JP2004205919A - Projection type stereoscopic display device - Google Patents

Projection type stereoscopic display device Download PDF

Info

Publication number
JP2004205919A
JP2004205919A JP2002376663A JP2002376663A JP2004205919A JP 2004205919 A JP2004205919 A JP 2004205919A JP 2002376663 A JP2002376663 A JP 2002376663A JP 2002376663 A JP2002376663 A JP 2002376663A JP 2004205919 A JP2004205919 A JP 2004205919A
Authority
JP
Japan
Prior art keywords
light
polarization
spatial light
display device
spatial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002376663A
Other languages
Japanese (ja)
Inventor
Masanobu Shigeta
正信 茂田
Original Assignee
Victor Co Of Japan Ltd
日本ビクター株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Victor Co Of Japan Ltd, 日本ビクター株式会社 filed Critical Victor Co Of Japan Ltd
Priority to JP2002376663A priority Critical patent/JP2004205919A/en
Publication of JP2004205919A publication Critical patent/JP2004205919A/en
Pending legal-status Critical Current

Links

Images

Abstract

An object of the present invention is to improve the light utilization rate of a light source, improve the so-called "color breakup phenomenon", simplify the configuration, reduce the manufacturing cost, and achieve high definition in a "field sequential display system" projection type stereoscopic display device. To display a stereoscopic image.
A light source that emits white light, a color selection filter that selects a specific color component from light emitted from the light source, and light that has passed through the color selection filter are separated according to a polarization state. A wire grid 6, first and second display panels 9 and 14 on which light separated by the wire grid 6 is incident, respectively, and polarized light for combining light passing through the first and second display panels 9 and 14; It includes a beam splitter 10 and a projection lens 15 that projects the light combined by the polarization beam splitter 10. Each of the display panels 9 and 14 is supplied with a signal for displaying a left-eye image and a right-eye image.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a projection type stereoscopic display device that performs stereoscopic image display by projecting light spatially modulated according to two image signals having a difference corresponding to parallax between a left eye and a right eye of a viewer on a screen.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a projection type stereoscopic display device that spatially modulates projection light using a spatial light modulation element such as a liquid crystal display panel according to an image signal and projects the projection light on a screen to display a stereoscopic image has been proposed. . In the projection type stereoscopic display device, stereoscopic image display is performed by displaying two images having a difference corresponding to the parallax of the left and right eyes of the observer on a screen in a superimposed manner.
[0003]
As such a projection type stereoscopic display device, a so-called “three-panel system” including three spatial light modulation elements corresponding to primary color components of red (R), green (G), and blue (B) is provided. Is proposed.
[0004]
Further, as such a projection type stereoscopic display device, as shown in FIG. 7, a single spatial light modulation element (display device) 101 displays each primary color component in a time-division manner to realize color display. A so-called "field sequential display system" has been proposed.
[0005]
In such a projection type stereoscopic display device, light emitted from a light source 102 that emits white light is reflected by a parabolic mirror 103, collected through a condenser lens 104, guided to a light pipe 105, The light enters the color filter section of the color wheel 106. The color wheel 106 is formed in a disk shape that can be rotated around the center axis, and has red (R), green (G), and blue (B) color filter portions on the periphery of the disk. . The light transmitted through the color filter portion of the color wheel 106 enters the total reflection prism 109 via the mirror 107 and the relay lens 108.
[0006]
The light that has entered the total reflection prism 109 is reflected by the reflection surface 109 a in the total reflection prism 109, exits from the total reflection prism 109, and enters the spatial light modulator 101. The light that has entered the spatial light modulator 101 is subjected to intensity modulation by the spatial light modulator 101, is reflected, passes through a total reflection prism 109, and is incident on a projection lens (projection lens) 110. Then, the light incident on the projection lens 110 is projected on a screen 111 to display an image.
[0007]
In this projection type stereoscopic display device, the color wheel 106 is rotated at a predetermined cycle, and the light from the light source 102 passes through one of the red (R), green (G), and blue (B) color filter units. The light is transmitted in a time-division manner. When the light from the light source 102 is transmitted through the red (R) color filter unit, the spatial light modulation element 101 performs light modulation corresponding to the red component of the display image, and the light from the light source 102 is green. When the light is transmitted through the (G) color filter section, light modulation corresponding to the green component of the display image is performed. When the light from the light source 102 is transmitted through the blue (B) color filter section, the display image is displayed. Light modulation corresponding to the blue component is performed. Thus, a color image is displayed on the screen 111.
[0008]
By using two sets of the above-described devices and displaying two images having a difference corresponding to the parallax of the left and right eyes of the observer on a screen, a stereoscopic image display is performed. That is, the projection light for displaying one image is set as the vertically polarized light, and the projection light for displaying the other image is set as the horizontally polarized light. By observing through a polarizing plate that passes through, and observing light incident on the other eye through a polarizing plate that passes only horizontal polarized light, stereoscopic vision can be performed.
[0009]
The above-mentioned "field sequential display system" projection type stereoscopic display device uses one spatial modulation element and simplifies the configuration of an optical system for projecting an image of the spatial modulation element. Therefore, the device can be configured as a small, lightweight, and inexpensive device.
[0010]
Further, in such a “field sequential display method”, the number of pixels of a display image can be tripled as compared with a case where pixels corresponding to respective primary color components are planarly integrated on one panel. There is.
[0011]
In this projection type stereoscopic display device, since the light emitted from the light source 102 is cut by the color filter portion of the color wheel in 2/3 corresponding to the two primary colors, the light utilization rate is one primary color. Is equivalent to 1/3 or less.
[0012]
[Patent Document 1]
JP-A-10-304284
[Problems to be solved by the invention]
By the way, in the projection type stereoscopic display device as described above, a light source that emits white light, such as a xenon lamp or an ultra-high pressure mercury (UHP) lamp, is generally used. However, in the “field sequential display method” using a white light source, the light corresponding to the two primary colors that are not used is absorbed by the color filter and discarded, so to speak, there is a problem that the light utilization rate is low. The light utilization rate in this case is, in principle, 1/3 or less of the "three-plate system". Such low light utilization is a serious problem particularly in a projection type stereoscopic display device that performs a large-screen display.
[0014]
In the “field sequential display method”, a so-called “color breakup phenomenon” in which one of the primary colors is seen in a white portion when blinking or the like occurs.
[0015]
To eliminate this "color breakup phenomenon", the frame frequency of the displayed image may be increased. However, the frame frequency is limited by the response speed of the spatial light modulator. In addition, this "color breakup phenomenon" is seen even when the frame frequency is set to a high frequency of, for example, 300 Hz or more, when the timing of blinking matches when switching frames. Therefore, such a “color breakup phenomenon” is considered to be a fate that cannot be solved by the “field sequential display method”.
[0016]
By the way, as a spatial light modulation element used in a projection type stereoscopic display device, a liquid crystal display device using liquid crystal as a modulating substance and a “DMD” (micromirror device) using a micromirror are known.
[0017]
Liquid crystal display devices have the advantage that they have a long track record and can be manufactured relatively easily. In addition, the liquid crystal display device can achieve higher definition (higher resolution) by enlarging the panel surface. Resolution (number of display pixels) is one of the important performances of a display device.
[0018]
However, the liquid crystal display device has a low response speed, and does not have sufficient performance to be used as it is in the “field sequential display method”. In addition, the light incident on the liquid crystal display device must be polarized light, and there are problems such as a decrease in contrast ratio due to polarization loss and birefringence, and uneven illuminance (density) in a displayed image. Further, the use of the liquid crystal display device has a problem that the cost including the optical system is increased.
[0019]
A reflection type liquid crystal device is known as a liquid crystal device having a relatively high response speed and advantageous for high definition. However, when this reflective liquid crystal device is used, the configuration of the optical system becomes complicated, and the spectral characteristics of the polarizing beam splitter (PBS) included in the optical system and the birefringence of the optical material cause the display image to be displayed. There is a problem that characteristics are affected.
[0020]
On the other hand, the “DMD” is an element that directly modulates the intensity of incident light by individually changing the directions of micromirrors corresponding to pixels, and does not require that incident light be polarized light, and has a sufficiently high response speed. Therefore, this “DMD” is optimal as a spatial light modulator used for the “field sequential display system”.
[0021]
However, this “DMD” has a problem that it is difficult to manufacture, and in particular, it is difficult to achieve high definition. As shown in FIG. 8, for example, as shown in FIG. 8, four projection stereoscopic display devices 112 are installed by using “DMD” which can be produced at present and increasing the resolution of a display image in the projection display device. A configuration is conceivable in which images obtained by dividing a display image into four by the respective projection display devices 112 are displayed, and these images are connected on the screen 111.
[0022]
In such a configuration, not only is the size and price of the device approximately four times as large as one projection display device 112, but also the display characteristics of the four projection display devices 112 are made uniform, It is difficult to make adjustments to make the joints inconspicuous, and it is not easy to cope with changes over time. Further, in order to perform stereoscopic (so-called "3D") display, twice as many (eight) projection display devices are required.
[0023]
Japanese Patent Application Laid-Open No. 10-304284 discloses a configuration in which stereoscopic image display is performed by one projection display device, or a so-called pixel shift (two or more images are prepared for the same display image, and the pixels are shifted from each other. (Overlapping display) to increase the resolution. However, even if these configurations are applied as they are, a high-resolution stereoscopic image cannot be displayed.
[0024]
Also in this case, since the number of the spatial light modulators is large, there is a problem that it is difficult to adjust a spatial position between the spatial light modulators in addition to an increase in manufacturing cost.
[0025]
Therefore, the present invention has been proposed in view of the above situation, and the light utilization rate of the light source has been improved, and the so-called “color breakup phenomenon” which is a drawback of the “field sequential display method” has been improved. However, it is an object of the present invention to provide a projection type stereoscopic display device that has a simplified configuration, lowers manufacturing costs, and can perform high-definition (high resolution) and favorable stereoscopic image display.
[0026]
[Means for Solving the Problems]
In order to solve the above-described problem, a projection type stereoscopic display device according to the present invention includes a white light source and a time-divisional selection of a specific color component from light emitted from the light source, and the selected color component. Polarization splitting means for splitting the light into first and second polarization states, and first and second spatial light modulators on which the first and second polarized lights separated by the polarization splitting means are respectively incident. A light combining means for combining the light modulated by the first and second spatial light modulators, and a projecting means for projecting the light combined by the light combining means. The spatial light modulator displays an image having a difference corresponding to the parallax of the left and right eyes of the observer.
[0027]
The present invention provides a white light source, first polarization conversion means for converting light emitted from the light source into a first polarization component, and first polarization of a specific color component from light passing through the first polarization conversion means. A second polarization converter that outputs a state as a second polarization state, a polarization separator that separates the light having passed through the first and second polarization converters according to the first and second polarization states, First and second spatial light modulators into which the light separated by the separator is incident, light combining means for combining the lights respectively modulated by the first and second spatial light modulators, and the light combining Projecting means for projecting light synthesized by the means, wherein the first and second spatial light modulators display images having a difference corresponding to the parallax of the left and right eyes of the observer. Is preferred.
[0028]
The first and second spatial light modulating elements are composed of a plurality of pixels in a matrix, and a position adjusting means for adjusting the position of the second spatial light modulating element with respect to the first spatial light modulating element It is preferable to cause pixel shift in the projected image.
[0029]
By using the first and second spatial light modulators, even when a “DMD” (micromirror device) is used as these spatial light modulators, high definition (high resolution) can be achieved without complicating the configuration. It is possible to display a stereoscopic image having a high resolution. In addition, since the light combining means for combining the light having passed through the first and second spatial light modulators is used, there is no need to combine images on a screen, and installation and adjustment of the device are facilitated.
[0030]
The color selecting means and the separating means select and separate a specific color component from the light emitted from the light source, and the separated light enters the first and second spatial light modulation elements, respectively. The so-called "color break phenomenon", which is a drawback of the "field sequential display method", is improved while the rate is improved. In addition, it is possible to display a high-definition (high-resolution) stereoscopic image, and it is not necessary to combine images on a screen, which facilitates installation and adjustment of the apparatus.
[0031]
The first and second spatial light modulating elements are arranged at positions where pixels constituting the image are shifted by a half pixel pitch in an oblique 45 ° direction in an image of each of the spatial light modulating elements projected by the projecting means. It is preferred that
[0032]
Since the pixels of the image displayed by the first and second spatial light modulators are shifted by a half pixel pitch in the diagonal direction of 45 °, a high-definition (high-resolution) stereoscopic image can be displayed. .
[0033]
It is preferable that at least one of the first and second spatial light modulators is supported by a moving mechanism and is movable at least by a half pixel pitch in a direction parallel to the light incident surface.
[0034]
A state in which pixels of an image displayed by the first and second spatial light modulation elements are shifted by a half pixel pitch in the oblique direction at an angle of 45 ° can be easily achieved and maintained, and a high-definition (high resolution) solid The state in which image display can be performed can be easily maintained.
[0035]
The first and second spatial light modulators are image signals obtained by thinning image signals having a resolution twice as high as the resolution of these spatial light modulators in the vertical and / or horizontal directions. Image signals that are complementary to each other are supplied to each of them.
[0036]
The observer observes the images complementary to each other with the right and left eyes, and can observe a high-definition (high-resolution) and good stereoscopic image.
[0037]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0038]
[First Embodiment]
The projection type stereoscopic display device according to the present invention has a light source 1 as shown in FIG. As the light source 1, a light source that emits white light, such as a xenon lamp or an ultra-high pressure mercury (UHP) lamp, can be used, but at least red (R) and green (G) even if the spectral component is not uniform white light. And any light that emits light containing a blue (B) component.
[0039]
The light emitted from the light source 1 is reflected by the parabolic mirror 2, condensed through the condenser lens 3, guided to the light pipe 4, and made incident on the color filter section of the color wheel 5. The color wheel 5 is formed in a disk shape that can be rotated around a center axis, and has red (R), green (G), and blue (B) color filter units on the peripheral side of the disk. . The red color filter section transmits the red component and absorbs the green and blue components. The green color filter transmits the green component and absorbs the blue and red components. The blue color filter section transmits the blue component and absorbs the red and green components. The light transmitted through the color filter section of the color wheel 5 enters a wire grid type PBS 6.
[0040]
The wire grid type PBS 6 reflects one of the P-polarized component and the S-polarized component of the incident light and transmits the other. Whether the wire grid type PBS 6 reflects the P-polarized light component or the S-polarized light component depends on how to install the wire grid type PBS 6 with reference to the direction of inclination with respect to the optical axis (grid direction). In this embodiment, the P-polarized light component of the incident light of the wire grid type PBS 6 is reflected by the wire grid type PBS 6, and the S polarized light component passes through the wire grid type PBS 6.
[0041]
The P-polarized light component reflected by the wire grid type PBS 6 enters the total reflection prism 8 via the relay lens 7. The light that has entered the total reflection prism 8 is reflected by the reflection surface 8a in the total reflection prism 8, exits from the total reflection prism 8, and enters the first spatial light modulator 9. The light incident on the first spatial light modulator 9 is intensity-modulated by the first spatial light modulator 9 and reflected, passes through the total reflection prism 8, and is transmitted to the polarization beam splitter (PBS) 10. Incident.
[0042]
The first spatial light modulation element 9 is a so-called “DMD” and includes a number of micromirrors corresponding to pixels. In this "DMD", the intensity of the incident light is directly modulated by individually changing the direction of each micromirror according to the display image. Light incident on the “DMD” does not need to be polarized light, and the response speed is sufficiently fast.
[0043]
Light incident on the polarization beam splitter 10 from the first spatial light modulator 9 is P-polarized light with respect to the reflection surface 10a of the polarization beam splitter 10, and transmits through this reflection surface.
[0044]
On the other hand, the S-polarized light component transmitted through the wire grid type PBS 6 is incident on the total reflection prism 13 via the mirror 11 and the relay lens 12. The light that has entered the total reflection prism 13 is reflected by the reflection surface 13 a in the total reflection prism 13, exits from the total reflection prism 13, and enters the second spatial light modulator 14. The light incident on the second spatial light modulator 14 is subjected to intensity modulation by the second spatial light modulator 14 and reflected, passes through the total reflection prism 13, and is transmitted to the polarization beam splitter (PBS) 10. Incident. The second spatial light modulator 14 is also a so-called “DMD”, like the first spatial light modulator 9.
[0045]
Light incident on the polarization beam splitter 10 from the second spatial light modulator 14 is S-polarized with respect to the reflection surface 10a of the polarization beam splitter 10, and is reflected by the reflection surface.
[0046]
Therefore, the light from the first spatial light modulator 9 and the light from the second spatial light modulator 14 are combined on the reflection surface 10 a of the polarization beam splitter 10. The light combined in the polarization beam splitter 10 in this manner is emitted from the polarization beam splitter 10 and enters a projection lens (projection lens) 15. Then, the light incident on the projection lens 15 is projected on a screen 16 to display an image.
[0047]
The projection type stereoscopic display device is a display device of a so-called “field sequential display method”, in which a color wheel 5 is rotated at a predetermined cycle, and light from the light source 1 is red (R) and green (G). And blue (B) color filters are transmitted in a time-division manner. When the light from the light source 1 is transmitted through the red (R) color filter section, the first and second spatial light modulators 9 and 14 perform light modulation corresponding to the red component of the display image. When the light from the light source 1 is transmitted through the green (G) color filter unit, light modulation corresponding to the green component of the display image is performed, and the light from the light source 1 passes through the blue (B) color filter unit. When transmitting, light modulation corresponding to the blue component of the display image is performed. Thus, a color image is displayed on the screen 16.
[0048]
By the way, in this projection type stereoscopic display device, the first and second spatial modulation elements 9 and 14 are positioned and fixed so that the images displayed by each of them overlap on the screen 16 with a predetermined accuracy. Here, a configuration in which the first and second spatial modulation elements 9 and 14 in the projection type stereoscopic display device are positioned and fixed will be described.
[0049]
One spatial light modulating element, in this embodiment, the first spatial light modulating element 9 is fixedly disposed on the optical stage. As shown in FIG. 2, the other spatial modulation element, the second spatial modulation element 14 in this embodiment, is movably supported in a frame 17 fixedly disposed on an optical stage (not shown). Mounted on the panel holder 18. The panel holder 18 has one side edge and a lower edge portion of the panel surface (display surface) in the frame 17 pressed and supported by pressing springs 19 and 20 attached to the frame 17, and the other side of the panel surface. The side edge and the upper edge are supported by the distal ends of the screw shafts 21 a and 22 a of the stepping motors 21 and 22 attached to the frame 17. The screw shafts 21a and 22a of the stepping motors 21 and 22 are moved in the forward and backward directions with respect to the panel holder 18 in the frame 17 by driving the respective stepping motors 21 and 22.
[0050]
That is, in the frame 17, an actuator for moving the second spatial modulation element 14 with respect to the optical stage by driving the stepping motors 21 and 22 is configured. When each of the stepping motors 21 and 22 is driven, the panel holder 18 is sandwiched between the screw shaft 21a of the stepping motor 21 and the pressing spring 19 in the X direction (horizontal direction in FIG. 2), and in the Y direction (FIG. In the middle longitudinal direction, the moving operation is performed in the X direction and / or the Y direction while being sandwiched between the screw shaft 22a of the stepping motor 22 and the pressing spring 20.
[0051]
FIG. 2 shows a configuration in which two stepping motors are provided in each of the X direction and the Y direction. By individually driving these two stepping motors, rotation, that is, rotation (tilt) adjustment about an axis perpendicular to the panel surface is also possible.
[0052]
In actual production, first, the frame 17 is positioned while displaying a stereoscopic image by the second spatial modulation element 14, and is fixed to the optical stage by soldering or the like. The alignment at this time does not need to be accurately adjusted with respect to the pixels of the other spatial modulation element (first spatial modulation element 9), but it is preferable that the alignment be made within one pixel pitch.
[0053]
In this projection type stereoscopic display device, the image signals input to the spatial light modulators 9 and 14 are, as shown in FIG. 4, an original image L of a left-eye image to be displayed and a right-eye image. The signal is a signal for displaying an image thinned out to half the resolution of the original image of the use image R. The image signals input to the spatial light modulators 9 and 14 complement each other to form a set of a left-eye image L and a right-eye image R. That is, with respect to a set of image signals of the left-eye image L and the right-eye image R, information of each of rows and columns is alternately sorted and supplied to each of the spatial light modulators 9 and 14. For example, the first spatial light modulating element 9 includes the first row, third row, fifth row,... (Odd-numbered rows) of the first column, third column, fifth column,. (Odd column) information is supplied to the second spatial light modulator 14, the second column of the right-eye image, the fourth column, the sixth column,. The information in the fourth, sixth,... Columns (even columns) is supplied. FIG. 4 shows images input to the respective spatial light modulators 9 and 14 when the resolution is doubled only in the vertical direction.
[0054]
As shown in FIG. 1, the images displayed by the spatial light modulators 9 and 14 are complemented by being combined in a polarizing beam splitter 10, and set on a screen 16 via a projection lens 15. Are displayed for the left eye and the right eye.
[0055]
Then, the observer of the stereoscopic display image wears so-called “polarized glasses”, observes light incident on one eye through a polarizing plate that transmits only vertical polarized light, and horizontally observes light incident on the other eye. By observing through a polarizing plate that transmits only polarized light in the direction, stereoscopic vision can be performed. Actually, each eye sees an image with a resolution that is decimated in half, but since it is complemented in the head, it looks like a high-resolution image.
[0056]
In this projection type stereoscopic display device, if the mounting accuracy of the spatial light modulators 9 and 14 is not sufficient, a predetermined resolution may not be obtained in an actually projected image. For example, when the pixel pitch in the spatial light modulators 9 and 14 is 13.8 μm, the pixel pitch of the original image is 6.9 μm. Therefore, if one of the spatial light modulators is shifted vertically or horizontally by 6.9 μm (a half pitch of the pixel pitch in the spatial light modulator) from a predetermined position, the effect of improving the resolution will not be achieved in principle. Will be gone. Actually, if the positional accuracy that the deviation from the predetermined position is 3 μm or less is secured, there is an effect of improving the resolution.
[0057]
In this embodiment, when the temperature in the display device is stabilized, for example, as shown in FIG. 3, an image signal for displaying a predetermined pattern A corresponding to the pixel of the spatial light modulation element is transmitted to each spatial light modulation device. The image is supplied to the elements 9 and 14, an image based on the image signal is displayed on the screen 16, and the actuator is adjusted while watching the image. That is, the position of the spatial light modulator is shifted such that the pattern A displayed by one spatial light modulator and the pattern A 'displayed by the other spatial light modulator are shifted by half a pixel of the spatial light modulator. adjust.
[0058]
The position of the spatial light modulator also shifts due to a change in temperature. However, by appropriately devising the material of the member supporting the spatial light modulator and the fixing method, the positional accuracy of the spatial light modulator can be suppressed to within several μm. In this case, once adjusted in a steady state, there is no practical problem.
[0059]
If the position of the spatial light modulator shifts due to aging or striking, readjustment is required. In this projection type stereoscopic display device, since at least one of the spatial light modulation elements is movably supported by the actuator, the position can be easily adjusted and corrected, and the highest resolution can always be maintained. ing.
[0060]
[Second embodiment]
FIG. 5 shows a second embodiment of the projection type stereoscopic display apparatus according to the present invention.
[0061]
In the projection type stereoscopic display device, light emitted from the light source 1 is reflected by the parabolic mirror 2, condensed through the condenser lens 3, and converted into polarized light in one predetermined direction by the polarization conversion element 23. After that, the light enters the color separation element 24.
[0062]
The polarization conversion element 23 has a polarization separation prism array and a λ / 2 retardation plate, and is configured as a flat plate as a whole. That is, the light incident on the polarization conversion element 23 from the front side is first converted into a P-polarized light component and an S-polarized light with respect to the polarization beam splitter film surface by the polarization beam splitter film surface of the polarization separation prism array. It is separated into polarized light components. The polarization beam splitter film surface is provided in a plurality of parallel stripes in the polarization conversion element 23, and each has a 45 ° inclination with respect to the main surface of the polarization conversion element 23. On this polarization beam splitter film surface, the P-polarized light component is transmitted and emitted to the back side of the polarization conversion element 23, and the S-polarized light component is reflected. The S-polarized light component reflected by one polarizing beam splitter film surface has its optical path bent by 90 °, is reflected again by another adjacent polarizing beam splitter film surface and has its optical path bent by 90 °, and the polarization conversion element 23 The light is emitted to the back side. A λ / 2 retardation plate is provided in a region from which the S-polarized component is emitted. The polarization direction of the S-polarized light component transmitted through the λ / 2 retardation plate is rotated by 90 °, and is changed to the same polarization direction as the P-polarized light component transmitted through the polarization beam splitter film surface.
[0063]
In this manner, the light transmitted through the polarization conversion element 23 is polarized in one predetermined direction.
[0064]
The color separation element 24 has a function of converting the polarization axis of the primary color component to be separated into a direction orthogonal to the polarization axis of the incident light beam. That is, the color separation element 24 can transmit one primary color component and another primary color component of the incident light as light in polarization directions orthogonal to each other. Further, in the color separation element 24, by applying a predetermined voltage, it is possible to select a primary color component to be transmitted by changing the polarization direction and a primary color component to be transmitted without changing the polarization direction.
[0065]
Such a color separation element can be configured by laminating retardation plates. Such a color separation element is reported in, for example, “SlD99 Digest (pages 1072 to 1075)”, and, for example, “Color Select” (product) by Color Link. It is such a color separation element that is sold under the name.
[0066]
The light emitted from the color separation element 24 is incident on the wire grid type PBS 6. As described above, the wire grid type PBS 6 reflects one of the P-polarized component and the S-polarized component of the incident light and transmits the other. In this embodiment, the P-polarized light component of the incident light of the wire grid type PBS 6 is reflected by the wire grid type PBS 6, and the S polarized light component passes through the wire grid type PBS 6.
[0067]
The emitted light from the color separation element 24 has a state in which the polarization direction of one primary color component and the polarization direction of the other primary color component are orthogonal to each other. Is reflected (or transmitted), and another primary color component is transmitted (or reflected).
[0068]
One primary color component, which is a P-polarized light component reflected by the wire grid type PBS 6, enters the total reflection prism 8 via the relay lens 7. The light that has entered the total reflection prism 8 is reflected by the reflection surface 8a in the total reflection prism 8, exits from the total reflection prism 8, and enters the first spatial light modulator 9. The light incident on the first spatial light modulator 9 is intensity-modulated by the first spatial light modulator 9 and reflected, passes through the total reflection prism 8, and is transmitted to the polarization beam splitter (PBS) 10. Incident. The first spatial light modulator 9 is a so-called “DMD” as described above.
[0069]
Light incident on the polarization beam splitter 10 from the first spatial light modulator 9 is P-polarized light with respect to the reflection surface 10a of the polarization beam splitter 10, and transmits through this reflection surface.
[0070]
On the other hand, another primary color component, which is the S-polarized component transmitted through the wire grid type PBS 6, enters the total reflection prism 13 via the mirror 11 and the relay lens 12. The light that has entered the total reflection prism 13 is reflected by the reflection surface 13 a in the total reflection prism 13, exits from the total reflection prism 13, and enters the second spatial light modulator 14. The light incident on the second spatial light modulator 14 is subjected to intensity modulation by the second spatial light modulator 14 and reflected, passes through the total reflection prism 13, and is transmitted to the polarization beam splitter (PBS) 10. Incident. The second spatial light modulator 14 is also a so-called “DMD”, like the first spatial light modulator 9.
[0071]
Light incident on the polarization beam splitter 10 from the second spatial light modulator 14 is S-polarized with respect to the reflection surface 10a of the polarization beam splitter 10, and is reflected by the reflection surface.
[0072]
In this manner, the light from the first spatial light modulator 9 and the light from the second spatial light modulator 14 are combined on the reflection surface 10a of the polarization beam splitter 10. The light combined in the polarization beam splitter 10 is emitted from the polarization beam splitter 10 and projected on a screen 16 by a projection lens 15 to display an image.
[0073]
This projection type stereoscopic display device is a display device of a so-called “field sequential display method”, and the color separation element 24 converts, for example, a P-polarized light component for the wire grid type PBS 6 into R (red) -G (green)- When the light is switched and emitted in the order of B (blue) -R-G-B..., The S-polarized light component for the wire grid type PBS 6 is converted into G (green) -B (blue) -R (red) -G- It is driven so as to satisfy BR.
[0074]
When the light emitted from the color separation element 24 is switched in this manner, any two primary color components of the light from the light source 1 are always used for stereoscopic image display, and the light utilization rate is usually Is about twice as large as the “field sequential display method”.
[0075]
Therefore, in this projection type stereoscopic display device, a bright and high-definition image can be displayed, and the display time for one primary color component is twice as long as that of the normal “field sequential display method” (ie, , The disappearance time is)), so that the so-called “color breakup phenomenon” can be reduced.
[0076]
Also in this embodiment, the first and second spatial modulation elements 9 and 14 have a resolution of 解像度 of the resolution of the original image of the left-eye image and the original image of the right-eye image to be displayed. A signal is supplied that displays images that are decimated and complement each other.
[0077]
Further, the first and second spatial modulation elements 9 and 14 are positioned and fixed so that the images displayed by each of them overlap on the screen 16 with a predetermined accuracy. In addition, at least one of the spatial modulation elements is supported by an actuator so as to be movable, as in the above-described embodiment.
[0078]
[Third Embodiment]
FIG. 6 shows a third embodiment of the projection type stereoscopic display apparatus according to the present invention.
[0079]
In this projection type stereoscopic display device, light emitted from a light source 1 is reflected by a parabolic mirror 2, condensed through a condensing lens 3, guided to a light pipe 4, and subjected to a color filter of a color wheel 5. Part. The color wheel 5 is formed in a disk shape that can be rotated around a center axis, and has red (R), green (G), and blue (B) color filter units on the peripheral side of the disk. . The characteristics of each filter section are such that one primary color component is transmitted, the other primary color component is reflected, and the remaining one primary color component is absorbed. For example, a red color filter unit transmits a red component, reflects a blue component, and absorbs a green component. The green color filter transmits the green component, reflects the red component, and absorbs the blue component. The blue color filter transmits the blue component, reflects the green component, and absorbs the red component.
[0080]
One primary color component reflected by the color filter unit of the color wheel 5 is converted into polarized light in one predetermined direction by the polarization conversion element 25, and then enters the total reflection prism 8 via the relay lens 7. The light that has entered the total reflection prism 8 is reflected by the reflection surface 8a in the total reflection prism 8, exits from the total reflection prism 8, and enters the first spatial light modulator 9. The light incident on the first spatial light modulator 9 is intensity-modulated by the first spatial light modulator 9 and reflected, passes through the total reflection prism 8, and is transmitted to the polarization beam splitter (PBS) 10. Incident. The first spatial light modulator 9 is a so-called “DMD” as described above.
[0081]
Light incident on the polarization beam splitter 10 from the first spatial light modulator 9 is P-polarized with respect to the reflection surface 10a of the polarization beam splitter 10, and transmits through the reflection surface.
[0082]
On the other hand, another primary color component transmitted through the color filter portion of the color wheel 5 is converted into polarized light in one predetermined direction by the polarization conversion element 26 through the mirror 11, and then is totally reflected by the relay lens 12. The light enters the prism 13. The light that has entered the total reflection prism 13 is reflected by the reflection surface 13 a in the total reflection prism 13, exits from the total reflection prism 13, and enters the second spatial light modulator 14. The light incident on the second spatial light modulator 14 is subjected to intensity modulation by the second spatial light modulator 14 and reflected, passes through the total reflection prism 13, and is transmitted to the polarization beam splitter (PBS) 10. Incident. The second spatial light modulator 14 is also a so-called “DMD”, like the first spatial light modulator 9.
[0083]
Light incident on the polarization beam splitter 10 from the second spatial light modulator 14 is S-polarized with respect to the reflection surface 10a of the polarization beam splitter 10, and is reflected by the reflection surface.
[0084]
In this manner, the light from the first spatial light modulator 9 and the light from the second spatial light modulator 14 are combined on the reflection surface 10a of the polarization beam splitter 10. The light combined in the polarization beam splitter 10 is emitted from the polarization beam splitter 10 and projected on a screen 16 by a projection lens 15 to display an image.
[0085]
This projection type stereoscopic display device is also a display device of a so-called “field sequential display method”. However, due to the characteristics of the color filter section of the color wheel 5 described above, any two primary colors of the light from the light source 1 are used. The components are always used for stereoscopic image display. For this reason, the light utilization rate of this projection type stereoscopic display device is about twice as large as that of a normal “field sequential display method”.
[0086]
Therefore, in this projection type stereoscopic display device, a bright and high-definition image can be displayed, and the display time for one primary color component is twice as long as that of the normal “field sequential display method” (ie, , The disappearance time is)), so that the so-called “color breakup phenomenon” can be reduced.
[0087]
Also in this embodiment, the first and second spatial modulation elements 9 and 14 have a resolution of 解像度 of the resolution of the original image of the left-eye image and the original image of the right-eye image to be displayed. A signal is supplied that displays images that are decimated and complement each other.
[0088]
Further, the first and second spatial modulation elements 9 and 14 are positioned and fixed so that the images displayed by each of them overlap on the screen 16 with a predetermined accuracy. In addition, at least one of the spatial modulation elements is supported by an actuator so as to be movable, as in the above-described embodiment.
[0089]
In each of the above-described embodiments, a moving operation mechanism for shifting a pixel by a half pixel pitch is provided. However, when high resolution is not required, such a moving operation mechanism becomes unnecessary. Also in this case, the light utilization rate can be improved, and the so-called “color breakup phenomenon” can be reduced.
[0090]
Note that, in the projection type stereoscopic display device according to the present invention, the light from the light source is separated according to the polarization component, or the polarization direction of the separated light is aligned. This is to prevent a loss when the combined light is combined again. In the case of "DMD" which does not originally require the incidence of polarized light, the display performance does not change depending on the quality of the polarization state, unlike a liquid crystal display device. That is, in the projection type stereoscopic display device, the contrast ratio of the displayed image hardly deteriorates due to the characteristics of the optical components such as the polarization beam splitter. Therefore, in this projection type stereoscopic display device, high-quality stereoscopic image display can be performed without using expensive optical components having high-precision polarization characteristics.
[0091]
As described above, in the projection type stereoscopic display device of the present embodiment, two spatial light modulators capable of displaying a full-color image by the “field sequential display method” are used, and pixels of these display images are shifted from each other. Thus, the resolution of the displayed image can be easily doubled. Further, by distributing the two primary color components to the two spatial light modulation elements, it is possible to improve the deterioration of the light utilization rate and the so-called "color breakup phenomenon" which are disadvantages of the "field sequential display system".
[0092]
Further, according to the present embodiment, unlike a system in which projection light from a plurality of projection type stereoscopic display devices is combined on a screen, one projection type stereoscopic display device has already output two spatial light modulators from one spatial light modulation element. Since the combined light is projected by one projection lens, even if the projection distance is changed, adjustment other than focus adjustment (focus) is not required, and the movement of the apparatus is facilitated.
[0093]
【The invention's effect】
The present invention improves the light utilization rate of the light source and improves the so-called "color breakup phenomenon", which is a drawback of the "field sequential display system", while simplifying the configuration and reducing the manufacturing cost, and Another object of the present invention is to provide a projection stereoscopic display device capable of displaying a high-definition (high-resolution) and good stereoscopic image.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration (first embodiment) of a projection type stereoscopic display device according to the present invention.
FIG. 2 is a front view showing a configuration of a mechanism for supporting a spatial light modulation element in the projection type stereoscopic display device.
FIG. 3 is a front view showing a positional relationship between pixels of an image from first and second spatial light modulators in the projection type stereoscopic display device.
FIG. 4 is a front view showing a relationship between images displayed by image signals supplied to first and second spatial light modulation elements of the projection type stereoscopic display device.
FIG. 5 is a plan view showing a configuration (a second embodiment) of a projection type stereoscopic display device according to the present invention.
FIG. 6 is a plan view showing a configuration (third embodiment) of a projection type stereoscopic display device according to the present invention.
FIG. 7 is a plan view showing a configuration of a conventional projection type stereoscopic display device.
FIG. 8 is a perspective view showing another example of the configuration of a conventional projection stereoscopic display device.
[Explanation of symbols]
1 light source 5 color wheel 6 wire grid type PBS
9 First Spatial Light Modulator 10 Polarizing Beam Splitter 14 Second Spatial Light Modulator 15 Projection Lens 21, 22 Stepping Motor 24 Color Separation Element

Claims (3)

  1. A white light source,
    A polarization separation unit that time-divisionally selects a specific color component from the light emitted from the light source, and separates the light of the selected color component into first and second polarization states;
    First and second spatial light modulators on which the first and second polarized lights separated by the polarized light separating means are respectively incident;
    Light combining means for combining light modulated by the first and second spatial light modulators, respectively;
    Projection means for projecting the light synthesized by the light synthesis means,
    The projection type stereoscopic display device, wherein the first and second spatial light modulators display images having a difference corresponding to a parallax between a left eye and a right eye of an observer.
  2. A white light source,
    First polarization conversion means for converting light emitted from the light source into a first polarization component;
    A second polarization converter that outputs a first polarization state of a specific color component as a second polarization state from the light that has passed through the first polarization converter;
    Polarization separating means for separating the light having passed through the first and second polarization converting means according to first and second polarization states;
    First and second spatial light modulators on which the light separated by the polarization splitting means is respectively incident;
    Light combining means for combining light modulated by the first and second spatial light modulators, respectively;
    Projection means for projecting the light synthesized by the light synthesis means,
    The projection type stereoscopic display device, wherein the first and second spatial light modulators display images having a difference corresponding to a parallax between a left eye and a right eye of an observer.
  3. The first and second spatial light modulators each include a plurality of pixels arranged in a matrix, and a position adjusting unit that adjusts the position of the second spatial light modulator with respect to the first spatial light modulator. The projection type stereoscopic display device according to claim 1, wherein a pixel shift is generated in a projection image by the method.
JP2002376663A 2002-12-26 2002-12-26 Projection type stereoscopic display device Pending JP2004205919A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002376663A JP2004205919A (en) 2002-12-26 2002-12-26 Projection type stereoscopic display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002376663A JP2004205919A (en) 2002-12-26 2002-12-26 Projection type stereoscopic display device

Publications (1)

Publication Number Publication Date
JP2004205919A true JP2004205919A (en) 2004-07-22

Family

ID=32814069

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002376663A Pending JP2004205919A (en) 2002-12-26 2002-12-26 Projection type stereoscopic display device

Country Status (1)

Country Link
JP (1) JP2004205919A (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007163901A (en) * 2005-12-14 2007-06-28 Fuji Electric Device Technology Co Ltd Display device for three-dimensional stereoscopic image
WO2007139340A1 (en) 2006-05-29 2007-12-06 Seven Data Co., Ltd Structure of stereo optical engine for projection
JP2008546040A (en) * 2005-06-10 2008-12-18 カラーリンク・インコーポレイテッドColorlink, Inc. 3D stereoscopic projection architecture
KR100924086B1 (en) * 2008-01-29 2009-11-02 (주)캐스트원 Projection System for Three-dimensional Image Photographing
US20100026910A1 (en) * 2006-12-19 2010-02-04 Thomson Licensing High resolution dmp projection system
JP2010145431A (en) * 2008-12-16 2010-07-01 Nippon Hoso Kyokai <Nhk> Optical system and projection display device
JP2010526337A (en) * 2007-04-25 2010-07-29 トムソン ライセンシングThomson Licensing High resolution 3D projection system
CN101859052A (en) * 2009-04-01 2010-10-13 精工爱普生株式会社 Projector
KR101043253B1 (en) 2010-02-18 2011-06-21 재단법인대구경북과학기술원 Three-dimensional image display apparatus
CN102591029A (en) * 2011-04-26 2012-07-18 浙江亿思达显示科技有限公司 3D projection optical system and dual chip light splitting and light integrating model thereof
CN102650741A (en) * 2012-03-16 2012-08-29 京东方科技集团股份有限公司 Light splitting device, manufacturing method thereof and 3D (Three-Dimensional) display device
JP2012203294A (en) * 2011-03-28 2012-10-22 Ushio Inc Polarization element unit and polarization light irradiation apparatus
CN101878655B (en) * 2007-11-30 2013-02-06 伊斯曼柯达公司 Stereo projection apparatus
US8696135B2 (en) 2007-06-25 2014-04-15 Thomson Licensing Video recording prevention system
WO2014064743A1 (en) * 2012-10-22 2014-05-01 Necディスプレイソリューションズ株式会社 Projector
WO2015073838A1 (en) * 2013-11-15 2015-05-21 Reald Inc. High dynamic range, high contrast projection systems
US9360609B2 (en) 2006-12-18 2016-06-07 Thomson Licensing 2D/3D projector with rotating translucent cylinder for alternating light polarisation
CN105988268A (en) * 2015-01-27 2016-10-05 深圳市绎立锐光科技开发有限公司 Projection imaging system
US9584780B2 (en) 2012-12-27 2017-02-28 Nec Display Solutions, Ltd. Projector and controlling method of the same
WO2019225052A1 (en) * 2018-05-22 2019-11-28 株式会社Jvcケンウッド Projector and multi-projection system

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008546040A (en) * 2005-06-10 2008-12-18 カラーリンク・インコーポレイテッドColorlink, Inc. 3D stereoscopic projection architecture
JP4605507B2 (en) * 2005-12-14 2011-01-05 富士電機デバイステクノロジー株式会社 Three-dimensional stereoscopic image display device
JP2007163901A (en) * 2005-12-14 2007-06-28 Fuji Electric Device Technology Co Ltd Display device for three-dimensional stereoscopic image
EP2030071A4 (en) * 2006-05-29 2010-11-17 Seven Data Co Ltd Structure of stereo optical engine for projection
EP2030071A1 (en) * 2006-05-29 2009-03-04 Seven Data Co. Ltd. Structure of stereo optical engine for projection
JP2009539138A (en) * 2006-05-29 2009-11-12 レッドローバー カンパニー,リミテッド Structure of stereo optical engine for projection
WO2007139340A1 (en) 2006-05-29 2007-12-06 Seven Data Co., Ltd Structure of stereo optical engine for projection
US9360609B2 (en) 2006-12-18 2016-06-07 Thomson Licensing 2D/3D projector with rotating translucent cylinder for alternating light polarisation
US20100026910A1 (en) * 2006-12-19 2010-02-04 Thomson Licensing High resolution dmp projection system
US8334935B2 (en) 2006-12-19 2012-12-18 Thomson Licensing High resolution DMD projection system
JP2010526337A (en) * 2007-04-25 2010-07-29 トムソン ライセンシングThomson Licensing High resolution 3D projection system
US8272749B2 (en) 2007-04-25 2012-09-25 Thomson Licensing High resolution segmented 3D projection system
US8696135B2 (en) 2007-06-25 2014-04-15 Thomson Licensing Video recording prevention system
CN101878655B (en) * 2007-11-30 2013-02-06 伊斯曼柯达公司 Stereo projection apparatus
KR100924086B1 (en) * 2008-01-29 2009-11-02 (주)캐스트원 Projection System for Three-dimensional Image Photographing
JP2010145431A (en) * 2008-12-16 2010-07-01 Nippon Hoso Kyokai <Nhk> Optical system and projection display device
CN101859052A (en) * 2009-04-01 2010-10-13 精工爱普生株式会社 Projector
US8322859B2 (en) 2009-04-01 2012-12-04 Seiko Epson Corporation Projector
KR101043253B1 (en) 2010-02-18 2011-06-21 재단법인대구경북과학기술원 Three-dimensional image display apparatus
JP2012203294A (en) * 2011-03-28 2012-10-22 Ushio Inc Polarization element unit and polarization light irradiation apparatus
US9279996B2 (en) 2011-04-26 2016-03-08 Zhejiang Estar Display Tech Co., Ltd. 3D projection optical system and dual-chip light splitting and light combining module thereof
CN102591029A (en) * 2011-04-26 2012-07-18 浙江亿思达显示科技有限公司 3D projection optical system and dual chip light splitting and light integrating model thereof
WO2012146043A1 (en) * 2011-04-26 2012-11-01 浙江亿思达显示科技有限公司 3d optical projection system and dual-chip beam splitting and combining module thereof
CN102650741B (en) * 2012-03-16 2014-06-11 京东方科技集团股份有限公司 Light splitting device, manufacturing method thereof and 3D (Three-Dimensional) display device
CN102650741A (en) * 2012-03-16 2012-08-29 京东方科技集团股份有限公司 Light splitting device, manufacturing method thereof and 3D (Three-Dimensional) display device
WO2014064743A1 (en) * 2012-10-22 2014-05-01 Necディスプレイソリューションズ株式会社 Projector
US9529247B2 (en) 2012-10-22 2016-12-27 Nec Display Solutions, Ltd. Projector including polarization separation element and rotating prism
US9584780B2 (en) 2012-12-27 2017-02-28 Nec Display Solutions, Ltd. Projector and controlling method of the same
WO2015073838A1 (en) * 2013-11-15 2015-05-21 Reald Inc. High dynamic range, high contrast projection systems
US9625745B2 (en) 2013-11-15 2017-04-18 Reald Inc. High dynamic range, high contrast projection systems
CN105988268A (en) * 2015-01-27 2016-10-05 深圳市绎立锐光科技开发有限公司 Projection imaging system
CN105988268B (en) * 2015-01-27 2018-04-13 深圳市光峰光电技术有限公司 Projection imaging system
WO2019225052A1 (en) * 2018-05-22 2019-11-28 株式会社Jvcケンウッド Projector and multi-projection system

Similar Documents

Publication Publication Date Title
EP2248346B1 (en) Stereo projection using polarized solid state light sources
US7042535B2 (en) Optical display system and optical shifter
EP2423745B1 (en) Laser illuminated micro-mirror projector
US6603504B1 (en) Multiview three-dimensional image display device
EP1420597B1 (en) Projector
US8233035B2 (en) Dual-view stereoscopic display using linear modulator arrays
US6332684B1 (en) Projection type color image display apparatus
KR101405026B1 (en) High dynamic range projection system
US6594090B2 (en) Laser projection display system
US7185984B2 (en) Illumination optical system and projector comprising the same
US6511184B2 (en) Color image display apparatus
US7474360B2 (en) Optical unit, video display apparatus, and color switching method
US7182463B2 (en) Pixel-shifting projection lens assembly to provide optical interlacing for increased addressability
US6893133B1 (en) Single panel color image projection system
US7046407B2 (en) Diffractive color filter
US7188953B2 (en) Display apparatus using LCD panel
US6568815B2 (en) Picture projection apparatus
US6553168B2 (en) Projection system utilizing fiber optic illumination
KR100850708B1 (en) Image display apparatus comprising optical scanner
JP3953979B2 (en) Illumination optical system using dichroic mirror wheel and image display apparatus having the same
US6508554B2 (en) Projection-type image display apparatus
JP4147698B2 (en) Display optical device
US7429111B2 (en) Two-panel color management system
US6445406B1 (en) Stereoscopic image display apparatus whose observation area is widened
CN101171846B (en) Display apparatus using LCD panel

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20051214

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20071217

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080108

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080222

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080318

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080515

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20080617