JP2001148871A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display device of an entirely novel form that permits display of a stereoscopic video image. SOLUTION: The video display device of this invention includes left eye and right eye use display devices 1, 2 that display a video information signal, a left eye use magnification optical system 3 that is placed between a left eye and the left eye use display device and a right eye use magnification optical system 4 that is placed between a right eye and the right eye use display device. A frame supports them in a way that a virtual image on a screen that is magnified when viewing video information displayed on the right eye use display device by the right eye through the right eye use magnification optical system is generated at a distance of the virtual image from the left and right eyes and optional elements of the virtual images on the left and right screens are coincident over the entire screen when the left and right eyes are directed to the virtual image on the screen so that the optical positional relation in congestion at a congestion angle depending on the distance D of the virtual image can be maintained. Displaying left and right video signals generated on the basis of the principles of stereoscopic indication by both-eye parallax on the left eye and right eye display devices allows a stereoscopic vision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device capable of enlarging a display of a display terminal (VDT) for displaying a video signal and further enabling a stereoscopic view.

[0002]

2. Description of the Related Art In a video display device such as a home television receiver, a VDT is generally placed on a floor or a table, and one screen is generally viewed from a distance. In recent years, lightweight and portable objects such as television receivers using liquid crystal displays have also become widespread, but there is no change in viewing one screen with both eyes.

[0003]

The above-mentioned conventional video display device inherently has the following disadvantages. (1) When viewing a stationary video display device, the user must fix his / her gaze on the video display device, and is tired of keeping the same posture for a long time. Also, when the body posture is changed, the posture is likely to be unnatural because it is adjusted to the fixed video display device. (2) In a portable video display device, the above-mentioned burden is reduced by changing the position of the device. However, since there are restrictions on where the video display device can be placed, for example, if you want to lie on your back and look at the screen,
You need to hold the device with your arms. Holding the device with your arm now makes your arm tired. (3) In general, the screen size is not so large because a portable video display device needs to be lightweight. Therefore, it is not possible to enjoy a powerful large image. (4) There is usually a shared space with others between the video display device and the human eye. For this reason, when watching the video, there is a case where a sense of discomfort is given to others. Also, it is difficult to keep the confidentiality of the video. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a video display device of a completely new type capable of displaying a stereoscopic image based on its special features.

[0004]

According to a first aspect of the present invention, there is provided a display apparatus for displaying a video information signal, comprising: a display for a left eye and a display for a right eye; Magnifying optical system for the left eye arranged between displays for the eye, magnifying optical system for the right eye arranged between the right eye and the display for the right eye, the display and the magnifying optical system When the same image information is displayed on the left-eye display and the right-eye display, the image information displayed on the left-eye display is enlarged by the left eye through the left-eye enlargement optical system. The virtual image of the screen and the image information displayed on the display for the right eye, the virtual image of the enlarged screen viewed with the right eye through the magnifying optical system for the right eye, the virtual image from the left and right eyes To be generated at the distance, and When the right eye is pointed at the virtual image of each screen, the optical position relationship converges to the convergence angle determined by the distance of the virtual image so that any corresponding element of the virtual image of the left and right screens coincides with the entire screen. And a frame adapted to be supported.

[0005] In the video display apparatus, it is possible to perform stereoscopic viewing by displaying left and right video signals generated based on the principle of stereoscopic display based on binocular parallax on the left and right eye displays. it can.

[0006] By mounting the device corresponding to both eyes, a user can watch a television image on a large screen with the confidentiality of the content without being restricted by the posture of the body. Further, in the video display device,
Left and right video signals generated based on the principle of stereoscopic display by binocular parallax can be displayed on the left and right displays for stereoscopic viewing. Further, in the video display device, a half mirror is further provided between the magnifying lens and the eye, a magnifying lens and a display are arranged on a reflection side of the half mirror, and a light amount emitted from the display is switched or adjusted, and And the outside scene seen through the half mirror can be switched or superimposed at the same time. Further, in the video display device, a shutter is provided between the half mirror and the outside scene at least in the transmission direction of the half mirror, and even when the outside brightness is brighter than the amount of light emitted from the display, the shutter is closed. By blocking the transmitted light of the half mirror, only the image displayed on the display can be viewed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings and the like. FIG. 1 is a schematic diagram illustrating the principle of a video display device according to the present invention. Now, it is assumed that the same liquid crystal display is displayed on the two liquid crystal displays 1 and 2. First,
The right magnifying lens 4 is placed between the liquid crystal display 2 for the right eye and the right eye 6 at a position where the distance between the liquid crystal display and the magnifying lens is u and the distance between the magnifying lens and the right eye is t. On the screen on the liquid crystal display, a magnified virtual image 8 magnified by the magnifying lens is generated at a position D away from the right eye.

Similarly, a magnifying lens 3 for the left is placed between the liquid crystal display 1 for the left eye and the left eye 5 at a position where the distance between the liquid crystal display and the magnifying lens is u and the distance between the magnifying lens and the left eye is t. Put. On the screen on the liquid crystal display, a magnified virtual image 7 magnified by the magnifying lens is generated at a position D away from the left eye. Set both focal lengths of the left and right magnifying lenses to f
Then, the following relationship is established among D, u, t, and f according to the lens formula. 1 / f = −1 / (D−t) + 1 / u (1) When the image magnification of the magnifying lens is m, m = (D−t) / u (2) de (usually 58mm to 72m
m, average 65 mm, Japanese average 62 mm). It is known that this interocular distance plays a very important role in obtaining positional information of an object. When a human gazes at an object that is D away from the eye, binocular convergence is performed by adjusting the focus of the eye to the distance of D and pointing the optical axes of both eyes to the object. By linking the focus adjustment and the binocular convergence, images obtained from both eyes are processed at the cerebral center without burdening the eyes.

Now, consider the case where the center of the screen of the liquid crystal display is aligned with the optical axis of the lens as shown in FIG. At this time, since the focus adjustment of the eye adjusts the distance from the eye to D, the convergence angle is 0 °, that is, infinity, so that there is an extreme shift between the two, causing a sense of incongruity.
Next, a case where the optical axis of the lens is converged as shown in FIG. At this time, at the center of the screen, both the focus adjustment and the angle of convergence match the distance D to the eyes, but the left and right images are shifted at the edge of the screen. When the screen size is large or D is small, fusion processing in the cerebral center becomes difficult, and double images and visual field conflict occur. In addition, even if the fusion processing is performed well, a burden is imposed on the eyes.

Therefore, consider a case where there is an imaging plane where left and right enlarged virtual images coincide with each other at a distance of D from the eye as shown in FIG. At this time, the optical axes of the left and right lenses are separated by de on the image plane. Conversely, to achieve this, the optical axis of the lens may be adjusted to a point de / 2m = de · u / 2 (Dt) away from the center of the screen of the liquid crystal display in the horizontal direction. If the left and right liquid crystal displays and the left and right magnifying lenses are arranged to satisfy this condition, it looks as if one large screen is placed at a position D away from the eyes. For example, when looking at the center of the screen of the liquid crystal display, the left and right eyes focus on the center of the enlarged virtual image separated by D from the eyes, and are convergence at the convergence angle θ. In this state, since the focus adjustment and the binocular convergence are reasonably linked, the fusion process in the cerebral center is performed without putting a burden on the eyes.

Next, with reference to FIG.
Based on the display principle, the left and right video signals
The creation will be described along with an actual example. In the manner shown in FIG.
The two video signals that have been captured are converted as shown in FIG.
Separate left and right LCD displays for video display
Let's consider the case of displaying them individually. As shown in FIG.
Assume that there are bodies Pa and Pb. Now, only D away from my eyes
Plane (reference plane surrounded by image frame) 7_L , 8
_R think of. Reference surface 7_L , 8_R Is completely overlapping in the front space
This is a virtual reference plane. At this time, instead of eyes,
Convex lenses 5 _L , 6_R Replaced with image sensors 9 and 10
To a video signal corresponding to an image on the retina.

Next, when this video signal is displayed on the video display device as shown in FIG. 1 so as to correspond to the left and right, the objects Pa and Pb are stereoscopically displayed as if they were at that position. This is based on the principle of binocular parallax, and looks three-dimensional due to the difference in convergence angle with respect to the objects Pa and Pb.

Next, as shown in FIG. 3B, consider the same reference planes 7 _L and 8 _R as described above, which are separated from the eye by 2D. Then, instead of the eyes, the two convex lenses 5 _L and 6 _R and the image sensors 9 and 10 are used to convert the image into a video signal corresponding to an image on the retina. The video signals of two left and right images based on the luminous flux reaching each of the image sensors 9 and 10 equivalent to those passing through the reference plane or generated from the reference plane are displayed in a video display device as shown in FIG. Then, the entire positional relationship between the objects Pa and Pb appears to be reduced to １ ／. This is equivalent to zooming up. In this way, zooming of a stereoscopic image is possible.

When the video display device of the present invention is used for the above-described reason, even a liquid crystal display having a small screen size can be viewed large without any burden on the eyes, and a three-dimensional display is possible. FIG. 4 is a front view, a side view, and a plan view of the first embodiment of the present invention. The two liquid crystal displays 21 and the two magnifying lenses 22 are arranged at optical positions as shown in FIG. In this device, a white acrylic plate 24 is provided behind the liquid crystal plate so that external light can be taken in through the liquid crystal plate in order to view the liquid crystal display using natural light. A liquid crystal drive circuit board 25 is mounted on the upper and lower sides of the main frame 23, and a signal processing board 26 is mounted on the left and right side surfaces. In this embodiment, a connection cable 27 connects two video signals, a power supply, and a ground, and is connected to an external power supply adapter (not shown) and other video equipment. FIG. 5 shows a usage state in which the video display device is mounted.

Although the basic objects of the present invention can be achieved by the above-described embodiments, there is still room for improvement in the following points. (1) The image on the liquid crystal display cannot be seen at night or in a dark place because it relies on external light. (2) Since the total weight of the liquid crystal display, magnifying lens, and each substrate is received only by the head of the nose, a burden is placed on the nose. (3) The user cannot see the outside with the above-mentioned display device attached, and it is necessary to remove the display device each time.

The first problem described above can be solved by further attaching a backlight for illumination to the apparatus. However, the second problem becomes serious by the weight of the backlight. In order to solve this problem, instead of the above-mentioned eyeglass type, as shown in FIG. 6, it may be shaped just like ski goggles. In this case, since the weight of the device is distributed to the forehead and its surroundings, the cheeks, and the like, the above disadvantages 1 and 2 can be solved. However, the third problem is a problem because a display device shaped like goggles cannot be easily removed. Further, since the backlight is provided on an extension on the optical axis, the length from the eye to the end of the main frame becomes longer, which is a problem in terms of safety. Further, in the above-described embodiment, since the optical axis of the lens is on a parallel straight line, the size of the liquid crystal display is limited. This problem can be solved by using a half mirror.

FIGS. 7A and 7B are schematic diagrams showing the basic structure and optical path of each. FIG. 7A shows the eye 43 and the magnifying lens 42 while maintaining the optical position of FIG.
This is an embodiment in which a half mirror 45 is provided therebetween, and a liquid crystal display 41 and a magnifying lens are provided on the reflection side of the half mirror. At this time, a structure is adopted in which light from the outside does not leak between the liquid crystal display 41 and the half mirror 45. Now, while the backlight 44 is off, the half mirror 4
Since the reflected light of No. 5 disappears, the outside scenery can be seen with the eyes 43. Next, when the backlight 44 is turned on, the amount of reflected light from the half mirror 45 becomes larger than the amount of light transmitted through the half mirror 45 from the outside, so that the eyes 43 can see the screen of the liquid crystal display 41. However,
If the outside is extremely bright, the screen and the outside scene will overlap and appear. This problem can be solved by providing a shutter on an extension of the transmission direction of the half mirror 45, that is, between the half mirror 45 and the outside world, and closing the shutter while viewing the screen of the liquid crystal display 41 to block external light. FIG.
In the example of (a), since the screen is reflected only once by the half mirror 45, the image visible to the eyes is the liquid crystal display 41.
It looks as though the image displayed on the screen was just turned over. Therefore, in order to view a normal screen, it is necessary to devise a method such as turning over the liquid crystal plate of the liquid crystal display 41 or inverting left and right by signal processing. FIG. 7B is a schematic view showing another embodiment in which the above-mentioned problem is solved by using another mirror 46.

An embodiment of the video display device according to the present invention taking this point into consideration will be described. FIG. 8 is a plan view, a front view, and a side view of the apparatus of the embodiment. FIG. 9 is a schematic side view showing a state in which the apparatus of the embodiment is mounted. FIG.
Reference numeral 0 is a perspective view showing an arrangement of main components of the apparatus of the embodiment. As shown in FIG. 10, the optical arrangement of each component is shown in FIGS.
(B). However, the distance between the optical axes on the liquid crystal display 51 is made wider than the distance between the eyes by twisting the half mirror 54 and the mirror 56 outward while keeping them parallel. In this embodiment, the liquid crystal shutter 55 is used as a shutter. A switch 61 is a lock type that switches between ON and OFF each time the switch is pressed. Thereby, the backlight 53 and the liquid crystal shutter 5
5 is controlled.

First, when the power is off, the liquid crystal shutter 5
Since 5 is in the transmission state, the eye 62 can see the outside scenery. Next, when the power is turned on, the liquid crystal shutter 55 is turned off, and the backlight of the liquid crystal display 51 is turned on, so that the eyes can see the screen on the liquid crystal display 51. Next, when the switch 61 is pressed, the backlight is turned off and the liquid crystal shutter 55 is set in a transmissive state, so that the outside world can be seen. When the switch 61 is pressed again, the state is the same as when the power is turned on again, and the screen of the liquid crystal display 51 can be viewed.

In this embodiment, as shown in FIG. 9, the structure is such that the entire weight of the video display device is received by the entire forehead, so that the burden is reduced. In addition, the most protruding part is not on the extension of the eye, and the outside is immediately visible in an emergency, which is safe.

In each of the above-described embodiments, the explanation has been made using the liquid crystal display.
The present invention can be implemented using a flat display or other flat displays. It is also possible to overcome the roughness of the number of pixels possessed by the liquid crystal display by using three liquid crystal displays on each of the left and right sides. FIG. 11 is a cross-sectional view of still another embodiment device using three liquid crystal displays. An EL element 77 is used for the backlight. R, G, and B signals are displayed on the three liquid crystal displays 71, 72, and 73, respectively. 74, 75, 76
Are color filters of R, G and B, respectively. Unnecessary portions of the light emitted from the backlight are cut by the color filters, and the light becomes RGB light sources and enters the corresponding liquid crystal plates. The images individually displayed in the three primary colors are combined by the dichroic prism 78. When this is viewed through the magnifying lens 79, a color-displayed image is obtained. In this case, for example, even if a liquid crystal display having 100,000 pixels is used, the resolution is increased to 300,000 pixels, which is three times that of the liquid crystal display. FIG. 12 is a schematic side view showing a use state of an embodiment to which the above principle is applied. In this embodiment, the headphone 85 is also integrated with the video display device.

[0022]

As described in detail above, the video display apparatus according to the present invention comprises a display for a right eye and a display for a left eye for displaying a television signal, a magnifying lens for the right eye and a left eye, and Each display and the magnifying lens are composed of a frame that supports the left and right virtual images generated by the magnifying lens so that the left and right eyes view the screens of the left and right displays through the corresponding magnifying lenses. Therefore, the user can view the contents on a large screen with the confidentiality of the contents, without being restricted by the posture of the body, by wearing the device corresponding to both eyes.

Further, in the video display device, the left and right video signals generated based on the principle of stereoscopic display based on binocular parallax are displayed on the left and right displays so that stereoscopic viewing can be performed. Further, in the video display device, a half mirror is further provided between the magnifying lens and the eye, a magnifying lens and a display are arranged on a reflection side of the half mirror, and a light amount emitted from the display is switched or adjusted, and And the outside scene seen through the half mirror can be switched or superimposed at the same time.

In the video display device, a shutter may be provided between the half mirror and the outside scene at least in a transmission direction of the half mirror, and the shutter may be provided even when the outside brightness is brighter than the amount of light emitted from the display. By closing, the transmitted light of the half mirror is blocked, and only the image displayed on the display can be viewed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating the principle of a video display device according to the present invention.

FIG. 2a is a schematic diagram showing an example where fusion processing is likely to be difficult.

FIG. 2b is a schematic view showing another example in which fusion processing is likely to be difficult.

FIG. 3a is a schematic diagram illustrating the principle of imaging of a stereoscopic image.

FIG. 3b is a schematic diagram illustrating the principle of imaging of a stereoscopic image that can be zoomed.

FIG. 4 is a plan view, a front view, and a side view showing an embodiment of a video display device according to the present invention.

FIG. 5 is a diagram showing a use state of the apparatus of the embodiment.

FIG. 6 is a front view and a side view showing a use state of still another video display apparatus according to the embodiment of the present invention.

FIG. 7a is a diagram illustrating the principle of a video display device in which the outside can be seen.

FIG. 7b is a diagram showing the principle of still another video display device in which the outside can be seen.

FIG. 8 is a plan view, a front view, and a side view of the embodiment in which the outside can be seen.

FIG. 9 is a schematic side view showing a use state of the embodiment shown in FIG. 8;

FIG. 10 is a perspective view showing an arrangement of main components of the embodiment so that the outside can be seen.

FIG. 11 is a cross-sectional view for explaining the principle of an embodiment in which the resolution is increased by using three left and right liquid crystal displays.

FIG. 12 is a schematic side view showing a use state of the embodiment shown in FIG. 11;

[Explanation of symbols]

1, 2 Display (liquid crystal) 3, 4 Magnifying optical system (lens) 5 Left eye 6 Right eye 5 _L Left eye compatible lens 6 _R Right eye compatible lens 7, 8 Enlarged virtual image 7 _L Left eye reference plane 8 _R Right eye reference Surface 9, 10 Image sensor 21 Liquid crystal display 22 Magnifying lens 23 Main frame 24 White acrylic plate 25 Liquid crystal driving circuit board 26 Signal processing board 27 Connection cable 31 Liquid crystal display 32 Magnifying lens 33 Main frame 34 Backlight 35 Liquid crystal driving circuit board 36 Signal Processing substrate 37 Backlight drive circuit board 41 Liquid crystal display 42 Magnifying lens 43 Eye 44 Backlight 45 Half mirror 46 Mirror 51 Liquid crystal display 52 Magnifying lens 53 Backlight 54 Half mirror 55 Liquid crystal shutter 56 Mirror 57 Main frame 58 Connection cable Reference Signs List 9 liquid crystal drive circuit board 60 signal processing board 61 switch 62 eye 71 liquid crystal display (R) 72 liquid crystal display (G) 73 liquid crystal display (B) 74 color filter (R) 75 color filter (G) 76 color filter (B) 77 Backlight (EL element) 78 Dichroic prism 79 Magnifying lens 80 Eye 81 Mirror 82 Half mirror 84 Main frame 85 Headphone 86 Connection cable 87 Liquid crystal drive circuit board 88 Signal processing board

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H04N 5/64 511 H04N 5/64 511A 13/02 13/02 15/00 15/00

Claims (2)

[Claims] 1. A left-eye display and a right-eye display for displaying a video information signal; a left-eye magnifying optical system disposed between the left-eye and the left-eye display; Magnifying optical system for the right eye arranged between displays for the right eye, and the display and the magnifying optical system, when displaying the same video information on the display for the left eye and the display for the right eye respectively, The image information displayed on the display for the left eye, the virtual image of the enlarged screen viewed by the left eye through the magnifying optical system for the left eye, and the image information displayed on the display for the right eye, the right With the virtual image of the magnified screen viewed by the right eye through the magnifying optical system for the eye, to be generated at the distance of the virtual image from the left and right eyes, and when the left and right eyes are directed to the virtual image of each screen, Any corresponding elements of the virtual images of the left and right screens Match across the screen,
A video display device comprising: a frame supported by an optical positional relationship of convergence at an angle of convergence determined by the distance of the virtual image. 2. In the video display device,
The video according to claim 1, wherein left and right video signals generated based on the principle of stereoscopic display based on binocular parallax are displayed on the left-eye display and the right-eye display, respectively, to perform stereoscopic viewing. Display device.