JPH07318884A - Stereoscopic video display device - Google Patents

Abstract

PURPOSE:To provide a stereoscopic video display device without a flicker and with excellent color tone with simple constitution. CONSTITUTION:A light beam from a light source 1 of which only the light beam having a polarization angle -45 deg. transmits through first polarizing plates 72R, 72G, 72B, and the transmitting beam is light modulated by liquid crystal panels 71G, 71G, 71B, and the polarization angle is converted to +45 deg.. Then, the beam transmitting through the liquid crystal panels 71R, 71G, 71B is made incident on second polarizing plates 73R, 73G, 73B having the polarization angle +45 deg.. The second polarizing plates 73R, 73G, 73B transmit only the beam having polarization angle of +45 deg., and the beam having polarization angle of +45 deg. whose polarization angle is changed to +45 deg. and -45 deg. at every pixel adjacent in the horizontal direction of the liquid crystal panels 71R, 71G, 71B by phase difference plates 8R, 8G, 8B. Thus, the polarization angle of a light emission beam from the phase difference plates 8R, 8G, 8B becomes +90 deg. and 0 deg. alternately at every pixel of the liquid crystal panels 71R, 71G 71B in the horizontal direction, and a viewer enjoys a stereoscopic video by using polarization glasses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display device using polarized glasses.

[0002]

2. Description of the Related Art A stereoscopic image display system using polarized glasses is roughly classified into a polarization system and a time division system. In the polarization method, two systems of input video signals having parallax information corresponding to the left and right eyes of the viewer are superimposed on two systems of video display devices in which polarizing plates having different transmission axes by 90 degrees are arranged on the front surface. It is a method of displaying and separating stereoscopic images with polarizing glasses having corresponding transmission axes.

FIG. 10 and FIG. 11 show an example of a conventional stereoscopic image display device using a polarization method.

In this example, the image signal for the left eye is projected on the screen 15 by the projector 101 for the left eye in which the first polarizing plate 103 having a transmission angle of +45 degrees is arranged. Also,
The right-eye image signal is projected on the screen 14 by the right-eye projector 102 in which the second polarizing plate 104 having the transmission axis different from the first polarizing plate 103 by 90 degrees (-45 degrees) is arranged. Then, the viewer wears the polarized glasses 15 corresponding to each of the left and right eyes, separates the left and right images, and views the stereoscopic image.

However, this system requires an adjusting mechanism for aligning the two projectors and the left and right images in order to accurately superimpose the left and right images, and the system is complicated and adjustment for overlapping the left and right images is required. Therefore, only a specialist can install it.

By the way, a liquid crystal projector which is a display device generally uses a plurality of liquid crystal panels having input and output polarization angles of ± 45 degrees and a plurality of dichroic mirrors. The dichroic mirror causes the linearly polarized light to be disturbed, causing crosstalk in the left and right images. (Hereinafter, the azimuth angle of linearly polarized light is 0 degree with reference to the horizontal direction of the liquid crystal panel.)
Each dichroic mirror has the spectral characteristics shown in FIG.

As shown in FIG. 11, the azimuth angle (hereinafter referred to as the polarization angle) of the linearly polarized light of the left image is +45 degrees with respect to the horizontal, and the polarization angle of the right image is horizontal. On the other hand, when a second polarizing plate having an angle of −45 degrees is used, unnecessary light is removed by the first and second polarizing plates, and crosstalk can be prevented, but light is prevented by the first and second polarizing plates. A part of the screen is cut off, and the brightness of the screen is reduced.

Therefore, the present applicant has filed Japanese Patent Application No. 5-1980.
No. 47, the polarization angle is set to 9 for each pixel of the liquid crystal panel.
It is proposed to use an optical polarization means that is different by 0 degrees.

However, in the above structure, a liquid crystal panel forming the optical polarization means is separately required,
The pixel alignment between the liquid crystal panel that is optically modulated according to the image signal and the liquid crystal panel that constitutes the optical polarization means becomes difficult, and the light from the light source passes through the two liquid crystal panels and reaches the screen. Will be reduced.

Further, a liquid crystal panel constituting the optical polarization means, a drive circuit for changing the polarization angle for each pixel of the liquid crystal panel, etc. are required, and the apparatus becomes complicated and large.

Further, in the above-described stereoscopic image display device, since the polarization angle is changed for each pixel of the liquid crystal panel, the dichroic mirror of the liquid crystal projector is P-polarized (vertical direction).
Light in which S and S linearly polarized light (horizontal direction) are mixed is incident.

Therefore, as shown in FIG. 9, the dichroic mirror has a problem that the spectral characteristic changes due to the difference between the P-polarized light and the S-polarized light, and the hues of the left and right images differ depending on the optical system.

FIG. 9 is a diagram showing the polarization dependence of the spectral characteristics of a green light separating dichroic mirror as an example.

Hereinafter, the cause of different color shades will be described with reference to FIG.

In FIG. 9, when natural light is incident on the green light separating dichroic mirror, it is 500 nm to 600 nm.
While the light having a wavelength of nm is reflected, when the P-polarized light is incident, the light having a wavelength of 515 nm to 585 nm is reflected,
The reflection band becomes narrow.

When S-polarized light is incident, 485n
Reflects light with a wavelength of m to 615 nm and widens the reflection band.

As a result, since the reflection band at the green light dichroic mirror differs depending on the incident light, the wavelength band of the light incident on each adjacent pixel of the liquid crystal panel is different, resulting in a difference in hue.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to obtain a stereoscopic image display device having a simple structure, no flicker, and a good color tone.

[0019]

According to the present invention, a liquid crystal is provided which has a light source and polarizing plates on the entrance side and the exit side, and combines and displays two systems of input video signals having parallax information corresponding to each of the left and right eyes. Panel, a phase difference plate for changing the polarization angle of light passing through adjacent horizontal pixels of the liquid crystal panel by 90 degrees corresponding to the images of the left and right eyes, and the light passing through the phase difference plate enlarged on the screen It is a stereoscopic image display device characterized by comprising a projection lens for projecting.

[0020]

According to the present invention, the light from the light source 1 having the polarization angle of -45 degrees is transmitted through the incident side polarization plates 9R, 9G and 9B. The light is modulated by the liquid crystal panels 10R, 10G, and 10B, and the polarization angle is converted to +45 degrees. The light that has passed through the liquid crystal panels 10R, 10G, and 10B has a polarization angle of +45.
The light is incident on the exit side polarization plates 11R, 11G and 11B. The emission side polarization plates 11R, 11G, and 11B transmit only light having a polarization angle of +45 degrees, and the light having a polarization angle of + 45 ° is adjacent to the liquid crystal panels 10R, 10G, and 10B by the phase difference plates 12R, 12G, and 12B. The polarization angle is changed to +45 degrees and −45 degrees for each pixel in the horizontal direction.

As a result, the phase difference plates 12R, 12G, 12
The polarization angles of the light emitted from B are the liquid crystal panels 10R and 10R.
The horizontal pixels of G and 10B are alternately set to +90 degrees and 0 degrees, and the viewer can view stereoscopic images using polarizing glasses.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the stereoscopic image display device of the present invention will be described below with reference to the drawings.

FIG. 1 is an optical block diagram of a stereoscopic image display device of the present invention, FIG. 2 is a diagram showing polarization angles of left and right images on a screen, FIG. 3 is a perspective view of essential parts of FIG. 1, and FIG. 4 is a liquid crystal. It is a drive circuit diagram of a panel.

In FIG. 1, the light source 1 has a lamp that emits white light, such as a metal halide lamp. And
White light is emitted from the light source 1, the white light is collimated, the infrared rays and the ultraviolet rays are removed by the ultraviolet / infrared ray removing filter 2, and the white light is incident on the green light separating dichroic mirror 3.

As shown in FIG. 7, the green light separating dichroic mirror 3 has a narrower reflection band than that of the conventional one in consideration of the difference between the spectral characteristics of natural light and the spectral characteristics of P-polarized light (5
It is designed to reflect light with a wavelength of 15 nm to 585 nm. In this green light separation dichroic mirror 3, the reflected green light is transmitted through the total reflection mirror 4 and the green light condenser lens 6G to the green light liquid crystal display unit 7G. To the red light separation dichroic mirror 5 while being optically modulated according to the video signal.

Here, the green light liquid crystal display portion 7G includes a green light liquid crystal panel 71G and first and second green light polarizing plates 72G and 73 arranged at the input and output of the green light liquid crystal panel 71G.
G and G, the polarization angles of the first and second green light polarization plates 72G and 73G are aligned with the orientation of the green light liquid crystal panel 71G, and the first green light polarization plate 72G is-
45 degrees, and the second green light polarization plate 73G is +45 degrees.

Further, on the output side of the second green light polarizing plate 73G, a half-wave plate (hereinafter referred to as a retardation plate) 8G is arranged, and this retardation plate is provided on the green light liquid crystal panel 71G. The first phase plate 81G corresponds to odd-numbered column pixels and has a polarization angle of −45 degrees, and the second phase plate 82G corresponds to even-numbered column pixels and has a polarization angle of +45 degrees.

Therefore, the green light emitted from the odd-numbered pixels of the green light liquid crystal panel 71G has its phase converted by +45 degrees by the first phase plate 81G to become P-polarized light.
The phase of the green light emitted from the even-numbered columns of pixels of the green light liquid crystal panel 71G is converted by the second phase plate 82G by −45 degrees to become S-polarized light.

On the other hand, the red light separation dichroic mirror 5
As shown in FIG. 7, in consideration of the difference between the spectral characteristic of natural light and the spectral characteristic of S-polarized light, the reflection band is designed to be on the long wavelength side (reflects light having a wavelength of 615 nm or more) from the conventional one. The red light separating dichroic mirror 5 reflects the red light, and the reflected red light enters the red light liquid crystal display portion 7R via the red light condenser lens 6R,
The light is modulated in accordance with the video signal, and the remaining light passes through the red light separation dichroic mirror 5.

Here, the red light liquid crystal display section 7R includes a red light liquid crystal panel 71R and first and second red light polarizing plates 72R and 73 arranged at the input and output of the red light liquid crystal panel 71R.
R, and the polarization angles of the first and second red light polarization plates 72R and 73R are aligned with the orientation of the red light liquid crystal panel 71R, and the first red light polarization plate 72R is-
45 degrees, and the second red light polarization plate 73R is +45 degrees.

Further, a phase difference plate 8R is arranged on the output side of the second red light polarizing plate 73R, and this phase difference plate corresponds to the odd-numbered columns of pixels of the red light liquid crystal panel 71R and has a polarization angle of −.
The first phase plate 81R has a phase of 45 degrees, and the second phase plate 82R has a polarization angle of +45 degrees and corresponds to pixels in even-numbered columns.

Therefore, the red light emitted from the odd-numbered pixels of the red light liquid crystal panel 71R is converted by the first phase plate 81R by +45 degrees in phase to become P-polarized light.
The phase of the red light emitted from the even-row pixels of the red light liquid crystal panel 71R is converted by the second phase plate 82R by −45 degrees and becomes S-polarized light.

Further, the light transmitted through the red light dichroic mirror 5 is transmitted through the blue light filter 9,
The blue light is extracted, and the blue light is incident on the blue light liquid crystal display portion 7B via the blue light condenser lens 6B and is optically modulated according to the video signal.

Here, the blue light liquid crystal display section 7B includes a blue light liquid crystal panel 71B, and first and second blue light polarization plates 72B and 73 arranged at the input and output of the blue light liquid crystal panel 71B.
B, and the polarization angles of the first and second blue light polarization plates 72B and 73B are aligned with the orientation of the blue light liquid crystal panel 71B, and the first blue light polarization plate 72B is −
45 degrees, and the second blue light polarizing plate 73B is +45 degrees.

Further, a retardation plate 8B is arranged on the output side of the second blue light polarization plate 73B, and this retardation plate corresponds to the odd-numbered pixels of the blue light liquid crystal panel 71B and has a polarization angle of −.
The first phase plate 81B having a phase of 45 degrees and the second phase plate 82B having a polarization angle of +45 degrees corresponding to the even-row pixels are included.

Therefore, the blue light emitted from the odd-numbered pixels of the blue light liquid crystal panel 71B has its phase converted by +45 degrees by the first phase plate 81B to become P-polarized light.
The blue light emitted from the even-numbered pixels of the blue light liquid crystal panel 71B has its phase converted by −45 degrees by the second phase plate 82B to become S-polarized light.

Next, the green light and the red light whose phases have been converted by the green light phase difference plate 8G and the red light phase difference plate 8R are combined by the green light combining dichroic mirror 10 having the spectral characteristics shown in FIG. Then, the light is incident on the blue light combining dichroic mirror 11, and the blue light phase difference plate 8
The blue light whose phase has been converted by B is the total reflection mirror 12
It is incident on the blue light combining dichroic mirror 11 via.

By the way, as shown in FIG. 7, the blue light filter 9 has a reflection band on the short wavelength side (48%) in consideration of the difference between the spectral characteristic in natural light and the spectral characteristic in S-polarized light.
It is designed to reflect light with a wavelength of 5 nm or less), and the blue light combining dichroic mirror 11 combines the above-mentioned lights, and the combined light is enlarged and projected on the screen 14 via the projection lens 13.

The difference in spectral characteristics between the natural light of the dichroic mirror and the S-polarized light and the P-polarized light is set to 15 nm, but similar effects can be obtained if the difference is about 10 to 20 nm.

As a result, as shown in FIG. 2, the viewer views stereoscopic images using the polarized glasses 15 having a lens that transmits P-polarized light to the left eye and a lens that transmits S-polarized light to the right eye. You can

Next, the phase conversion operation by the phase difference plate will be described in detail with reference to FIG.

FIG. 3 is a diagram showing the liquid crystal display section 7 and the retardation plate 8 in FIG.

The first polarizing plate 72 transmits only the linearly polarized light having a polarization angle of -45 degrees necessary for the liquid crystal panel 71 from the natural light of the light source, is optically modulated by the liquid crystal panel 71, and its phase is 9
It is twisted 0 degrees. Then, the light passing through the liquid crystal panel 71 is polarized by +45 degrees by the second polarizing plate 73 having a polarization angle of +45 degrees.
Only linearly polarized light having a polarization angle of 45 degrees is transmitted, and the phase of the light having a polarization angle of 45 degrees is converted by +45 degrees for each odd-row pixel of the liquid crystal panel 71 by the first phase plate 81 constituting the phase difference plate 8. The second which is P-polarized and constitutes the retardation plate 8
The phase plate 82 converts the phase of light by −45 degrees for each even-numbered pixel of the liquid crystal panel 71 to convert it into S-polarized light.

Here, the phase difference plate 8 alternately includes a first phase plate 81 for converting incident light having a polarization angle of +45 degrees to +45 degrees and a second phase plate 82 for converting incident light to -45 degrees. Although the bonding is performed according to the pixel pitch of the liquid crystal panel 71 in the horizontal direction, the effect of the seam can be eliminated by matching this seam with the black matrix portion of the liquid crystal panel 71.

Further, when the phase difference plate 8 is attached independently, a position adjustment adjusting mechanism for the pixels of the liquid crystal panel 71 and the phase difference plate 8 is required separately.
The position adjusting mechanism is unnecessary by integrally attaching the polarizing plate 73 and the retardation plate 8 to the pixel.

By the way, as shown in FIG. 4, the liquid crystal panel 71 has a first source driver 71 connected to pixels in odd-numbered columns.
1 and a second source driver 71 connected to the even-column pixels
The first source driver 711 receives the left-eye video signal, and the second source driver 712 receives the right-eye video signal.

The left-eye video signal is supplied to the liquid crystal panel 7
Since the odd-numbered 1 pixel is driven and the right-eye video signal drives the even-numbered pixel of the liquid crystal panel 71, the liquid crystal panel 7 is driven.
The light modulation of 1 is controlled by the left-eye video signal for the odd-numbered pixels and the right-eye video signal for the even-numbered pixels of the liquid crystal panel 71.

As a result, the light optically modulated by the left-eye image signal (the light transmitted through the pixels in the odd-numbered columns) is converted by the retardation plate 8 into the light having the polarization angle of +90 degrees (P-polarized light) and the projection lens. Project from 13. Similarly, the light optically modulated by the image signal for the right eye (the light transmitted through the even-numbered pixels) is converted into the light having the polarization angle of 0 degree (S-polarized light) by the phase difference plate 8 and projected from the projection lens 13. To do.

Then, the viewer can enjoy a stereoscopic image by viewing the above-mentioned P-polarized light and S-polarized light using the polarized glasses 15.

Next, FIG. 5 shows a second embodiment using a different retardation plate 8.

The difference between FIG. 5 and FIG. 3 is that the retardation plate corresponds to the odd-row pixels of the liquid crystal panel 71, the first phase plate 81 for phase-polarizing the polarization angle by −45 degrees, and the even-row pixels. The second phase plate 82 has a polarization angle of +45 degrees.

The phase of the light emitted from the odd-numbered pixels of the liquid crystal panel 71 is +45 by the first phase plate 81.
The light emitted from the pixels in the even-numbered rows of the liquid crystal panel 71 is converted into P-polarized light, and the phase thereof is converted into −45 ° by the second phase plate 82 to become S-polarized light.

In the case of the second embodiment, the first and second source drivers 711 and 712 which compose the liquid crystal panel 71.
When the first row of the liquid crystal panel 71 is selected, the left-eye video signal (or right-eye video signal) is input, and when the second row is selected, the right-eye video signal (or left-eye video signal). Is input, and the video signal input in the horizontal cycle thereafter is switched.

Next, FIG. 6 shows a third embodiment using a different phase difference plate 8.

The difference between FIG. 6 and FIG. 3 is that the first phase plate 8
This is the point where the first and second phase plates 82 are arranged in a mosaic pattern.

In the case of the third embodiment, the first and second source drivers 711 and 712 which compose the liquid crystal panel 71.
When the first row of the liquid crystal panel 71 is selected, the left-eye video signal and the right-eye video signal are alternately input, and when the second row is selected, the right-eye video signal is opposite to the first row. The signal and the video signal for the left eye are alternately input, and thereafter, the video signal input in the horizontal cycle is switched.

In this embodiment, the liquid crystal panel 71 having an orientation of −45 degrees on the incident side and +45 degrees on the emission side, the first polarizing plate 72 having a polarization angle of −45 degrees, and the polarization angle of +.
Although the case where the second polarizing plate 73 having an angle of 45 degrees is used has been described, when the liquid crystal panel 71 having the orientation of +45 degrees on the incident side and the orientation of −45 degrees on the emitting side is used, the polarization angle is +.
While using the first polarizing plate 72 having a polarization angle of 45 degrees and the second polarizing plate 73 having a polarization angle of -45 degrees, the polarization angle is -45.
The first phase plate 81 having a degree of polarization and the second phase plate 81 having a polarization angle of +45 degrees
The same operation can be obtained by using the phase difference plate 8 including the phase plate 82.

Also, when the liquid crystal panel 71 having the orientation of 0 degree on the incident side and the orientation of 90 degree on the emitting side is used, the first polarizing plate 72 having the polarization angle of 0 degree and the polarization angle of 90 degree. The same by using a certain second polarizing plate 73 and a phase difference plate 8 including a first phase plate 81 (transparent plate) having a polarization angle of 0 degree and a second phase plate 82 having a polarization angle of 90 degrees. It is possible to obtain various actions.

Further, there are a system for processing two left and right system video signals supplied to each liquid crystal panel by two independent system video signal processing circuits and a system for performing time division processing by one system signal processing circuit. The time-division signal processing method can be implemented by switching the input video signals of two systems in synchronization with the shift clock of the liquid crystal panel and processing them by the signal processing circuit of one system.

[0060]

According to the present invention, the configuration as described above eliminates the need for the mutual alignment of the projectors, which is a problem in a stereoscopic image display device using two liquid crystal projectors. A stereoscopic image display device can be easily installed.

Further, in the present invention, since the optical polarization means is constituted by the retardation plate, the polarization liquid crystal panel which has been conventionally required is not necessary and the luminous flux reaching the screen is not reduced.

Further, according to the present invention, since the liquid crystal panel for polarization is not required, the driving circuit and the like associated therewith are also unnecessary, and the device is not only small in size but also a normal two-dimensional image display device other than the stereoscopic image display device. Can also be used as

Further, in the present invention, the spectral characteristic of the color synthesizing means is deviated from the spectral characteristic of the color separating means by the difference between the spectral characteristic of the P-polarized component light and the spectral characteristic of the S-polarized component light from the polarizing means. Since they are located at different positions, the hues of the left and right images do not differ due to the difference between the polarized light and the S polarized light.

[Brief description of drawings]

FIG. 1 is an overall block diagram of a stereoscopic image display device of the present invention.

FIG. 2 is a diagram showing a display state on a screen in the stereoscopic image display device of the present invention.

3 is a diagram showing a liquid crystal display unit 7 and a retardation plate 8 in FIG.

FIG. 4 is a block diagram of a liquid crystal panel used in the stereoscopic image display device of the present invention.

FIG. 5 is a diagram showing a second embodiment of the present invention.

FIG. 6 is a diagram showing a third embodiment of the present invention.

FIG. 7 is a diagram showing spectral characteristics of a dichroic mirror used in the stereoscopic image display device of the present invention.

FIG. 8 is a diagram showing spectral characteristics of a dichroic mirror used in a conventional stereoscopic image display device.

FIG. 9 is a diagram showing polarization dependence of spectral characteristics by a green light separation dichroic mirror.

FIG. 10 is a diagram showing a conventional stereoscopic image display device.

FIG. 11 is a diagram showing a display state on a screen in a conventional stereoscopic image display device.

[Explanation of symbols]

 1 Light Source 71R Red Light Liquid Crystal Panel 71G Green Light Liquid Crystal Panel 71B Blue Light Liquid Crystal Panel 72R First Red Light Polarizing Plate 72G First Green Light Polarizing Plate 72B First Blue Light Polarizing Plate 73R Second Red Light Polarizing Plate 73G Second Green Light Polarizing plate 73B Second blue light polarizing plate 8R Red light phase difference plate 8G Green light phase difference plate 8B Blue light phase difference plate 15 Stereoscopic glasses

Claims (5)

[Claims] 1. A liquid crystal panel, in which a light source, polarizing plates are arranged on the incident side and the emitting side, and two input video signals having parallax information corresponding to each of the left and right eyes are combined and displayed, and the liquid crystal panel is adjacent to the liquid crystal panel. And a projection lens that expands and projects the light that has passed through the phase difference plate on the screen by changing the polarization angle of the light that has passed through the horizontal pixels by 90 degrees corresponding to the images of the left and right eyes. A stereoscopic image display device characterized in that 2. A light source, a liquid crystal panel in which polarizing plates are arranged on the incident side and the emission side, and which synthesizes and displays two systems of input video signals having parallax information corresponding to each of the left and right eyes, and an adjacent liquid crystal panel. A first retardation plate that makes the polarization angle of the light passing through the horizontal pixels different from the light passing through the output side polarization plate by +45 degrees, and the light passing through the adjacent horizontal pixels of the liquid crystal panel. Second retardation plate that makes the polarization angle of the light beam different by -45 degrees with respect to the light that has passed through the output side polarization plate, and projection that enlarges and projects the light that has passed through the first and second retardation plates on the screen. A stereoscopic image display device comprising a lens. 3. A liquid crystal panel, in which a light source, polarizing plates are arranged on the incident side and the outgoing side, and two input video signals having parallax information corresponding to each of the left and right eyes are combined and displayed, and the liquid crystal panel is adjacent to the liquid crystal panel. And a projection lens that magnifies and projects the light that has passed through the phase difference plate on the screen. The phase difference plate changes the polarization angle of the light that has passed through the vertical pixels by 90 degrees corresponding to the images of the left and right eyes. A stereoscopic image display device characterized in that 4. A liquid crystal panel, in which a light source, polarizing plates are provided on the incident side and the emitting side, and two input video signals having parallax information corresponding to each of the left and right eyes are combined and displayed, and the liquid crystal panel is adjacent to the liquid crystal panel. A first retardation plate that makes the polarization angle of light passing through a vertical pixel different from the light passing through the output side polarizing plate by +45 degrees, and light passing through an adjacent horizontal pixel of the liquid crystal panel. Second retardation plate that makes the polarization angle of the light beam different by -45 degrees with respect to the light that has passed through the output side polarization plate, and projection that enlarges and projects the light that has passed through the first and second retardation plates on the screen. A stereoscopic image display device comprising a lens. 5. A light source, a first color separation unit that reflects green light from white light from the light source, a green light liquid crystal panel that optically modulates the green light separated by the first color separation unit, and A second color separation means for reflecting red light from the light transmitted through the first color separation means, a red light liquid crystal panel for optically modulating the red light from the second color separation means, and a second color reflection means. A blue light liquid crystal panel that optically modulates the blue light, and the green light, the red light, and the polarization angle of the light that has passed through the blue light liquid crystal panel, the adjacent pixels of the green light, the red light, and the blue light liquid crystal panel. A first color synthesizing means for synthesizing the P-polarized component and the S-polarized component into polarized light, and the green light optically modulated by the green light liquid crystal panel and the red light optically modulated by the red light liquid crystal panel. And the light combined by the first color combining means And a second color synthesizing unit for synthesizing the blue light optically modulated by the blue light liquid crystal panel,
And a projection lens for projecting the light combined by the color combining means. The spectral characteristics of the first and second color combining means are the same as the spectral characteristics of the first and second color separating means. A stereoscopic image display device, which is deviated by a difference between a spectral characteristic of P-polarized component light from a polarizing unit and a spectral characteristic of S-polarized component light.