JPH1069012A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the adjustment of an optical system for projection which is miniaturized and whose image is not distorted by synthesizing a P-polarization image and an S-polarization image formed by modulating P-polarization light and S- polarization light, based on image information, so that one optical image is formed. SOLUTION: A signal in which one image plane comprises the even numbered frames is used as an image signal, and skip scanning is performed by the P polarization light and the S polarization light obtained when an odd numbered frame signal and an even numbered frame signal are inputted to the two-dimensional liquid crystal arrays 15R, 15G and 15B of space modulators 5 and 6 and modulated. Consequently, when the two-dimensional image signal is inputted to the arrays 15R, 15G and 15B, a two-dimensional image is projected on a screen 10. The ship scanning is performed by the P polarization light and the S polarization light obtained when a stereoscopic image signal having deviation corresponding to the parallax of right and left eyes is inputted to the arrays 15R, 15G, and 15B and modulated, and the image synthesized at the screen 10 is observed by the attachment of a pair of polarization spectacles having polarizing plates in accordance with the right and left polarizing directions, so that a stereoscopic image can be viewed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device, and more particularly to a projector device, in which light emitted from a light source is polarized and separated into two polarized lights, spatially modulated, and then polarization-combined to be projected by one projection optical system. To a projector device.

[0002]

2. Description of the Related Art Conventionally, a projector device for projecting a two-dimensional image or a three-dimensional image such as a television screen or a photograph on a screen or the like has been put to practical use. In such a projector device, various improvements have been attempted in which light emitted from a light source is effectively used to obtain a clear and bright image.

[0003] As a projector device for projecting a two-dimensional image, for example, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 6-160888.

FIG. 8 shows a conventional projector apparatus disclosed in Japanese Patent Application Laid-Open No. 6-160888, in which a light source 1 for reflecting white light based on light emission of a xenon lamp or the like with a reflector and irradiating the white light in a predetermined direction, A collimator lens 3 for converting the light 2 from the light source 1 into parallel light, a polarizing prism 4 for separating the parallelized light 2 into two polarized lights (P-polarized light and S-polarized light) having polarization axes orthogonal to each other, A spatial modulator 5 for performing spatial modulation on P-polarized light according to image information;
Spatial modulator 6 for performing spatial modulation on polarized light according to image information
And a projection optical system 9A for projecting the spatially modulated P-polarized light onto the screen 10, and a projection optical system 9B for projecting the spatially modulated S-polarized light onto the screen 10.

The spatial modulators 5 and 6 include a dichroic mirror 12 for separating red (R) from polarized light, a dichroic mirror 13 for separating green (G), and a dichroic mirror 14 for separating blue (B). Two-dimensional liquid crystal arrays 15R, 15G, and 15 having polarizing plates before and after and modulating polarized light separated into three primary colors according to image information.
B, a reflection mirror 16 for changing the directions of the modulated red polarized light and the blue polarized light, respectively, and a dichroic prism for entering the modulated red polarized light, the green polarized light and the blue polarized light and combining them. Seventeen.

According to the above-described configuration, a predetermined image is projected by projecting and combining the modulated P-polarized light and S-polarized light from the projection optical systems 9A and 9B onto the screen 10, respectively.

On the other hand, as a projector device for projecting a three-dimensional image, there is an optical shutter type projector device that realizes a three-dimensional image by opening and closing an optical shutter attached to glasses in synchronization with the flickering of the projected image. However, this optical shutter type projector device
Since the wiring between the optical shutter and the projector device is required, there is a problem that the device becomes complicated and the observer cannot move freely.

As a solution to this problem, an image having left and right parallax is projected on a screen or the like by using two polarized light beams orthogonal to each other, and the glasses are provided with polarizing plates which are orthogonal to each other with left and right eyes. There is a polarization type projector device that realizes a three-dimensional image by observing.

As such a polarization type projector device, there is one disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 62-170931. This polarization type projector device has a left-eye projection optical system having a liquid crystal display for displaying a left-eye image, and a right-eye projection optical system having a liquid-crystal display for displaying a right-eye image. The polarization axes of the liquid crystal displays are shifted by 90 degrees.
An image with left and right parallax is projected from the two projection optical systems onto a screen, synthesized, and viewed as a stereoscopic image by wearing glasses having polarizing plates corresponding to the polarization directions on the left and right, and observing. You.

[0010]

However, according to the conventional projector device, polarized light beams having polarization axes orthogonal to each other are projected by independent projection optical systems. Since an expensive polarizing plate for separating polarized light is required for each optical system for use, there is a problem that the cost increases.

Further, since the two projection optical systems are arranged at positions deviated from the normal line of the screen, a projected image is necessarily distorted. This effect becomes more pronounced as the distance between the projection optical system and the screen becomes smaller. Furthermore, since the position at which images are combined is uniquely determined by the distance between the two projection optical systems and the projection angle, there is a problem that fine adjustment is required every time the distance to the screen changes. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a projector device which is small, has no image distortion, and can easily adjust a projection optical system.

Another object of the present invention is to provide a projector device capable of projecting a two-dimensional image and a three-dimensional image.

[0013]

In order to achieve the above object, the present invention provides a light source for generating a light beam for projection, a collimator means for converting the light beam into parallel light, and a polarizing beam splitter for separating the parallel light beam from each other. Polarization separation means for forming orthogonal P-polarized light and S-polarized light, and two sets of polarization image generating means for modulating the P-polarized light and the S-polarized light based on image information to form a P-polarized image and an S-polarized image, Provided is a polarized light synthesizing means for synthesizing the P-polarized image and the S-polarized image to form one optical image, and a projector device having a projecting means for projecting the one optical image.

In the above projector apparatus, it is preferable that the polarized light separating means and the polarized light image synthesizing means form a cross Nicol with each other. Alternatively, the polarization splitting unit and the polarization image synthesizing unit may be configured to use one polarizing prism in common. The polarization image generating means includes three dichroic mirrors for color-separating the P-polarized light and the S-polarized light into the three primary colors of RGB, and individually converting the P-polarized light and the S-polarized light separated into the three primary colors according to the corresponding color image information. A configuration including three two-dimensional liquid crystal arrays for modulation, a configuration for modulating P-polarized light and S-polarized light based on the same image information, or one screen is formed based on interlaced scanning of even-numbered image frame signals. A configuration in which two-dimensional image information is input and odd-numbered frames and even-numbered frames are respectively associated with the P-polarized image and the S-polarized image, or an image frame signal for a stereoscopic image that differs by parallax between the left and right eyes is input. A configuration or a configuration for selectively inputting one of image frame signals for two-dimensional image information and stereoscopic image information may be adopted. Further, the polarized image generating means separates the P-polarized light and the S-polarized light into the three primary colors of RGB, and is provided with three dichroic mirrors provided so that the incident angles of the P-polarized light and the S-polarized light are approximately 45 degrees. And P-polarized light and S separated into three primary colors
A configuration including a single-plate two-dimensional liquid crystal array that modulates polarization with corresponding RGB light modulation pixels may be used.
Three dichroic mirrors for separating the polarized light and the s-polarized light into the three primary colors of RGB, and modulating the P-polarized light and the s-polarized light, which are color-separated into the three primary colors, from the substantially perpendicular incident direction and modulating them based on image information; A three-dimensional two-dimensional micro-deflection mirror array that emits the modulated P-polarized image and S-polarized image in the incident direction, and a quarter-wave plate that rotates the polarization plane of the modulated P-polarized image and S-polarized image by 90 degrees. A rotating dichroic mirror for color-separating P-polarized light and S-polarized light into three primary colors of RGB in a time-division manner;
A two-dimensional micro-deflection mirror array for inputting polarized light from a substantially perpendicular incident direction and modulating it based on image information, and outputting a modulated P-polarized image and an S-polarized image in the incident direction in a time-division manner; A configuration including a quarter-wave plate for rotating the polarization planes of the polarization image and the S-polarization image by 90 degrees may be adopted. Further, the projection means may have a configuration having a rear projection type screen.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a projector device according to the present invention will be described with reference to the drawings.

FIG. 1 shows a projector device according to a first embodiment of the present invention. A light source 1 for reflecting white light based on light emission of a xenon lamp or the like with a reflector and irradiating the white light in a predetermined direction, An optical lens 3 for converting the light 2 into parallel rays; a polarizing prism 4 for separating the parallelized light 2 into P-polarized light and S-polarized light having polarization axes orthogonal to each other; A spatial modulator 5 that performs spatial modulation according to an image on the S-polarized light, a polarization prism 7 that performs polarization synthesis of the P-polarized light and the S-polarized light that have been subjected to spatial modulation, and Converts polarized light to right-handed circularly polarized light and S-polarized light to left-handed circularly polarized light 1
A quarter-wave plate 8 and a projection optical system 9 for projecting the P-polarized light and the S-polarized light converted into circularly polarized light on a screen 10.
The polarizing prism 4 and the polarizing prism 7 are arranged so as to form a cross Nicol.

The spatial modulators 5 and 6 respectively include a dichroic mirror 12 for separating red from polarized light, a dichroic mirror 13 for separating green, a dichroic mirror 14 for separating blue, and a polarized light separated into three primary colors. Two-dimensional liquid crystal arrays 15R, 15G that modulate according to image information,
15B, a reflection mirror 16 for changing the directions of the modulated red polarized light and blue polarized light, respectively, and a dichroic prism for entering the modulated red polarized light, green polarized light and blue polarized light and combining them. Seventeen.

In this embodiment, the spatial modulators 5, 6 and 2
As an image signal to be input to the one-dimensional liquid crystal arrays 15R, 15G, and 15B, signals constituting one screen with even-numbered frames are used, and odd-frame signals and even-frame signals are respectively converted into two-dimensional signals of the spatial modulators 5 and 6. Liquid crystal array 15
P-polarized light and S input to R, 15G and 15B and modulated
Perform interlaced scanning with polarized light. At this time, P-polarized light and S
The screens formed by the polarized light are synthesized while being shifted from each other by one line.

Therefore, the two-dimensional liquid crystal arrays 15R, 15R
When a two-dimensional image signal is input to G and 15B, a two-dimensional image is projected on the screen 10. A stereoscopic image signal having a parallax difference between the left and right eyes is input to the two-dimensional liquid crystal arrays 15R, 15G, and 15B, and interlaced scanning is performed with P-polarized light and S-polarized light that have been modulated. A stereoscopic image can be seen by attaching and observing polarized glasses having polarizing plates according to the left and right polarization directions.

According to the above configuration, the polarization-separated P
Since the polarization and S-polarized light are modulated and then combined and projected on the screen 10 by the projection optical system 9, the size of the projector device can be reduced. In addition, since the projection optical system 9 can be arranged on an extension of the normal line of the screen 10, there is no distortion of the image, and the adjustment of the projection optical system can be easily performed.

Since the polarizing prism 4 and the polarizing prism 7 form a cross Nicol, the two-dimensional liquid crystal array 1
Polarizing plates provided before and after 5R, 15G, and 15B are not required, so that the brightness of an image is improved by 1.5 times and the cost of the apparatus can be reduced. Since the number of pixels of each of the two-dimensional liquid crystal arrays 15R, 15G, and 15B is sufficient for each frame and is only half of the total number of pixels of the display screen, the number of the liquid crystal arrays is two for a method using one polarized light. Even if it is doubled, as described above, since an expensive polarizing plate is not used, a substantial increase in cost can be avoided.

FIG. 2 shows a projector device according to a second embodiment of the present invention, which is a spatial modulator 1 for spatially modulating P-polarized light and S-polarized light separated by a polarizing prism 4.
8, 19, and a polarizing prism 7 that combines the spatially modulated P-polarized light and S-polarized light, and the polarizing prism 4 and the polarizing prism 7 are arranged so as to form crossed Nicols.
The spatial modulators 18 and 19 convert P-polarized light and S-polarized light into RGB.
Dichroic prism 20 for separating the light into three primary colors. The other configurations and functions are the same as those of the first embodiment, and the duplicate description will be omitted.

According to the configuration described above, by using the dichroic prism 20, the spatial modulators 18, 1 can be used.
9 can be simplified, and a miniaturized projector device can be formed.

FIG. 3 shows a projector device according to a third embodiment of the present invention. The dichroic mirrors 21R, 21G, and 21B for separating P-polarized light separated by the polarizing prism 4 into three primary colors of RGB; Dichroic mirrors 22R, 22 for separating polarized light into three primary colors of RGB
G, 22B, a two-dimensional lens array 23 for condensing P-polarized light and S-polarized light separated into three primary colors, and a single-plate-shaped lens for spatially modulating the collected P-polarized light and S-polarized light with corresponding RGB pixels. A two-dimensional liquid crystal spatial modulator 24 and a Fresnel lens 25 that converts spatially modulated P-polarized light and S-polarized light into parallel light.
And a polarizing prism 7 for synthesizing the P-polarized light and the S-polarized light that have been made into parallel light, and the polarizing prism 4 and the polarizing prism 7 are arranged so as to form a cross Nicol.

Dichroic mirrors 21R, 21G, 2
1B and 22R, 22G, and 22B are arranged at angles of slightly different angles of incidence and reflection in the three primary colors of RGB, with the incident center angle of P-polarized light and S-polarized light being 45 degrees. The two-dimensional liquid crystal spatial modulator 24 is formed by arranging RGB pixels on the same plane, and modulates P-polarized light and S-polarized light on a frame basis. The other configurations and functions are the same as those of the first embodiment, and the duplicate description will be omitted.

According to the above configuration, dichroic mirrors 21R, 21G, 21B and 22R, 22G,
By setting the incident central angle of 22B to 45 degrees, the mirror required for guiding polarized light can be further reduced,
A small and simplified projector device can be realized at a low price. Also, a stereoscopic image signal can be input instead of a two-dimensional image signal, and a stereoscopic image can be viewed by observing the image synthesized on the screen 10 with polarized glasses.

In the single-plate two-dimensional liquid crystal spatial modulator 24,
Normally, three times the number of pixels is required to modulate the three primary colors of RGB as compared to the three-dimensional liquid crystal array.
In the present embodiment, the image density can be doubled by modulating the P-polarized light and the S-polarized light on a frame basis and combining them, so that the number of pixels is 1.5 times the number of pixels of the three-plate system. Can be configured.

FIG. 4 shows a projector device according to a fourth embodiment of the present invention. The projector device is polarized and separated by the polarizing prism 4 and RGB by the dichroic mirrors 12, 13 and 14.
Two-dimensional reflective liquid crystal spatial modulators 26R, 26G, 26B for modulating P-polarized light and S-polarized light color-separated into three primary colors
And two-dimensional reflective liquid crystal spatial modulators 26R, 26G, 26
B, a photoconductive film 27R, 27G, 27B to which a predetermined voltage is applied, and photoconductive films 27R, 27G,
The CRTs 28R, 28G, and 28B irradiate 27B with write light according to RGB modulation signals. The other configurations and functions are the same as those of the first embodiment, and the duplicate description will be omitted.

Two-dimensional reflective liquid crystal spatial modulators 26R, 26R
When the writing light is irradiated from the CRTs 28R, 28G and 28B, the photoconductive films 27 and 26B are
R, 27G, and 27B are made conductive and a voltage is applied.
The P-polarized light and the S-polarized light are modulated based on this voltage, and the polarization plane is rotated by 90 degrees. The modulated P-polarized light and S-polarized light are combined by the polarizing prism 4 and projected onto the screen 10 from the projection optical system 9 via the quarter-wave plate.

According to the above configuration, the number of polarizing prisms 4 can be reduced to one, so that the utilization efficiency of P-polarized light and S-polarized light can be doubled.

FIG. 5 shows a projector device according to a fifth embodiment of the present invention. The projector device is polarized and separated by the polarizing prism 4 and RGB by the dichroic mirrors 12, 13 and 14.
Two-dimensional micro-deflection mirror arrays 31R, 31G, 31 for modulating P-polarized light and S-polarized light separated into three primary colors
B and two-dimensional micro deflection mirror array 31R, 31
A stopper 32 for absorbing light deflected out of the optical path by the G and 31B, and a two-dimensional micro deflection mirror array 31
１ ／ wavelength plates 29 and 30 for rotating the polarization plane of the reflected light by 90 degrees with respect to the light incident on R, 31G and 31B,
-Dimensional micro deflection mirror arrays 31R, 31G, 31B
Are arranged such that P-polarized light and S-polarized light separated into three primary colors are incident from the normal direction. The other configurations and functions are the same as those of the first embodiment, and the duplicate description will be omitted.

The two-dimensional micro deflection mirror array 31R,
31G and 31B are configured by arranging a plurality of micromirrors in a two-dimensional array, and modulate P-polarized light and S-polarized light by changing the inclination of each mirror based on an input image signal. The light deflected out of the optical path during this modulation is absorbed by the stopper 32, and the modulated light is incident again on the dichroic mirrors 12, 13, and 14, and the quarter-wave plates 29 and 30 rotate the polarization plane by 90 degrees. Then, the light is polarized and synthesized by the polarizing prism 4.

According to the above arrangement, the resolution can be doubled without a substantial decrease in the amount of light as compared with a liquid crystal spatial modulator. Further, by inputting P-polarized light and S-polarized light which are color-separated into three primary colors from the normal direction of the two-dimensional micro deflection mirror arrays 31R, 31G, 31B, image distortion can be prevented.

FIG. 6 shows a projector device according to a sixth embodiment of the present invention.
A rotating plate 33 in which dichroic mirrors for separating the three primary colors are arranged in the circumferential direction; a two-dimensional micro-deflecting mirror array 34 for modulating P-polarized light and S-polarized light separated by the polarizing prism 4; Array 3
4 has a stopper 32 for absorbing light deflected out of the optical path, and quarter-wave plates 29, 30 for rotating the plane of polarization of reflected light by 90 degrees with respect to the light incident on the two-dimensional micro-deflection mirror array 34. . The other configurations and functions are the same as those of the first embodiment, and the duplicate description will be omitted.

The light 2 emitted from the light source 1 is separated into three primary colors of RGB by transmitting through a rotating rotating plate 33, and is separated by a polarizing prism 4 into P-polarized light and S-polarized light. The polarization-separated P-polarized light and S-polarized light are modulated by the two-dimensional micro-deflection mirror array 34,
The optical path is reversed and the polarization plane is set to 9 by the quarter-wave plates 29 and 30.
After being rotated by 0 degrees, the light is polarized and synthesized by the polarizing prism 4.

According to the above configuration, each of the P-polarized light and the S-polarized light can be modulated by one two-dimensional micro-deflection mirror array, so that the configuration can be simplified.

FIG. 7 shows a rear projection type projector device according to a seventh embodiment of the present invention. Inside the housing 35, the light source described in the above embodiment and the light emitted from the light source are provided. Is polarized and separated into P-polarized light and S-polarized light and modulated, and an image synthesizing unit 36 including an image modulating unit and the like that polarization-modulates the modulated P-polarized light and S-polarized light, and an image synthesized by the image synthesizing unit 36 It comprises a projection optical system 38 for projecting via the reflection mirror 37 and a reflection mirror 39 provided on the back of the screen 40.

According to the above configuration, since an image is projected from one projection optical system, the reflection mirrors 37 and 3
Even when an image is projected from the back side of the screen via the image 9, a bright rear projection type projector device can be provided without causing image distortion.

[0039]

As described above, according to the projector of the present invention, the P-polarized light and the S-polarized light separated by the polarization separating means are spatially modulated based on the image information by the spatial modulator and combined by the polarization combining means. The projection optical system is projected onto the screen from one projection optical system. Therefore, the projection optical system can be easily adjusted with a small size and no image distortion. By switching, a two-dimensional image and a three-dimensional image can be projected.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a projector device according to a first embodiment.

FIG. 2 is an explanatory diagram illustrating a projector device according to a second embodiment.

FIG. 3 is an explanatory diagram showing a projector device according to a third embodiment.

FIG. 4 is a plan view showing a projector device according to a fourth embodiment.

FIG. 5 is a plan view showing a projector device according to a fifth embodiment.

FIG. 6 is a plan view showing a projector device according to a sixth embodiment.

FIG. 7 is a plan view showing a rear projection type projector device according to a seventh embodiment.

FIG. 8 is an explanatory diagram showing a conventional projector device.

[Description of Signs] 1, light source 2, light 3, collimator lens 4, polarizing prism 5, spatial modulator 6, spatial modulator 7, polarizing prism 8, quarter-wave plate 89, projection optical system 9A, projection Optical system 9B, projection optical system 10, screen 11, reflection mirror 12, dichroic mirror 13, dichroic mirror 14, dichroic mirror 15R, 15G, 15B, two-dimensional liquid crystal array 16, reflection mirror 17, dichroic prism 18, spatial modulation Device 19, spatial modulator 20, dichroic prism 21R, 21G, 21B, dichroic mirror 22R, 22G, 22B, dichroic mirror 23, two-dimensional lens array 24, two-dimensional spatial modulator 25, Fresnel lens 26R, 26G, 26B, 2 -Dimensional reflective liquid crystal spatial modulator 27R, 2 G, 27B, photoconductive films 28R, 28G, 28B, CRT 29, 波長 wavelength plate 30, ４ wavelength plate 31R, 31G, 31B, two-dimensional micro deflection mirror array 32, stopper 33, rotating plate 34, 2 -Dimensional micro deflecting mirror array 35, housing 36, image synthesizing unit 37, reflecting mirror 38, projection optical system 39, reflecting mirror 40, screen

Claims (12)

[Claims] A light source for generating a light beam for projection; a collimator for collimating the light; a polarization separating device for polarization-separating the parallel light to form P-polarized light and S-polarized light orthogonal to each other; Two sets of polarization image generating means for modulating the P-polarized light and the S-polarized light based on image information to form a P-polarized image and an S-polarized image; A projector device comprising: a polarization image synthesizing unit that forms an optical image; and a projecting unit that projects the one optical image. 2. The projector device according to claim 1, wherein said polarized light separating means and said polarized image synthesizing means form a crossed Nicols with each other. 3. The projector device according to claim 1, wherein said polarization separation means and said polarization image synthesizing means share one polarizing prism. 4. The polarization image generating means corresponds to three dichroic mirrors for color-separating the P-polarized light and the S-polarized light into three primary colors of RGB, and corresponds to the P-polarized light and the S-polarized light color-separated into three primary colors. 2. The projector device according to claim 1, wherein said projector device includes three two-dimensional liquid crystal arrays that individually modulate according to image information of a color to be reproduced. 5. The projector according to claim 1, wherein said polarization image generating means modulates said P-polarized light and said S-polarized light based on the same image information. 6. The polarized image generating means inputs two-dimensional image information for forming one screen based on interlaced scanning of even-numbered image frame signals, and divides the odd-numbered frame and the even-numbered frame into the P-polarized image and the P-polarized image. 2. The projector according to claim 1, wherein the projector is configured to correspond to each of the S-polarized images. 7. The projector device according to claim 1, wherein said polarization image generating means is configured to input an image frame signal for a stereoscopic image that differs by parallax between left and right eyes. 8. The projector device according to claim 1, wherein said polarization image generating means is configured to selectively input one of the image frame signal for the two-dimensional image information and the image frame signal for the three-dimensional image information. 9. The polarization image generating means color-separates the P-polarized light and the S-polarized light into three primary colors of R, G, and B, and approaches so that the incident angles of the P-polarized light and the S-polarized light become approximately 45 degrees. And a single-plate two-dimensional liquid crystal array that modulates the P-polarized light and the S-polarized light separated into three primary colors by corresponding RGB light modulation pixels. 2. The projector device according to claim 1. 10. The polarization image generating means includes: three dichroic mirrors for separating the P-polarized light and the S-polarized light into three primary colors of RGB; and substantially converting the P-polarized light and the S-polarized light separated to the three primary colors. Three sets of two-dimensional micro deflecting mirror arrays that enter from a perpendicular incident direction, modulate based on image information, and emit the modulated P-polarized image and the S-polarized image in the incident direction; The projector device according to claim 1, further comprising a quarter-wave plate that rotates the polarization planes of the P-polarized image and the S-polarized image by 90 degrees. 11. A rotating dichroic mirror for color-separating the P-polarized light and the S-polarized light into three primary colors of RGB in a time-division manner, and the P-color color-separated into three primary colors in a time-division manner. Polarization and the S
A two-dimensional micro-deflection mirror array that receives polarized light from a substantially perpendicular incident direction, modulates the polarized light based on image information, and emits the modulated P-polarized image and the S-polarized image in the incident direction in a time-division manner; 2. The projector according to claim 1, further comprising a quarter-wave plate for rotating the planes of polarization of the P-polarized image and the S-polarized image by 90 degrees. 12. The projector according to claim 1, wherein said projection means has a rear projection screen.