the left-eye image and the right-eye image. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device that makes a left-eye image entering a left eye different from a right-eye image entering a right eye and recognizes both images as one pseudo image.

  Conventionally, various display devices such as a cathode ray tube (CRT), a liquid crystal (LCD), an organic EL (electroluminescence), a rear pro (rear projection), and a plasma are known. Among these, LCDs are widely used as small display devices for portable use, and organic EL displays are also being used.

  Here, in a head-up display or the like that performs various displays on the windshield glass of a vehicle, the display position is required to be positioned forward to some extent in accordance with the driver's viewpoint, and the optical path length until projection onto the windshield glass is required. To achieve this.

  On the other hand, Patent Document 1 proposes a 3D display device that recognizes a stereoscopic image by making the left eye image entering the eye different from the right eye image entering the right eye and combining both images. According to such a 3D display device, it is possible to display an image that protrudes from the screen and to enjoy a realistic image.

Japanese Patent No. 3096613

  As described above, the conventional display device is basically based on 2D display, and is based on the premise that the image displayed on the display surface is recognized by the observer. On the other hand, in a display device for 3D display, an image different from 2D display is obtained by partially and dynamically changing the display position of the image such as an image popping out.

  However, there are various requests for display, and the head-up display also has a request to display images as far away from the driver as possible in order to minimize the movement of the viewpoint during exercise. Therefore, a display device that can meet such a demand is also desired.

  The present invention is a display device that displays an image for the left eye that enters the left eye and an image for the right eye that enters the right eye, and displays one pseudo image by combining both images. It is characterized by being positioned for a continuous time at a position far from the position of the display.

  Also, the point where the pseudo image is located is A ′, the center of the left and right eyes of the observer is B and C, the angle formed by them is the convergence angle BA′C, and the convergence angle BAC for the point A on the actual display. In this case, it is preferable to display the images for the right eye and the left eye for which the convergence angle BA′C is smaller than the convergence angle BAC for a continuous time.

  Further, it is preferable that the convergence angle BA′C is always smaller than the convergence angle BAC.

  Further, it is preferable that the pseudo image is located at a location far from the actual display position by an equal distance as a whole.

  In addition, the input video signal is converted into a video signal that is a left-eye image entering the left eye and a right-eye image entering the right eye and formed by combining both images, and is supplied to the display. Is preferred.

  In addition, the ratio b / a of the vertical length a and the horizontal length b of the display area of the display is determined in the vertical direction of the display area of the pseudo image that is pseudo-recognized by combining the right eye image and the left eye image. It is preferable that the ratio is greater than the ratio b ′ / a ′ of the length a ′ and the lateral length b ′.

  Further, it is preferable that b ′ / a ′, which is the ratio of the pseudo images, satisfies 4/3 <b ′ / a ′ <16/9.

  In addition, it is preferable that b / a, which is a ratio of display areas displayed on the actual display, satisfies 16/9 <b.

  Further, it is preferable that a = c × a ′ and b = c × b ′ + d are satisfied when c is an arbitrary constant and d is 2 cm <d <10 cm.

  In addition, it is preferable that the actual display is displayed on the windshield glass of the vehicle.

  In addition, it is preferable that the display on the actual display is directly viewed by the observer.

  Thus, in the present invention, the convergence angle BA'C is set smaller than the convergence angle BAC. Therefore, a distant display can be performed using a narrow space. For example, in a vehicle head-up display system, in order to make the image displayed on the windshield glass far away from the driver, the video path to the windshield glass is extended using a mirror or the like. However, according to the present embodiment, even if the path is shortened, the projected pseudo image can be located far away, and almost the same effect as that obtained when the image is far away can be obtained.

  Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a conceptual configuration diagram illustrating the principle of the present embodiment. The display device 10 displays a video corresponding to the video signal. In this example, the display device 10 is a liquid crystal display (LCD), and displays a video signal composed of an image signal for each pixel for each pixel arranged in a matrix. Each pixel is composed of RGB or RGBW pixels, and display is performed by controlling voltage application to the liquid crystal for each pixel.

  Here, in this display device 10, 2D display is basically performed, but the display location of the image recognized by the observer is controlled not to the surface of the display device 10 but to the position of the pseudo image 12 at a farther position. The On the other hand, in the normal 3D display, the projected image is the main, and a realistic feeling is obtained by changing the pseudo display position partially at any time. It is set to a position far from the 10 position.

  That is, according to the present embodiment, an optical filter for the left eye image entering the left eye and the right eye image entering the right eye is formed for each display pixel. Accordingly, a certain pixel displays a left-eye image, the image is supplied to the observer's left eye, an adjacent pixel displays a right-eye image, and the image is supplied to the observer's right eye. Accordingly, the left-eye image formed by the left-eye pixels is recognized by the observer's left eye, and the right-eye image formed by the right-eye pixels is recognized by the observer's right eye. The position of the pseudo image recognized by the observer by combining the left-eye image and the right-eye image is set to a position far from the position of the display device 10 as a whole.

  This is an angle (convergence angle) BA formed by a specific point A ′ at a position of the pseudo image 12 formed by the left-eye image and the right-eye image and the centers of the left and right eyes of the observer B and C, respectively. This is realized by creating the left-eye image and the right-eye image so that 'C becomes smaller than the convergence angle BAC for the point A on the actual display device 10. The creation of such left and right eye images is very simple compared to creating a normal 3D image, because it is only necessary to convert the pseudo image so that all the points on the screen are positioned at a certain location. It can be carried out. In other words, all the pixels may be set so that the left-eye image and the pseudo-image formed by the right-eye image are located at a point far from the preset observer.

  Thus, in the present embodiment, the convergence angle BA′C is always smaller than the convergence angle BAC. Therefore, a distant display can be performed using a narrow space. For example, in a vehicle head-up display system, in order to make the image displayed on the windshield glass far away from the driver, the video path to the windshield glass is extended using a mirror or the like. However, according to the present embodiment, even if the path is shortened, the projected pseudo image can be located far away, and almost the same effect as that obtained when the image is far away can be obtained.

  Further, as shown in FIG. 1, the pseudo image is located behind the display device 10. Therefore, the display device 10 is displayed as a window, and the pseudo image is larger than the display device 10 as shown in the figure. Therefore, the image viewed by the observer is farther and larger than that displayed on the display device 10. For this reason, a large screen similar to the projector can be obtained in a pseudo manner with a small display. Furthermore, even in a state where a small screen is held in the hand, a large screen can be seen relatively far away, and it is difficult to see a nearby small image.

  Here, FIGS. 2A and 2B show the aspect ratio of the display image on the display device 10 and the display image in the pseudo image 12. As described above, when the aspect ratio a / b of the display device 10 is compared with the aspect ratio a ′ / b ′ of the pseudo image, the aspect ratio a / b of the display device is larger. As shown in FIG. 2 (c), the horizontal direction is limited to the point where the display device 10 becomes a window with respect to both the right eye and the left eye of the observer, and the vertical direction in which such a restriction does not occur. This is because the expansion width is smaller than that.

  Therefore, the ratio b / a of the vertical length a and the horizontal length b of the display area of the display device 10 is determined so that the right eye image and the left eye image are combined and the pseudo image display area is vertically recognized. It becomes larger than the ratio b ′ / a ′ of the length a ′ in the direction and the length b ′ in the horizontal direction.

  The video to be displayed by the television signal has an aspect ratio of 4/3 or 16/9. Therefore, in the pseudo image viewed by the viewer, the aspect ratio b '/ a' is also 4/3 or 16/9. When b '/ a' is 4/3, it is preferable that the aspect ratio b / a of the actual display satisfies 4/3 <b / a. Further, when displaying an image having b '/ a' of 16/9, it is preferable that 16/9 <b / a is satisfied. Thereby, display based on a general television signal can be performed efficiently.

  Further, the ratio between the display area of the display device 10 and the size of the pseudo image is determined by how far the pseudo image is set. If the enlargement ratio is 1 / c, basically a = c × a The relationship “, b = c × b” should hold. However, as described above, there is a limit according to the distance between the eyes of the observer. When the distance d between the eyes is 2 cm <d <10 cm, a = c × a ′, b = c × b The relationship “+ d” holds.

  Here, the formation of the left-eye image and the right-eye image will be briefly described. It is known that an observer wears special glasses so that the left eye image can be seen only by the left eye and the right eye image can be seen only by the right eye. Special glasses include high-speed shutters, and the left and right images can be viewed separately by synchronizing the display and the shutter. In addition, there is a parallax barrier type that separately displays left and right images without requiring special glasses. This is to allow only the left-eye image or the right-eye image to be seen from the left and right viewpoints of the observer by the parallax barrier.

  Further, Patent Document 1 discloses a filter that uses a principle similar to that of a parallax barrier and has a pixel arrangement of a right-eye image and a left-eye image in a display unit in a zigzag shape (checkered flag shape) and is arranged in front of the display unit It is assumed that the openings are located in a staggered manner corresponding to the pixels. The filter allows two pixels to be seen from the opening, so that the right-eye pixel can be seen from the right eye and the left-eye pixel can be seen from the left eye. As a result, it is possible to prevent the occurrence of unnecessary vertical stripes by preventing a decrease in the number of pixel columns in the horizontal direction.

  In the present embodiment, the convergence angle in display is controlled using the stereoscopic display method described in Patent Document 1.

  Moreover, it is also suitable to use the display apparatus of this embodiment for the head-up display system of a vehicle.

  As shown in FIG. 3A, the display device 10 of this embodiment is installed in front of the windshield glass 20 of the vehicle. For example, the position may be relatively close to the windshield glass 20 such as on a dashboard. Then, the left eye image and the right eye image are displayed on the display device 10 as described above. As a result, the virtual image 22 of the display device 10 is displayed in front of the windshield glass 20, and this virtual image 22 is substantially the same as the display of the display device 10 (in the case of FIG. 3, upside down). Therefore, an observer (usually a driver) in the passenger compartment sees the left-eye image and the right-eye image in the virtual image 22 with the left eye and the right eye, respectively, so that the pseudo image 24 is further determined by these images. Become position.

  As described above, according to the present embodiment, the original virtual image 22 is formed as separate images for the right eye and the left eye even when the distance to the windshield glass 20 of the vehicle is shortened. The position of the pseudo image 24 is further distant. Therefore, the display device 10 can be arranged near the windshield glass 20, and the degree of freedom of the arrangement location is increased. In addition, as shown in FIG. 3B, the image projected on the windshield glass can be enlarged by reflecting the image on the concave mirror 26.

  FIG. 4 is a block diagram showing the configuration of video signal processing. A video signal of a predetermined format such as NTSC is supplied to the signal processing circuit 30. In the signal processing circuit 30, a video signal to be displayed on each pixel of the display device 10 is created. At this time, the signal processing circuit 30 creates a left-eye video signal and a right-eye video signal from one video signal corresponding to a predetermined convergence angle. The convergence angle data may be supplied as a position adjustment signal from the outside, but may be stored internally as a constant value. Then, a display video signal is created by alternately positioning the obtained left-eye video signal and right-eye video signal for each pixel. That is, in the pixels of one horizontal line, the left-eye pixels and the right-eye pixels are alternately positioned, and the left-eye pixels and the right-eye pixels are alternately positioned in the column direction. Actually, the video signal is color, and the left-eye image and the right-eye image are alternately arranged for each RGB.

  Further, if the user can input the position adjustment signal using a knob or the like provided on the display device 10, the pseudo image position can be adjusted to a desired one. Note that this position adjustment is performed by adjusting the convergence angle by adjusting the amount of positional deviation between the right eye image and the left eye image.

  The display device 10 is preferably a liquid crystal display device, but any conventionally known display device such as an organic EL display device, a CRT, a rear projector, or a plasma display device can be used.

  Moreover, in the said embodiment, although the display position of the pseudo image was always a fixed position, you may make it changeable as needed. Furthermore, the position of the pseudo image may be basically set to a position far from the position of the display device 10, and a 3D image may be displayed on the assumption.

It is a figure explaining the principle of embodiment. It is a figure which shows the display of a display apparatus, and the display of a pseudo image. It is a figure which shows the structure at the time of adapting to a head-up display system. It is a figure which shows the structure of a process of a video signal.

Explanation of symbols

  10 display device, 12, 24 pseudo image, 20 windshield glass, 22 virtual image.

Claims (11)

A display device that displays a left-eye image that enters the left eye and a right-eye image that enters the right eye, and displays one pseudo image by combining both images,
A display device characterized in that a distance from an observer of a pseudo image is positioned at a position far from an actual display position for a continuous time. In a display device that displays an image for the left eye that enters the left eye and an image for the right eye that enters the right eye, and displays one pseudo image by combining both images,
The point at which the position of the pseudo image is located is A ′, the centers of the left and right eyes of the observer are B and C, the angle formed by them is the convergence angle BA′C, and the convergence angle BAC for the point A on the actual display. In this case, a display device that displays images for the right eye and the left eye for which the convergence angle BA′C is smaller than the convergence angle BAC for a continuous time. The display device according to claim 1 or 2,
The display device characterized in that the convergence angle BA′C is always smaller than the convergence angle BAC. In the display apparatus as described in any one of Claims 1-3,
The display device according to claim 1, wherein the pseudo image is located at a location far from the actual display position by an equal distance as a whole. In the display device according to any one of claims 1 to 4,
The input video signal is a left-eye image entering the left eye and a right-eye image entering the right eye, and the image formed by combining both images is converted to a video signal located at a position farther from the display and supplied to the display. A display device. In the display apparatus as described in any one of Claims 1-5,
The ratio b / a of the vertical length a and the horizontal length b of the display area of the display is the vertical length of the display area of the pseudo image that is pseudo-recognized by combining the right eye image and the left eye image. A display device characterized by being larger than a ratio b ′ / a ′ between a ′ and a lateral length b ′. In the display apparatus as described in any one of Claims 1-6,
B / a which is a ratio of display areas in display on the actual display satisfies 4/3 <b / a <16/9. In the display apparatus as described in any one of Claims 1-6,
B / a which is a ratio of display areas in display on the actual display satisfies 16/9 <b / a. The display device according to any one of claims 6 to 8,
A display device characterized by satisfying a = c × a ′, b = c × b ′ + d, 2 cm <d <10 cm, where c is an arbitrary constant. The display device according to any one of claims 1 to 9,
An actual display is displayed on a windshield glass of a vehicle. The display device according to any one of claims 1 to 9,
A display device, wherein an actual display is directly viewed by an observer.

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