JP2009031523A - Stereoscopic image display device and stereoscopic image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stereoscopic image display device and method, restraining a crosstalk occurring when the frame rate is increased. <P>SOLUTION: On an image display surface of an image display part, a right eye image I<SB>R</SB>and a left eye image I<SB>L</SB>corresponding to a parallax for observing a stereoscopic image are switched and displayed at interval of two or more frames. A time sharing shutter having a right eye shutter and a left eye shutter is disposed between the image display screen and an observer. In the time sharing shutter, the display of the right eye image and the left eye image in the image display part and opening and closing of the right eye shutter and the left eye shutter in the time sharing shutter are controlled and synchronized so that in reproducing the right eye image, the right eye shutter is opened, and the left eye shutter is closed, and in reproducing the left eye image, the right eye shutter is closed, and the left eye shutter is opened. The image of the image display part is images at different times in consecutive frames regardless of discrimination between the left eye image and the right eye image. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stereoscopic video display device and a stereoscopic video display method, and more particularly to a stereoscopic video display device and a stereoscopic video display method using an electronic shutter.

  Conventionally, various attempts have been made for techniques for expressing stereoscopic images, and image display methods relating to stereoscopic images have been studied and put into practical use in many fields that handle images such as photographs, movies, and televisions. Yes.

  Three-dimensional image display methods are roughly classified into a glasses method and a no-glasses method. In either method, an image with parallax is separately incident on the left and right eyes of an observer, and a stereoscopic image is displayed. It can be seen as a video.

  As a glasses method, a method using polarized glasses disclosed in Patent Document 1 and a method using shutter glasses disclosed in Patent Document 2 are known.

  The polarized glasses-type stereoscopic image display device described above is attached to, for example, a liquid crystal panel unit and the front surface thereof, and a divided wavelength plate (1/2 wavelength plate) for changing the polarization direction is arranged every horizontal line of a pixel row. And a divided wavelength plate filter provided. For example, the image light from the liquid crystal panel is emitted as it is without changing the polarization direction in the even lines, and is converted into a direction orthogonal to the linearly polarized light from the even lines by the action of the divided wavelength plate filter in the odd lines. Are emitted. For example, it is assumed that the image light for the right eye is reproduced with even lines and the image light for the left eye is reproduced with odd lines.

For example, the image light emitted as described above is observed by an observer through so-called polarizing glasses in which polarizing plates having polarization angles orthogonal to each other are arranged for the right eye and the left eye. By using polarized glasses, the image light for the right eye reproduced in the even line is incident on the observer's right eye, and the image light for the left eye reproduced in the odd line is applied to the observer's left eye. Incident.
In this way, a stereoscopic image can be observed by observing the left and right images through the polarizing glasses.

In the shutter glasses type stereoscopic image display device, for example, in the image display unit, the right eye image signal and the left eye image signal are alternately supplied for each frame, and the left eye image and the left eye image are displayed on the display surface. The image for the right eye is reproduced alternately every frame.
The above-described image is observed by an observer through so-called shutter glasses in which shutters that are alternately opened and closed, such as liquid crystal, are arranged for the right eye and the left eye. By using the shutter glasses, the image for the right eye is observed with the right eye of the observer, the image for the left eye is observed with the left eye, and a stereoscopic image can be observed.
The shutter glasses made of liquid crystal are composed of, for example, a liquid crystal panel provided with a linear polarizing filter, and light is transmitted or not transmitted by driving the liquid crystal panel.

FIG. 7 is a drive timing chart of the above-described shutter glasses type stereoscopic image display device.
For example, in the image display unit, a moving image is displayed at a frame rate of 120 fps (period 8.3 ms). The display frame D shows the timing of the first frame F1, the second frame F2,.

Here, for example, odd frames (first frame F1, third frame F3,...) Are images for the left eye, and even frames (second frame F2, fourth frames F4,...) Are images for the right eye. When present, 100% transmission T _L is odd frame of the shutter for the left eye, 0% in the even frame, whereas the transmittance of the right-eye shutter T _R is 0% in the odd frame, and 100% even frame Thus, the transmittance is changed in accordance with the timing of the display frame. For example, when a liquid crystal shutter is used, if it takes about 2 ms to change the transmittance from 0% to 100% (or from 100% to 0%), it is placed before and after each frame. It is necessary to design the blanking period B to be set to about 2 ms so that the transmittance change is completed during the blanking period B.
As described above, the left-eye image is observed with the left eye of the observer in the odd-numbered frame, and the right-eye image is observed with the right eye in the even-numbered frame, so that a stereoscopic image can be observed.

For example, in general image display apparatuses, it is required to improve the image quality of displayed images. For this purpose, as described in Patent Document 3, it is necessary to increase the frame rate, which is a value indicating the number of times the screen is updated per second.
For example, a screen is displayed by scanning one-dimensional display light using a one-dimensional modulation light element called GLV (grating light valve). Since the GLV element has a high response speed, video display at a high frame rate is possible.

  Here, when the stereoscopic video is displayed by the time division method as described above, the following problems occur when the frame rate of the display device is increased.

FIG. 8 is a drive timing chart of the above-described shutter glasses type stereoscopic image display device, and the frame rate is higher than that in FIG.
For example, in the image display unit, a moving image is displayed at a frame rate of 240 fps (period 4.15 ms). The display frame indicates the timing of each of the first frame F1, the second frame F2,.

Here, for example, odd frames (first frame F1, third frame F3,...) Are images for the left eye, and even frames (second frame F2, fourth frames F4,...) Are images for the right eye. When present, 100% transmission T _L is odd frame of the shutter for the left eye, 0% in the even frame, whereas the transmittance of the right-eye shutter T _R 0 percent odd frame, and 100% even frame Thus, the transmittance is changed in accordance with the timing of the display frame.

  Here, as in the case of FIG. 7, for example, when a liquid crystal shutter is used, it takes about 2 ms per change to change the transmittance from 0% to 100% (or from 100% to 0%). Therefore, if the blanking period is similarly secured about 2 ms, about half of 4.15 ms in one cycle becomes the blanking period, and the amount of light in the blanking period is wasted, so that a display device having the same brightness can be obtained. Disadvantages that increase the size of the device and increase power consumption to achieve, scan time shortens scan-type display devices, and disadvantages that complicate the device to drive the display device faster, all-pixel type However, this display device has the disadvantage that the scanning time is shortened and the circuit for driving each pixel with voltage is complicated. For this reason, when it takes about 2 ms to change the transmittance, it is difficult to display 240 fps, and the display of 120 fps is the limit.

FIG. 8 shows a case where the blanking period B for one cycle is shortened compared to the case of FIG. 7 and the proportion of time for displaying an image is secured.
However, the time required for the change in transmittance of the liquid crystal shutter is about 2 ms as before. Therefore, in the case of FIG. 8, the period during which the change in transmittance occurs is the end of the previous frame and the start of the next frame. It has overlapped with the part of. During this overlapping period, so-called crosstalk occurs in which the right-eye image is observed with the left eye and the left-eye image is observed with the unintended eye with low transmittance. The overlap period is a crosstalk period _PCT .
JP 2004-157425 A JP 2002-82307 A JP 2005-136868 A JP 2006-91471 A

  The problem to be solved is that it is difficult to suppress the crosstalk that occurs when the frame rate is increased in a stereoscopic image display apparatus and method using left-eye and right-eye shutters. .

  The stereoscopic video display device according to the present invention includes an image display unit that switches between a right-eye image and a left-eye image corresponding to parallax for viewing a stereoscopic video for each of a plurality of frames and displays the image on the image display surface, and the image display A time-division shutter having a right-eye shutter and a left-eye shutter disposed between a surface and an observer, and the right-eye shutter is opened when the right-eye image is reproduced in the time-division shutter. Display of the image for the right eye and the image for the left eye in the image display unit so that the shutter for the eye is closed and the shutter for the right eye is closed and the shutter for the left eye is opened at the time of reproducing the image for the left eye And a control unit that synchronizes opening and closing of the right-eye shutter and the left-eye shutter in the time-division shutter, and the image display unit is configured to display the left-eye image and the right-eye image. Regardless, and displaying the images of different times in successive frames to the image display surface.

In the stereoscopic video display device of the present invention, the right-eye image and the left-eye image corresponding to the parallax for visually recognizing the stereoscopic video are displayed on the image display surface of the image display unit by switching every plural frames. In a time-division shutter having a right-eye shutter and a left-eye shutter placed between the image display surface and the observer, the right-eye shutter is opened and the left-eye shutter is closed when the right-eye image is played back. Display of right-eye image and left-eye image in the image display unit and right-eye shutter and left-eye shutter in the time-division shutter so that the right-eye shutter is closed and the left-eye shutter is opened during reproduction of the eye image The opening and closing of the shutter is controlled and synchronized.
Here, in the image display unit, images at different times in successive frames are displayed on the image display surface regardless of the left-eye image and the right-eye image.

  The stereoscopic video display method of the present invention includes a step of switching a right-eye image and a left-eye image corresponding to a parallax for visually recognizing a stereoscopic video for each of a plurality of frames and displaying the images on an image display surface of an image display unit. In the time-division shutter having a right-eye shutter and a left-eye shutter disposed between the image display surface and the observer, the display of the right-eye image and the left-eye image in the image display unit and the Control to synchronize the opening and closing of the right eye shutter and the left eye shutter in the time-division shutter, the right eye shutter is opened and the left eye shutter is closed during the reproduction of the right eye image, And driving the left-eye shutter to close and the left-eye shutter to open when the left-eye image is reproduced, and the right-eye image and the left-eye image are converted to the image. In the step of displaying the 示面, irrespective another of said right-eye image and the left eye image, and displaying the images of different times in successive frames to the image display surface.

In the stereoscopic video display method of the present invention, the right-eye image and the left-eye image corresponding to the parallax for visually recognizing the stereoscopic video are switched every plural frames and displayed on the image display surface of the image display unit. In a time-division shutter having a right-eye shutter and a left-eye shutter arranged between a display surface and an observer, the right-eye image and the left-eye image are displayed on the image display unit and the right-eye is displayed on the time-division shutter. Controls the opening and closing of the shutter and the shutter for the left eye to be synchronized so that the right eye shutter opens and the left eye shutter closes when the right eye image is played back, and the right eye shutter opens when the left eye image is played back Drive to close and open the shutter for the left eye.
Here, when the right-eye image and the left-eye image are displayed on the image display surface, images at different times in successive frames are displayed on the image display surface regardless of whether the left-eye image and the right-eye image are different. indicate.

  According to the stereoscopic image display device of the present invention, in the device that displays stereoscopic images using the shutters for the left eye and the right eye, the right eye image and the left eye image are time-divisionally divided into a plurality of frames. Since the images are alternately displayed on the image display surface, the number of switching between the right-eye image and the left-eye image is reduced to less than half, and crosstalk occurs at the time of switching, so crosstalk is suppressed even when the frame rate is increased. can do.

  According to the stereoscopic video display method of the present invention, in the method of displaying stereoscopic video using the left-eye and right-eye shutters, the right-eye image and the left-eye image are time-divisionally divided into a plurality of frames. Since the images are alternately displayed on the image display surface, the number of times of switching between the right-eye image and the left-eye image can be reduced to half or less, and crosstalk generated at the time of switching can be suppressed. As a result, it is possible to realize a stereoscopic image display device having a high frame rate and excellent moving image quality.

  Embodiments of a stereoscopic video display device and a stereoscopic video display method of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a schematic diagram showing the overall configuration of a shutter glasses type stereoscopic image display apparatus according to this embodiment.
For example, the image display unit 1, the time division shutter 2, and the control unit are included.
For example, the image display unit 1 time-divides a right-eye image and a left-eye image corresponding to parallax for visually recognizing a stereoscopic video, and alternately displays them on the image display surface.
The time-division shutter 2 is, for example, shutter glasses in the form of glasses, and is disposed between the image display surface of the image display unit 1 and the viewer A, and includes a right-eye shutter and a left-eye shutter.
The control unit is provided, for example, by being connected to the image display unit 1 and the time-division shutter 2 by a wireless method or a wired method. In the case of the wireless method, for example, the first control unit 3a connected to the image display unit 1 and the time It has the 2nd control part 3b built in the housing | casing of the division | segmentation shutter 2. As shown in FIG.
The first control unit 3a transmits a synchronization signal synchronized with the image signal displayed on the image display unit 1 by a method such as radio wave transmission, infrared transmission, and wireless LAN, and the second control unit 3b receives the synchronization signal. Thus, the time-division shutter 2 is controlled in synchronization with the synchronization signal.
The control unit including the first control unit 3a, the second control unit 3b, and the like displays, for example, the right-eye image and the left-eye image in the image display unit, and the right-eye shutter and the left-eye shutter in the time-division shutter. Controls opening and closing to synchronize, and in the time-sharing shutter, the right-eye shutter is opened and the left-eye shutter is closed when the right-eye image is played back, and the right-eye shutter is closed and the left-eye shutter is closed when the left-eye image is played back Make sure the shutter is open.

Here, in the stereoscopic video display device of the present embodiment, the image display unit is configured to display the right-eye image and the left-eye image alternately on the image display surface for each of a plurality of frames.
Regardless of whether the left-eye image or the right-eye image is used, images at different times in successive frames are displayed on the image display surface.

FIG. 2 is a drive timing chart of the shutter glasses type stereoscopic image display device according to the present embodiment.
For example, in the image display unit 1, a moving image is displayed at a frame rate of 240 fps (period 4.15 ms). The display frame D shows the timing of the first frame F1, the second frame F2,.

Further, the right-eye image and the left-eye image are alternately displayed on the image display surface for each of a plurality of frames. In this embodiment, for example, the right-eye image and the left-eye image are alternately displayed every two frames. Is done.
For example, the first frame F1 and the second frame F2, the fifth frame F5 and the sixth frame F6,... Are the left eye image _IL , and the third frame F3, the fourth frame F4, the seventh frame F7, and the 8 frame F8, ·· is a right-eye image _{I R.}
Here, the images displayed on the image display unit are images at different times in successive frames regardless of the left-eye image and the right-eye image. This is because two consecutive frames for the right eye, two consecutive frames for the left eye, and two frames before and after switching between the left and right eye images are images at different times. Is shown.

Here, the display of the right eye image and the left eye image in the image display unit 1 and the opening and closing of the right eye shutter and the left eye shutter in the time division shutter 2 are synchronized by the control unit, for example, 1 frame F1 and the second frame F2, the fifth frame F5 and the sixth frame F6, the frame of the left-eye image I _L is played, such as ..., open the left eye shutter is closed right-eye shutter, Meanwhile, the third frame F3 and the fourth frame F4, the seventh frame F7 and the eighth frame F8, frame the right eye image I _R, such as ... is reproduced, the shutter for the left eye open right eye shutter Closes.

As shown in FIG. 2, the transmittance T _R of the transmission T _L and the right eye shutter of the shutter for the left eye, it varies along the shutter operation.
For example, the first frame F1 and the second frame F2, the fifth frame F5 and the sixth frame F6, the frame for the left eye image _{I L} is reproduced, such as ... is 100% 0% Other frame next frame, while the transmittance _{T R} of the right-eye shutter, the third frame F3 and the fourth frame F4, the seventh frame F7 and the eighth frame F8, the right-eye image _{I R,} such as ... are reproduced Becomes 100%, 0% in other frames, and at the timing when the left and right images are switched, the transmittance of each shutter changes from 0% to 100%, or from 100% to 0%.

  As described above, the right-eye image and the left-eye image are alternately displayed on the image display surface, and the left-eye shutter is opened in the left-eye image frame by controlling the time-division shutter in synchronization. 3D images can be observed with the left eye of the person, and with the right eye in the frame of the right eye image, the right eye shutter is opened.

  For example, the right-eye shutter and the left-eye shutter are each composed of a liquid crystal shutter whose light transmittance is changed by driving the liquid crystal. When the liquid crystal shutter is used, it takes about 2 ms, for example, to change the transmittance from 0% to 100% or from 100% to 0%.

Here, in the present embodiment, the time required to change the transmittance of the right-eye shutter and the left-eye shutter is longer than the blanking period B provided between the frames.
If the length of the blanking period is set to the time required for the change in the transmittance of each shutter, the proportion of the blanking period becomes long. For example, at a frame rate of 240 fps, a period of 4.15 ms The blanking period is about half, and the amount of light in the blanking period is wasted, and the disadvantage is that the device becomes large and the power consumption increases to realize a display device with the same brightness, scan with a scan type display device The disadvantage is that the time is shortened and the device is complicated because the display device is driven at a higher speed, and the all-pixel display device has the disadvantage that the scan time is shortened and the circuit for driving each pixel is complicated. . For this reason, when it takes about 2 ms to change the transmittance, it is difficult to display 240 fps, and the display of 120 fps is the limit.

Further, as shown in FIG. 2, from the frame of the left-eye image I _L of the right eye image I _R-frame, or when switching to the contrary, the transmittance of each shutter from 0% to 100%, or changes from 100% to 0%, but the period in which the transmittance change is happening overlaps the part of the beginning of the part and the next frame of the end of the previous frame, the cross-talk period P _CT so-called cross-talk occurs.

In the present embodiment, in a device that displays a stereoscopic image using a left-eye shutter and a right-eye shutter, the right-eye image and the left-eye image are time-divided and alternately displayed on a plurality of frames. Therefore, the number of switching between the right-eye image and the left-eye image is reduced to less than half than when the conventional right-eye image and left-eye image are alternately displayed frame by frame, Since crosstalk occurs at the time of switching, crosstalk can be suppressed even if the frame rate is increased.
Regardless of whether the image for the left eye is different from the image for the right eye, by displaying images at different times in successive frames and increasing the frame rate, it is possible to obtain a stereoscopic image with excellent moving image quality.
Further, in the present embodiment, it is possible to display a stereoscopic video with only one image projection system without using two image projection systems.

The stereoscopic video display method according to the present embodiment can be performed as follows using the stereoscopic video display device according to the present embodiment.
For example, a right-eye image and a left-eye image corresponding to parallax for visually recognizing a stereoscopic image are alternately displayed on the image display surface of the image display unit every plural frames, and between the image display surface and the observer. In the time-division shutter having the right-eye shutter and the left-eye shutter arranged in the display of the right-eye image and the left-eye image in the image display unit and the right-eye shutter and the left-eye shutter in the time-division shutter When the right-eye image is played back, the right-eye shutter is opened and the left-eye shutter is closed, and when the left-eye image is played back, the right-eye shutter is closed and the left-eye shutter is closed. Drive to open.
Here, when the right-eye image and the left-eye image are displayed on the image display surface, images at different times in successive frames are displayed on the image display surface regardless of whether the left-eye image and the right-eye image are different. indicate.

For example, as the right-eye shutter and the left-eye shutter that constitute the time-division shutter, liquid crystal shutters whose light transmittance changes by driving the liquid crystal can be used.
In addition, for example, the time required to change the transmittance of the right-eye shutter and the left-eye shutter is longer than the blanking period provided between the frames, thereby reducing the image quality improvement effect due to the higher frame rate. Can be avoided.

  According to the stereoscopic video display method of the present embodiment, in the method of displaying stereoscopic video using the left-eye shutter and the right-eye shutter, the right-eye image and the left-eye image are alternately displayed for each of a plurality of frames. Since the display is performed on the display surface, the number of switching between the right-eye image and the left-eye image can be reduced to half or less, and crosstalk generated at the time of switching can be suppressed.

3A is a non-stereo image for four frames according to the present embodiment, FIG. 3B is a corresponding left-eye image for four frames, and FIG. 3C is a corresponding right eye for four frames. FIG. 3D shows an image for four frames of image data used in the stereoscopic video display apparatus of the present embodiment.
As shown in FIG. 3A, the non-stereo image has different times from the first frame F1 to the fourth frame F4, and the images have different times.
FIGS. 3B and 3C are a left-eye image and a right-eye image at times corresponding to FIG. 3A, respectively. The images are at different times from the first frame F1 to the fourth frame F4.
FIG. 3D shows image data used in the stereoscopic image display apparatus according to the present embodiment. The first and second frames (F1, F2) are the first and second frames (F1, F2) of the left-eye image. ), And the third and fourth frames (F3, F4) are data of the third and fourth frames (F3, F4) of the right-eye image. As described above, the image data displayed on the image display unit of the present embodiment has a configuration in which a plurality of frames of left-eye images and a plurality of frames of right-eye image data are alternately arranged.

  In the present embodiment, as images displayed on the image display unit as described above, images at different times are displayed in successive frames regardless of whether the image for the left eye and the image for the right eye are different.

A stereoscopic image can be displayed by displaying the image as described above in the image display unit and using the shutter for the left eye and the right eye.
Regardless of whether the image for the left eye or the image for the right eye is displayed, images at different times are displayed in successive frames, whereby a high-quality image can be obtained by increasing the frame rate.

The image data as described above, for example, image data for only the right eye image data and image data for only the left eye image data are created in advance, and image data for a plurality of frames from the right eye image data, Further, image data for a plurality of frames can be extracted from the left-eye image data, and alternately arranged and recorded to form one image data.
Further, image data sequentially acquired from a right-eye camera for acquiring right-eye image data and a left-eye camera for acquiring left-eye image data are sequentially and sequentially recorded in a plurality of frames. Thus, it is possible to create the image data directly at the time of imaging.
In the present embodiment, as described above, the image displayed on the image display unit is switched between the left-eye image and the right-eye image for each of a plurality of frames, and is related to the distinction between the left-eye image and the right-eye image. Instead, images are taken at different times in successive frames.

Second Embodiment FIG. 4 is a schematic diagram showing the overall configuration of a shutter glasses type stereoscopic image display apparatus according to this embodiment.
For example, the image display unit 1, the time division shutter 2, and the control unit are included.
For example, the image display unit 1 alternately displays a right-eye image and a left-eye image corresponding to parallax for visually recognizing a stereoscopic image on the image display surface by scanning with modulated light. For example, the image light projection system 15 and the screen 16 are provided, and the modulated light projected from the image light projection system 15 is scanned on the screen 16 to display an image. The modulated light is, for example, one-dimensional modulated light obtained by using a grating light valve element as will be described later.
The time-division shutter 2 and the control units (first control unit 3a and second control unit 3b) are the same as those in the first embodiment.
FIG. 5A is a schematic diagram illustrating a configuration of an image display unit of the stereoscopic video display apparatus according to the present embodiment.
The image display unit of the stereoscopic video display apparatus according to the present embodiment scans one-dimensional display light using a one-dimensional modulation light element called GLV as described in Patent Document 4, for example. This is an image display unit that displays a screen.
In the image display unit using the GLV element of the present embodiment, it is possible to display a video at a high frame rate of, for example, 240 fps or 480 fps or higher.

For example, it includes a light source 10, an illumination lens 11, a GLV element 12, a projection lens 13, an image light projection system 15 having a scanning mirror 14, and a screen 16.
Light from the light source 10 enters the GLV element 12 through the illumination lens 11.

In the GLV element 12, the light from the incident light source 10 is modulated in accordance with the image data input to the GLV element 12, and one-dimensional modulated light corresponding to the image data is obtained.
The operation principle of this GLV type optical diffraction modulation element will be described.
For example, a common electrode made of a polysilicon thin film or the like is formed on a substrate made of silicon or the like, and a strip-like movable ribbon and a non-moving ribbon are alternately arranged at a predetermined distance from the common electrode. Is formed. The movable ribbon is connected to a driving voltage power source, and the non-moving ribbon is set to a fixed potential. The upper surfaces of the movable ribbon and the immovable ribbon are made of a reflective member. The movable ribbon can move in a direction orthogonal to the reflection surface of the reflection film in accordance with the driving voltage, and the height of the reflection surface of the movable ribbon (for example, the distance to the substrate) can be changed. On the other hand, the stationary ribbon is fixed, and the height of the reflecting surface is unchanged.

As described above, when the moving amount of the movable ribbon is λ / 4 with respect to the wavelength λ of the incident light, the 0th-order diffracted light and the ± 1st-order diffracted light reflected in the direction opposite to the incident direction are reflected as diffracted light. Here, for example, only one diffracted light can be imaged on a screen through a spatial filter and used for image display. Here, since the + 1st order diffracted light is not generated during non-operation, this OFF state corresponds to the dark state of the screen, and the display screen becomes black. In addition, by controlling the amount of movement by adjusting the driving voltage to the movable ribbon in accordance with image information from the outside, it is possible to turn on / off the pixels and display the gradation between them.
As described above, by using one diffracted light of the reflected diffracted light, one-dimensionally modulated light can be obtained.

  The obtained one-dimensional modulated light is scanned in the scanning direction DR on the screen 16 by scanning with the scanning mirror 14 through the projection lens 13.

FIG. 5B is a schematic diagram for explaining image display by scanning the one-dimensional modulated light on the screen 16.
For example, the one-dimensional modulated light 17 extending in the y-axis direction is scanned on the screen 16 in the scanning direction DR (x-axis direction). The one-dimensional modulated light 17 is light that has already been modulated in accordance with image data in the y-axis direction, and is scanned in the x-axis direction while being modulated in accordance with the position on the x-axis. Can be reproduced on the screen 16.

  Although not shown in FIG. 5A, for example, three-dimensional light sources of blue (B), green (G), and red (R) are used to form one-dimensional modulated light of each color. It is also possible to display a color image by projecting it onto one lens and combining it, and scanning it on a screen with a scanning mirror.

In order to enable video display at a higher frame rate, the area on the screen is divided into a plurality of areas, and an image light projection system is provided for each area. It is also possible to form one image on the entire screen by scanning.
FIG. 6 is a schematic diagram for explaining image display by scanning one-dimensional modulated light when the screen is divided into two regions.
For example, it is divided into two regions arranged in the x-axis direction, and two image light projection systems from the light source to the scanning mirror are provided corresponding to each region.

In the two areas (16a, 16b) on the screen 16, the one-dimensional modulated light (17a, 17b) is projected, and each is scanned in the scanning direction DR (x-axis direction). The area 16a corresponds to this area. An image corresponding to this area is displayed in the area 16b. By combining the area 16a and the area 16b, one image can be displayed as a whole.
In addition, a configuration and method for realizing a high frame rate as described in Patent Document 3 can be adopted in this embodiment.

Except for the use of the image display unit described above, the stereoscopic video display device and the stereoscopic video display method according to this embodiment are the same as those in the first embodiment.
That is, in a device that displays a stereoscopic image using a left-eye shutter and a right-eye shutter, the right-eye image and the left-eye image are time-divided and displayed alternately on a plurality of frames on the image display surface. Therefore, the number of switching between the right-eye image and the left-eye image is reduced to less than half and crosstalk occurs at the time of the switching, so that crosstalk can be suppressed even if the frame rate is increased.

The present invention is not limited to the above description.
For example, the scanning direction is not particularly limited, and may be either the horizontal direction or the vertical direction.
In principle, not only an image display unit using a GLV element that scans one-dimensional modulated light to form an image, but also a liquid crystal display unit, a line sequential display unit such as an FED (Field Emission Display), a CRT ( Even in a point scanning type display unit such as a cathode ray tube, the one-dimensional display light obtained by scanning in one direction can be handled in the same manner as described above, so that it can be applied as the stereoscopic image display device of the present invention. it can.
Further, the time-division shutter may be a time-division shutter provided in a hole for a right eye and a left eye provided in a wall or an apparatus housing without using a state of glasses.
In addition, various modifications can be made without departing from the scope of the present invention.

  The 3D image display apparatus and 3D image display method of the present invention can be applied to a display apparatus and method capable of displaying an image in 3D.

FIG. 1 is a schematic diagram illustrating an overall configuration of a shutter glasses type stereoscopic image display apparatus according to the first embodiment. FIG. 2 is a driving timing chart of the shutter glasses type stereoscopic image display device according to the first embodiment. 3A shows a non-stereo image for four frames according to the present embodiment, FIG. 3B shows a corresponding left-eye image for four frames, and FIG. 3C shows a corresponding four-frame right eye. FIG. 3D shows an image for four frames of image data used in the stereoscopic video display apparatus of the present embodiment. FIG. 4 is a schematic diagram showing an overall configuration of a shutter glasses type stereoscopic video display device according to the second embodiment. FIG. 5A is a schematic diagram showing the configuration of the image display unit of the stereoscopic video display apparatus according to the second embodiment, and FIG. 5B shows the display of an image by scanning the one-dimensional modulated light on the screen. It is a schematic diagram to explain. FIG. 6 is a schematic diagram for explaining image display by scanning one-dimensional modulated light when the screen according to the second embodiment is divided into two regions. FIG. 7 is a driving timing chart of the shutter glasses type stereoscopic image display apparatus according to the first conventional example. FIG. 8 is a driving timing chart of the shutter glasses type stereoscopic image display apparatus according to the second conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image display part, 2 ... Time division shutter, 3a ... 1st control part, 3b ... 2nd control part, 10 ... Light source, 11 ... Illumination lens, 12 ... GLV element, 13 ... Projection lens, 14 ... Scanning mirror, DESCRIPTION OF SYMBOLS 15 ... Image light projection system, 16 ... Screen, 16a, 16b ... Area | region, 17, 17a, 17b ... One-dimensional modulated light, D ... Display frame, B ... Blanking period, _TL ... The transmittance | permeability of the shutter for left eyes, T R _... transmittance of the right-eye shutter, F1~F8 ... frame, P _{CT ...} cross-talk period, a ... observer

Claims (6)

An image display unit that switches a right-eye image and a left-eye image corresponding to a parallax for visually recognizing a stereoscopic image for each of a plurality of frames and displays the image on the image display surface;
A time-division shutter having a right-eye shutter and a left-eye shutter disposed between the image display surface and the observer;
In the time-division shutter, the right-eye shutter is opened and the left-eye shutter is closed when the right-eye image is played back, and the right-eye shutter is closed and the left-eye shutter is closed when the left-eye image is played back. A control unit that synchronizes the display of the right-eye image and the left-eye image in the image display unit and the opening and closing of the right-eye shutter and the left-eye shutter in the time-division shutter so that the shutter is opened. Have
The stereoscopic image display device, wherein the image display unit displays images at different times in successive frames on the image display surface regardless of whether the image for the left eye and the image for the right eye are different. The stereoscopic image display device according to claim 1, wherein the right-eye shutter and the left-eye shutter are liquid crystal shutters whose light transmittance changes by driving of liquid crystal. The stereoscopic image display apparatus according to claim 1, wherein a time required to change the transmittance of the right-eye shutter and the left-eye shutter is longer than a blanking period provided between the frames. A step of switching a right-eye image and a left-eye image corresponding to parallax for visually recognizing a stereoscopic image for each of a plurality of frames and displaying them on an image display surface of the image display unit;
In a time-division shutter having a right-eye shutter and a left-eye shutter disposed between the image display surface and an observer, the display of the right-eye image and the left-eye image on the image display unit and the time Controlling to synchronize the opening and closing of the right eye shutter and the left eye shutter in the divided shutter, the right eye shutter is opened and the left eye shutter is closed during the reproduction of the right eye image, Driving to close the right-eye shutter and open the left-eye shutter during reproduction of the left-eye image, and
In the step of displaying the image for the right eye and the image for the left eye on the image display surface, images at different times in successive frames regardless of whether the image for the left eye and the image for the right eye are used. A 3D image display method characterized by displaying on a display surface. The three-dimensional image display method according to claim 4, wherein a liquid crystal shutter whose light transmittance is changed by driving a liquid crystal is used as each of the right eye shutter and the left eye shutter. The stereoscopic image display method according to claim 4, wherein a time required to change the transmittance of the right-eye shutter and the left-eye shutter is longer than a blanking period provided between the frames.

Images