JP2003185972A - Projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type display device in which the luminance of a projection image is increased by increasing a incident light quantity onto a light valve. <P>SOLUTION: The longitudinal direction of a polarization split part 40P constituting a polarization conversion part 40, a reflection part 40R and a 1/2 wavelength phase plate 42 which are disposed on the emission plane of a lens 32a is orthogonalized in the direction of the rectangular long side of a second lens plate 32. Thereby, even when a light source image LI is inclined, almost all light beams emitted from a light source image LI on the lens 32a are made incident on a polarization split part 40P, and almost all light beams emitted from the polarization conversion part 40 and incident on a polarizing beam splitter are made incident on the light valve. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device.

[0002]

2. Description of the Related Art FIG. 14 is a diagram showing a basic configuration of a conventional projection type display device.

This projection type display device comprises an illumination optical system 510, a polarization beam splitter 576, a light valve 560 and a projection optical system 590.

The illumination optical system 510 includes a light source 520 and a first light source 520.
A lens plate 531, a second lens plate 532, a polarization conversion unit 540, and a condenser lens 550 are provided.

The light source 520 comprises a lamp 521 and a concave mirror 522 such as a parabolic mirror.

The first lens 531 has a plurality of lenses 531.
a are arranged in a matrix. In addition, the second lens 532
A plurality of lenses 532a are arranged in a matrix.
The lens 532a is arranged at the focal position of the lens 531a.

The polarization conversion unit 540 includes a plurality of polarization separation units 54.
It is composed of 1 and 1/2 wavelength phase plate 542. In the polarization splitting section 541, a polarization splitting section 540P and a reflecting section 540R are arranged in parallel with each other. A ½ wavelength phase plate 542 is arranged on the exit surface of the transmitted light of the polarization separation section 540P.

The polarization beam splitter 576 is the prism 5
It is composed of 76A and a prism 576B. A polarization splitting portion 576a is provided on the joint surface between the prisms 576A and 576B.

The light valve 560 is a reflective light valve.

The light source light emitted from the light source 520 is incident on the first lens plate 531 and is divided into a plurality of intermediate light fluxes. Then, the plurality of intermediate light beams are converted by the polarization conversion unit 540 into S-polarized light which is a single polarized light.

The S-polarized light enters through the condenser lens 550 from the prism 576A of the polarization beam splitter 576, is reflected by the polarization separation section 576a, and is reflected by the prism 576.
The light is emitted from A and enters the light valve 560.

The S-polarized light is modulated by the light valve 560, is emitted from the light valve 560, and is incident on the prism 576A of the polarization beam splitter 576.

The P-polarized light which is the modulated light is a polarized light separating portion 576a.
And is extracted as emitted light from the prism 576B. The emitted light enters the projection optical system 590, and a projection image is projected on the screen 505.

[0014]

In the above projection type display device, the shape of the light valve 560 is usually rectangular. However, when the long side of the light valve 560 is arranged so as to be orthogonal to the drawing, the light is changed. Compared to the case where the short side of the valve 560 is arranged orthogonal to the drawing,
The amount of light incident on the light valve 560 may decrease due to the following reasons, and as a result, the brightness of the projected image may decrease.

FIG. 15 (a) is an enlarged side view of the polarization converter,
FIG. 15B is a view on arrow A of FIG. Figure 15
The polarization conversion units of (a) and (b) are different from the polarization conversion unit of FIG. 14 in terms of the number of polarization separation members and 1/2 wavelength phase plates, but the same reference numerals are given.

The polarization splitting section 5 which constitutes the polarization converting section 540
40P, the longitudinal direction of each of the reflection section 540R and the ½ wavelength phase plate 542 arranged in parallel adjacent to the polarization separation section 540P is parallel to the longitudinal direction of the lens 532a of the second lens plate (1 / The width of the two-wavelength phase plate 542 is approximately 1/2 of the length of the short side of the lens).

The light that is directly incident on the polarization splitting portion 540P from the light source image LI on the lens 532a is P-polarized light that is polarized and split and transmitted, is reflected and is incident on the adjacent reflecting portion 540R, and is reflected by the reflecting portion 540R. The polarized light is separated into P polarized light and S polarized light traveling in the same direction.

The P-polarized light has a 1/2 wavelength phase plate 54 on the exit surface.
Since 2 is arranged, it is converted into S-polarized light by the ½ wavelength phase plate 542. That is, the P-polarized light is converted into S-polarized light by the polarization conversion unit 540.

However, the lens 53 of the second lens plate 532
Of the light source image LI on 2a, the light emitted from a part of the light source image LI inclined in the horizontal direction does not enter the polarization separation section 540P but directly enters the adjacent reflection section 540R.

The light incident on the reflecting portion 540R is reflected by the reflecting portion 540R, and the adjacent polarized light separating portion 540P is reflected.
Incident on. Half of this incident light is the polarization splitting unit 54.
It is separated into S-polarized light reflected by 0P and P-polarized light that travels through the polarization separation unit 540P. The P-polarized light further enters the adjacent reflecting portion 540R, is reflected by the reflecting portion 540R, and is emitted.

S reflected by the polarization splitting unit 540P
Polarized light is a half-wave phase plate 542 arranged on the exit surface.
Is converted into P-polarized light by.

Further, the P-polarized light is adjacent to the polarized light separating section 540.
It is incident on P, is transmitted through this, and is further adjacent to the reflection part 540.
The light enters R and is emitted as it is as P-polarized light.

That is, although originally S-polarized light is required, P-polarized light having a different vibration direction is mixed in the emitted light. When this light enters the polarization beam splitter, the P-polarized light passes through the polarization beam splitter and is discarded, the amount of light incident on the light valve decreases, and the brightness of the projected image decreases.

The present invention has been made in view of such circumstances, and an object thereof is to provide a projection type display device capable of increasing the amount of light incident on a light valve and achieving high brightness of a projected image. It is to be.

[0025]

In order to solve the above-mentioned problems, the invention according to claim 1 forms a matrix of a light source and a plurality of lenses having a rectangular outer shape for dividing the light source light into a plurality of light beams. From the second lens plate, the first lens plate arranged on the first lens plate, the second lens plate on which a plurality of lenses having a rectangular outer shape, into which a plurality of light beams divided by the first lens plate are incident, are arranged in a matrix. Band-shaped polarization splitting section that splits the first luminous flux of the incident light into the reflected first polarized light and the transmitted second polarized light, and reflects the first polarized light reflected by the polarized light splitting section in the same direction as the second polarized light. A strip-shaped reflecting section that is disposed in parallel with the polarization splitting section, and a strip-shaped 1 / section that is disposed so as to correspond to either one of the first polarization emitting section and the second polarization emitting section. A two-wavelength phase plate, and projects the second lens plate. A polarization conversion unit that converts a plurality of light beams into a single polarization, a light valve with a rectangular light incident surface that modulates the light emitted from the polarization conversion unit by incident light, and the light emitted from the light valve An analysis optical system for extracting light, a projection lens for projecting the modulated light extracted by the analysis optical system, the first lens plate, and the second lens
In a projection type display device comprising a lens plate, the polarization conversion unit, the light valve, the analysis optical system and a reference plane on which the projection lens is arranged, the analysis optical system is arranged perpendicular to the reference plane. And a long side of the light incident surface of the light valve is arranged perpendicular to the reference plane, and the polarization splitting portion and the reflecting portion of the polarization converting portion are formed. And the longitudinal direction of the half-wave phase plate is orthogonal to the long side direction of the lens forming the second lens plate.

According to a second aspect of the present invention, a light source, a first lens plate in which a plurality of lenses having a rectangular outer shape are arranged in a matrix, and the light source light is split into a plurality of light beams, and the first lens. Inject a plurality of light beams divided by the plate,
A second lens plate in which a plurality of lenses having a rectangular outer shape are arranged in a matrix, and a light flux from the second lens plate is incident,
A strip-shaped polarization splitting part that splits the first polarized light to be reflected and a second polarized light to be transmitted, and the first polarized light reflected by the polarized light splitting part to be emitted in the same direction as the second polarized light. A strip-shaped reflection portion arranged in parallel with the separation portion, and a strip-shaped half-wave phase plate arranged corresponding to either the first polarized light emitting portion or the second polarized light emitting portion. A polarization conversion unit that has a plurality of light beams emitted from the second lens plate and converts the light beams into a single polarization, and separates the light emitted from the polarization conversion unit into a plurality of color lights of red light, green light, and blue light. A color separation optical system and a light valve having a rectangular light incident surface, which is arranged for each color light and which receives and modulates each color light by the color separation optical system, and modulated light from light emitted from the light valve. An analysis optical system to be extracted and a modulation extracted by the analysis optical system. Color synthesizing optical system for synthesizing colors, a projection lens for projecting synthetic light color-synthesized by the synthesizing optical system, the first lens plate, the second lens plate, the polarization conversion unit, and the color separation optical system. A light valve, the light analysis optical system, the color combining optical system, and a reference plane on which the projection lens is arranged, the color combining optical system has a plurality of dichroic films, A plurality of dichroic films are arranged perpendicularly to the reference plane, and a long side of the light incident surface of each light valve is arranged perpendicular to the reference plane, and the polarization splitting unit and the reflection unit of the polarization conversion unit. And the longitudinal direction of the half-wave phase plate is orthogonal to the long side direction of the lens forming the second lens plate.

According to a third aspect of the present invention, a light source, a first lens plate in which a plurality of lenses having a rectangular outer shape are arranged in a matrix, and the light source light is split into a plurality of light beams, and the first lens. Inject a plurality of light beams divided by the plate,
A second lens plate in which a plurality of lenses having a rectangular outer shape are arranged in a matrix, and a light flux from the second lens plate is incident,
A strip-shaped polarization splitting part for splitting the first polarized light to be reflected and a second polarized light to be transmitted, and the first polarized light reflected by the polarized light splitting part to be emitted in the same direction as the second polarized light. A strip-shaped reflection portion arranged in parallel with the separation portion, and a strip-shaped half-wave phase plate arranged corresponding to either the first polarized light emitting portion or the second polarized light emitting portion. A polarization conversion unit that converts a plurality of light beams emitted from the second lens plate into a single polarization; a polarization separation optical system that makes the light emitted from the polarization conversion unit incident and performs polarization separation; A color-separating optical system that separates the light emitted from the optical system into red light, green light, and blue light, and a light-incident surface that is arranged for each of the color lights and that receives and modulates each color light by the color-separating optical system. Is a rectangular light valve and combines the light emitted from the light valve. A color combining optical system, an analyzing optical system that extracts modulated light from the combined light that has been subjected to color combination by the combining optical system, a projection lens that projects the modulated light extracted by the analyzing optical system, and the first lens. Plate, the second lens plate, the polarization conversion unit, the polarization splitting optical system, the color separation optical system, the light valve, the color combining optical system, the analyzing optical system, and the reference plane on which the projection lens is arranged. In the projection display device including, the polarization separation optical system and the analysis optical system are configured by a single polarization beam splitter having a polarization separation unit arranged perpendicular to the reference plane, and each of the lights. A long side of the light incident surface of the bulb is arranged perpendicularly to the reference plane, and the color separation optical system and the combining optical system are provided with a plurality of common dichroic films arranged perpendicularly to the reference plane. The longitudinal direction of the polarization splitting section, the reflecting section, and the ½ wavelength phase plate of the polarization converting section is orthogonal to the long side direction of the lens forming the second lens plate. To do.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a basic structure of a projection type display device according to a first embodiment of the present invention, FIG. 2 is a perspective view of the projection type display device, and FIG. 3 is a diagram showing a relationship between a reference plane and a screen. Is.

The folding mirror and the screen are not shown in FIG. Further, in FIGS. 2 and 3, the condenser lens is not shown.

Further, the reference plane A in FIGS. 2 and 3 corresponds to a plane parallel to the XY plane in FIG. The constituent members except the light source 20 are arranged on the reference plane A. Further, in FIGS. 2 and 3, the Y ′ axis and the Z ′ axis are coordinate axes formed by the side surface of the housing 30 holding the screen 5.

This projection type display device comprises an illuminating device 10, a condenser lens 50, a color separation / combination optical system 70, light valves 60B, 60R and 60G, and a projection lens 90.

The illumination device 10 includes a light source 20, a first lens plate 31, a second lens plate 32, and a polarization converter 40.

The light source 20 comprises a lamp 21 and a concave mirror 22 such as a parabolic mirror. X in the lamp 21 of the light source 20
The discharge electrodes are arranged so that the inter-electrode discharge is generated in the direction.

The color separation / combination optical system 70 includes a cross dichroic mirror 71, bending mirrors 72B and 72RG, a G light reflection dichroic mirror 73, and polarization beam splitters 76B, 76R and 7 which are arranged perpendicularly to the XY plane.
6G and a cross dichroic prism 77 are provided.

The cross dichroic mirror 71 is B
(Blue) Light reflection dichroic mirror 71B and R (red)
Dichroic mirror 71R that reflects light and G (green) light
G and G are arranged so as to be orthogonal to each other.

The cross dichroic mirror 71 color-separates the incident white S-polarized light into B light traveling in the -Y direction and mixed light of R light and G light traveling in the Y direction.

The bending mirror 72B changes the traveling direction of the color-separated B light to the X direction. Bending mirror 72RG
Changes the traveling direction of the color-separated mixed light of R light and G light to the X direction.

The G-light reflecting dichroic mirror 73 color-separates the color-separated mixed light of the R light and the G light into R light traveling in the -Y direction and G light traveling in the X direction.

Polarizing beam splitters 76B, 76R, 7
The light incident on 6G is reflected by each polarized light separating portion and emitted from the emission surface. In addition, the polarization beam splitters 76B and 7B
Reference numerals 6R and 76G split the light reflected by the light valves 60B, 60R and 60G into P-polarized light that is modulated light that passes through the polarization splitting portion and S-polarized light that is non-modulated light that is reflected by the polarization splitting portion.

Polarizing beam splitters 76B, 76R, 7
The plane forming the 6G polarization splitting unit is 4 with respect to the incident optical axis.
They are arranged so that an incident angle of 5 degrees is formed and are arranged perpendicular to the XY plane.

The cross dichroic prism 77 is a composite prism member in which an R light reflection dichroic film 77R and a B light reflection dichroic film 77B are arranged so as to be orthogonal to each other. R light reflection dichroic film 77R
And the B light reflection dichroic film 77B are arranged perpendicularly to the XY plane.

The light valves 60B, 60R and 60G are
For example, it is an electro-writing type reflective light valve, and has a plurality of pixels arranged in a matrix. Light valve 60B,
The shape of the incident illumination area of 60R and 60G is a rectangle,
The light valves 60B, 60R, and 60G are arranged so that the long sides of the rectangle stand perpendicular to the XY plane.

The light valves 60B, 60R and 60G are
The predetermined pixel selected by the color signal of the incident polarized light (second polarized light) is converted into the second polarized light having a different polarization direction and the first polarized light having the oscillation direction orthogonal to each other, and the second polarized light is selected for the pixel not selected. It has a modulation function of reflecting and emitting as it is.

The projection lens 90 is a lens having a bending optical system for emitting the projection light in the direction parallel to the Z axis.

The screen 5 includes light valves 60B and 60B.
The R and 60G and the projection lens 90 have a conjugate relationship. A folding mirror 95 is arranged between the projection lens 90 and the screen 5. The folding mirror 95 is inclined by θ with respect to the vertical plane V (XZ ′ plane).

The screen 5 on which the projection image is projected and the reference plane A (inclined by α with respect to the horizontal plane H (Y'-X plane)) do not have a vertical relationship, and as shown in FIG. The screen 5 has a predetermined inclination with respect to the reference plane A. The screen 5 is a plane parallel to the X axis and the Z ′ axis.

Detailed structures of the first lens plate 31, the second lens plate 32, and the polarization converter 40 will be described with reference to FIGS. 4 and 5.

FIG. 4 is an enlarged exploded perspective view of the illuminating device, FIG. 5 is an enlarged view of the polarization converter, and FIG. 6 is a diagram showing a light source image formed on the second lens plate. It should be noted that FIG. 6 is a view of the second lens plate viewed from the X-axis direction.

As shown in FIG. 4, the first lens plate 31 has lenses 31a arranged in a matrix on a plane parallel to the YZ plane. Each lens 31a is rectangular and has long sides arranged in the Z direction and short sides arranged in the Y direction. The outer shape of the lens 31a of the first lens plate 31 is a proportionally reduced shape of the incident illumination area of the light valves 60B, 60G, and 60R.

The second lens plate 32 has lenses 32a arranged in a matrix on a plane parallel to the YZ plane. The outer shape of each lens 32a is rectangular, with long sides arranged in the Z direction and short sides arranged in the Y direction. The lenses 31a and the lenses 32a face each other on the X axis.

The polarization converter 40 is arranged near the exit surface of the lens 32a. The polarization conversion section 40 is arranged in parallel with the Y axis having an inclination of about 45 degrees with respect to the incident optical axis L, and the polarization conversion section 40P and the reflection section 40R each have a strip shape.
And a half-wave phase plate 42 arranged in parallel with the Y-axis.

The incident surface on the prism member 41 is the lens 32.
The polarization separation unit 40 is arranged at a position corresponding to the center of a.
P is arranged so as to have an incident angle of 45 degrees with respect to the incident optical axis L.

The adjacent reflecting portion 40R is the polarized light separating portion 40P.
Are placed in parallel with. The polarization splitting section 40P faces the center of the lens 32a, and the reflecting section 4 is provided at the boundary position of the lens 32a.
0R faces.

Next, the operation of the projection type display device according to the above embodiment will be described.

The light source light, which is a substantially parallel light flux emitted from the light source 20 in the X-axis direction, is incident on the first lens plate 31, and is divided into a plurality of secondary light fluxes divided by the openings defined by the outer shapes of the individual lenses 31a. Will be divided.

The secondary light flux split by the first lens plate 31 is condensed, and light source images LI are formed as bright spots on the lenses 32a of the second lens plate 32, respectively. The light source image LI has an inclination that depends on the position of the lens 32a (see FIG. 6).

The polarization conversion section 40 arranged on the exit surface of the lens 32a has a light source image LI of the lens 32a of the second lens plate 32.
The light emitted in the X-axis direction is converted into a single polarized light.

The light emitted from the light source image LI on the lens 32a in the X direction enters from the incident surface of the prism member 41, is reflected by the polarization splitting portion 40P, and is adjacent to the reflecting portion 40.
The S-polarized light having a vibration direction in the Y direction incident on R (referred to as a first polarization) and the P-polarized light having a vibration direction in the Z direction transmitted through the polarization separation unit (referred to as a second polarization) are polarized and separated. .

The S-polarized light (first polarized light) is reflected by the reflector 40R, is reflected in the same direction as the P-polarized light, and is emitted from the prism member 41. S-polarized (first polarized) prism member 41
Since the ½ wavelength phase plate 32 is disposed on the exit surface of S, the S polarized light (first polarized light) is converted into P polarized light (second polarized light).

On the other hand, the P-polarized light (second polarized light) transmitted through the polarized light separating section 40P is emitted from the emission surface of the prism member 41.

The second polarized light having a vibration direction in the Z direction passes through the condenser lens 50 and crosses mutually orthogonal blue (B) light reflecting dichroic mirrors 72B constituting the color separation optical system 70, and red (R) light and green. (G) The light is incident on the light reflection dichroic mirror (72RG) and is color-separated into B light traveling in the −Y direction and mixed light of R light and G light traveling in the Y direction. Color-separated B light is bending mirror 72B
And travels in the X direction and enters the polarization beam splitter 76B.

The mixed light of R light and G light is bent by the bending mirror 72.
Color separation into G light that travels in the X direction via RG, is reflected by a G light reflection dichroic mirror 73 that is arranged perpendicular to the XY plane, and travels in the -Y direction, and R light that travels in the X direction as it is. To be done. The G light is incident on the polarization beam splitter 76G, and the R light is incident on the polarization beam splitter 76R.

The color-separated B light, G light, and R light have no change in polarization direction after being emitted from the polarization conversion unit 40.
The second polarized light having the vibration direction in the Z direction, and the polarized light having the vibration direction in the Z direction is the polarization beam splitter 76 of FIG.
It has a vibration direction in the S direction that is reflected by the polarization separating units B, 76G, and 76R.

As a result, the B light, G light, and R light reflected by the polarization splitting section and emitted from the polarization beam splitters 76B, 76G, and 76R are respectively directed to the light valves 60B, 60G, and 60R perpendicular to the XY plane. Incident.

The light reflected by the light valves 60B, 60G, and 60R is polarized beam splitters 76B, 76G, and 7B.
6R, respectively, and only the first polarized light is extracted as transmitted light (analyzed), enters the cross dichroic prism 77 from a different incident surface for each color, performs color combination, and then enters the projection lens 90. It is incident.

The combined light emitted from the projection lens 90 is projected as a full-color image on the screen 5 through the bending mirror 95. The projected image on the screen 5 is the light valve 60.
B, 60G, 60R and the projection lens 90 have a conjugate relationship, and in this embodiment, the projection image on the screen 5 has light valves 60B, 6 having a longitudinal direction in the X direction.
It is a proportionally enlarged rectangle of 0G and 60R.

Next, the first lens plate 31 and the second lens plate 3
2 and the light valves 60B and 60G of the polarization converter 40,
The effect related to the illumination of 60R will be described.

FIG. 7A is an enlarged side view of the polarization conversion section, and FIG. 7B is a view as seen from the arrow B of FIG. 7A.

The length direction of the light source image formed on the lens 32a of the second lens plate 32 differs depending on the position of the lens 32a as shown in FIG.

Polarization splitting section 40P and reflecting section 40R and 1/2
The longitudinal direction of the wavelength phase plate 42 is orthogonal to the long side direction of the rectangle of the second lens plate 32a.

At this time, since the width of the half-wave phase plate 42 and the width of the incident surface of the polarization splitting portion 40P are each half of the long side of the rectangular lens 32a, the light source image LI. Even if the light is tilted, most of the light is separated by the polarization splitting unit 4.
The light can be directly incident on 0P, and the direct incidence on the reflecting portion 40R can be eliminated.

As a result, almost all the light emitted from the light source image LI on the lens 32a becomes the light incident on the polarization separation section 40P.

The incident light is polarized and separated by the polarized light separating portion 40P into S-polarized light (first polarized light) which is reflected and polarized, and P-polarized light (second polarized light) which is transmitted. S-polarized (first
The polarized light enters the adjacent reflection section 40R and is reflected, and is converted into P-polarized light (second polarized light) by the ½ wavelength plate 42 arranged on the exit surface to become P-polarized light (second polarized light). The polarization converter 40 is emitted.

Since the light emitted from the polarization conversion section 40 does not contain polarized light having a vibration direction other than the first polarized light,
The light incident on the polarization beam splitters 76R, 76G, and 76B is not discarded as transmitted light, and most of the light is reflected by the polarization splitting unit and the light valve 60.
It is incident on B, 60G, and 60R.

As described above, this embodiment has the effect of achieving high-luminance illumination of the light valves 60B, 60G, and 60R as compared with the conventional example.

According to the first embodiment, the amount of light incident on the light valves 60B, 60G, 60R is increased, and high brightness illumination can be achieved for the light valves 60B, 60G, 60R. Therefore, the light valves 60B, 60G, The light emitted from 60R can be analyzed to increase the brightness of the projected image on which the detected light is projected.

FIG. 8 is an enlarged cross-sectional view of the polarization converter of the projection type display device according to the modification of the first embodiment. The parts common to those of the first embodiment are designated by the same reference numerals and their description is omitted. Omit it.

FIG. 8 is a view corresponding to FIG. 5 of the first embodiment.

In the first embodiment, the polarization splitting section 40P and the reflection section 40R which constitute the polarization conversion section 40 are all arranged in parallel, but in this modification, the polarization splitting section is provided at the center of the polarization conversion section 140. Without arranging, the polarization splitting portion 140P and the reflecting portion 140R are arranged so as to be orthogonal to each other on both sides of the optical axis.

The polarization conversion section 140 has an inclination of 45 degrees with respect to the optical axis L, and the length direction of the belt shape is the lens 32.
It has a polarization splitting portion 140P arranged parallel to the Y-axis direction perpendicular to the longitudinal direction of a and a strip-shaped reflecting portion 140R arranged parallel to this polarization splitting portion 140P. In FIG. 8, the polarization splitting portion 140P and the reflecting portion 140R in the Z direction from the optical axis L are shown.
Is orthogonal to the polarization splitting portion 140P and the reflecting portion 140R in the −Z direction from the optical axis.

Incident light from the light source image of the second lens plate 32 to the polarization splitting portion 40P is split into reflected S-polarized light (first polarized light) and transmitted P-polarized light (second polarized light).

The S-polarized light (first polarized light) is adjacent to the reflecting portion 14.
X is the same as P-polarized light (second polarized light) after being incident on 0R and reflected.
Direction, and is converted into P-polarized light (second polarized light) by the band-shaped half-wave plate 142 having a length in the Y direction arranged on the exit surface.

In this way, the P-polarized light (second polarized light) is emitted from the polarization conversion unit 140.

A glass rod 145, for example, is arranged in the center of the polarization conversion section 140 instead of the polarization separation section or the reflection section. It is not necessary to arrange anything in the central portion of the polarization conversion unit 140.

According to this modification, almost all the light emitted from the light source image on the second lens plate 32 is the polarization splitting unit 1.
It becomes the light incident on 40P and is effectively a single polarization (second polarization).
It is possible to form the polarization conversion section 140 that has the same effect as that of the first embodiment.

FIG. 9 is a diagram showing a basic structure of a projection type display device according to a second embodiment of the present invention, FIG. 10 is a perspective view of the projection type display device, and FIG. 11 is an enlarged side view of a polarization conversion section.
The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The polarization conversion section 240 has strip-like polarization splitting sections 240P having a longitudinal direction in the Y-axis direction having an inclination of about 45 degrees with respect to the incident optical axis L and strip-like reflecting sections 240R alternately and parallel to each other. Arranged composite prism member 24
1 and a half-wave phase plate 2 having a longitudinal direction in the Y-axis direction
And 42.

The band-shaped half-wave phase plate 242 is arranged on the exit surface of the P-polarized light (second polarized light) which is the transmitted light of the polarization splitting portion 240P so that the longitudinal direction is orthogonal to the XY plane.

With this structure, the P-polarized light (second polarized light) is placed on the exit surface of the prism member 241.
The S-polarized light (first polarized light) that has been converted to S-polarized light (first polarized light) by the / 2 wavelength phase plate 242 and reflected by the polarization splitting portion 240P is reflected by the adjacent reflecting portion 240R and emitted as it is.

As a result, highly polarized single polarized light can be emitted from the polarization converter 240.

The color separation / synthesis optical system 270 includes the prism 27.
1, 272, 273. The surface 271b of the prism 271 and the prism 27 which are arranged perpendicular to the XY plane.
The second surface 272a is opposed to the second surface 272a with a gap, and the surface 27
A B-light reflecting dichroic film DB is formed on 1b.

The surface 272b of the prism 272 and the surface 273a of the prism 273 arranged perpendicularly to the XY plane are fixed by an adhesive. An R light reflection dichroic film DR is formed on the joint surface 272b of the prism 272.

Light valves 260B, 260R, 260
The incident surface of G has a rectangular shape that is a proportionally enlarged shape of the outer shape of the first lens plate 31. Light valve 260B, 260R,
260G is perpendicular to the XY plane, and the long side direction of the incident surface of the incident light is orthogonal to the XY plane.

The S-polarized light (first polarized light) emitted from the polarization converter 240 has a vibration direction parallel to the Y-axis direction parallel to the paper surface, and enters the polarization beam splitter 276 via the condenser lens 50.

The polarization splitting portion 276a of the polarization beam splitter 276 has an angle of 45 degrees with respect to the incident axis, and
Since it is arranged perpendicularly to the paper surface (X-Y plane), the incident first polarized light is the P-direction polarized light that is transmitted to the polarized light separating portion 276a, and is transmitted through the polarized light separating portion 276a to generate the color. It is emitted to the disassembly / combination optical system 270.

The light incident on the prism 271 is reflected on the surface 271.
The B light reflected by the B light reflecting dichroic film DB formed on the surface b, totally reflected by the surface 271a, and emitted from the surface 271c, and the B light transmitted through the surface 271b and the surface 27 of the prism 272.
Color separation is performed on the mixed light of R light and G light incident from the surface 2a.

The mixed light incident on the prism 272 is color-separated into R light reflected by the R light reflecting dichroic film DR formed on the joint surface 272b and G light incident on the prism 273. The R light is totally reflected by the surface 272a,
It is injected from 2c. The G light propagates after being totally reflected by the surface 273b and emitted from the surface 273c.

B light emitted from the color separation / combination optical system 270,
The R light and the G light are reflected light valves 260B, 260R, 2 arranged near the surfaces 271c, 272c, 273c.
It is incident on 60 G, respectively.

Light valves 260B, 260R, 260
The respective color lights that have undergone the modulation effect by G and exit, travel in the direction opposite to the incident optical axis, undergo color combination by the color separation / combination optical system 270, and enter the polarization beam splitter 276 again.

In the polarization beam splitter 276, the modulated light (the first polarized light, which has the oscillation direction of the S direction which is reflected by the polarization separation portion 276a of the polarization beam splitter 276) is detected as reflected light and extracted. , And enters the projection lens 290. The projection lens 290 projects the reflected light on the screen 5.

Also in the projection type display device of the second embodiment, the light source image formed on the lens 32a of the second lens plate 32 is the same as that shown in FIGS. 6 and 7 (b). Almost all the emitted light is the polarization splitting unit 240P.
Becomes light that is incident on the laser beam and is effectively converted into a single polarized light (second polarized light).

According to the second embodiment, it is possible to provide the projection type display device which has the same effect as that of the first embodiment.

The polarization converter 40 shown in FIG. 8 can be similarly used in this embodiment. However, in that case, the half-wave plate 242 is arranged on the emission surface of the light that passes through the polarization splitting portion 240P.

FIG. 12 is a diagram showing the basic structure of a projection type display device according to the third embodiment of the present invention, and FIG. 13 is a perspective view of the projection type display device. Are assigned the same reference numerals and explanations thereof are omitted.

This projection type display device includes an illumination device 10, a condenser lens 50, a color separation optical system 370, a polarization beam splitter 376, a light valve 360, and a projection lens 39.
It has 0 and.

The polarization beam splitter 376 has an incident angle of 45 degrees with respect to the incident optical axis, and has a polarization separating section 376a which is arranged perpendicularly to the XY plane (parallel to the Z axis).

The illumination area on which the incident light of the light valve 360 is incident is rectangular, and the direction of its long side is orthogonal to the XY plane.

The color separation optical system 370 has an axis O'parallel to the X axis.
It is a circular plate that rotates around the
Light transmission, B light transmission filter 370R, 370G, 37
0B is provided in the range of 120 °. By rotating the color separation optical system 370, the R light, the G light, and the B light that are divided in time series are emitted from the color separation optical system 370.

The polarized light emitted from the illuminating device 10 is P polarized light (second polarized light) whose vibration direction is parallel to the Z axis, and is a condenser lens arranged near the exit surface of the polarization conversion unit 40. 50 through the color separation optical system 370 (R light transmission, G light transmission, B light transmission filters 370R, 370
G, 370B).

The respective color lights emitted from the color separation optical system 370 enter the polarization beam splitter 376. Each incident color light is Z
Since it is the second polarized light having the vibration direction in the axial direction, it becomes the vibration direction of the S direction which is reflected by the polarization separation section 376a, is reflected by the polarization separation section 376a and exits the polarization beam splitter 376, and is near the exit surface. It is incident on the arranged light valve 360.

R incident on the light valve 360 in time series
The light, the G light, and the B light are each subjected to a modulation action by the color signal of each color light, and the first polarized light that is the modulated light and the second polarized light that is the non-modulated light.
The polarized beam splitter 3 emits the mixed light of polarized light.
It re-enters 76.

In the polarization beam splitter 376, only the modulated light (first polarized light) is taken out (detected) as transmitted light,
The projection lens 390 is made to enter the projection lens 390 in time series and projected on the clean 5.

Also in the projection type display device of the third embodiment, the light source image formed on the lens 32a of the second lens plate 32 is the same as that shown in FIGS. 6 and 7 (b). Almost all the emitted light becomes light that enters the polarization splitting unit 40P, and is effectively converted into a single polarized light (second polarized light).

According to the third embodiment, it is possible to provide a projection type display device that achieves the same effects as those of the first and second embodiments.

The configuration of this embodiment can be similarly applied to the polarization splitting section shown in FIG.

[0117]

As described above, according to the projection type display device of the present invention, it is possible to increase the amount of light incident on the light valve and achieve high brightness of the projected image.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of a projection type display device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a projection type display device.

FIG. 3 is a diagram showing a relationship between a reference plane and a screen.

FIG. 4 is an enlarged exploded perspective view of a lighting device.

FIG. 5 is an enlarged view of a polarization conversion unit.

FIG. 6 is a diagram showing a light source image formed on a second lens plate.

7 (a) is an enlarged side view of the polarization converter, FIG.
7B is a view as seen from the arrow B of FIG. 7A.

FIG. 8 is an enlarged cross-sectional view of a polarization conversion unit of the projection type display device according to the modification of the first embodiment.

FIG. 9 is a diagram showing a basic configuration of a projection type display device according to a second embodiment of the present invention.

FIG. 10 is a perspective view of a projection type display device.

FIG. 11 is an enlarged side view of the polarization conversion unit.

FIG. 12 is a diagram showing a basic configuration of a projection type display device according to a third embodiment of the invention.

FIG. 13 is a perspective view of a projection type display device.

FIG. 14 is a diagram showing a basic configuration of a conventional projection display device.

15A is an enlarged side view of the polarization conversion unit, and FIG. 15B is a view on arrow A of FIG. 15A.

[Explanation of symbols]

20 Light Source 31 First Lens Plate 31a Lens 32 Second Lens Plate 32a Lens 40, 140, 240 Polarization Converter 40P, 140P, 240P Polarization Splitter 40R, 140R, 240R Reflector 42, 142, 242 1/2 Wave Phase Plate 76B, 76R, 76G, 276, 376 Polarizing beam splitters 60B, 60R, 60G, 260B, 260R, 260
G, 360 Light valve 90, 290, 390 Projection lens 370 Color separation optical system

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 21/10 G03B 21/10 Z 21/14 21/14 AF term (reference) 2H042 CA07 CA10 CA14 CA17 2H049 BA05 BA06 BB03 BC14 BC22 2H099 AA11 BA09 BA17 CA02 CA08 CA11

Claims (3)

[Claims] 1. A light source, a first lens plate in which a plurality of lenses having a rectangular outer shape are arranged in rows and columns, which splits the light beam into a plurality of light fluxes, and a plurality of the lens plates divided by the first lens plate. A second lens plate, in which a plurality of lenses having a rectangular outer shape are arranged in a matrix, into which the light flux of, and a second polarized light that is incident and reflects the light flux from the second lens plate. A strip-shaped polarization splitting unit that splits the polarized light, and a strip-shaped reflecting unit that is arranged in parallel with the polarization splitting unit that reflects the first polarized light reflected by the polarized light splitting unit and emits it in the same direction as the second polarized light. A strip-shaped half-wave phase plate that is arranged in correspondence with either the first polarized light emitting portion or the second polarized light emitting portion,
A polarization conversion unit that converts a plurality of light beams emitted from the lens plate into a single polarization; a light valve having a rectangular light incident surface that modulates the light emitted from the polarization conversion unit by incidence; and the light valve is emitted. An optical system for extracting modulated light from the converted light, a projection lens for projecting the modulated light extracted by the optical system, the first lens plate, the second lens plate, the polarization conversion unit, and the light In a projection type display device including a valve, the light analysis optical system, and a reference plane on which the projection lens is arranged, the light analysis optical system includes a polarization beam splitter having a polarization separation unit arranged perpendicularly to the reference plane. A long side of the light incident surface of the light valve is arranged perpendicular to the reference plane, the polarization splitting unit, the reflecting unit, and the half wavelength of the polarization converting unit. The projection type display device, wherein the longitudinal direction of the phase plate is orthogonal to the long side direction of the lenses forming the second lens plate. 2. A light source, a first lens plate in which a plurality of lenses having a rectangular outer shape are arranged in a matrix, the light source light entering the light beam and dividing the light beam into a plurality of light beams, and a plurality of the first lens plates divided by the first lens plate. A second lens plate, in which a plurality of lenses having a rectangular outer shape are arranged in a matrix, into which the light flux of, and a second polarized light that is incident and reflects the light flux from the second lens plate. A strip-shaped polarization splitting unit that splits the polarized light, and a strip-shaped reflecting unit that is arranged in parallel with the polarization splitting unit that reflects the first polarized light reflected by the polarized light splitting unit and emits it in the same direction as the second polarized light. A strip-shaped half-wave phase plate that is arranged in correspondence with either the first polarized light emitting portion or the second polarized light emitting portion,
A polarization conversion unit that converts a plurality of light beams emitted from the lens plate into a single polarization, and a color separation optical system that separates the light emitted from the polarization conversion unit into a plurality of color lights of red light, green light, and blue light, A light valve having a rectangular light incident surface, which is arranged for each of the color lights and which receives and modulates each color light by the color separation optical system; and an analysis optical system which extracts modulated light from the light emitted from the light valve. A color synthesizing optical system for color synthesizing the modulated light extracted by the analyzing optical system, a projection lens for projecting the synthetic light color-synthesized by the synthesizing optical system, the first lens plate, the second lens In the projection type display device including a plate, the polarization conversion unit, the color separation optical system, the light valve, the analysis optical system, the color combining optical system, and a reference plane on which the projection lens is arranged, Optical system has multiple dikes A loic film, the plurality of dichroic films are arranged respectively perpendicular to the reference plane, the long side of the light incident surface of each light valve is arranged perpendicular to the reference plane, the polarization conversion unit of the A projection type display device, wherein a longitudinal direction of the polarized light separating portion, the reflecting portion and the half-wave phase plate is orthogonal to a long side direction of the lens forming the second lens plate. 3. A light source, a first lens plate in which a plurality of lenses each having a rectangular outer shape are arranged in a matrix, the light source light being incident to divide the light beam into a plurality of light beams, and a plurality of the first lens plates divided by the first lens plate. A second lens plate, in which a plurality of lenses having a rectangular outer shape are arranged in a matrix, into which the light flux of, and a second polarized light that is incident and reflects the light flux from the second lens plate. A strip-shaped polarization splitting unit that splits the polarized light, and a strip-shaped reflecting unit that is arranged in parallel with the polarization splitting unit that reflects the first polarized light reflected by the polarized light splitting unit and emits it in the same direction as the second polarized light. A strip-shaped half-wave phase plate that is arranged in correspondence with either the first polarized light emitting portion or the second polarized light emitting portion,
A polarization conversion unit that converts a plurality of light beams emitted from the lens plate into a single polarization, a polarization separation optical system that receives the light emitted from the polarization conversion unit, and performs polarization separation, and light that exits the polarization separation optical system. A red light, a green light, a color separation optical system for color separation into blue light, and arranged for each of the color lights, to enter and modulate each color light by the color separation optical system, a light valve having a rectangular light incident surface and A color synthesizing optical system for color synthesizing the light emitted from the light valve, an analyzing optical system for extracting modulated light from the synthetic light color-synthesized by the synthesizing optical system, and a light synthesizing optical system for extracting the modulated light. A projection lens for projecting modulated light; the first lens plate, the second lens plate, the polarization conversion unit, the polarization separation optical system, the color separation optical system, the light valve, the color combination optical system, and the inspection lens. Optical optical system and the projection lens In a projection type display device having a reference plane on which a lens is arranged, the polarization separation optical system and the analysis optical system are a single polarization beam splitter having a polarization separation unit arranged perpendicular to the reference plane. A long side of the light incident surface of each of the light valves is arranged perpendicularly to the reference plane, and the color separation optical system and the combining optical system are arranged in common and arranged in a plurality. The dichroic film, the longitudinal direction of the polarization splitting section of the polarization converting section, the reflecting section, and the half-wave phase plate is orthogonal to the long side direction of the lens forming the second lens plate. A projection type display device characterized in that