JP2010286635A - Stereoscopic image display device and stereoscopic image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve color reproduction, when displaying a stereoscopic image by dividing a wavelength band to be used for a right-eye image and a left-eye image. <P>SOLUTION: A stereoscopic image display device includes: a first image output part 10 having a main light source 11 generating white light; a sub light source 12 generating red monochrome light; a color separation part 13 separating the white light generated by the main light source 11 into three wavelength bands, a red band, a green band, and a blue band; and a projector 14 generating a first image by using green and blue band light out of the red, green and blue band light separated by the color separation part 13, as well as the red monochrome light generated by the sub light source 12; and a second image output part 20 having a main light source 21 generating white light, a color separation part 23 separating the white light generated by the main light source 21 into three wavelength bands, the red, green and blue bands, and a projector 24 generating a second image by using the red, green and blue bands separated by the color separation part 23. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stereoscopic video display device and a stereoscopic video display method. Specifically, the present invention relates to a stereoscopic video display device and a stereoscopic video display method for generating a left-eye image and a right-eye image.

  The wavelength division filter method projects the image for the left eye and the image for the right eye on the screen with two projectors (LCD (Liquid Crystal Display) method, DMD (Digital Micromirror Device) method, etc.), and wavelength separation of the projected light This is a method of obtaining a stereoscopic image by separating the left eye image and the right eye image with filter glasses.

  In the wavelength division filter system, it is desirable to match the left and right chromaticities as much as possible when separating the projection light at the time of receiving light with the wavelength filter. Normally, the red, green, and blue wavelength bands of DLP and LCD projectors are each divided into two and assigned to the left-eye wavelength and the right-eye wavelength (see Patent Document 1).

  Further, there is a method in which blue and green are divided into three components to adjust the chromaticity region, and a short wave region + long wave region and an intermediate color thereof are used.

JP 2004-333561 A

  However, in the method of dividing the three wavelength bands of red, green, and blue into two and assigning them to the left-eye wavelength and the right-eye wavelength, the difference in chromaticity range for the left and right eyes due to the wavelength difference of each color Color reproduction is an issue. Also, in the method of dividing blue and green into three components, the red color gamut is greatly different on the left and right, causing problems in color reproducibility.

  An object of the present invention is to improve color reproduction when a three-wavelength band is divided and assigned for left and right to display a stereoscopic image.

  The present invention relates to a main light source that generates white light, a sub-light source that generates red monochromatic light, and a color separation unit that separates white light generated by the main light source into three wavelength bands of a red band, a green band, and a blue band. A first image using a red band, a green band, and a blue band of the red band, the green band, and the blue band separated by the color separation unit, and the red monochromatic light generated by the sub-light source. A first video display unit having a generation unit, a main light source that generates white light, and a color separation unit that separates white light generated by the main light source into three wavelength bands of a red band, a green band, and a blue band; And a second video output unit including a video generation unit that generates a second video using light in the red band, the green band, and the blue band separated by the color separation unit.

  In the present invention as described above, when the stereoscopic video is composed of the first video output from the first video output unit and the second video output from the second video output unit, The output unit generates red video using red monochromatic light generated from the sub-light source. This makes it possible to use red of a specific wavelength instead of red band light separated from white light for red, and the red color gamut can be made closer to the first video and the second video.

  The present invention also provides a main light source that generates white light, a sub-light source that generates red monochromatic light, and a color that separates white light generated by the main light source into three wavelength bands, a red band, a green band, and a blue band. The first image is generated using the separation unit and the red band, green band, and blue band light separated by the color separation unit, the green band light, the blue band light, and the red monochromatic light generated by the sub-light source. A first video display unit having a video generation unit, a main light source that generates white light, a sub-light source that generates red monochromatic light, and white light generated by the main light source in a red band, a green band, and a blue band. The color separation part that separates into the three wavelength bands, and the red, green, and blue band light separated by the color separation part, the green band light, the blue band light, and the red monochromatic light generated by the sub-light source A second video having a video generation unit for generating a second video using A stereoscopic image display apparatus and a radical 113.

  In the present invention as described above, when the stereoscopic video is composed of the first video output from the first video output unit and the second video output from the second video output unit, The output unit and the second video output unit generate a red video using the red monochromatic light generated from the sub-light source. This makes it possible to use red of a specific wavelength instead of red band light separated from white light for red, and the red color gamut can be made closer to the first video and the second video.

  Further, the present invention separates the white light generated by the main light source into three wavelength bands of the red band, the green band, and the blue band, and the green band light among the separated red band, green band, and blue band light, The first image is generated using the blue band light and the red monochromatic light generated by the sub-light source, and the white light generated by the main light source is separated into three wavelength bands of the red band, the green band, and the blue band. And a step of generating a second image using the separated red band, green band, and blue band light.

  In the present invention, when the first image and the second image form a stereoscopic image, the first image output generates a red image using red monochromatic light generated from the sub-light source. ing. This makes it possible to use red of a specific wavelength instead of red band light separated from white light for red, and the red color gamut can be made closer to the first video and the second video.

  Further, the present invention separates the white light generated by the main light source into three wavelength bands of the red band, the green band, and the blue band, and the green band light among the separated red band, green band, and blue band light, The first image is generated using the blue band light and the red monochromatic light generated by the sub-light source, and the white light generated by the main light source is separated into three wavelength bands of the red band, the green band, and the blue band. And a step of generating a second image using the separated red band, green band, and blue band light using the green band light, the blue band light, and the red monochromatic light generated by the sub-light source. This is a video display method.

  In the present invention, when a stereoscopic video is composed of the first video and the second video, red monochromatic light generated from the sub-light source is used for the output of the first video and the output of the second video. To generate a red video. This makes it possible to use red of a specific wavelength instead of red band light separated from white light for red, and the red color gamut can be made closer to the first video and the second video.

  Here, a semiconductor laser light source is used as the auxiliary light source. As a result, the red color gamut can be made closer to each other between the first video and the second video. One of the first video and the second video is for the right eye and the other is for the left eye. A three-dimensional image can be recognized by referring to images of different wavelengths on the left and right sides of the first image and the second image for each of the red band, the green band, and the blue band.

  According to the present invention, it is possible to improve the color reproducibility when dividing the three wavelength bands and assigning them to the left and right sides and displaying a stereoscopic image.

It is a block diagram explaining the example of a structure of the three-dimensional video display apparatus concerning this embodiment. It is a schematic diagram explaining the structural example of an optical system. It is a figure explaining in wavelength division of the right and left eyes by a wavelength division filter system. It is a figure which shows the spectrum of the visible region vicinity of a xenon lamp. It is a figure explaining the spectrum of the light which the right and left eyes receive after wavelength division at the time of using a xenon lamp as a main light source. It is a figure explaining the difference of the chromaticity of the image | video referred with the right and left eyes by a 3 division system. It is a figure which shows the example of the emission spectrum of the semiconductor laser used as a sublight source in the three-dimensional video display apparatus concerning this embodiment. It is a figure explaining the spectrum of the light which the right and left eyes receive at the time of using a sublight source. It is a chromaticity diagram explaining improvement of chromaticity by this embodiment. It is a figure which shows the emission spectrum of a UHP lamp. It is a block diagram explaining the structural example of the stereoscopic video display apparatus which concerns on other embodiment. It is a figure explaining the spectrum of the light which the right and left eyes receive at the time of using a sublight source. It is a figure explaining the structural example of the stereoscopic video display system to which the stereoscopic video display apparatus which concerns on this embodiment is applied.

Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described. The description will be given in the following order.
1. Configuration of stereoscopic video display device (example of block configuration, example of stereoscopic video display method, configuration example of optical system)
2. Wavelength-division filter method (example of 2-division method, example of 3-division method, spectrum of xenon lamp, example of spectrum of light received by left and right eyes, difference in chromaticity of left and right)
3. Display spectrum of stereoscopic image display device according to this embodiment (example of spectrum of semiconductor laser, example of spectrum when sub-light source is used, improvement of chromaticity)
4). 3D image display device according to another embodiment (UHP lamp spectrum, block configuration example, 3D image display method example, spectrum received by left and right eyes)
5). System configuration example

<1. Configuration of stereoscopic image display device>
[Block configuration]
FIG. 1 is a block diagram illustrating a configuration example of a stereoscopic video display apparatus according to the present embodiment. The stereoscopic video display device 1 according to the present embodiment mainly includes a first video output unit 10 and a second video output unit 20.

  The first video output unit 10 displays, for example, a left-eye video on the projection screen S, and the second video output unit 10 displays, for example, a right-eye video on the projection screen S. The video viewer refers to the right-eye video and the left-eye video displayed on the projection screen through wavelength separation filter glasses that transmit images of different wavelengths on the left and right sides, thereby providing a stereoscopic video. Can be seen. Here, the left-eye / right-eye separation is for convenience, and the left and right may be reversed.

  The first video output unit 10 includes a main light source 11 that generates white light, a sub-light source 12 that generates red monochromatic light, and white light generated by the main light source 11 in three red, green, and blue bands. And a color separation unit 13 for separating the wavelength band. In addition, the first video output unit 10 includes the green band light, the blue band light, and the red monochromatic light generated by the sub-light source 12 among the red band, green band, and blue band lights separated by the color separation unit 13. The projector 14 is provided as a video generation unit that generates the first video using the.

  In addition, the projector 14 includes a color separation unit 13. In addition, the projector 14 includes a spatial modulator 15 that modulates an optical signal in accordance with an electrical signal of a video, and a cross prism that synthesizes modulated light of each color. A wavelength synthesizer 16 is provided. It is also assumed that a UV (ultraviolet) / IR (infrared) light blocking, uniform illumination system and polarization control mechanism are incorporated as required.

  The second video output unit 20 includes a main light source 21 that generates white light, and a color separation unit 23 that separates the white light generated by the main light source 21 into three wavelength bands of a red band, a green band, and a blue band. Have. The second video output unit 20 includes a projector 24 as a video generation unit that generates a second video using light in the red band, the green band, and the blue band separated by the color separation unit 23.

  The projector 24 includes a color separation unit 23. In addition, the projector 24 includes a spatial modulator 25 that modulates an optical signal in accordance with an electric signal of an image, and a cross prism that synthesizes modulated light of each color. A wavelength synthesizer 26 is provided. It is also assumed that a UV (ultraviolet) / IR (infrared) light blocking, uniform illumination system and polarization control mechanism are incorporated as required.

[3D image display method]
In order to display a stereoscopic image using the stereoscopic image display apparatus according to the present embodiment, white light is generated from the main light source 11 of the first image output unit 10 and red monochromatic light is generated from the sub light source 12. Then, the white light generated by the main light source 11 is separated into three wavelength bands of a red band, a green band, and a blue band by the color separation unit 13. Thereafter, the first image is generated using the green band light and the blue band light among the separated red band, green band, and blue band light, and the red monochromatic light generated by the sub-light source 12, and a projection screen is generated. Projected on S.

  On the other hand, white light is generated from the main light source 21 of the second video output unit 20. Then, the white light generated by the main light source 21 is separated into three wavelength bands of the red band, the green band, and the blue band by the color separation unit 23. Thereafter, a second image is generated using the separated red band, green band, and blue band light, and is displayed on the projection screen S.

  On the projection screen S, the first video output from the first video output unit 10 and the second video output from the second video output unit 20 are displayed so as to overlap each other. These images are recognized as stereoscopic images by referring to them through predetermined glasses.

  Here, the first image output from the first image output unit 10 on the projection screen S and the second image displayed on the projection screen S from the second image output unit 20 are referred to as a stereoscopic image. The following glasses are used for recognition. That is, the glasses are provided with a left-eye filter for referring to the first image projected for the left eye and a right-eye filter for referring to the second image projected for the right eye. By referring to the first and second images with the left and right eyes through each filter, it is recognized as a stereoscopic image.

  The left-eye filter includes light in the first band (blue 1) in the blue band obtained by separating the white light generated by the main light source 11 by the color separation unit 13, and light in the first band (green 1) in the green band. ) And red monochromatic light (red 1) generated by the sub-light source 12 is transmitted.

  The right-eye filter includes a second band light (blue 2) in the blue band obtained by separating the white light generated by the main light source 21 by the color separation unit 23, and a second band light (in the green band ( It has a characteristic of transmitting green 2) and light in the second band (red 2) of the red band.

  Using this spectacle, the viewer refers to the images of the wavelengths of blue 1, green 1, and red 1 that have passed through the left eye filter with the left eye, and blue 2, green 2, and red 2 that have passed through the right eye filter with the right eye. Refer to the image of the wavelength. As a result, a stereoscopic image is recognized.

  Here, for the red color in the first image for the left eye, red monochromatic light (red 1) generated by the sub-light source 12 is used. Thereby, the red wavelength (red 2) for the right eye and the red wavelength can be made closer to each other, and the red color gamut when the video is referred to by the left and right eyes can be made closer. That is, the color gamut after separation can be made substantially the same on the left and right without changing the configuration of the glasses equipped with the wavelength separation filter (wavelength filter).

  Although not shown in FIG. 1, it is desirable that a spectral filter is provided between the projectors 14 and 24 and the projection screen S. The spectral filter has the same characteristics as the wavelength filter of glasses. That is, the spectral filter provided on the image exit surface side of the left-eye projector 14 has the same characteristics as the left-eye filter that transmit the wavelengths of blue 1, green 1, and red 1. In addition, the spectral filter provided on the image exit surface side of the right-eye projector 24 has the same characteristic of transmitting the wavelengths of blue 2, green 2, and red 2 as the right-eye filter. With this spectral filter, the spectral characteristics of the wavelength filter of the glasses can be more effectively exhibited.

[Configuration example of optical system]
2A and 2B are schematic diagrams for explaining a configuration example of the optical system, in which FIG. 2A shows the optical system of the first video output unit, and FIG. 2B shows the optical system of the second video output unit.

  In the optical system of the first video output unit shown in FIG. 2A, a xenon lamp LP is used as the main light source 11, and red light is separated by the subsequent red separation dichroic mirror DM1. Here, the separated red light is discarded. Instead, a red semiconductor laser LS, which is the auxiliary light source 12, is provided, and red monochromatic light is sent to the subsequent stage.

  Blue light and green light transmitted without being separated by the red separating dichroic mirror DM1 are separated by the blue / green separating dichroic mirror DM2. Here, the green color is separated and sent to the subsequent stage via a mirror. On the other hand, the blue color is transmitted through the blue / green separating dichroic mirror DM2 and sent to the subsequent stage.

  In this first video output unit, a red separation dichroic mirror DM1, a blue / green separation dichroic mirror DM2, and a mirror M1 are provided as the color separation unit 13, and a red semiconductor which is the sub-light source 12 instead of the discarded red Red monochromatic light (red laser light) output from the laser LS is used.

  In the optical system of the second video output unit shown in FIG. 2B, the xenon lamp LP is used as the main light source 21, and the red light is separated by the subsequent red separation dichroic mirror DM1. The separated red light is reflected by the mirror M2 and sent to the subsequent stage.

  Blue light and green light transmitted without being separated by the red separating dichroic mirror DM1 are separated by the blue / green separating dichroic mirror DM2. Here, the green color is separated and sent to the subsequent stage via the mirror M1. On the other hand, the blue color is transmitted through the blue / green separating dichroic mirror DM2 and sent to the subsequent stage.

  The second video output unit includes a red separation dichroic mirror DM1, a blue / green separation dichroic mirror DM2, a mirror M1, and a mirror M2 as the color separation unit 23. The white light of the xenon lamp LP is configured in these configurations. It is separated into red, green and blue and sent to the subsequent stage.

<2. Wavelength division filter method>
FIGS. 3A and 3B are diagrams for explaining the wavelength division of the left and right eyes by the wavelength division filter method. FIG. 3A shows a two-division method and FIG. 3B shows a three-division method. Any of the division methods corresponds to the characteristics of the wavelength filter using glasses.

[2-split method]
As shown in FIG. 3A, in the two-division method, the blue band is divided into blue 1 in the long wavelength region and blue 2 in the short wavelength region. Further, the green band is divided into green 2 in the long wavelength range and green 1 in the short wavelength range. The red band is divided into red 1 in the long wavelength range and red 2 in the short wavelength range. Among these, blue 1, green 1 and red 1 indicated by broken lines in the figure are images for the left eye, and blue 2, green 2 and red 2 indicated by solid lines in the figure are images for the right eye.

[Three division method]
In the three-division method shown in FIG. 3B, the blue band is divided into blue 2a in the long wavelength region, blue 2b in the short wavelength region, and blue 1 in the medium wavelength region. Further, the green band is divided into a long wavelength range green 2a, a short wavelength range green 2b, and a medium wavelength range green 1. The red band is divided into red 1 in the long wavelength range and red 2 in the short wavelength range. Among these, blue 1, green 1, and red 1 indicated by broken lines in the figure are images for the left eye, and blue 2a, blue 2b, green 2a, green 2b, and red 2 indicated by solid lines in the figure are images for the right eye.

  Regardless of the division method, the light in the wavelength band of each color is separated by the left and right wavelength filters of the glasses and is referred to by the left and right eyes. Even in the case of the method, it is divided into two, red 1 in the long wavelength region and red 2 in the short wavelength region, similar to the two-division method.

[Xenon lamp spectrum]
Next, a spectrum when a xenon lamp that generates white light as a main light source is used will be described. FIG. 4 is a diagram showing a spectrum in the vicinity of the visible range of the xenon lamp. A xenon lamp can generate light having a wide wavelength range from 200 nm to 2000 nm.

[Spectrum of light received by left and right eyes]
FIG. 5 is a diagram for explaining the spectrum of light received by the left and right eyes after wavelength division when a xenon lamp is used as the main light source, where (a) shows the spectrum received by the left eye and (b) shows the spectrum received by the right eye. Show. Here, a general spectrum is obtained when the three-division method shown in FIG.

  In the left and right images, the broadband light (white light) generated from the xenon lamp is separated into light in the blue, green, and red bands by the color separation unit, and the images for each light in the blue, green, and red bands As modulated.

  Among the images for each light in the blue, green, and red bands, the left eye refers to the light in the blue 1, green 1, and red 1 bands as shown in FIG. 5A through the left-eye filter. On the other hand, the right eye refers to light in the blue 2a, red 2b, green 2a, green 2a, and red 2 bands as shown in FIG. 5B through the right eye filter.

[Difference between left and right chromaticity]
FIG. 6 is a diagram for explaining a difference in chromaticity of an image referenced by the left and right eyes according to the three-division method. In FIG. 6, the chromaticity is indicated by an XY color space, and the chromaticity of the original image, the chromaticity received by the left eye, and the chromaticity received by the right eye are respectively superimposed. The difference in chromaticity of the video referred to by the left and right eyes is remarkable in the red region. This is because the red region can only be divided into two regions by a normal wavelength filter. That is, the red band is divided into components having peaks in the short wavelength region (wavelength 635 nm) and the long wavelength region (wavelength 675 nm).

  At these wavelengths, the properties (color / brightness) of light that can be expressed differ greatly. For example, in the region of a wavelength of 635 nm or less, red begins to gradually have an orange component, and the wavelength of 675 nm can express deep red, but the visibility is less than half of 635 nm. Therefore, when the difference in chromaticity perceived by humans, especially when the entire surface is expressed in red, a very large difference occurs in the colors received by the left and right eyes.

<3. Display Spectrum of Stereoscopic Image Display Device According to this Embodiment>
[Spectrum of semiconductor laser]
FIG. 7 is a diagram illustrating an example of an emission spectrum of a semiconductor laser used as a sub-light source in the stereoscopic video display apparatus according to the present embodiment. In the present embodiment, red monochromatic light is generated from the sub-light source. This is to adjust the chromaticity of the red region on the left and right, and the following characteristics are required.

(1) ... having a wavelength that is transmitted through the long wavelength filter in the red region and reflected at the short wavelength filter.
(2)... In order to match the color gamut with the red light on the short wavelength side at the wavelength of (1), the wavelength can be brought close to the cutoff of the long wavelength side filter without having a long wavelength component.

  As one that satisfies the above characteristics, for example, in the form assuming that the red long wave component (red 1) for the left eye of the three-division method shown in FIG. 5 is replaced, it is excellent in monochromaticity having an emission peak at 625 nm to 645 nm. Desirable light source. As a result, a red semiconductor laser light source having an emission spectrum as shown in FIG. However, the auxiliary light source is not limited to the semiconductor laser, and any light source satisfying the above (1) and (2) can be applied.

  In the present embodiment, a red semiconductor laser having a peak oscillation wavelength at 634.3 nm as shown in FIG. 7 is used as the auxiliary light source.

[Spectrum with sub-light source]
FIG. 8 is a diagram for explaining the spectrum of light received by the left and right eyes when the sub-light source is used, where (a) shows the spectrum received by the left eye and (b) shows the spectrum received by the right eye. Here, the spectrum is obtained when the three-division method shown in FIG.

  Here, the main light source separates broadband light (white light) generated from a xenon lamp into light of a blue band, a green band, and a red band by a color separation unit. In the left eye shown in FIG. 8 (a), the red band light among the blue band, green band, and red band light separated by the color separation unit is discarded, and instead from the red semiconductor laser light source which is the sub-light source. The emitted red monochromatic light is used. When the red semiconductor laser light source having the spectrum shown in FIG. 7 is used, a red image is an image having a peak oscillation wavelength at 634.3 nm.

  For this reason, the left eye refers to light of blue 1, green 1, and red monochromatic light as shown in FIG. 8A through the left eye filter.

  On the other hand, in the right eye shown in FIG. 8B, broadband light (white light) generated from a xenon lamp is separated into blue band, green band, and red band light by a color separation unit, and each of blue, green, and red light is separated. It is modulated as an image for each band of light. For this reason, the right eye refers to the light in the blue 2a, red 2b, green 2a, green 2a, and red 2 bands as shown in FIG. 8B through the right eye filter.

  As in this embodiment, the red peak wavelength can be arbitrarily set by the design of the semiconductor laser by using the red monochromatic light from the red semiconductor laser as the red image for the left eye. For this reason, by using the light source having the characteristics shown in (1) and (2) above as the red image for the left eye, the wavelengths for the left eye and the right eye can be made closer to each other for the red image. The difference in chromaticity can be reduced.

[Improvement of chromaticity]
FIG. 9 is a chromaticity diagram for explaining the improvement of chromaticity according to the present embodiment. (A) is an example in which xenon lamps are used on both the left and right sides, and (b) is a sub-light source for the left eye as in the present embodiment. It is an example. In both figures, the left and right chromaticities in the XY color space are shown superimposed.

  As shown in FIG. 9A, it can be seen that when a xenon lamp is used on both the left and right sides, the difference in chromaticity between the left and right is particularly large in the red region. On the other hand, as shown in FIG. 9B, in the example using the auxiliary light source of the present embodiment, the difference between the left and right chromaticities in the red region is suppressed while the blue region and the green region are left as they are. I understand. Thereby, the color gamut of the left eye can be made substantially the same as that of the right eye without changing the glasses.

<4. Stereoscopic Video Display Device According to Other Embodiment>
Next, another embodiment of the stereoscopic video display device will be described.

[Emission spectrum of ultra high pressure mercury lamp]
In a stereoscopic image display apparatus according to another embodiment, a UHP (ultra high pressure mercury) lamp is used as a main light source. FIG. 10 is a diagram showing an emission spectrum of the UHP lamp. As shown in this figure, in the UHP lamp, the amount of light in the red region is smaller than the amount of light of other colors. For this reason, when the UHP lamp is used, the color reproduction in the red color gamut is inferior to the other color gamuts.

[Block configuration]
Therefore, in the stereoscopic video display device according to another embodiment, when using the UHP lamp, there is a feature in that the difference in chromaticity between right and left is suppressed while improving the color reproduction in the red region. FIG. 11 is a block diagram illustrating a configuration example of a stereoscopic video display apparatus according to another embodiment. In this configuration, two red semiconductor lasers having different wavelengths are used as auxiliary light sources for the left eye and the right eye.

  The stereoscopic video display device 1 according to another embodiment mainly includes a first video output unit 10 and a second video output unit 20.

  The first video output unit 10 displays, for example, a left-eye video on the projection screen S, and the second video output unit 10 displays, for example, a right-eye video on the projection screen S. The video viewer refers to the right-eye video and the left-eye video displayed on the projection screen through wavelength separation filter glasses that transmit images of different wavelengths on the left and right sides, thereby providing a stereoscopic video. Can be seen. Here, the left-eye / right-eye separation is for convenience, and the left and right may be reversed.

  The first video output unit 10 includes a main light source 11 that generates white light, a sub-light source 12 that generates red monochromatic light, and white light generated by the main light source 11 in three red, green, and blue bands. And a color separation unit 13 for separating the wavelength band. In addition, the first video output unit 10 includes the green band light, the blue band light, and the red monochromatic light generated by the sub-light source 12 among the red band, green band, and blue band lights separated by the color separation unit 13. The projector 14 is provided as a video generation unit that generates the first video using the.

  In addition, the projector 14 includes a color separation unit 13. In addition, the projector 14 includes a spatial modulator 15 that modulates an optical signal in accordance with an electrical signal of a video, and a cross prism that synthesizes modulated light of each color. A wavelength synthesizer 16 is provided. It is also assumed that a UV (ultraviolet) / IR (infrared) light blocking, uniform illumination system and polarization control mechanism are incorporated as required.

  The second video output unit 20 includes a main light source 21 that generates white light, a sub-light source 22 that generates red monochromatic light, and white light generated by the main light source 21 in three red, green, and blue bands. And a color separation unit 23 for separating the wavelength band. In addition, the second video output unit 20 includes green band light, blue band light, and red monochromatic light generated by the sub-light source 22 among red band, green band, and blue band light separated by the color separation unit 23. A projector 24 is provided as a video generation unit that generates a second video using the.

  The projector 24 includes a color separation unit 23. In addition, the projector 24 includes a spatial modulator 25 that modulates an optical signal in accordance with an electric signal of an image, and a cross prism that synthesizes modulated light of each color. A wavelength synthesizer 26 is provided. It is also assumed that a UV (ultraviolet) / IR (infrared) light blocking, uniform illumination system and polarization control mechanism are incorporated as required.

[3D image display method]
In order to display a stereoscopic image using the stereoscopic image display apparatus according to the present embodiment, white light is generated from the main light source 11 of the first image output unit 10 and red monochromatic light is generated from the sub light source 12. Then, the white light generated by the main light source 11 is separated into three wavelength bands of a red band, a green band, and a blue band by the color separation unit 13. Thereafter, the first image is generated using the green band light and the blue band light among the separated red band, green band, and blue band light, and the red monochromatic light generated by the sub-light source 12, and a projection screen is generated. Projected on S.

  On the other hand, white light is generated from the main light source 21 of the second video output unit 20 and red monochromatic light is generated from the sub-light source 22. Then, the white light generated by the main light source 21 is separated into three wavelength bands of the red band, the green band, and the blue band by the color separation unit 23. Thereafter, a second image is generated by using the green band light and the blue band light among the separated red band, green band, and blue band light and the red monochromatic light generated by the sub-light source 22, and a projection screen. Projected on S.

  On the projection screen S, the first video output from the first video output unit 10 and the second video output from the second video output unit 20 are displayed so as to overlap each other. These images are recognized as stereoscopic images by referring to them through predetermined glasses.

  Here, the first image output from the first image output unit 10 on the projection screen S and the second image displayed on the projection screen S from the second image output unit 20 are referred to as a stereoscopic image. The following glasses are used for recognition. That is, the glasses are provided with a left-eye filter for referring to the first image projected for the left eye and a right-eye filter for referring to the second image projected for the right eye. By referring to the first and second images with the left and right eyes through each filter, it is recognized as a stereoscopic image.

  The left-eye filter includes light in the first band (blue 1) in the blue band obtained by separating the white light generated by the main light source 11 by the color separation unit 13, and light in the first band (green 1) in the green band. ) And red monochromatic light (red 1) generated by the sub-light source 12 is transmitted.

  The right-eye filter includes a second band light (blue 2) in the blue band obtained by separating the white light generated by the main light source 21 by the color separation unit 23, and a second band light (in the green band ( It has a characteristic of transmitting green 2) and light in the second band (red 2) of the red band.

  Using this spectacle, the viewer refers to the images of the wavelengths of blue 1, green 1, and red 1 that have passed through the left eye filter with the left eye, and blue 2, green 2, and red 2 that have passed through the right eye filter with the right eye. Refer to the image of the wavelength. As a result, a stereoscopic image is recognized.

  Here, in the stereoscopic image display device according to another embodiment, red monochromatic light (red 1, red 2) generated by the sub-light sources 12 and 22 is used for red for both the left and right images. Note that the red monochromatic light for the left eye (red 1) and the red monochromatic light for the right eye (red 2) have wavelengths that are different enough to be separated by the left and right filters of the glasses, but are very close to each other. .

  For example, the red monochromatic light (red 1) of the sub light source 12 is set to 645 nm, and the red monochromatic light (red 2) of the sub light source 22 is set to 635 nm. At this time, the red light from the UHP lamp is removed to widen the color gamut.

  Thereby, the red color gamut when referring to the image with the left and right eyes can be made closer. That is, the color gamut after separation can be made substantially the same on the left and right without changing the configuration of the glasses equipped with the wavelength separation filter (wavelength filter).

  The optical system in the first video output unit 10 and the second video output unit 20 is the same as the optical system shown in FIG. However, a UHP lamp is used as the main light source 11. This optical system uses light in the blue band and light in the green band among the light generated by the UHP lamp, and discards light in the light red band. As an alternative to this, red monochromatic light emitted from the red semiconductor laser (red 1 (for example, wavelength 645 nm) in the first image output unit 10 and red 2 (for example, wavelength 635 nm) in the second image output unit 20)). use.

[Spectrum of light received by left and right eyes]
FIG. 12 is a diagram for explaining the spectrum of light received by the left and right eyes when the sub-light source is used, where (a) shows the spectrum received by the left eye and (b) shows the spectrum received by the right eye. Here, the spectrum is obtained when the three-division method shown in FIG.

  Here, the main light source separates light (white light) generated from the UHP lamp into light of a blue band, a green band, and a red band by a color separation unit. In the left eye shown in FIG. 12 (a) and the right eye shown in FIG. 12 (b), light in the red band is discarded from the light in the blue band, green band, and red band separated by the color separation unit. Red monochromatic light emitted from a red semiconductor laser light source, which is a sub-light source, is used.

  As the red monochromatic light emitted from the red semiconductor laser light source, which is a sub-light source, light having a peak oscillation wavelength at a wavelength of 645 nm for the left eye and at a wavelength of 635 nm for the right eye, for example, is used.

  As a result, the left eye refers to light of blue 1, green 1, and red monochromatic light as shown in FIG. 12A via the left eye filter. On the other hand, the right eye refers to the light of blue 2a, blue 2b, green 2a, green 2b, and red monochromatic light as shown in FIG. 12B through the right eye filter.

  As in this embodiment, the red peak wavelength can be arbitrarily set according to the design of the semiconductor laser by using red monochromatic light from red semiconductor lasers having different wavelengths as the left and right red images. For this reason, it is possible to make the wavelengths for the left eye and the right eye close to each other for a red image, and to reduce the difference in chromaticity between the left and right. In addition, in the UHP lamp, it is possible to obtain a good color reproduction with an excellent light quantity by the semiconductor laser light in the red color gamut, which is inferior in color reproduction compared to other color gamuts.

  In the present embodiment, when receiving the light projected on the screen, the wavelength is divided into two regions, the blue color 2 region and the green color 2 region, according to the spectrum of the UHP lamp. A spectacles filter capable of separating 645 nm and 635 nm is used.

<5. System configuration example>
FIG. 13 is a diagram illustrating a configuration example of a stereoscopic video display system to which the stereoscopic video display device according to the present embodiment is applied. The stereoscopic video display system includes a personal computer PC1 that supplies an image for the left eye, a personal computer PC2 that supplies an image for the right eye, a spectroscopic stereoscopic converter CV, a video output device 100 for the left eye, a video output unit 200 for the right eye, and a projection. A screen S is provided.

  The personal computer PC1 supplies image information for the left eye to the spectroscopic stereoscopic converter CV. Further, the personal computer PC2 supplies the image information for the right eye to the spectroscopic stereoscopic converter CV. In this example, two personal computers PC1 and PC2 are used. However, a single personal computer may supply both left and right image information to the spectroscopic stereoscopic converter CV.

  The spectroscopic stereoscopic converter CV has a function of converting image information output from the personal computers PC1 and PC2 into image information suitable for the video display device 100 for the supplied left and right image information. In addition, when the image information suitable for the video display apparatus 100 is output from the personal computers PC1 and PC2, the spectroscopic stereoscopic converter CV is not particularly necessary.

  The video output device 100 for the left eye corresponds to the first video output unit 10 of the stereoscopic video display device of the present embodiment, and the video output unit 200 for the right eye is the second video output device 200 of the stereoscopic video display device of the present embodiment. This corresponds to the video output unit 20. As described above, as described above, in addition to the main light source, a sub-light source is used as necessary, and the difference in chromaticity between the left and right images is suppressed.

  A spectral filter is provided on each video projection side of the video output device 100 for the left eye and the video output device 200 for the right eye. The spectral filter has the same characteristics as the left and right wavelength filters of the glasses used by the reference person. The video output device 100 for the left eye and the video output device 200 for the right eye are arranged adjacent to each other or arranged to overlap each other.

  In order to display a stereoscopic video with such a stereoscopic video display system, image information for the left eye and image information for the right eye are respectively supplied from the personal computers PC1 and PC2 to the spectroscopic stereoscopic converter CV. The spectroscopic stereoscopic converter CV converts the supplied image information for the left eye and image information for the right eye for spectroscopic stereoscopic viewing. Then, the converted left-eye image information is sent to the left-eye video output device 100, and the right-eye image information is sent to the right-eye video output device 200.

  The video output device for the left eye displays the video for the left eye on the projection screen S via the spectral filter for the left eye based on the sent image information for the left eye. The right-eye video output device 200 projects the right-eye video on the projection screen S via the right-eye spectral filter based on the transmitted right-eye image information.

  The reference person wears glasses equipped with filters having different spectral characteristics on the left and right, and refers to the image displayed on the projection screen S. As a result, the left and right eyes enter the left and right eyes in a state where the left eye image and the right eye image are separated, and are recognized as a stereoscopic view.

  By applying the video output units 10 and 20 of the present embodiment as the video output devices 100 and 200 in the stereoscopic video display system, it is possible to project a video with close chromaticity on the left and right, and the color reproducibility when stereoscopically viewed. Can be improved.

  As described above, according to the present embodiment, in the wavelength division filter method, it is possible to realize a stereoscopic image in which the difference in color reproduction between the left and right is almost eliminated. Further, in the wavelength division filter system, it is possible to suppress the difference in color reproduction only by changing the apparatus configuration without changing glasses. Compared to a configuration in which all the colors are replaced with lasers, the combination of the lamp and the red semiconductor laser light provides a sufficient merit at a low cost.

  Further, the spatial modulator applied in the projector according to the present embodiment does not depend on a spatial modulation system such as DMD or LCD (SXRD, transmissive LCD, reflective LCD). Further, the sub-light source is not limited to the laser light source as long as the difference between the left and right chromaticity regions can be filled. Further, although the sub-light source has been described by taking only red as an example, it may be applied to blue or green as long as the difference between the left and right chromaticity regions can be filled. The wavelength division is not limited to two divisions and three divisions, and the left and right images may be divided by further division.

  DESCRIPTION OF SYMBOLS 10 ... 1st video output part, 11 ... Main light source, 12 ... Sub light source, 13 ... Color separation part, 14 ... Projector, 15 ... Spatial modulator, 16 ... Wavelength synthesizer, 20 ... 2nd video output part, DESCRIPTION OF SYMBOLS 21 ... Main light source, 21 ... Sub light source, 23 ... Color separation part, 24 ... Projector, 25 ... Spatial modulator, 26 ... Wavelength synthesizer, G ... Glasses, S projection screen

Claims (5)

A main light source that generates white light, a sub-light source that generates red monochromatic light, a color separation unit that separates white light generated by the main light source into three wavelength bands of a red band, a green band, and a blue band, Image generation for generating the first image using the light in the green band, the light in the blue band among the light in the red band, the green band, and the blue band separated by the color separation unit, and the red monochromatic light generated by the sub-light source A first video display unit having a unit;
A main light source that generates white light, a color separation unit that separates white light generated by the main light source into three wavelength bands of a red band, a green band, and a blue band, and a red band and a green that are separated by the color separation unit A stereoscopic video display device comprising: a second video output unit having a video generation unit that generates a second video using light in a band and a blue band. A main light source that generates white light, a sub-light source that generates red monochromatic light, a color separation unit that separates white light generated by the main light source into three wavelength bands of a red band, a green band, and a blue band, Image generation for generating the first image using the light in the green band, the light in the blue band among the light in the red band, the green band, and the blue band separated by the color separation unit, and the red monochromatic light generated by the sub-light source A first video display unit having a unit;
A main light source that generates white light, a sub-light source that generates red monochromatic light, a color separation unit that separates white light generated by the main light source into three wavelength bands of a red band, a green band, and a blue band, Image generation for generating a second image using the light in the green band, the light in the blue band among the light in the red band, the green band, and the blue band separated by the color separation unit, and the red monochromatic light generated by the sub-light source And a second video display unit having a unit. The stereoscopic image display apparatus according to claim 1, wherein the sub-light source is a semiconductor laser light source. The white light generated by the main light source is separated into three wavelength bands of red band, green band, and blue band, and the separated red band, green band, blue band light, green band light, blue band light, and Generating a first image using red monochromatic light generated by the sub-light source;
Separating the white light generated by the main light source into three wavelength bands, a red band, a green band, and a blue band, and generating a second image using the separated red band, green band, and blue band lights; A stereoscopic image display method having the method. The white light generated by the main light source is separated into three wavelength bands of red band, green band, and blue band, and the separated red band, green band, blue band light, green band light, blue band light, and Generating a first image using red monochromatic light generated by the sub-light source;
The white light generated by the main light source is separated into three wavelength bands of red band, green band, and blue band, and the separated red band, green band, blue band light, green band light, blue band light, and A method of generating a second image using red monochromatic light generated by a sub-light source.

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