JP2012234074A - Stereoscopic vision device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems that a conventional stereoscopic vision device is enlarged in size, thus impairing portability, and needs high cost, and that another conventional stereoscopic vision device requires liquid crystal shutter spectacles and also needs to include means for bringing an electronic circuit for driving the device and display images of a main body into frame synchronization in a wireless or wired manner, thus making the device expensive.SOLUTION: A stereoscopic image can be presented to an operator via a pair of polarizers, by using a total reflection mirror arranged in parallel with a surface of a liquid crystal display part of a flat pad type computer, a total reflection mirror arranged so as to make an angle of 45 degrees with the surface of the liquid crystal display part, and a semi-reflective mirror arranged so as to make an angle of 135 degrees with the surface of the liquid crystal display part.

Description

The present invention relates to a stereoscopic device to be mounted on a flat pad type computer or the like using a liquid crystal display.

As a stereoscopic device with appropriate price and form as consumer equipment,
a. The left and right images represented by US Pat. No. US-4281341 are displayed alternately by frame, and the shutter mounted on the glasses is driven in synchronization with the display so that the right-eye image and the left-eye image are displayed. A method of separating images,
b. In addition, as a long-known method, a lenticular lens or a parallax barrier layer is arranged on a display body that alternately displays a right-eye image and a left-eye image in units of pixels, so that both eyes can There are some that use 3D parallax to show stereoscopic images,
In the case of a., liquid crystal shutter glasses are required, and it is also necessary to provide an electronic circuit for driving the same and a means for synchronizing the display image of the main body wirelessly or by wire with a high price. Have In the case of b., in order to secure an image to be incident on both the left and right eyes, it is necessary to adjust by the observer so that the observation position does not change, and the viewing position of the observer is lost.
These two methods halve either the spatial resolution or the temporal resolution.

As a method for avoiding these problems, there is a method for stereoscopic viewing using the polarization characteristics of light, and a plurality of methods including Patent 2586490 have been proposed. In general, the left-eye view image and the right-eye view image are respectively displayed on two display bodies arranged at right angles, and the left and right images are superimposed on one image via a half mirror arranged at 45 degrees. A binocular image is analyzed with a polarizing film attached to glasses and presented to the left and right eyes. FIG. 7 illustrates a plan view of a method for combining left and right images in this method. In FIG. 7, reference numeral 41 denotes a liquid crystal display body that displays a right-eye view image 42, and 43 denotes a liquid crystal display body that displays a left-eye view image 44. Both linear polarization axes form 45 degrees with the vertical line. . Reference numeral 45 denotes a half mirror that causes a mirror image 46 of the right-eye view image 42 to appear at substantially the same position as the left-eye view image 44. These images are observed by an observer 50 through glasses 49 holding a polarizing plate 47 whose polarization axis forms 45 degrees with the vertical line and a polarizing plate 48 whose polarization axis forms 135 degrees with the vertical line. The two polarizing plates 48 and 49 make a pair in which the polarization characteristics are orthogonal to each other. In this way, the left-eye view image is presented exclusively to the left eye of the observer, and the right-eye view image is presented exclusively to the observer's right eye to realize stereoscopic viewing. In the case of this method, both the spatial resolution and the temporal resolution can hold the current resolution of the left and right eye images.

As polarization characteristics of the polarizing plates 48 and 49, linearly polarized light or circularly polarized light is used. The pair of polarization characteristics orthogonal to each other refers to a pair in which the polarization axes are orthogonal to each other in the case of linearly polarized light, and refers to a pair consisting of a right turn and a left turn in the case of circular polarization.

Patent Publication No. 2586490

"3D Principle" Nakahara Machine Design Office homepage (URL http://www2.aimnet.ne.jp/nakahara/3dart/3genri.html)

According to the technique using the semi-reflecting mirror and the two-line display device, the liquid crystal display device and two signal processing functions are required as shown in FIG. There is a problem that the size and weight are excessive and the portability is impaired.

In order to solve the above problems, the first invention is to divide a liquid crystal display into two parts, and display a right-eye view image on one side and a left-eye view image on the other side. In addition, a mirror image of the right-eye view image is presented to the operator through a total reflection mirror arranged at 45 degrees with the surface of the display. In addition, a total reflection mirror arranged in parallel with the display surface is disposed at a position one-half the long side of the display surface from the display surface to realize a mirror image of the left-eye view image, and A stereoscopic device characterized in that a mirror image of the left-eye view image is reflected by a semi-reflecting mirror arranged so as to form 135 degrees with a surface and presented to an operator through a pair of polarizing plates.
In addition, the second invention receives a distributed moving image such as YouTube or a stereoscopic moving image file stored in a storage device, and the right-eye view image is rotated 90 degrees after being turned upside down and reduced in the right half of the display. The stereoscopic image device is provided with an image signal conversion function that outputs a moving image signal that is rotated 270 degrees and is reduced and arranged in the left half of the display.

According to the first and second aspects of the invention, the flat-type display can be stereoscopically mounted by attaching it to a flat pad computer using a liquid crystal display such as an iPad with a foldable and lightweight attachment and passive polarized glasses. In addition, a lightweight and portable low-cost stereoscopic device can be provided.

1 is a perspective view of a stereoscopic device according to the present invention. It is a side view which shows each element in the stereoscopic vision apparatus by this invention, a display image, and its mirror image. It is a signal block diagram which shows signal processing flow representation in the stereoscopic device by this invention. FIG. 4 shows an image output from each block of the signal block diagram shown in FIG. 3. FIG. It is a perspective view showing one embodiment of this invention. It is a perspective view of other embodiment of this invention. It is a perspective view of further another embodiment of this invention. It is a top view which shows a prior art.

A perspective view of a stereoscopic device according to the present invention is shown in FIG. 1, and a side view thereof is shown in FIG.
The liquid crystal display unit 12 of the flat pad type computer 11 is divided into two, and a right-eye view image 13 is displayed on one side and a left-eye view image 14 is displayed on the other side. Further, a mirror image 16 of the right-eye view image 13 appears through a total reflection mirror 15 arranged to form 45 degrees with the surface of the display unit. In addition, a total reflection mirror 17 is arranged in parallel to the surface of the display unit 12 at a position 1/2 of the long side away from the surface of the display unit 12, and a mirror image 18 of the left-eye view image 14 appears to further display the display. The second mirror image 20 of the left-eye view image appears by reflecting the mirror image 16 of the left-eye view image 14 with the semi-reflecting mirror 19 arranged so as to form 135 degrees with the surface of the part 12. The image displayed on the liquid crystal display unit 12 has uniform polarization characteristics. However, if the liquid crystal display unit 12 is linearly polarized light having a polarization axis at 45 degrees clockwise with respect to the long side direction, the mirror image 16 is clockwise. The second mirror image 20 having a polarization axis at 135 degrees and reversing the mirror image twice will have a polarization axis at 45 degrees. The mirror image 16 and the second mirror image 20 form a composite mirror image that is superimposed at approximately the same distance from the observer 21, and the observer 21 has polarization characteristics that are orthogonal to each other with the polarization axis being 45 degrees clockwise and 135 degrees clockwise. A three-dimensional image is obtained by observing the composite mirror images 16 and 20 via the glasses 24 holding the polarizing plates 22 and 23. In addition, when the polarization axis of the liquid crystal display unit 12 is 0 ° or 90 ° clockwise with respect to the long side direction, the polarization axis is set to 45 clockwise by laying a film having optical activity on the liquid crystal display unit. It is known to rotate the polarization axis to a degree. Although the polarization characteristic of the liquid crystal display unit 12 has been described so far as linearly polarized light, a liquid crystal display unit having circularly polarized light as the polarization characteristic may be used. In this case, the polarizing plates 22 and 23 are right-turning and left-turning circularly polarizing plates, and the polarizing plates whose polarization characteristics are orthogonal are polarizing plates that turn left and right, respectively.

Next, FIG. 3 shows a block diagram of signal processing of the stereoscopic device according to the present invention.
In FIG. 3, the input stereoscopic video file 31 is a multiplexed left-eye view stream and right-eye view stream, and is stored in a storage device built in a flat pad computer and the Internet. May be held on a server on the Internet through. The stereoscopic video file 31 is divided into a left-eye view image stream and a right-eye view image stream by the demultiplexer 32 and is input to the scalers 33 and 34 and is reduced to about half the size. One stream is input to the left / right reversal block 35 and inverted, and the image is rotated in the clockwise direction 90 degrees by the rotating machine 36, and the other stream is rotated in the counterclockwise direction 90 degrees by the rotating machine 37. The gain adjustment blocks 38 and 39 for adjusting the luminance of each stream optimize the luminance of the left-eye visual image and the right-eye visual image, and then input to the liquid crystal display block 40 and combine them for presentation to the liquid crystal display body 12. The video signal is output. By the time the right-eye image is emitted from the liquid crystal display unit and reaches the observer, it is reflected once by the total reflection mirror and passes once through the semi-reflection mirror, whereas the left-eye image is emitted from the liquid crystal display unit. Since it passes through the semi-reflecting mirror once before reaching the observer, it is reflected once by the total reflecting mirror and reflected once by the semi-reflecting mirror, so that a difference in luminance occurs. For this reason, gain adjustment blocks 38 and 39 for optimizing the luminance of the left-eye view image and the right-eye view image are used. The brightness difference of the left-eye view image that receives a lot of attenuation is maximized in a range without saturation, and the brightness difference of the right-eye view image is attenuated to reduce the brightness difference. The liquid crystal display block 40 juxtaposes two input video signals on the left and right sides of the liquid crystal display unit 12.

An image appearing at the output of each block in the signal processing block diagram is shown in FIG. In FIG. 4, 32a is a demultiplexed left eye view image and right eye view image, 33a and 34a are output images of scalers 33 and 34, 35a is a horizontally inverted image, and 36a and 37a are 90 degrees and 135 respectively. 40a indicates an output image from the liquid crystal display block 40 in which two input video signals are juxtaposed on the left and right of the liquid crystal display unit 12.

In the above, the arrangement of the right-eye view image and the left-eye view image may be exchanged.

FIG. 5 shows an embodiment of a stereoscopic device for mounting on a flat pad computer according to the present invention.
A plastic frame 24 holds the total reflection mirror 15. A plastic frame 25 holds the total reflection mirror 17. A plastic frame 26 holds the semi-reflecting mirror 19. Each plastic frame 24, 25, 26 has a common rotating shaft 27 and is freely rotatable, but is metastable at the relative position between the mirrors shown in FIG. Reference numeral 28 denotes a groove configured to hold the flat pad type computer 11 in FIG.
FIG. 6 shows an embodiment in which the embodiment of FIG. 5 is folded into a flat shape to facilitate portability.
FIG. 7 shows an embodiment in which the plastic frame 25 is also folded and miniaturized in order to make the embodiment shown in FIG. 6 easier to carry.

According to the present invention, it is possible to view a stereoscopic image only by using a commercially available flat pad type computer as it is. In addition, the mirror image obtained by the total reflection mirror and the mirror image obtained by the total reflection mirror and the semi-reflection mirror appear at the same position when viewed from the observer, so the left eye view image and the right eye view image are equidistant, and You can watch without burdening.
Furthermore, it can be flattened by folding the two total reflection mirrors and the semi-reflection mirror, and can be carried around with a flat pad computer.
Furthermore, on the Internet, stereoscopic videos that multiplex left-eye view streams and right-eye view streams are already distributed, such as YouTube, and these streams can be viewed stereoscopically with simple software operations such as reduction, rotation, and reversal. Is possible.

DESCRIPTION OF SYMBOLS 11 Flat pad type computer, 12 Liquid crystal display part, 13 Right-eye image, 14 Left-eye image, 15 Total reflector, 16 Mirror image of right-eye image 13, 17 Total reflector, 18 Mirror image of left-eye image 14 , 19 Semi-reflecting mirror, 20 Second mirror image of left-eye view image, 21 Observer, 22 Polarizing plate, 23 Polarizing plate having polarization characteristics orthogonal to polarizing plate 22, 24 Plastic frame holding total reflection mirror 15, 25 is a plastic frame for holding the total reflection mirror 17, 26 is a plastic frame for holding the semi-reflection mirror 19, 27 is a plastic frame rotating shaft 27, and 28 is a groove for holding the flat pad type computer 11,
31 stereoscopic image file, 32 demultiplexer, 33 scaler, 34 scaler, 35 horizontal reversal block, 36 rotating machine, 37 rotating machine, 38 gain adjusting block, 39 gain adjusting block, 40 liquid crystal display block, 41 liquid crystal display body, 42 Right-eye image, 43 Liquid crystal display, 44 Left-eye image, 45 Half mirror, 46 Mirror image of right-eye image 42, 47 Polarizing plate, 48 Polarizing plate orthogonal to polarizing plate 47, 49 Polarizing plate Glasses to hold, 50 observers.

Claims (4)

Dividing the liquid crystal display in two, displaying the right-eye view image on one side and the left-eye view image on the other side. In addition, a mirror image of the right-eye view image is presented to the operator through a total reflection mirror arranged at 45 degrees with the surface of the display. Further, a total reflection mirror arranged in parallel with the display surface is arranged at a position 1/2 of the long side of the display surface from the display surface to display a left-eye view mirror image, and further the display The mirror image of the left-eye view is further reflected by a semi-reflecting mirror arranged to form 135 degrees with respect to the surface of the screen to display a second mirror image, which is presented to the operator via a pair of polarizing plates. A stereoscopic device. 2. The stereoscopic device according to claim 1, wherein the two total reflection mirrors and the one semi-reflection mirror are foldable, and the thickness when folded is 1/4 or less of the short side of the liquid crystal display. A stereoscopic device characterized by the above. A stereoscopic video file composed of a right-eye view image and a left-eye view image is input. The right-eye view image is rotated 90 degrees after being turned upside down and is reduced in the right half of the display. A stereoscopic device comprising an image signal conversion function that outputs a moving image signal reduced and arranged in the left half of the display. The stereoscopic device according to claim 1, wherein a difference is provided between the luminance of the right-eye image displayed on the liquid crystal display and the luminance of the left-eye image.