JPH11142791A - Polariziong device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the polarizing device and projection type display device which obtain high-luminance polarization lighting. SOLUTION: A light source part 1, a 1st lens plate 2 which splits the source light emitted by the light source part 1 into pieces of luminous flux determined by the apertures of lenses 2a, a 2nd lens plate 3 which has lenses 3a where the lenses 2a constitute bright points respectively, a prism lens array 4 which receives incident light emitted from the bright points of the lenses 3a and consists of PBS(polarization beam splitter) 5 and a reflecting prism 6, and a 1/2-wavelength plate 7 which is arranged on the projection surface of the prism array 4 and converts the P or S polarized light exiting from the prism array 4 into the other polarized light are provided; and light which exits from a bright point on a lens 3a to impinge on the PBS 5 adjacent to the reflecting prism 6 and is reflected by the polarized light separation part 5a of the PBS 5 is made incident on the reflecting prism 6 and reflected by the total reflecting mirror 6a of the reflecting prism 6 to exit, and the 1/2-wavelength plate 7 is different in arrangement style between the area corresponding to the nearly center part of the 2nd lens plate 3 and the area other than the center part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing device used for a polarized light illuminating device of a liquid crystal light valve used in a projection type display device, and a light valve illuminated by the polarized light illuminating device using the polarized light device. The present invention relates to a projection display device that projects emitted modulated light as an image on a screen.

[0002]

2. Description of the Related Art Hitherto, as a method for uniformly illuminating a rectangular illumination area such as a liquid crystal light valve, an illumination apparatus using a so-called fly-eye integrator using two lens plates has been known.

In order to further improve the illumination efficiency of this illumination device, a polarizing beam splitter array and a half-wave plate are arranged at predetermined positions on a second exit surface of the two lens plates. There has been proposed a polarization illuminating device aiming at utilization efficiency of light from a light source and a projection type display device using the illuminating device (JP-A-8-30473).
No. 9).

FIG. 16 shows FIG. 8 in the above publication which is used as a description of a polarizing device and a projection type display device described as a modification of the fifth embodiment of the above publication.

[0005] In the conventional example shown in FIG.
00 and a parabolic reflector 1 that is a concave mirror such as a parabolic mirror
01 constitutes a light source unit 102.
The substantially parallel luminous flux emitted from the lens enters a first lens plate 104 on which a plurality of lenses 103 are arranged in a plane. Then, the light emitted from the first lens plate 104 is
The light enters the plurality of lenses 106 of the lens plate 105. In this case, since each lens 106 of the second lens plate 105 is formed corresponding to the shape of each lens 103 of the first lens plate 104 and is arranged at the focal position of these lenses 103, Light from each lens 103 of the first lens plate 104 is focused on the lens 106 of the second lens plate 105.

A plurality of polarizing beam splitters (hereinafter referred to as “PBS”) are provided on the exit surface side of the second lens plate 105.
That. ) 107 is disposed, and a polarizing beam splitter array (hereinafter, referred to as a “PBS array”) 108 is disposed.
On the emission surface of the PBS array 108, a half-wave plate 109 is arranged every other PBS 107. Further, a condenser lens 110 is arranged on the exit surface side of the half-wave plate 109.

According to the drawing, the substantially parallel light beam incident on the lens 103 of the first lens plate 104 is condensed on the substantially central portion of the lens 106 of the second lens plate 105 as described above, and exits the lens 106. , P constituting the PBS array 108
The P-polarized light that enters the BS 107, passes through the polarization separation unit 107a disposed obliquely of the PBS 107, and exits as it is, is reflected by the polarization separation unit 107a of the PBS 107, and enters the adjacent PBS 107.
It is polarized and separated into polarized light. The S-polarized light that has entered the adjacent PBS 107 is polarized by the polarization separation unit 1 of the PBS 107.
07a, and is emitted in the same direction as the optical axis incident on the lens 106.

A half-wave plate 109 is disposed on the exit surface of the PBS 107 and the P-polarized light exit surface. P-polarized light incident on the half-wave plate 109 is converted into S-polarized light. As a result, all the incident light source light is emitted as S-polarized light.

The S-polarized light enters the light valve 111 via the condenser lens 110, so that the light valve 111 is efficiently illuminated.

In such a case, by disposing the PBS array 108, the half-wave plate 109, and the like,
Certainly, the first lens plate 104 and the second lens plate 105
Compared to a lighting device that uses only S-polarized light, it is possible to achieve much higher brightness in terms of polarized light illumination to the light valve 111.

In other words, in the method using the first lens plate 104 and the second lens plate 105 and not using the PBS array 108 or the like, since the randomly polarized light is illuminated on the light valve 111, Is used as incident light because it is linearly polarized light in one direction.

[0012]

However, the demand for higher brightness of a projected image of a recent projection type display device has not been stopped, and further higher brightness has been demanded.

[0013] In this respect, the polarized light illuminating device in the conventional method is not always satisfactory as described later, and the present inventors have studied this polarized light illuminating device as a comprehensive polarizing device including a light source section. It has been found that the function inherent in the polarizing device is not sufficiently exhibited.

SUMMARY OF THE INVENTION It is an object of the present invention to sufficiently exhibit the inherent functions of the conventional method and to achieve even higher brightness polarized illumination.

[0015]

In view of such a problem, the invention described in claim 1 is a light source unit and a lens plate in which a plurality of lenses are arranged in a plane, and the light source unit emits light from the light source unit. A first lens plate that divides the light of the light source into a light flux determined by an aperture formed by the plurality of lenses, and another lens plate that has a plurality of lenses in a planar manner,
A second lens plate in which the plurality of lenses of the lens plate respectively form bright spots on the plurality of lenses of the other lens plate, and light emitted from individual bright spots of the plurality of lenses of the second lens plate. A prism array to be incident, the prism array is a prism array including a polarizing beam splitter having a polarization splitting unit and a reflecting prism having a total reflection mirror, and is disposed on the exit surface of the prism array.
The light emitted from the bright spot incident on the prism array is polarized and separated by a polarizing beam splitter constituting the prism array, and one of the P-polarized light or the S-polarized light emitted from the prism array is converted into the other polarized light. And a half-wave plate for conversion, wherein the luminescent spot on the lens of the second lens plate is emitted to a polarizing beam splitter adjacent to the reflection prism constituting the prism array. The incident light, and the light reflected by the polarization splitting section of the polarization beam splitter is made incident on the reflection prism, incident on the total reflection mirror of the reflection prism, reflected, and emitted from the reflection prism. And the 波長 wavelength plate disposed on the exit surface of the prism array is the second lens plate near the optical axis. A region corresponding to a substantially central portion, in a region other than the central portion, characterized in that the polarization device arrangement form is different.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the half-wave plate disposed on the exit surface of the prism array has a plurality of polarization beam splitters. The region corresponding to the substantially central portion of the second lens plate in the vicinity of the optical axis and the region other than the central portion are disposed on different polarizing beam splitters, thereby corresponding to the substantially central portion. And a region other than the central portion has a different arrangement form.

According to a third aspect of the present invention, in addition to the configuration described in the first aspect, the half-wave plate disposed on the exit surface of the prism array is provided with the second half near the optical axis. In a region corresponding to a substantially central portion of the lens plate, the plurality of polarizing beam splitters are arranged continuously over a plurality of polarizing beam splitters, and in a region other than the central portion, some of the plurality of polarizing beam splitters are arranged. Thus, the arrangement form is different between the region corresponding to the substantially central portion and the region other than the central portion.

According to a fourth aspect of the present invention, there is provided a polarizing device including a light source unit, and P-polarized light or S-polarized light emitted from the polarizing device.
A color separation optical system that separates polarized light into R light, G light, and B light; a light valve that is arranged for each color light that emits each color light by the color separation optical system by modulating each color light with a signal of each color light; An analysis optical system that detects modulated light from the light emitted from the light valve of each color light, a synthesis optical system that performs color synthesis of each color analysis light by the analysis optical system, and projects the synthesized light by the synthesis optical system. And a projection optical system, wherein the polarizing device is a lens plate in which a light source unit and a plurality of lenses are arranged in a plane, and the light source unit emits light emitted from the light source unit to the plurality of lenses. A first lens plate for splitting into a light beam determined by the aperture defined by the above, and another lens plate having a plurality of lenses in a plane, wherein each of the plurality of lenses of the first lens plate is the other lens plate Bright spots on multiple lenses A prism array on which light emitted from individual bright points of a plurality of lenses of the second lens plate is incident, wherein the prism array includes a polarization beam splitter having a polarization separation unit. And a prism array including a reflection prism having a total reflection mirror, and a light, which is disposed on the prism array emission surface and is emitted from the luminescent spot incident on the prism array, is polarized by a polarization beam splitter included in the prism array. A polarizing device comprising: a half-wave plate for converting one of the P-polarized light or the S-polarized light emitted from the prism array after being separated into the other polarized light; Light emitted from a bright spot on the lens of the second lens plate and incident on a polarizing beam splitter adjacent to the reflection prism, The prism array is set so that light reflected by the polarization splitting unit of the polarization beam splitter is made incident on the reflection prism, made incident on a total reflection mirror of the reflection prism to be reflected, and emitted from the reflection prism. The half-wave plate disposed on the exit surface of the second lens plate has a different arrangement form between a region near the optical axis corresponding to the substantially central portion of the second lens plate and a region other than the central portion. It is a projection type display device as a polarizing device.

According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the half-wave plate disposed on the exit surface of the prism array of the polarizing device includes a plurality of polarizing beam splitters. In a region corresponding to a substantially central portion of the second lens plate near the optical axis and a region other than the central portion, different polarization beam splitters are disposed at different positions in the second lens plate, whereby the substantially central portion is disposed. The arrangement form is different between a region corresponding to the portion and a region other than the central portion.

According to a sixth aspect of the present invention, in addition to the configuration of the fourth aspect, the half-wave plate disposed on the exit surface of the prism array of the polarizing device is disposed near the optical axis. In a region corresponding to a substantially central portion of the second lens plate,
It is arranged continuously over a plurality of polarization beam splitters, and in the region other than the central portion, by being arranged every other in the plurality of polarization beam splitters,
The arrangement form is different between a region corresponding to the substantially central portion and a region other than the central portion.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Analysis of Conventional Method for Achieving the Present Invention] FIG. 17 is an enlarged view showing a part of a polarizing device according to a conventional method. In this figure, a first lens plate 104, a second lens plate 105, a PBS array 108, and a half-wave plate 109 are illustrated. The polarizing device here includes a light source unit 102 in addition to the above, but the condenser lens 1
The polarization illuminating device includes a condenser lens 110 in the polarization illuminating device.

According to the description of this figure, light from the light source that enters near the optical axis of the first and second lens plates 104 and 105 is condensed on the lens 106 of the second lens plate 105 and is focused on the center of the lens 106. It is described that small bright spots are formed.

However, the present inventors have described that the center part of the first lens plate 104 and the second lens plate 105 in the above-mentioned conventional polarizing device is as described in the conventional example (forming a small bright spot). Rather, the size of the bright spot of the lens 106 substantially at the center of the second lens plate 105 covers almost the entire opening formed by the lens 106, and the luminance distribution of the larger bright spot has a central portion. I found that the periphery was higher.

This is understood from the fact that the light source lamp 100 having a predetermined size is provided at the center of the light source unit 102, and this state is described in FIG.

In other words, the reason is that the light flux does not enter the lens 103 disposed substantially at the center of the first lens plate 104 in a direction parallel to the optical axis but at a predetermined inclination. As a result, the light beam incident on the lens 103 is incident on the corresponding lens 106 of the second lens plate 105 as a bright point of the entire aperture formed by the lens 106.

That is, the lens 1 of the second lens plate 105
At 06, the light fluxes shown in the figure enter the central portion and the peripheral portion of the lens 106. Among them, there are more light beams incident on the peripheral portion than in the central portion shown in FIG. This means that more light beams enter the lens 103 of the first lens plate 104 at an angle to the optical axis than light beams incident parallel to the optical axis.

The light beam shown in FIG.
06, passes through the lens 106, and
07, and the P-polarized light transmitted through the polarization separation unit 107a, and the P-polarized light reflected by the polarization separation unit 107a
The light is separated into S-polarized light incident on S107. The S-polarized light is reflected by the polarized light separating portion 107a of the adjacent PBS 107 and exits the PBS 107. The P-polarized light is a half-wave plate 10 arranged on the exit surface of the PBS 107.
9, the light is converted into S-polarized light (−S), and is eventually emitted as S-polarized light.

The light valve 111 is illuminated by the S-polarized light.

On the other hand, the lens 10 near the optical axis shown in FIG.
6 enters the PBS 107 via the lens 106, and the P-polarized light that passes through the polarization separation unit 107a of the PBS 107 and exits is 1 /
Since it is out of the two-wavelength plate 109, it is emitted as P-polarized light (-P, -P) as it is. In addition, PBS1
The S-polarized light reflected by the polarization separation unit 107a enters the adjacent PBS 107 and is polarized by the polarization separation unit 107a.
Then, the reflected light is emitted from the PBS 107 and converted into P-polarized light by the half-wave plate 109 arranged on the emission surface.

The P-polarized light is absorbed by an S-polarized light transmitting polarizing plate (not shown) disposed on the incident side of the incident light valve constituting the light valve 111, and the illumination light of the light valve 111, and finally, , Not used as projection light.

Therefore, the S-polarized light, which is originally required as the incident polarized light of the light valve 111, is formed only from the light incident on the vicinity of the center of the lens 106, and the light incident on the peripheral portion is emitted as the P-polarized light. This does not contribute to the illumination of the light valve 111, and unnecessary P-polarized light is generated from the peripheral portion (central portion) of the second lens plate 105 along the optical axis. As described above, the P-polarized light that does not contribute to the illumination of the light valve 111 is generated, and thus, the projection display device of the above-described conventional publication does not sufficiently satisfy the requirement of increasing the brightness of the projected image.

Based on such an analysis, an embodiment of the invention for solving the above-mentioned problem will be described below.

[First Embodiment of the Invention] FIGS.
FIG. 1 is a diagram illustrating a polarization device according to a first embodiment of the present invention and a projection display device employing the same.

According to FIG. 1, the light source unit 1 is composed of a lamp 1a and a concave mirror 1b formed of a parabolic mirror. The light enters the first lens plate 2 on which the lens 2a is arranged in a plane via the ultraviolet absorption filter, and is split into light beams determined by the openings formed by the individual lenses 2a of the first lens plate 2. . Then, the light beam is incident on the second lens plate 3.

The second lens plate 3 includes a plurality of lenses 3a.
Are arranged in a plane, these lenses 3a are arranged corresponding to the individual lenses 2a of the first lens plate 2, and are set at the focal positions of the respective lenses 2a.

Although each of the lenses 2a and 3a is actually formed as 8 × 10 in length as described later, FIG. 1 shows six lenses as a sectional configuration diagram because it is too fine. .

The first lens plate 2 and the second lens plate 3 constitute a so-called fly-eye integrator.

Then, the light from the light source passing through the lens 2a of the first lens plate 2 is transmitted to the corresponding second lens plate 3 as described above.
Through the lens 3a, and is incident on the prism array 4 arranged close to or adhered to the exit surface of the second lens plate 3.

As shown in FIG. 2, the prism array 4 has fifteen PBSs 5 each having a square cross section and a square prism shape.
And one reflection prism 6 having the same shape as the reflection prism 6 are continuously arranged by bonding their side surfaces to each other, and have a plate shape as a whole. In FIG. 1, P
If a total of 16 pieces are described for the BS 5 and the reflection prism 6, they are too fine and difficult to see. Therefore, 12 pieces are omitted and described.

In each of the PBSs 5, a polarizing beam splitter 5a is disposed on a diagonal line having a square cross section so that an incident angle of an incident light parallel to the optical axis O is set to 45 degrees, and a reflection prism is provided. Similarly, a total reflection mirror 6a is arranged on the diagonal line of the square cross section 6 so that the incident angle of the incident light beam parallel to the optical axis O is set to 45 degrees.

Further, a half-wave plate 7 is disposed at a predetermined position on the exit surface side of the prism array 4 (details will be described later).

The first and second lens plates 2 and 3, the prism array 4 and the half-wave plate 7 constitute a polarizing device according to the present invention.

As described above, the lens 3a of the second lens plate 3
Passes through the lens 3a, enters the PBS 5 and the reflection prism 6 constituting the prism array 4, passes through the polarization splitting portion 5a of the PBS 5, and is disposed on the emission surface. S converted by the half-wave plate 7
The polarized light is reflected by the polarization separation section 5a of the PBS 5 and is incident on the adjacent PBS 5 or the reflection prism 6, and is reflected and emitted by the polarization separation section 5a of the adjacent PBS 5 or the total reflection mirror 6a of the reflection prism 6. S-polarized light is formed.

As will be described later in detail, the light that has entered the reflecting prism 6 is reflected by the total reflection mirror 6a, enters the adjacent PBS 5, is reflected and emitted by the polarization splitting section 5a of the PBS 5, and is reflected by the PBS 5. S-polarized light converted to P-polarized light by the half-wave plate 7 and
a, and is polarized and separated into P-polarized light that is discarded. That is, the reflection prism 6 having the total reflection mirror 6a
Is not used as illumination light for the light valve 16.

As described above, the light source light is converted into light containing S-polarized light for illuminating the light valve 16 and unnecessary P-polarized light, and is emitted from the polarizing device of the present invention.

The light emitted from the polarizing device enters the cross dichroic mirror 11 via the condenser lens 8. This cross dichroic mirror 1
Reference numeral 1 denotes an arrangement in which the B light reflecting dichroic mirror 10 and the G and R light reflecting dichroic mirrors 9 are orthogonal to each other and are incident at 45 degrees with respect to the incident optical axis. The cross dichroic mirror 11 performs color separation into R light and G and R mixed light, which are parallel to each other and have opposite optical axes.

The color-separated B light is transmitted to the bending mirror 1
The light then travels with the optical axis changed to a right angle by 2, and is incident on the B light polarization beam splitter 13B provided with a polarization separation unit so that S polarized light of the B light is reflected and P polarized light is transmitted.

On the other hand, the R and G mixed light travels with the bending mirror 14 changing the optical axis to a right angle, and the G light is arranged on the optical axis at an incident angle of 45 degrees with respect to the incident optical axis. The G light that is incident on the light reflecting dichroic mirror 15 and is reflected and travels while changing the optical axis to a right angle, and the R light that travels as it is
Color separated into light and light.

The color-separated G light and R light are polarized light splitters 13G for G light in which a polarization separation unit is disposed so that S-polarized light is reflected and P-polarized light is transmitted.
In addition, the light enters the polarization beam splitter 13R for R light.

That is, the dichroic mirrors 9, 10
And a dichroic mirror 15 to constitute a “color separation optical system” that separates the light into R, G, and B light.

The polarization beam splitters 13 B, 1 for each color light
3G, 13R, and enters the polarization beam splitter 13
A light valve 16B for B light, a light valve 16G for G light, and a light valve 16R for R light are arranged near the S-polarized light exit surface of each color that reflects and emits B, 13G, and 13R, respectively.

The light valves 16R, 16G, and 16B used in this embodiment are reflection valves of the electric writing type, and only the portions where the incident polarized light (S-polarized light) of a predetermined pixel portion is selected by each color signal. As the modulated light (P-polarized light), the unselected portion has a function of reflecting and emitting the same S-polarized light as the incident light.

Each color light valve 16R, 16G, 1
6B are again incident on the polarization beam splitters 13B, 13G, and 13R for each color light, and only the modulated light is transmitted by the polarization splitters of the polarization beam splitters 13B, 13G, and 13R to perform analysis and emission. The unmodulated light is reflected and discarded. The polarization beam splitters 13B, 13G, and 13R constitute an "analysis optical system" that detects modulated light from light emitted from the light valves 16R, 16G, and 16B for each color light. Then, the respective color analysis lights are incident on the cross dichroic prisms 18 constituting the “combining optical system” from different incident surfaces, respectively, and perform color combining.

This cross dichroic prism 18
Has a B light reflecting dichroic film 18B and R
A prism in which the light reflecting dichroic films 18R are arranged so as to be orthogonal to each other. The R light and the B light, which are the analysis light, incident on the prism 18, are reflected by the dichroic film 18R and the dichroic film 18B and The optical axis is changed to a right angle, the light beams travel in the same direction, and emerge from the prism 18.

On the other hand, the analysis light of the G light is transmitted through the two dichroic films 18B and 18R as they are, and the R light,
By traveling and exiting in the same optical axis direction as B light,
The color synthesis of the R, G, B light is achieved.

The combined light is incident on a projection lens 19 constituting a “projection optical system” and projected on a screen (not shown) as a full-color image.

The above is the configuration of the projection display device according to the present invention.

Here, the polarizing device according to the present invention will be described in more detail with reference to FIGS.

FIG. 2 shows the second embodiment of the polarizing device according to the present invention.
Lens plate 3, prism array 4, and half-wave plate 7
Is a perspective view as viewed from the exit surface side of the member.

The lenses 3a of the second lens plate 3 have an 8 × 10 arrangement as described above.
On the emission surface side, a columnar body with a square cross section
A prism array 4 having a BS 5 and a reflection prism 6 is arranged. This prism array 4
The side surfaces of the BS 5 or the reflecting prism 6 are adhered to each other, the sixth reflecting prism 6 is arranged from the left, and a total of 16 is arranged in the PBS 5 and the reflecting prism 6 in total. The polarization separation section 5a of the PBS 5 and the total reflection mirror 6a of the reflection prism 6 are arranged so as to be parallel to the optical axis O at 45 °.

The width of the PBS 5 or the reflection prism 6 is half the width of the lens 3 a of the lens plate 3, and the PBS 5 is disposed at the boundary position of the lens 3 a of the second lens plate 3. The lens 3a is arranged so as to correspond to the center of the incident surface of the PBS 5 or the reflecting prism 6.

The half-wave plate 7 arranged on the exit surface of the prism array 4 has an A-wavelength plate as shown by the hatched portion in FIG.
In the middle horizontal line cutting part in the A 'line, there is nothing from left, yes,
No, Yes, No, No, Yes, No, Yes, No, Yes, Yes, No, Yes,
No, it has an arrangement. In addition, the arrangement of the half-wave plate 7 in the upper and lower portions of the portion is represented by the portion indicated by the line BB 'in the figure as a representative from the left, none, yes, no, yes, no, no, no, yes,
No, Yes, No, Yes, No, Yes, No, Yes. In other words, a region corresponding to a substantially central portion of the second lens plate 3 in the vicinity of the optical axis O, which is equivalent to a total of two (2 × 2) lenses 3a with the optical axis O as a center. The arrangement of the half-wave plate 7 is different between the region where the half-wave plate 7 is formed and the region other than this region. That is, in the region corresponding to the substantially central portion, PBS
The half-wave plate 7 is arranged every other one of the five, and in the region other than the substantially central part, every other or three of the PBS 5 different from the PBS 5 in which the half-wave plate 7 is arranged at the central part. It is arranged every other. The size of the substantially central portion is a size corresponding to the size of a portion having a predetermined area, which is a high luminance portion of the second lens plate 3 described above.

Further, the polarizing device and the projection type display device of the present invention will be described with reference to FIGS.

FIG. 3 is a schematic diagram of a projection type display device using the polarization device of FIG. 2, and shows the polarization type device of the projection type display device at the position of the optical axis O, the condenser lens 8, the polarization beam splitter 13, and the light. FIG. 3 shows a ray diagram illustrating the bulb 16. This figure is a ray diagram in the arrangement of the half-wave plate 7 corresponding to the line AA 'in FIG.

In FIG. 3, the R light, the G light, and the B light should be described as shown in FIG. 1, but the optical path length to each light valve 16B, 16G, 16R is the same for each color light. Since all are the same, the description of the color separation optical system is omitted, each light valve 16B, 16G, 16R is a light valve 16, and the polarization beam splitter 1 for each color light is used.
3B, 13G and 13R are illustrated as the polarization beam splitter 13.

FIG. 5 shows the arrangement of the second lens 3 and the prism array 4 of the polarizer and the half-wave plate 7 in detail, and shows light rays for each lens 3a.

According to FIG. 3, the substantially parallel light source light emitted from the light source unit 1 is transmitted to the first lens plate 2 as described above.
Is split into a plurality of luminous fluxes by an aperture formed by the lens 2a (consisting of 8 × 10) constituting the lens plate 2,
Further, each split light beam is a second light beam corresponding to the lens 2a.
The light is incident on the lens 3 a constituting the lens plate 3. The outer periphery of the second lens plate 3 except for a portion having a predetermined area of a substantially central portion and having a high luminance portion due to the characteristics of the light source portion 1. In the portion, like the lens 3a of the second lens plate 3 described on the outermost side in FIG. 2 (shown as a light beam incident on the uppermost part of the second lens plate 3 in FIG. 3), The corresponding lens 2a of the first lens plate 2
Thus, the light is condensed on a predetermined position of the lens 3a, and forms a bright spot as a point light source at the position.

The light emitted from the bright point of the lens 3a is
As shown in FIG. 3, the PBS constituting the prism array 4
5, and is separated into P-polarized light that exits the PBS 5 and S-polarized light that is reflected by the polarization separation unit 5a. The P-polarized light is converted into S-polarized light by the half-wave plate 7 formed on the emission surface and emitted. The S-polarized light reflected by the polarization splitting unit 5a is
The light is incident on S5, reflected by the polarization splitting unit 5a of the PBS 5, and emitted. The S-polarized light emitted from these two PBSs 5 and 5 is both
Then, the light is incident on the polarization beam splitter 13, is reflected by the polarization separation unit of the polarization beam splitter 13, and is emitted, thereby efficiently illuminating the entire light valve 16.

However, as described above, the lens 3a at the substantially central portion of the second lens plate 3 is different from the outer peripheral portion due to the influence of the light source lamp 1a and the like, and a bright spot is generated at the central portion of the lens 3a. However, the bright spot has a spread, and the spread has a high luminance portion around the center of the lens 3a. In addition, the amount of light collected at the substantially central portion of the second lens plate 3 reaches most of the light incident on the whole including the outer peripheral portion of the second lens plate 3.

As described above, the lens 3a of the second lens plate 3 adjacent to the optical axis O in FIG.
In particular, since a bright spot having a high luminance is generated at the periphery thereof, light emitted from the bright spot (in FIG. 3, a bright spot caused by light incident near the lower side of the optical axis O). , The same applies to light incident near the upper side of the optical axis O).
Since the 波長 wavelength plate 7 is arranged in the transmitted light emission portion of the BS 5, the P light transmitted through the polarization separation portion 5 a is
The polarized light is converted into S-polarized light and emitted, and the S-polarized light reflected by the polarization separation unit 5a is reflected by the PBS 5 adjacent to the upper part.
And is reflected as it is by the PBS polarization separation section 5a, and is emitted as S-polarized light because the half-wave plate 7 is not disposed on the exit surface side of the PBS 5.

Light emitted from a luminescent spot on the outer peripheral portion (upper portion in FIG. 3) of the lens 3a near the upper side of the optical axis O is also P
The P-polarized light that has entered and transmitted the BS 5 is converted into S-polarized light by the half-wave plate 7 and emitted, and the S-polarized light reflected by the polarization separation unit 5a is reflected by the reflecting prism 6 adjacent to the upper part.
And is reflected by the total reflection mirror 6a as it is as S-polarized light and emitted.

On the other hand, the light (not shown in FIG. 3) emitted from the luminescent spot substantially at the center of the lens 3a and incident on the reflecting prism 6 is applied to the reflecting prism 6 as shown in FIG.
The light is reflected by the total internal reflection mirror 6a, is incident on the PBS 5 adjacent to the upper part, and is reflected by the polarization separation unit 5a.
The light is polarized and separated into S-polarized light that is reflected in the direction and P-polarized light that passes through the polarization separation unit 5a and travels through the prism array 4 and is discarded. The S-polarized light enters the polarization beam splitter 13 via the condenser lens 8 and is used as illumination light for the light valve 16.

The above description can be said in the same manner for the light source luminous flux described below the optical axis O of the polarizer in FIG. 3, but the reflection prism 6 is provided below the optical axis O in FIG. Are not arranged, all light rays incident on the prism array 4 are incident on the PBS 5, and FIG.
For the light emitted from the bright point of the second lens 3a below the optical axis O, the P-polarized light transmitted through the PBS 5 is １ ／.
While being converted by the wave plate 7 into S-polarized light, the S-polarized light reflected by the polarization splitting section 5a is
And is reflected by the polarization splitting unit 5a and converted into P-polarized light by the half-wave plate 7 disposed on the exit surface, and the P-polarized light cannot be used as illumination light of the light pulp 16. .

On the other hand, FIGS. 4 and 6 show ray diagrams at the position of line B-B 'in FIG. In this position, all the lenses 3a of the second lens plate 3 form a luminescent spot substantially at the center of each lens 3a, and light emitted from the center is reflected by the PBS 5 and the reflection prism 6 arranged on the emission surface. Is incident on.

The P-polarized light that enters and transmits the PBS 5 is converted into S-polarized light by the half-wave plate 7 disposed on the exit surface. The S-polarized light reflected by the polarization separation unit 5a enters the PBS 5 adjacent to the upper part of the figure, is reflected by the polarization separation unit 5a, and is emitted as S-polarized light. These S-polarized lights can contribute to illumination of the light valve 16.

The light that has entered the reflecting prism 6 is reflected by the total reflection mirror 6a, enters the adjacent PBS 5, and is reflected by the polarization splitting unit 5a and emitted as S-polarized light. It is converted to polarized light. This S
The polarized light can contribute to the illumination of the light valve 16.

As described above, in the projection type display device using the polarizing device of the present invention, the reflection prism is disposed adjacent to the PBS 5 disposed substantially at the center of the second lens plate 3. By arranging 6, a part of the light beam incident on the reflection prism 6 from the first lens plate 2 side cannot be used as illumination light to the light valve 16, but originally, the entire second lens plate 3 is used. The light incident on the substantially central portion of the lens plate 3 that covers most of the incident light is reflected by the polarization splitting portion 5a of the PBS 5 disposed in the central portion, and the polarized light incident on the reflecting prism 6 is incident. Is reflected by the total reflection mirror 6 a of the reflection prism 6 and emitted, and the light valve 16 can be effectively illuminated together with the light transmitted through the adjacent PBS 5.

By the way, in the prior art, the light incident on the substantially central portion of the second lens plate 3 could not be used as the illumination light of the light valve 16 almost effectively. Illumination can be achieved, and as a result, a projection display device capable of projecting a high-brightness projected image can be provided.

[Second Embodiment of the Invention] FIGS. 7 to 10
Shows a second embodiment of the present invention.

The second embodiment is similar to the first embodiment in that 16 PBSs 5 and 16 reflecting prisms 6 are arranged in an array, but in the first embodiment the reflecting prism 6 Although only one was used,
In the second embodiment, two reflecting prisms are used. The sixth and eleventh reflecting prisms 6 from the left in FIG.
Is arranged. Others are PBS5, these PB
S5 polarization separation section 5a and two reflection prisms 6b
The total reflection mirrors 6a are all arranged in parallel. The PBS 5 and the half-wavelength plate 7 arranged on the exit surface of the reflection prism 6 have no, yes, no, yes, left from the left along the line AA 'in FIG.
No, no, yes, no, yes, no, no, yes, no, yes, no, yes, and no, yes, no, yes, no from the left along the BB 'line , No, no, yes, no, yes, no, yes,
No, yes, no, yes. In other words, a region corresponding to a substantially central portion of the second lens plate 3 in the vicinity of the optical axis O, which is equivalent to a total of two (2 × 2) lenses 3a with the optical axis O as a center. The arrangement of the half-wave plate 7 is different between the region where the half-wave plate 7 is formed and the region other than this region. That is, the half-wave plate 7 is arranged every other PBS 5 in the region corresponding to the substantially central portion, and the PBS 5 in which the half-wave plate 7 is arranged in the central portion in the region other than the substantially central portion. And every other or every third PBS5. The size of the substantially central portion is a size corresponding to the size of a portion having a predetermined area, which is a high luminance portion of the second lens plate 3 described above.

FIG. 8 is a ray diagram in a portion along the line AA ′ in FIG. 7 for use in a projection type display device.
9 and FIG. 9 and FIGS. 4 and 10 of the first embodiment show ray diagrams along a line B-B '. However, the eleventh P from the top in the diagram of the prism array 4 in FIG.
BS5 is regarded as a reflection prism 6.

The upper and lower lenses 3 sandwiching the optical axis O, which is a high-brightness portion, spread at the center of the second lens plate 3 in FIGS.
Light emitted from a high luminescent spot near the optical axis O at the periphery of the light a is emitted as P-polarized light transmitted through the PBS 5 as S-polarized light by the half-wave plate 7 arranged on the emission surface as shown in the figure. The S-polarized light reflected by the polarization separation unit 5a is incident on the PBS 5 adjacent to the upper part of each other, and the polarization separation unit 5a of the PBS 5
Is reflected and emitted. These S-polarized lights are used as illumination light for the light valve 16.

The light emitted from the bright spot on the lower peripheral edge of the lower lens 3a of the optical axis O enters the reflecting prism 6, all the light is reflected by the total reflecting mirror 6a, and enters the upper adjacent PBS 5. The light is reflected and emitted by the polarization separation unit 5a, and is separated into S-polarized light used for illumination of the light valve 16 and P-polarized light that proceeds as it is and is discarded.

The light emitted from the bright spot on the upper peripheral edge of the upper lens 3a of the optical axis O enters the PBS 5 and passes through the P5.
The polarized light is converted into S-polarized light by the half-wave plate 7 arranged on the exit surface, and the S-polarized light reflected by the polarization splitting unit 5a is incident on the reflection prism 6 adjacent to the upper part from the side, and is totally reflected by the total reflection mirror 6
The light is reflected by a and emitted as it is as S-polarized light. The two S-polarized lights are used for illuminating the light valve 16.

The light emitted from the luminescent spot approximately at the center of the second lower lens 3a from the optical axis O enters the PBS 5, and the P-polarized light transmitted and emitted is 1 / The light is converted into S-polarized light by the two-wavelength plate 7. On the other hand, the polarization separation unit 5
The S-polarized light reflected at a enters the reflection prism 6 adjacent to the upper portion from the side, is reflected by the total reflection mirror 6a, and is emitted as it is as S-polarized light.

The second lens 3a on the upper side from the optical axis O
The light emitted from the luminescent spot at the substantially central portion of the light enters the reflection prism 6, is totally reflected by the total reflection mirror 6a, is incident on the PBS 5 adjacent to the upper part, and is reflected by the polarization separation portion 5a. The light is separated into P-polarized light, which proceeds as it is and is discarded. The S-polarized light is used to illuminate the light valve 16.

On the other hand, the B-B ′ shown in FIG. 4 and FIG.
In the light ray explanatory diagram along the line, as described in the first embodiment, since the luminescent spot is formed substantially at the center of the lens 3a, the light is emitted from the luminescent spot of the lens 3a. If the incident light is PBS5, the transmitted P-polarized light is converted into S-polarized light by the half-wave plate 7,
The S-polarized light reflected by the polarization splitting unit 5a is reflected on the PBS
The light is reflected by the polarization splitting unit 5a or the total reflection mirror 6a of the reflection prism 6, and is emitted as S-polarized light as it is. In the case where the light is incident on the reflection prism 6, the light is totally reflected as it is and is incident on the adjacent PBS 5, and the polarized light is separated therefrom.
Only the S-polarized light reflected by a is emitted and used as illumination light for the light valve 16.

As described above, the light incident on the reflecting prism 6 is reflected by the total reflection mirror 6a of the prism 6 and transmitted through the polarization separating section 5a of the light incident on the adjacent PBS 5. Most of the light emitted from the high-brightness portion near the optical axis O of the second lens plate 3 is given as S-polarized light to the illumination of the light valve 16 except for the P-polarized light which proceeds and is discarded as it is. And high-intensity illumination can be achieved, and a projection-type display device using the polarizing device can project a high-intensity projection image.

[Embodiment 3] FIGS. 11 to 15
Shows a third embodiment of the present invention.

In the third embodiment, as shown in FIG. 11, etc., as compared with the first and second embodiments, the PBS 5 and the reflection prism 6 on the left side (up to the eighth position) from the optical axis O are closer to the optical axis O. The arrangement of each polarization separation section 5a and total reflection mirror 6a with respect to the PBS 5 and the reflection prism 6 arranged on the right side (9th to 16th from the left) is parallel, but the orientation is left and right. 11 in that they are arranged symmetrically with respect to a plane passing through the optical axis O and extending in the vertical direction in FIG. The lens 3 of the second lens plate 3
a and the P of the prism array 4
It is arranged so that a boundary line which is a connection line between the BS 5 and the reflection prism 6 coincides. And the total reflection mirror 6
The positions at which the reflecting prisms 6 having a are arranged are the sixth and eleventh positions from the left in FIG.

The half-wave plate 7 arranged on the exit surface of the prism array 4 is provided with a PBS 5 and a reflection prism 6.
In the portion along the line A-A 'in FIG. 11, there are no, no, no, no, no, no, no, no, no
Yes, Yes, No, No, Yes, No, Yes, No, and B-B '
In the part along the line, from the left nothing, yes, no, yes, no,
No, no, yes, yes, no, no, no, yes, no, yes, no.
That is, in a region corresponding to a substantially central portion of the second lens plate 3, the half-wave plate 7 includes a plurality of (here, four) PBSs.
.., And in a region other than the substantially central portion thereof, a half-wave plate 7 is disposed every other or three, and a region corresponding to the substantially central portion thereof; The arrangement of the half-wave plate 7 is different from the region other than the substantially central portion.

In the ray diagrams of the projection type display device and the polarizing device, the portion along the line AA ′ is shown in FIG.
2. FIG. 14 shows a portion along the line B-B 'in FIG.
3 and FIG.

First, FIG. 1 showing a portion along the line AA ′
2 and FIG. In a range corresponding to 2 × 2 lenses 3a close to the optical axis O (a range corresponding to a substantially central portion of the second lens plate 3), as described above, there is a luminescent spot extending over the region. .

The light emitted from the luminescent spot of the lens 3a corresponding to the region is polarized into the P-polarized light that has been transmitted through the polarization separation unit 5a of the PBS 5 and the S-polarized light that is reflected by the polarization separation unit 5a. Separated. The P-polarized light is all １ ／ on its exit surface in the four PBSs 5 in the center.
Since the wave plate 7 is arranged, the light is converted into S-polarized light and emitted. The S-polarized light reflected by the polarization splitting unit 5a is such that light incident on the PBS 5 below the optical axis O in the drawing is incident on the lower adjacent PBS 5 or the reflecting prism 6, and conversely on the optical axis O. The light incident on the PBS 5 above O is incident on the upper adjacent PBS 5 or the reflecting prism 6.

The S-polarized light incident on the adjacent PBS 5 is reflected by the polarization splitting section 5a, but is converted to P-polarized light because the half-wave plate 7 is disposed on the exit surface. On the other hand, if the adjacent prism on which the S-polarized light is incident is the reflection prism 6, the S-polarized light is reflected and emitted by the total reflection mirror 6a as it is.

The S-polarized light can contribute to the illumination of the light valve 16.

As described above, the light from the high-brightness portion of the entire central portion of the second lens plate 3 can be used as illumination light except for a part, and a part of the light from the outer peripheral portion of the portion is used. Cannot be used as the illumination light of the light valve 16, but the brightness of the illumination light of the light valve 16 can be remarkably improved as compared with the conventional example.

On the other hand, at the outer peripheral portion of the second lens plate 3 other than the central portion, a predetermined position of each lens 3a (in FIG. 12 and FIG. 14, the optical axis O side of each lens 3a) based on the fly-eye integrator design. (A position close to) a light spot is generated, and light emitted from the point is incident on the PBS 5 or the reflection prism 6. S is converted into S-polarized light, emitted, and reflected by the polarization splitting unit 5a.
The polarized light enters the adjacent PBS 5 and is reflected and emitted by the polarized light separating unit 5a as it is, thereby contributing to the illumination of the light valve 16. In addition, all the light that has entered the reflection prism 6 is reflected by the total reflection mirror 6a, enters the adjacent PBS 5, and emits only the S-polarized light reflected by the polarization separation unit 5a, thereby contributing to illumination.

Next, FIG. 1 showing a portion along the line BB ′
3 and FIG. In the lens 3a of the second lens plate 3, as described above, a luminescent spot is generated at a predetermined position of each lens 3a (a place closer to the optical axis O side of each lens 3a in FIGS. 13 and 15). The light emitted from the point is incident on the PBS 5 or the reflection prism 6 of the prism array 4, and in the case of the PBS 5, the transmitted P-polarized light is converted into the S-polarized light by the 波長 wavelength plate 7 and emitted, and the polarized light is separated.
The S-polarized light reflected by the light enters the adjacent PBS 5 and is reflected and emitted as S-polarized light. Further, the light incident on the reflection prism 6 is reflected by the total reflection mirror 6a and is reflected by the adjacent PB.
Only S-polarized light that enters S5 and is reflected and emitted by the polarization splitting unit 5a is used as illumination light for the light valve 16.

As described above, a part of the light incident on the reflecting prism 6 cannot be used as illumination light for the light valve 16, but the light amount around the optical axis O of the second lens plate 3 is originally limited to the outer peripheral portion. The unusable portion is not a serious problem, and it can be said that the present invention that can effectively use the light around the optical axis O is significant.

The polarizing device described in each of Embodiments 1 to 3 is a projection type display device using the polarizing device.
The illumination light to the light valve 16 is configured to illuminate with the S-polarized light reflected by the polarization beam splitter 13 of the polarization beam splitter 13 incident thereon. May be illuminated. In this case, the polarized light emitted from the polarizing device is mostly P
It is necessary to configure the polarization plate to be polarized light. For that purpose, the position where the half-wave plate 7 is disposed is not disposed at the position where the half-wave plate 7 is disposed in each of the above-described embodiments. This can be achieved by arranging the parts at positions not arranged at the positions.

In each of the first to third embodiments, an embodiment in which a high-luminance area is generated over 2 × 2 areas near the optical axis O of the second lens plate 3 constituting the polarizing device. Met. This is the light source unit 1
Form, lenses 2a, 3a of first and second lens plates 2, 3
Depends on the size, arrangement, etc. of the
When the number of lenses is increased, the number of lenses 2a and 3a included in the high-luminance area further increases,
Accordingly, the number of PBSs 5 constituting the prism array 4 increases.

Further, the case where the polarizer described in each of Embodiments 1 to 3 is employed in the projection type display device shown in FIG. 1 has been described. It goes without saying that the present invention is not limited to the projection type display device having the configuration described above.

Further, the "color separation optical system" also converts the B light and the R light which are reflected by the cross dichroic mirror and color-separated to the opposite side, and the G light which passes through the cross dichroic mirror and travels. It may be configured, or a “color separation optical system” of another configuration may be used. In addition, the light valve 16 to be used does not need to be limited to the reflection type, and a transmission type light valve can be used.

[0105]

As described above, according to the invention described in each of the claims, the substantially central portion of the second lens plate is located closer to the peripheral portion than the central portion of the lens constituting the lens plate. In view of the fact that the light intensity distribution is higher, the light emitted from the bright spot on the lens of the second lens plate and incident on the polarizing beam splitter adjacent to the reflecting prism forming the prism array, The light reflected by the polarization separation unit is made to enter the reflection prism, and is made to enter the total reflection mirror of the reflection prism to be reflected, and is set to be emitted from the reflection prism.
The half-wave plate placed on the exit surface of the prism array
Since the arrangement of the region corresponding to the substantially central portion of the second lens plate near the optical axis is different from that of the region other than the central portion, the light emitted from the portion corresponding to the portion in the conventional method. Could not illuminate the light valve, but the light emitted from the portion can be used as illumination light for the light valve. as a result,
Illumination can be achieved with high brightness to the light valve, and a great effect that a high-brightness projected image can be obtained can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a polarizing device and a projection display device according to a first embodiment of the present invention.

FIG. 2 shows 1/1 used in the polarization device according to the first embodiment.
It is a perspective view of a prism array in which a two-wavelength plate is arranged, a second lens plate, and the like.

FIG. 3 is a ray diagram of a projection type display device using the polarizing device according to the first embodiment, taken along a line AA ′ in FIG. 2;

FIG. 4 is a ray diagram of a projection type display device using the polarizing device according to the first embodiment, taken along a line BB ′ in FIG. 2;

FIG. 5 is a detailed ray diagram of the polarizing device according to the first embodiment, taken along a line AA ′ of FIG. 2;

FIG. 6 is a detailed ray diagram of the polarizing device according to the first embodiment, taken along a line BB ′ in FIG. 2;

FIG. 7 is a perspective view of a prism array having a half-wave plate used in a polarizing device according to Embodiment 2 of the present invention, a second lens plate, and the like.

FIG. 8 is a ray diagram of a projection type display device using the polarizing device according to the second embodiment, taken along a line AA ′ of FIG. 7;

FIG. 9 is a detailed ray diagram of the polarization device according to the second embodiment, taken along a line AA ′ of FIG. 7;

FIG. 10 is a detailed ray diagram of the polarization device according to the second embodiment, taken along a line B-B 'in FIG.

FIG. 11 shows a prism array in which a half-wave plate used in a polarizing device according to a third embodiment of the present invention and a second prism array are provided.
It is a perspective view of a lens plate etc.

FIG. 12 is a ray diagram of a projection type display device using the polarizing device according to the third embodiment, taken along a line AA ′ of FIG. 11;

FIG. 13 is a ray diagram of a projection type display device using the polarizing device according to the third embodiment, taken along a line BB ′ in FIG. 11;

FIG. 14 is a detailed ray diagram of the polarizing device according to the third embodiment, taken along a line AA ′ of FIG. 11;

FIG. 15 is a detailed ray diagram of the polarization device according to the third embodiment, taken along a line BB ′ in FIG. 11;

FIG. 16 is an overall explanatory configuration diagram of a conventional polarized illumination device.

FIG. 17 is a ray diagram of the conventional polarization device.

[Explanation of symbols]

 Reference Signs List 1 light source unit 2 first lens plate 2a lens forming first lens plate 3 second lens plate 3a lens forming second lens plate 4 prism array 5 PBS forming prism array 5a polarization separation unit 6 forming prism array Reflecting prism 6a Total reflection mirror 7 1/2 wavelength plate 8 Condenser lens 9,10,11,15 Dichroic mirror (color separation optical system) 12,14 Folding mirror 13,13R, 13G, 13B Polarization beam splitter (Analysis Optical system) 16,16R, 16G, 16B Light valve 18 Cross dichroic prism (synthetic optical system) 19 Projection lens (projection optical system)

Claims (6)

[Claims] 1. A lens plate in which a light source unit and a plurality of lenses are arranged in a plane, and wherein a light source emitted from the light source unit is divided into light beams determined by openings formed by the plurality of lenses. One lens plate and another lens plate having a plurality of lenses in a plane,
A plurality of lenses of the first lens plate each forming a bright point on a plurality of lenses of the other lens plate; and a plurality of lenses emitted from each of the plurality of lenses of the second lens plate. A prism array having a polarizing beam splitter having a polarization splitting section and a reflecting prism having a total reflection mirror, and a prism array arranged on an exit surface of the prism array. The light emitted from the bright spot incident on the prism array is polarized and separated by the polarization beam splitter constituting the prism array, and one of the P-polarized light or the S-polarized light emitted from the prism array is converted to the other polarized light. A polarizing device comprising: a half-wave plate for conversion; and a polarized light adjacent to the reflection prism constituting the prism array. The light that emerges from the bright spot on the lens of the second lens plate and enters the beam splitter, and is reflected by the polarization separation unit of the polarization beam splitter, is incident on the reflection prism. The half-wave plate arranged on the exit surface of the prism array is set so as to be made incident on the total reflection mirror to be reflected and emitted from the reflection prism, and the second lens plate is located near the optical axis. The arrangement of the polarizer is different between a region corresponding to a substantially central portion of the device and a region other than the central portion. 2. The half-wave plate disposed on the exit surface of the prism array is disposed at every other position in a plurality of polarization beam splitters, and substantially in the center of the second lens plate near the optical axis. And the region other than the central portion are arranged in different polarizing beam splitters, so that the region corresponding to the substantially central portion and the region other than the central portion have different arrangement forms. The polarizing device according to claim 1, wherein: 3. The half-wave plate disposed on the exit surface of the prism array extends across a plurality of polarization beam splitters in a region near the optical axis and substantially corresponding to the center of the second lens plate. Are arranged continuously, and in the region other than the central portion, by being arranged every other in the plurality of polarization beam splitters, a region corresponding to the substantially central portion, and a region other than the central portion The polarizing device according to claim 1, wherein the arrangement is different. 4. A polarizing device including a light source unit, and P-polarized light or S-polarized light emitted from the polarizing device is converted into R light, G light.
A color separation optical system that separates the light into B light, a light valve that is arranged for each color light that modulates and emits each color light by the signal of the color light by the color separation optical system, and a light valve for each color light. An analyzing optical system for analyzing modulated light from the emitted light, a combining optical system for combining colors of each color analyzing light by the analyzing optical system, and a projection optical system for projecting combined light by the combining optical system. In the projection type display device, the polarizing device is a lens plate in which a light source unit and a plurality of lenses are arranged in a plane, and the light source light emitted from the light source unit is determined by an aperture formed by the plurality of lenses. A first lens plate for splitting the light beam to be split, and another lens plate having a plurality of lenses in a plane,
A plurality of lenses of the first lens plate each forming a bright point on a plurality of lenses of the other lens plate; and a plurality of lenses emitted from each of the plurality of lenses of the second lens plate. A prism array having a polarizing beam splitter having a polarization splitting section and a reflecting prism having a total reflection mirror, and a prism array arranged on an exit surface of the prism array. The light emitted from the bright spot incident on the prism array is polarized and separated by the polarization beam splitter constituting the prism array, and one of the P-polarized light or the S-polarized light emitted from the prism array is converted to the other polarized light. A polarizing device comprising: a half-wave plate for conversion; and a polarized light adjacent to the reflection prism constituting the prism array. The light that emerges from the bright spot on the lens of the second lens plate and enters the beam splitter, and is reflected by the polarization separation unit of the polarization beam splitter, is incident on the reflection prism. The half-wave plate arranged on the exit surface of the prism array is set so as to be made incident on the total reflection mirror to be reflected and emitted from the reflection prism, and the second lens plate is located near the optical axis. A projection type display device, wherein the polarizers are arranged differently in a region corresponding to a substantially central portion of the device and in a region other than the central portion. 5. A half-wave plate disposed on an exit surface of a prism array of the polarization device is disposed every other in a plurality of polarization beam splitters, and the half-wave plate of the second lens plate near an optical axis is disposed. The region corresponding to the substantially central portion and the region other than the central portion are arranged on different polarizing beam splitters, so that the region corresponding to the substantially central portion and the region other than the central portion have different arrangement forms. The projection type display device according to claim 4, wherein: 6. The half-wave plate disposed on the exit surface of the prism array of the polarizing device has a plurality of polarized beams in a region corresponding to a substantially central portion of the second lens plate near an optical axis. It is arranged continuously over the splitter, and in the region other than the central portion, by being arranged every other in a plurality of polarization beam splitters, a region corresponding to the substantially central portion, and a region other than the central portion 5. The projection type display device according to claim 4, wherein an arrangement form is different from that of the area.